JPH04175726A - Liquid crystal optical device - Google Patents
Liquid crystal optical deviceInfo
- Publication number
- JPH04175726A JPH04175726A JP2304441A JP30444190A JPH04175726A JP H04175726 A JPH04175726 A JP H04175726A JP 2304441 A JP2304441 A JP 2304441A JP 30444190 A JP30444190 A JP 30444190A JP H04175726 A JPH04175726 A JP H04175726A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- optical device
- transparent substrate
- convex portion
- crystal optical
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 79
- 230000003287 optical effect Effects 0.000 title claims description 17
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 9
- 210000002858 crystal cell Anatomy 0.000 description 23
- 238000004364 calculation method Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 238000005530 etching Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005323 electroforming Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、液晶テレビ、液晶ビデオプロジェクタ等に用
いられる液晶パネルに関し、特に照明光を液晶パネルに
照射し投影レンズを介してスクリーンに拡大投影する液
晶プロジェクタに用いられる液晶光学装置に関する。Detailed Description of the Invention (Industrial Application Field) The present invention relates to a liquid crystal panel used in liquid crystal televisions, liquid crystal video projectors, etc., and in particular, the present invention relates to a liquid crystal panel used in liquid crystal televisions, liquid crystal video projectors, etc. The present invention relates to a liquid crystal optical device used in a liquid crystal projector.
（従来の技術）
一般に液晶パネルの全面積のうち画素配線や画素トラン
ジスタ（非晶質シリコン又は多結晶シリコンの薄膜トラ
ンジスタ）の占める面積が６０〜７０％であるため、各
画素毎に実際に照明光が透過しうる液晶開口窓の面積は
３０〜４０％と小さく、照明光のうち６０〜７０％は利
用できず無駄になってしまう。(Prior art) Generally, pixel wiring and pixel transistors (amorphous silicon or polycrystalline silicon thin film transistors) occupy 60 to 70% of the total area of a liquid crystal panel. The area of the liquid crystal aperture window through which the light can pass is as small as 30 to 40%, and 60 to 70% of the illumination light cannot be used and is wasted.
そこで、１画素毎に微小レンズを設け、これによって照
明光を液晶開口窓に集光させて照明の利用効率を上げ、
投影画像を明るくしようとする発明が多数出願されてい
る（例えば、特開昭６０４６５６２３号公報参照）。Therefore, a microlens is provided for each pixel, which focuses the illumination light onto the liquid crystal aperture window, increasing the efficiency of illumination usage.
Many inventions have been filed to brighten projected images (for example, see Japanese Patent Laid-Open No. 60465623).
（発明が解決しようとする課題）
従来の技術で述べたものにおいては、ごく概念的にしか
記載されておらず、実際大きな効果を得るためにどのよ
うな仕様で微小レンズ等を製作したらよいか具体的に示
されていないという問題点を有していた。(Problem to be solved by the invention) The conventional techniques described are only conceptually described, and it is difficult to know what kind of specifications should be used to manufacture a microlens etc. in order to actually obtain a great effect. The problem was that it was not specifically shown.
本発明は、従来の技術が有するこのような問題点に鑑み
てなされたものであり、その目的とするところは、実際
に実現可能性の高い液晶パネルとレンズアレイの組合せ
を構成し、かつシュミレーションにより照明の利用効率
を上げるための各構成部品の厚さ、屈折率およびレンズ
面の曲率半径との間に存在する数値関係を見い出し、投
影画像をより明るくすることができる液晶光学装置を提
供しようとするものである。The present invention has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to construct a combination of a liquid crystal panel and a lens array that is highly likely to be realized in practice, and to provide a simulation method. We aim to provide a liquid crystal optical device that can make projected images brighter by discovering the numerical relationship between the thickness of each component, the refractive index, and the radius of curvature of the lens surface in order to increase the efficiency of illumination use. That is.
