JP2000331518A - Surface light source device, light guide plate, and display device - Google Patents

Surface light source device, light guide plate, and display device

Info

Publication number
JP2000331518A
JP2000331518A JP11140599A JP14059999A JP2000331518A JP 2000331518 A JP2000331518 A JP 2000331518A JP 11140599 A JP11140599 A JP 11140599A JP 14059999 A JP14059999 A JP 14059999A JP 2000331518 A JP2000331518 A JP 2000331518A
Authority
JP
Japan
Prior art keywords
light
guide plate
light guide
sheet
light source
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.)
Pending
Application number
JP11140599A
Other languages
Japanese (ja)
Inventor
Toshiaki Kamogawa
敏明 鴨川
Hirokazu Matsuo
宏和 松尾
Takaya Kusafuka
孝也 草深
Yoichiro Goto
後藤  陽一郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP11140599A priority Critical patent/JP2000331518A/en
Publication of JP2000331518A publication Critical patent/JP2000331518A/en
Pending legal-status Critical Current

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  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a surface light source device having stable and favorable illumination characteristics by preventing corrugation of a polarized light separating sheet even under usage in dry and wet conditions different from conditions during assembly for avoiding a function degradation of the polarized light separating sheet, and also to provide a light guide plate used in this surface light source device and a display device using this surface light source device. SOLUTION: Projection parts 34 are provided on a peripheral vicinity of an emitting surface 32 of a light guide plate 3, and a polarized light separating sheet 7 is formed in a size smaller than the emitting surface 32 and fitting in a surface not having the projection parts 34 formed, and is provided so as to be not laminated on the projection parts 34 above the emitting surface 32 of the light guide plate 3. Thus, when these are combined with a liquid crystal display panel 8, because the polarized light separating sheet 7 is not suppressed by the light guide plate 3 and the liquid crystal display panel 8 and a distance with the liquid crystal display panel 8 is regulated by the projections 34 for securing a space, the polarized light separating sheet 7 is allowed to freely expand and contract within this space.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、面光源装置、その
面光源装置に用いられる導光板、及びその面光源装置を
用いた表示装置に関し、特に偏光分離シートを用いる面
光源装置に関するものである。
The present invention relates to a surface light source device, a light guide plate used in the surface light source device, and a display device using the surface light source device, and more particularly to a surface light source device using a polarization separation sheet. .

【0002】[0002]

【従来の技術】液晶表示装置に代表される非発光表示装
置においては、例えば、デジタルスチルカメラやビデオ
カメラ、あるいは携帯用液晶テレビ等の製品に組み込ま
れる際に、その照明のため背面にはバックライトユニッ
トが設けられる。表示画面の視認性や良好な画質を得る
べく、バックライトユニットには均一で高い輝度を呈す
る照明性能が要求される。
2. Description of the Related Art In a non-light-emitting display device represented by a liquid crystal display device, for example, when it is incorporated in a product such as a digital still camera, a video camera, or a portable liquid crystal television, a back light is provided on the rear surface for illumination. A light unit is provided. In order to obtain the visibility of the display screen and good image quality, the backlight unit is required to have uniform and high luminance illumination performance.

【0003】バックライトユニットの輝度を向上させる
ために、バックライトユニットの構成要素である導光板
から出射される光のうち、P偏光を透過させS偏光を反
射させる、あるいは右回り円偏光を通過させ左回り円偏
光を反射させる偏光分離シートを備えて、バックライト
ユニットからの照明輝度を向上させるものが実用化され
ている(例えば、特開平8−87011号公報、特開平
10−253830号公報参照)。
In order to improve the brightness of the backlight unit, of the light emitted from the light guide plate which is a component of the backlight unit, it transmits P-polarized light and reflects S-polarized light, or passes right-handed circularly polarized light. Japanese Patent Application Laid-Open Nos. H8-87011 and H10-253830 disclose a polarization separation sheet that reflects left-handed circularly polarized light and improves the illumination luminance from a backlight unit. reference).

