JPH0777690A - The liquid crystal display device - Google Patents

The liquid crystal display device

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Publication number
JPH0777690A
JPH0777690A JP5225809A JP22580993A JPH0777690A JP H0777690 A JPH0777690 A JP H0777690A JP 5225809 A JP5225809 A JP 5225809A JP 22580993 A JP22580993 A JP 22580993A JP H0777690 A JPH0777690 A JP H0777690A
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JP
Japan
Prior art keywords
liquid crystal
lens
light
crystal panel
plate
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
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JP5225809A
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Japanese (ja)
Inventor
Toshiya Nishio
俊哉 西尾
Original Assignee
Sanyo Electric Co Ltd
Tottori Sanyo Electric Co Ltd
三洋電機株式会社
鳥取三洋電機株式会社
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Application filed by Sanyo Electric Co Ltd, Tottori Sanyo Electric Co Ltd, 三洋電機株式会社, 鳥取三洋電機株式会社 filed Critical Sanyo Electric Co Ltd
Priority to JP5225809A priority Critical patent/JPH0777690A/en
Publication of JPH0777690A publication Critical patent/JPH0777690A/en
Application status is Pending legal-status Critical

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Abstract

PURPOSE:To obtain the liquid crystal display device which has no interference fringe and is bright and high in display quality by combining a light diffusion sheet laminated on plural lens plates which are laminated on a light-transmissive flat plate and arranged so that lens ridge lines cross one another. CONSTITUTION:The light-transmissive flat plate 21, the lens plates 22 which are laminated on the flat plate 21 and arranged so that the lens ridge lines cross one another, and the light diffusion plate 23 laminated on the lens plates 22 are used as a light guide diffusing means 2 which is arranged on the back of a liquid crystal panel 1. The light guide diffusing means 2 for the liquid crystal panel 1 which has plural electrodes arranged in parallel is constituted by forming striped lenses so that the pitch of the lens ridge lines of the lens plates 22 is narrower than the pitch of the electrodes of the liquid crystal panel 1 and laminating the light diffusion sheet 23 on the lens plates 22. Consequently, even when the flat plate 21 is made thin, light is spread almost equally and made uniform in luminance by the diffusion sheet 23 before it reaches the liquid crystal panel 1, so neither interference nor a large decrease in luminance is caused.

Description

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

【0001】 [0001]

【産業上の利用分野】本発明は照明手段をもった液晶表示装置に関する。 The present invention relates to a liquid crystal display device having the lighting unit.

【0002】 [0002]

【従来の技術】従来より液晶表示装置においては、特開昭60−107020号公報に示されるように液晶分子を捩って電界効果型とし、液晶パネルの基板内面に直交配置させた電極を用いてマトリックス表示を行い、液晶パネル背面には照明手段を配置していた。 BACKGROUND OF THE INVENTION The liquid crystal display device conventionally includes a field effect by twisting the liquid crystal molecules as shown in JP-A-60-107020, using an electrode was arranged perpendicular to the inner surface of the substrate of the liquid crystal panel performs matrix display Te, the liquid crystal panel back was arranged illuminating means. そしてこのような液晶表示装置に用いる照明手段は、液晶表示装置が薄型になるように、液晶パネルの背面に導光板を配置して、その導光板の側面に光源を配置するものが用いられる。 The illumination means used for such a liquid crystal display device, such that the liquid crystal display device is thin, and a light guide plate disposed rear of the liquid crystal panel, is used as to place the light source on a side surface of the light guide plate. このような照明手段をもった液晶表示装置においては、広い表示面の全体にわたって照明の照度を均一にすると共に、光の利用効率を上げて照度を上げることが必要となり、このためには導光板は透明で光拡散効果の高いものが求められる。 In the liquid crystal display device having such a lighting means, broad with over the entire display surface to uniform the illuminance of illumination, to increase the utilization efficiency of light is required to increase the illuminance, light guide plate for this It sought those having a high transparent light diffusion effect.

