JP2000019490A - Reflection type polymer-dispersed liquid crystal display device - Google Patents
Reflection type polymer-dispersed liquid crystal display deviceInfo
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- JP2000019490A JP2000019490A JP10181995A JP18199598A JP2000019490A JP 2000019490 A JP2000019490 A JP 2000019490A JP 10181995 A JP10181995 A JP 10181995A JP 18199598 A JP18199598 A JP 18199598A JP 2000019490 A JP2000019490 A JP 2000019490A
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- liquid crystal
- crystal display
- display device
- polymer
- light
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、反射型高分子分散
型液晶表示装置に関し、特に、正反射方向から見ても見
やすい反射型高分子分散型液晶表示装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective polymer-dispersed liquid crystal display, and more particularly to a reflective polymer-dispersed liquid crystal display which is easy to see even in a regular reflection direction.
【０００２】[0002]
【従来の技術】従来から高分子分散型液晶表示装置が注
目されている。図４を参照にして高分子分散型液晶の原
理を説明する。図４（ａ）は高分子分散型液晶に電場を
印加しない場合、図４（ｂ）は印加した場合を示し、高
分子マトリックス２中に液晶１が分散されており、高分
子マトリックス２の屈折率が液晶１の常光屈折率に略一
致するように設定されている。図４（ａ）のスイッチが
開いて電源３からの電圧が透明電極４、４間に印加され
ない状態では、液晶１がランダムな状態にあるため、空
間的な屈折率の差異が生じ、入射光５は前方への散乱光
（前方散乱光）６と後方への散乱光（後方散乱光）７と
に散乱される。図４（ｂ）の透明電極４、４間に電圧が
印加された状態では、液晶１が電界方向に配列し、その
結果液晶１と高分子マトリックス２の屈折率差が減少
し、入射光５は散乱を受けずに直進光８として透過する
ので、透明状態になる。2. Description of the Related Art Conventionally, polymer-dispersed liquid crystal display devices have been receiving attention. The principle of the polymer dispersed liquid crystal will be described with reference to FIG. 4A shows the case where no electric field is applied to the polymer dispersed liquid crystal, and FIG. 4B shows the case where the electric field is applied. The liquid crystal 1 is dispersed in the polymer matrix 2 and the refraction of the polymer matrix 2 is shown. The index is set so as to substantially match the ordinary light refractive index of the liquid crystal 1. In the state where the switch from FIG. 4A is opened and the voltage from the power supply 3 is not applied between the transparent electrodes 4, the liquid crystal 1 is in a random state, so that a spatial difference in the refractive index occurs and the incident light is changed. 5 is scattered by forward scattered light (forward scattered light) 6 and backward scattered light (backward scattered light) 7. When a voltage is applied between the transparent electrodes 4 and 4 in FIG. 4B, the liquid crystal 1 is arranged in the direction of the electric field, and as a result, the difference in the refractive index between the liquid crystal 1 and the polymer matrix 2 is reduced, and the incident light 5 Is transmitted as straight light 8 without being scattered, and thus becomes transparent.
【０００３】このような高分子分散型液晶を用いた液晶
表示装置（以下、ＰＤ液晶表示装置と呼ぶ。）が提案さ
れている。ＰＤ液晶表示装置は、その原理から偏光板を
用いる必要がなく、電場を加えるか加えないかに応じ
て、液晶が透明状態、散乱状態に変化するため、非常に
明るく、例えば裏面に鏡面部材を配することにより、略
ペーパーホワイト表示が可能である。A liquid crystal display device using such a polymer dispersed liquid crystal (hereinafter referred to as a PD liquid crystal display device) has been proposed. The PD liquid crystal display device does not need to use a polarizing plate due to its principle, and the liquid crystal changes to a transparent state or a scattering state depending on whether an electric field is applied or not. Therefore, the PD liquid crystal display is very bright. By doing so, substantially paper white display is possible.
