WO2009118960A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
- Publication number
- WO2009118960A1 WO2009118960A1 PCT/JP2008/072294 JP2008072294W WO2009118960A1 WO 2009118960 A1 WO2009118960 A1 WO 2009118960A1 JP 2008072294 W JP2008072294 W JP 2008072294W WO 2009118960 A1 WO2009118960 A1 WO 2009118960A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- liquid crystal
- guide plate
- chassis
- light guide
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
Definitions
- the present invention relates to a liquid crystal display device.
- liquid crystal display devices widely used in various electronic devices such as information communication devices such as personal computers and mobile phones do not emit light themselves, they are usually used in combination with a backlight.
- a backlight that has a configuration in which light is input from one end surface of the light guide plate and light is output from the output surface, which is the widest surface of the light guide plate, is often used.
- Most of the light sources are LEDs. Examples of liquid crystal display devices having such a backlight can be seen in Patent Documents 1 and 2.
- Patent Document 1 describes a liquid crystal display device including a flat light emitting device in which a light guide plate that guides light from a white LED and a reflection plate are housed in a casing.
- Patent Document 2 describes a liquid crystal display device in which a light guide plate that allows light from an LED to enter from a side surface is sandwiched between a first display panel and a second display panel, and a single light guide plate simultaneously illuminates two display panels. Has been. JP 2007-178463 A JP2007-148048
- a liquid crystal display device including a backlight often has a structure in which components are assembled to a frame-like chassis (“casing” in Patent Document 1 and “frame” in Patent Document 2).
- FIGS. 1 and 2 An example of a conventional structure of such a liquid crystal display device is shown in FIGS.
- the liquid crystal display device 1 includes the following as constituent elements. That is, the liquid crystal panel 10, the chassis 11, the reflection plate 12, the light guide plate 13, the diffusion sheet 14, the first lens sheet 15, the second lens sheet 16, the first light shielding double-sided tape 17, the second light shielding double-sided tape 18, And two light source LEDs 19 (see FIG. 4) mounted on the chassis 11.
- the upper side in FIG. 3 is the upper side
- the lower side is the lower side.
- the chassis 11 is formed by molding a planar rectangular frame shape with synthetic resin, and includes an opening 20 on the inside and a rising wall 21 on the periphery.
- the light guide plate 13 is held in the opening 20, and the liquid crystal panel 10 having a slightly larger planar shape than the light guide plate 13 is held in the rising wall 21.
- the light guide plate 13 takes in the light emitted from the light source LED 19 from the light incident portion formed on one side, emits the light from the emission surface which is the widest surface, and illuminates the liquid crystal panel 10 from the back side.
- the exit surface is subjected to a process for changing the direction of light. This process is normally performed on the light guide plate for backlight of the liquid crystal panel, and detailed description thereof is omitted.
- the light guide plate 13 has a rectangular planar shape, and a light incident portion 22 is formed on one short side of the four sides of the periphery.
- the light incident portion 22 is a convex portion having a trapezoidal planar shape, and two light incident portions 22 are provided according to the number of the light source LEDs 19.
- the top of the trapezoid is a short straight part parallel to the other short side of the light guide plate 13, and this part faces the light emitting part of the light source LED 19.
- Claws are formed at several positions on the periphery of the light guide plate 13.
- the arrangement is as shown in FIG. 4, and two claws are formed on the left and right long sides.
- one claw 23a is formed just before the short side where the light incident part 21 exists
- the other claw 23b is formed just before the short side where the light incident part 22 does not exist.
- the claws 23 a and 23 b engage with recesses 24 a and 24 b formed at the edge of the opening 20 of the chassis 11.
- the light guide plate 13 is accurately positioned with respect to the chassis 11, and is held by the chassis 11 without penetrating downward through the opening 20.
- the sizes of the diffusion sheet 14, the first lens sheet 15, and the second lens sheet 16 are substantially the same as those of the light guide plate 13. After the light guide plate 13 is held in the opening 20 of the chassis 11, the light guide plate 13 is placed on top of each other.
- the height of the upper surface of the second lens sheet 16 that comes to the top is substantially the same as the height of the upper surface of the chassis 11 excluding the rising wall 21.
- the liquid crystal panel 10 is attached to the chassis 11 with a frame-shaped first light-shielding double-sided tape 17.
- the components from the light guide plate 13 to the second lens sheet 16 cannot be pulled upward from the chassis 11 and are fixed to the chassis 11.
- the rising wall 21 plays a role of positioning the liquid crystal panel 10 placed on the chassis 11.
- the reflector 12 is fixed to the lower surface of the chassis 11 with a second light-shielding double-sided tape 18.
- the attaching process of the reflecting plate 12 may be before or after the attaching process of the components arranged on the upper surface side of the chassis 11.
- a region A surrounded by a two-dot chain line is a display region of the liquid crystal panel 10.
- the two light source LEDs 19 are turned on, the light entering from the light incident portion 22 is diffused throughout the light guide plate 13.
- the liquid crystal panel 10 is backed through the diffusion sheet 14, the first lens sheet 15, and the second lens sheet 16. Illuminate from the side.
- the liquid crystal display device 1 having the above configuration has the following problems. That is, a part of the light entering from the light incident part 22 directly shines on the claw 23 a arranged at a location close to the light incident part 22. The light incident on the nail 23a is reflected at the corner of the nail 23a as shown in FIG. 5 or 6, and strong reflected light leaks into the display area A. For this reason, the edge of the display area A is only partially brightened, the uniformity of the brightness of the liquid crystal panel 10 is impaired, and the display quality of the liquid crystal panel 10 is degraded.
- the present invention has been made in view of the above problems, and an object thereof is to prevent the nails formed on the light guide plate from deteriorating the display quality of the liquid crystal panel.
- the present invention provides a liquid crystal display device in which a light guide plate for backlight having a light incident portion formed on one side is disposed on the back side of a liquid crystal panel, and the light guide plate is held by a chassis.
- a claw that engages with the chassis is formed at several peripheral edges, and the claw that is located near the light incident part in the claw is a position that avoids direct irradiation of incident light. It is characterized by being arranged.
- the incident light from the light incident part does not directly shine on the nail, and only a part of the diffused light is incident on the nail, so that strong reflected light is generated at the nail portion. Does not leak into the display area of the liquid crystal panel.
- the claw positioned near the light incident portion is disposed at a position overlapping a light-shielding double-sided tape that fixes the liquid crystal panel to the chassis. Yes.
- the incident light from the light incident portion does not directly shine on the nail formed on the light guide plate, strong reflected light generated at the nail portion does not leak into the display area of the liquid crystal panel, and the display quality is impaired. I can't.
- FIG. 1 is an exploded perspective view of components of a liquid crystal display device according to the present invention.
- the top view of the state which attached the light-guide plate to the chassis of the liquid crystal display device of FIG. Exploded perspective view of components of a conventional liquid crystal display device
- Partial enlarged view of FIG. 4 is a partially enlarged view of FIG. 4 and shows a state different from FIG.
- FIG. 1 and FIG. 2 show an embodiment of the present invention.
- the same reference numerals as those used in FIGS. 3 to 6 are attached to the same components as those in the conventional structure of FIGS. 3 to 6, and the description thereof will be omitted.
- the present invention is different from the conventional structure in the position of the claw 23a located near the light incident part 22.
- the claw 23 a is disposed at a position that avoids direct incidence of incident light that enters from the light incident portion 22.
- the position of the approximate oblique side on the side adjacent to the long side of the light guide plate 13 is selected as the placement location of the claw 23a.
- the position of the recess 24a is also changed according to the claw 23a.
- the claw 23a Since the claw 23a is in the above position, the incident light entering from the light incident part 22 does not directly shine on the claw 23a. Therefore, strong reflected light does not occur inside the claw 23a, particularly in the corner portion, and it does not leak into the display area A of the liquid crystal panel 10 and the display quality of the liquid crystal panel 10 does not deteriorate. Further, even if some light reflection occurs inside the claw 23a, it is covered with the light-shielding double-sided tape 17, and does not affect the display quality of the liquid crystal panel 10.
- the present invention can be widely used for a relatively small liquid crystal display device with a backlight.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
10 液晶パネル
11 シャーシ
12 反射板
13 導光板
14 拡散シート
15 第1のレンズシート
16 第2のレンズシート
17 第1の遮光両面テープ
18 第2の遮光両面テープ
19 光源LED
22 光入射部
23a、23b 爪
24a、24b 凹部
Claims (2)
- 一辺に光入射部が形成されているバックライト用の導光板を液晶パネルの背面側に配置する液晶表示装置において、
前記導光板はシャーシに保持されるものであって、周縁数箇所には前記シャーシに係合する爪が形成されており、前記爪の中で前記光入射部に近い箇所に位置するものは、入射光の直射を回避する位置に配置されていることを特徴とする液晶表示装置。 - 前記光入射部に近い箇所に位置する爪は、前記液晶パネルを前記シャーシに固定する遮光両面テープに重なる位置に配置されていることを特徴とする請求項1に記載の液晶表示装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08873592A EP2237102A4 (en) | 2008-03-25 | 2008-12-09 | LIQUID CRYSTAL DISPLAY DEVICE |
JP2010505275A JPWO2009118960A1 (ja) | 2008-03-25 | 2008-12-09 | 液晶表示装置 |
US12/812,446 US20100289981A1 (en) | 2008-03-25 | 2008-12-09 | Liquid crystal display device |
CN2008801240698A CN101910917B (zh) | 2008-03-25 | 2008-12-09 | 液晶显示装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-076932 | 2008-03-25 | ||
JP2008076932 | 2008-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009118960A1 true WO2009118960A1 (ja) | 2009-10-01 |
Family
ID=41113182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/072294 WO2009118960A1 (ja) | 2008-03-25 | 2008-12-09 | 液晶表示装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100289981A1 (ja) |
EP (1) | EP2237102A4 (ja) |
JP (1) | JPWO2009118960A1 (ja) |
CN (1) | CN101910917B (ja) |
WO (1) | WO2009118960A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012014601A1 (ja) * | 2010-07-29 | 2012-02-02 | シャープ株式会社 | 照明装置、表示装置及びテレビ受信装置 |
JP2018088322A (ja) * | 2016-11-28 | 2018-06-07 | 株式会社ジャパンディスプレイ | バックライト装置およびこれを備える液晶表示装置 |
JP2020109767A (ja) * | 2020-04-02 | 2020-07-16 | 株式会社ジャパンディスプレイ | バックライト装置およびこれを備える液晶表示装置 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101262634B1 (ko) | 2011-03-14 | 2013-05-08 | 엘지이노텍 주식회사 | 표시장치 |
KR20140094914A (ko) * | 2013-01-23 | 2014-07-31 | 삼성디스플레이 주식회사 | 백라이트 어셈블리를 갖는 표시 장치 |
JP6621881B1 (ja) * | 2018-08-03 | 2019-12-18 | 株式会社バンダイ | 液晶表示装置及びこれを用いた玩具 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007017783A (ja) * | 2005-07-08 | 2007-01-25 | Hitachi Displays Ltd | 液晶表示装置およびその照明装置 |
JP2007148048A (ja) | 2005-11-29 | 2007-06-14 | Epson Imaging Devices Corp | 表示装置および携帯機器 |
JP2007178463A (ja) | 2005-12-26 | 2007-07-12 | Matsushita Electric Works Ltd | 平面発光装置、及び平面発光装置を備えた液晶表示装置 |
JP2008034223A (ja) * | 2006-07-28 | 2008-02-14 | Nec Saitama Ltd | 照明装置、液晶表示装置、及び、携帯端末装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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TW542931B (en) * | 2001-01-16 | 2003-07-21 | Au Optronics Corp | Back lighting device of liquid crystal display device |
JP2003195265A (ja) * | 2001-12-27 | 2003-07-09 | Kawaguchiko Seimitsu Co Ltd | 液晶表示装置のバックライト構造 |
JP2003255309A (ja) * | 2002-03-04 | 2003-09-10 | Nec Lcd Technologies Ltd | 光学ユニット及びそれを用いた液晶表示装置 |
KR100883098B1 (ko) * | 2002-04-26 | 2009-02-11 | 삼성전자주식회사 | 백라이트 어셈블리 및 이를 이용한 액정표시장치 |
JP2004184493A (ja) * | 2002-11-29 | 2004-07-02 | Seiko Epson Corp | 電気光学装置、電気光学装置の製造方法、および電子機器 |
JP4465596B2 (ja) * | 2004-04-26 | 2010-05-19 | オムロン株式会社 | 光源モジュール及び面光源装置 |
CN101317038B (zh) * | 2005-11-28 | 2010-05-19 | 夏普株式会社 | 背光装置和使用该背光装置的液晶显示装置 |
JP4238880B2 (ja) * | 2006-04-03 | 2009-03-18 | エプソンイメージングデバイス株式会社 | 照明装置及び液晶表示装置 |
JP5142499B2 (ja) * | 2006-08-18 | 2013-02-13 | 株式会社ジャパンディスプレイイースト | 液晶表示装置 |
JP2008209818A (ja) * | 2007-02-28 | 2008-09-11 | Funai Electric Co Ltd | 液晶表示装置 |
-
2008
- 2008-12-09 JP JP2010505275A patent/JPWO2009118960A1/ja active Pending
- 2008-12-09 CN CN2008801240698A patent/CN101910917B/zh not_active Expired - Fee Related
- 2008-12-09 WO PCT/JP2008/072294 patent/WO2009118960A1/ja active Application Filing
- 2008-12-09 US US12/812,446 patent/US20100289981A1/en not_active Abandoned
- 2008-12-09 EP EP08873592A patent/EP2237102A4/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007017783A (ja) * | 2005-07-08 | 2007-01-25 | Hitachi Displays Ltd | 液晶表示装置およびその照明装置 |
JP2007148048A (ja) | 2005-11-29 | 2007-06-14 | Epson Imaging Devices Corp | 表示装置および携帯機器 |
JP2007178463A (ja) | 2005-12-26 | 2007-07-12 | Matsushita Electric Works Ltd | 平面発光装置、及び平面発光装置を備えた液晶表示装置 |
JP2008034223A (ja) * | 2006-07-28 | 2008-02-14 | Nec Saitama Ltd | 照明装置、液晶表示装置、及び、携帯端末装置 |
Non-Patent Citations (1)
Title |
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See also references of EP2237102A4 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012014601A1 (ja) * | 2010-07-29 | 2012-02-02 | シャープ株式会社 | 照明装置、表示装置及びテレビ受信装置 |
JP2018088322A (ja) * | 2016-11-28 | 2018-06-07 | 株式会社ジャパンディスプレイ | バックライト装置およびこれを備える液晶表示装置 |
JP2020109767A (ja) * | 2020-04-02 | 2020-07-16 | 株式会社ジャパンディスプレイ | バックライト装置およびこれを備える液晶表示装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2237102A1 (en) | 2010-10-06 |
JPWO2009118960A1 (ja) | 2011-07-21 |
US20100289981A1 (en) | 2010-11-18 |
CN101910917B (zh) | 2012-11-21 |
EP2237102A4 (en) | 2010-12-29 |
CN101910917A (zh) | 2010-12-08 |
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