【0004】図4において、導光板42の側面から入射
した光源41からの光は、導光板42内を通過しつつ、
反射板43で反射され、あるいは図示しない底面に設け
られた拡散手段で拡散されて導光板42の上面から出射
される。導光板42から出射された光は、レンズシート
44を介して偏光分離シート45に入る。そして、偏光
分離シート45は、入射した光のうち所望の偏光成分を
通過し、そうでない偏光成分を反射する。偏光分離シー
ト44を通過した(偏光成分の)光は、液晶パネル46
へと進みこれを裏面から照明する。偏光分離シート45
で反射された偏光成分は、レンズシート44を介して導
光板42に入射され、導光板42の裏面あるいは反射板
43で反射されて、所望の偏光成分の光となる。この反
射により偏光分離シートで反射された偏光成分の光も所
望の偏光成分に変わるので、反射後には、レンズシート
44、偏光分離シート45を通過し、液晶パネル46を
照明することになる。
In FIG. 4, light from a light source 41 incident from a side surface of a light guide plate 42 passes through the inside of the light guide plate 42,
The light is reflected by the reflection plate 43 or diffused by a diffusion means provided on the bottom surface (not shown) and is emitted from the upper surface of the light guide plate 42. Light emitted from the light guide plate 42 enters the polarization separation sheet 45 via the lens sheet 44. Then, the polarization separation sheet 45 transmits a desired polarization component of the incident light and reflects a polarization component that is not. The light (of the polarization component) that has passed through the polarization separation sheet 44 is
Go to and illuminate this from the back. Polarization separation sheet 45
Is reflected by the light guide plate 42 via the lens sheet 44, and is reflected by the back surface of the light guide plate 42 or the reflection plate 43 to become light of a desired polarization component. The light of the polarized light component reflected by the polarized light separating sheet is also changed into a desired polarized light component by the reflection, so that after reflection, the light passes through the lens sheet 44 and the polarized light separating sheet 45 to illuminate the liquid crystal panel 46.

【0005】液晶パネル46は、元来、一方の偏光成分
の光について、その通過の可否により表示を行うもので
あるから、照明光としては一方の偏光成分のみの光で良
い。このため、偏光分離シートを用いることで、他方の
偏光成分を一方の偏光成分の光として利用でき、斯様な
バックライトユニットでは、光源からの光の効率的な利
用がされ、照明輝度の向上が可能である。
Since the liquid crystal panel 46 originally performs display of light of one polarization component depending on whether or not the light passes, the illumination light may be light of only one polarization component. Therefore, by using the polarized light separating sheet, the other polarized light component can be used as the light of one polarized light component. In such a backlight unit, the light from the light source is efficiently used, and the illumination luminance is improved. Is possible.

【0006】[0006]

【発明が解決しようとする課題】さて、偏光分離シート
やレンズシートは、導光板と液晶パネルの間にあってそ
の位置からずれたり脱落したりしないように、粘着テー
プ等の固定手段で固定あるいは液晶パネルと導光板とで
挟持するように構成されている。
The polarized light separating sheet and the lens sheet are fixed between the light guide plate and the liquid crystal panel with fixing means such as an adhesive tape or the like so as not to be displaced or fall off from the position. And a light guide plate.

【0007】しかしながら、組立時の乾湿状態と使用時
の乾湿状態が異なると、偏光分離シートに伸縮が発生す
る。高温多湿状態では、偏光分離シートは膨張して伸長
状態となり、波打ってしまう。これは、偏光分離シート
が導光板に固定されていたり、導光板と液晶パネルとに
抑えられて自由な伸縮ができないためであり、特に偏光
分離シートにおいては、面内の縦横方向での熱膨張係数
が異なるため波打ち現象が顕著に現れると考えられる。
However, if the dry and wet state during assembly differs from the dry and wet state during use, expansion and contraction occurs in the polarized light separating sheet. In a high-temperature and high-humidity state, the polarized light separating sheet expands to an elongated state, and undulates. This is because the polarized light separating sheet is fixed to the light guide plate, or cannot be freely expanded and contracted by being restrained by the light guide plate and the liquid crystal panel. It is considered that the waving phenomenon appears remarkably because the coefficients are different.

【0008】そして、偏光分離シートが波打ってしまう
と、偏光分離シートに所望の角度で光が入射されなくな
るため、偏光分離シートとしての機能が果たせず、面光
源装置としての良好な照明特性、更には表示装置として
の良好な表示特性が得られなくなってしまう。
If the polarized light separating sheet undulates, light does not enter the polarized light separating sheet at a desired angle, so that the function as the polarized light separating sheet cannot be fulfilled. Further, good display characteristics as a display device cannot be obtained.

【0009】本発明は、斯様な点に鑑みてなされたもの
で、組立時とは異なる乾湿状態下における使用において
も、良好な照明特性を得ることのできる面光源装置、そ
の面光源装置に用いられる導光板、更にはその面光源装
置を用いた良好な表示特性を得ることのできる表示装置
を提供するものである。
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and has been developed for a surface light source device and a surface light source device capable of obtaining good illumination characteristics even when used in a dry and wet state different from the time of assembly. An object of the present invention is to provide a light guide plate to be used, and a display device capable of obtaining good display characteristics using the surface light source device.