【０００４】図５に従来のモノクロの反射型ＰＤ液晶表
示装置の概略の構成を示す。ただし、画素電極、対向電
極は図示を省く。上記のような高分子分散型液晶（以
下、ＰＤ液晶と呼ぶ。）１０は透明基板１１と基板１２
の間に挟持され、ＰＤ液晶１０の観察側と反対側の基板
１２表面には、ミラー１３が配置されている。そして、
この反射型ＰＤ液晶表示装置は代表的に３つの画素Ｘ，
Ｙ，Ｚからなるものとする。いま、画素Ｘ，Ｚは電圧が
印加されておらず、画素Ｙには電圧が印加されていると
すると、画素Ｘ，Ｚは散乱状態、画素Ｙは透明状態にあ
るので、適当な入射角で外光（周囲の環境光）１４がこ
の反射型ＰＤ液晶表示装置に入射すると、画素Ｘ，Ｚは
散乱状態にあるので、後方散乱光はそのまま、前方散乱
光はミラー１３で一旦反射されてこの反射型ＰＤ液晶表
示装置の正面に位置する観察者の目に入り略白く見え
る。画素Ｙは透明状態であるので、外光１４はミラー１
３で正反射されて反射型ＰＤ液晶表示装置の正面方向に
は進まないので、略黒に見える。FIG. 5 shows a schematic configuration of a conventional monochrome reflective PD liquid crystal display device. However, the pixel electrode and the counter electrode are not shown. The polymer-dispersed liquid crystal (hereinafter referred to as PD liquid crystal) 10 as described above includes a transparent substrate 11 and a substrate 12.
A mirror 13 is disposed on the surface of the substrate 12 opposite to the observation side of the PD liquid crystal 10 and sandwiched between them. And
This reflective PD liquid crystal display device typically has three pixels X,
It is assumed to be composed of Y and Z. Now, assuming that no voltage is applied to the pixels X and Z and a voltage is applied to the pixel Y, the pixels X and Z are in the scattering state and the pixel Y is in the transparent state. When external light (surrounding ambient light) 14 is incident on the reflective PD liquid crystal display device, the pixels X and Z are in a scattering state. It looks almost white in the eyes of an observer located in front of the reflective PD liquid crystal display device. Since the pixel Y is in a transparent state, the external light 14
Since the light is specularly reflected at 3 and does not travel in the front direction of the reflective PD liquid crystal display device, it looks almost black.
【０００５】図６に従来のカラーの反射型ＰＤ液晶表示
装置の概略の構成を示す。この場合も、画素電極、対向
電極は図示を省く。この構成は、基本的に図５のＰＤ液
晶１０の観察側の透明基板１１表面に、Ｒ（赤色）透過
Ｒフィルター１５Ｒ、Ｇ（緑色）透過Ｇフィルター１５
Ｇ、Ｂ（青色）透過Ｂフィルター１５Ｂのアレーからな
るカラーフィルター１５を配置したもので、この場合も
代表的に３つの画素Ｒ，Ｇ，Ｂからなるものとする。い
ま、画素Ｒ，Ｂは電圧が印加されておらず、画素Ｇには
電圧が印加されているとすると、画素Ｒ，Ｂは散乱状
態、画素Ｇは透明状態にあるので、適当な入射角で外光
（周囲の環境光）１４がこのカラー反射型ＰＤ液晶表示
装置に入射すると、画素Ｒ，Ｂは散乱状態にあるため、
それぞれＲ透過Ｒフィルター１５Ｒ、Ｂ透過Ｂフィルタ
ー１５Ｂを透過したＲ光、Ｂ光の後方散乱光はそのま
ま、前方散乱光はミラー１３で一旦反射されてこの反射
型ＰＤ液晶表示装置の正面に位置する観察者の目に入
り、それぞれ赤色、青色に見える。画素Ｇは透明状態で
あるので、外光１４はミラー１３で正反射されてこの反
射型ＰＤ液晶表示装置の正面方向には進まないので、略
黒に見える。FIG. 6 shows a schematic configuration of a conventional color reflective PD liquid crystal display device. Also in this case, the pixel electrode and the counter electrode are not shown. This configuration basically includes an R (red) transmission R filter 15R and a G (green) transmission G filter 15 on the surface of the transparent substrate 11 on the observation side of the PD liquid crystal 10 in FIG.
A color filter 15 composed of an array of G, B (blue) transmission B filters 15B is arranged, and also in this case, it is assumed that the color filter 15 is typically composed of three pixels R, G, B. Now, assuming that no voltage is applied to the pixels R and B and a voltage is applied to the pixel G, the pixels R and B are in the scattering state and the pixel G is in the transparent state. When external light (surrounding ambient light) 14 is incident on the color reflective PD liquid crystal display device, the pixels R and B are in a scattering state.
