US20210011327A1 - Display device - Google Patents
Display device Download PDFInfo
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- US20210011327A1 US20210011327A1 US16/918,539 US202016918539A US2021011327A1 US 20210011327 A1 US20210011327 A1 US 20210011327A1 US 202016918539 A US202016918539 A US 202016918539A US 2021011327 A1 US2021011327 A1 US 2021011327A1
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- United States
- Prior art keywords
- adhesive tape
- chassis
- liquid
- protrusions
- display device
- 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.)
- Granted
Links
- 239000002390 adhesive tape Substances 0.000 claims abstract description 71
- 238000005286 illumination Methods 0.000 claims abstract description 30
- 239000004973 liquid crystal related substance Substances 0.000 claims description 71
- 239000000758 substrate Substances 0.000 description 19
- 230000003287 optical effect Effects 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
-
- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- 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
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to a display device.
- a conventionally known display device is described in Japanese Patent Application Publication No. 2010-271631.
- the display device i.e., liquid-crystal display
- the display device includes a liquid-crystal display panel that is joined, via a double-faced adhesive layer, to the frame edge of a chassis having inside a backlight unit (i.e., a backlight-contained chassis).
- the double-faced adhesive layer has a frame-shape that conforms to the shape of the chassis frame edge.
- the configuration disclosed in Japanese Patent Application Publication No. 2010-271631 unfortunately can exhibit chassis expansion or chassis contraction depending on temperature change, or can exhibit chassis deformation resulting from local application of force. Accordingly, the display panel (i.e., liquid-crystal display), joined to the chassis via the double-faced adhesive layer, can be deformed and thus can exhibit display unevenness.
- the display panel i.e., liquid-crystal display
- One possible way to prevent deformation of the display panel is reducing the area of the joint between the display panel and the double-face adhesive layer, but the display panel easily peels off from the double-face adhesive layer in this case.
- an embodiment of the present invention provides a display device that includes an illumination device and a display panel.
- the display panel faces the illumination device and displays an image using light supplied from the illumination device.
- the display device includes a chassis housing the illumination device and includes an adhesive tape bonding the display panel and the chassis together.
- the adhesive tape has a comb-shape that includes a body disposed along an edge of the chassis and includes a plurality of protrusions extending from the body.
- the display device is configured such that the plurality of protrusions each have a shape extending from the body inwardly in the plane of the display panel.
- the display device is configured such that the adhesive tape has proximal ends from which the plurality of protrusions extend.
- the display device is also configured such that the display panel includes an end disposed outside the proximal ends in the plane of the display panel, so that the display panel is bonded to the plurality of protrusions and the body.
- the display device includes a driver that drives the display panel.
- the display device is configured such that the plurality of protrusions are disposed at least at an edge of the chassis adjacent to the driver.
- the display device is configured such that the adhesive tape has the comb-shape along the entire circumference of the chassis.
- the display device is configured such that the adhesive tape includes a strip extending, in the form of a strip, from the body at the edge of the chassis adjacent to the driver.
- the display device is configured such that the display panel is a liquid-crystal panel containing a liquid crystal.
- An embodiment of the present invention can provide a display device whose display panel is less likely to be deformed and is less likely to peel off.
- FIG. 1 is a front view of a display device according to a first embodiment
- FIG. 2 is a cross-sectional view of the display device, taken along line II-II in FIG. 1 ;
- FIG. 3 is a front view of an adhesive tape
- FIG. 4 is an enlarged front view of the adhesive tape and of a back polarizer plate
- FIG. 5 is a front view of an adhesive tape of a display device according to a second embodiment.
- FIG. 6 is a front view of an adhesive tape of a display device according to a third embodiment.
- FIGS. 1 to 4 A first embodiment of the present invention will be described with reference to FIGS. 1 to 4 .
- This embodiment describes a liquid-crystal display (i.e., display device) 10 installed in a TV set.
- a liquid-crystal display i.e., display device
- each drawing shows an X-axis, Y-axis, and Z-axis, and each axis is oriented in the same direction throughout the drawings.
- the longer-side direction of the liquid-crystal display 10 corresponds to the X-direction
- the shorter-side direction of the same corresponds to the Y-direction.
- a direction orthogonal to the X-Y plane corresponds to the Z-direction.
- the liquid-crystal display 10 lies with its front side located in the upper part of the drawing sheet and with its back side located in the lower part of the same.
- the liquid-crystal display 10 has a stack of multiple components to form a rectangle.
- the liquid-crystal display 10 includes an illumination device 20 , and a liquid-crystal panel (i.e., display panel) 50 adjacent to the front side of the illumination device 20 and facing the illumination device 20 .
- the liquid-crystal panel 50 displays an image using light supplied from the illumination device 20 .
- the illumination device 20 and the liquid-crystal panel 50 are integrally secured by a bezel not shown and chassis 80 and 90 described later on.
- the illumination device 20 has the following components: a light source 21 that is disposed on one of the longer sides; a light-guiding member 22 that is a rectangular plate disposed on the side of the light source 21 ; an optical sheet 23 that is a sheet disposed on the front side of the light-guiding member 22 ; and a reflective sheet 24 that is a sheet disposed on the back side of the light-guiding member 22 and placed in the chassis 80 .
- the illumination device 20 although herein being an edge-lit illumination device, in which light from the light source 21 enters the illumination device from the side of the light-guiding member 22 , may be a direct-lit illumination device, in which the liquid-crystal panel is supplied with light from its back surface (or back side).
