US20070273672A1 - Touch screen system and display device using the same - Google Patents
Touch screen system and display device using the same Download PDFInfo
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- US20070273672A1 US20070273672A1 US11/882,864 US88286407A US2007273672A1 US 20070273672 A1 US20070273672 A1 US 20070273672A1 US 88286407 A US88286407 A US 88286407A US 2007273672 A1 US2007273672 A1 US 2007273672A1
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- United States
- Prior art keywords
- touch controller
- extension
- touch
- touch panel
- connection pads
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09145—Edge details
- H05K2201/09172—Notches between edge pads
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10954—Other details of electrical connections
- H05K2201/10992—Using different connection materials, e.g. different solders, for the same connection
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/321—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives
- H05K3/323—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by conductive adhesives by applying an anisotropic conductive adhesive layer over an array of pads
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/403—Edge contacts; Windows or holes in the substrate having plural connections on the walls thereof
Definitions
- the present invention relates to a touch panel system, and more particularly, to a touch panel system for a liquid crystal display (LCD) device.
- LCD liquid crystal display
- liquid crystal display (LCD) devices are commonly used because of their ability to produce high quality images, as well as their thin profile, light weight, and low power consumption.
- LCD liquid crystal display
- LCD modules are used for displaying video signals input from external sources, such as LCD panels, and commonly include polarizing plates, power sources, such as backlight devices, and light-guiding plates.
- the LCD panels include upper and lower glass substrates, and liquid crystal material injected between the upper and lower glass substrates.
- the polarizing plates are formed on lower and upper surfaces of the LCD panel for polarizing light irradiated onto the LCD panel using the backlight device.
- a printed circuit board (PCB) is provided below a main support at a rear of the LCM device, and a drive integrated circuit (D-IC) is provided on the PCB to drive switching devices (i.e., thin film transistors) of the LCM device.
- the LCM device is electrically connected to the PCB using a tape carrier package (TCP) so that the video signals of the D-IC are transmitted to the LCM device.
- a digitizer is provided in the LCD device to display images on a screen and to input electric graphic image signals thereon.
- the digitizer is commonly referred to as an electric graphic input panel (EGIP) or a touch panel. Due to rapid development of LCD technology, it is possible to perform graphic image work that requires high resolution on the LCD device, whereby the digitizer is used as an input device of a notebook computer.
- EGIP electric graphic input panel
- FIG. 1 is a schematic cross sectional view of a touch panel according to the related art.
- transparent ITO electrodes 3 and 4 are formed on opposing surfaces of two polyethylene terephtalate (PET) films 1 and 2 at a predetermined interval, wherein the two PET films 1 and 2 are bonded to each other using an insulating adhesive.
- PET polyethylene terephtalate
- a polyvinyl alcohol (PVA) film 5 is formed below the lower PET film 2 for polarizing light
- TAC triacetyl cellulose
- a silver (A/G) layer is formed on the upper PET film 1 .
- An operation of the touch panel which is categorized as a 4-line resistive-type touch panel, includes supplying a voltage to one transparent electrode along an X-axis direction, and supplying a voltage to another transparent electrode along a Y-axis direction.
- a voltage is supplied to an upper transparent electrode 3 along the X-axis direction
- a voltage is supplied to a lower transparent electrode 4 along the Y-axis direction. Accordingly, signals are respectively supplied to the X-axis and the Y-axis in order to detect a location of a touching point in order to read the signals twice.
- the upper and lower transparent electrodes 3 and 4 contact each other at a predetermined portion, and a voltage value of the X-axis location is read through the lower transparent electrode 4 .
- the upper and lower transparent electrodes 3 and 4 contact each other at a predetermined portion, and a voltage value of the Y-axis location is read through the upper transparent electrode 3 .
- the upper and lower transparent electrodes 3 and 4 have predetermined resistance values, so that the voltage value varies in accordance with a contact location of the upper and lower transparent electrodes 3 and 4 .
- X-axis and Y-axis voltage values are input to a controller, whereby the controller detects coordinates of the touching point according to the X-axis and the Y-axis values.
- the upper and lower transparent electrodes 3 and 4 contact each other at the predetermined portion. Accordingly, the voltage values, which vary by the resistance value of the touching point, is output. For example, in order to read the voltage values that vary by the resistance value of the touching point, electrodes and lines for supplying the voltage to the upper and lower transparent electrodes 3 and 4 is necessary in order to read the voltage values.
- FIG. 2 is a plan view of a connection structure between an extension of a touch panel and a controller according to the related art.
- a touch panel 9 includes two silver (A/G) electrodes 12 formed along left and right sides of an upper PET film 1 along the X-axis direction, and two A/G electrodes 11 formed along upper and lower sides of a lower PET film 2 along the Y-axis direction. Accordingly, the A/G electrodes 11 and 12 are formed within a dead space region of 2 ⁇ m to 3 ⁇ m along one direction of the touch panel 9 .
- a size of the touch panel 9 corresponds to sizes of an upper substrate of the LCD panel, wherein electrode lines of the touch panel 9 are formed in a 4-line resistive-type configuration.
- a touch controller 23 In order to operate the 4-line resistive-type touch panel, interconnect of the touch panel 9 , a touch controller 23 , and a computer (i.e., CPU) using signal lines is required.