The back scattered light of the R light and B light transmitted through the R transmission R filter 15R and the B transmission B filter 15B respectively remains unchanged, and the forward scattered light is once reflected by the mirror 13 and is located in front of the reflective PD liquid crystal display device. It enters the observer's eyes and looks red and blue, respectively. Since the pixel G is in a transparent state, the external light 14 is specularly reflected by the mirror 13 and does not proceed in the front direction of the reflective PD liquid crystal display device, so that it looks almost black.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の反射型ＰＤ液晶表示装置の場合に、ＰＤ液晶
の裏面にミラー配する場合、透明状態にある部分（画
素）の照明光（外光）の正反射方向ではその正反射光が
目に入り、黒く見えずむしろ白黒反転して著しく視認性
を低下させてしまう。However, in the case of such a conventional reflection type PD liquid crystal display device, when a mirror is arranged on the back surface of the PD liquid crystal, illumination light (external light) of a portion (pixel) in a transparent state is provided. In the specular reflection direction of (1), the specular reflection light enters the eyes, and does not look black, but rather reverses black and white, significantly lowering the visibility.
【０００７】そこで、裏面に黒色部材を配してその透明
状態にある部分を黒表示部にすることが考えられるが、
散乱状態となっている部分はペーパーホワイトにならな
い。これは、前方散乱光がこの黒色部材で吸収されて観
察側へ戻らないため、灰色になるからである。In view of this, it is conceivable to arrange a black member on the back surface and make the transparent portion a black display portion.
The portion in the scattering state does not become paper white. This is because the forward scattered light is absorbed by this black member and does not return to the observation side, so that it becomes gray.
【０００８】本発明は従来技術のこのような問題点に鑑
みてなされたものであり、その目的は、明るく、広視野
で、視認性の良い反射型高分子分散型液晶表示装置を提
供することである。The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a reflective polymer-dispersed liquid crystal display device that is bright, has a wide field of view, and has good visibility. It is.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成する本発
明の反射型高分子分散型液晶表示装置は、高分子分散型
液晶層の観察側とは反対側に再帰反射層を設けたことを
特徴とするものである。According to a first aspect of the present invention, there is provided a reflective polymer-dispersed liquid crystal display device having a retroreflective layer provided on a side opposite to an observation side of a polymer-dispersed liquid crystal layer. It is a feature.
【００１０】この場合に、再帰反射層として、微細な透
明ビーズを多数含有する塗料層あるいは微細な透明ビー
ズを多数含有するフィルム、コーナーキューブミラーあ
るいはコーナーキューブプリズムを並列させた構造のも
の等を用いることができる。In this case, as the retroreflective layer, a paint layer containing a large number of fine transparent beads, a film containing a large number of fine transparent beads, a corner cube mirror or a structure in which corner cube prisms are arranged in parallel are used. be able to.
【００１１】また、高分子分散型液晶層の観察側に、異
なる複数の色フィルターを周期的に配列してなるカラー
フィルターを配置してカラー反射型高分子分散型液晶表
示装置とすることができる。A color reflection type polymer dispersion type liquid crystal display device can be obtained by disposing a color filter comprising a plurality of different color filters arranged periodically on the observation side of the polymer dispersion type liquid crystal layer. .
【００１２】本発明においては、高分子分散型液晶層の
観察側とは反対側に再帰反射層を設けたので、透明状態
にある画素の照明光が正反射方向に反射して光が目に入
り、黒く見えずむしろ白黒反転して著しく視認性を低下
させてしまう問題が防止できると共に、明るく、コント
ラストが高く、色度が高く、広視野で視認性の良い反射
型高分子分散型液晶表示装置を可能にする。In the present invention, since the retroreflective layer is provided on the side opposite to the observation side of the polymer-dispersed liquid crystal layer, the illumination light of the pixel in the transparent state is reflected in the regular reflection direction and the light is reflected on the eye. A reflective polymer-dispersed liquid crystal display that is bright, has high contrast, has high chromaticity, and has good visibility in a wide field of view. Enable the device.
【００１３】[0013]
【発明の実施の形態】以下、本発明の反射型高分子分散
型液晶表示装置（以下、反射型ＰＤ液晶表示装置と呼
ぶ。）を実施例に基づいて説明する。図１は、本発明に
基づくモノクロの反射型ＰＤ液晶表示装置の実施例の概
略の構成を示す図である。ただし、画素電極、対向電極
は図示を省く。前記したような高分子分散型液晶（以
下、ＰＤ液晶と呼ぶ。）１０は透明基板１１と基板１２
の間に挟持され、ＰＤ液晶１０の観察側と反対側の基板
１２表面には、従来のミラーに代わって本発明において
は再帰反射層２０が配置されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a reflective polymer dispersed liquid crystal display device (hereinafter referred to as a reflective PD liquid crystal display device) of the present invention will be described with reference to embodiments. FIG. 1 is a diagram showing a schematic configuration of an embodiment of a monochrome reflective PD liquid crystal display device according to the present invention. However, the pixel electrode and the counter electrode are not shown. The polymer-dispersed liquid crystal (hereinafter referred to as PD liquid crystal) 10 as described above includes a transparent substrate 11 and a substrate 12.