（課題を解決するための手段）
上記課題を解決すべく本発明は、一対の透明基板で液晶
を挟持してなる液晶パネルにレンズアレイを配設して構
成する液晶光学装置において、前記透明基板の表面に前
記液晶の液晶開口窓に対向するように球面状の凸部を多
数形成して、前記レンズアレイとするとともに前記透明
基板の厚さｔと屈折￥ｘ ｎｏ、前記凸部の曲〉ネク半
径ｒと屈折率ｎ１との間に
ｒ ｎ 。(Means for Solving the Problems) In order to solve the above problems, the present invention provides a liquid crystal optical device configured by disposing a lens array on a liquid crystal panel in which a liquid crystal is sandwiched between a pair of transparent substrates. A number of spherical convex portions are formed on the surface of the liquid crystal so as to face the liquid crystal aperture windows of the liquid crystal to form the lens array, and the thickness t of the transparent substrate, the refraction x no, the curve of the convex portion> r n between the neck radius r and the refractive index n1.
なる関係を有するものである。They have the following relationship.
また、前記透明基板は、アルカリ成分を実質的に含まな
いいわゆる無アルカリガラス材料で製イ１してもよい。Further, the transparent substrate may be made of a so-called alkali-free glass material that does not substantially contain an alkali component.
また、前記透明基板の凸部を形成した面とは反対側の面
に、アルカリの析出を防止するコーティングを施すとよ
い。Further, it is preferable that a coating for preventing alkali precipitation be applied to the surface of the transparent substrate opposite to the surface on which the convex portion is formed.
更に、前記コーティングを透明導電膜で施してもよい。Furthermore, the coating may be a transparent conductive film.
（作用）
球面状の凸部によって照明光か液晶パネルの各液晶開口
窓に集光し照明光の利用効率が向上する。(Function) The spherical convex portion focuses the illumination light onto each liquid crystal aperture window of the liquid crystal panel, improving the utilization efficiency of the illumination light.
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the accompanying drawings.
第１図は本発明に係る液晶光学装置の断面図、第２図は
球面状凸部による光線の屈折状態を示す模式図である。FIG. 1 is a cross-sectional view of a liquid crystal optical device according to the present invention, and FIG. 2 is a schematic diagram showing a state of refraction of a light beam by a spherical convex portion.
液晶光学装置は、一対の透明基板である液晶セル基板１
，２で液晶３を挟持してなる液晶パネル４の照明光であ
る入射光線５側の液晶セル基板１の表面に液晶３の各画
素と１対１に対向するように球面状の凸部６を形成して
構成されている。なお、液晶セル基板１，２はアルカリ
をほとんど含まないガラス材料で製作され、凸部６を形
成した面とは反対側の面にはアルカリの析出を防止する
ために透明導電膜でコーティングを施しである。A liquid crystal optical device consists of a pair of transparent substrates, liquid crystal cell substrates 1.
, 2 sandwiching the liquid crystal 3. On the surface of the liquid crystal cell substrate 1 on the side of the incident light beam 5 which is the illumination light of the liquid crystal panel 4, a spherical convex portion 6 is provided so as to face each pixel of the liquid crystal 3 on a one-to-one basis. It is composed of The liquid crystal cell substrates 1 and 2 are made of a glass material containing almost no alkali, and the surface opposite to the surface on which the convex portion 6 is formed is coated with a transparent conductive film to prevent alkali precipitation. It is.
液晶３は各画素毎に光を透過可能な液晶開口窓７を有し
、それ以外の部分８は薄膜トランジスタ（ＴＰＴ）、画
素配線等で光を利用できない部分である。The liquid crystal 3 has a liquid crystal aperture window 7 that can transmit light for each pixel, and the other portions 8 are thin film transistors (TPTs), pixel wiring, etc., and cannot utilize light.
球面状の凸部６は、例えばＮｉスタンパを用いて２Ｐ樹
脂材料や熱硬化性樹脂材料を液晶セル基板１上にアレイ
状に付着形成するような方法で形成される。The spherical convex portions 6 are formed by, for example, depositing a 2P resin material or a thermosetting resin material on the liquid crystal cell substrate 1 in an array using a Ni stamper.
