WO2006054585A1

WO2006054585A1 - Touch panel display and touch panel

Info

Publication number: WO2006054585A1
Application number: PCT/JP2005/021019
Authority: WO
Inventors: Masafumi Kokura; Shinya Tanaka; Yoshiharu Kataoka
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2004-11-17
Filing date: 2005-11-16
Publication date: 2006-05-26
Also published as: JP2008032756A

Abstract

A touch panel display for detecting a touched position by a capacitive coupling system and displaying an image comprising a first glass substrate (8) and a second glass substrate (4) arranged oppositely to each other, a liquid crystal layer (40) interposed between both glass substrates (8, 4), a plurality of pixel electrodes (7a) arranged between the liquid crystal layer (40) and the first glass substrate (8), a first transparent electrode (3) arranged between the liquid crystal layer (40) and the second glass substrate (4) and detecting a touched position, a second transparent electrode (1) provided between the first transparent electrode (3) and the liquid crystal layer (40) and being supplied with a display signal, and a color filter layer (2) interposed between the second transparent electrode (1) and the first transparent electrode (3).

Description

Specification

Touch panel display device and touch panel

Technical field

The present invention relates to a touch panel display device and a touch panel.

Background art

A touch panel is a device that inputs information interactively to an information processing device such as a computer by touching (pressing) with a finger, a pen, or the like.

[0003] Touch panels are classified into a resistive film method, a capacitive coupling method, an infrared method, an ultrasonic method, an electromagnetic induction coupling method, and the like according to the operation principle. Among them, a resistive film type and capacitive coupling type touch panel that can be mounted at low cost are often used in recent years.

[0004] The resistance film type touch panel includes, for example, a pair of glass substrates arranged to face each other, an insulating spacer sandwiched between the pair of glass substrates, and an inner side of each glass substrate. A transparent conductive film provided as a resistance film on the entire surface and a touch position detection circuit are included. The touch panel is used by being mounted on the front surface of a display screen such as a liquid crystal display device.

In the resistive film type touch panel having such a configuration, by touching the front surface of the display screen, the resistive films come into contact (short circuit), and current flows between the resistive films. The touched position is detected by detecting the change in voltage at this time by the touch position detection circuit.

[0006] However, the resistive film type touch panel has a pair of resistive films facing each other with an air layer interposed therebetween, so that the difference in refractive index between the air layers increases and the light transmittance decreases. If you do, you will have a flaw.

Next, the capacitive coupling type touch panel will be described.

FIG. 13 is a schematic cross-sectional view of a touch panel display device 150 having a general capacitive coupling type touch panel.

This touch panel display device 150 includes an active matrix substrate 120, a counter substrate 135, A liquid crystal panel composed of a liquid crystal layer 140 sandwiched between the two substrates 120 and 135, a backlight 106 provided on the lower side of the liquid crystal panel via a polarizing plate 105 and optical sheets 110, A touch panel 130 provided on the upper side of the liquid crystal panel via a polarizing plate 105 is provided.

The touch panel 130 has a position detecting transparent electrode 103 on the liquid crystal panel side, and is fixed to the liquid crystal panel by an adhesive layer 117 such as a double-sided tape.

Further, the touch panel 130 includes a third glass substrate 116, a position detection transparent electrode 103 provided on the entire surface of the third glass substrate 116, and a constant pitch on a peripheral portion of the position detection transparent electrode 103. And a position detection circuit for detecting the touch position.

[0012] In this touch panel 130, by touching the front surface of the display screen, that is, the surface of the third glass substrate 116, the position detection transparent electrode 103 is grounded via the electrostatic capacity of the human body at the touched point. Therefore, the resistance value between each position detection electrode and the ground point changes. By detecting this change by the touch position detection circuit, the touched position is detected.

[0013] In the touch panel display device 150, the number of glass substrates is one less than that of the resistive film type touch panel, and there is no air layer between the glass substrates present in the resistive film type touch panel. Therefore, the light transmittance is excellent.

[0014] Further, as an example of a capacitive coupling type touch panel, Patent Document 1 discloses a transparent adhesive on the touch surface side of a first transparent substrate provided with a transparent conductive film for touch position detection. Discloses a capacitance type touch panel in which a second transparent substrate for preventing glare is bonded together. According to this document, it is described that damage to the transparent conductive film can be prevented and productivity can be improved.

[0015] With a touch panel display device of the type that is used with the above touch panel mounted on the front surface of the display screen, however, the touch panel itself must be mounted on the front surface of the display screen. There was a problem that the thickness and weight were increased, or the cost was high.

[0016] Therefore, in order to reduce the thickness and weight of the device, a glass substrate and a touch panel are provided. In addition, it is known that the position detection transparent electrode is omitted by sharing the position detection transparent electrode with a member constituting the display device.

[0017] Specifically, in Patent Document 2, a common transparent electrode, a liquid crystal, and a display transparent electrode are sequentially stacked between two transparent insulating plates to display characters and images, and to contact a contact object such as a finger. In order to detect the position coordinates of the contact part on the transparent insulating plate arranged on the transparent electrode side, the current flowing between the contact object and the common transparent electrode through the transparent insulating plate at the four corners of the common transparent electrode The position coordinates of the contact part are determined by the current signals from the current detectors at the four corners, which are affected by the change in capacitance caused by the contact with the contact part on the transparent insulating plate. An electrostatic capacitive touch panel device having a signal processing circuit for calculating the above is described.

Similarly, Patent Document 3 discloses a transparent counter electrode in a display device including an active matrix substrate having a plurality of pixel electrodes arranged in a matrix and a transparent counter electrode facing the active matrix substrate. A liquid crystal display circuit that supplies a display voltage or current to the display, a position detection circuit that detects a current flowing through multiple points of the transparent counter electrode, and one of these circuits is electrically connected to the transparent common electrode. A touch sensor body type display device comprising a switching circuit for conducting is described.

Patent Document 1: Japanese Patent Laid-Open No. 5-324203

Patent Document 2: Japanese Patent Laid-Open No. 2003-99192

Patent Document 3: Japanese Unexamined Patent Publication No. 2003-66417

Disclosure of the invention

Problems to be solved by the invention

However, in Patent Documents 2 and 3, the thickness and cost of the device itself can be reduced by sharing the glass substrate constituting the touch panel and the position detection transparent electrode with the members constituting the display device. Although reduction is possible, there is a risk of degrading display quality.

[0020] Specifically, the common transparent electrode of Patent Documents 2 and 3 described above serves as a touch panel electrode for detecting the position and a display electrode for applying a voltage to the liquid crystal layer. It is necessary to have both functions. However, while the touch panel electrode is required to have a high electrical resistance, the display electrode has a low electrical resistance. Is required.

That is, the surface resistance is preferably about 400 to 1 600 Ω in order to function as a touch panel electrode. Moreover, in order to function as a display electrode, 30-100 ohms or less are preferable. If the surface resistance of the common transparent electrode exceeds 100 Ω, the display quality may be deteriorated due to shadowing, which causes shadows that extend along the display characters and non-turns. The surface resistance (Ω) is the electrical resistance per unit area, which is also called sheet resistance, and is expressed in units such as Ω Higuchi and Ω / sq.

[0022] The present invention has been made in view of the strong point, and an object of the present invention is to suppress deterioration of display quality and reduce the thickness of the device itself in a capacitive coupling type touch panel. There is to do.

Means for solving the problem

In the present invention, a second transparent conductive film to which a display signal is supplied and a first transparent conductive film for detecting a touched position are provided on the second substrate. is there.

Specifically, a touch panel display device according to the present invention is a touch panel display device that detects a position touched by a capacitive coupling method and displays an image, and includes a first substrate and a first substrate that are arranged to face each other. A second substrate; a display medium layer provided between the first substrate and the second substrate; a plurality of pixel electrodes disposed between the display medium layer and the first substrate; and the display medium. A first transparent conductive film disposed between the layer and the second substrate for detecting a touched position; and between the first transparent conductive film and the display medium layer, and a display signal is provided. And a second transparent conductive film to be supplied, and an insulating layer interposed between the second transparent conductive film and the first transparent conductive film.