In the present invention, a retroreflective layer 20 is disposed on the surface of the substrate 12 opposite to the observation side of the PD liquid crystal 10 in place of the conventional mirror.
【００１４】ここで、再帰反射層２０とは、入射光をそ
の方向と略反対の方向へ反射させる（再帰反射させる）
特性を有するもので、この特性は入射光の方向によらに
ものである。再帰反射をするものに、微細な透明ビーズ
を多数含有する塗料、微細な透明ビーズを多数含有する
フィルムがある。微細な透明ビーズ２１は、図３（ａ）
に示すように、入射光２２を内部で反射させ、入射光２
２と略反対方向に進む光２３として反射させる再帰反射
特性を有するものであり、このような微細な透明ビーズ
を多数含有する塗料又はフィルム（例えば、３Ｍ社製
ＳｃｏｔｃｈＬｉｔｅ）が再帰反射層２０として用いら
れる。また、図３（ｂ）に示すようなコーナーキューブ
ミラー２４を並列させたものも再帰反射をする。コーナ
ーキューブミラー２４は３つの反射面２５、２６、２７
からなり、それらの反射面は相互に略９０°の角度をな
すもので、微細な透明ビーズ２１と同様に、入射光２２
と略反対方向に進む光２３として反射させる再帰反射特
性を有するものである。このようなコーナーキューブミ
ラー２４を並列させたものを上記の再帰反射層２０とし
て用いることができる。なお、反射面２５、２６、２７
の間の透明媒質で埋めたコーナーキューブプリズムも同
様の再帰反射特性を有するので、このコーナーキューブ
プリズムを並列させたものも再帰反射層２０として用い
ることができる。The retroreflective layer 20 reflects incident light in a direction substantially opposite to that direction (retroreflects).
Characteristics, which are dependent on the direction of the incident light. As a material that performs retroreflection, there are a paint containing many fine transparent beads and a film containing many fine transparent beads. The fine transparent beads 21 are shown in FIG.
As shown in the figure, the incident light 22 is internally reflected, and the incident light 2
2 has a retroreflective property of reflecting as light 23 traveling in a direction substantially opposite to that of the paint 2 or a paint (for example, manufactured by 3M Company) containing a large number of such fine transparent beads.
ScotchLite) is used as the retroreflective layer 20. In addition, a parallel arrangement of corner cube mirrors 24 as shown in FIG. 3B also performs retroreflection. The corner cube mirror 24 has three reflecting surfaces 25, 26, 27
These reflecting surfaces form an angle of about 90 ° with each other, and like the fine transparent beads 21, the incident light 22.
It has a retroreflective characteristic of reflecting as light 23 traveling in a direction substantially opposite to the above. A parallel arrangement of such corner cube mirrors 24 can be used as the retroreflective layer 20 described above. The reflection surfaces 25, 26, 27
Since the corner cube prism filled with a transparent medium between them has the same retroreflection characteristics, a parallel arrangement of the corner cube prisms can also be used as the retroreflection layer 20.
【００１５】図１に戻り、この反射型ＰＤ液晶表示装置
は代表的に３つの画素Ｘ，Ｙ，Ｚからなるものとする。
いま、画素Ｘ，Ｚは電圧が印加されておらず、画素Ｙに
は電圧が印加されているとすると、画素Ｘ，Ｚは散乱状
態、画素Ｙは透明状態にあるので、適当な入射角で外光
（周囲の環境光）１４がこの反射型ＰＤ液晶表示装置に
入射すると、画素Ｘ，Ｚは散乱状態にあるので、後方散
乱光はそのまま、前方散乱光は再帰反射層２０で一旦再
帰反射されてこの反射型ＰＤ液晶表示装置の前方に位置
する観察者の目に入り略白く見える。画素Ｙは透明状態
であるので、外光１４は再帰反射層２０で外光１４の入
射方向と反対方向にのみ再帰反射光１６として反射さ
れ、外光１４の入射方向以外の方向には反射されないの
で、略黒に見える。この場合、外光１４は正反射方向Ａ
へも反射されないので、従来のように透明状態にある画
素Ｙからその正反射方向Ａに位置する観察者の目に反射
光が入り、その画素Ｙが黒く見えず白黒反転してしまう
現象は発生しない。したがって、どの方向から観察して
も十分にコントラストが高く、明るく、白黒反転のな
い、広視野で視認性の良いモノクロの反射型高分子分散
型液晶表示装置が実現できる。Returning to FIG. 1, it is assumed that this reflective PD liquid crystal display device typically includes three pixels X, Y, and Z.