- a device in which the touch panel 9 and the touch controller 23 are connected to each other is referred to as a touch screen assembly.
- the touch controller 23 switches voltages and output signals provided to the upper and lower substrates of the touch panel 9 , and receives input location information as electric signals. Then, the touch controller 23 converts the electric signal from analog signals to digital data, and transmits the digital data to the computer. Accordingly, the touch controller 23 is positioned separately from the LCD device, which is integrated with the touch panel, i.e, the touch controller 23 is positioned outside of the LCD device.
- the touch controller can be mounted inside the LCD device, and the touch controller may be provided as a chip-type device positioned at rear of the LCM device.
- the A/G electrodes 11 and 12 and conductive lines 13 a , 13 b , 13 c , and 13 d transmit and read the electric signals, and are formed within the dead space region of the touch panel 9 .
- an extension of one of four sides of the touch panel 9 provides a connection part 15 that include end portions of the conductive lines 13 a , 13 b , 13 c , and 13 d .
- a flexible printed circuit board (FPCB) 16 is connected to the end portions of the conductive lines 13 a , 13 b , 13 c , and 13 d at the connection part 15 .
- the FPCB 16 is used for electrically connecting the conductive lines 13 a , 13 b , 13 c , and 13 d of the A/G electrodes 11 and 12 of the touch panel 9 to the touch controller 23 .
- an FPCB connector 20 is mounted within the controller 23 so that a connection part 17 of the FPCB 16 is inserted into the FPCB connector 20 , thereby electrically interconnecting the A/G electrodes 11 and 12 of the touch panel 9 to the touch controller 23 . Since the FPCB 16 is formed of soft material(s), a stiffener is provided with the connection part 17 of the FPCB 16 for easy insertion of the connection part 17 of the FPCB 16 to the FPCB connector 20 .
- the signals output from the 4-line electrodes (A/G electrodes 11 and 12 ) of the touch panel 9 are transmitted to the touch controller 23 using the FPCB 16 that is inserted into the FPCB connector 20 of the touch controller 23 , thereby electrically interconnecting the touch panel 9 to the touch controller 23 .
- the signal connection structure between the touch panel and the touch controller according to the present invention has the following disadvantages.
- Third, when connecting the signal lines of the FPCB 16 to the FPCB connector 20 a connection failure may be generated.
- the present invention is directed to a touch screen system and display device using a touch screen system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a touch screen system having a signal connection structure between a touch panel and a touch controller for obtaining a thin profile and light weight device.
- Another object of the present invention is to provide a display device having a touch screen system having a signal connection structure between a touch panel and a touch controller for obtaining a thin profile and light weight device.
- a touch screen system includes a touch panel to input image signals, a touch controller to drive the touch panel, an extension between the touch panel and the touch controller, and an anisotropic conductive film electrically interconnecting the extension to the touch controller.
- a touch screen system in another aspect, includes a touch panel to input image signals, a touch controller to drive the touch panel, and an extension having a plurality of signal lines to transmit electrical signals between the touch panel and the touch controller, wherein the extension includes a plurality of end portions that correspond to a total number of the signal lines connected to the touch controller.
- a touch screen system in another aspect, includes a touch panel having a plurality of electrodes, a touch controller having a plurality of contact pads, and an extension having a first portion physically connected to an end region of the touch panel, a second portion electrically connected to the touch controller, and a third portion disposed between the first and second portions, wherein the second portion of the extension includes a plurality of individual end portions electrically connected to the plurality of contact pads.
- a liquid crystal display device in another aspect, includes a liquid crystal module, a touch controller provided in a touch controller area at a first edge of the liquid crystal module, a plurality of data driver integrated circuits provide along a second edge of the liquid crystal module within a data driver area, a plurality of gate driver integrated circuits provided along a third edge of the liquid crystal module within a gate driver area, and an extension provided along the data driver area into the touch controller area.
- FIG. 1 is a schematic cross sectional view of a touch panel according to the related art
- FIG. 2 is a plan view of a connection structure between an extension of a touch panel and a controller according to the related art
- FIG. 3 is a plan view of an exemplary signal connection structure between an extension and controller connection part according to the present invention.
- FIG. 4 is a perspective view of an exemplary anisotropic conductive adhesive according to the present invention.
- FIG. 5 is a cross sectional view of an exemplary extension and controller connection part according to the present invention.
- FIG. 6A is a plan view of another exemplary connection structure between an extension of a touch panel and a controller according to the present invention.
- FIG. 6B is an enlarged view of “A” of FIG. 6A according to the present invention.
- FIG. 6C is a cross sectional view along I-I′ of FIG. 6A according to the present invention.
- FIG. 7A is a cross sectional view along II-II′ of FIG. 6B according to the present invention.
- FIG. 7B is a cross sectional view along III-III′ of FIG. 6B according to the present invention.
- FIG. 8A is a plan view of an exemplary connection structure between an extension and controller according to the present invention.
- FIG. 8B is a cross sectional view along IV-IV′ of FIG. 8A according to the present invention.
- FIG. 9 is a plan view of an exemplary touch controller according to the present invention.
- FIG. 3 is a plan view of an exemplary signal connection structure between an extension and controller connection part according to the present invention.
