JPH03186816A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPH03186816A JPH03186816A JP1327610A JP32761089A JPH03186816A JP H03186816 A JPH03186816 A JP H03186816A JP 1327610 A JP1327610 A JP 1327610A JP 32761089 A JP32761089 A JP 32761089A JP H03186816 A JPH03186816 A JP H03186816A
- Authority
- JP
- Japan
- Prior art keywords
- pdlc
- liquid crystal
- light absorber
- display element
- color
- 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
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 22
- 239000006096 absorbing agent Substances 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 229920006254 polymer film Polymers 0.000 claims 1
- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 abstract description 28
- 239000003086 colorant Substances 0.000 abstract description 4
- 239000000975 dye Substances 0.000 description 5
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 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］ 本発明は液晶表示素子に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a liquid crystal display element.
［従来の技術］
高分子・液晶複合膜（以下ＰＤＬＣと呼ぶ）は、第１図
に示したように高分子のスポンジ状三次元網目構造１５
の中に低分子液晶１４を保持した特殊な膜である。ＰＤ
ＬＣは、電圧印加にともなって光散乱状態から光透過状
態へと変化するので、この性質を利用して、既に調光ガ
ラスとして実用化しており、一方ではデイスプレィとし
ての応用も検討されている。[Prior Art] A polymer/liquid crystal composite film (hereinafter referred to as PDLC) has a sponge-like three-dimensional network structure 15 of polymers, as shown in FIG.
It is a special film that holds a low-molecular liquid crystal 14 inside. P.D.
LC changes from a light-scattering state to a light-transmitting state as voltage is applied, and this property has already been put to practical use as light control glass, while applications as displays are also being considered.
特にカラーデイスプレィとして応用する場合には、液晶
に黒色の２色性色素を混ぜてコントラストを高めた上で
、第２図のようにＰＤＬＣの後方にカラーフィルタ４を
置く構成が提案されている。In particular, when applied as a color display, a configuration has been proposed in which a black dichroic dye is mixed into the liquid crystal to increase contrast, and a color filter 4 is placed behind the PDLC as shown in Figure 2. .
このようにすると、電圧無印加時には、ＰＤＬＣの散乱
効果と２色性色素の光吸収効果で黒っぽくなり、一方電
圧印加時には、ＰＤＬＣ１２色性色素共に光透過状態に
なって、後方に置かれたカラーフィルタの色が見えるた
め、カラーの表示ができるようになる。In this way, when no voltage is applied, it becomes blackish due to the scattering effect of the PDLC and the light absorption effect of the dichroic dye, while when a voltage is applied, both the PDLC and the dichroic dye become light transmitting, and the color placed behind Since you can see the color of the filter, you can display colors.
［発明が解決しようとする課題］
しかしながら、このような構成のカラーデイスプレィに
はコントラストが低いという課題があった。これは主と
して２色性色素の２色性の限界によって、暗状態が充分
に暗くならないことに原因がある。[Problems to be Solved by the Invention] However, color displays with such a configuration have a problem of low contrast. This is mainly due to the fact that the dark state does not become sufficiently dark due to the dichroic limitations of dichroic dyes.
本発明はこのような課題を解決するもので、その目的と
するところは、ＰＤＬＣの前方にカラーフィルタを、ま
た後方に光吸収体を置くことによって、高コントラスト
のカラーＰＤＬＣデイスプレィを提供することにある。The present invention solves these problems, and its purpose is to provide a high-contrast color PDLC display by placing a color filter in front of the PDLC and a light absorber behind it. be.
［課題を解決するための手段］
本発明の液晶表示素子は、ＰＤＬＣと、これを挟んで両
側に配置された電極基板とからなる液晶表示素子におい
て、前記２枚の電極基板の内の観察者側の電極基板にカ
ラーフィルタを備え、かつ前記ＰＤＬＣを挟んで観察者
と反対側に光吸収体を配置したことを特徴とする。[Means for Solving the Problems] The liquid crystal display element of the present invention includes a PDLC and electrode substrates disposed on both sides of the PDLC. It is characterized in that a color filter is provided on the side electrode substrate, and a light absorber is placed on the side opposite to the viewer with the PDLC in between.