Now, assuming that no voltage is applied to the pixels X and Z and a voltage is applied to the pixel Y, the pixels X and Z are in the scattering state and the pixel Y is in the transparent state. When external light (ambient ambient light) 14 enters this reflective PD liquid crystal display device, the pixels X and Z are in a scattering state, so that the backward scattered light remains as it is and the forward scattered light is once retroreflected by the retroreflective layer 20. Then, the light enters the eyes of an observer located in front of the reflective PD liquid crystal display device and looks almost white. Since the pixel Y is in a transparent state, the external light 14 is reflected by the retroreflective layer 20 as the retroreflective light 16 only in the direction opposite to the incident direction of the external light 14, and is not reflected in directions other than the incident direction of the external light 14. So it looks almost black. In this case, the external light 14 has a regular reflection direction A
As a result, the reflected light enters the observer's eyes located in the regular reflection direction A from the pixel Y in the transparent state, and the pixel Y does not look black and is inverted in black and white as in the related art. do not do. Therefore, it is possible to realize a monochrome reflective polymer dispersed liquid crystal display device having a sufficiently high contrast, a high brightness, no black-and-white inversion, and a wide field of view and good visibility even when viewed from any direction.
【００１６】この場合、外光１４の入射方向と反対の方
向へ透明画素Ｙからの反射光１６が進むが、反射型液晶
表示装置の観察者は、外光１４の入射方向からは観察す
ることはほとんどないので、この反射光１６は問題にな
らない。In this case, the reflected light 16 from the transparent pixel Y travels in a direction opposite to the incident direction of the external light 14, but the observer of the reflective liquid crystal display device must observe from the incident direction of the external light 14. The reflected light 16 is not a problem because there is almost no reflection light.
【００１７】図２は、本発明に基づくカラーの反射型Ｐ
Ｄ液晶表示装置の概略の構成を示す図である。この場合
も、画素電極、対向電極は図示を省く。この構成は、基
本的に図１のＰＤ液晶１０の観察側の透明基板１１表面
に、Ｒ（赤色）透過Ｒフィルター１５Ｒ、Ｇ（緑色）透
過Ｇフィルター１５Ｇ、Ｂ（青色）透過Ｂフィルター１
５Ｂのアレーからなるカラーフィルター１５を配置した
もので、この場合も代表的に３つの画素Ｒ，Ｇ，Ｂから
なるものとする。いま、画素Ｒ，Ｂは電圧が印加されて
おらず、画素Ｇには電圧が印加されているとすると、画
素Ｒ，Ｂは散乱状態、画素Ｇは透明状態にあるので、適
当な入射角で外光（周囲の環境光）１４がこのカラー反
射型ＰＤ液晶表示装置に入射すると、画素Ｒ，Ｂは散乱
状態にあるため、それぞれＲ透過Ｒフィルター１５Ｒ、
Ｂ透過Ｂフィルター１５Ｂを透過したＲ光、Ｂ光の後方
散乱光はそのまま、前方散乱光は再帰反射層２０で一旦
再帰反射されてこの反射型ＰＤ液晶表示装置の前方に位
置する観察者の目に入り、それぞれ赤色、青色に見え
る。画素Ｇは透明状態であるので、外光１４は再帰反射
層２０で外光１４の入射方向と反対方向にのみ再帰反射
光１６として反射され、外光１４の入射方向以外の方向
には反射されないので、略黒に見える。FIG. 2 shows a color reflective P according to the present invention.
It is a figure which shows the schematic structure of a D liquid crystal display device. Also in this case, the pixel electrode and the counter electrode are not shown. This configuration basically includes an R (red) transmission R filter 15R, a G (green) transmission G filter 15G, and a B (blue) transmission B filter 1 on the surface of the transparent substrate 11 on the observation side of the PD liquid crystal 10 in FIG.
