WO2006013760A1 - バックライト装置及び液晶表示装置 - Google Patents
バックライト装置及び液晶表示装置 Download PDFInfo
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- WO2006013760A1 WO2006013760A1 PCT/JP2005/013734 JP2005013734W WO2006013760A1 WO 2006013760 A1 WO2006013760 A1 WO 2006013760A1 JP 2005013734 W JP2005013734 W JP 2005013734W WO 2006013760 A1 WO2006013760 A1 WO 2006013760A1
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- WIPO (PCT)
- Prior art keywords
- plate
- light emitting
- light
- liquid crystal
- reflection
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133628—Illuminating devices with cooling means
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/46—Fixing elements
- G02F2201/465—Snap -fit
Definitions
- the present invention relates to a liquid crystal display device including a transmissive liquid crystal display device (LCD) and a backlight device used in the liquid crystal display device.
- LCD transmissive liquid crystal display device
- backlight device used in the liquid crystal display device.
- a liquid crystal display device has a larger display screen, lighter weight, thinner thickness, lower power consumption, and the like compared with a cathode ray tube (CRT: Cathode_Ray Tube).
- CRT Cathode_Ray Tube
- a self-luminous PDP P1 asma Display Panel
- a liquid crystal display device encapsulates liquid crystal between two transparent substrates of various sizes, changes the light transmittance by changing the direction of liquid crystal molecules by applying a voltage between electrodes provided on the transparent substrate, and changes the light transmittance. These images are optically displayed.
- the liquid crystal display device since the liquid crystal itself is not a light emitter, a light source for entering illumination light into the liquid crystal panel is provided.
- a light source that employs a sidelight method in which illumination light is incident from the side of the back side of the liquid crystal panel or a knock light method in which the back side force illumination light of the liquid crystal panel is directly incident is used.
- the backlight unit having a light source in which illumination light is also incident on the back side of the liquid crystal panel includes a light source, a light guide plate that guides the emitted illumination light to the liquid crystal panel, and a reflection light source.
- a sheet and a lens sheet or a diffusion sheet are provided, and the illumination light emitted from the light source force is incident on the entire surface of the liquid crystal panel.
- a cold cathode fluorescent lamp in which mercury or xenon is enclosed in a fluorescent tube is used.
- CCLF cold cathode fluorescent lamp
- Such a backlight unit has a low emission luminance of a cold cathode fluorescent lamp used as a light source and a short lifetime, and also has a low luminance region on the cathode side, resulting in uniformity and the like. It has problems such as not being secured.
- an area light type backlight (Area Litconfiguration Backlight) in which a plurality of long cold-cathode fluorescent lamps are arranged on the back of the diffusion plate so that display light is incident on the liquid crystal panel. )
- a device is provided. Even in such an area light type backlight device, there is a problem caused by the above-described cold cathode fluorescent lamp, and particularly when applied to a large-sized television receiver exceeding 30 inches, it is possible to increase the brightness and increase the brightness. The problem of uniformity is becoming more prominent.
- LED three primary light red, green and blue light emitting diodes
- a light source used in an LED backlight device there are also provided a light source in which a large number of LEDs are arranged in a matrix pattern and a light source in which a large number of LEDs are arranged in an array.
- An array-type LED backlight device forms a light-emitting unit body by mounting a number of LEDs on the same axis on the wiring board described above, and arranges a plurality of light-emitting unit bodies on the same axis.
- a light emitting array is formed, and a plurality of light emitting arrays are arranged at equal intervals to form a light emitting unit.
- a powerful LED backlight device when large-capacity illumination light emitted from a large number of LED powers is directly incident on the liquid crystal panel via the light guide plate, color irregularities and lamp images are displayed on the liquid crystal panel. May cause.
- a light diffusing plate is arranged between the light guide plate and the light emitting unit body, and the light emitted from each LED is restricted from direct incidence in the area facing each LED, Once reflected, control the amount of incident light and transmit it in the surrounding area.
- LED backlight devices use so-called side-emission LEDs that have directivity that emits emitted light mainly in the outer circumferential direction, and each LED force emits emitted light in the surrounding area. plate Averaged so that it is incident on
- the LED backlight device combines the light emitting unit body with a reflective plate so that illumination light can be efficiently incident on the liquid crystal panel.
- the LED backlight device reflects the outgoing light reflected by the light diffusion plate by the reflection plate and the outgoing light emitted in the outer peripheral direction and makes it incident on the light diffusion plate.
- a large number of guide holes corresponding to each LED are formed on the reflection plate, and the LED light emitting part projects from the guide holes toward the liquid crystal panel.
- a reflective plate obtained by applying a resin coating to a base material made of a foaming PET (polyethylene terephthalate) plate containing an fluorescent agent or an aluminum plate is used.
- This reflection plate is formed in a size approximately the same as the liquid crystal panel.
- the LED backlight device is provided with a sealed space portion on the back surface portion of the liquid crystal panel to prevent leakage of illumination light to the outside, and the above-described many LEDs and each plate are arranged in the sealed space portion. ing.
- the LED backlight device with such a configuration will accumulate heat generated by many LED forces in the sealed space.
- the reflecting plate expands and the size of each optical component constituting the device changes, and the relative size of each LED and each guide hole provided in the reflecting plate changes. Deviations in position accuracy will occur.
- the LED backlight device has variations in the dimensional accuracy of the wiring board, the mounting accuracy of each LED, the dimensional accuracy of the back panel, the assembly accuracy of each light emitting unit body and the reflection plate, etc., due to the configuration of the light emitting array as described above. Force This greatly affects the relative position accuracy between each LED and each guide hole provided in the reflective plate with which these LEDs are engaged.
- the LED backlight device is equipped with a large number of LEDs as the liquid crystal panel becomes larger, the reflector plate is larger, and a number of guide holes corresponding to the larger number of LEDs are provided.
- each constituent member is made high, and each constituent member is assembled with high accuracy, so that a large number of LEDs due to heat generation and the reflection that these LEDs engage.
- the effect of positional deviation from each guide hole provided in the plate is suppressed.
- each guide hole provided in the reflection plate has a larger diameter than the size of the LED so as to absorb the positional deviation with each LED engaged therewith. In this way, if each guide hole is enlarged, a large gap is created between this LED and the LED to be engaged. The illumination light leaks from the gap to the back side, reducing the light utilization efficiency. Therefore, it is necessary to take a light shielding measure to shield the light leaking to the back side, and the structure becomes complicated.
- the reflector plate needs to be sized according to the size of the LED backlight device, and when the LED backlight device is enlarged, the plate itself needs to be large.
- a reflection plate formed of an aluminum plate is used.
- the surface of the aluminum plate that constitutes the reflection plate is coated with a synthetic resin, which is an insulating material, in order to achieve electrical insulation. Even if the insulating material is coated on the surface of the aluminum plate in this way, if a guide hole that engages with the LED is subsequently drilled, the aluminum that is the base material is exposed on the inner peripheral surface of the guide hole.
- An object of the present invention is to solve the above-described problems and to provide a backlight device and a liquid crystal display device capable of improving the utilization efficiency of light emitted from light source power and performing bright image display. To do.
- the present invention improves the light utilization efficiency by suppressing the leakage of the light guide space force of the outgoing light emitted from each light emitting diode while facilitating the processing of each constituent member and the assembly of each constituent member.
- An object of the present invention is to provide a backlight device and a liquid crystal display device that achieve the above.
- the backlight device comprises a plurality of light emitting unit bodies, each having a plurality of light emitting diodes mounted on the same axis on a wiring board, arranged on the same axis to form a light emitting array, and an optical sheet block A plurality of light emitting arrays are arranged at equal intervals on the back surface of the transmissive liquid crystal panel via the illuminating light, and incident illumination light is incident.