- the illumination device 20 can be also referred to as a backlight.
- the light source 21 has multiple LEDs 21 A that emit white light, and an LED substrate 21 B on which the LEDs 21 A are arranged at regular intervals.
- the light-guiding member 22 is made of a transparent synthetic resin material, including acrylic resin (e.g., PMMA) and polycarbonate.
- the light-guiding member 22 has a refractive index sufficiently higher than that of air.
- the light from the light source 21 enters the light-guiding member 22 , propagates through the light-guiding member 22 , and goes out to the optical sheet 23 (i.e., the front side).
- the light propagating through the light-guiding member 22 if leaking to the back side, is reflected to the optical sheet 23 by the reflective sheet 24 .
- the optical sheet 23 adds an optical action to the light emitted from the light source 21 and light-guiding member 22 , and then outputs the light toward the liquid-crystal panel 50 (or toward the front side).
- the optical sheet 23 is a three-ply sheet in which a first prism sheet 27 , a second prism sheet 28 , and a diffusion sheet 29 are laminated from the back side in this order.
- the liquid-crystal panel 50 has a pair of substrates 51 and 52 joined together with a predetermined gap therebetween.
- the liquid-crystal panel 50 also has polarizer plates 55 and 56 that are disposed on the outer surfaces of the substrates 51 and 52 and polarize the light supplied from the illumination device 20 .
- the liquid-crystal panel 50 also has a liquid-crystal layer (not shown) containing liquid-crystal molecules, which are substances, held between the substrates 51 and 52 and whose optical property changes upon field application.
- the liquid-crystal panel 50 also has a seal portion (not shown) surrounding and sealing the liquid-crystal layer.
- the liquid-crystal panel 50 operates in transverse-field mode, such as an in-plane-switching (IPS) mode or a fringe-field-switching (FFS) mode.
- IPS in-plane-switching
- FFS fringe-field-switching
- the substrates 51 and 52 are a pair of glass substrates that includes a CF substrate 51 and an array substrate (i.e., TFT substrate) 52 disposed on the back side of the CF substrate 51 .
- the CF substrate 51 includes a color filter (not shown) in which there colors: R, G, and B are arranged alternately.
- the array substrate 52 includes switching elements, pixel electrodes, and other components arranged in matrix (or in lows and columns).
- the polarizer plates 55 and 56 includes a front polarizer plate 55 disposed on the front side of the CF substrate 51 and includes a back polarizer plate 56 disposed on the back side of the array substrate 52 .
- the array substrate 52 includes a non-overlap portion 52 A that laterally extends off the CF substrate 51 at the end of one of the shorter sides (i.e., the right side in FIG. 1 ) and at the end of one of the longer sides (i.e., the lower side in FIG. 1 ).
- the non-overlap portion 52 A does not overlap the CF substrate 51 and the polarizer plates 55 and 56 , and is a non-display region of the liquid-crystal panel 50 where an image is not displayed.
- Disposed in the non-overlap portion 52 A are drivers 11 and 12 that supply various signals relating to display functions, and a flexible board 13 .
- the drivers 11 and 12 are each composed of an LSI chip having a drive circuit inside, and they are placed in the non-overlap portion 52 A through chip-on-glass (COG).
- the drivers 11 and 12 include two source drivers 11 that output a signal for display, and one gate driver 12 that outputs a gate voltage.
- the source drivers 11 are aligned in the X-direction on one of the longer sides.
- the gate driver 12 is disposed in the Y-direction on one of the shorter sides.
- the flexible board 13 is composed of a pattern of multiple wires on an insulating and flexible base material.
- the flexible board 13 is connected to the non-overlap portion 52 A and a control substrate (not shown), thus transmitting various signals from the control substrate to a display region of the liquid-crystal panel 50 , which is in the middle of the liquid-crystal panel 50 .
- the chassis 80 and 90 houses the illumination device 20 .
- the chassis 80 and 90 includes a back chassis 80 that is a casing.
- the chassis 80 and 90 also includes a front chassis 90 that is a frame (c.f., FIG. 3 ) with its front side attached inside the back chassis 80 .
- the front chassis 90 is also referred to as a backlight frame and can be made of synthetic resin or metal.
- the front chassis 90 includes an upright wall 91 standing in the Z-direction.
- the front chassis 90 also includes an inner wall 92 facing the optical sheet 23 and extending toward the display region of the liquid-crystal panel 50 ; that is, the inner wall 92 extends in the Y-axis direction (or extends inwardly in the plane of the liquid-crystal panel 50 ; hereinafter just referred to as the plane inside).
- the inner wall 92 constitutes the edge of the chassis 80 and 90 .
- the inner wall 92 has a front surface (i.e., a surface on the front side) on which an adhesive tape 30 is attached.
- the adhesive tape 30 is a piece of tape with its both surfaces applied with a sticky agent.
- the adhesive tape 30 is attached on the back surface of the back polarizer plate 56 (i.e., a surface on the back side).
- the adhesive tape 30 is attached on the back polarizer plate 56 and the inner wall 92 , thus integrally securing the liquid-crystal panel 50 and the front chassis together.
- the adhesive tape 30 includes a gate-driver adhesive tape 30 C disposed on one of the shorter sides and adjacent to the gate driver 12 (i.e., the right side in FIG. 1 ).
- the adhesive tape 30 also includes a source-driver adhesive tape 30 D disposed on one of the longer sides and adjacent to the source drivers 11 (i.e., the lower side in FIG. 1 ).