A color filter 15 composed of a 5B array is arranged. In this case, it is also assumed that the color filter 15 typically includes three pixels R, G, and B. Now, assuming that no voltage is applied to the pixels R and B and a voltage is applied to the pixel G, the pixels R and B are in the scattering state and the pixel G is in the transparent state. When external light (ambient ambient light) 14 enters this color reflection type PD liquid crystal display device, the pixels R and B are in a scattering state, and therefore, the R transmission R filter 15R,
The back scattered light of the R light and the B light transmitted through the B transmission B filter 15B remains unchanged, while the forward scattered light is once retroreflected by the retroreflection layer 20, and the eyes of an observer located in front of the reflective PD liquid crystal display device. And looks red and blue respectively. Since the pixel G is in a transparent state, the external light 14 is reflected by the retroreflective layer 20 only as a retroreflective light 16 in a direction opposite to the incident direction of the external light 14 and is not reflected in a direction other than the incident direction of the external light 14. So it looks almost black.
【００１８】このカラーのの反射型ＰＤ液晶表示装置の
場合も、外光１４は正反射方向Ａへも反射されないの
で、従来のように透明状態にある画素Ｙからその正反射
方向Ａに位置する観察者の目に反射光が入り、その画素
Ｙが黒く見えず白黒反転してしまう現象は発生しない。
したがって、どの方向から観察しても十分にコントラス
トが高く、明るく、色度が高く、白黒反転のない、広視
野で視認性の良いカラーの反射型高分子分散型液晶表示
装置が実現できる。Also in the case of this color reflective PD liquid crystal display device, since the external light 14 is not reflected in the regular reflection direction A, it is located in the regular reflection direction A from the pixel Y in a transparent state as in the prior art. The phenomenon that the reflected light enters the observer's eyes and the pixel Y does not look black and is inverted between black and white does not occur.
Therefore, it is possible to realize a color reflective polymer dispersed liquid crystal display device which has a sufficiently high contrast, is bright, has high chromaticity, has no black-and-white reversal, has a wide field of view, and has good visibility even when viewed from any direction.
【００１９】以上、本発明の反射型高分子分散型液晶表
示装置を実施例に基づいて説明してきたが、本発明はこ
れら実施例に限定されず種々の変形が可能である。例え
ば、図１、図２の構成において、基板１２を透明基板と
し、再帰反射層２０をその観察側と反対側に配置するよ
うにしてもよい。Although the reflection type polymer dispersed liquid crystal display device of the present invention has been described based on the embodiments, the present invention is not limited to these embodiments, and various modifications can be made. For example, in the configuration of FIGS. 1 and 2, the substrate 12 may be a transparent substrate, and the retroreflective layer 20 may be disposed on the side opposite to the observation side.
【００２０】[0020]
【発明の効果】以上の説明から明らかなように、本発明
の反射型高分子分散型液晶表示装置によると、高分子分
散型液晶層の観察側とは反対側に再帰反射層を設けたの
で、透明状態にある画素の照明光が正反射方向に反射し
て光が目に入り、黒く見えずむしろ白黒反転して著しく
視認性を低下させてしまう問題が防止できると共に、明
るく、コントラストが高く、色度が高く、広視野で視認
性の良い反射型高分子分散型液晶表示装置を可能にす
る。As is apparent from the above description, according to the reflective polymer dispersed liquid crystal display device of the present invention, the retroreflective layer is provided on the polymer dispersed liquid crystal layer on the side opposite to the observation side. It is possible to prevent the problem that the illumination light of the pixel in the transparent state is reflected in the specular reflection direction and the light enters the eyes, and does not look black, but rather inverts black and white and significantly lowers the visibility, and is bright and has high contrast. And a reflective polymer dispersed liquid crystal display device having high chromaticity and good visibility in a wide field of view.
【図１】本発明に基づくモノクロ反射型高分子分散型液
晶表示装置の実施例の概略の構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of an embodiment of a monochrome reflective polymer dispersed liquid crystal display device according to the present invention.
【図２】本発明に基づくカラー反射型高分子分散型液晶
表示装置の概略の構成を示す。FIG. 2 shows a schematic configuration of a color reflective polymer dispersed liquid crystal display device according to the present invention.
【図３】本発明で用いる再帰反射層の代表的構成を説明
するための図である。FIG. 3 is a diagram illustrating a typical configuration of a retroreflective layer used in the present invention.
【図４】高分子分散型液晶の原理を説明するための図で
ある。FIG. 4 is a diagram for explaining the principle of a polymer-dispersed liquid crystal.