- the knock light device includes a plurality of reflecting sheet pieces and a reflecting plate that are mounted on a heat radiating plate that supports each of the wiring boards and constitutes each light emitting array.
- the heat radiating plate is formed of a metal material having thermal conductivity, and on the main surface of the base portion, the wiring board is formed on a same axis and supported in a longitudinal direction.
- a reflection plate receiving portion is formed along both sides of the fitting portion.
- Each reflection sheet piece is formed of a sheet material having reflection characteristics, has a length corresponding to a predetermined number of light emitting diodes, and includes a rectangular piece that is smaller than the width of the heat dissipation plate.
- a large number of guide holes that penetrate the light emitting portion of the photodiode are provided on the same axis.
- the reflection plate is formed by a plate material having reflection characteristics and is approximately the same size as the outer shape of the liquid crystal panel, and a plurality of rows of guide openings that penetrate the light emitting portions of the respective light emitting diodes at positions corresponding to the respective light emitting arrays. A part is formed.
- Each reflective sheet piece is assembled to the heat radiating plate with the light emitting part of the light emitting diode projecting from each guide hole, and the reflective plate is superimposed on each reflective sheet piece to the reflective plate receiving part of each heat radiating plate. Be joined.
- Each light emitting diode protrudes from the guide opening portion of the reflection plate through each guide hole in which each light emitting portion is formed in each reflection sheet piece, and faces the back surface portion of the liquid crystal panel. Further, the reflection plate joined to the heat radiating plate holds each reflection sheet piece to prevent the outgoing light emitted from each light emitting diode from leaking to the back side.
- the reflection sheet pieces are assembled for each light emitting unit body, so that the processing accuracy and assembly of the guide holes of the reflection sheet pieces and the light emitting diodes engaged with the guide holes are increased. Leakage of the light guide hole from the light emitting diode can be prevented without requiring high accuracy.
- a heat pipe fitting portion is formed in the base portion of each heat radiating plate over the entire length direction, and the heat pipe is attached to the fitting portion while maintaining a close contact state with the inner wall.
- the heat generated from each light emitting diode through the heat pipe is efficiently conducted to the heat radiating means through each heat radiating plate to radiate heat.
- a dustproof elastic material that seals the board mating part is joined to the reflection plate receiving part provided on the side of the heat dissipation plate.
- Each dustproof elastic material prevents the entry of dust or the like into the board fitting portion by closing the open side portion of the board fitting portion that supports the wiring board.
- Each guide opening formed in the reflecting plate corresponding to each light-emitting array has a plurality of guides that are located on the same axis and divided into lengths that allow a plurality of light-emitting diodes to pass through the bridge portion. It is constituted by an opening.
- the reflection sheet piece is assembled to each wiring board by passing the light emitting diode through each guide hole, and by joining the reflection plate on the reflection plate receiving part of each heat radiating plate, each bridge part of the reflection plate becomes a reflection sheet piece. Press against the heat dissipation plate to prevent it from lifting.
- the reflective sheet piece is formed of an insulating synthetic resin sheet material, and the reflective plate is formed using an aluminum base material.
- the inner peripheral edge of each guide hole formed in each reflective sheet piece having a diameter smaller than that of the opening on the inner peripheral edge of each guide opening facing the aluminum base material that constitutes the reflection plate Combined to protrude in the direction.
- a part of each reflecting sheet piece protrudes from the inner peripheral edge of each guide opening of the reflecting plate, so that each reflecting sheet piece forms the reflecting plate between the aluminum base and the terminal portion of each light emitting diode.
- a liquid crystal display device includes a transmissive liquid crystal panel, a backlight unit that includes a plurality of light emitting diodes, and that inputs a large amount of illumination light from the light emitted from each light emitting diode to the liquid crystal panel;
- An optical conversion unit that performs predetermined optical conversion processing on the illumination light and enters the liquid crystal panel, a light guide unit that enters the illumination light emitted from the backlight unit in a uniform state on the liquid crystal panel, and each light emission
- a reflection part that reflects the emitted light emitted from the diode toward the periphery toward the light guide part and a heat dissipation part that radiates heat generated in the backlight part are provided.
- a plurality of light emitting diodes are mounted on the same axis on a wiring board to form a light emitting unit body, and a plurality of light emitting unit bodies are arranged at equal intervals on the same axis on the back surface of the liquid crystal panel.
- the optical conversion unit is configured by a functional optical sheet laminate formed by laminating a plurality of functional optical sheets disposed between the liquid crystal panel and the backlight unit, and is polarized to a component orthogonal to the illumination light.
- the illumination light emitted from the backlight unit is incident on the liquid crystal panel in a stable state with functions such as correcting the function and phase difference to achieve a wide-angle viewing field and preventing coloring, and a diffusion function.
- the light guide unit includes a diffusion light guide plate and a light diffusion plate disposed on the back surface of the optical conversion unit.
- the diffusion light guide plate is formed to have a slight thickness by, for example, milky white light guide grease, and is incident on the optical conversion unit in a state where the entire surface force is averaged by diffusing the incident illumination light inside. To do.
- the light diffusion plate selectively performs a reflection / diffusion operation and a transmission operation with respect to the illumination light to make the luminance uniform, and enters the diffusion light guide plate.
- the light diffusing plate is formed of, for example, a transparent resin material, and a plurality of light adjusting portions having light reflecting and diffusing properties are formed at portions facing each light emitting diode. The light diffusing plate regulates the amount of outgoing light emitted from each light emitting diode directly below by each dimming unit, thereby suppressing the occurrence of a partial high-brightness region. Light enters the diffusion light guide plate.
- the heat dissipating part is made of a metal material having thermal conductivity, and a plurality of heat dissipating plates in which a board fitting part is formed on the main surface of the base part to place the wiring boards on the same axis and support them in the length direction.
- Each heat dissipating plate constitutes a support member for the light emitting unit body, and is arranged on the same axis line at equal intervals on the back surface of the liquid crystal panel to form heat dissipating plates respectively corresponding to a plurality of light emitting arrays.
- Each heat dissipating plate is formed with a standing wall-like reflecting plate receiving portion along both sides of the board fitting portion, and the reflecting plate is joined to the reflecting plate receiving portion.
- Each heat dissipating plate has a groove-shaped heat pipe fitting part located on the same axis line in the longitudinal direction on the bottom surface of the base part where the board fitting part is formed. Respectively.
- Each heat radiation plate is assembled with a heat pipe in close contact with the inner wall in the heat pipe fitting portion, and heat generated from each light emitting diode is conducted to the heat radiation means by this heat pipe.
- the reflection part is the light emitted from each light emitting diode and the light diffusion plate.
- the outgoing light reflected by the light control unit is reflected to the light guide unit.
- the reflecting portion includes a large number of reflecting sheet pieces provided for each wiring board, and a reflecting plate formed to have a size substantially equal to the outer shape of the liquid crystal panel.
- Each reflecting sheet piece is formed in a rectangular piece shape having substantially the same length as a wiring board on which a predetermined number of light emitting diodes are mounted and a width slightly smaller than the width of the heat radiating plate by a sheet material having a reflection characteristic. ing.
- Each reflection sheet piece is provided with a large number of guide holes on the same axis so as to penetrate the light emitting portions of the respective light emitting diodes.
- Each reflecting sheet piece is assembled to the heat radiating plate by protruding the light emitting portion of the light emitting diode, which also faces each guide hole, and the reflecting plate is superimposed on each reflecting sheet piece to receive the reflecting plate receiving portion of each radiating plate. It is joined to the reflector to form a reflection part.
- the plurality of light emitting diodes, in which the guide hole caps formed in the respective reflection sheet pieces are also protruded, are exposed to the back surface portion of the liquid crystal panel with the respective light emitting portions protruding from the guide opening force.