凸部６を成形するためのＮｉスタンバの形状原型、いわ
ゆる「マザー」は、例えばガラス基板にフォトリソグラ
フィ技術を用いて数μｍ径から＋数μｍ径程度の円形開
口を持つ金属マスクを形成し、これをフッ酸系のエッチ
ャントを用いて適当な時間エツチングすることにより製
作する。ガラスのエツチングはマスク開口部からほぼ等
力的に進行するため球面状の凹部が得られ、その曲率半
径はエツチング時間等によって制御できる。また、エツ
チング工程を２段階に分ける等の方法により、半球状よ
り浅い四部や隣接する四部同士か完全につながったいわ
ゆる稠密充填構造の球面状四部アレイを製作することが
できる（特願平２−２７７１２号参照）。The shape prototype of the Ni standby for forming the convex portion 6, the so-called "mother", is obtained by forming a metal mask having a circular opening with a diameter of several μm to + several μm on a glass substrate, for example, using photolithography technology. This is manufactured by etching it for an appropriate time using a hydrofluoric acid etchant. Since the etching of the glass proceeds almost uniformly from the mask opening, a spherical concave portion is obtained, and the radius of curvature of the concave portion can be controlled by the etching time and the like. Furthermore, by dividing the etching process into two steps, it is possible to fabricate a spherical four-part array with a so-called close-packed structure in which four parts shallower than a hemisphere or adjacent four parts are completely connected (Patent Application No. (See No. 27712).
液晶セル基板１，２としては、例えばコーニング社製の
７０５９基板や一般的なソーダライム基板等か適用でき
る。なお、プラスチック基板でもよい。As the liquid crystal cell substrates 1 and 2, for example, a 7059 substrate manufactured by Corning Corporation or a general soda lime substrate can be used. Note that a plastic substrate may also be used.
二のよ・うに（７て製作した球面状凹部アレイを用いて
一般的な電鋳方法によりＮｉマスタ（形状か反転して球
面状四部アレイとなる）をとり、更にこれを用いて電鋳
方法により「マザー」と同形状のＮｉスタンバか出来る
。Using the spherical concave array fabricated in step 7, a Ni master (the shape is reversed to form a spherical four-part array) is obtained using a general electroforming method, and then using this, an electroforming method is performed. By doing this, you can create a Ni standber with the same shape as the "mother".
そして、液晶セル基板１の表面に樹脂材料を塗布し１、
Ｎｉスタンバを密着させれば所望な球面状の凸部６のア
レイを製作することが出来る。Then, a resin material is applied to the surface of the liquid crystal cell substrate 1.
A desired array of spherical convex portions 6 can be manufactured by closely adhering the Ni standbar.
このようにし、て製作された球面状凸部６のアレイイ１
液晶セル基板１を凸部６か液晶３と反射側になるように
してもう一方の液晶セル基板２とで液晶３を挟持する。Array 1 of spherical convex portions 6 manufactured in this way
The liquid crystal cell substrate 1 is sandwiched between the other liquid crystal cell substrate 2 so that the convex portion 6 or the liquid crystal 3 is on the reflective side.
この時液晶３の各液晶開口窓７と各凸部６は１対１に対
向している。At this time, each liquid crystal aperture window 7 of the liquid crystal 3 and each convex portion 6 are opposed to each other on a one-to-one basis.
次に、第１図に示すような液晶光学装置を構成し、更に
照明光である入射光線５の利用効率を上げてより明るい
投影画像を得るためには、液晶セル基板１の屈折率と厚
さ、凸部６の曲率半径等に対して以下の様な数値限定条
件に従って光学系を構成する必要かある。Next, in order to configure a liquid crystal optical device as shown in FIG. 1, and further increase the utilization efficiency of the incident light beam 5, which is the illumination light, and obtain a brighter projected image, the refractive index and thickness of the liquid crystal cell substrate 1 must be adjusted. Now, it is necessary to configure the optical system according to the following numerical limitation conditions regarding the radius of curvature of the convex portion 6, etc.