[0025] According to the above configuration, by supplying display signals to the respective pixel electrodes provided on the first substrate and the second transparent conductive film provided on the second substrate, A voltage is applied to the display medium layer to display an image.

[0026] Further, by touching the surface of the second substrate opposite to the display medium layer, the first transparent conductive film is touched across the second substrate via the capacitance of the touched human body. For example, between each position detection electrode provided around the first conductive film and the grounding point. A change occurs in the resistance value. Then, by detecting this change using, for example, a position detection circuit, the touched position is detected, and it will function as a capacitive coupling type touch panel.

[0027] Furthermore, since the first transparent conductive film for detecting the touch position generally has a higher electrical resistance than the second transparent conductive film to which the display signal is supplied, the position detection signal is the first. The first transparent conductive film is reliably generated, and a display signal is promptly supplied to the display medium layer through the second transparent conductive film. Therefore, even if the touch panel display device of the present invention has a touch panel function, generation of shadowing is suppressed and display quality is prevented from being deteriorated.

[0028] Conventionally, a touch panel on which a first transparent conductive film for detecting the touch position is formed is mounted on the front surface of the display screen of the display device, and three substrates are used as a display device having a touch panel function. Whereas the touch panel display device of the present invention is composed of two substrates and one substrate can be omitted, the device itself can be made thin and lightweight. Become.

Due to the above, in the capacitive coupling type touch panel, it is possible to suppress display quality deterioration and to make the device itself thin and light.

[0030] The surface resistance of the first transparent conductive film may be 400 Ω or more and 1600 Ω or less.

[0031] According to the above configuration, it is possible to reliably generate a position detection signal in the first transparent conductive film and reliably transmit the position detection signal to, for example, the position detection circuit. become. On the other hand, if the sheet resistance of the first transparent conductive film is less than Ω, or exceeds 1600 Ω, it is difficult to accurately detect the touched position.

[0032] The insulating layer may be a color filter layer! /.

[0033] According to the above configuration, the first transparent conductive film and the second transparent conductive film are electrically insulated by one color filter layer. Therefore, in the case of a color display device, the first transparent conductive film This makes it possible to simplify the manufacturing process without requiring a separate insulating layer between the film and the second transparent conductive film insulating layer.

[0034] One color filter layer may be provided between the second substrate and the first transparent conductive film. [0035] According to the above configuration, for example, the first transparent conductive film, the insulating layer, and the second transparent conductive film are sequentially formed on a general color filter substrate in which one color filter layer is formed on a glass substrate. In this way, since the configuration on the second substrate of the present invention can be realized, the effects of the present invention can be achieved using a general commercially available color filter substrate.

[0036] The thickness of the first transparent conductive film may be 50 A or more and 150 A or less.

[0037] According to the above configuration, it is possible to reliably generate a position detection signal in the first transparent conductive film, and to reliably transmit the position detection signal to, for example, a position detection circuit. . On the other hand, when the thickness of the first transparent conductive film is less than 50 A, the electric resistance of the first transparent conductive film becomes too high, and the resistance value is not stable within the substrate surface and is touched. It is difficult to detect the position accurately. In addition, if the thickness of the first transparent conductive film exceeds 150A, the transmittance of the first transparent conductive film is greatly reduced, and the display quality is impaired.

[0038] The first transparent conductive film may be formed of an amorphous compound of indium oxide and tin oxide or a compound of indium oxide and zinc oxide.

[0039] According to the above configuration, the amorphous compound of indium oxide and tin oxide, or the compound of indium oxide and zinc oxide is more than the compound of polycrystalline indium oxide and tin oxide. In the general case where the second transparent conductive film to which a display signal is supplied is formed of a compound of polycrystalline indium oxide and tin oxide, the contact position is The first transparent conductive film for detecting the electric resistance becomes electrically higher than the second transparent conductive film.

[0040] Further, the touch panel display device according to the present invention is a touch panel display device that detects the position touched by the capacitive coupling method and displays an image, and is used for a pair of display panels arranged to face each other. A display panel for displaying an image, a pair of switching panel substrates disposed opposite to the display panel, and a display medium layer provided between the substrate and the pair of display panel substrates; A switching panel for switching a display state of an image including a liquid crystal layer provided between the pair of switching panel substrates, and the substrate on the side farther from the display panel cover among the pair of switching panel substrates A transparent conductive film for detecting the touched position Is provided.

[0041] According to the above configuration, an image is displayed on the display panel. In addition, by touching the surface of the switching panel substrate far from the display panel, the transparent conductive film is grounded via the capacitance of the touched human body at the position touched across the switching panel substrate. For example, the resistance value between each position detection electrode provided around the first conductive film and the contact point changes. Then, by detecting this change by, for example, a position detection circuit, the touched position is detected and functions as a capacitive coupling type touch panel.

[0042] Further, since the transparent conductive film for detecting the touch position has a higher electrical resistance than a general transparent conductive film to which a display signal is supplied from the display panel, the position detection signal is transparent. In addition to being reliably generated in the conductive film, a display signal is promptly supplied to the display medium layer in the display panel. Therefore, even if the touch panel display device of the present invention has a touch panel function, generation of shadowing is suppressed and display quality is prevented from being deteriorated.

[0043] Conventionally, a touch panel on which a transparent conductive film for detecting the touch position is formed is mounted on the front surface of the display screen of the display device, so that five display devices having a touch panel function and a display switching function are provided. Whereas the touch panel display device of the present invention is composed of four substrates and one substrate can be omitted, the device itself must be thin and light. It becomes possible.

[0044] As described above, in the capacitive coupling type touch panel, it is possible to suppress deterioration of display quality and to make the device itself thin and light.

[0045] Further, the touch panel according to the present invention is a touch panel for detecting a position touched by a capacitive coupling method, and is provided on the substrate and a first touch panel for detecting the touched position. 1 a transparent conductive film, an insulating layer covering the first transparent conductive film, and a second transparent conductive film provided so as to cover the insulating layer and supplied with a display signal. To do.

[0046] According to the above configuration, by supplying a display signal to the second transparent conductive film provided on the substrate, for example, a display medium layer sandwiched between the substrate and another substrate. To voltage Is applied and an image is displayed.

[0047] Further, by touching the substrate, the first transparent conductive film is grounded via the capacitance of the touched human body at the position touched across the substrate, for example, around the first conductive film. There is a change in the resistance value between each position detection electrode and the ground point. Then, by detecting this change using, for example, a position detection circuit, the touched position is detected, and it functions as a capacitive coupling type touch panel.

[0048] Furthermore, since the first transparent conductive film for detecting the touch position generally has a higher electrical resistance than the second transparent conductive film to which a display signal is supplied, the position detection signal is the first. It is reliably generated in the transparent conductive film, and a display signal is promptly supplied to the second transparent conductive film. Therefore, even if the touch panel of the present invention has a touch panel function, the occurrence of shadowing is suppressed and the deterioration of display quality is suppressed.

[0049] Conventionally, a touch panel on which a first transparent conductive film for detecting a touch position is formed is attached to the front surface of the display screen of the display device, and three substrates are used as a display device having a touch panel function. In contrast to the need, the touch panel of the present invention is composed of one of a pair of substrates constituting a display device, and one substrate can be omitted, so that the device itself is thin and lightweight. Is possible.

[0050] As described above, in the capacitively coupled touch panel, the display quality is prevented from deteriorating and the device itself can be made thin and light.

The invention's effect

[0051] The touch panel display device of the present invention is a touch panel display device that detects the position touched by the capacitive coupling method and displays an image. The second touch panel display device supplies a display signal to the second substrate. Since the transparent conductive film and the first transparent conductive film for detecting the touched position are respectively provided, it is possible to suppress deterioration of display quality and to make the device itself thin and light. .

Brief Description of Drawings

FIG. 1 is a schematic cross-sectional view of a touch panel display device 50a according to Embodiment 1 of the present invention.