- Heat generated from a large number of light emitting diodes is dissipated through a heat dissipating plate having a function of supporting the wiring board. Further, the heat pipe is attached to the heat pipe fitting portion formed over the entire length direction at the base portion of each heat radiating plate while maintaining close contact with the inner wall, and is generated from each light emitting diode. Conducts heat conducted to the heat dissipation plate to the heat dissipation means.
- Each guide opening formed on the reflection plate corresponding to each light emitting array is a plurality of guide openings that are located on the same axis and divided into lengths that allow a predetermined number of light emitting diodes to pass through each bridge. Is provided. In the state where the reflection plate is joined to a large number of reflection plate receiving portions formed on the heat dissipation plate, each bridge portion presses each reflection sheet piece to the heat dissipation plate side to prevent lifting.
- the reflective sheet piece is formed of an insulating synthetic resin sheet material, and the reflective plate is formed using an aluminum base material.
- the inner peripheral edge of each guide opening facing the aluminum base material of the reflection plate On the inner peripheral edge of each guide hole of each reflecting sheet piece having a smaller diameter than each guide opening extends inward over the entire circumference. Protruded and combined. Therefore, each reflective sheet piece is a portion where the aluminum base material of the reflective plate faces. The electrical insulation between the minute and the terminal of each light emitting diode is maintained.
- the backlight device according to the present invention and the liquid crystal display device using the backlight device are designed so that a large volume of illumination light is uniformly incident from the backlight portion even in a large liquid crystal panel. Brightness image display can be performed, the processing accuracy of each component member is made high, and even if the assembly accuracy of each component member is not maintained with high accuracy, the illumination light emitted from each light-emitting diode can be displayed. It is possible to display light with high brightness by suppressing leakage and improving light utilization efficiency.
- FIG. 1 is an exploded perspective view of a principal part showing a transmissive liquid crystal display device to which the present invention is applied.
- FIG. 2 is a longitudinal sectional view of a principal part of the transmissive liquid crystal display device. is there.
- FIG. 3 is a plan view showing a light guide part, a backlight part, and a reflection part, partly cut away.
- FIG. 4 is an exploded perspective view of a main part showing a light emitting unit body of a backlight unit, a reflection plate of a reflection unit, and a reflection sheet piece.
- FIG. 5 is a vertical cross-sectional view of a main part showing a light emitting unit body of a backlight unit, a reflection plate of a reflection unit, and a reflection sheet piece.
- Fig. 6 is a longitudinal sectional view of a main part showing a light guide portion and an optical stud member.
- liquid crystal display device a transmissive liquid crystal color liquid crystal display device (hereinafter simply referred to as a liquid crystal display device).
- the liquid crystal display device 1 is used in, for example, a television receiver or a display monitor device having a large display screen of 30 inches or more.
- the liquid crystal display device 1 includes a liquid crystal panel unit 2 and a backlight unit 3 that emits a large amount of illumination light combined with the back side of the liquid crystal panel unit 2. ing. Then, between the liquid crystal panel unit 2 and the backlight unit 3, the light is emitted from the knock light unit 3.
- An optical conversion unit 4 that performs predetermined optical conversion processing on the illumination light and enters the liquid crystal panel unit 2, a light guide unit 5 that enters the illumination light in a uniform state on the liquid crystal panel unit 2, and a backlight unit.
- the reflector 6 that reflects the illumination light emitted from 3 toward the surroundings and reflects it toward the light guide 5 and the heat dissipator 7 that dissipates the heat generated in the backlight 3 are arranged. .
- the liquid crystal panel unit 2 has a liquid crystal panel 8 with a large display screen size of 30 inches or more. As shown in FIG. 2, the outer peripheral edge of the liquid crystal panel 8 is sandwiched between the frame-shaped front frame member 9 and the holder frame member 10 via the spacer 11, the guide member 12, and the like. It is supported.
- a cover glass is attached to the front side of the liquid crystal panel 8.
- the liquid crystal panel 8 is not described in detail, but the opposing glass is maintained by spacer beads or the like.
- the second glass on which a transparent common electrode is formed is the same as the first glass substrate on which a transparent segment electrode is formed. Liquid crystal is sealed between the substrates, and the light transmittance is changed by changing the orientation of the liquid crystal molecules by an electric field generated by applying a voltage between the electrodes formed on each glass substrate.
- a striped transparent electrode, an insulating film, and an alignment film are formed on the inner surface of the first glass substrate.
- three primary color filters, an overcoat layer, a striped transparent electrode, and an alignment film are formed on the inner surface of the second glass substrate of the liquid crystal panel 8.
- the liquid crystal panel 8 has alignment films made of polyimide that are aligned in the horizontal direction with the liquid crystal molecules serving as an interface.
- the deflection film and the retardation film are achromatic and whitened in wavelength characteristics, and are fully colored by color filters. Received images are displayed in color for unification.
- the liquid crystal panel 8 used in the present invention is not limited to the liquid crystal panel configured as described above, and liquid crystal panels having various configurations conventionally provided can be used.
- a backlight unit 3 is assembled on the back side of the liquid crystal panel unit 2 described above. Have been combined.
- the knock light unit 3 is disposed so as to face the entire surface of the liquid crystal panel unit 2, and constitutes a light guide space 14 that is optically sealed together with the liquid crystal panel unit 2.
- the backlight unit 3 includes a predetermined number of light emitting unit bodies 15 arranged on the same axis to form a light emitting array 16, and a plurality of light emitting arrays 16 arranged in parallel to each other at predetermined intervals. Yes.
- the knock light unit 3 forms a light emitting array 16 for one row by arranging three light emitting unit bodies 15 in a row in the length direction. 6 rows are arranged in parallel in the height direction.
- each light emitting unit body 15 constituting the knock light unit 3 includes a wiring board 17, a plurality of LEDs 18 mounted on the wiring board 17, an input connector 19, and an output connector. Composed of 20 mag.
- each LED 18 has a light emitting part 18a held by a resin holder 18b and a pair of terminals 18c drawn from the resin holder 18b.
- each LED 18 uses a so-called side emission type LED having directivity for emitting the main component of the emitted light toward the outer periphery of the light emitting portion 18a.
- the number of light emitting unit bodies 15 and the number and interval of the LEDs 18 mounted on each of the light emitting unit bodies 15 are appropriately determined according to the size of the liquid crystal panel 8, the light emission capability of each LED 18, and the like.
- all the wiring boards 17 are formed with the same specifications, and although not shown, the wiring patterns for connecting the LEDs 18 in series to the wiring boards 17 and the land for connecting the terminals of the LEDs 18 are connected. Etc. are formed.
- an input connector 19 is mounted in the vicinity of one side in the width direction and positioned on one side, and an output connector 20 is mounted on the other side.
- each light emitting array 16 has the light emitting unit bodies 15 arranged in the same row with the wiring boards 17 in the same direction.
- the light emitting array 16 has the first, third and The light-emitting array in the fifth odd-numbered row arranges each light-emitting unit body 15 so that each wiring board 17 has its one edge on the side where the input connector 19 and output connector 20 are mounted facing downward. To do.
- the light-emitting array 16 has an even-numbered light-emitting array force in the second row, the fourth row, and the sixth row.
- Each side of the wiring board 17 is mounted on the side where the input connector 19 and the output connector 20 are mounted.
- the light emitting unit bodies 15 are arranged so that is directed upward.
- each light emitting array 16 is arranged in the same row so that the input connector 19 and the output connector 20 of each wiring board 17 adjacent to each light emitting unit body 15 face each other.
- each light emitting array 16 is arranged in an odd number column and an even number column so that the input connector 19 and the output connector 20 of each wiring board 17 to which each light emitting unit body 15 is opposed are opposed to each other.