ここで、液晶セル基板１の屈折率をｎ。、その厚さをｔ
、凸部の屈折率をｎ□、その曲率半径をｒとする。Here, the refractive index of the liquid crystal cell substrate 1 is n. , its thickness is t
, the refractive index of the convex portion is n□, and its radius of curvature is r.
照明光である略平行な入射光線５が球面状凸部６に入射
するとき、その球面で光線が屈折して凸レンズとして作
用する。この凸レンズ効果により入射光線５が液晶開口
窓７に出来るだけ多く入射する時が、照明光の利用効率
の最大時である。When a substantially parallel incident light ray 5, which is illumination light, enters the spherical convex portion 6, the light ray is refracted by the spherical surface and acts as a convex lens. When as much of the incident light ray 5 as possible enters the liquid crystal aperture window 7 due to this convex lens effect, the utilization efficiency of illumination light is at its maximum.
曲率半径ｒの凸部６の球面での屈折による凸レンズの焦
点距離ｆは、近軸条件が満足されていれば次式の関係が
ある。The focal length f of a convex lens due to refraction on the spherical surface of the convex portion 6 having a radius of curvature r has the following relationship if the paraxial condition is satisfied.
屈折光線を液晶開口窓７に集光させるためにはｆ ＝
ｔ ／ ｎ 、とすればよい。従って、ｊ＋ ｎｏｒ
ｒ。In order to focus the refracted light beam on the liquid crystal aperture window 7, f =
t/n. Therefore, j+ nor
r.
ｎｌの関係は基本的に
ｔ ／ ｎ ｏ＝ ｒ ／ （ｎニー１） （２）
となる必要がある。The relationship of nl is basically t/no=r/(nnee1) (2)
It is necessary to
しかしなから、球面による屈折効果は正の球面収差か大
きく発生してしまい、第２図に示すように近軸光線より
も周辺光線はもつと凸部６側に集光する。従って、入射
光線５の全エネルギーが最も小さい領域に集光する像点
■は前記近軸Ｊ１算による像点■よりも凸部６側に近く
なる。However, the refraction effect due to the spherical surface causes a large amount of positive spherical aberration, and as shown in FIG. 2, the peripheral rays are converged closer to the convex portion 6 than the paraxial rays. Therefore, the image point (2), which focuses the incident light ray 5 on the area where the total energy is the smallest, is closer to the convex portion 6 side than the image point (2) based on the above-mentioned paraxial J1 calculation.
そこで、実際に第１図に示す光学系により光線追跡を行
い、１画素の寸法を１００μｍ平方、液晶開口窓７の寸
法を２０μｍ平方としたときに球面の屈折によって液晶
開口窓７に入射する光線の本数を討算しその本数の最大
位置から実効的な焦点位置を算出（７た。Therefore, we actually traced the rays using the optical system shown in Figure 1, and when the size of one pixel was 100 μm square and the size of the liquid crystal aperture window 7 was 20 μm square, the rays that entered the liquid crystal aperture window 7 due to the refraction of the spherical surface. The effective focal position is calculated from the maximum position of the number of lenses (7).
第３図は各構成部品の所定屈折率における凸部の曲率半
径ｒと液晶セル基板１中の焦点距離との関係を示す計算
結果の一例である。液晶セル基板１としては、コーニン
グ社製７０５９基板を想定してｎｏ＝１．．５３とし、
液晶セル基板１の表面に樹脂材料を塗布し、Ｎｉスタン
バを密着して成形した凸部６の屈折率は樹脂材料からｎ
ｘ＝１．５２として計算した。FIG. 3 is an example of calculation results showing the relationship between the radius of curvature r of the convex portion and the focal length in the liquid crystal cell substrate 1 at a predetermined refractive index of each component. Assuming that the liquid crystal cell substrate 1 is a 7059 substrate manufactured by Corning, no=1. ．． 53,
The refractive index of the convex portion 6 formed by applying a resin material to the surface of the liquid crystal cell substrate 1 and closely adhering it to a Ni standby is n from the resin material.