【図５】従来のモノクロ反射型高分子分散型液晶表示装
置の概略の構成を示す図である。FIG. 5 is a diagram showing a schematic configuration of a conventional monochrome reflective polymer dispersed liquid crystal display device.
【図６】従来のカラー反射型高分子分散型液晶表示装置
の概略の構成を示す図である。FIG. 6 is a diagram showing a schematic configuration of a conventional color reflection type polymer dispersion type liquid crystal display device.
１…液晶 ２…高分子マトリックス ３…電源 ４…透明電極 ５…入射光 ６…前方散乱光 ７…後方散乱光 ８…直進光 １０…ＰＤ液晶（高分子分散型液晶） １１…観察側透明基板 １２…基板 １４…外光（周囲の環境光） １５…カラーフィルター １５Ｒ…Ｒ透過Ｒフィルター １５Ｇ…Ｇ透過Ｇフィルター １５Ｂ…Ｂ透過Ｒフィルター １６…再帰反射光 ２０…再帰反射層 ２１…透明ビーズ ２２…入射光 ２３…再帰反射光 ２４…コーナーキューブミラー ２５、２６、２７…反射面 Ａ…外光の正反射方向 Ｒ，Ｇ，Ｂ，Ｘ，Ｙ，Ｚ…画素 DESCRIPTION OF SYMBOLS 1 ... Liquid crystal 2 ... Polymer matrix 3 ... Power supply 4 ... Transparent electrode 5 ... Incident light 6 ... Forward scattered light 7 ... Back scattered light 8 ... Straight light 10 ... PD liquid crystal (polymer dispersed liquid crystal) 11 ... Observation side transparent substrate DESCRIPTION OF SYMBOLS 12 ... Substrate 14 ... External light (surrounding ambient light) 15 ... Color filter 15R ... R transmission R filter 15G ... G transmission G filter 15B ... B transmission R filter 16 ... Retroreflection light 20 ... Retroreflection layer 21 ... Transparent beads 22 ... incident light 23 ... retroreflected light 24 ... corner cube mirror 25,26,27 ... reflective surface A ... specular reflection direction of external light R, G, B, X, Y, Z ... pixel
Claims (4)
に再帰反射層を設けたことを特徴とする反射型高分子分
散型液晶表示装置。1. A reflective polymer-dispersed liquid crystal display device comprising a retroreflective layer provided on the opposite side of the polymer-dispersed liquid crystal layer from the observation side.
微細な透明ビーズを多数含有する塗料層あるいは微細な
透明ビーズを多数含有するフィルムからなることを特徴
とする反射型高分子分散型液晶表示装置。2. The method according to claim 1, wherein the retroreflective layer comprises:
A reflective polymer-dispersed liquid crystal display device comprising a paint layer containing a large number of fine transparent beads or a film containing a large number of fine transparent beads.
コーナーキューブミラーあるいはコーナーキューブプリ
ズムを並列させた構造のものであることを特徴とする反
射型高分子分散型液晶表示装置。3. The method according to claim 1, wherein the retroreflective layer comprises:
A reflective polymer dispersed liquid crystal display device having a structure in which a corner cube mirror or a corner cube prism is arranged in parallel.