- Each light emitting array 16 is connected in series by a lead wire with a connector, and each light emitting unit 15 is not shown in the figure, but as described above, the input connector 19 and the output connector 20 are connected. As a result, the shortest wiring between the light emitting unit bodies 15 is performed.
- Each light emitting array 16 has an input connector 19 positioned on the right end side of the light emitting unit body 15 arranged on the right side of each odd-numbered column, and outputs to the left end side of the light emitting unit body 15 arranged on the left side.
- Connector 20 is positioned and arranged.
- each light emitting array 16 has an output connector 20 positioned on the left end side of the light emitting unit body 15 arranged on the left side in each even number column, and the right end side of the light emitting unit body 15 arranged on the right side.
- the input connector 19 is positioned and arranged.
- lead wires are routed using a space in the length direction formed between odd-numbered columns and even-numbered columns. The lead wire is inserted into each space through a drawer opening (not shown) formed on the knock panel 13 and bowed out to each space. Bundled.
- the knocklight unit 3 holds the lead wires using the spaces formed between the light emitting arrays 16 and guides them, thereby improving the space efficiency and simplifying the wiring process.
- the knock light section 3 the wrong combination of the light emitting unit bodies 15 is identified in the same row and between rows depending on the positions of the input connector 19 and the output connector 20 mounted on each wiring board 17. become.
- Each light emitting array 16 is designed to simplify the wiring structure and wiring process between the wiring boards 17 or to share the lead wires.
- the optical conversion unit 4 has an optical sheet laminate in which a plurality of optical sheets having an outer shape substantially equal to the outer shape of the liquid crystal panel 8 are stacked.
- the optical conversion unit 4 compensates for the phase difference of the illumination light, an optical function sheet in which the optical function sheet stack is not described in detail, but decomposes the illumination light incident from the backlight unit 3 into orthogonal polarization components.
- a plurality of optical function sheets having various optical functions such as an optical function sheet for widening the viewing angle and preventing coloring or an optical function sheet for diffusing illumination light.
- the optical conversion unit 4 includes an optical functional sheet laminate that is combined with the main surface of the diffused light guide plate 21 of the light guide unit 5 described later, and a holding bracket member 22 that is assembled to the back panel 13. And arranged on the back side of the liquid crystal panel 8 with a predetermined facing distance.
- the optical conversion unit 4 is not limited to the above-described optical functional sheet laminate, but as other optical functional sheets, for example, a luminance improving film for improving luminance, and two diffusions on the upper and lower sides sandwiching a retardation film and a prism sheet. Provide an optical function sheet such as a sheet.
- the light conversion unit 4 guides the illumination light incident from the knock light unit 3 through the light guide space unit 14 in a state of uniform brightness over the entire surface by the light guide unit 5.
- the light guide 5 is composed of a diffusion light guide plate 21 and a diffusion plate 23, and is arranged in the light guide space 14 while being held at a predetermined distance by an optical stud member 25 as will be described in detail later. Is done.
- the diffusion light guide plate 21 has a plate strength that is substantially the same size and slightly thick as the liquid crystal panel 8 formed from a milky white synthetic resin material having light guide properties, such as acrylic resin or polycarbonate resin.
- the diffused light guide plate 21 is combined with the optical functional sheet laminate of the optical conversion unit 4 on one main surface, and the outer peripheral portion is held by the holding bracket member 22.
- the diffusion light guide plate 21 diffuses the illumination light incident from the other main surface by appropriately refracting and irregularly reflecting inside, and from the one main surface side to the entire surface. In order to make the luminance uniform over a period of time, the light is incident on the optical conversion unit 4.
- the diffusion plate 23 has substantially the same physical strength as the liquid crystal panel 8 formed of a transparent synthetic resin material such as acrylic resin, and is disposed to face the knock light portion 3 with a predetermined interval. Thus, it has a function of controlling the incident state of the emitted light emitted from each LED 18.
- dimming patterns 24 are formed at portions facing the light emitting portions 18a of the LEDs 18, respectively.
- Each dimming pattern 24 is configured by printing a circular pattern having a slightly larger diameter than the light emitting portion 18a of the LED 18 with ink having light reflection and diffusion characteristics.
- Each dimming pattern 24 uses an ink prepared by mixing an ink material containing a light shielding agent and a diffusing agent at a predetermined ratio, and is precisely formed by, for example, a screen printing method or the like.
- ink for example, titanium oxide, barium sulfide, calcium carbonate, acid alumina, zinc oxide, nickel oxide, calcium hydroxide, lithium sulfide, iron trioxide, methacrylic resin powder , Mica (sericite), porcelain clay powder, kaolin, bentonite, gold powder or pulp fiber.
- a diffusing agent for example, acid cane, glass beads, glass fine powder, glass fiber, liquid silicon, crystal powder, gold-coated resin beads, cholesteric liquid crystal liquid, recrystallized acrylic resin powder, etc. Is used.
- the diffusing plate 23 reflects the component emitted directly upward from the emitted light emitted from the light emitting portion 18a of the LED 18 in which each dimming pattern 24 is arranged immediately below.
- the diffusing plate 23 makes the emitted light incident in a region where each light control pattern 24 is not formed, that is, a region not directly facing each light emitting array 16. In this way, the diffuser plate 23 regulates the outgoing light that is emitted from each LED 18 by each dimming pattern 24 and directly enters it, thereby reducing the occurrence of partial high-brightness areas and making the brightness uniform. Light is incident on the entire surface of the light diffusing light guide plate 21.
- the diffuser plate 23 is configured by a large number of dots formed in a region having a larger diameter than the light emitting portion 18a of the LED 18 so that each dimming pattern 24 transmits a part of the emitted light and a part thereof.
- the amount of incident light may be limited by reflecting and diffusing.
- the dimming plate 23 limits the amount of incident light at the central portion and the position of the LED 18 by adjusting the density of the dots 24 so that the density of the dots is higher than that of the peripheral portion. It can be configured as a so-called gradation pattern that absorbs misalignment.
- the use of the side emission type LED 18 causes a phenomenon in which the illumination light is condensed in the region between the light emitting arrays 16, so that each dimming pattern 24 is formed vertically. You can suppress the occurrence of this phenomenon!
- the outgoing light emitted from each LED 18 and incident on the diffusion plate 23 beyond the critical angle is reflected on the surface of the diffusion plate 23.
- the outgoing light emitted from each LED 18 of the knocklight unit 3 to the surroundings, the outgoing light reflected by the surface of the diffusion plate 23, or the outgoing light reflected by each dimming pattern 24 is reflected by the reflecting unit 6.
- the light efficiently enters the light guide 5 through the diffusion plate 23.
- the reflector 6 improves the reflectivity based on the principle of increased reflection by repeatedly reflecting light to and from the diffuser plate 23.
- the reflecting section 6 includes one large reflecting plate 26 and a large number of reflecting sheet pieces 27 provided for each light emitting unit body 15.
- the reflecting plate 26 is positioned by the heat radiating plate 28 and the optical stud member 25 constituting the heat radiating portion 7 and is combined with the backlight portion 3, and each reflecting sheet piece is formed by the reflecting plate 26. 27 is retained.
- the reflection plate 26 has a relatively high surface accuracy with no distortion, and is formed as a large-sized member that is substantially the same shape as the liquid crystal panel 8 that is combined with the light guide portion 5 while maintaining a certain facing distance. Therefore, a certain degree of mechanical rigidity is required. Therefore, the reflection plate 26 is formed by bonding, for example, an expandable PET material 30 containing a fluorescent agent on the surface of a plate 29 made of aluminum.
- the reflection plate 26 may be a stainless steel plate having a mirror surface as well as an aluminum-made plate.