Calculated with x=1.52.
第３図中、横軸は球面状凸部６の曲率半径ｒを、縦軸は
液晶セル基板１（屈折率ｎ。−１，５３）中の焦点距離
の値である。実線は、近軸条件を満足する場合の式（１
）、（２）を用いた計算結果である。これに対して点線
は、前記の様な光線追跡により求めた実効的な焦点距離
と曲率半径ｒとの関係である。従って、本光学系におい
て、球面収差を含めて最も集光効果か大きく得られる位
置が第３図中の点線の値である。この値を近軸計算結果
と比較すると曲率半径ｒの大きな場合には近軸計算結果
とほぼ一致するが、曲率半径ｒの小さな場合には近軸計
算結果の約７０％弱になっている。In FIG. 3, the horizontal axis represents the radius of curvature r of the spherical convex portion 6, and the vertical axis represents the value of the focal length in the liquid crystal cell substrate 1 (refractive index n.-1, 53). The solid line represents the equation (1
) and (2). On the other hand, the dotted line represents the relationship between the effective focal length and the radius of curvature r determined by ray tracing as described above. Therefore, in this optical system, the position where the greatest light condensing effect, including spherical aberration, can be obtained is the value indicated by the dotted line in FIG. Comparing this value with the paraxial calculation result, when the radius of curvature r is large, it almost matches the paraxial calculation result, but when the radius of curvature r is small, it is about 70% of the paraxial calculation result.
以上のシミュレーション結果より、最も集光効果か大き
く得られる実効的な焦点距離ｆｅは、およそ
０．６ｒ／（ｎｘ−１）＜ｆｅ＜ｒ／（ｎｔ−１）
（３）のように示される。従って、この値ｆｅをｔ
／ ｎｏに等しくすることにより、液晶開口位置で最大
の集光効果が得られる。From the above simulation results, the effective focal length fe that provides the greatest light focusing effect is approximately 0.6r/(nx-1)<fe<r/(nt-1)
It is shown as (3). Therefore, this value fe is
/no, the maximum light focusing effect can be obtained at the liquid crystal aperture position.
即ち、ｔ、ｎｏｒ ｒ、 ｎ工の間の数値関係をｒ
ｎ 。That is, the numerical relationship between t, nor r, and n is expressed as r
n.
とする必要がある。It is necessary to do so.
なお、本実施例では球面状凸部６を液晶セル基板１，２
のうちの一方にのみ形成したが、第４図に示すように双
方の液晶セル基板１，２の面に設けてもよい。この場合
式（４）は双方の凸部６付き液晶セル基板１．２におい
て別個に満足されなければならない。In this embodiment, the spherical convex portion 6 is connected to the liquid crystal cell substrates 1 and 2.
Although it is formed only on one of the liquid crystal cell substrates, it may be formed on both surfaces of the liquid crystal cell substrates 1 and 2 as shown in FIG. In this case, equation (4) must be satisfied separately for both liquid crystal cell substrates 1.2 with convex portions 6.
また、各式において焦点距離は球面の頂点がらの距離で
あり、解析する場合にはレンズの厚み分を考慮するべき
であるが、本用途では焦点距離４゜Ｏ〜８００μｍ稈度
に比へ、レンズの厚みは数１０μｍ以下であり事実上考
慮の必要はない。In addition, in each formula, the focal length is the distance from the apex of the spherical surface, and when analyzing it, the thickness of the lens should be taken into account, but in this application, the focal length is 4°O~800μm compared to the culmability. The thickness of the lens is several tens of micrometers or less, so there is virtually no need to consider it.