- the adhesive tape 30 further includes an upper adhesive tape 30 A opposite to the source-driver adhesive tape 30 D (i.e., the upper side in FIG. 1 ), and includes a left adhesive tape 30 B opposite to the gate-driver adhesive tape 30 C (i.e., the left side in FIG. 1 ).
- the adhesive tape 30 is a piece of tape in which these four adhesive tapes 30 A, 30 B, 30 C, and 30 D are arranged along the inner wall 92 of the front chassis 90 to form a frame.
- the gate-driver adhesive tape 30 C (hereinafter just referred to as an adhesive tape 30 C) overlaps ends disposed outside the plane of the liquid-crystal panel 50 (hereinafter just referred to as the plane outside) and overlaps the gate driver 12 .
- the source-driver adhesive tape 30 D (hereinafter just referred to as an adhesive tape 30 D) overlaps ends disposed on the plane outside of the liquid-crystal panel 50 and overlaps the source drivers 11 .
- the adhesive tapes 30 C and 30 D each include a body 31 extending along the edge of the chassis 80 and 90 (i.e., the inner wall 92 ) and each include multiple protrusions 32 extending from the body 31 to the plane inside.
- the adhesive tapes 30 C and 30 D, each of which includes the protrusions 32 extending from the body 31 to the plane inside, are also referred to as pieces of comb-shaped tape.
- the protrusions 32 are arranged in parallel across the body 31 at predetermined intervals. For instance, the adhesive tape 30 D in FIG.
- the adhesive tape 30 D has proximal ends 33 from which the respective protrusions 32 extend.
- Each proximal end 33 is between the body 31 and protrusion 32 and is closer to the outside of the plane (i.e., plane outside) of the liquid-crystal panel 50 (or back polarizer plate 56 ) than the protrusion 32 is.
- the back polarizer plate 56 of the liquid-crystal panel 50 has an end 56 D on the plane outside of the liquid-crystal panel 50 .
- the end 56 D overlaps the body 31 in a location closer to the plane outside than the proximal ends 33 are, so that the back polarizer plate 56 is joined to the protrusions 32 and body 31 .
- each protrusion 32 is, in its entirety, in contact with the surface of the back polarizer plate 56 and is sandwiched between the inner wall 92 and the back polarizer plate 56 in the Z-axis direction, as shown in FIG. 2 .
- the liquid-crystal display (i.e., display device) 10 in this embodiment includes the illumination device 20 and the liquid-crystal panel (i.e., display panel) 50 .
- the liquid-crystal panel 50 faces the illumination device 20 and displays an image using light supplied from the illumination device 20 .
- the liquid-crystal display 10 includes the chassis 90 housing the illumination device 20 and includes the adhesive tape 30 D joining the liquid-crystal panel 50 and the chassis 90 together.
- the adhesive tape 30 D has a comb-shape that includes the body 31 disposed along an edge of the chassis 90 and includes multiple protrusions 32 extending from the body 31 .
- the adhesive tape 30 D which has a comb-shape that includes the body 31 and the protrusions 32 extending from the body 31 , has spaces S (c.f., FIG. 4 ) between the protrusions 32 .
- the region in the liquid-crystal panel 50 (or back polarizer plate 56 ) overlapping the adhesive tape 30 D thus has a portion that is joined to the adhesive tape 30 D (i.e., a portion joined to the body 31 and protrusion 32 ), and has a portion that is not joined to the adhesive tape 30 D (i.e., a portion overlapping the spaces S between the protrusions 32 ).
- the protrusions 32 extend from the body 31 , disposed along the edge of the chassis 90 , to the plane inside of the display panel 50 (or back polarizer plate 56 ), which is adjacent to the display region.
- the liquid-crystal display 10 with such a configuration can prevent, in the spaces S between the protrusions 32 , from accumulation of foreign substances coming from the plane outside.
- the adhesive tape 30 D has the proximal ends 33 from which the respective protrusions 32 extend.
- the end on the plane outside of the liquid-crystal panel 50 i.e., the end 56 D of the back polarizer plate 56
- the end on the plane outside of the liquid-crystal panel 50 is closer to the plane outside than the proximal ends 33 are, so that the liquid-crystal panel 50 is joined to the protrusions 32 and body 31 .
- Such a configuration of the liquid-crystal display 10 can suitably join the liquid-crystal panel 50 to the protrusions 32 and body 31 while covering the spaces S between the protrusions 32 with the liquid-crystal panel 50 . This can prevent entrance of foreign substances from the spaces S between the protrusions 32 , and accumulation of these substances inside the chassis 90 (e.g., a location adjacent to the illumination device 20 ).
- the liquid-crystal display 10 includes the drivers 11 and 12 that drive the liquid-crystal panel 50 .
- the protrusions 32 are disposed at least at the edge of the chassis 90 adjacent to the drivers 11 and 12 .
- Such a liquid-crystal display 10 can prevent deformation in the liquid-crystal panel 50 near the drivers 11 and 12 that tends to have relatively high temperature.
- Such a liquid-crystal display 10 can also reduce the width of the adhesive tapes 30 A and 30 B, disposed at the edge of the chassis 90 other than the edge adjacent to the drivers 11 and 12 , and thus can achieve a narrow frame.
- a second embodiment of the present invention will be described with reference to FIG. 5 .
- This embodiment describes, by way of example only, a liquid-crystal display (i.e., display device) that includes an adhesive tape whose configuration is different from that of the adhesive tape in the foregoing embodiment.