- the reflection plate 26 may be formed of, for example, foaming PET containing a fluorescent agent. Foaming PET is lightweight, has high reflectivity characteristics of about 95%, and has features such as scratches on the reflecting surface with a color tone different from that of metallic glossy colors, and is a conventional liquid crystal display. It is also used in equipment.
- the reflection plate 26 has six rows of guide openings corresponding to each light emitting array 16 as shown in FIG. A mouth 31 is formed.
- each guide opening 31 is formed by a plurality of horizontally long unit guide openings 32a to 32n (collectively referred to as unit guide openings 32) which are located on the same axis and divided by the bridge portion 33, respectively. Composed.
- Each unit guide opening 32 is formed to have a length sufficient to penetrate each of the five LEDs 18 whose opening width is slightly larger than the outer diameter of the light emitting portion 18a of the LED 18.
- the guide opening 31 is not limited to the structure that applies force, and may be configured by one opening having a length corresponding to the entire length of each light emitting array 16.
- the guide opening 31 functions as a part where each bridge portion 33 retains the mechanical rigidity of the reflection plate 26 and also holds the reflection sheet piece 27 as described later. It is preferable that the LED 18 is formed with a certain interval enough to penetrate the LED 18.
- the reflection sheet piece 27 is made of a material having high reflection characteristics such as the above-described foaming PET material, and is substantially the same length as each wiring board 17 and has a slightly larger width than the width of the heat radiation plate 2. It is formed in a rectangular piece having a slightly smaller width.
- 25 guide holes 34 are formed so as to correspond to the 25 LEDs 18 provided on the light emitting unit bodies 15 on the same axis.
- Each guide hole 34 is formed in the reflection sheet piece 27 so as to be aligned on the same axis line in the longitudinal direction, and each of the guide holes 34 is a circular hole having an inner diameter substantially equal to that of the light emitting portion 18a of each LED 18.
- the reflection sheet piece 27 is combined for each light emitting unit body 15 with the wiring board 17 supported by the heat radiating plate 28 through the light emitting portions 18a of the LEDs 18 facing each other through the guide holes 34.
- the reflection sheet piece 27 is formed in a size corresponding to each light emitting unit body 15 and can be accurately positioned with each LED 18 facing from each guide hole 34 by being directly combined with the wiring board 17. Is possible. Therefore, the reflection sheet piece 27 is protruded from each guide hole 34 in a state where the outer peripheral portion of the light emitting portion 18a of each LED 18 is in close contact with the inner peripheral wall thereof.
- the reflection sheet piece 27 is formed to have a width substantially the same as or slightly smaller than the board fitting recess 38 of the heat radiating plate 28, which will be described later.
- the reflecting portion 6 has a reflecting sheet piece 27 for each light emitting unit body 15 passing through the light emitting portions 18a of the respective LEDs 18 facing from the respective guide holes 34 to the wiring board 17.
- the reflection plate 26 is superimposed on each reflection sheet piece 27 and fixed on each heat radiation plate 28 as will be described in detail later.
- the light emitting portion 18a of the LED 18 passes through each guide opening 31 and faces the diffusion plate 23. .
- each reflecting sheet piece 27 is formed of an insulating foaming PET material
- the reflecting plate 26 is formed of a laminate of an aluminum plate 29 and a foaming PET material 30.
- each reflection sheet piece 27 also serving as an insulating material has a small diameter.
- Each guide hole 34 has a structure in which the inner peripheral edge protrudes inward over the entire periphery. Therefore, in the reflection portion 6, electrical insulation is maintained between the portion of the reflection plate 26 where the aluminum base material faces and the terminal 18 c of each LED 18 by each reflection sheet piece 27.
- the reflection plate 26 is assembled.
- the reflection plate 26 is fixed on the heat dissipation plate 28 to hold the reflection sheet piece 27 against the heat dissipation plate 28.
- the reflection plate 26 is divided into the unit guide openings 32 through which the five LEDs 18 protrude through the bridge portions 33 to form the guide openings 31. Therefore, each bridge portion 33 presses each reflection sheet piece 27 at a predetermined interval with respect to the length direction, so that these reflection sheet pieces 27 are more securely held, and the reflection sheet pieces 27 are lifted, vibrated, etc. Therefore, the structure for preventing the occurrence of this is unnecessary, and the assembly can be simplified.
- the reflecting portion 6 has the same size as the liquid crystal panel 8 and the supporting plate 13a or the optical stud member formed on the back panel 13 as shown in FIG. Positioned through 25 and combined with the backlight unit 3.
- the reflecting plate 26 is configured by a circular hole that penetrates each LED 18 one by one through the guide opening 31 like the reflecting sheet piece 27, the reflecting plate 26 is positioned with respect to the LED 18. It becomes extremely difficult.
- the reflection part 6 forms the reflection plate 26 with high dimensional accuracy.
- the need for positioning and assembling each component with high accuracy significantly increases the cost of manufacturing high-precision parts and assembly process, and causes distortion in the reflection plate 26 due to thermal changes. End up.
- the reflection part 6 of the present embodiment is configured by combining the reflection plate 26 and a large number of reflection sheet pieces 27, so that it is possible to prevent a gap from occurring in the outer peripheral part of each LED 18, and each LED 18 It is possible to prevent a part of the emitted light emitted from the light from leaking to the back side through the gap in the outer peripheral portion, thereby improving the light efficiency and performing the display with high luminance.
- the reflection unit 6 can simplify the structure by eliminating the need for a structure that shields leaked light from the back side.
- the reflecting portion 6 of the present embodiment is configured by combining the reflecting plate 26 and a large number of reflecting sheet pieces 27, and the light emitting portion of each LED 18 is provided in the guide hole 34 formed in each reflecting sheet piece 27. Since the 18a is inserted and closely contacted, the emitted light emitted from each LED 18 is prevented from leaking to the back side from the gap between the inner peripheral wall of the guide hole 34 and the outer peripheral portion of the light emitting portion 18a. .
- the liquid crystal display device 1 of the present embodiment when the surface luminance of the reflection plate 26 of the reflecting portion 6 configured as described above was measured, a result of 6135 cdZm 2 was obtained at the center luminance. On the other hand, in the conventional liquid crystal display device that does not have the reflection sheet piece 27, the surface luminance of the reflection plate measured by the same method was 5716 cdZm 2 . Therefore, it was confirmed that the liquid crystal display device 1 of the present embodiment can improve the luminance by about 7%.
- the reflecting sheet piece 27 constituting the reflecting portion 6 is a force that is formed to be combined for each light emitting unit body 15 and has a size that combines two or three according to the size of the light emitting unit body 15. It may be formed or may be formed in a size that can be combined across a plurality of light emitting unit bodies 15. However, if the reflective sheet piece 27 is too large, the reflective portion 6 becomes difficult to precisely align the guide holes 34 and the LED 18, and the effect of the laminated structure described above cannot be achieved. It is formed in a predetermined size.
- a large number of optical stud members 25 are attached to the back panel 13, and the above-described optical conversion unit 4 is configured via these optical stud members 25.
- the optical function sheet body, the diffusion light guide plates 21 and 23 constituting the light guide 5 and the reflection plate 26 constituting the reflection part 6 are positioned with respect to each other and parallelism between the opposing principal surfaces Is configured to be held with high accuracy over the entire surface. In the liquid crystal display device 1, color unevenness and the like are prevented by maintaining the distance and parallelism between the large plates.
- fitting holes 23a and 26a are formed in the diffusion plate 23 and the reflection plate 26 described above for combination with the optical stud member 25. These fitting holes 23a and 26a are formed between the rows of the light emitting arrays 16 in the state where the diffusing plate 23 and the reflecting plate 26 are combined, and are formed so that their axes coincide with each other.