[Fig. 2] Fig. 2 is a diagram showing a structure of a touch panel display device 50a according to Embodiment 1 of the present invention. FIG. 6 is a schematic plan view partially showing the H panel 30a.

FIG. 3 is a schematic sectional view taken along the line III-III in FIG.

FIG. 4 is a schematic plan view showing position detection electrodes A, B, C, and D of the touch panel 30a constituting the touch panel display device 50a according to Embodiment 1 of the present invention.

FIG. 5 is a schematic diagram for explaining the operating principle of a capacitive coupling type touch sensor.

FIG. 6 is a schematic diagram for explaining the operating principle of the touch panel display device 50a according to Embodiment 1 of the present invention.

FIG. 7 is a schematic cross-sectional view of a touch panel 30b constituting the touch panel display device according to Embodiment 1 of the present invention.

FIG. 8 is a schematic cross-sectional view of a touch panel display device 50c according to Embodiment 2 of the present invention.

FIG. 9 is a schematic cross-sectional view of a touch panel display device 50d according to Embodiment 3 of the present invention.

FIG. 10 is a schematic cross-sectional view of a touch panel 30e constituting a touch panel display device according to Embodiment 4 of the present invention.

FIG. 11 is a schematic cross-sectional view of a touch panel display device 50f according to Embodiment 5 of the present invention.

FIG. 12 is a schematic cross-sectional view of a touch panel 30g constituting a touch panel display device according to Embodiment 5 of the present invention.

FIG. 13 is a schematic cross-sectional view of a conventional touch panel display device 150.

Explanation of symbols

1 Second transparent electrode (second transparent conductive film)

2 Color Fino Letter Layer

3 First transparent electrode (first transparent conductive film)

4 Second glass substrate (second substrate)

7a Pixel electrode

8 First glass substrate (first substrate) 14 Insulating layer

19a Driving board (Switching panel board)

19b Counter substrate (substrate for switching panel)

20a Active matrix substrate (Display panel substrate)

30a, 30b, 30c, 30d Tacchinnel

30f, 30g touch panel (switching panel)

35 Color filter substrate (Display panel substrate)

40 Liquid crystal layer (display medium layer)

41 Liquid crystal layer

45 LCD panel

50a, 50c, 50d, 50f Tacchinnel display device

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, an active matrix driving type liquid crystal display device using TFT as a switching element will be described as an example. However, the present invention is not limited to the following embodiments, and may have other configurations.

[Embodiment 1 of the Invention]

The touch panel display device according to Embodiment 1 of the present invention will be described below.

FIG. 1 is a schematic cross-sectional view of a touch panel display device 50a according to Embodiment 1 of the present invention. FIG. 2 is a schematic plan view partially showing the touch panel 30a constituting the touch panel display device 50a. FIG. 3 is a schematic cross-sectional view taken along the III-III section in FIG.

The touch panel display device 50a is an active matrix substrate 20, a touch panel 30a disposed opposite to the active matrix substrate 20, and the active matrix substrate 20 and the touch panel 30a. The touch panel display device 50a is a display medium layer. A liquid layer 40; a backlight 6 provided on the lower side of the active matrix substrate 20 via the polarizing plate 5 and the optical sheet 10; and a polarizing plate 5 provided on the upper side of the touch panel 30a. The

The active matrix substrate 20 includes a first glass substrate 8 that is a first substrate, and a TFT array layer 7. [0059] The TFT array layer 7 includes a plurality of gate lines provided to extend in parallel to each other, a plurality of source lines provided to extend in parallel to each other in a direction orthogonal to the gate lines, Capacitance lines provided between the gate lines so as to extend in parallel with the gate lines, TFTs provided at the intersections of the gate lines and the source lines, and a pair of adjacent gate lines corresponding to the respective TFTs And a pixel electrode 7a which is provided in a display region surrounded by a pair of adjacent source lines and which constitutes a pixel.

The active matrix substrate 20 has a multilayer laminated structure in which a gate insulating film and an interlayer insulating film are sequentially laminated on the first glass substrate 8.

A gate line and a capacitor line are provided between the first glass substrate 8 and the gate insulating film. This gate line has a gate electrode projecting in the direction in which the source line extends corresponding to each TFT.

[0062] A semiconductor layer constituting the TFT is provided between the gate insulating film and the interlayer insulating film, and the source line force and the gate line corresponding to each TFT are provided above the semiconductor layer. A source electrode protruding in the extending direction of the electrode and a drain electrode facing the source electrode are provided.

[0063] A pixel electrode 7a connected to the drain electrode through a contact hole is provided above the interlayer insulating film, and an alignment film is provided above the pixel electrode 7a.

[0064] The drain electrode is extended to a region where the capacitance line is arranged, and the portion facing the capacitance line is an auxiliary capacitance electrode. The auxiliary capacitor electrode forms an auxiliary capacitor together with the capacitor line via the gate insulating film.

[0065] The touch panel 30a includes a second glass substrate 4 that is a second substrate, and a first transparent electrode that is provided on the second glass substrate 4 and that is a first transparent conductive film for detecting the touched position. 3, a color filter layer 2 that covers the first transparent electrode 3 and functions as an insulating layer, and a second transparent conductive film that is provided so as to cover the color filter layer 2 and is supplied with a display signal. And a second transparent electrode 1.

[0066] The surface resistance of the first transparent electrode 3 is 400 to 1600 Ω in order to sufficiently function as a touch panel, and the surface resistance of the second transparent electrode 1 is 30 to 100 Ω in order to maintain display quality. It has become.

Here, since the surface resistance of the first transparent electrode 3 is not less than 400 Ω and not more than 1600 Ω, a position detection signal is reliably generated in the first transparent electrode 3, and the position detection The signal can be reliably transmitted to the position detection circuit. On the other hand, if the surface resistance of the first transparent electrode 3 is less than ΩΩ, or exceeds 1600 Ω, it is difficult to accurately detect the touched position.

As shown in FIG. 4, the first transparent electrode 3 is provided with position detection electrodes A, B, C, and D that are electrically connected to each corner of the peripheral edge thereof.

[0069] The second glass substrate 4 includes a position detection wiring portion 11 in which each of the position detection electrodes A, B, C, and D forces also extends, and a position detection wiring terminal that is an end of the position detection wiring portion 11. Part 13 and a frame part 12 provided so as to cover the peripheral edge of the first transparent electrode 3.

[0070] The color filter layer 2 includes a coloring layer 2a in which one of red, green, and blue is disposed corresponding to each pixel, and a black matrix 2b provided between the coloring layers 2a. I have.

[0071] The liquid crystal layer 40 is made of a nematic liquid crystal material having liquid crystal molecular force having electro-optical characteristics.

In this touch panel display device 50a, one pixel is formed for each pixel electrode 7a. In each pixel, when the gate signal is sent to the gate line force to turn on the TFT, the source line is turned on. A source signal is sent from the pixel electrode and a predetermined charge is written to the pixel electrode 7a via the source electrode and the drain electrode, and a potential difference is generated between the pixel electrode 7a and the second transparent electrode 1, A predetermined voltage is applied to the liquid crystal capacitor and the auxiliary capacitor composed of the liquid crystal layer 40. In the touch panel display device 50a, an image is displayed by adjusting the transmittance of light incident from the backlight 6 by utilizing the change in the alignment state of the liquid crystal molecules according to the magnitude of the applied voltage. Is done.

Next, the operation of the touch panel display device 50a as a touch panel will be described.

[0074] When the surface of the touch panel 30a, that is, the surface of the polarizing plate 5 is touched with a pen or a finger, the first transparent electrode 3 is capacitively coupled to the ground (grounding surface) through a person. This capacity is the sum of the capacity between the polarizing plate 5 and the first transparent electrode 3 and the capacity existing between the person and the ground. If the touch panel 30a is not touched, the position detection electrode A Since the same voltage is applied from B, C and D, no steady current flows.