【0010】[0010]

【課題を解決するための手段】請求項1に係る本発明の
面光源装置は、光が入射される入射面と、入射した光を
出射する出射面と、出射面と対向する対向面とを有し、
出射面には出射面の周辺近傍に設けられた突起部を有す
る導光板と、導光板の対向面と対向して設けられる反射
板と、出射面より小さく突起部の形成されていない面に
納まる大きさに形成され、導光板の出射面上方に設けら
れ且つ突起部上に積層されない偏光分離シートとを具備
することを特徴とする。
According to a first aspect of the present invention, there is provided a surface light source device comprising: an incident surface on which light is incident; an exit surface for emitting the incident light; and a facing surface facing the exit surface. Have
The light emitting plate has a light guide plate having a protrusion provided near the periphery of the light output surface, a reflector provided opposite to the opposing surface of the light guide plate, and fits on a surface smaller than the light output surface and on which no protrusion is formed. And a polarizing separation sheet which is formed in a size, is provided above the emission surface of the light guide plate, and is not laminated on the protrusion.

【0011】請求項2に係る本発明の面光源装置は、請
求項1に記載の発明であって、出射面には複数の突起部
が出射面の周辺近傍の対向する位置に配設されているこ
とを特徴とする。
According to a second aspect of the present invention, there is provided the surface light source device according to the first aspect, wherein a plurality of protrusions are disposed on the exit surface at positions facing each other near the periphery of the exit surface. It is characterized by being.

【0012】請求項3に係る本発明の面光源装置は、請
求項1または2に記載の発明であって、出射面上方に設
けられ、突起部に対応した切り欠きを有するレンズシー
トあるいは拡散シートを備えることを特徴とする。
According to a third aspect of the present invention, there is provided the surface light source device according to the first or second aspect, wherein the lens sheet or the diffusion sheet is provided above the light exit surface and has a cutout corresponding to the projection. It is characterized by having.

【0013】請求項4に係る本発明の導光板は、光が入
射される入射面と、入射した光を出射する出射面と、出
射面と対向する対向面とを有し、出射面には出射面の周
辺近傍に設けられた突起部を備えることを特徴とする。
According to a fourth aspect of the present invention, there is provided a light guide plate having an incident surface on which light is incident, an exit surface for emitting the incident light, and a facing surface facing the exit surface. It is characterized by having a projection provided near the periphery of the light exit surface.

【0014】請求項5に係る本発明の導光板は、請求項
4に記載の発明であって、出射面には複数の突起部が出
射面の周辺近傍の対向する位置に配設されていることを
特徴とする。
According to a fifth aspect of the present invention, there is provided the light guide plate according to the fourth aspect, wherein a plurality of protrusions are disposed on the light exit surface in opposing positions near the periphery of the light exit surface. It is characterized by the following.

【0015】請求項6に係る本発明の表示装置は、請求
項1乃至3のいずれかに記載の面光源装置と、突起部に
当接して設けられる非発光表示手段とを備えることを特
徴とする。
According to a sixth aspect of the present invention, there is provided a display device comprising the surface light source device according to any one of the first to third aspects, and non-light emitting display means provided in contact with the projection. I do.

【0016】[0016]

【実施の形態】以下、本発明の実施の形態を図に基づい
て説明する。
Embodiments of the present invention will be described below with reference to the drawings.

【0017】図1は本発明に係る面光源装置及び表示装
置の概略断面図、図2は本発明に係る面光源装置及び表
示装置の分解構成図である。
FIG. 1 is a schematic sectional view of a surface light source device and a display device according to the present invention, and FIG. 2 is an exploded configuration diagram of the surface light source device and the display device according to the present invention.

【0018】1は導光板の入射面と対向配置される冷陰
極蛍光灯等の内部光源、2は光源1の後方・周囲を囲ん
で光源1からの光を入射面に効率良く導くためのリフレ
クタである。
Reference numeral 1 denotes an internal light source such as a cold-cathode fluorescent lamp arranged opposite to the incident surface of the light guide plate, and 2 a reflector for efficiently guiding the light from the light source 1 to the incident surface by surrounding the rear and periphery of the light source 1. It is.

【0019】3は透光性材料からなる導光板で、光源1
からの光が入射される入射面31、入射面31より入射
された光が出射する出射面32、出射面32に対向する
対向面である裏面33を備える。図示しないが裏面33
には反射・拡散手段としての拡散パターンが形成されて
おり、拡散パターンは、入射面31方向から導入される
光が出射面32にて均一な輝度で出射するように適宜パ
ターン設計されている。
Reference numeral 3 denotes a light guide plate made of a translucent material.
An incident surface 31 on which light from the light source enters, an exit surface 32 from which light incident from the incident surface 31 exits, and a back surface 33 which is a facing surface facing the exit surface 32. Although not shown, the back surface 33
Is formed with a diffusion pattern as reflection / diffusion means, and the diffusion pattern is appropriately designed so that light introduced from the direction of the incident surface 31 is emitted from the emission surface 32 with uniform luminance.