- a plurality of connection pads 22 of a touch controller 23 may be formed on a PCB substrate having the touch controller 23 contained therein, and an anisotropic conductive film (ACF) 25 may be formed on an upper surface of the connection pads 22 .
- ACF anisotropic conductive film
- an extension 16 may be provided to be connected to a touch panel, which may be similar to the touch panel 9 (of FIG. 2 ), and may be formed on the ACF 25 . Accordingly, a plurality of signal lines 18 formed on the extension 16 may be connected to the connection pads 22 .
- the signal lines 18 of a connection part 17 of the extension 16 may be aligned to correspond to the connection pads 22 .
- the ACF 25 may include plastic material(s) coated with metal material(s).
- the ACF 25 may include a film upon which conductive particles, such as metal particles, are scattered, thereby simultaneously providing electric signal connection and adhesion.
- FIG. 4 is a perspective view of an exemplary anisotropic conductive adhesive according to the present invention.
- conductive particles 30 such as metal particles, may be scattered in an adhesive film 31 formed of thermoplastic or thermosetting resin(s), thereby forming the ACF 25 .
- a first conductive terminal may be formed on a front surface of the ACF 25 and a second conductive terminal may be formed on a rear surface of the ACF 25 .
- pressure may be applied to the ACF 25 so that the first conductive terminal is electrically connected to the second conductive terminal by the conductive particles 30 .
- the ACF 25 may be positioned between the extension 16 of the touch panel 9 (in FIG. 2 ) and the connection pads 22 of the touch controller 23 to electrically interconnect the extension 16 and the connection pads 22 .
- current may flow between the extension 16 and the connection pads 22 .
- FIG. 5 is a cross sectional view of an exemplary extension and controller connection part according to the present invention.
- the extension 16 may be formed to bond to the connection pads 22 of the touch controller 23 . Since the ACF 25 may be inserted between the extension 16 of the touch panel 9 (in FIG. 2 ) and the connection pads 22 of the touch controller 23 (in FIG. 3 ), then the signal lines 18 of the extension 16 (in FIG. 3 ) may be aligned to correspond to the connection pads 22 . Next, pressure and heat may be applied to the extension 16 and controller connection pads 22 , so that an adhesive 31 of the ACF 25 melts. Accordingly, the scattered conductive particles 30 of the ACF 25 may be pressed between each signal line 18 of the extension 16 and each connection pad 22 .
- the conductive particles 30 may be in electrical and physical contact with the signal lines 18 and the connection pads 22 , thereby ensuring sufficient electrical conduction.
- the adhesive 31 may be electrically charged between adjacent ones of the signal lines 18 , except at portions where the conductive particles 30 are present. Accordingly, the conductive particles 30 may be separately positioned, thereby obtaining high electrical insulating characteristics. Accordingly, adhesive reliability of the ACF 25 may be significantly affected by the performance of the conductive particles 30 and the adhesive 31 .
- the ACF 25 may provide electrical interconnect between the plurality of signal lines 18 and the connection pads 22 , accurate positioning of the plurality of signal lines 18 with respect to the connection pads 22 may be necessary. For example, if the plurality of signal lines 18 are not accurately positioned with respect to the connection pads 22 , interconnection between the touch panel 9 (in FIG. 2 ) and the touch controller 23 (in FIG. 3 ) may not be properly made. Accordingly, the touch controller 23 (in FIG. 3 ) may be mounted on a PCB that may include the connection pads 22 .
- connection pads 22 may be formed in the touch controller 23 to correspond to the signal lines 18 of the extension 16 . Accordingly, when the touch controller 23 is provided at a rear portion of an LCM, the touch controller 23 and the connection pads 22 may be mounted on a source or gate PCB at the rear of the LCM.
- a fixing guide 50 may be provided for fixing the location of the extension 16 to provide correct signal connection between each connection pad 22 and each signal line 18 of the extension 16 .
- the fixing guide 50 may be formed in a shape of “U” so that the connection part 17 of the extension 16 may be fixed by the fixing guide 50 .
- the fixing guide 50 may not be limited to a U-shape, and may have variable lengths and thicknesses.
- the fixing guide 50 may be formed to have a first thickness corresponding to a total thickness of the ACF 25 and a second thickness corresponding to a thickness of the extension 16 .
- connection part 17 of the extension 16 that opposes the touch controller 23 may be formed to electrically contact the signal lines 18 using the ACF 25 .
- the connection part 17 of the extension 16 may have signal lines 18 that extend from an upper surface to a lower surface for surrounding the connection part 17 of the extension 16 .
- the signal lines 18 may be formed only along the surface that opposes a connection part of the touch controller 23 .
- the ACF 25 may be electrically connected between the signal lines 18 of the extension 16 to the connection pads 22 of the touch controller 23 using a permanent connection, such as solder.
- FIG. 6A is a plan view of an exemplary connection structure between an extension of a touch panel and a controller according to the present invention
- FIG. 6B is an enlarged view of “A” of FIG. 6A according to the present invention
- FIG. 6C is a cross sectional view along I-I′ of FIG. 6A according to the present invention.
- the extension 16 may include end portions 16 b that may be divided into a plurality of finger portions 19 that may correspond to a plurality of signal lines 18 , and a main portion 16 a . Although four end portions 16 b are shown, any number of end portions 16 b may be provided that correspond to the type of resistive-type touch panel to be used.