[0075] The electrical resistance between the capacitively coupled contact portion and each position detection electrode A, B, C, and D of the first transparent electrode 3 is the contact resistance and each position detection electrode A, B, C, and D. Is proportional to the distance between. Therefore, a current proportional to each distance between the contact portion and the position detection electrodes A, B, C, and D flows through the position detection electrodes A, B, C, and D of the first transparent electrode 3. It will be awkward. By detecting the magnitude of these currents, the position coordinates of the contact portion can be obtained.

[0076] The basic principle of the position detection method using the capacitive coupling method employed in the present invention will be described with reference to FIG.

In FIG. 5, a one-dimensional resistor sandwiched between electrodes A and B is shown for ease of explanation. In an actual display device, the opposing conductive film having a two-dimensional extent performs the same function as this one-dimensional antibody.

A current-voltage conversion resistor r is connected to each of the electrodes A and B. electrode

A and B are connected to a position detection circuit.

[0079] A voltage having the same homologous potential (AC e) is applied between the electrode A and the ground and between the electrode B and the ground. At this time, since the electrodes A and B are always at the same potential, no current flows between the electrodes A and B.

[0080] If the position X is touched with a finger, the resistance from the position X touched by the finger to the electrode A is R, the resistance from the position X to the electrode B is R, and R = R + R . At this time,

1 2 1 2 When impedance is Z, current through electrode A is i, and current through electrode B is i

1 2

The following formula is established.

[0081] e = ri + R i + (i + i) Z (Formula 1)

1 1 1 1 2

e = ri + R i + (i + i) Z (Formula 2)

2 2 2 2 2

From the above formulas 1 and 2, the following formulas 3 and 4 are obtained.

[0082] i (r + R) = i (r + R) (Equation 3)

1 1 2 2

i = i (r + R) / (r + R) (Equation 4)

2 1 1 2

Substituting Equation 4 into Equation 1 yields Equation 5 below.

[0083] e = ri + R i + (i + i (r + R) / (r + R)) Z = i (R (Z + r) + RR + 2Zr + r ² ) / (r + R) (Equation 5)

1 1 2 2

From the above equation 5, the following equation 6 is obtained.

[0084] i = e (r + R) / (R (Z + r) + RR + 2Zr + r ² ) (Formula 6)

1 2 1 2

Similarly, Equation 7 is obtained.

[0085] i = e (r + R) / (R (Z + r) + RR + 2Zr + r ² ) (Formula 7)

2 1 1 2

Here, when the ratio of R and R is expressed by using the entire resistance R, the equation (8) is obtained.

1 2

[0086] R / R = (2r / R + l) i / (i + i) -r / R (Formula 8)

1 2 1 2

Since r and R are known, the current i flowing through electrode A and the current i flowing through electrode B are measured.

1 2

From equation 8, R ZR

1 can be determined. R ZR

1 does not depend on the impedance Z including the person touching the finger. Therefore, as long as impedance Z is not zero or infinite, Equation 8 holds, and changes and conditions due to people and materials can be ignored.

Next, the case where the relational expression in the one-dimensional case is expanded to the two-dimensional case will be described with reference to FIG. Here, as shown in FIG. 4, position detection electrodes A, B, C, and D are formed at each corner (four corners) of the first transparent electrode 3. These position detection electrodes A, B, C, and D are connected to a position detection circuit via a position detection wiring portion 11 and a position detection wiring terminal portion 13.

[0088] The position detection electrodes A, B, C, and D are applied with alternating voltages of the same homogenous potential, and the currents flowing through the four corners of the first transparent electrode 3 by contact with a finger or the like are respectively i, i, i and i

1 2 3 4

. In this case, the following expression is obtained by the same calculation as the above calculation.

[0089] X = k + k-(i (i + i + i + i) (Equation 9)

1 2 2 3 1 2 3 4

Y = k + k (i + i + i + i + i) (Equation 10)

1 2 2 3 1 2 3 4

Here, X is the X coordinate of the touched position on the first transparent electrode 3, and Y is the Y coordinate of the touched position on the first transparent electrode 3. K is the offset, k is the magnification

1 2 There are. k and k are constants that do not depend on human impedance.

1 2

[0090] Based on the above formulas 9 and 10, i, i, i flowing through the position detection electrodes A, B, C and D

The measured force of 1 2 3 and i can also determine the contact position.

Four

[0091] In the above example, electrodes are arranged at the four corners of the first transparent electrode 3, and a current flowing through each electrode is measured to detect a contact position on a two-dimensionally spread surface. But second 1 The number of electrodes of transparent electrode 3 is not limited to four. The minimum number of electrodes required for two-dimensional position detection is 3. By increasing the number of force electrodes to 5 or more, the accuracy of position detection can be improved.

[0092] In order to determine the coordinates of the contact position in accordance with the principle described above, it is necessary to measure the value of the current flowing through the plurality of position detection electrodes A, B, C and D provided on the first transparent electrode 3. .

Next, a method for manufacturing the touch panel display device 50a according to Embodiment 1 of the present invention will be described. The touch panel display device 50a is manufactured through an active matrix substrate manufacturing process, a touch panel manufacturing process, and a touch panel display device manufacturing process, which will be described later.

[0094] Active matrix substrate manufacturing process>

First, a metal film (thickness 1500 mm) that has aluminum isotropic force over the entire substrate on the first glass substrate 8.

A) is formed by sputtering, and then a pattern is formed by a photolithography technique (hereinafter referred to as “PEP technique”) to form gate lines, gate electrodes, and capacitor lines.

[0095] Next, on the entire substrate on the gate line, gate electrode, and capacitor line, CVD (Chemical Vapor

A silicon nitride film (thickness of about 4000 A) is formed by the D mark osition method, and a gate insulating film is formed.

Next, an intrinsic amorphous silicon film (thickness of about 1500 A) and a phosphorus-doped n + amorphous silicon film (thickness of about 400 A) are continuously formed on the entire substrate on the gate insulating film by a CVD method. After that, a film is formed into an island shape by the PEP technique, and a semiconductor layer such as an intrinsic amorphous silicon layer and an _n + amorphous silicon layer is formed.

[0097] Next, a metal film (thickness of about 1500 A) made of aluminum, titanium, or the like is formed on the gate insulating film on which the semiconductor layer is formed by sputtering, and then patterned by PEP technology. A source line, a source electrode, and a drain electrode are formed.

Next, the n + amorphous silicon layer is etched away using the source electrode and the drain electrode as a mask to form a channel portion.

[0099] Next, a photosensitive acrylic resin film (thickness of about 3 μm) or the like is applied to the entire substrate on the gate insulating film on which the source electrode and the drain electrode are formed by using a spin coating method. Form an edge film.

[0100] Next, a portion corresponding to the drain electrode of the interlayer insulating film is removed by etching to form a contact hole.

[0101] Next, a transparent conductive film (thickness of about 1000 A) made of a polycrystalline ITO (Indium Tin Oxide) film is formed on the entire substrate on the interlayer insulating film by sputtering, and then the PEP technology Then, the pixel electrode 7a is formed by pattern formation.

[0102] Next, polyimide resin is applied to the entire substrate on which the pixel electrode 7a is formed at a thickness of about 500 A, and an alignment treatment is performed on the surface by rubbing to form an alignment film.

[0103] As described above, the active matrix substrate 20 in which the TFT array layer 7 is formed on the first glass substrate 8 can be manufactured.

Note that the first glass substrate 8 has a region extending outside the periphery of the display region, in which the pixel TFT in the display region is driven, and a desired amount of charge is applied to the pixel electrode 7a. A drive circuit (a gate driver and a source drain) for supply is formed.

[0105] In addition, in the preferred embodiment, the TFT constituting the drive circuit is formed in the same process as the TFT in the display region, so that the semiconductor layer is made of a polycrystalline silicon film in order to increase the operation speed of the drive circuit. It is preferable to do. Furthermore, in order to increase the TFT operating speed as much as possible, it is desirable to fabricate the TFT using a CGS (Continuous Grain Silicon) film.