- a liquid-crystal display i.e., display device
- Like components between the foregoing embodiment and the second embodiment will be denoted by the same signs, and the structures, actions and effects of the like components will not be elaborated upon here.
- An adhesive tape 230 (consisting of four adhesive tapes 230 A, 230 B, 230 C, and 230 D) includes a body 231 disposed along the edge of the chassis 90 (i.e., inner wall 92 ) and includes multiple protrusions 232 extending from the body 231 to the plane inside.
- the adhesive tape 230 has a comb-shape extending all over the perimeter of the chassis 90 (or all over the front surface of the inner wall 92 ).
- the liquid-crystal panel i.e., display panel
- the liquid-crystal panel can be joined with the comb-shaped adhesive tape 230 , attached all over the perimeter of the chassis 90 . This enables the liquid-crystal panel to be less likely to be deformed, while enhancing the adhesion between the liquid-crystal panel and the chassis 90 .
- a third embodiment of the present invention will be described with reference to FIG. 6 .
- This embodiment describes, by way of example only, a liquid-crystal display (i.e., display device) that includes an adhesive tape whose configuration is different from those of the adhesive tapes in the foregoing embodiments.
- a liquid-crystal display i.e., display device
- Like components between the foregoing embodiments and the third embodiment will be denoted by the same signs, and the structures, actions and effects of the like components will not be elaborated upon here.
- a source-driver adhesive tape 330 D is adjacent to the source drivers 11 (denoted by dot-dash lines).
- the source-driver adhesive tape 330 D includes a body 331 disposed along the edge of the chassis 80 and 90 (i.e., inner wall 92 ), includes multiple protrusions 332 extending from the body 331 to the plane inside, and includes multiple strips 334 extending from the body to the plane inside in the form of strips.
- the source-driver adhesive tape 330 D which includes the protrusions 332 extending from the body 331 to the plane inside, is also referred to as a piece of comb-shaped tape.
- the strips 334 are wider than the protrusions 332 in the X-direction.
- the protrusions 332 overlap the source drivers 11 .
- the strips 334 do not overlap the source drivers 11 .
- the liquid-crystal panel i.e., display panel
- the liquid-crystal panel can have enhanced adhesion in a portion where the liquid-crystal panel is joined to the body 331 , protrusions 332 , and strips 334 .
- the protrusions 332 and strips 334 are only in the adhesive tape 330 D, which is adjacent to the source drivers 11 . This can suitably avoid deformation in the liquid-crystal panel near the source drivers 11 that tends to have relatively high temperature.
- Such a liquid-crystal display 10 can also reduce the width of the adhesive tapes 330 A, 330 B, and 330 C, disposed at the edge of the chassis 80 and 90 other than the edge adjacent to the drivers 11 , and thus can achieve a narrow frame.
- the direction where the protrusions extend can be modified, as appropriate, other than that described in the foregoing embodiments.
- the protrusions although extending from the body to the plane inside in the foregoing embodiments, may extend in any direction.
- the protrusions may extend from the body to the plane outside, or may extend from the body to both the plane inside and the plane outside.
- the adhesive tape having protrusions can be modified, as appropriate, other than those described in the foregoing embodiments.
- the protrusions may be disposed only in the source-driver adhesive tape and arranged in parallel across the body.
- the protrusions may be disposed only in the gate-driver adhesive tape.
- the adhesive tape although consisting of four parts, may consist of any number of parts.
- the adhesive tape may be a single component continuously extending along the chassis edge to form a frame.
- the configuration of the drivers can be modified, as appropriate, other than that described in the foregoing embodiments.
- a single driver may be mounted in the middle of the non-overlap portion in the X-direction through COG.
- the driver may not overlap the adhesive tape.
- the driver may be mounted on the flexible board through chip-on-film (COF).
- the shape of the display device can be modified, as appropriate, other than that described in the foregoing embodiments.
- the display device although having a rectangular shape in the embodiments, may have any shape.
- the display device may be circular or semicircular.
- the adhesive tape in this case has a body that is bent along the chassis edge.
- the display device described in the embodiments is installed in, but not limited to, a TV set.
- the foregoing display device is usable for a vehicle inner panel, a mobile information terminal, and other things.
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
Description
- The present application claims priority from U.S. Provisional Application No. 62/871,636, filed Jul. 8, 2019, the entire contents of which are hereby incorporated by reference into this application.
- The present invention relates to a display device.
- A conventionally known display device is described in Japanese Patent Application Publication No. 2010-271631. The display device (i.e., liquid-crystal display) disclosed in Japanese Patent Application Publication No. 2010-271631 includes a liquid-crystal display panel that is joined, via a double-faced adhesive layer, to the frame edge of a chassis having inside a backlight unit (i.e., a backlight-contained chassis). The double-faced adhesive layer has a frame-shape that conforms to the shape of the chassis frame edge.
- The configuration disclosed in Japanese Patent Application Publication No. 2010-271631 unfortunately can exhibit chassis expansion or chassis contraction depending on temperature change, or can exhibit chassis deformation resulting from local application of force. Accordingly, the display panel (i.e., liquid-crystal display), joined to the chassis via the double-faced adhesive layer, can be deformed and thus can exhibit display unevenness. One possible way to prevent deformation of the display panel is reducing the area of the joint between the display panel and the double-face adhesive layer, but the display panel easily peels off from the double-face adhesive layer in this case.