- the main portion 16 a may include the signal lines 18 connected to electrodes 11 and 12 of the touch panel 9 along an upper or lower surface thereof.
- the main portion 16 a may include insulating and flexible material(s) to provide easy connection of the signal lines 18 .
- the extension may include epoxy or bakelite resin(s) and the end portions 16 b may be made to be relatively thin, thereby improving flexibility of the end portions 16 b .
- an end portion of the main portion 16 a may be formed having a relatively larger width as compared to a total width of the end portions 16 b , thereby providing a stable connection to a connection part 15 of the touch panel 9 .
- the end portions 16 b may be spaced apart from each other, thereby accommodating for soldering at the touch controller 23 (in FIG. 2 ).
- FIG. 7A is a cross sectional view along II-II′ of FIG. 6B according to the present invention
- FIG. 7B is a cross sectional view along III-III′ of FIG. 6B according to the present invention.
- the signal lines 18 may extend along an upper surface of the main portion 16 a .
- the signal lines 18 may extend along upper and lower surfaces of the end portion 16 b . Accordingly, contact areas of the signal lines 18 may increase, thereby preventing electric disconnection between the touch panel 9 (in FIG. 6A ) and the touch controller 23 (in FIG. 2 ).
- FIG. 8A is a plan view of an exemplary connection structure between an extension and controller according to the present invention.
- connection pads 22 may be provided for a touch controller 23 for signal transmission on a printer circuit board 28 , wherein the connection pads 22 may be positioned to correspond to the signal lines 18 of the extension 16 .
- the connection pad 22 may be formed having rectangular plate shapes of conductive material(s).
- the connection pads may have different geometries to accommodate corresponding numbers of the signal lines 18 .
- the connection pads 22 may be formed having opposing triangular shapes, circular shapes, and polygonal shapes.
- the connection pads 22 may have a hole to which the end portions 16 b may be inserted.
- connection pads 22 may be electrically connected to the touch controller 23 using wires 24 .
- conductive lines may be provided to electrically interconnect the connection pads 22 and the touch controller 23 .
- connection pads 22 may be formed to correspond to the signal lines 18 , wherein the signal lines 18 may be aligned along a lateral center line of the connection pads 22 .
- signal lines 18 corresponding to outer ones of the connection pads 22 may be offset from the lateral center line of the connection pads 22 .
- the connection pads 22 may not be provided such that the end portions 16 b may be electrically connected to a signal connection terminal (not shown) of the touch controller 23 using solder.
- FIG. 8B is a cross sectional view along IV-IV′ of FIG. 8A according to the present invention.
- each signal line 18 may have a first signal line portion that extends along the upper surface of the end portion 16 b , and a second signal line portion that extends along the lower surface of the end portion 16 b .
- the second signal line portion of the signal line 18 may be electrically connected to each connection pad 22 of the touch controller 23 using solder 26 on the printed circuit board 28 .
- the electric signal connection between each connection pad 22 of the touch controller 23 and each signal line 18 of the extension 16 of the touch panel 9 may be stabilized thereby obtaining a device having a thin profile and light weight.
- FIG. 9 is a plan view of an exemplary touch controller according to the present invention.
- the touch controller of FIG. 9 may incorporate one of the exemplary connection structures of FIGS. 3 and 6 A- 6 C.
- a touch panel (not shown) may be mounted at a front of an LCM 10 , and signal connections between an extension 16 and a touch controller 23 may be provided at region “A” at a rear of the LCM 10 .
- the extension 16 from the touch panel may be connected to a connection part of the touch controller 23 integrated with the rear of the LCM 10 using an ACF 25 (in FIGS. 3 and 5 ) or by soldering.
- the interconnection of the extension 16 and the touch controller 23 may be performed using a method similar to a process for bonding data driver ICs 42 onto a data driver area 40 and gate driver ICs 43 onto a gate driver area 41 .
- the adhesion process may be performed using a manually- or automatically-operated system.
Abstract
Description
- The present invention claims the benefit of Korean Patent Application Nos. P2002-71681 and P2002-72353 filed in Korea on Nov. 18, 2002 and Nov. 20, 2002, respectively, which are hereby incorporated by reference.
- 1. Field of the Invention
- The present invention relates to a touch panel system, and more particularly, to a touch panel system for a liquid crystal display (LCD) device.
- 2. Discussion of the Related Art
- Presently, liquid crystal display (LCD) devices are commonly used because of their ability to produce high quality images, as well as their thin profile, light weight, and low power consumption. Liquid crystal module (LCM) devices are used for displaying video signals input from external sources, such as LCD panels, and commonly include polarizing plates, power sources, such as backlight devices, and light-guiding plates. The LCD panels include upper and lower glass substrates, and liquid crystal material injected between the upper and lower glass substrates. In addition, the polarizing plates are formed on lower and upper surfaces of the LCD panel for polarizing light irradiated onto the LCD panel using the backlight device. Moreover, a printed circuit board (PCB) is provided below a main support at a rear of the LCM device, and a drive integrated circuit (D-IC) is provided on the PCB to drive switching devices (i.e., thin film transistors) of the LCM device. Accordingly, the LCM device is electrically connected to the PCB using a tape carrier package (TCP) so that the video signals of the D-IC are transmitted to the LCM device. Furthermore, a digitizer is provided in the LCD device to display images on a screen and to input electric graphic image signals thereon. The digitizer is commonly referred to as an electric graphic input panel (EGIP) or a touch panel. Due to rapid development of LCD technology, it is possible to perform graphic image work that requires high resolution on the LCD device, whereby the digitizer is used as an input device of a notebook computer.