【0003】 [0003]

【発明が解決しようとする課題】そこでこのような目的の導光板として、導光板の厚みを厚くして光拡散領域を確保するとともに導光板の表面または裏面にレンチキュラレンズのような筋状レンズをもった透明板を用いることを検討した。 [SUMMARY OF THE INVENTION Therefore the light guide plate such purposes, by increasing the thickness of the light guide plate streaky lenses, such as lenticular lens on the surface or back surface of the light guide plate while securing the light diffusion area It was examined by using a transparent plate with. これにより光の拡散性が向上し略均一照度が得られたが、筋状レンズと液晶パネルの電極が共に平行な直線部分を持つためにレンズ列と電極の直線列が互いに光干渉して、いわゆるモアレ縞が観察され、表示品位を著しく低下させるので不都合であった。 Although this way is substantially uniform illuminance to improve the diffusion of the light obtained, linear rows of lens rows and the electrodes in the electrode of stripe-like lens and liquid crystal panel with both parallel straight portions and light interfere with each other, so-called moiré fringes are observed, it was disadvantageous since significantly reduces the display quality. またレンズの稜線谷線の影響を強くうけ、全体的に照度が向上したとは言い難かった。 Also strongly influenced by the ridge valley line of the lens, has been difficult overall is called the illumination is improved.

【0004】 [0004]

【課題を解決するための手段】本発明は上述の点を考慮してなされたもので、液晶パネルの背面に配置する導光拡散手段として、光透過性の平板と、その平板の上に積層され、互いにレンズ稜線が交差する様に配置された複数のレンズ板と、そのレンズ板の上に積層された光拡散シートとを用いたものである。 The present invention SUMMARY OF] has been made in view of the above, as a light guide diffusion means disposed at the back of the liquid crystal panel, a light transmissive flat plate, laminated on the flat is one in which using a plurality of lenses plates arranged so as to intersect the lens edge line with each other, and a light diffusing sheet which is laminated on the lens plate.

【0005】また本発明は、平行して配置された複数の電極を有する液晶パネルに対して導光拡散手段には、光透過性の平板の上に積層されたレンズ板のレンズ稜線のピッチを液晶パネルの電極のピッチより狭くした筋状レンズとし、そのレンズ板の上に光拡散シートを積層したものである。 [0005] The present invention is light diffusing means to the liquid crystal panel having a plurality of electrodes arranged in parallel, the pitch of the lens ridges of laminated lens plate on the light transmissive flat plate and narrow the streaky lens than the pitch of the liquid crystal panel electrode, in which a light diffusion sheet is stacked on the lens plate.

【0006】 [0006]

【作用】これにより平板を薄くしても光が略均一に広がり、しかも光が液晶パネルに届く迄に拡散シートによりレンズの稜線や谷線による輝度の強弱が均されるので、 [Action] Accordingly spread substantially even light by reducing the flat uniform, and since the light brightness of the intensity by ridge and valley line of the lens by the diffusion sheet until reaching the liquid crystal panel is flattened,
干渉や著しい輝度低下は生じない。 Interference and significant reduction in luminance does not occur.

【0007】 [0007]

【実施例】図1は本発明の実施例の液晶表示装置の分解斜視図で、図2はその要部断面図である。 An exploded perspective view of a liquid crystal display device of the embodiment of Embodiment] FIG. 1 is the present invention. FIG. 2 is a fragmentary sectional view. これらの図において、1は直交配置された電極を有する液晶パネルで、液晶を挾持する2枚の基板11の内面は各々平行して配置された複数の電極を有する。 In these drawings, 1 is a liquid crystal panel having orthogonal electrodes arranged, the inner surface of the two substrates 11 sandwiching the liquid crystal has a plurality of electrodes arranged in parallel, respectively. このような液晶パネル1は、例えば単純マトリクス型のTN、STNなどの電界効果型のものであるが、画素ごとにスイッチ素子や非線形素子を持つものであっても平行電極を持つものは適用でき、いずれも基板の表裏面には概ね偏光板12が貼付してあり、必要に応じて、周辺部に駆動素子13を具備したり、フレーム10などに収納されていてもよい。 The liquid crystal panel 1, for example, a simple matrix type TN, but is of the field-effect such as STN, apply those with parallel electrodes be those having a switching element and a nonlinear element for each pixel both Yes and generally sticking the polarizing plate 12 on the front and back surfaces of the substrate, if necessary, or provided with a driving element 13 to the peripheral portion, may be housed, such as the frame 10.