【0020】導光板3の出射面32には、出射面の周辺
近傍に突起部34が形成されている。本実施例では、こ
の突起部34は複数個設けられ、更に、出射面の中心を
挟んで夫々の対向する位置に他の突起部が位置するよう
に設けられている(図2、図3参照)。この突起部34
は、後述する液晶表示パネルの表示領域外と対向する部
分に設けられるので、突起部34による表示領域での輝
度むら発生等の照明特性を損なう虞は殆どなく、仮に表
示領域と対向する部分に設けられたとしても、出射面に
対して小さな占有割合で形成されるので、照明特性に大
きな影響を与えることはない。例えば2インチ用の表示
装置の場合には、出射面32の大きさはおよそ縦40.
7×横49.0mmで、突起部34は縦3×横1×高さ
0.65mmに形成される。35は太陽光や室内光等の
外光を取入れる外光により液晶表示パネルを照明するた
めの外光入射面である。
On the exit surface 32 of the light guide plate 3, a projection 34 is formed near the periphery of the exit surface. In the present embodiment, a plurality of the projections 34 are provided, and further, the other projections are provided so as to be located at opposing positions with respect to the center of the emission surface (see FIGS. 2 and 3). ). This projection 34
Is provided in a portion facing the outside of the display area of the liquid crystal display panel, which will be described later. Therefore, there is almost no risk of impairing the illumination characteristics such as uneven brightness in the display area due to the projections 34. Even if it is provided, it is formed with a small occupation ratio with respect to the emission surface, and thus does not significantly affect the illumination characteristics. For example, in the case of a display device for 2 inches, the size of the emission surface 32 is approximately 40.
The protrusion 34 is formed to be 3 × 1 × 1 × 0.65 mm in height. Reference numeral 35 denotes an external light incident surface for illuminating the liquid crystal display panel with external light that receives external light such as sunlight or indoor light.

【0021】尚、斯様な導光板は、通常、熱可塑性樹脂
を用いた射出成形により形成されるので、金型に突起部
とは逆の凹凸形状を形成しておけば、一般的な成形工程
により突起部を一体的に備えた導光板は容易に形成可能
である。
Since such a light guide plate is usually formed by injection molding using a thermoplastic resin, if a concave and convex shape opposite to the projection is formed in a mold, a general molding method is used. According to the process, a light guide plate integrally provided with a protrusion can be easily formed.

【0022】4は裏面33と対向して設けられた反射板
としての反射シート、5は出射面32から出射された光
を均一に分布させるための拡散シート、6は拡散シート
5を通過してきた光を集光して狭い角度での出射するレ
ンズシートである。拡散シート5及びレンズシート6
は、厚さは例えば0.13mm、0.145mmで、夫
々には、突起部34に対応した切り欠き51、61が設
けられており(図2、図3参照)、組立時には突起部3
4と切り欠き51、61が係合される。尚、拡散シート
やレンズシートは、比較的可撓性があり、加工もしやす
いので、切り欠きの形成は容易になされる。
Reference numeral 4 denotes a reflection sheet as a reflection plate provided opposite to the back surface 33, 5 denotes a diffusion sheet for uniformly distributing light emitted from the emission surface 32, and 6 denotes a light passing through the diffusion sheet 5. It is a lens sheet that collects light and emits it at a narrow angle. Diffusion sheet 5 and lens sheet 6
Have a thickness of, for example, 0.13 mm and 0.145 mm, and are provided with cutouts 51 and 61 corresponding to the projections 34 (see FIGS. 2 and 3), respectively.
4 and the notches 51, 61 are engaged. The diffusion sheet and the lens sheet are relatively flexible and easy to process, so that the notch can be easily formed.

【0023】7は入射する光のうち一方の偏光成分(例
えばP偏光)を透過し、他方の偏光成分(例えばS偏
光)を反射する偏光分離シートである。偏光分離シート
7は四角に形成されており、出射面32を覆うと共に突
起部34上に積層されない大きさ、即ち、出射面32全
体の大きさより小さく、突起部34の形成されていない
面に納まる大きさに形成されている。本実施例では、偏
光分離シートは、突起部34と出射面32の周辺(外
周)とで規制される矩形の面内に納まる大きさに形成さ
れているが、例えば突起部が出射面32の4つの辺全て
に設けられている場合は、突起部だけで規制される矩形
の面内に納まる大きさに形成される。偏光分離シートの
厚さは、例えば0.13mmである。
Reference numeral 7 denotes a polarization separation sheet that transmits one polarized light component (for example, P-polarized light) of the incident light and reflects the other polarized light component (for example, S-polarized light). The polarized light separating sheet 7 is formed in a square shape, and covers the emission surface 32 and has a size that is not laminated on the projection 34, that is, smaller than the entire size of the emission surface 32, and fits on the surface where the projection 34 is not formed. It is formed in size. In the present embodiment, the polarization separating sheet is formed to have a size that fits within a rectangular surface regulated by the projection 34 and the periphery (outer periphery) of the emission surface 32. When provided on all four sides, it is formed to have a size that fits within a rectangular plane regulated only by the protrusions. The thickness of the polarization separation sheet is, for example, 0.13 mm.