[0106] <Touch panel manufacturing process>

First, a transparent conductive film (thickness 50 to 150 A) made of an amorphous ITO film or an IZO (Indium Zinc Oxide) film is formed on the second glass substrate 4 so that the surface resistance is 00 to 1600 Ω. A first transparent electrode 3 is formed by sputtering using a mask. The transparent conductive film may be a polycrystalline film or an In 2 O film as long as the predetermined surface resistance is reached.

twenty three

Here, since the thickness of the first transparent electrode 3 is not less than 50A and not more than 150A, a signal for position detection is reliably generated in the first transparent electrode 3, and the signal for position detection is generated. This can be transmitted to the position detection circuit without fail. On the other hand, if the thickness of the first transparent electrode 3 is less than 50 A, the electrical resistance of the first transparent electrode 3 becomes too high, and it is difficult to accurately detect the touched position. is there. The thickness of the first transparent electrode 3 exceeds 150A. In such a case, the transmittance of the first transparent conductive film is greatly reduced, and the display quality is impaired.

[0108] Further, since the amorphous ITO film or the IZO film has a higher electrical resistance than the polycrystalline ITO film, the second transparent electrode 1 to which a display signal is supplied is formed of a polycrystalline film. In the general case formed by a conductive ITO film, the first transparent electrode 3 for detecting the touch position has a higher electrical resistance than the second transparent electrode 1.

[0109] Next, along the peripheral edge of the first transparent electrode 3, a transparent conductive film (thickness of about 3000 A) having an ITO film equal force was used using a mask so that the surface resistance was 3 to 5 Ω. A frame 12 is formed by sputtering.

[0110] Next, on the substrate on which the first transparent electrode 3 and the frame portion 12 are formed, an Ag alloy (thickness of about 300 OA) is masked so that the surface resistance is 0.2 to 0.3 Ω. Films are formed by the sputtering method used to form the position detection wiring part 11 and the position detection electrodes A, B, C and D.

[0111] Next, the entire thickness of the substrate on which the position detection wiring portion 11 and the position detection electrodes A, B, C, and D are formed is coated with a photosensitive resist material containing a black pigment using a printing method. Apply at ~ 2 m, and then form a black matrix 2b by patterning using PEP technology.

[0112] Next, a photosensitive resist material or the like in which any one of red, green, and blue pigments is dispersed is applied to the entire substrate on which the black matrix 2b is formed in a thickness of about 1 to 3 μm. Thereafter, a pattern is formed by the PEP technique to form the colored layer 2a of the selected color. Further, the same process is repeated for the other two colors to form a color filter layer 2 in which a colored layer 2a of one color is provided for each pixel.

[0113] Here, when the film thickness of the color filter layer 2 is about 1 to 3 m, the first transparent electrode 3 for detecting the touch position and the second transparent electrode 1 to which the counter signal is inputted, Due to the electrical capacitance C between the first transparent electrode 3 and the second transparent electrode 1, interference may occur, making it difficult to detect the touch position. Therefore, it is desirable to laminate a transparent insulating layer 14 on the color filter layer 2 as shown in FIG. 7 so as not to be affected by the counter signal. This insulating layer 14 is formed after the color filter layer 2 is formed. Alternatively, it may be formed between the first transparent electrode 3 and the color filter layer 2 after the first transparent layer 3 is formed. The insulating layer 14 is made of a photosensitive resist material or the like, and is laminated using PEP technology, a plate, an ink jet, or the like. The capacitance C between the first transparent electrode 3 and the second transparent electrode 1 is calculated by ε (dielectric constant) XS (area) Zd (film thickness). Therefore, the thickness of the insulating layer 14 is about 30 m. If the insulating layer 14 is not provided, the electric capacity C becomes about 0.3 F, and interference is likely to occur between the first transparent electrode 3 and the second transparent electrode 1.

[0114] Next, a transparent conductive film (thickness of about 1400 A) such as an ITO film is applied to the entire substrate on which the color filter layer 2 is formed, so that the surface resistance is 30 to about Ω. The second transparent electrode 1 is formed by forming a film by a notching method using a mask.

Next, a polyimide resin is applied to the entire substrate on which the pixel electrode 7a is formed at a thickness of about 500 A, and an alignment treatment is performed on the surface by rubbing to form an alignment film.

[0116] The touch panel 30a can be manufactured as described above.

[0117] <Touch panel display device manufacturing process>

First, by applying screen printing to one of the active matrix substrate 20 and the touch panel 30a, a sealing material having a thermosetting epoxy resin equivalent force is applied to the frame-like pattern lacking the liquid crystal inlet portion, and applied to the other substrate. Sprinkle spherical spacers with a diameter corresponding to the thickness of the liquid crystal layer and made of resin or silica.

[0118] Next, the active matrix substrate 20 and the touch panel 30a are bonded together, the sealing material is cured, and empty cells are formed.

[0119] Next, a liquid crystal material is injected between the active matrix substrate 20 and the touch panel 30a of the empty cell by a decompression method to form a liquid crystal layer 40. Then, apply UV curable resin to the liquid crystal injection port, cure the UV curable resin by UV irradiation, and seal the injection port.

Next, the polarizing plate 5, the optical sheets 10 and the backlight 6 are attached to the surface of the active matrix substrate 20, and the polarizing plate 5 is attached to the surface of the touch panel 30a.

[0121] The touch panel display device 50a can be manufactured as described above.

[0122] As described above, according to the touch panel display device 50a according to the first embodiment of the present invention. For example, by supplying a display signal to each pixel electrode 7a provided on the first glass substrate 8 and to the second transparent electrode 1 provided on the second glass substrate 4, the liquid crystal layer 40 is supplied with a display signal. A voltage is applied and an image is displayed.

[0123] Further, by touching the surface of the polarizing plate 5 of the second glass substrate 4, the first transparent electrode 3 has the capacitance of the touched human body at the position touched across the second glass substrate 4. The resistance value between the position detection electrodes A, B, C, and D provided around the first transparent electrode 3 and the contact point changes. Then, by detecting this change by the position detection circuit, the touched position is detected and functions as a capacitive coupling type touch panel.

[0124] Furthermore, since the first transparent electrode 3 for detecting the touch position is generally electrically higher in resistance than the second transparent electrode 1 to which a display signal is supplied, the position detection signal is the first one. The signal can be reliably generated at the 1 transparent electrode 3 and a display signal can be promptly supplied to the liquid crystal layer 40 via the second transparent electrode 1.

Therefore, even if the touch panel display device 50a of the present embodiment has a touch panel function, the occurrence of shadowing can be suppressed and deterioration of display quality can be suppressed.

[0126] Conventionally, a touch panel on which a transparent electrode for detecting the touch position is formed is mounted on the front surface of the display screen of the display device, so that three substrates are used as a display device having a touch panel function. Whereas the touch panel display device 50a of the present embodiment is composed of two glass substrates 4 and 8 and one glass substrate is omitted, the device itself can be made thin and light. it can.

[0127] Therefore, it is possible to suppress the deterioration of display quality in the capacitive coupling type touch panel and to make the device itself thin and light.

Further, in the conventional touch panel display device, as shown in FIG. 13, since the air layer 118 exists between the polarizing plate 105 and the touch panel 130 attached to the surface, the refractive index of the air layer 118 is reduced. If the difference becomes large and the light transmittance decreases !, the touch panel display device 50a of the present embodiment has no air layer corresponding to the air layer 118. The transmittance can be improved.

[0129] Further, in the manufacturing process of the conventional touch panel display device, the liquid crystal panel can be manufactured. After finishing the process, the polarizing plate is attached in a separate process, and after the module is mounted, the touch panel is further attached. On the other hand, the touch panel display device 50a according to the present embodiment has the function of the touch panel. Since it is built into the counter substrate, in-line production is possible, and the manufacturing process can be reduced.

[0130] Further, the touch panel display device 50a of the present embodiment is constituted by two glass substrates 4 and 8, and it is possible to omit one glass substrate as compared with the conventional glass substrate as described above. The number of divisions of the substrate can be reduced, and the manufacturing process can be reduced. Therefore, it is possible to suppress a decrease in manufacturing yield due to adhesion of cullet (glass waste) at the time of division.