【0008】2は液晶の背面に配置された導光拡散手段であり、例えば、光透過性の平板21と、その平板21 [0008] 2 is arranged light diffusing means on the back of the liquid crystal, for example, a light transmissive flat plate 21, the flat plate 21
の上に積層され、互いにレンズ稜線が交差する様に配置された複数のレンズ板22と、そのレンズ板22の上に積層された光拡散シート23とからなるが、干渉縞を防ぐ意味では、光透過性の平板の上に、レンズ稜線のピッチが液晶パネルの電極のピッチより狭い筋状レンズを有した少なくとも1枚のレンズ板を積層し、さらにその上に光拡散シートを積層すればよい。 Is stacked on the, the plurality of lens plate 22 the lens ridge are arranged so as to intersect with each other, it consists of stacked light diffusion sheet 23 on top of the lens plate 22 in the sense of preventing interference fringes, on the light transmissive flat plate, the pitch of the lens ridge are stacked at least one lens plate having a narrow stripe-like lens than the pitch of the electrodes of the liquid crystal panel may be further stacked a light diffusion sheet thereon . またいずれの場合においても透光性の平板21としては例えばアクリル樹脂板でもよいが、裏面にドット状の反射塗料を有したアクリル樹脂板の積層体等を用いてもよい。 Or it may be, for example, an acrylic resin plate as the translucent flat plate 21 in any case, but may be used a laminate of acrylic resin plate having a dot-shaped reflective coating on the back. そして更にこれらの組合せ等において、透光性の平板21の裏面に反射シート24等の反射手段を貼付すれば光の利用効率が一層良くなるのでより好ましい。 And further in a combination thereof, more preferable because the light use efficiency becomes better if sticking a reflection means such as a reflective sheet 24 on the back surface of the transparent flat plate 21.

【0009】3は導光拡散手段2の側面に配置された光源で、例えば冷陰極管とか螢光灯であり、必要に応じて反射シート25で非接触に被われて光を効率よく導光拡散手段2の少なくとも平板21に導くように構成されていてもよい。 [0009] 3 is a light source disposed on a side surface of the light guide diffusion means 2, for example, cold cathode tube Toka fluorescent lamps, are covered in a non-contact reflection sheet 25 as needed efficiently guide light it may be configured to direct at least the flat plate 21 of the diffuser 2.