-
FIG. 1 is a schematic cross sectional view of a touch panel according to the related art. InFIG. 1 ,transparent ITO electrodes films PET films film 5 is formed below thelower PET film 2 for polarizing light, and a triacetyl cellulose (TAC) film is formed below thePVA film 5 for protecting thePVA film 5 from humidity. In addition, a silver (A/G) layer is formed on theupper PET film 1. - An operation of the touch panel, which is categorized as a 4-line resistive-type touch panel, includes supplying a voltage to one transparent electrode along an X-axis direction, and supplying a voltage to another transparent electrode along a Y-axis direction. For example, a voltage is supplied to an upper
transparent electrode 3 along the X-axis direction, and a voltage is supplied to a lowertransparent electrode 4 along the Y-axis direction. Accordingly, signals are respectively supplied to the X-axis and the Y-axis in order to detect a location of a touching point in order to read the signals twice. For example, when the voltage is supplied to the uppertransparent electrode 3 along the X-axis direction, the upper and lowertransparent electrodes transparent electrode 4. Similarly, when the voltage is supplied to the lowertransparent electrode 4 along the Y-axis direction, the upper and lowertransparent electrodes transparent electrode 3. Accordingly, the upper and lowertransparent electrodes transparent electrodes - When a predetermined portion of the upper substrate is touched with a finger or a pen, the upper and lower
transparent electrodes transparent electrodes -
FIG. 2 is a plan view of a connection structure between an extension of a touch panel and a controller according to the related art. InFIG. 2 , atouch panel 9 includes two silver (A/G)electrodes 12 formed along left and right sides of anupper PET film 1 along the X-axis direction, and two A/G electrodes 11 formed along upper and lower sides of alower PET film 2 along the Y-axis direction. Accordingly, the A/G electrodes touch panel 9. Moreover, a size of thetouch panel 9 corresponds to sizes of an upper substrate of the LCD panel, wherein electrode lines of thetouch panel 9 are formed in a 4-line resistive-type configuration. - In order to operate the 4-line resistive-type touch panel, interconnect of the
touch panel 9, atouch controller 23, and a computer (i.e., CPU) using signal lines is required. A device in which thetouch panel 9 and thetouch controller 23 are connected to each other is referred to as a touch screen assembly. Thetouch controller 23 switches voltages and output signals provided to the upper and lower substrates of thetouch panel 9, and receives input location information as electric signals. Then, thetouch controller 23 converts the electric signal from analog signals to digital data, and transmits the digital data to the computer. Accordingly, thetouch controller 23 is positioned separately from the LCD device, which is integrated with the touch panel, i.e, thetouch controller 23 is positioned outside of the LCD device. - With the creation of ever smaller LCD devices having thin profiles and light weight to improve portability, integration of the LCD device with the touch controller is desired. For example, the touch controller can be mounted inside the LCD device, and the touch controller may be provided as a chip-type device positioned at rear of the LCM device.
- In
FIG. 2 , the A/G electrodes conductive lines touch panel 9. In addition, an extension of one of four sides of thetouch panel 9 provides aconnection part 15 that include end portions of theconductive lines conductive lines connection part 15. The FPCB 16 is used for electrically connecting theconductive lines G electrodes touch panel 9 to thetouch controller 23. - When the FPCB 16 of the
touch panel 9 is connected to thetouch controller 23, anFPCB connector 20 is mounted within thecontroller 23 so that aconnection part 17 of the FPCB 16 is inserted into theFPCB connector 20, thereby electrically interconnecting the A/G electrodes touch panel 9 to thetouch controller 23. Since the FPCB 16 is formed of soft material(s), a stiffener is provided with theconnection part 17 of the FPCB 16 for easy insertion of theconnection part 17 of the FPCB 16 to theFPCB connector 20. Accordingly, the signals output from the 4-line electrodes (A/G electrodes 11 and 12) of thetouch panel 9 are transmitted to thetouch controller 23 using the FPCB 16 that is inserted into theFPCB connector 20 of thetouch controller 23, thereby electrically interconnecting thetouch panel 9 to thetouch controller 23. - However, the signal connection structure between the touch panel and the touch controller according to the present invention has the following disadvantages. First, since the FPCB 16 of the
touch panel 9 is electrically connected to thetouch controller 23 by theFPCB connector 20, theFPCB connector 20 is thicker than IC chips below the LCM, whereby a total thickness of the entire interconnection system becomes thick. Thus, obtaining a thin profile and light weight of the LCD device is not achieved. Second, in order to connect the FPCB 16 of thetouch panel 9 to thetouch controller 23, theFPCB connector 20 is required, thereby increasing manufacturing costs. Third, when connecting the signal lines of the FPCB 16 to theFPCB connector 20, a connection failure may be generated. - Accordingly, the present invention is directed to a touch screen system and display device using a touch screen system that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
- An object of the present invention is to provide a touch screen system having a signal connection structure between a touch panel and a touch controller for obtaining a thin profile and light weight device.