- To solve the above problem, it is an object of an embodiment of the present invention to provide a display device whose display panel is less likely to be deformed and is less likely to peel off.
- (1) To solve the above problem, an embodiment of the present invention provides a display device that includes an illumination device and a display panel. The display panel faces the illumination device and displays an image using light supplied from the illumination device. The display device includes a chassis housing the illumination device and includes an adhesive tape bonding the display panel and the chassis together. The adhesive tape has a comb-shape that includes a body disposed along an edge of the chassis and includes a plurality of protrusions extending from the body.
- (2) In addition to Configuration 1, the display device according to an embodiment of the present invention is configured such that the plurality of protrusions each have a shape extending from the body inwardly in the plane of the display panel.
- (3) In addition to Configuration 2, the display device according to an embodiment of the present invention is configured such that the adhesive tape has proximal ends from which the plurality of protrusions extend. The display device is also configured such that the display panel includes an end disposed outside the proximal ends in the plane of the display panel, so that the display panel is bonded to the plurality of protrusions and the body.
- (4) In addition to any one of Configurations 1 to 3, the display device according to an embodiment of the present invention includes a driver that drives the display panel. The display device is configured such that the plurality of protrusions are disposed at least at an edge of the chassis adjacent to the driver.
- (5) In addition to any one of Configurations 1 to 4, the display device according to an embodiment of the present invention is configured such that the adhesive tape has the comb-shape along the entire circumference of the chassis.
- (6) In addition to Configuration 4, the display device according to an embodiment of the present invention is configured such that the adhesive tape includes a strip extending, in the form of a strip, from the body at the edge of the chassis adjacent to the driver.
- (7) In addition to any one of Configurations 1 to 6, the display device according to an embodiment of the present invention is configured such that the display panel is a liquid-crystal panel containing a liquid crystal.
- An embodiment of the present invention can provide a display device whose display panel is less likely to be deformed and is less likely to peel off.
-
FIG. 1 is a front view of a display device according to a first embodiment; -
FIG. 2 is a cross-sectional view of the display device, taken along line II-II inFIG. 1 ; -
FIG. 3 is a front view of an adhesive tape; -
FIG. 4 is an enlarged front view of the adhesive tape and of a back polarizer plate; -
FIG. 5 is a front view of an adhesive tape of a display device according to a second embodiment; and -
FIG. 6 is a front view of an adhesive tape of a display device according to a third embodiment. - A first embodiment of the present invention will be described with reference to
FIGS. 1 to 4 . This embodiment describes a liquid-crystal display (i.e., display device) 10 installed in a TV set. Herein, each drawing shows an X-axis, Y-axis, and Z-axis, and each axis is oriented in the same direction throughout the drawings. In each drawing, the longer-side direction of the liquid-crystal display 10 corresponds to the X-direction, and the shorter-side direction of the same corresponds to the Y-direction. In addition, a direction orthogonal to the X-Y plane corresponds to the Z-direction. With reference toFIG. 2 , the liquid-crystal display 10 lies with its front side located in the upper part of the drawing sheet and with its back side located in the lower part of the same. - As shown in
FIGS. 1 and 2 , the liquid-crystal display 10 has a stack of multiple components to form a rectangle. The liquid-crystal display 10 includes anillumination device 20, and a liquid-crystal panel (i.e., display panel) 50 adjacent to the front side of theillumination device 20 and facing theillumination device 20. The liquid-crystal panel 50 displays an image using light supplied from theillumination device 20. Theillumination device 20 and the liquid-crystal panel 50 are integrally secured by a bezel not shown andchassis - As shown in
FIG. 2 , theillumination device 20 has the following components: alight source 21 that is disposed on one of the longer sides; a light-guidingmember 22 that is a rectangular plate disposed on the side of thelight source 21; anoptical sheet 23 that is a sheet disposed on the front side of the light-guidingmember 22; and areflective sheet 24 that is a sheet disposed on the back side of the light-guidingmember 22 and placed in thechassis 80. Theillumination device 20, although herein being an edge-lit illumination device, in which light from thelight source 21 enters the illumination device from the side of the light-guidingmember 22, may be a direct-lit illumination device, in which the liquid-crystal panel is supplied with light from its back surface (or back side). Theillumination device 20 can be also referred to as a backlight. - The
light source 21 hasmultiple LEDs 21A that emit white light, and anLED substrate 21B on which theLEDs 21A are arranged at regular intervals. The light-guidingmember 22 is made of a transparent synthetic resin material, including acrylic resin (e.g., PMMA) and polycarbonate. The light-guidingmember 22 has a refractive index sufficiently higher than that of air. The light from thelight source 21 enters the light-guidingmember 22, propagates through the light-guidingmember 22, and goes out to the optical sheet 23 (i.e., the front side). The light propagating through the light-guidingmember 22, if leaking to the back side, is reflected to theoptical sheet 23 by thereflective sheet 24. - The
optical sheet 23 adds an optical action to the light emitted from thelight source 21 and light-guidingmember 22, and then outputs the light toward the liquid-crystal panel 50 (or toward the front side). Theoptical sheet 23 is a three-ply sheet in which afirst prism sheet 27, asecond prism sheet 28, and adiffusion sheet 29 are laminated from the back side in this order. - The liquid-