【0024】8は偏光分離シート7の上方に設けられる
非発光表示手段としての透過型の液晶表示パネルであ
る。
Reference numeral 8 denotes a transmissive liquid crystal display panel provided as a non-light emitting display means provided above the polarization separating sheet 7.

【0025】さて、図に示すように組み上がり状態で
は、光源1及びリフレクタ2は入射面31に対峙して設
けられ、反射シート4は導光板の裏面33及び光源とは
対峙しない側面を覆う様に設けられる(図2参照)。拡
散シート5及びレンズシート6は図3に示すように突起
部34と切り欠き51、61を係合させた状態で出射面
32上に積層される。この時、拡散シート5及びレンズ
シート6は、粘着テープ等により固定されることなく、
突起部34と切り欠き51、61の係合により出射面3
2上での位置決めがされる。このとき、突起部34に対
する切り欠き51、61の大きさを適当にすれば、拡散
シート5やレンズシート6の出射面32上での大きな位
置ずれの虞は殆どない。
In the assembled state as shown in the figure, the light source 1 and the reflector 2 are provided so as to face the incident surface 31, and the reflection sheet 4 covers the back surface 33 of the light guide plate and the side surface not facing the light source. (See FIG. 2). As shown in FIG. 3, the diffusion sheet 5 and the lens sheet 6 are stacked on the emission surface 32 with the projections 34 and the notches 51 and 61 engaged. At this time, the diffusion sheet 5 and the lens sheet 6 are not fixed by an adhesive tape or the like,
The projection surface 34 and the notches 51 and 61 are engaged with each other, so that the emission surface 3 is formed.
2 is positioned. At this time, if the size of the cutouts 51 and 61 with respect to the protrusion 34 is appropriately set, there is almost no possibility of a large positional shift on the emission surface 32 of the diffusion sheet 5 or the lens sheet 6.

【0026】次いで、偏光分離シート7は、図3に示す
ように、出射面32の上方、レンズシート6の上に積層
されるが、出射面32の大きさより小さく、突起部34
の形成されていない面に納まる大きさに形成されてお
り、突起部34の上に積層されない位置、即ち突起部3
4を覆うことなく積層される。このとき偏光分離シート
7を、突起部34あるいは突起部34と出射面32の周
辺(外周)により規制される大きさに、本実施例では出
射面32の周辺(外周)の一部と突起部34とで規制さ
れる矩形とほぼ同じくらいの大きさに形成しておくこと
で、偏光分離シート7が出射面32(レンズシート6)
の上で大きく位置がずれる虞はない。尚このとき、組立
作業の容易性や偏光分離シートの脱落防止のために、偏
光分離シートの伸縮を損なわない程度に、偏光分離シー
トの一部をレンズシートに両面テープ等で固定していて
も良い。
Next, as shown in FIG. 3, the polarized light separating sheet 7 is laminated on the lens sheet 6 above the light exit surface 32.
Are formed so as to fit on the surface where no protrusions are formed, and are not stacked on the protrusions 34, that is, the protrusions 3
4 without being covered. At this time, the size of the polarization separating sheet 7 is regulated by the projection 34 or the projection 34 and the periphery (outer periphery) of the emission surface 32. By forming the polarization separation sheet 7 in a size substantially equal to the size of the rectangle regulated by the light exiting surface 34, the exit surface 32 (lens sheet 6)
There is no danger that the position will be greatly displaced. At this time, in order to facilitate the assembling work and to prevent the polarized light separating sheet from falling off, even if a part of the polarized light separating sheet is fixed to the lens sheet with a double-sided tape or the like to the extent that the expansion and contraction of the polarized light separating sheet is not impaired. good.

【0027】そして、偏光分離シートの上方には、図1
に示すように液晶表示パネル8が突起部34上に当接し
た状態で積層されて表示装置の組み上がり状態となる。
この際、偏光分離シート7は、突起部34と液晶表示パ
ネル8との間に介在せず、突起部34(導光板)と液晶
表示パネル8とで挟持される(抑えられる)ことなく、
導光板(出射面32)上に備えられる。更に、液晶表示
パネル8は突起部34と当接することにより導光板との
距離が規制されるので、導光板3と液晶表示パネル8と
の間に空間が確保されて、この空間内での偏光分離シー
ト7の自由な伸縮が許容される。
Then, above the polarized light separating sheet, FIG.
As shown in (1), the liquid crystal display panel 8 is stacked in a state in which the liquid crystal display panel 8 is in contact with the projection 34, and the display device is assembled.
At this time, the polarization separation sheet 7 is not interposed between the protrusion 34 and the liquid crystal display panel 8, and is not sandwiched (suppressed) between the protrusion 34 (light guide plate) and the liquid crystal display panel 8.
It is provided on the light guide plate (output surface 32). Further, since the distance between the liquid crystal display panel 8 and the light guide plate is regulated by contacting the projection 34, a space is secured between the light guide plate 3 and the liquid crystal display panel 8, and the polarization in this space is ensured. Free expansion and contraction of the separation sheet 7 is allowed.