- Another object of the present invention is to provide a display device having a touch screen system having a signal connection structure between a touch panel and a touch controller for obtaining a thin profile and light weight device.
- Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
- To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described, a touch screen system includes a touch panel to input image signals, a touch controller to drive the touch panel, an extension between the touch panel and the touch controller, and an anisotropic conductive film electrically interconnecting the extension to the touch controller.
- In another aspect, a touch screen system includes a touch panel to input image signals, a touch controller to drive the touch panel, and an extension having a plurality of signal lines to transmit electrical signals between the touch panel and the touch controller, wherein the extension includes a plurality of end portions that correspond to a total number of the signal lines connected to the touch controller.
- In another aspect, a touch screen system includes a touch panel having a plurality of electrodes, a touch controller having a plurality of contact pads, and an extension having a first portion physically connected to an end region of the touch panel, a second portion electrically connected to the touch controller, and a third portion disposed between the first and second portions, wherein the second portion of the extension includes a plurality of individual end portions electrically connected to the plurality of contact pads.
- In another aspect, a liquid crystal display device includes a liquid crystal module, a touch controller provided in a touch controller area at a first edge of the liquid crystal module, a plurality of data driver integrated circuits provide along a second edge of the liquid crystal module within a data driver area, a plurality of gate driver integrated circuits provided along a third edge of the liquid crystal module within a gate driver area, and an extension provided along the data driver area into the touch controller area.
- It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
- The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:
-
FIG. 1 is a schematic cross sectional view of a touch panel according to the related art; -
FIG. 2 is a plan view of a connection structure between an extension of a touch panel and a controller according to the related art; -
FIG. 3 is a plan view of an exemplary signal connection structure between an extension and controller connection part according to the present invention; -
FIG. 4 is a perspective view of an exemplary anisotropic conductive adhesive according to the present invention; -
FIG. 5 is a cross sectional view of an exemplary extension and controller connection part according to the present invention; -
FIG. 6A is a plan view of another exemplary connection structure between an extension of a touch panel and a controller according to the present invention; -
FIG. 6B is an enlarged view of “A” ofFIG. 6A according to the present invention; -
FIG. 6C is a cross sectional view along I-I′ ofFIG. 6A according to the present invention; -
FIG. 7A is a cross sectional view along II-II′ ofFIG. 6B according to the present invention; -
FIG. 7B is a cross sectional view along III-III′ ofFIG. 6B according to the present invention; -
FIG. 8A is a plan view of an exemplary connection structure between an extension and controller according to the present invention; -
FIG. 8B is a cross sectional view along IV-IV′ ofFIG. 8A according to the present invention; and -
FIG. 9 is a plan view of an exemplary touch controller according to the present invention. - Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
- A touch screen assembly according to the present invention will be described with reference to the accompanying drawings.
-
FIG. 3 is a plan view of an exemplary signal connection structure between an extension and controller connection part according to the present invention. InFIG. 3 , a plurality ofconnection pads 22 of atouch controller 23 may be formed on a PCB substrate having thetouch controller 23 contained therein, and an anisotropic conductive film (ACF) 25 may be formed on an upper surface of theconnection pads 22. In addition, anextension 16 may be provided to be connected to a touch panel, which may be similar to the touch panel 9 (ofFIG. 2 ), and may be formed on theACF 25. Accordingly, a plurality ofsignal lines 18 formed on theextension 16 may be connected to theconnection pads 22. Thus, thesignal lines 18 of aconnection part 17 of theextension 16 may be aligned to correspond to theconnection pads 22. TheACF 25 may include plastic material(s) coated with metal material(s). Alternatively, theACF 25 may include a film upon which conductive particles, such as metal particles, are scattered, thereby simultaneously providing electric signal connection and adhesion. -
FIG. 4 is a perspective view of an exemplary anisotropic conductive adhesive according to the present invention. InFIG. 4 ,conductive particles 30, such as metal particles, may be scattered in anadhesive film 31 formed of thermoplastic or thermosetting resin(s), thereby forming theACF 25. Then, although not shown, a first conductive terminal may be formed on a front surface of theACF 25 and a second conductive terminal may be formed on a rear surface of theACF 25. Accordingly, pressure may be applied to theACF 25 so that the first conductive terminal is electrically connected to the second conductive terminal by theconductive particles 30. Next, as shown inFIG. 3 , theACF 25 may be positioned between theextension 16 of the touch panel 9 (inFIG. 2 ) and theconnection pads 22 of thetouch controller 23 to electrically interconnect theextension 16 and theconnection pads 22. Thus, current may flow between theextension 16 and theconnection pads 22. -