前記高分子分散型液晶層の観察側に、異なる複数の色フ
ィルターを周期的に配列してなるカラーフィルターが配
置されていることを特徴とする反射型高分子分散型液晶
表示装置。4. In any one of claims 1 to 3,
A reflective polymer-dispersed liquid crystal display device, wherein a color filter in which a plurality of different color filters are periodically arranged is arranged on the observation side of the polymer-dispersed liquid crystal layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10181995A JP2000019490A (en) | 1998-06-29 | 1998-06-29 | Reflection type polymer-dispersed liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10181995A JP2000019490A (en) | 1998-06-29 | 1998-06-29 | Reflection type polymer-dispersed liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000019490A true JP2000019490A (en) | 2000-01-21 |
| JP2000019490A5 JP2000019490A5 (en) | 2005-10-13 |
Family
ID=16110492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10181995A Pending JP2000019490A (en) | 1998-06-29 | 1998-06-29 | Reflection type polymer-dispersed liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000019490A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002107519A (en) * | 2000-03-31 | 2002-04-10 | Sharp Corp | Reflection type display unit, retroreflector |
| JP2002198184A (en) * | 2000-10-18 | 2002-07-12 | Sharp Corp | Light-emitting display element |
| US6788366B2 (en) | 2001-12-26 | 2004-09-07 | Sharp Kabushiki Kaisha | Display device including corner cube array |
| US6819507B2 (en) | 2001-02-20 | 2004-11-16 | Sharp Kabushiki Kaisha | Optical element like corner cube retroreflector and reflective display device including such an optical element |
| US7045278B2 (en) | 2002-06-27 | 2006-05-16 | Sharp Kabushiki Kaisha | Corner cube array and method of making the corner cube array |
| US7098137B2 (en) | 2001-12-13 | 2006-08-29 | Sharp Kabushiki Kaisha | Micro corner cube array, method of making the micro corner cube array, and display device |
| US7098976B2 (en) | 2001-06-15 | 2006-08-29 | Sharp Kabushiki Kaisha | Micro corner cube array, method of making the micro corner cube array and reflective type display device |
| US7216992B2 (en) | 2005-02-01 | 2007-05-15 | Sharp Kabushiki Kaisha | Reflective display device |
| US7220008B2 (en) | 2005-02-17 | 2007-05-22 | Sharp Kabushiki Kaisha | Reflective display device |
| JP2007171647A (en) * | 2005-12-22 | 2007-07-05 | Fujifilm Corp | Filter with black matrix and liquid crystal display device |
| US7522243B2 (en) | 2002-03-01 | 2009-04-21 | Sharp Kabushiki Kaisha | Display device and method for fabricating the display device |
| US7952661B2 (en) | 2006-08-31 | 2011-05-31 | Sharp Kabushiki Kaisha | Reflection type display device and its manufacturing method |
| US8040473B2 (en) | 2005-12-21 | 2011-10-18 | Fujifilm Corporation | Multilayer black-matrix-equipped filter and liquid crystal display |
| JP2012026157A (en) * | 2010-07-23 | 2012-02-09 | Taisei Corp | Reflector |
-
1998
- 1998-06-29 JP JP10181995A patent/JP2000019490A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002107519A (en) * | 2000-03-31 | 2002-04-10 | Sharp Corp | Reflection type display unit, retroreflector |
| JP2002198184A (en) * | 2000-10-18 | 2002-07-12 | Sharp Corp | Light-emitting display element |
| US6819507B2 (en) | 2001-02-20 | 2004-11-16 | Sharp Kabushiki Kaisha | Optical element like corner cube retroreflector and reflective display device including such an optical element |
| US7098976B2 (en) | 2001-06-15 | 2006-08-29 | Sharp Kabushiki Kaisha | Micro corner cube array, method of making the micro corner cube array and reflective type display device |
| US7518676B2 (en) | 2001-06-15 | 2009-04-14 | Sharp Kabushiki Kaisha | Micro corner cube array, method of making the micro corner cube array and reflective type display device |
| US7360907B2 (en) | 2001-12-13 | 2008-04-22 | Sharp Kabushiki Kaisha | Micro corner cube array, method of making the micro corner cube array, and display device |
| US7098137B2 (en) | 2001-12-13 | 2006-08-29 | Sharp Kabushiki Kaisha | Micro corner cube array, method of making the micro corner cube array, and display device |
| US6788366B2 (en) | 2001-12-26 | 2004-09-07 | Sharp Kabushiki Kaisha | Display device including corner cube array |
| US7522243B2 (en) | 2002-03-01 | 2009-04-21 | Sharp Kabushiki Kaisha | Display device and method for fabricating the display device |
| US7045278B2 (en) | 2002-06-27 | 2006-05-16 | Sharp Kabushiki Kaisha | Corner cube array and method of making the corner cube array |
| US7216992B2 (en) | 2005-02-01 | 2007-05-15 | Sharp Kabushiki Kaisha | Reflective display device |
| US7220008B2 (en) | 2005-02-17 | 2007-05-22 | Sharp Kabushiki Kaisha | Reflective display device |
| US8040473B2 (en) | 2005-12-21 | 2011-10-18 | Fujifilm Corporation | Multilayer black-matrix-equipped filter and liquid crystal display |
| JP2007171647A (en) * | 2005-12-22 | 2007-07-05 | Fujifilm Corp | Filter with black matrix and liquid crystal display device |
| US7952661B2 (en) | 2006-08-31 | 2011-05-31 | Sharp Kabushiki Kaisha | Reflection type display device and its manufacturing method |
| JP2012026157A (en) * | 2010-07-23 | 2012-02-09 | Taisei Corp | Reflector |
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