【0010】これらの構成において、透光性の平板21 [0010] In these configurations, the light-transmitting flat plate 21
は、例えば従来A4版の大きさの有効表示面に対する均一照明において15〜20mmの厚みが必要であったのに対して、本発明の実施例においては3mmでも略均一になるので、物理的な強度や液晶パネル1の光吸収性を考慮して2〜6mmとすることができ、無色透明もしくは表示品位を高めるような例えば淡緑色の着色透明な透明樹脂板や硝子板が利用できる。 Is, for example, whereas the thickness of 15~20mm was necessary in uniform illumination to the effective display surface of a conventional A4 size size, since the substantially uniform or 3mm in the embodiment of the present invention, physical the light absorption of the intensity and the liquid crystal panel 1 in consideration can be 2 to 6 mm, colorless and transparent or such for example a light to enhance the display quality green colored transparent transparent resin plate or a glass plate can be used. 一方レンズ板22は、 Meanwhile lens plate 22,
半円柱レンズ群を用いたレンチキュラレンズまたは鋸歯状もしくは三角柱状の柱状レンズ集合体からなり、光拡散集光効果が得られる材料、例えばポリエチレンテレフタレート、ポリプロピレン、アクリル、ポリカーボネート等の樹脂成形品が利用できる。 It consists lenticular lens or serrated or triangular columnar lens assembly using a semi-cylindrical lens group, the material light diffusing condensing effect can be obtained, for example, polyethylene terephthalate, polypropylene, acrylic, resin molded articles such as polycarbonate can be utilized . このようなレンズ板を用いるときには、液晶パネル1の厚さ50〜200nm When using such a lens plate, the liquid crystal panel 1 thickness 50~200nm
の電極はレンズ作用を持つので、電極と筋状レンズの稜線が例えば直接的に平行な状態に積層されると相互に光学干渉することでモアレ縞が表示の中に観察される。 Since the electrode has a lens action, Moire fringes are observed in the display by optically interfere with each other when the ridge of the electrode and the streaky lens is laminated directly to a parallel state, for example. 従ってこの現象のよく現れるレンズ稜線と電極のピッチが同じか又は筋状レンズ部の稜線ピッチが電極ピッチよりも大きい時は特に注意が必要である。 Thus when the ridge line pitch or the pitch of the well-appearing lens ridge and the electrode is the same or streaky lens portion of this phenomenon is larger than the electrode pitch is particularly caution. モアレ縞を減少させ若しくは発生させないようにするにはレンズの稜線と谷線による光学効果を緩和させればよいことになるが、 Although it is only necessary to mitigate the optical effect of the ridge line and the valley line of the lens to so as not to cause or generate reducing moire fringes,
そのような光学効果を打ち消すように処理したのでは光拡散集光効果を減ずることになるので、照度低下につながり好ましくない。 Since than processed so as to cancel such an optical effect will be to reduce the light diffusion condensing effect, unfavorably the illumination intensity. そこでモアレ縞が生じにくいようにする方法として、レンズ板を複数積層して稜線や谷線の光学的直線性を緩和するとか、レンズ稜線のピッチを液晶パネルの電極のピッチより狭くすると極めて効果があることが実験的に確認できた。 So as a method to make the moire fringes hardly occurs, extremely effective when Toka alleviating the optical linearity of ridge or valley line of the lens plate by stacking a plurality of the pitch of the lens ridge narrower than the pitch of the liquid crystal panel electrode it was confirmed experimentally that. またレンズ板の集光性によりレンズの稜線部分がキラキラ光って観察される場合があるが、これはレンズ効果で集光された光が直接観察者の目に触れないようにすればよい。 Also there is a case where the ridge line portion of the lens by light-collecting lens plate is observed glowing Glitter, which light condensed by the lens effect may be to touch the eye directly observer. このためには光拡散シート23を用いればよいが、同時に光拡散シート2 This may be used a light diffusing sheet 23 in order but at the same time the light diffusing sheet 2
3はレンズ稜線と谷線の光学的直線性を緩和する作用も持つ。 3 also has a function of relaxing the optical linearity of the lens ridge and valley line. 但し、光拡散シートのみでレンズ稜線と谷線の光学的直線性を緩和しようとすると光拡散シートが厚くなり、これは光吸収を伴うので好ましくない。 However, an attempt to alleviate the optical linearity of the light diffusion sheet only lens ridge and valley line light diffusing sheet is thick, which is undesirable because involve optical absorption.

【0011】これらのことから、例えば電極ピッチ22 [0011] From these facts, for example, electrode pitch 22
0〜100μmの液晶パネルに対して、レンズ稜線のピッチ1〜70μm厚さ0.08〜0.30mmのレンズ板2を互いに略直交するように2枚積層し、その上に厚さ0.1〜0.3mmの拡散シートを積層したところ、 Against 0~100μm liquid crystal panel, the lens plate 2 pitch 1~70μm thickness 0.08~0.30mm lens ridge are stacked two to substantially perpendicular to each other, thickness thereon 0.1 It was stacking the diffusion sheet of ~0.3mm,
従来よりも薄型で略均一照明ができ、更に平均照度が従来より20〜30%高い液晶表示装置が得られた。 Conventionally it is substantially uniformly illuminated by thin than further the average illuminance obtained from 20-30% higher liquid crystal display device is conventionally.

【0012】 [0012]

【発明の効果】以上の如く、従来よりも薄い透光性の平板を用いることができ、レンズ板と拡散シートの組み合わせで均一で照度の高い照明が行えるので、干渉縞のない、明るく、表示品位の高い液晶表示装置が提供できた。 As above, according to the present invention, conventionally it can be used a thin transparent flat plate than, the uniform allows high lighting illuminance by a combination of a diffusion sheet and the lens plate, without interference fringes, bright, display quality of high liquid crystal display device is able to provide.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の実施例にかかる液晶表示器の分解斜視図である。 1 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

【図2】本発明の実施例にかかる液晶表示器の要部断面図である。 Figure 2 is a fragmentary cross-sectional view of the liquid crystal display device according to an embodiment of the present invention.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 液晶パネル 2 導光拡散手段 21 平板 22 レンズ板 23 拡散シート 3 光源 1 liquid crystal panel 2 light diffusing means 21 flat 22 lens plate 23 diffusion sheet 3 sources

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 電極を有する液晶パネルと、液晶パネルの背面に配置された導光拡散手段と、導光拡散手段の側面に配置された光源とを有し、前記導光拡散手段は、光透過性の平板と、該平板の上に積層され、互いにレンズ稜線が交差する様に配置された複数のレンズ板と、該レンズ板の上に積層された光拡散シートとを具備したことを特徴とする液晶表示装置。 A liquid crystal panel having a 1. A electrode has a placed light diffusing means on the rear of the liquid crystal panel and a light source disposed on the side face of the light diffusing means, the light diffusing means, the light wherein the permeability of the flat plate, are stacked on top of the plate, a plurality of lenses plates arranged so as to intersect the lens edge line with each other, by comprising a light diffusion sheet stacked on said lens plate a liquid crystal display device.
  2. 【請求項2】 平行して配置された複数の電極を有する液晶パネルと、液晶パネルの背面に配置された導光拡散手段と、導光拡散手段の側面に配置された光源とを有し、前記導光拡散手段は、光透過性の平板と、該平板の上に積層されたレンズ稜線のピッチが液晶パネルの電極のピッチより狭い筋状レンズを有したレンズ板と、該レンズ板の上に積層された光拡散シートとを具備したことを特徴とする液晶表示装置。 It has a liquid crystal panel having a wherein parallel plurality of electrodes disposed, and arranged light diffusing means on the rear of the liquid crystal panel and a light source disposed on the side face of the light diffusion means, the light diffusing means includes an optically transparent flat plate, and lens plate pitch of the laminated lens ridge on the flat plate had a narrow stripe-like lens than the pitch of the liquid crystal panel electrodes, on the said lens plate a liquid crystal display device characterized by including a stacked light diffusion sheet.
JP5225809A 1993-09-10 1993-09-10 The liquid crystal display device Pending JPH0777690A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5225809A JPH0777690A (en) 1993-09-10 1993-09-10 The liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5225809A JPH0777690A (en) 1993-09-10 1993-09-10 The liquid crystal display device

Publications (1)

Publication Number Publication Date
JPH0777690A true JPH0777690A (en) 1995-03-20

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ID=16835136

Family Applications (1)

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JP5225809A Pending JPH0777690A (en) 1993-09-10 1993-09-10 The liquid crystal display device

Country Status (1)

Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6404468B1 (en) 1998-07-16 2002-06-11 Mitsubishi Denki Kabushiki Kaisha Liquid crystal display unit
JP2008293005A (en) * 2007-04-25 2008-12-04 Fujifilm Corp Liquid crystal display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6404468B1 (en) 1998-07-16 2002-06-11 Mitsubishi Denki Kabushiki Kaisha Liquid crystal display unit
JP2008293005A (en) * 2007-04-25 2008-12-04 Fujifilm Corp Liquid crystal display device

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