また、前記カラーフィルタが、吸収波長帯の異なる少な
くとも３種類のマイクロカラーフィルタを配列したもの
であることを特徴とする。Further, the color filter is characterized in that at least three types of micro color filters having different absorption wavelength bands are arranged.
［作用］
本発明の液晶表示素子は、電圧無印加時にはＰＤＬＣが
散乱して白くなるため、ＰＤＬＣ前方のカラーフィルタ
の色が鮮やかに見える。一方電圧印加時にはＰＤＬＣが
透明になるため、ＰＤ ＬＣ後方の光吸収体の作用で表
示が黒くなる。光吸収体を用いると暗状態が非常に暗く
なるため、高いコントラストが得られる。[Function] In the liquid crystal display element of the present invention, when no voltage is applied, the PDLC is scattered and becomes white, so the color of the color filter in front of the PDLC appears vivid. On the other hand, when a voltage is applied, the PDLC becomes transparent, so the display becomes black due to the action of the light absorber behind the PDLC. Using a light absorber makes the dark state very dark, resulting in high contrast.
以下、実施例により本発明の詳細を示す。Hereinafter, the details of the present invention will be shown by examples.
［実施例］
第１図は、本発明の液晶表示素子の断面図である。図中
、１はＰＤＬＣ，２は光吸収体、３はマイクロカラーフ
ィルタである。光吸収体としては無光沢黒紙を、マイク
ロカラーフィルタとしては染色法で作製した赤、緑、青
のフィルタを用いた。[Example] FIG. 1 is a cross-sectional view of a liquid crystal display element of the present invention. In the figure, 1 is a PDLC, 2 is a light absorber, and 3 is a micro color filter. Matte black paper was used as the light absorber, and red, green, and blue filters made by a dyeing method were used as the microcolor filters.
また、１１は上基板、１２は下基板、１３は透明電極、
１４は液晶、１５はスポンジ状高分子である。液晶には
正の誘電異方性を有するネマチック液晶を、また高分子
にはＰＭＭＡを用いた。ＰＤＬＣと光吸収体との間には
約２ｃｍの距離をあけて、ＰＤＬＣの後方からも周囲光
が取り込めるようにしている。Further, 11 is an upper substrate, 12 is a lower substrate, 13 is a transparent electrode,
14 is a liquid crystal, and 15 is a sponge-like polymer. A nematic liquid crystal having positive dielectric anisotropy was used as the liquid crystal, and PMMA was used as the polymer. A distance of about 2 cm is left between the PDLC and the light absorber so that ambient light can be taken in from behind the PDLC.
本発明の液晶表示素子は、前述のように電圧無印加時に
着色状態、電圧印加時に暗状態となり、高いコントラス
トでカラー表示ができる。また３色のカラーフィルタの
組合せにより、８色のマルチカラー表示が可能である。As described above, the liquid crystal display element of the present invention is in a colored state when no voltage is applied and is in a dark state when a voltage is applied, and can display colors with high contrast. Furthermore, by combining three color filters, multicolor display of eight colors is possible.
なお、この液晶表示素子は、偏光板を必要としないため
、バックライト無しでも充分に明るい。Note that this liquid crystal display element does not require a polarizing plate, so it is sufficiently bright even without a backlight.
また、観察者の眼には直接入らない位置に、ＰＤＬＣを
後方から照明する光源５を置くことによって、さらに明
るい表示を得ることもできる。In addition, an even brighter display can be obtained by placing the light source 5 that illuminates the PDLC from behind in a position that is not directly visible to the observer's eyes.
［発明の効果］
以上述べたように、本発明によれば、ＰＤ ＬＣの前方
にカラーフィルタを、また後方に光吸収体を置くことに
よって、高コントラストのカラーＰＤＬＣデイスプレィ
を提供することができる。[Effects of the Invention] As described above, according to the present invention, a high-contrast color PDLC display can be provided by placing a color filter in front of the PDLC and a light absorber behind it.