crystal panel 50 has a pair ofsubstrates crystal panel 50 also haspolarizer plates substrates illumination device 20. The liquid-crystal panel 50 also has a liquid-crystal layer (not shown) containing liquid-crystal molecules, which are substances, held between thesubstrates crystal panel 50 also has a seal portion (not shown) surrounding and sealing the liquid-crystal layer. The liquid-crystal panel 50 operates in transverse-field mode, such as an in-plane-switching (IPS) mode or a fringe-field-switching (FFS) mode. - The
substrates CF substrate 51 and an array substrate (i.e., TFT substrate) 52 disposed on the back side of theCF substrate 51. TheCF substrate 51 includes a color filter (not shown) in which there colors: R, G, and B are arranged alternately. Thearray substrate 52 includes switching elements, pixel electrodes, and other components arranged in matrix (or in lows and columns). Thepolarizer plates front polarizer plate 55 disposed on the front side of theCF substrate 51 and includes aback polarizer plate 56 disposed on the back side of thearray substrate 52. - As shown in
FIGS. 1 and 2 , thearray substrate 52 includes anon-overlap portion 52A that laterally extends off theCF substrate 51 at the end of one of the shorter sides (i.e., the right side inFIG. 1 ) and at the end of one of the longer sides (i.e., the lower side inFIG. 1 ). Thenon-overlap portion 52A does not overlap theCF substrate 51 and thepolarizer plates crystal panel 50 where an image is not displayed. Disposed in thenon-overlap portion 52A aredrivers flexible board 13. - The
drivers non-overlap portion 52A through chip-on-glass (COG). Thedrivers source drivers 11 that output a signal for display, and onegate driver 12 that outputs a gate voltage. Thesource drivers 11 are aligned in the X-direction on one of the longer sides. Thegate driver 12 is disposed in the Y-direction on one of the shorter sides. Theflexible board 13 is composed of a pattern of multiple wires on an insulating and flexible base material. Theflexible board 13 is connected to thenon-overlap portion 52A and a control substrate (not shown), thus transmitting various signals from the control substrate to a display region of the liquid-crystal panel 50, which is in the middle of the liquid-crystal panel 50. - As shown in
FIG. 2 , thechassis illumination device 20. Thechassis back chassis 80 that is a casing. Thechassis front chassis 90 that is a frame (c.f.,FIG. 3 ) with its front side attached inside theback chassis 80. Thefront chassis 90 is also referred to as a backlight frame and can be made of synthetic resin or metal. Thefront chassis 90 includes anupright wall 91 standing in the Z-direction. Thefront chassis 90 also includes aninner wall 92 facing theoptical sheet 23 and extending toward the display region of the liquid-crystal panel 50; that is, theinner wall 92 extends in the Y-axis direction (or extends inwardly in the plane of the liquid-crystal panel 50; hereinafter just referred to as the plane inside). Theinner wall 92 constitutes the edge of thechassis - The
inner wall 92 has a front surface (i.e., a surface on the front side) on which anadhesive tape 30 is attached. Theadhesive tape 30 is a piece of tape with its both surfaces applied with a sticky agent. Theadhesive tape 30 is attached on the back surface of the back polarizer plate 56 (i.e., a surface on the back side). Theadhesive tape 30 is attached on theback polarizer plate 56 and theinner wall 92, thus integrally securing the liquid-crystal panel 50 and the front chassis together. - As shown in
FIG. 3 , theadhesive tape 30 includes a gate-driver adhesive tape 30C disposed on one of the shorter sides and adjacent to the gate driver 12 (i.e., the right side inFIG. 1 ). Theadhesive tape 30 also includes a source-driveradhesive tape 30D disposed on one of the longer sides and adjacent to the source drivers 11 (i.e., the lower side inFIG. 1 ). Theadhesive tape 30 further includes an upperadhesive tape 30A opposite to the source-driveradhesive tape 30D (i.e., the upper side inFIG. 1 ), and includes a leftadhesive tape 30B opposite to the gate-driver adhesive tape 30C (i.e., the left side inFIG. 1 ). Theadhesive tape 30 is a piece of tape in which these fouradhesive tapes inner wall 92 of thefront chassis 90 to form a frame. - As shown in
FIGS. 1 to 3 , the gate-driver adhesive tape 30C (hereinafter just referred to as an adhesive tape 30C) overlaps ends disposed outside the plane of the liquid-crystal panel 50 (hereinafter just referred to as the plane outside) and overlaps thegate driver 12. Moreover, the source-driveradhesive tape 30D (hereinafter just referred to as anadhesive tape 30D) overlaps ends disposed on the plane outside of the liquid-crystal panel 50 and overlaps thesource drivers 11. - As shown in
FIGS. 2 to 4 , theadhesive tapes 30C and 30D each include abody 31 extending along the edge of thechassis 80 and 90 (i.e., the inner wall 92) and each includemultiple protrusions 32 extending from thebody 31 to the plane inside. Theadhesive tapes 30C and 30D, each of which includes theprotrusions 32 extending from thebody 31 to the plane inside, are also referred to as pieces of comb-shaped tape. Theprotrusions 32 are arranged in parallel across thebody 31 at predetermined intervals. For instance, theadhesive tape 30D inFIG. 3 is configured such that itsbody 31, extending along where theinner wall 92 extends in the X-direction, hasmultiple protrusions 32 arranged in parallel from one of the body ends adjacent to theadhesive tape 30B to the other body end adjacent to the adhesive tape 30C at predetermined intervals. - As shown in
FIG. 4 , theadhesive tape 30D has proximal ends 33 from which therespective protrusions 32 extend. Eachproximal end 33 is between thebody 31 andprotrusion 32 and is closer to the outside of the plane (i.e., plane outside) of the liquid-crystal panel 50 (or back polarizer plate 56) than theprotrusion 32 is. Theback polarizer plate 56 of the liquid-crystal panel 50 has an end 56D on the plane outside of the liquid-crystal panel 50. The end 56D overlaps thebody 31 in a location closer to the plane outside than the proximal ends 33 are, so that theback polarizer plate 56 is joined to theprotrusions 32 andbody 31. The end 56D of theback polarizer plate 56 is on thebody 31 of theadhesive tape 30 and is not on theprotrusions 32. Thus, eachprotrusion 32 is, in its entirety, in contact with the surface of theback polarizer plate 56 and is sandwiched between theinner wall 92 and theback polarizer plate 56 in the Z-axis direction, as shown inFIG. 2 . - The following described effects of this embodiment. The liquid-crystal display (i.e., display device) 10 in this embodiment includes the