【0028】このように、使用時の乾湿状態に応じて、
偏光分離シート7は上記空間内で自由に伸縮することが
できるので、例え高温多湿状態であっても、偏光分離シ
ート7が波打つことを防止しうる。よって、使用時の乾
湿状態に関わらず、偏光分離シート7への光の入射角度
を安定したものとすることができ、偏光分離シートとし
ての機能が果たされる。而して、良好な照明特性が得ら
れる面光源装置を、更には良好な表示特性が得られる表
示装置を提供することが可能になる。
As described above, according to the dry / humid condition at the time of use,
Since the polarized light separating sheet 7 can freely expand and contract in the space, it is possible to prevent the polarized light separating sheet 7 from waving even in a high temperature and high humidity state. Accordingly, the incident angle of light on the polarization separation sheet 7 can be stabilized regardless of the dry and wet state at the time of use, and the function as the polarization separation sheet is achieved. Thus, it is possible to provide a surface light source device that can obtain good illumination characteristics and a display device that can obtain good display characteristics.

【0029】また本発明では、偏光分離シートは出射面
より小さく突起部の形成されていない面に納まる大きさ
に形成され、突起部34あるいは突起部34と出射面3
2の周辺(外周)により規制される大きさに形成されて
おり、更に実施例では出射面32の周辺(外周)の一部
と突起部34とで規制される矩形とほぼ同じくらいの大
きさに形成されている。
In the present invention, the polarized light separating sheet is formed to have a size smaller than the light exit surface and to fit on the surface on which no protrusion is formed, and the protrusion 34 or the protrusion 34 and the light exit surface 3 are formed.
2 is formed in a size regulated by the periphery (outer periphery) of the light emitting device 2, and in this embodiment, the size is substantially the same as a rectangle regulated by a part of the periphery (outer periphery) of the emission surface 32 and the projection 34. Is formed.

【0030】通常、偏光分離シートは多層構造を有し、
レンズシートに比べると可撓性が低く、また剛性も高い
ので、細かい加工がしにくい。そして、偏光分離シート
の位置決めのために例えば舌片や切り欠き等の細かい加
工を施した場合、その加工精度は良くなく、また端部で
破損や構成層間の剥離等が発生しやすく、偏光分離シー
トとしての性能が損なわれる虞がある。これに対し、本
発明では、上述の如く偏光分離シートを構成しているの
で、偏光分離シートに細かい加工を施さなくても容易に
位置決めがなされ、また、矩形に形成することで、端部
での破損や構成層間の剥離等の発生を抑えることに寄与
できる。
Usually, the polarized light separating sheet has a multilayer structure,
Since it has low flexibility and high rigidity as compared with the lens sheet, it is difficult to perform fine processing. When fine processing such as a tongue piece or a notch is performed for positioning the polarization separation sheet, the processing accuracy is not good, and breakage or peeling between constituent layers is likely to occur at an end portion. There is a possibility that the performance as a sheet may be impaired. On the other hand, in the present invention, since the polarization separation sheet is configured as described above, the polarization separation sheet can be easily positioned without performing fine processing on the polarization separation sheet. This can contribute to suppressing the occurrence of breakage and separation between constituent layers.

【0031】さて、本実施例では偏光分離シートはレン
ズシートや拡散シートの上方に積層されたが、これに限
ることはなく、夫々の特性に応じて積層される順序は適
宜変更される。また、偏光分離シートの上方にレンズシ
ートや拡散シートが積層される場合は、偏光分離シート
が突起部上に積層されなければ、レンズシートや拡散シ
ートが突起部上に積層されこれらの部材を介して液晶表
示パネルが突起部と当接する構成であっても構わない。
In the present embodiment, the polarized light separating sheet is laminated above the lens sheet and the diffusion sheet. However, the present invention is not limited to this, and the laminating order may be appropriately changed according to each characteristic. In addition, when a lens sheet or a diffusion sheet is laminated above the polarization separation sheet, unless the polarization separation sheet is laminated on the projection, the lens sheet or diffusion sheet is laminated on the projection and these members are interposed. In this case, the liquid crystal display panel may be in contact with the protrusion.