５− 第１図は、本発明の液晶表示素子の断面図である。 第２図は、従来の液晶表示素子の断面図である。 １、 ＰＤＬＣ ２、光吸収体 ３、マイクロカラーフィルタ ４、カラーフィルタ ５、照明光源 １１、上基板 １２、下基板 １３、透明電極 １４、液晶 １５、スポンジ状高分子 １６．２色性色素を混合した液晶 以 上 5- FIG. 1 is a sectional view of a liquid crystal display element of the present invention. FIG. 2 is a cross-sectional view of a conventional liquid crystal display element. 1.PDLC 2. Light absorber 3. Micro color filter 4. Color filter 5. Light source 11. Upper board 12. Lower board 13. Transparent electrode 14.LCD 15. Sponge-like polymer 16. Liquid crystal mixed with dichroic dye that's all
Claims (2)
膜と、これを挟んで両側に配置された電極基板とからな
る液晶表示素子において、前記２枚の電極基板の内の観
察者側の電極基板にカラーフィルタを備え、かつ前記高
分子・液晶複合膜を挟んで観察者と反対側に光吸収体を
配置したことを特徴とする液晶表示素子。(1) In a liquid crystal display element consisting of a polymer/liquid crystal composite film in which liquid crystal is dispersed in a thin polymer film, and electrode substrates placed on both sides of the film, an observer of the two electrode substrates 1. A liquid crystal display element comprising a color filter on a side electrode substrate, and a light absorber disposed on a side opposite to an observer with the polymer/liquid crystal composite film in between.
くとも３種類のマイクロカラーフィルタを配列したもの
であることを特徴とする請求項１記載の液晶表示素子。(2) The liquid crystal display element according to claim 1, wherein the color filter is an array of at least three types of micro color filters having different absorption wavelength bands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1327610A JPH03186816A (en) | 1989-12-18 | 1989-12-18 | Liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1327610A JPH03186816A (en) | 1989-12-18 | 1989-12-18 | Liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03186816A true JPH03186816A (en) | 1991-08-14 |
Family
ID=18200979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1327610A Pending JPH03186816A (en) | 1989-12-18 | 1989-12-18 | Liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03186816A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0854612A (en) * | 1994-07-21 | 1996-02-27 | At & T Global Inf Solutions Internatl Inc | Liquid crystal display |
| US5903329A (en) * | 1992-07-02 | 1999-05-11 | Fujitsu Limited | Reflective type LCD with color filters having black portions |
| US6166834A (en) * | 1996-03-15 | 2000-12-26 | Matsushita Electric Industrial Co., Ltd. | Display apparatus and method for forming hologram suitable for the display apparatus |
| US6657766B2 (en) | 2000-03-31 | 2003-12-02 | Sharp Kabushiki Kaisha | Reflective display device and retro-reflector used therefor |
| US6788366B2 (en) | 2001-12-26 | 2004-09-07 | Sharp Kabushiki Kaisha | Display device including corner cube array |
| US6787976B2 (en) | 2000-10-18 | 2004-09-07 | Sharp Kabushiki Kaisha | Luminous display element including an optical member for reflecting light in a direction opposite to an incident direction |
| 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 |
| US7522243B2 (en) | 2002-03-01 | 2009-04-21 | Sharp Kabushiki Kaisha | Display device and method for fabricating the display device |
-
1989
- 1989-12-18 JP JP1327610A patent/JPH03186816A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5903329A (en) * | 1992-07-02 | 1999-05-11 | Fujitsu Limited | Reflective type LCD with color filters having black portions |
| JPH0854612A (en) * | 1994-07-21 | 1996-02-27 | At & T Global Inf Solutions Internatl Inc | Liquid crystal display |
| US6166834A (en) * | 1996-03-15 | 2000-12-26 | Matsushita Electric Industrial Co., Ltd. | Display apparatus and method for forming hologram suitable for the display apparatus |
| US6844956B2 (en) | 2000-03-31 | 2005-01-18 | Sharp Kabushiki Kaisha | Reflective display device and retro-reflector used therefor |
| US6657766B2 (en) | 2000-03-31 | 2003-12-02 | Sharp Kabushiki Kaisha | Reflective display device and retro-reflector used therefor |
| US6898018B2 (en) | 2000-10-18 | 2005-05-24 | Sharp Kabushiki Kaisha | Luminous display element |
| US6787976B2 (en) | 2000-10-18 | 2004-09-07 | Sharp Kabushiki Kaisha | Luminous display element including an optical member for reflecting light in a direction opposite to an incident direction |
| 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 |
| 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 |
| 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 |
| 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 |
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