illumination device 20 and the liquid-crystal panel (i.e., display panel) 50. The liquid-crystal panel 50 faces theillumination device 20 and displays an image using light supplied from theillumination device 20. The liquid-crystal display 10 includes thechassis 90 housing theillumination device 20 and includes theadhesive tape 30D joining the liquid-crystal panel 50 and thechassis 90 together. Theadhesive tape 30D has a comb-shape that includes thebody 31 disposed along an edge of thechassis 90 and includesmultiple protrusions 32 extending from thebody 31. - In such a liquid-
crystal display 10, theadhesive tape 30D, which has a comb-shape that includes thebody 31 and theprotrusions 32 extending from thebody 31, has spaces S (c.f.,FIG. 4 ) between theprotrusions 32. The region in the liquid-crystal panel 50 (or back polarizer plate 56) overlapping theadhesive tape 30D thus has a portion that is joined to theadhesive tape 30D (i.e., a portion joined to thebody 31 and protrusion 32), and has a portion that is not joined to theadhesive tape 30D (i.e., a portion overlapping the spaces S between the protrusions 32). For a deformation in thechassis 90 due to a temperature change, external pressure, or other factors, such a configuration enables the liquid-crystal panel 50 to maintain adhesion in the portion joined to thebody 31 andprotrusion 32, and also fails to propagate the deformation in thechassis 90 to the portion overlapping the spaces S between theprotrusions 32. As a result, the liquid-crystal panel 50 is less likely to be deformed as a whole. - In this embodiment, the
protrusions 32 extend from thebody 31, disposed along the edge of thechassis 90, to the plane inside of the display panel 50 (or back polarizer plate 56), which is adjacent to the display region. The liquid-crystal display 10 with such a configuration can prevent, in the spaces S between theprotrusions 32, from accumulation of foreign substances coming from the plane outside. - In this embodiment, the
adhesive tape 30D has the proximal ends 33 from which therespective protrusions 32 extend. In addition, the end on the plane outside of the liquid-crystal panel 50 (i.e., the end 56D of the back polarizer plate 56) is closer to the plane outside than the proximal ends 33 are, so that the liquid-crystal panel 50 is joined to theprotrusions 32 andbody 31. - Such a configuration of the liquid-
crystal display 10 can suitably join the liquid-crystal panel 50 to theprotrusions 32 andbody 31 while covering the spaces S between theprotrusions 32 with the liquid-crystal panel 50. This can prevent entrance of foreign substances from the spaces S between theprotrusions 32, and accumulation of these substances inside the chassis 90 (e.g., a location adjacent to the illumination device 20). - In this embodiment, the liquid-
crystal display 10 includes thedrivers crystal panel 50. In addition, theprotrusions 32 are disposed at least at the edge of thechassis 90 adjacent to thedrivers - Such a liquid-
crystal display 10 can prevent deformation in the liquid-crystal panel 50 near thedrivers crystal display 10 can also reduce the width of theadhesive tapes chassis 90 other than the edge adjacent to thedrivers - In this embodiment, the liquid-
crystal panel 50 is a liquid-crystal panel containing liquid crystals. For a deformation in thechassis 90 due to a temperature change or other factors, such a liquid-crystal display 10 can have the liquid-crystal panel 50 that is less likely to be deformed and is less likely to peel off. - A second embodiment of the present invention will be described with reference to
FIG. 5 . This embodiment describes, by way of example only, a liquid-crystal display (i.e., display device) that includes an adhesive tape whose configuration is different from that of the adhesive tape in the foregoing embodiment. Like components between the foregoing embodiment and the second embodiment will be denoted by the same signs, and the structures, actions and effects of the like components will not be elaborated upon here. - An adhesive tape 230 (consisting of four
adhesive tapes body 231 disposed along the edge of the chassis 90 (i.e., inner wall 92) and includesmultiple protrusions 232 extending from thebody 231 to the plane inside. Theadhesive tape 230 has a comb-shape extending all over the perimeter of the chassis 90 (or all over the front surface of the inner wall 92). - In such a liquid-crystal display, the liquid-crystal panel (i.e., display panel) can be joined with the comb-shaped
adhesive tape 230, attached all over the perimeter of thechassis 90. This enables the liquid-crystal panel to be less likely to be deformed, while enhancing the adhesion between the liquid-crystal panel and thechassis 90. - A third embodiment of the present invention will be described with reference to
FIG. 6 . This embodiment describes, by way of example only, a liquid-crystal display (i.e., display device) that includes an adhesive tape whose configuration is different from those of the adhesive tapes in the foregoing embodiments. Like components between the foregoing embodiments and the third embodiment will be denoted by the same signs, and the structures, actions and effects of the like components will not be elaborated upon here. - A source-driver
adhesive tape 330D, one of fouradhesive tapes adhesive tape 330D includes abody 331 disposed along the edge of thechassis 80 and 90 (i.e., inner wall 92), includesmultiple protrusions 332 extending from thebody 331 to the plane inside, and includesmultiple strips 334 extending from the body to the plane inside in the form of strips. The source-driveradhesive tape 330D, which includes theprotrusions 332 extending from thebody 331 to the plane inside, is also referred to as a piece of comb-shaped tape. Thestrips 334 are wider than theprotrusions 332 in the X-direction. Theprotrusions 332 overlap thesource drivers 11. Thestrips 334 do not overlap thesource drivers 11. - In such a liquid-crystal display, the liquid-crystal panel (i.e., display panel) can have enhanced adhesion in a portion where the liquid-crystal panel is joined to the
body 331,protrusions 332, and strips 334. Further, theprotrusions 332 and strips 334 are only in theadhesive tape 330D, which is adjacent to thesource drivers 11. This can suitably avoid deformation in the liquid-crystal panel near thesource drivers 11 that tends to have relatively high temperature. Such a liquid-crystal display 10 can also reduce the width of theadhesive tapes chassis drivers 11, and thus can achieve a narrow frame. - The present invention is not limited to the foregoing embodiments described with reference to the drawings. The following embodiments for instance are also included in the technical scope of the present invention, and can be modified in various ways without departing from the technical scope.