また、凸部６の材料は光硬化性又は熱硬化性等の樹脂材
の他に、ゾルゲルガラス、低融点ガラス等のガラス材料
でも良く、凸部６の表面に耐湿性等を向上させるための
コーティングや反射防止コーティングを施すと良い場合
がある。Further, the material of the convex portion 6 may be a glass material such as sol-gel glass or low melting point glass in addition to a photocurable or thermosetting resin material. It may be beneficial to apply a coating or anti-reflection coating.
なお、本発明においては、液晶セル基板１の厚さｔか０
、５ ｍｍ−１６１闘、液晶３の１画素の大きさが５
０μｍ平方〜１５０μｍ平方、液晶開口窓１ｏの寸法が
１画素の２０％〜５０％の範囲であることが前提条件と
なる。In addition, in the present invention, the thickness t of the liquid crystal cell substrate 1 is 0.
, 5 mm-161 mm, the size of one pixel of LCD 3 is 5
The prerequisite is that the size of the liquid crystal aperture window 1o is in the range of 0 μm square to 150 μm square, and 20% to 50% of one pixel.
例えば、凸部６の１個の大きさ約１００μｍ平方で曲率
半径ｒが約３５０μｍ、 ｎ ｏ＝ １．５３．
ｔ ＝ １．．１ｍｍ、 ｎ、−１，５９の光学系の
場合、約４０μｍ平方内に集光する照明光量が凸部６を
形成しない場合に比べ２倍量ト得られた。For example, the size of each convex portion 6 is approximately 100 μm square, the radius of curvature r is approximately 350 μm, and no=1.53.
t=1. ．． In the case of the 1 mm, n, -1,59 optical system, the amount of illumination light condensed within a square area of about 40 μm was twice as much as when the convex portion 6 was not formed.
（発明の効果）
以上説明したように本発明によれば、所定の条件式を満
足するように各数値を設定することによって最大の集光
効果か得られ、照明光の利用効率の向上が図れる。(Effects of the Invention) As explained above, according to the present invention, by setting each numerical value so as to satisfy a predetermined conditional expression, the maximum light gathering effect can be obtained, and the efficiency of use of illumination light can be improved. .
第１図は本発明に係る液晶光学装置の断面図、第２図は
球面状凸部による構成の屈折状態を示す模式図、第３図
は各構成部品の所定屈折率における凸部の曲率半径ｒと
液晶セル基板中の焦点距離との関係を示す計算結果の一
例、第４図は別実施例の断面図である。
１．２・・・液晶セル基板、３・・液晶、４・・・液晶
パネル、５・・・入射光線、６・・・凸部１．７・・液
晶開口窓、ｎｏ・・・液晶セル基板の屈折率、ｎ工・・
・凸部の屈折率、ｔ・・・液晶セル基板の厚さ、ｒ・・
・凸部の曲率半径。
特 許 出 願 人 日本板硝子株式会社代 理 人
弁理士 下 １） 容一部間 弁理士
大 橋 邦 産量 弁理士 小 山
有第１図 第４図
ｎ。
第２図FIG. 1 is a cross-sectional view of a liquid crystal optical device according to the present invention, FIG. 2 is a schematic diagram showing the refraction state of a configuration with a spherical convex portion, and FIG. 3 is a radius of curvature of the convex portion at a predetermined refractive index of each component. An example of calculation results showing the relationship between r and the focal length in the liquid crystal cell substrate, FIG. 4 is a cross-sectional view of another embodiment. 1.2...Liquid crystal cell substrate, 3...Liquid crystal, 4...Liquid crystal panel, 5...Incoming light beam, 6...Protrusion 1.7...Liquid crystal aperture window, no...Liquid crystal cell Refractive index of substrate, n-type...
・Refractive index of the convex portion, t...Thickness of the liquid crystal cell substrate, r...