【0032】また本実施例では、突起部は出射面上でそ
の周辺近傍に複数個設けられているが、これに限ること
はなく、多少位置決めの精度は落ちるものの、出射面上
の周辺近傍の一個所に設けられるものであっても良い。
この場合、偏光分離シートは突起部と出射面の周辺(外
周)により規制される大きさに形成されることになる。
In this embodiment, a plurality of projections are provided on the emission surface near the periphery thereof. However, the present invention is not limited to this. It may be provided in one place.
In this case, the polarization separation sheet is formed in a size regulated by the protrusions and the periphery (outer periphery) of the emission surface.

【0033】[0033]

【発明の効果】本発明は、以上の説明から明らかなよう
に、導光板の出射面上でその周辺近傍に突起部を設け、
偏光分離シートを出射面より小さく突起部の形成されて
いない面に納まる大きさに形成し、導光板の出射面上方
に且つ突起部上に積層されないように設けることによ
り、液晶表示パネルと組み合わされた時に、偏光分離シ
ートが導光板と液晶表示パネルとで抑えられることがな
くなり、突起部によって液晶表示パネルとの距離が規制
されて空間が確保されるので、この空間内での偏光分離
シートの自由な伸縮が許容される。これにより、使用時
の乾湿状態に応じて偏光分離シートは上記空間内で自由
に伸縮することができるので、例え高温多湿状態であっ
ても、偏光分離シートが波打つことが防止される。
According to the present invention, as is apparent from the above description, a projection is provided on the exit surface of the light guide plate near its periphery,
The polarization separation sheet is formed to have a size smaller than the emission surface and fits on the surface on which the protrusions are not formed, and is provided above the emission surface of the light guide plate so as not to be laminated on the protrusions, thereby being combined with the liquid crystal display panel. In this case, the polarization separation sheet is no longer suppressed by the light guide plate and the liquid crystal display panel, and the distance between the polarization separation sheet and the liquid crystal display panel is regulated by the protrusions, so that a space is secured. Free expansion and contraction is allowed. Accordingly, the polarized light separating sheet can freely expand and contract in the space according to the dry / wet state at the time of use, thereby preventing the polarized light separating sheet from waving even in a high temperature and high humidity state.

【0034】依って、使用時の乾湿状態に関わらず、偏
光分離シートへの光の入射角度を安定したものとするこ
とができ、偏光分離シートとしての機能が果たされ、良
好な照明特性が得られる面光源装置を、更には良好な表
示特性が得られる表示装置を提供することができる。
Accordingly, the incident angle of light on the polarizing beam splitting sheet can be stabilized regardless of the dry / humid state at the time of use, and the function as the polarizing beam splitting sheet is fulfilled, and good illumination characteristics are obtained. It is possible to provide a surface light source device that can be obtained, and a display device that can obtain good display characteristics.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る一実施例の概略構成図である。FIG. 1 is a schematic configuration diagram of an embodiment according to the present invention.

【図2】本発明に係る一実施例の分解構成図である。FIG. 2 is an exploded configuration diagram of one embodiment according to the present invention.

【図3】本発明に係る一実施例の構成説明図である。FIG. 3 is a configuration explanatory view of one embodiment according to the present invention.

【図4】従来の表示装置の概略構成図である。FIG. 4 is a schematic configuration diagram of a conventional display device.

【符号の説明】 1 内部光源 2 リフレクタ 3 導光板 31 入射面 32 出射面 33 裏面(対向面) 34 突起部 4 反射シート 5 拡散シート 51 切り欠き 6 レンズシート 61 切り欠き 7 偏光分離シート 8 液晶表示パネル(非発光表示手段)[Description of Signs] 1 Internal light source 2 Reflector 3 Light guide plate 31 Incident surface 32 Output surface 33 Back surface (opposing surface) 34 Projection 4 Reflection sheet 5 Diffusion sheet 51 Notch 6 Lens sheet 61 Notch 7 Polarization separation sheet 8 Liquid crystal display Panel (non-luminous display means)

───────────────────────────────────────────────────── フロントページの続き (72)発明者 草深 孝也 大阪府守口市京阪本通2丁目5番5号 三 洋電機株式会社内 (72)発明者 後藤 陽一郎 大阪府守口市京阪本通2丁目5番5号 三 洋電機株式会社内 Fターム(参考) 2H091 FA08X FA08Z FA14Z FA16Z FA23Z FA26Z FA32Z FD06 FD13 LA18  ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takaya Kusabuka 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yoichiro Goto 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. F-term (reference) 2H091 FA08X FA08Z FA14Z FA16Z FA23Z FA26Z FA32Z FD06 FD13 LA18