- Each optical stud member 25 is a member formed integrally with a milky white synthetic resin material having light guide property, mechanical rigidity, and a certain degree of elasticity, such as polycarbonate resin, as shown in FIGS. 2 and 6.
- Each is attached to a mounting portion 35 formed integrally with the back panel 13.
- the back panel 13 is formed with a large number of mounting portions 35 that are formed integrally with a substantially trapezoidal convex portion on the inner surface side.
- the attachment portion 35 has an upper surface that constitutes the placement surface of the diffusion plate 23, and is provided with attachment holes 35 c penetrating each other.
- the attachment portion 35 is formed so as to be positioned between the columns of the light emitting arrays 16 in a state where the backlight portion 3 described above is combined with the back panel 13.
- each optical stud member 25 has a shaft-like base portion 25a, a fitting portion 25b formed at the tip of the shaft-like base portion 25a, and a predetermined distance from the fitting portion 25b.
- a flange-shaped first receiving plate portion 25c formed integrally around the circumference of the shaft-shaped base portion 25a, and an integral portion around the circumference of the shaft-shaped base portion 25a with a predetermined interval from the first receiving plate portion 25c.
- a flange-shaped second receiving plate portion 25d formed in the above.
- Each optical stud member 25 has a shaft-like base portion 25a formed with an axial length that defines the facing distance between the mounting portion 35 of the back panel 13 and the diffusion light guide plate 21, and has a predetermined height from the second receiving plate portion 25d. A step 25e is formed at this position.
- Each optical stud member 25 has a long-axis cone whose axial base portion 25a has a slightly larger diameter than the fitting hole 23a in which the step portion 25e is formed in the diffusion plate 23, and whose diameter gradually decreases toward the tip portion. It is formed in a shape.
- Each optical stud member 25 has a shaft-like base portion 25a and a step portion 25e.
- a hole 25f for forming an elastically displaceable portion is formed in a part of the base portion 25a, located slightly above the base portion.
- the punch hole 25f is formed in the shaft-like base portion 25a over a range in which the outer diameter is larger than the fitting hole 23a of the diffusion plate 23.
- Each optical stud member 25 is a first receiving plate.
- Each optical stud member 25 has a shaft-like base portion 25a formed with the first receiving plate portion 25c and the second receiving plate portion 25d at substantially the same diameter as the fitting hole 23a of the diffusion plate 23.
- Each optical stud member 25 has a fitting portion 25b whose outer diameter is substantially equal to the outer diameter of the mounting hole 35a formed in the mounting portion 35 on the back panel 13 side.
- the cross section gradually becoming larger than the inner diameter of the hole 35a has a substantially truncated cone shape.
- Each optical stud member 25 is given converging habits when the fitting portion 25b forms a split 25g by applying the large-diameter region force toward the tip side.
- Each optical stud member 25 is formed such that the distance between the large diameter portion of the fitting portion 25a and the first receiving plate portion 25c is substantially equal to the sum of the thickness of the back panel 13 and the thickness of the diffusion plate 23.
- Each optical stud member 25 has a first receiving plate portion 25c having a diameter slightly larger than the inner diameter of the fitting hole 23a of the diffusion plate 23, and a second receiving plate portion 25d having a fitting hole 26a of the reflection plate 26.
- the inner diameter is slightly larger than the inner diameter.
- the reflection plate 26 is in a state where the mounting hole 35a is opposed to the mounting hole 35a formed in the mounting part 35 in a state where the heat radiating part 7 and the backlight part 3 are assembled to the knock panel 13. And assembled on the mounting portion 35 of the knock panel 13. In this state, each optical stud member 25 is also assembled to each attachment portion 35 with the inner surface side force of the back panel 13. In each optical stud member 25, the fitting portion 25 b is pushed into the attachment hole 35 a of the attachment portion 35 through the fitting hole 26 a of the reflection plate 26.
- Each optical stud member 25 is converged by the action of the slit 25g when the fitting portion 25b passes through the mounting hole 35a and returns to the natural state after passing through, thereby preventing the optical stud member 25 from falling on the mounting portion 35. It can be assembled upright.
- each optical stud member 25 is connected to each optical stud member 25 as shown in FIG. Is sandwiched in the thickness direction between the fitting portion 25b and the first receiving plate portion 25c.
- the reflection plate 26 is held in a state where the reflection plate 26 is positioned with respect to the back panel 13, and each reflection sheet piece 27 is positioned and held with high accuracy.
- each optical stud member 25 protrudes from the first receiving plate portion 25c of the shaft-like base portion 25a so as to protrude from the reflecting plate 26 and protrude onto the mounting portion 35 of the back panel 13.
- each optical stud member 25 is combined with each optical stud member 25 by fitting the respective fitting holes 23a from the opposite tip portions 25h.
- Each of the optical stud members 25 is allowed to move over the step portion 25e of the diffusion plate 23 that is pushed in the axial direction by causing the large-diameter portion to converge by the action of the extraction hole 17f.
- the large diameter portion returns to the natural state, and the step portion 25e and the second receiving plate portion 25d
- the diffusion plate 23 is sandwiched in the thickness direction.
- each optical stud member 25 projects an upper side portion from the second receiving plate portion 25d of the shaft-like base portion 25a from the diffusion plate 23, respectively.
- a diffusion light guide plate 21 on which the optical function sheet laminate of the optical conversion unit 4 is superimposed is assembled to the distal end portion 25h of each optical stud member 25 so that the bottom surface side of the diffusion light guide plate 21 abuts.
- each optical stud member 25 is assembled on the mounting portion 35 of the back panel 13 by a simple method of pushing the fitting portion 25b into the mounting hole 35a.
- Each optical stud member 25 positions the diffusing plate 23 and the reflecting plate 26, and maintains the facing distance between the diffusing plate 23, the reflecting plate 26, the diffusing light guide plate 21, and the optical conversion unit 4 with high accuracy.
- a complicated positioning structure and spacing structure can be eliminated, and the assembly process can be simplified.
- Each optical stud member 25 is a liquid crystal panel of various sizes. 8 can be used interchangeably, and parts can be shared.
- the specific structure of each part is suitably changed based on the structure of the liquid crystal display device 1 which is not limited to the structure mentioned above.
- the optical stud member 25 is formed in the mounting hole 35a of the knock panel 13 by, for example, forming a slit 25g in the fitting portion 25b to enable elastic displacement. Force that is pushed in and attached.For example, a protrusion is integrally formed on the outer periphery, and after fitting in the mounting hole 35a having a key groove on the inner periphery, it is rotated to prevent it from coming off. It may be.
- Each of the plates described above is precisely positioned by the optical stud member 25, so that the plate is in a stable state with respect to illumination light in the light guide space portion 14 formed between the liquid crystal panel 8 and the backlight portion 3. Realizes light guide, diffusion, reflection, etc., and prevents color unevenness in the liquid crystal panel 8.
- the optical stud member 25 is formed of milky white light-transmitting synthetic resin material as described above, thereby diffusing the illumination light incident on the outer peripheral surface and the tip 25h partially By preventing the light from being illuminated, the illumination light can be uniformly incident on the diffusion light guide plate 21 from the light guide space 14.
- the above-mentioned optical stud members 25 are located between the respective light emitting arrays 16 with respect to the knock panel 13, and five in the horizontal direction and three in the vertical direction are attached.
- the diffuser plate 23 with the light control pattern 24 and the reflective plate 26 joined with the aluminum plate 29 and the foamable PET material 30 have different characteristics on the front and back surfaces. Need to be combined. It must be.
- the diffusing plate 23 and the reflecting plate 26 have fitting holes 23a and 26a through which the shaft-like base portion 25a of the optical stud member 25 penetrates in the horizontal direction corresponding to the mounting positions of the optical stud members 25. 15 in total, 3 in the vertical direction. As shown in FIG.
- the second optical stud member 25A from the left side of the lower row is erected on the back panel 13 at a different position from the optical stud members 25 on the upper row side.
- the second fitting holes 23a, 26a from the left side of the lower row relative to the optical stud member 25A are positioned with the respective fitting holes 23a, 26a on the upper row side.
- the fitting holes 23a and 26a do not exist at positions facing the optical stud member 25A, so the optical stud member 25 is used. Cannot be combined.
- the fitting holes 23a and 26a of the optical stud member 25A, the diffusion plate 23, and the reflection plate 26 constituting the erroneous combination prevention structure may be provided at any position other than the center position. However, it is desirable to provide it at the inner peripheral position rather than the outer peripheral side so that the members can be combined in a stable state.
- the knock light unit 3 is provided with a large number of LEDs 18 so that a large amount of illumination light is incident on the liquid crystal panel unit 2 to enable high luminance display. At this time, the heat generated from each LED 18 is stored in the light guide space 14 that is sealed between the liquid crystal panel unit 2 and the backlight unit 3 and is not radiated to the outside.
- the temperature inside the device 1 becomes high, the characteristics of each optical function sheet of the optical conversion unit 4 change, the lighting state of each LED 18 becomes unstable, and color unevenness occurs in the liquid crystal panel 8, In addition, the operation of the electronic parts constituting the circuit unit is made unstable, or a large dimensional change is caused in each constituent member.
- the heat radiating section 7 includes a heat radiating plate 28 that also serves as a mounting member for each of the light emitting unit bodies 15 described above, a heat pipe 36 that is combined with the heat radiating plate 28, and a heat pipe 36 that is connected to the end of the heat pipe 36 to receive heat conduction.
- the heat sink 37 disposed on the back side of the panel 13 or a cooling fan (not shown) that promotes the cooling function of the heat sink 37 is configured.
- Each heat-dissipating plate 28 is provided for each of the six light-emitting arrays 16 and is made of an aluminum material having excellent thermal conductivity, good heat resistance, light weight, and low cost. It is formed in the shape of a long rectangular plate substantially equal to the length and width. Each heat dissipating plate 28 also serves as an attachment member to which the three light emitting unit bodies 15 are attached, and thus is formed with a predetermined thickness having mechanical rigidity. Each of the heat dissipation plates 28 is not limited to an aluminum material, and may be formed of, for example, an aluminum alloy material, a magnesium alloy material, a silver alloy material, a copper material, or the like having good thermal conductivity.
- each heat radiation plate 28 may be formed by an appropriate processing method such as a press force check or a cutting cover. As shown in FIG. 5, each heat dissipation plate 28 has three wiring boards 17 constituting the light emitting body 15 with the first main surface 28a as a mounting surface, but the end surfaces in the length direction of each are abutted against each other. Installed in a state. Each heat radiating plate 28 is formed with a board fitting concave portion 38 in which the wiring board 17 is fitted to the first main surface 28a over the entire length.
- Each heat dissipation plate 28 is a board
- the fitting recess 38 is formed to have substantially the same width as the wiring board 17 and a height slightly larger than the thickness thereof, and the bottom of the fitted wiring board 17 and both side edges in the width direction are formed. Hold.
- Each heat dissipating plate 28 fixes the wiring board 17 fitted in the board fitting recess 38 with a plurality of mounting screws 39.
- Each heat-dissipating plate 28 is formed with a receiving projection 38a in the length direction in which the bottom surface of the wiring board 17 is closely attached by leaving the central region in the width direction as a projection having a predetermined width in the substrate fitting recess 38.
- concave portions 38b and 38c are formed over the entire length in the length direction along both sides of the receiving convex portion 38a.
- each heat radiation plate 28 is formed with a width corresponding to the LED mounting area where each LED 18 of the wiring board 17 is mounted, as shown in FIG.
- the LED mounting area force also ensures that heat is transferred efficiently and heat is dissipated.
- each heat-dissipating plate 28 may be configured to have a concave portion 38b, 38c in order to reduce weight and maintain dimensional accuracy.
- the concave portion 38b, 38c may also be configured as a heat pipe fitting portion.
- Each of the heat radiating plates 28 is integrally formed with reflecting plate receiving portions 40, 40 along the both sides of the opening edge of the board fitting recess 38 over the entire length direction.
- the reflection plate receiving portions 40, 40 also have plate-like part forces that protrude in the width direction from the opening edge of the board fitting recess 38 of the heat radiating plate 28, respectively, and as a whole, as shown in FIG.
- the main surface 28a is set to be larger than the width of the reflecting sheet piece 27.
- the reflection plate receiving portions 40, 40 protrude the light emitting portions 18 a of the respective LEDs 18 from the respective guide holes 34, and engage both side edges of the reflection sheet pieces 27 combined with the light emitting unit body 15.
- the reflection plate receiving portions 40 and 40 support both sides of the reflection sheet piece 27 when the reflection sheet piece 27 is formed with a width larger than the opening width of the substrate fitting recess 38.
- the reflection plate receiving portions 40, 40 are formed so as to hold the reflection sheet piece 27 combined in this case at a height position at which the light emitting portion 18a of each LED 18 protrudes from the corresponding guide hole 34.
- the six heat dissipating plates 28 are attached to the inner surface of the back panel 13 at a predetermined interval.
- Each heat-dissipating plate 28 has three light-emitting unit bodies 15 formed by mounting a predetermined number of LEDs 18 on a wiring board 17 in a board-engaging recess 38, and mounting members for six rows of light-emitting arrays 16 are attached. Constitute. In the heat dissipating part 7, each light emission In a state where the reflection sheet pieces 27 are assembled to the unit bodies 15, the reflection plates 26 constituting the reflection section 6 are assembled so as to cover the heat dissipation plates 28.
- the inner surface of the reflection plate 26 is pressed against each of the heat radiating plates 28 on the respective reflection plate receiving portions 40, 40. Double-sided adhesive tapes 41, 41 are bonded to the heat radiating plates 28 over the entire length of the reflection plate receiving portions 40, 40 in advance, and the inner surfaces of the pressed reflection plates 26 are bonded and fixed.
- the reflection plate 26 supports the outer peripheral portion on the support portion 13a formed on the back panel 13 as described above, and is held by the optical stud member 25 in the region between the light emitting arrays 16, and further constitutes each light emitting array 16. Even in the region of the heat radiating plate 28 to be held, it is held by the reflecting plate receiving portions 40 and 40.
- the reflection plate 26 is positioned with high accuracy by a powerful structure and is combined with no distortion.
- each heat radiating plate 28 constituting the heat radiating portion 7 functions as a mounting member for the light emitting unit body 15 of the knock light portion 3, and also functions as a mounting member for the reflecting plate 26 constituting the reflective portion 6. Since each of the heat radiating plates 28 functions as a mounting member for the reflecting plate 26, the reflecting plate 26 can be positioned and supported with high accuracy, can be supported, light efficiency can be improved, and color unevenness can be prevented. Further, the reflection plate 26 can be extremely easily combined with each heat radiation plate 28.
- the reflection plate 26 is bonded by the double-sided adhesive tapes 41 and 41 bonded to the reflection plate receiving portions 40 and 40 of the heat radiating plates 28.
- the reflection plate receiving portions 40 and 40 are connected.
- the reflective plate 26 may be fixed by an adhesive applied on the top.
- each heat dissipating plate 28 has the board fitting recess 38 in a substantially sealed structure on the main surface side to ensure dust resistance. Be beaten!
- the board fitting recess 38 is formed in the entire length in the length direction of the heat radiating plate 28 and has a structure in which both end surfaces of the heat radiating plate 28 are opened.