<< Embodiment 2 of the Invention >>

The touch panel display device according to Embodiment 2 of the present invention will be described below. In the following embodiments, the same parts as those in FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description thereof is omitted.

[0133] The touch panel display device 50c is a display medium layer sandwiched between the active matrix substrate 20, the touch panel 30c disposed opposite to the active matrix substrate 20, and the active matrix substrate 20 and the touch panel 30c. A liquid layer 40; a backlight 6 provided on the lower side of the active matrix substrate 20 via the polarizing plate 5 and the optical sheet 10; and a polarizing plate 5 provided on the upper side of the touch panel 30c. The

In the touch panel display device 50c, the components other than the touch panel 30c are substantially the same as those in the first embodiment, and therefore, the touch panel 30c will be mainly described.

[0135] The touch panel 30c is provided so as to cover the second glass substrate 4 as the second substrate, the color filter layer 2 provided on the second glass substrate 4, and the color filter layer 2. A first transparent electrode 3 which is a first transparent conductive film for detecting the position, a insulating layer 14 covering the first transparent electrode 3, and a display signal provided so as to cover the insulating layer 14. And a second transparent electrode 1 which is a second transparent conductive film to which is supplied.

[0136] Next, a method for manufacturing the touch panel 30c will be described. [0137] First, a photosensitive resist material containing a black pigment is applied to the entire substrate of the second glass substrate 4 at a thickness of about 1-2 / ζ πι using a printing method, and then by PEP technology. A black matrix 2b is formed by pattern formation.

[0138] Next, a photosensitive resist material or the like in which any one of red, green, and blue pigments is dispersed is applied to the entire substrate on which the black matrix 2b is formed in a thickness of about 1 to 3 μm. Thereafter, a pattern is formed by the PEP technique to form the colored layer 2a of the selected color. Further, the same process is repeated for the other two colors to form a color filter layer 2 in which a colored layer 2a of one color is provided for each pixel.

[0139] Next, a transparent conductive film (thickness 50-: LOOA) made of an amorphous ITO film or IZO film is formed by sputtering using a mask so as to have a surface resistance of 00-1600 Ω. The first transparent electrode 3 is formed as a film. This transparent conductive film may be a polycrystalline film or an In 2 O film as long as it has the predetermined surface resistance.

twenty three

[0140] Next, along the peripheral edge of the first transparent electrode 3, a transparent conductive film (thickness of about 3000 A) having an ITO film equal force was used with a mask so that the surface resistance was 3 to 5 Ω. A frame 12 is formed by sputtering.

[0141] Next, on the substrate on which the first transparent electrode 3 is formed, an Ag alloy (thickness of about 3000 mm) is sputtered using a mask so that the surface resistance is 0.2 to 0.3 Ω. The film is formed by the method, and the position detection wiring portion 11 and the position detection electrodes A, B, C, and D are formed.

[0142] Next, a photosensitive resist material or the like is applied to the entire substrate on which the first transparent electrode 3 is formed to a thickness of 30.

Apply at about / z m, and then form a pattern by PEP technology to form the insulating layer 14

[0143] Next, a transparent conductive film (thickness of about 1400A) such as an ITO film is applied to the entire substrate on which the insulating layer 14 has been formed, with a mask so that the surface resistance is 30 to: Ω Ω. The second transparent electrode 1 is formed by film formation by the sputtering method used.

[0144] Next, polyimide resin is applied to the entire substrate on which the pixel electrode 7a is formed at a thickness of about 500 A, and an alignment process is performed on the surface by rubbing to form an alignment film.

[0145] The touch panel 30c can be manufactured as described above.

As described above, according to the touch panel display device 50c according to the second embodiment of the present invention. For example, the first transparent electrode 3, the insulating layer 14, and the second transparent electrode 1 may be formed in this order on a general color filter substrate in which a color filter layer is formed on a glass substrate.

Since the structure of the touch panel of the present invention can be realized, the effects of the present invention can be achieved using a general commercially available color filter substrate.

<< Embodiment 3 of the Invention >>

The touch panel display device according to Embodiment 3 of the present invention will be described below.

[0149] The touch panel display device 50d is a display medium layer sandwiched between the active matrix substrate 20, the touch panel 30d disposed opposite to the active matrix substrate 20, and the active matrix substrate 20 and the touch panel 30d. A liquid layer 40; a backlight 6 provided on the lower side of the active matrix substrate 20 via the polarizing plate 5 and the optical sheet 10; and a polarizing plate 5 provided on the upper side of the touch panel 30d. .

[0150] In the touch panel display device 50d, the components other than the touch panel 30d are substantially the same as those in the first embodiment, and therefore, the touch panel 30d will be mainly described.

[0151] The touch panel 30d is provided so as to cover the second glass substrate 4 as the second substrate, the color filter layer 2 provided on the lower side of the second glass substrate 4, and the color filter layer 2. A second transparent electrode 1 that is a second transparent conductive film to which a display signal is supplied and a first glass electrode provided on the upper side of the second glass substrate 4 for detecting the touched position. And a first transparent electrode 3 which is a transparent conductive film.

[0152] Next, a method for manufacturing the touch panel 30d will be described.

[0153] First, a transparent conductive film (thickness 50-: L00A) made of an amorphous ITO film or IZO film is applied to the entire surface of one surface of the second glass substrate 4, and the surface resistance is 00-1600 Ω. Then, the first transparent electrode 3 is formed by sputtering using a mask. The transparent conductive film may be a polycrystalline film or an In 2 O film as long as the predetermined surface resistance is reached.

twenty three

[0154] Next, a photosensitive resist material containing a black pigment is applied to the entire substrate on the other side of the second glass substrate 4 with a thickness of about 1 to 2 m using a printing method, and then The black matrix 2b is formed by patterning using PEP technology. [0155] Next, a photosensitive resist material or the like in which any one of red, green, and blue pigments is dispersed is applied to the entire substrate on which the black matrix 2b is formed in a thickness of about 1 to 3 μm. Thereafter, a pattern is formed by the PEP technique to form the colored layer 2a of the selected color. Further, the same process is repeated for the other two colors to form a color filter layer 2 in which a colored layer 2a of one color is provided for each pixel.

[0156] Next, a transparent conductive film (thickness of about 1400 A) such as an ITO film is applied to the entire substrate on which the color filter layer 2 is formed, so that the surface resistance is 30 to: ΟΟ Ω. The second transparent electrode 1 is formed by forming a film by a sputtering method using a mask.

[0157] Next, polyimide resin is applied to the entire substrate on which the pixel electrode 7a is formed at a thickness of about 500 A, and an alignment treatment is performed on the surface by rubbing to form an alignment film.

[0158] The touch panel 30d can be manufactured as described above.

[0159] As described above, according to the touch panel display device 50d according to Embodiment 3 of the present invention, the first transparent electrode 3 and the general color filter substrate in which the color filter layer is formed on the glass substrate. By forming the second transparent electrode 1, the structure of the touch panel of the present invention can be realized, so that the effects of the present invention can be achieved using a general commercially available color filter substrate.

<< Embodiment 4 of the Invention >>

The touch panel display device according to Embodiment 4 of the present invention will be described below.

FIG. 10 is a schematic cross-sectional view of a touch panel 30e constituting the touch panel display device according to Embodiment 4 of the present invention. In this embodiment, the touch panel 30a of the first embodiment and the constituent force of the polarizing plate 5 become the touch panel 30e!

[0162] The touch panel 30e detects the second glass substrate 4 as the second substrate, the polarization pattern layer 15 provided on the second glass substrate 4, and the touched position covering the polarization pattern layer 15. A first transparent electrode 3 that is a first transparent conductive film, a color filter layer 2 that covers the first transparent electrode 3 and functions as an insulating layer, and covers the color filter layer 2 to display And a second transparent electrode 1 which is a second transparent conductive film to which a signal for use is supplied.

[0163] Next, a method for manufacturing the touch panel 30e will be described. [0164] First, a photosensitive resin film having a polarization characteristic (thickness 2 to 3; about ζ 偏光 η) or the like is applied to the entire second glass substrate 4 using a plate, and the polarization pattern layer 15 is applied. Form.

Next, a transparent conductive film (thickness 50 to 150 A) made of an amorphous ITO film or IZO film is applied to the entire substrate on which the polarization pattern layer 15 is formed so that the surface resistance is 00 to 1600 Ω. Then, a first transparent electrode 3 is formed by film formation by a sputtering method using a mask. This transparent conductive film may be a polycrystalline film or an InO film as long as it has the predetermined surface resistance.

twenty three

Good.

[0166] Next, along the peripheral edge of the first transparent electrode 3, a transparent conductive film (thickness 3000

The frame portion 12 is formed by sputtering using a mask so that the surface resistance is 3 to 5 Ω.

[0167] Next, on the substrate on which the first transparent electrode 3 is formed, an Ag alloy (thickness of about 3000 mm) is sputtered using a mask so that the surface resistance is 0.2 to 0.3 Ω. By film formation

The position detection wiring 11 and the position detection electrodes A, B, C and D are formed.

[0168] Next, a photosensitive resist material containing a black pigment is applied to the entire substrate on which the first transparent electrode 3 is formed using a printing method at a thickness of about 1/2 / ππι, and then The black matrix 2b is formed by forming a turn using PEP technology.

[0169] Next, a photosensitive resist material in which any of red, green and blue pigments is dispersed is applied to the entire substrate on which the black matrix 2b is formed in a thickness of about 1 to 3 μm. Thereafter, a pattern is formed by the PEP technique to form the colored layer 2a of the selected color. Further, the same process is repeated for the other two colors to form a color filter layer 2 in which a colored layer 2a of one color is provided for each pixel.

[0170] Next, a transparent conductive film (thickness of about 1400 A) such as an ITO film is applied to the entire substrate on which the color filter layer 2 is formed, so that the surface resistance is 30 to: ΟΟ Ω. The second transparent electrode 1 is formed by forming a film by a sputtering method using a mask.

[0171] Next, polyimide resin is applied to the entire substrate on which the pixel electrode 7a is formed at a thickness of about 500 A, and an alignment treatment is performed on the surface by rubbing to form an alignment film.

[0172] The touch panel 30e can be manufactured as described above.

[0173] As described above, according to the touch panel display device according to Embodiment 4 of the present invention, Conventionally, a polarizing plate that has been attached to the surface of a display device can be incorporated into the inside of the display device, so that the step of attaching the polarizing plate can be reduced.

In the present embodiment, the polarization pattern layer 15 is applied instead of the polarizing plate 5 constituting the touch panel 30a of the first embodiment. However, the polarization pattern layer 15 is used in the touch panels of the above-described and following embodiments. You can apply it!

[0175] Embodiment 5 of the Invention

The touch panel display device according to Embodiment 5 of the present invention will be described below.

[0177] The touch panel display device 50f includes a liquid crystal display panel 45 for displaying an image, a touch panel 30f disposed opposite to the liquid crystal display panel 45 with a polarizing plate 5 and a retardation plate 9, and a liquid crystal display panel 45. A backlight 6 provided through a polarizing plate 5 and an optical sheet 10 is provided on the lower side in FIG. The touch panel display device 50f displays different images for a plurality of viewpoints, such as a 2DZ3D switching type liquid crystal display panel that enables switching between 2D display and 3D display by the touch panel 30f that functions as a switching panel. The first display state to be switched and the second display state to display one image in the full screen display can be switched.

[0178] The liquid crystal display panel 45 is sandwiched between the active matrix substrate 20a and the color filter substrate 35, which are a pair of display panel substrates arranged to face each other, and the active matrix substrate 20a and the color filter substrate 35. And a liquid layer 40 as a display medium layer.

[0179] The active matrix substrate 20a has an FPC (Flexible for inputting image data corresponding to an image to be displayed at the end of the active matrix substrate 20 of each of the embodiments described above.

Wiring 21a such as Printed Circuit) is attached!

[0180] The color filter substrate 35 is provided so as to cover the glass substrate 19c, the color filter layer 2 provided on the glass substrate 19, and the color filter layer 2, and a display signal (image data). And a second transparent electrode 1 to which is supplied.

[0181] The touch panel 30f is a pair of switching panel substrates disposed to face each other. A driving substrate 19a and a counter substrate 19b, a liquid crystal layer 41 sandwiched between the driving substrate 19a and the counter substrate 19b, and a polarizing plate 5 provided on the surface of the counter substrate 19b.

[0182] The drive substrate 19a is provided with a drive electrode for applying a drive voltage when the liquid crystal layer 41 is turned on, and a wiring 21b such as an FPC (Flex¾le Printed Circuit) is attached.

[0183] The counter substrate 19b includes a first transparent electrode 3 which is a transparent conductive film for detecting the touched position, an insulating layer so as to cover the first transparent electrode 3, and a liquid crystal on the insulating layer. A drive electrode for applying a drive voltage when the layer 41 is ON is provided.

[0184] The first transparent electrode 3 is provided with a position detection electrode electrically connected to each corner of the peripheral end thereof, as in the above embodiments. The counter substrate 19b covers the position detection wiring portion extending from each position detection electrode, the position detection wiring terminal portion that is the end of the position detection wiring portion, and the peripheral edge of the first transparent electrode 3. And a frame portion provided in the frame.

[0185] Here, in the touch panel display device 50f, the polarization state of the transmitted light is switched according to ONZOFF of the liquid crystal layer 41 just by functioning as a position detecting means for detecting the touched position of the touch panel 30f. It functions as a switching means that is possible. For example, the touch panel 30f functions as a switching means by changing the optical modulation action to the transmitted light between 2D display and 3D display.

[0186] Next, a method for manufacturing the touch panel display device 50f will be described. The touch panel display device 50f is manufactured through the active matrix substrate manufacturing process described in the first embodiment, the color filter substrate manufacturing process, the touch panel manufacturing process, and the touch panel display device manufacturing process described below.

[0187] <Color filter substrate fabrication process>

First, a photosensitive resist material containing a black pigment is applied to the entire substrate on the glass substrate 19c with a thickness of about 1-2 / ζ πι using a printing method, and then a black pattern is formed by PEP technology. A matrix 2b is formed.

Next, a photosensitive resist material in which any of red, green and blue pigments is dispersed is applied to the entire substrate on which the black matrix 2b is formed in a thickness of about 1 to 3 μm. And that Thereafter, a pattern is formed by the PEP technique to form the colored layer 2a of the selected color. Further, the same process is repeated for the other two colors to form a color filter layer 2 in which a colored layer 2a of one color is provided for each pixel.

[0189] Next, a transparent conductive film (thickness of about 1400 A) such as an ITO film is applied to the entire substrate on which the color filter layer 2 is formed, so that the surface resistance is 30 to: ΟΟ Ω. The second transparent electrode 1 is formed by forming a film by a sputtering method using a mask.

[0191] The color filter substrate 35 can be produced as described above.

[0192] <Touch panel manufacturing process>

First, a transparent conductive film (thickness of about 100 A) such as an ITO film is formed on a glass substrate by a sputtering method using a mask to form drive electrodes and the like.

[0193] Next, a polyimide resin is applied to the entire substrate on the drive substrate 19a on which the drive electrodes and the like are formed at a thickness of about 500A, and an alignment treatment is performed on the surface by rubbing to form an alignment film. Then, a driving substrate 19a is manufactured.

Further, a transparent conductive film (thickness 50 to 150 A) made of an amorphous ITO film or an IZO (Indium Zinc Oxide) film is formed on the glass substrate 19 so that the surface resistance is 00 to 1600 Ω. Then, a transparent electrode 3 is formed by forming a film by a sputtering method using a mask. This transparent conductive film

As long as the predetermined surface resistance is reached, a polycrystalline film or an In 2 O film may be used.

twenty three

[0195] Next, along the peripheral edge of the first transparent electrode 3, a transparent conductive film (thickness of about 3000 A) having an ITO film equal force was used with a mask so that the surface resistance was 3 to 5 Ω. The frame is formed by sputtering.