- (1) The direction where the protrusions extend can be modified, as appropriate, other than that described in the foregoing embodiments. The protrusions, although extending from the body to the plane inside in the foregoing embodiments, may extend in any direction. For instance, the protrusions may extend from the body to the plane outside, or may extend from the body to both the plane inside and the plane outside.
- (2) The adhesive tape having protrusions can be modified, as appropriate, other than those described in the foregoing embodiments. For instance, the protrusions may be disposed only in the source-driver adhesive tape and arranged in parallel across the body. Alternatively, the protrusions may be disposed only in the gate-driver adhesive tape.
- (3) The adhesive tape, although consisting of four parts, may consist of any number of parts. For instance, the adhesive tape may be a single component continuously extending along the chassis edge to form a frame.
- (4) The configuration of the drivers can be modified, as appropriate, other than that described in the foregoing embodiments. For instance, a single driver may be mounted in the middle of the non-overlap portion in the X-direction through COG. Moreover, the driver may not overlap the adhesive tape. Furthermore, the driver may be mounted on the flexible board through chip-on-film (COF).
- (5) The shape of the display device can be modified, as appropriate, other than that described in the foregoing embodiments. The display device, although having a rectangular shape in the embodiments, may have any shape. For instance, the display device may be circular or semicircular. The adhesive tape in this case has a body that is bent along the chassis edge.
- (6) The display device described in the embodiments is installed in, but not limited to, a TV set. For instance, the foregoing display device is usable for a vehicle inner panel, a mobile information terminal, and other things.
- The present invention is not limited to the description of the embodiments above and may be altered within the scope of the claims. Embodiments based on a proper combination of technical means disclosed in different embodiments are encompassed in the technical scope of the present invention. Furthermore, a new technological feature can be created by combining different technological means disclosed in the embodiments.
Claims (7)
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US20220252917A1 (en) * | 2021-02-10 | 2022-08-11 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display device and manufacturing method thereof |
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AU2003221004A1 (en) * | 2002-03-29 | 2003-10-13 | Matsushita Electric Industrial Co., Ltd. | Illumination unit and liquid crystal display apparatus comprising same |
JP4746981B2 (en) * | 2005-12-26 | 2011-08-10 | Nec液晶テクノロジー株式会社 | Liquid crystal display device, dustproof method and assembly method thereof |
JP4353266B2 (en) * | 2007-04-05 | 2009-10-28 | エプソンイメージングデバイス株式会社 | Electro-optical device and electronic apparatus |
US8797473B2 (en) * | 2007-09-12 | 2014-08-05 | Japan Display West Inc. | Electro-optical device having a frame including a conduction part and a resin part |
JP2010271631A (en) | 2009-05-25 | 2010-12-02 | Sharp Corp | Method for manufacturing display device, double-sided adhesive set, and display device |
KR101690022B1 (en) * | 2010-01-29 | 2016-12-28 | 삼성디스플레이 주식회사 | Back-light assembly and display device having the same |
US20140092339A1 (en) * | 2011-05-12 | 2014-04-03 | Sharp Kabushiki Kaisha | Illumination device and liquid crystal display device |
CN105782820B (en) * | 2016-04-27 | 2018-07-27 | 合肥京东方显示光源有限公司 | The assemble method of backboard, back light unit, display device and back light unit |
EP3693788A4 (en) * | 2017-10-06 | 2021-06-23 | AGC Inc. | Display device and method for manufacturing display device |
JP2020012969A (en) * | 2018-07-18 | 2020-01-23 | 三菱電機株式会社 | Display device and display equipment |
US10725234B2 (en) * | 2018-10-04 | 2020-07-28 | Sharp Kabushiki Kaisha | Display device |
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US20220252917A1 (en) * | 2021-02-10 | 2022-08-11 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display device and manufacturing method thereof |
US11982908B2 (en) * | 2021-02-10 | 2024-05-14 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Display device and manufacturing method thereof |
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