FIG. 5 is a cross sectional view of an exemplary extension and controller connection part according to the present invention. InFIG. 5 , theextension 16 may be formed to bond to theconnection pads 22 of thetouch controller 23. Since theACF 25 may be inserted between theextension 16 of the touch panel 9 (inFIG. 2 ) and theconnection pads 22 of the touch controller 23 (inFIG. 3 ), then thesignal lines 18 of the extension 16 (inFIG. 3 ) may be aligned to correspond to theconnection pads 22. Next, pressure and heat may be applied to theextension 16 andcontroller connection pads 22, so that an adhesive 31 of theACF 25 melts. Accordingly, the scatteredconductive particles 30 of theACF 25 may be pressed between eachsignal line 18 of theextension 16 and eachconnection pad 22. Thus, theconductive particles 30 may be in electrical and physical contact with thesignal lines 18 and theconnection pads 22, thereby ensuring sufficient electrical conduction. In addition, the adhesive 31 may be electrically charged between adjacent ones of the signal lines 18, except at portions where theconductive particles 30 are present. Accordingly, theconductive particles 30 may be separately positioned, thereby obtaining high electrical insulating characteristics. Accordingly, adhesive reliability of theACF 25 may be significantly affected by the performance of theconductive particles 30 and the adhesive 31. - Since the
ACF 25 may provide electrical interconnect between the plurality ofsignal lines 18 and theconnection pads 22, accurate positioning of the plurality ofsignal lines 18 with respect to theconnection pads 22 may be necessary. For example, if the plurality ofsignal lines 18 are not accurately positioned with respect to theconnection pads 22, interconnection between the touch panel 9 (inFIG. 2 ) and the touch controller 23 (inFIG. 3 ) may not be properly made. Accordingly, the touch controller 23 (inFIG. 3 ) may be mounted on a PCB that may include theconnection pads 22. - In
FIG. 3 , theconnection pads 22 may be formed in thetouch controller 23 to correspond to thesignal lines 18 of theextension 16. Accordingly, when thetouch controller 23 is provided at a rear portion of an LCM, thetouch controller 23 and theconnection pads 22 may be mounted on a source or gate PCB at the rear of the LCM. In addition, a fixingguide 50 may be provided for fixing the location of theextension 16 to provide correct signal connection between eachconnection pad 22 and eachsignal line 18 of theextension 16. The fixingguide 50 may be formed in a shape of “U” so that theconnection part 17 of theextension 16 may be fixed by the fixingguide 50. However, the fixingguide 50 may not be limited to a U-shape, and may have variable lengths and thicknesses. For example, the fixingguide 50 may be formed to have a first thickness corresponding to a total thickness of theACF 25 and a second thickness corresponding to a thickness of theextension 16. - In
FIG. 3 , theconnection part 17 of theextension 16 that opposes thetouch controller 23 may be formed to electrically contact thesignal lines 18 using theACF 25. Accordingly, theconnection part 17 of theextension 16 may havesignal lines 18 that extend from an upper surface to a lower surface for surrounding theconnection part 17 of theextension 16. Alternatively, thesignal lines 18 may be formed only along the surface that opposes a connection part of thetouch controller 23. Alternatively, theACF 25 may be electrically connected between thesignal lines 18 of theextension 16 to theconnection pads 22 of thetouch controller 23 using a permanent connection, such as solder. -
FIG. 6A is a plan view of an exemplary connection structure between an extension of a touch panel and a controller according to the present invention,FIG. 6B is an enlarged view of “A” ofFIG. 6A according to the present invention, andFIG. 6C is a cross sectional view along I-I′ ofFIG. 6A according to the present invention. InFIGS. 6A, 6B , and 6C, theextension 16 may includeend portions 16 b that may be divided into a plurality offinger portions 19 that may correspond to a plurality ofsignal lines 18, and amain portion 16 a. Although fourend portions 16 b are shown, any number ofend portions 16 b may be provided that correspond to the type of resistive-type touch panel to be used. Accordingly, themain portion 16 a may include thesignal lines 18 connected toelectrodes touch panel 9 along an upper or lower surface thereof. Themain portion 16 a may include insulating and flexible material(s) to provide easy connection of the signal lines 18. For example, the extension may include epoxy or bakelite resin(s) and theend portions 16 b may be made to be relatively thin, thereby improving flexibility of theend portions 16 b. In addition, an end portion of themain portion 16 a may be formed having a relatively larger width as compared to a total width of theend portions 16 b, thereby providing a stable connection to aconnection part 15 of thetouch panel 9. Moreover, theend portions 16 b may be spaced apart from each other, thereby accommodating for soldering at the touch controller 23 (inFIG. 2 ). -
FIG. 7A is a cross sectional view along II-II′ ofFIG. 6B according to the present invention, andFIG. 7B is a cross sectional view along III-III′ ofFIG. 6B according to the present invention. InFIG. 7A , thesignal lines 18 may extend along an upper surface of themain portion 16 a. InFIG. 7B , thesignal lines 18 may extend along upper and lower surfaces of theend portion 16 b. Accordingly, contact areas of thesignal lines 18 may increase, thereby preventing electric disconnection between the touch panel 9 (inFIG. 6A ) and the touch controller 23 (inFIG. 2 ). -
FIG. 8A is a plan view of an exemplary connection structure between an extension and controller according to the present invention. InFIG. 8A ,connection pads 22 may be provided for atouch controller 23 for signal transmission on aprinter circuit board 28, wherein theconnection pads 22 may be positioned to correspond to thesignal lines 18 of theextension 16. Accordingly, theconnection pad 22 may be formed having rectangular plate shapes of conductive material(s). Alternatively, the connection pads may have different geometries to accommodate corresponding numbers of the signal lines 18. For example, theconnection pads 22 may be formed having opposing triangular shapes, circular shapes, and polygonal shapes. In addition, theconnection pads 22 may have a hole to which theend portions 16 b may be inserted. - In
