JPH03171117A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPH03171117A JPH03171117A JP1312905A JP31290589A JPH03171117A JP H03171117 A JPH03171117 A JP H03171117A JP 1312905 A JP1312905 A JP 1312905A JP 31290589 A JP31290589 A JP 31290589A JP H03171117 A JPH03171117 A JP H03171117A
- Authority
- JP
- Japan
- Prior art keywords
- light
- liquid crystal
- polarizer
- diffuser
- display element
- 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 26
- 238000005286 illumination Methods 0.000 claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000010287 polarization Effects 0.000 abstract description 9
- 230000000007 visual effect Effects 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 abstract 2
- 230000005684 electric field Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal 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,時計や電卓等の小型電子機器用表示素子,計
測機器.OA機器等のキャラクタ・グラフィック用表示
装置.車や航空機等の車載用表示装置あるいは小型テレ
ビ等の画像用表示装置として利用される液晶表示素子に
関丁る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to display elements for small electronic devices such as watches and calculators, and measuring instruments. Character/graphic display devices for OA equipment, etc. It relates to liquid crystal display elements used as in-vehicle display devices such as cars and airplanes, or image display devices such as small televisions.
従来.この種液晶表示素子としては,WEEにより光に
対する旋光性が変化する液晶,たとえば亭ツイステッド
・ネマティック型液晶(以下TN型液晶というノを用い
たものが最も普及している。Conventional. The most popular type of liquid crystal display element is one using a liquid crystal whose optical rotation with respect to light is changed by WEE, such as a twisted nematic type liquid crystal (hereinafter referred to as TN type liquid crystal).
従来のTN型液晶を用いたもの[j?いては,視線方向
に工シ入射光及び出射光の入射角及び出射角により光の
旋光能が異なるため,コントラストO視野角依存性が大
きく.また偏光特性を持ったサングラス,フィ/L/夕
一等の素子を通してはその偏光方向にエク表示の読み取
シに支障をきたすという問題点金有していた。この視野
角依存性は透過照射付液晶表示素子とすることでいくぶ
ん改善されるが,充分といえる程のものではない。Those using conventional TN type liquid crystal [j? In this case, the optical rotation power of light differs depending on the incident and exit angles of the incident light and outgoing light in the line of sight direction, so the dependence of the contrast on the viewing angle is large. In addition, there is a problem in that when the polarized light is passed through elements such as sunglasses, Fi/L/Yuichi, etc., the direction of polarization interferes with the reading of the display. This viewing angle dependence can be improved to some extent by using a liquid crystal display element with transmitted illumination, but it is not sufficient.
本発明は,このような問題点Vc@みてなされたもので
あク.その目的と丁るところは,コントラストの視野依
存性が小さく,表示Q偏光度O小さい液晶表示素子會提
供しようと丁るものである・〔課題を解決するため0手
段〕
上記目的金達戒丁るために,本発明vc釦ける液晶表示
素子は,電圧によシ光に対する旋光性が変化する液晶を
1対の@光子の間に配置させた透過照明付液晶表示素子
の出射光側偏光子([光千ノの外側VC接してディフュ
ーザ金設けてなるものである・
上記ディ7ユーザは出射光(透過光ノを散乱光に丁るた
めにエネμギの損失が大きく7このため透過照明−yt
I7)輝度が高いことが必要であり,1た一般に透過照
明光は平行光でないため半影ぼけが生じるが,これは液
晶,偏光子(挨光子ノ及びディフューザを近接して配置
することに工り防止できる。The present invention was made in view of these problems. The purpose of this is to provide a liquid crystal display device in which the dependence of the contrast on the viewing field is small and the display Q and polarization degree O are small. In order to achieve this, the liquid crystal display element with the vc button of the present invention uses a polarizer on the outgoing light side of a liquid crystal display element with transmitted illumination, in which a liquid crystal whose optical rotation for light changes depending on voltage is placed between a pair of @photons. (A diffuser metal is provided on the outside of the light source in contact with the VC.) The above-mentioned di7 user has a large loss of energy μ because the emitted light (transmitted light) is divided into scattered light7.For this reason, transmitted illumination is -yt
I7) High brightness is required, and penumbra blur occurs because transmitted illumination light is generally not parallel light, but this can be solved by placing the liquid crystal, polarizer (photon dust), and diffuser close together. can be prevented.
尖鋭な像(表示ノ金得るためには,透過照明をレーザに
して,平行光を入射させればよい・でらに.上記ディフ
ューザを螢光体と丁ることによV透過照明光に可視光以
外Q光源を使用丁ることもできる。たとえば,透過照明
光に水銀灯り放tt利用し,ディフューザとして螢光体
を塗布した紫外光カット用フイμタ(ガラス)k用いる
ことができる。In order to obtain a sharp image (display), the transmitted illumination can be made into a laser and parallel light is incident. It is also possible to use a Q light source other than light. For example, a mercury lamp can be used as the transmitted illumination light, and an ultraviolet light cutting filter (glass) coated with a phosphor can be used as a diffuser.
〔作 用〕
透過照明光は偏光子,液晶.偏光子(倹光子ノを通過し
てディフューザに投射される。デイフユーザは出射側偏
光子(検光千ノからの偏光した光(保ノヲ散乱させ.ほ
ぼ自然光に近いものとし,1た等万散乱によ夛視野角度
依存性を減じるように働く。[Function] The transmitted illumination light is a polarizer and a liquid crystal. The diffuser passes through a polarizer (analyzer) and is projected onto a diffuser. It also works to reduce viewing angle dependence.
実施例について図面を参照して説明丁ると,第1図にk
いて.高輝度透過照明光源1から出た光は.偏光子2會
通ることKエク直線偏光に変換されてTN型液晶3へ入
射する。TN型液晶3は,たとえば液晶層のねじれ角が
90°と丁ると,t極4,4間に電圧を印加した場合K
は液晶分子の配列方向がその分子長軸を電界方向とほぼ
平行に揃え.他方無電界の場合には,入射した光を液晶
3層に沿ってその偏波面金90’ 回転(旋光ノさせる
・したがって.偏光子5l7)@光万向が偏光子2の偏
光万向と同一万向と丁ると.[圧印Mi#には偏光子2
を通過した光は直線偏光を保持し,偏光子5全通過丁る
。″jなわち,明状態となる・他方1圧無印加時には偏
光子2を通過した光はその偏波面ヲ90゜回転させられ
る結果,偏光子5の偏光方向がこれと直交しているため
,光は偏光子5を通過することができない。すなわち,
光は遮断され暗状態となる。この明暗0パターンを表示
情報として用いる。When explaining the embodiment with reference to the drawings, Fig. 1 shows k.
Stay. The light emitted from the high-intensity transmitted illumination light source 1 is. The light passes through two polarizers, is converted into linearly polarized light, and enters the TN liquid crystal 3. For example, in the TN type liquid crystal 3, if the twist angle of the liquid crystal layer is 90°, when a voltage is applied between the t-poles 4,
In this case, the alignment direction of the liquid crystal molecules is such that the long axis of the molecules is almost parallel to the direction of the electric field. On the other hand, in the case of no electric field, the incident light is rotated along the three liquid crystal layers by its polarization plane gold 90' (rotation of light, therefore, polarizer 5l7) @ the direction of light is the same as the direction of polarization of polarizer 2. When it comes to 10,000 directions. [Polarizer 2 for Coining Mi#
The light that has passed remains linearly polarized and passes through the polarizer 5 all the way through. ``j, that is, it becomes a bright state.On the other hand, when no voltage is applied, the light passing through the polarizer 2 has its polarization plane rotated by 90 degrees, and as a result, the polarization direction of the polarizer 5 is perpendicular to this, so Light cannot pass through the polarizer 5, i.e.
Light is blocked and it becomes dark. This bright/dark 0 pattern is used as display information.
偏光子5を通過した光はデイフユーザ6に投影され,デ
ィフューザ6上の情報はほぼ自然光に近い状態で散乱笛
れる。ディフューザ6からの光はほぼ完全な散乱光と仮
定すれば,ラン/ヘートの余弦法則に従うため,コント
ヲストの視野角依存性は急峻[はならず,視線位置にと
らわれない表示を行うことが可能となる。1た,自然光
に近いので,g4光特性を持った素子(偏光サングラス
等ノを通じても表示情報を読み取ることができる。The light passing through the polarizer 5 is projected onto a diffuser 6, and the information on the diffuser 6 is scattered in a state almost similar to natural light. Assuming that the light from the diffuser 6 is almost completely scattered light, it follows Rann/Haert's law of cosines, so the viewing angle dependence of the contrast is not steep, and it is possible to display images that are independent of the viewing position. Become. Furthermore, since it is close to natural light, the displayed information can be read even through devices with G4 light characteristics (such as polarized sunglasses).
本発明は,以上説明し7tよ′)に構成されているりで
,コントラストの視野角依存性,表示の偏光度が小さい
ため視認性が向上し.車載表示装置等輻広い用途に.し
かも好適に供することができ,2fc透過照明光の光源
としてレーザ,紫外光源等の広範な光源を使用すること
ができる。As explained above, the present invention is configured in the 7t'), and the viewing angle dependence of the contrast and the degree of polarization of the display are small, so visibility is improved. For a wide range of applications such as in-vehicle display devices. Moreover, it can be suitably provided, and a wide range of light sources such as lasers and ultraviolet light sources can be used as the light source for the 2fc transmitted illumination light.
第1図は本発明の液晶表示素子を示″t′斜視図である
。
1・・・透過照明光源 2,5・・・偏光子3・・
・TN型液晶 4.4・・・電極6・・・ディフ
ューザFIG. 1 is a perspective view showing the liquid crystal display element of the present invention. 1... Transmitted illumination light source 2, 5... Polarizer 3...
・TN type liquid crystal 4.4... Electrode 6... Diffuser
Claims (1)
光子の間に配置させた透過照明付液晶表示素子において
、出射光側偏光子の外側に接してディフューザを設けた
ことを特徴とする液晶表示素子。A liquid crystal display element with transmitted illumination in which a liquid crystal whose optical rotation for light changes depending on a voltage is arranged between a pair of polarizers, characterized in that a diffuser is provided in contact with the outside of the polarizer on the output light side. display element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1312905A JPH03171117A (en) | 1989-11-30 | 1989-11-30 | Liquid crystal display element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1312905A JPH03171117A (en) | 1989-11-30 | 1989-11-30 | Liquid crystal display element |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03171117A true JPH03171117A (en) | 1991-07-24 |
Family
ID=18034871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1312905A Pending JPH03171117A (en) | 1989-11-30 | 1989-11-30 | Liquid crystal display element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03171117A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5629784A (en) * | 1994-04-12 | 1997-05-13 | Ois Optical Imaging Systems, Inc. | Liquid crystal display with holographic diffuser and prism sheet on viewer side |
WO1997017631A1 (en) * | 1995-11-06 | 1997-05-15 | Seiko Epson Corporation | Illuminator, liquid crystal display using the illuminator and electronic device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5739084B2 (en) * | 1974-09-06 | 1982-08-19 | ||
JPS57204515A (en) * | 1981-06-11 | 1982-12-15 | Seiko Epson Corp | Liquid crystal display body |
JPS61148430A (en) * | 1984-12-24 | 1986-07-07 | Canon Inc | Liquid crystal display device |
JPS62194227A (en) * | 1986-02-20 | 1987-08-26 | Matsushita Electric Ind Co Ltd | Light emission type display device |
-
1989
- 1989-11-30 JP JP1312905A patent/JPH03171117A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5739084B2 (en) * | 1974-09-06 | 1982-08-19 | ||
JPS57204515A (en) * | 1981-06-11 | 1982-12-15 | Seiko Epson Corp | Liquid crystal display body |
JPS61148430A (en) * | 1984-12-24 | 1986-07-07 | Canon Inc | Liquid crystal display device |
JPS62194227A (en) * | 1986-02-20 | 1987-08-26 | Matsushita Electric Ind Co Ltd | Light emission type display device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5629784A (en) * | 1994-04-12 | 1997-05-13 | Ois Optical Imaging Systems, Inc. | Liquid crystal display with holographic diffuser and prism sheet on viewer side |
WO1997017631A1 (en) * | 1995-11-06 | 1997-05-15 | Seiko Epson Corporation | Illuminator, liquid crystal display using the illuminator and electronic device |
US6011602A (en) * | 1995-11-06 | 2000-01-04 | Seiko Epson Corporation | Lighting apparatus with a light guiding body having projections in the shape of a trapezoid |
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