- heat dissipation plate 2 As shown in FIG. 4, a dust-proof member 43 formed of, for example, foamed urethane resin or sponge material is joined on the reflection plate receiving portions 40 provided on both sides of 8. Since the open portions at both ends of the board fitting recess 38 are closed by the dust-proof member 43, dust and the like can be prevented from entering the board fitting recess 38, thereby improving the dust resistance.
- each heat dissipation plate 28 has a heat pipe fitting recess 42 in which the heat pipe 36 is fitted on the second main surface 28 b side facing the first main surface 28 a, A plurality of mounting studs and positioning dowels that form a mounting portion with the back panel 13 are integrally formed.
- the heat pipe fitting recess 42 is a cross-section that is located at a substantially central portion in the width direction and opens over the entire length direction on the second main surface 28b facing the receiving projection 38a on the first main surface 28a side. However, it also has a substantially arch-shaped concave groove force.
- the heat pipe fitting concave portion 42 has an opening width substantially equal to the outer diameter of the heat pipe 36, and is formed with convex ridges 42a and 42b on the opening portion.
- a heat pipe 36 is assembled in each heat pipe fitting recess 42 in each heat radiation plate 28.
- the opening force of the heat pipe fitting recess 42 is also assembled inside, and as shown in FIG. 5, the crimping process is performed so as to close the opening against the crimping convex edges 42a and 42b.
- the outer peripheral portion is assembled in a state of being in close contact with the inner wall of the heat pipe fitting recess 42.
- Each heat pipe 36 is assembled over the entire length to a portion facing the mounting region of the LED 18 with respect to each heat radiating plate 28, so that efficient heat radiation is performed.
- each heat radiation plate 28 also serves as a holding member for the heat pipe 36. In addition to simplifying the mounting structure of the heat pipe 36, it is possible to easily handle the heat pipe 36 precisely during assembly and to prevent bending and breakage. Since each heat radiating plate 28 combines the light emitting unit body 15 and the heat pipe 36 in a state of being positioned and close to each other, it is efficient between the light emitting unit body 15 and the heat pipe 36. Constructs a heat conduction path. Each heat radiating plate 28 is attached to the knock panel 13 in a state where the light emitting unit bodies 15 are assembled in the board fitting recesses 38 and the heat pipes 36 are assembled in the heat pipe fitting recesses 42. It is positioned and fixed with high accuracy via a tad or positioning dowel. Each heat radiating plate 28 may be fixed to the inner surface of the back panel 13 by using a mounting screw 39 for fixing the wiring board 17.
- each heat radiating plate 28 the heat pipe fitting recess 38 opened in the second main surface 28b of each heat radiating plate 28 is formed and the heat pipe 36 is assembled, but the structure is not limited to this.
- a heat pipe fitting hole opened at at least one end in the longitudinal direction may be formed, and the heat pipe 36 may be assembled inside from the side surface direction.
- the heat pipe 36 is a member generally used for conducting heat conduction to the heat radiating means even when the power source part is heated at various electronic devices, and is a metal pipe such as copper having excellent heat conductivity. It is constructed by enclosing a conductive medium such as water that is vaporized at a predetermined temperature while the material is exhausted, and has a highly efficient heat conduction capability. As described above, the heat pipe 36 is integrally assembled with each heat radiating plate 28, and both ends of each heat pipe 36 are connected to the heat sink 37. In the heat pipe 36, the conduction medium enclosed inside receives heat conduction from the high-temperature side heat radiating plate 28 and vaporizes from liquid to gas.
- the vaporized conduction medium force pipe flows to the connection portion with the low-temperature heat sink 37 and is cooled, thereby releasing condensation heat and liquidizing.
- the liquid-conducted conductive medium moves to the heat radiation plate 28 side by a capillary phenomenon in the longitudinal grooves and the porous layer formed on the inner wall of the metal pipe. As a result of this circulation, high-efficiency heat conduction is achieved.
- the heat sinks 37 are mounted on the back surface of the back panel 13 on both sides in the length direction.
- the heat sink 37 is also used alone or in combination with the heat pipe 36 as a heat radiating member for a power supply unit in various electronic devices, etc., but a detailed description is omitted, but a large number of fins are made of an aluminum material having excellent thermal conductivity. Are integrally formed.
- the heat sink 37 has a large surface area, and the high-temperature portion side force is also subjected to heat conduction to dissipate the surface force of each fin, thereby cooling the high-temperature portion.
- the heat sink 37 is a large and heavy part. For example, when mounting directly on a wiring board, etc., the mounting bracket member that retains insulation from circuit components and wiring patterns, etc., requires a heat conduction member that is interposed between the high-temperature part and the structure is complicated.
- a large heat sink 37 is skillfully arranged on the back panel 13 using a large number of heat dissipating plates 28 and heat pipes 36 to constitute the heat dissipating section 7, thereby suppressing the increase in size and the back. It is configured to efficiently dissipate heat generated from the light section 3.
- the knock panel 13 is formed in a flat shape as a whole. make it possible.
- heat sinks 37 are mounted on both sides of the back surface of the flat back panel 13 so that a flat portion is formed in the central region of the back panel 13.
- the knock panel 13 is formed into a member having a size slightly larger than the outer shape of the liquid crystal panel 8 by using, for example, an aluminum material that is relatively light and has mechanical rigidity.
- the back panel 13 itself has thermal conductivity, and thus has a function of dissipating heat generated from the light guide space 14 and circuit components.
- the back panel 13 is formed with the outer peripheral wall portion that combines the front frame member 9 and the holder frame member 10 at the outer peripheral portion, and the mounting portion for attaching the optical stud member 25 and the heat radiating plate 28. Alternatively, a lead-out opening for drawing out the lead wire and a crossing portion are formed.
- the liquid crystal display device 1 includes a liquid crystal controller that outputs an operation control signal to the liquid crystal panel 8, a power control unit that controls the liquid crystal panel 8 and the power supply unit, or an operation of the backlight unit 3.
- a control circuit package such as an LED control unit is installed.
- the knock panel 13 also serves as a mounting panel for these control circuit packages and the like, and is appropriately mounted on the back side although not shown.
- various control circuit packages and the like are mounted on a control board arranged in a flat region formed in the center portion by arranging heat sinks 37 on both sides.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/595,264 US7324174B2 (en) | 2004-08-04 | 2005-07-27 | Backlight device and liquid crystal display apparatus |
KR1020067006430A KR101161465B1 (ko) | 2004-08-04 | 2005-07-27 | 백라이트 장치 및 액정 표시 장치 |
Applications Claiming Priority (2)
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JP2004-228625 | 2004-08-04 | ||
JP2004228625A JP4543813B2 (ja) | 2004-08-04 | 2004-08-04 | バックライト装置及びこのバックライト装置を備えた液晶表示装置 |
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WO2006013760A1 true WO2006013760A1 (ja) | 2006-02-09 |
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PCT/JP2005/013734 WO2006013760A1 (ja) | 2004-08-04 | 2005-07-27 | バックライト装置及び液晶表示装置 |
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US (1) | US7324174B2 (ja) |
JP (1) | JP4543813B2 (ja) |
KR (1) | KR101161465B1 (ja) |
CN (1) | CN100462810C (ja) |
WO (1) | WO2006013760A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
US7324174B2 (en) | 2008-01-29 |
CN1842737A (zh) | 2006-10-04 |
KR101161465B1 (ko) | 2012-07-02 |
US20070103908A1 (en) | 2007-05-10 |
JP2006049098A (ja) | 2006-02-16 |
KR20070042907A (ko) | 2007-04-24 |
JP4543813B2 (ja) | 2010-09-15 |
CN100462810C (zh) | 2009-02-18 |
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