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 光が入射される入射面と、入射した光を
出射する出射面と、出射面と対向する対向面とを有し、
出射面には出射面の周辺近傍に設けられた突起部を有す
る導光板と、導光板の対向面と対向して設けられる反射
板と、出射面より小さく突起部の形成されていない面に
納まる大きさに形成され、導光板の出射面上方に設けら
れ且つ突起部上に積層されない偏光分離シートとを具備
することを特徴とする面光源装置。
An incident surface on which light is incident, an exit surface for emitting the incident light, and an opposing surface facing the exit surface;
The light emitting plate has a light guide plate having a protrusion provided near the periphery of the light output surface, a reflector provided opposite to the opposing surface of the light guide plate, and fits on a surface smaller than the light output surface and on which no protrusion is formed. A polarized light separating sheet which is formed in a size, is provided above an emission surface of the light guide plate, and is not laminated on the protrusion.
【請求項2】 出射面には複数の突起部が出射面の周辺
近傍の対向する位置に配設されていることを特徴とする
請求項1記載の面光源装置。
2. The surface light source device according to claim 1, wherein a plurality of protrusions are arranged on the light exit surface at opposing positions near the periphery of the light exit surface.
【請求項3】 出射面上方に設けられ、突起部に対応し
た切り欠きを有するレンズシートあるいは拡散シートを
備えることを特徴とする請求項1または2に記載の面光
源装置。
3. The surface light source device according to claim 1, further comprising a lens sheet or a diffusion sheet provided above the emission surface and having a notch corresponding to the projection.
【請求項4】 光が入射される入射面と、入射した光を
出射する出射面と、出射面と対向する対向面とを有し、
出射面には出射面の周辺近傍に設けられた突起部を備え
ることを特徴とする導光板。
4. An incident surface on which light is incident, an exit surface for emitting incident light, and a facing surface facing the exit surface,
A light guide plate, comprising: a projection provided on an exit surface near a periphery of the exit surface.
【請求項5】 出射面には複数の突起部が出射面の周辺
近傍の対向する位置に配設されていることを特徴とする
請求項4記載の導光板。
5. The light guide plate according to claim 4, wherein a plurality of protrusions are provided on the light exit surface at opposing positions near the periphery of the light exit surface.
【請求項6】 請求項1乃至3のいずれかに記載の面光
源装置と、突起部に当接して設けられる非発光表示手段
とを備えることを特徴とする表示装置。
6. A display device comprising: the surface light source device according to claim 1; and non-light-emitting display means provided in contact with the projection.
JP11140599A 1999-05-20 1999-05-20 Surface light source device, light guide plate, and display device Pending JP2000331518A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11140599A JP2000331518A (en) 1999-05-20 1999-05-20 Surface light source device, light guide plate, and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11140599A JP2000331518A (en) 1999-05-20 1999-05-20 Surface light source device, light guide plate, and display device

Publications (1)

Publication Number Publication Date
JP2000331518A true JP2000331518A (en) 2000-11-30

Family

ID=15272460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11140599A Pending JP2000331518A (en) 1999-05-20 1999-05-20 Surface light source device, light guide plate, and display device

Country Status (1)

Country Link
JP (1) JP2000331518A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002311430A (en) * 2001-04-11 2002-10-23 Kyocera Corp Liquid crystal display
WO2006123472A1 (en) * 2005-05-20 2006-11-23 Sharp Kabushiki Kaisha Chassis for illumination unit, illumination unit having the chassis unit incorporated therein, display device, and television receiver
US7380972B2 (en) 2002-08-28 2008-06-03 Sharp Kabushiki Kaisha Lighting system and liquid crystal backlight device
JP2008129742A (en) * 2006-11-20 2008-06-05 Nohmi Bosai Ltd Display part for fire alarm receiver
USRE44197E1 (en) 2004-01-14 2013-05-07 Sharp Kabushiki Kaisha Display device lighting unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002311430A (en) * 2001-04-11 2002-10-23 Kyocera Corp Liquid crystal display
JP4721543B2 (en) * 2001-04-11 2011-07-13 京セラ株式会社 Backlight and liquid crystal display device
US7380972B2 (en) 2002-08-28 2008-06-03 Sharp Kabushiki Kaisha Lighting system and liquid crystal backlight device
USRE44197E1 (en) 2004-01-14 2013-05-07 Sharp Kabushiki Kaisha Display device lighting unit
WO2006123472A1 (en) * 2005-05-20 2006-11-23 Sharp Kabushiki Kaisha Chassis for illumination unit, illumination unit having the chassis unit incorporated therein, display device, and television receiver
US8197114B2 (en) 2005-05-20 2012-06-12 Sharp Kabushiki Kaisha Chassis for an illuminating unit, and an illuminating unit, a display device and a television receiver incorporating the chassis
JP2008129742A (en) * 2006-11-20 2008-06-05 Nohmi Bosai Ltd Display part for fire alarm receiver

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