- Radius of curvature of the convex part. Patent applicant: Nippon Sheet Glass Co., Ltd. Representative: Patent attorney (2) 1) Participant: Patent attorney
Kuni Ohashi Production Patent Attorney Koyama
Figure 1 Figure 4 n. Figure 2
Claims (4)
にレンズアレイを配設して構成する液晶光学装置におい
て、 前記透明基板の表面に前記液晶の液晶開口窓に対向する
ように球面状の凸部を多数形成して、前記レンズアレイ
とするとともに前記透明基板の厚さｔと屈折率ｎ＿０、
前記凸部の曲率半径ｒと屈折率ｎ＿１との間に ０．６≦ｔ（ｎ＿１−１）／ｒｎ＿０≦１ なる関係を有することを特徴とする液晶光学装置。(1) In a liquid crystal optical device configured by disposing a lens array on a liquid crystal panel in which a liquid crystal is sandwiched between a pair of transparent substrates, a spherical surface is provided on the surface of the transparent substrate so as to face the liquid crystal aperture window of the liquid crystal. A large number of convex portions are formed to form the lens array, and the thickness t and refractive index n_0 of the transparent substrate are
A liquid crystal optical device characterized in that the radius of curvature r of the convex portion and the refractive index n_1 have a relationship of 0.6≦t(n_1-1)/rn_0≦1.
ラス材料で製作した請求項１記載の液晶光学装置。(2) The liquid crystal optical device according to claim 1, wherein the transparent substrate is made of a glass material that does not substantially contain alkali.
に、アルカリの析出を防止するコーティングを施した請
求項１又は２記載の液晶光学装置。(3) The liquid crystal optical device according to claim 1 or 2, wherein a coating for preventing alkali precipitation is applied to a surface of the transparent substrate opposite to the surface on which the convex portion is formed.
３記載の液晶光学装置。(4) The liquid crystal optical device according to claim 3, wherein the coating is a transparent conductive film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2304441A JP2837534B2 (en) | 1990-11-09 | 1990-11-09 | Liquid crystal optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2304441A JP2837534B2 (en) | 1990-11-09 | 1990-11-09 | Liquid crystal optical device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04175726A true JPH04175726A (en) | 1992-06-23 |
| JP2837534B2 JP2837534B2 (en) | 1998-12-16 |
Family
ID=17933049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2304441A Expired - Fee Related JP2837534B2 (en) | 1990-11-09 | 1990-11-09 | Liquid crystal optical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2837534B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07191312A (en) * | 1993-11-10 | 1995-07-28 | Minnesota Mining & Mfg Co <3M> | Liquid crystal projection panel having microlens arrangement |
| WO2009128187A1 (en) * | 2008-04-16 | 2009-10-22 | シャープ株式会社 | Liquid crystal display device |
| US9986714B2 (en) | 2012-12-26 | 2018-06-05 | Nestec Sa | Low density coated animal litter compositions |
| US10477833B2 (en) | 2015-10-23 | 2019-11-19 | Société des Produits Nestlé S.A. | Low density pet litters and methods of making such pet litters |
-
1990
- 1990-11-09 JP JP2304441A patent/JP2837534B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07191312A (en) * | 1993-11-10 | 1995-07-28 | Minnesota Mining & Mfg Co <3M> | Liquid crystal projection panel having microlens arrangement |
| WO2009128187A1 (en) * | 2008-04-16 | 2009-10-22 | シャープ株式会社 | Liquid crystal display device |
| US8279377B2 (en) | 2008-04-16 | 2012-10-02 | Sharp Kabushiki Kaisha | Liquid crystal display device |
| US9986714B2 (en) | 2012-12-26 | 2018-06-05 | Nestec Sa | Low density coated animal litter compositions |
| US10477833B2 (en) | 2015-10-23 | 2019-11-19 | Société des Produits Nestlé S.A. | Low density pet litters and methods of making such pet litters |
| US10881077B2 (en) | 2015-10-23 | 2021-01-05 | Société des Produits Nestlé S.A. | Low density pet litters and methods of making such pet litters |
| US11457606B2 (en) | 2015-10-23 | 2022-10-04 | Société des Produits Nestlé S.A. | Low density pet litters and methods of making and using such pet litters |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2837534B2 (en) | 1998-12-16 |
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