[0196] Next, on the substrate on which the first transparent electrode 3 and the frame portion are formed, an Ag alloy (thickness of about 3000 A) is used so that the surface resistance is 0.2 to 0.3 Ω. The position detection wiring portion and each position detection electrode are formed by the sputtering method.

[0197] Next, a photosensitive resist material or the like is applied to the entire substrate on which the transparent electrode 3, the frame portion, the position detection wiring portion, and each position detection electrode are formed to a thickness of about 1 to 3 m, and thereafter Then, the insulating layer is formed by patterning with PE P technology. Next, a transparent conductive film (thickness 140) such as an ITO film is formed on the entire substrate on which the insulating layer is formed.

OA) is formed by a sputtering method using a mask so that the surface resistance is 30 to: ΩΩ, thereby forming drive electrodes and the like.

[0199] Next, polyimide resin was applied to the entire substrate on which the drive electrodes and the like were formed to a thickness of about 500 mm, and the surface was subjected to orientation treatment by a rubbing method to produce a counter substrate 19b. The

[0200] Next, by applying screen printing to one of the driving substrate 19a and the counter substrate 19b, a seal material having the same strength as thermosetting epoxy resin is applied to the frame-shaped pattern lacking the liquid crystal inlet portion. Then, a spherical spacer having a diameter corresponding to the thickness of the liquid crystal layer and made of resin or silica is sprayed on the other substrate.

[0201] Next, the driving substrate 19a and the counter substrate 19b are bonded together, the sealing material is cured, and an empty cell is formed.

[0202] Next, a liquid crystal material is injected between the driving substrate 19a and the counter substrate 19b of the empty cell by a decompression method to form a liquid crystal layer 41. Then, apply UV curable resin to the liquid crystal inlet, cure the UV curable resin by UV irradiation, and seal the inlet.

[0203] Next, the polarizing plate 5 is attached to the surface of the counter substrate 19b.

[0204] The touch panel 30f can be manufactured as described above.

[0205] <Touch panel display device manufacturing process>

First, a seal material such as a thermosetting epoxy resin is applied on one of the active matrix substrate 20a and the color filter substrate 35 to a frame-like pattern lacking the liquid crystal injection port by screen printing, and the other A spherical spacer made of resin or silica having a diameter corresponding to the thickness of the liquid crystal layer is sprayed on the substrate.

[0206] Next, the active matrix substrate 20a and the color filter substrate 35 are bonded together, and the seal material is cured to form empty cells.

[0207] Next, a liquid crystal material is injected between the active matrix substrate 20a of the empty cell and the color filter substrate 35 by a decompression method to form a liquid crystal layer 40. Thereafter, a UV curable resin is applied to the liquid crystal injection port, the UV curable resin is cured by UV irradiation, the injection port is sealed, and the liquid crystal display panel 45 is manufactured. [0208] Next, the polarizing plate 5 is provided on the surface of the active matrix substrate 20a constituting the liquid crystal display panel 45, and the polarizing plate 5, the optical sheets 10 and the backlight 6 are provided on the surface of the color filter substrate 35 constituting the liquid crystal display panel 45. Attach to each.

[0209] Next, the touch panel 30f is attached to the drive substrate 19a side via the phase difference plate 9 on the active matrix substrate 20a side of the liquid crystal display panel 45 to which the polarizing plate 5 and the like are attached.

[0210] The touch panel display device 50f can be manufactured as described above.

[0211] As described above, according to the touch panel display device 50f according to Embodiment 5 of the present invention, the pixel electrodes 7a provided on the first glass substrate 8 and the second glass substrate 4 are provided. By supplying a display signal to each of the second transparent electrodes 1, a voltage is applied to the liquid crystal layer 40 and an image is displayed.

[0212] In addition, by touching the surface of the polarizing plate 5 of the counter substrate 19b, the first transparent electrode 3 is grounded via the capacitance of the touched human body at the position touched over the glass substrate 19. Then, a change occurs in the resistance value between each position detection electrode provided around the first transparent electrode 3 and the ground point. By detecting this change by the position detection circuit, the touched position is detected, and it functions as a capacitively coupled touch panel.

[0213] Furthermore, since the first transparent electrode 3 for detecting the touch position is generally electrically higher in resistance than the second transparent electrode 1 to which the display signal is supplied, the position detection signal is the first one. The signal can be reliably generated at the 1 transparent electrode 3 and a display signal can be promptly supplied to the liquid crystal layer 40 via the second transparent electrode 1.

[0214] Therefore, even if the touch panel display device 50f of the present embodiment has a touch panel function, generation of shadowing can be suppressed and deterioration of display quality can be suppressed.

[0215] Conventionally, five touch panels having a touch panel function and a display switching function are provided by attaching a touch panel on which a transparent electrode for detecting the touch position is formed in front of the display screen of the display device. The touch panel display device 50f of the present embodiment is composed of four glass substrates, omitting one glass substrate! /, So the device itself is thin and lightweight. Can be. [0216] Therefore, in the capacitively coupled touch panel, it is possible to suppress deterioration of display quality and to make the device itself thin and light.

[0217] Further, in the touch panel display device 50f of the present embodiment, the touch panel 30f is configured as shown in FIG.

A touch panel as shown in 2 may be 30 g. In the touch panel 30g, only the first transparent electrode 3 is provided between the counter substrate 19b and the polarizing plate 5, and the other configuration is substantially the same as that of the touch panel 30f.

[0218] Note that as a display method of the touch panel display device of the present invention, an active matrix drive type liquid crystal display device in which the switching element for driving the liquid crystal is TFT is suitable in terms of light weight and low power consumption. STN It can also be applied to liquid crystal display methods such as liquid crystal and other display devices such as organic EL.

Industrial applicability

[0219] As described above, the present invention is useful for car navigation systems, PDAs (Personal Digital Assistants) and the like because the device itself can be made thin and light.

Claims

The scope of the claims

[1] A touch panel display device for detecting a position touched by a capacitive coupling method and displaying an image,

A first substrate and a second substrate disposed opposite to each other;

A display medium layer provided between the first substrate and the second substrate;

A plurality of pixel electrodes disposed between the display medium layer and the first substrate; and a first transparent conductive film disposed between the display medium layer and the second substrate and detecting a touched position. When,

A second transparent conductive film provided between the first transparent conductive film and the display medium layer and supplied with a display signal;

An insulating layer interposed between the second transparent conductive film and the first transparent conductive film.

A touch panel display device characterized by V.

[2] The touch panel display device according to claim 1, wherein

A touch panel display device, wherein the surface resistance of the first transparent conductive film is 400 Ω or more and 1600 Ω or less.

[3] In the touch panel display device according to claim 1,

The touch panel display device, wherein the insulating layer is a single color filter layer.

[4] The touch panel display device according to claim 1, wherein

A color filter layer is provided between the second substrate and the first transparent conductive film.

A touch panel display device characterized by V.

[5] The touch panel display device according to claim 1, wherein

A touch panel display device, wherein the thickness of the first transparent conductive film is 50A or more and 150A or less.

[6] The touch panel display device according to claim 1, wherein

The touch panel display device, wherein the first transparent conductive film is formed of an amorphous compound of indium oxide and tin oxide or a compound of indium oxide and zinc oxide.

[7] Touch for detecting the position touched by the capacitive coupling method and displaying an image A panel display device,

A pair of display panel substrates disposed opposite to each other;

And a display medium layer provided between the pair of display panel substrates, and a display panel for displaying an image,

A pair of switching panel substrates disposed opposite to the display panel, and a switching panel that includes a liquid crystal layer provided between the pair of switching panel substrates and for switching an image display state.

A touch panel display device characterized in that a transparent conductive film for detecting a touched position is provided on a substrate on the far side of the display panel force among the pair of switching panel substrates.

A touch panel for detecting a position touched by a capacitive coupling method, comprising: a substrate;

A first transparent conductive film for detecting a touched position provided on the substrate; an insulating layer covering the first transparent conductive film;

A touch panel comprising: a second transparent conductive film provided so as to cover the insulating layer and supplied with a display signal.