FIG. 8A , theconnection pads 22 may be electrically connected to thetouch controller 23 usingwires 24. Alternatively, conductive lines may be provided to electrically interconnect theconnection pads 22 and thetouch controller 23. In addition, theconnection pads 22 may be formed to correspond to the signal lines 18, wherein thesignal lines 18 may be aligned along a lateral center line of theconnection pads 22. However,signal lines 18 corresponding to outer ones of theconnection pads 22 may be offset from the lateral center line of theconnection pads 22. Alternatively, theconnection pads 22 may not be provided such that theend portions 16 b may be electrically connected to a signal connection terminal (not shown) of thetouch controller 23 using solder. -
FIG. 8B is a cross sectional view along IV-IV′ ofFIG. 8A according to the present invention. InFIG. 8B , eachsignal line 18 may have a first signal line portion that extends along the upper surface of theend portion 16 b, and a second signal line portion that extends along the lower surface of theend portion 16 b. Accordingly, the second signal line portion of thesignal line 18 may be electrically connected to eachconnection pad 22 of thetouch controller 23 usingsolder 26 on the printedcircuit board 28. Accordingly, the electric signal connection between eachconnection pad 22 of thetouch controller 23 and eachsignal line 18 of theextension 16 of thetouch panel 9 may be stabilized thereby obtaining a device having a thin profile and light weight. -
FIG. 9 is a plan view of an exemplary touch controller according to the present invention. The touch controller ofFIG. 9 may incorporate one of the exemplary connection structures ofFIGS. 3 and 6 A-6C. InFIG. 9 , a touch panel (not shown) may be mounted at a front of anLCM 10, and signal connections between anextension 16 and atouch controller 23 may be provided at region “A” at a rear of theLCM 10. Accordingly, theextension 16 from the touch panel may be connected to a connection part of thetouch controller 23 integrated with the rear of theLCM 10 using an ACF 25 (inFIGS. 3 and 5 ) or by soldering. In addition, the interconnection of theextension 16 and thetouch controller 23 may be performed using a method similar to a process for bondingdata driver ICs 42 onto adata driver area 40 andgate driver ICs 43 onto agate driver area 41. Thus, the adhesion process may be performed using a manually- or automatically-operated system. - It will be apparent to those skilled in the art that various modifications and variations can be made in touch panel system of the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (17)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/882,864 US20070273672A1 (en) | 2002-11-18 | 2007-08-06 | Touch screen system and display device using the same |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KRP2002-71681 | 2002-11-18 | ||
KR10-2002-0071681A KR100480824B1 (en) | 2002-11-18 | 2002-11-18 | Touchscreen Assembly |
KRP2002-72353 | 2002-11-20 | ||
KR10-2002-0072353A KR100510722B1 (en) | 2002-11-20 | 2002-11-20 | Touchscreen Assembly |
US10/701,638 US7253808B2 (en) | 2002-11-18 | 2003-11-06 | Touch screen system and display device using the same |
US11/882,864 US20070273672A1 (en) | 2002-11-18 | 2007-08-06 | Touch screen system and display device using the same |
Related Parent Applications (1)
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US10/701,638 Division US7253808B2 (en) | 2002-11-18 | 2003-11-06 | Touch screen system and display device using the same |
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US20070273672A1 true US20070273672A1 (en) | 2007-11-29 |
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ID=32301930
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US10/701,638 Active 2025-04-22 US7253808B2 (en) | 2002-11-18 | 2003-11-06 | Touch screen system and display device using the same |
US11/882,864 Abandoned US20070273672A1 (en) | 2002-11-18 | 2007-08-06 | Touch screen system and display device using the same |
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US10/701,638 Active 2025-04-22 US7253808B2 (en) | 2002-11-18 | 2003-11-06 | Touch screen system and display device using the same |
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CN103403653A (en) * | 2011-02-23 | 2013-11-20 | Nec卡西欧移动通信株式会社 | Electronic device |
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US20080053713A1 (en) * | 2006-08-30 | 2008-03-06 | High Tech Computer Corp. (A Legal Entity Of Taiwan) | Touch-sensitive input device and electronic device incorporating the touch-sensitive input device |
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JP6322555B2 (en) * | 2014-11-26 | 2018-05-09 | 株式会社ジャパンディスプレイ | Detection device and display device with detection function |
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Also Published As
Publication number | Publication date |
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US7253808B2 (en) | 2007-08-07 |
US20040095334A1 (en) | 2004-05-20 |
CN1501314A (en) | 2004-06-02 |
CN1269013C (en) | 2006-08-09 |
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Legal Events
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AS | Assignment |
Owner name: LG.PHILIPS LCD CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HONG, HEE JUNG;REEL/FRAME:019719/0784 Effective date: 20031115 |
|
AS | Assignment |
Owner name: LG DISPLAY CO., LTD., KOREA, REPUBLIC OF Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021754/0230 Effective date: 20080304 Owner name: LG DISPLAY CO., LTD.,KOREA, REPUBLIC OF Free format text: CHANGE OF NAME;ASSIGNOR:LG.PHILIPS LCD CO., LTD.;REEL/FRAME:021754/0230 Effective date: 20080304 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |