JPS59116721A - Liquid-crystal display device - Google Patents
Liquid-crystal display deviceInfo
- Publication number
- JPS59116721A JPS59116721A JP57226158A JP22615882A JPS59116721A JP S59116721 A JPS59116721 A JP S59116721A JP 57226158 A JP57226158 A JP 57226158A JP 22615882 A JP22615882 A JP 22615882A JP S59116721 A JPS59116721 A JP S59116721A
- Authority
- JP
- Japan
- Prior art keywords
- light
- polarizing plate
- liquid crystal
- display
- voltage
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はＴ Ｎ形液晶表示装置に係り、特（こ透過形ネ
ガタイプで極めて高いコントラストが得られる液晶表示
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a TN type liquid crystal display device, and more particularly to a transmissive negative type liquid crystal display device that can obtain extremely high contrast.
従来の透過形ネガタイプのＴＮ形液晶表示装置は、一対
の偏光板の偏光軸が互に平行になるように配置して構成
されたものである。この様に構成されたＴＮ形液晶表示
装置においては、電圧を印加しない部分は一方の偏光板
を透過した光が液晶層により偏光面が９００回転し、他
の偏光板を透過できないのに対し、電圧を印加した部分
は一方の偏光板を透過した光が液晶層で偏光面が回転さ
れず、そのま才他の偏光板を透過できる。このように暗
い背景の中に電圧を印加した部分のみが明るくなるネガ
タイプの表示が可能である。A conventional transmission type negative type TN type liquid crystal display device is constructed by arranging a pair of polarizing plates such that their polarization axes are parallel to each other. In the TN type liquid crystal display device configured in this way, in the part where no voltage is applied, the light that passes through one polarizing plate has its polarization plane rotated by 900 degrees due to the liquid crystal layer, and cannot pass through the other polarizing plate. In the part to which a voltage is applied, the light that has passed through one polarizing plate is not rotated by the liquid crystal layer and can pass through the other polarizing plate. In this way, a negative type display is possible in which only the part to which a voltage is applied becomes bright against a dark background.
ところが、この方式の表示装置には次のような欠点があ
る。第１の欠点は、ＯＦ２時における光の遮へい性が悪
いため高いコントラストが得難い。However, this type of display device has the following drawbacks. The first drawback is that it is difficult to obtain high contrast due to poor light shielding properties during OF2.
この欠点は、偏光度の高い偏光板を用いたり、液晶中に
黒の二色性色素を添加することにより、ある程度改善し
うるが限度がある。これは直線偏光が液晶層を通過する
ことにより楕円偏光になるという本質的な問題があるた
めである。This drawback can be improved to some extent by using a polarizing plate with a high degree of polarization or by adding a black dichroic dye to the liquid crystal, but there is a limit. This is due to the essential problem that linearly polarized light becomes elliptically polarized light when it passes through a liquid crystal layer.
第２の欠点は、ＯＦ２時の透過光が液晶セルの場所や見
る方向によって一様でなく、着色した模様となって観察
されることである。これは０ ）” Ｆ時の透過率が△
ｎ−ｄ（△ｎ二液晶の屈折率異方性、ｄ：液晶層厚さ）
および光の波長に依存するためである。The second drawback is that the transmitted light during OF2 is not uniform depending on the location of the liquid crystal cell or the viewing direction, and a colored pattern is observed. This is 0)” The transmittance at F is △
n-d (Δn refractive index anisotropy of two liquid crystals, d: liquid crystal layer thickness)
This is because it depends on the wavelength of the light.
このような問題の対策として、表示部以外の部分に遮光
性の膜を設けることが提案されているが、背景と非点灯
部の透過率が異るという問題が生ずる。As a countermeasure to this problem, it has been proposed to provide a light-shielding film in areas other than the display area, but this poses a problem in that the transmittance of the background and the non-lit area are different.
本発明の目的は、従来見られた様な着色ムラのない、か
つ極めて高いコントラストが実現できる透過形ネガタイ
プのＴＮ形液晶表示装置を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission negative type TN type liquid crystal display device that is free from uneven coloring and can achieve extremely high contrast as seen in the past.
本発明はＴＮ形液晶表示装置において、一対の偏光板を
互に偏光軸が直交するように配置し、液晶セルまたは偏
光板上のいずれかに各表示部に対応する部分に、この表
示部の面積より小さな窓を有する遮光性の膜を設けたこ
とを特徴とする。The present invention provides a TN type liquid crystal display device in which a pair of polarizing plates are arranged such that their polarization axes are orthogonal to each other, and the display portion is placed on either the liquid crystal cell or the polarizing plate at a portion corresponding to each display portion. It is characterized by providing a light-shielding film having a window smaller than the area.
以下、本発明を図示の一実施例により説明・する。 The present invention will be explained below with reference to an illustrated embodiment.
一対の透明電極基板１．２の対向面には、それぞれ透明
電極３．４が形成されており、更ｌこ一方の透明電極３
上には、前記一対の透明電極３．４で形成される表示部
に対応する部分に、この表示部の面積より小さな窓を有
する遮光膜５が設けられている。そして、前記透明電極
基板１．２の周囲をシール材６でシールし、内部に液晶
を封入して液晶層７が形成されている。またガラス基板
１．２の外側（こはそれぞれ偏光板８．９が配置されて
いる。Transparent electrodes 3.4 are formed on opposing surfaces of the pair of transparent electrode substrates 1.2, respectively.
Above, a light shielding film 5 having a window smaller than the area of the display section is provided in a portion corresponding to the display section formed by the pair of transparent electrodes 3.4. The periphery of the transparent electrode substrate 1.2 is sealed with a sealing material 6, and liquid crystal is sealed inside to form a liquid crystal layer 7. Polarizing plates 8.9 are also arranged on the outside of the glass substrate 1.2.
次に作用について説明する。偏光板８．９は偏光軸を直
交して配置されるため、電圧を印加しないとき、偏光板
８を透過した光は液晶層７により偏光面が９０°回転さ
れ、そのまま偏光板９を透過する。電圧を印加すると、
偏光板８を透過した光は液晶層７により偏光面が回転さ
れずそのまま偏光板９に達するため、偏光板９を透過で
きない。Next, the effect will be explained. Since the polarizing plates 8 and 9 are arranged with the polarization axes perpendicular to each other, when no voltage is applied, the polarization plane of the light transmitted through the polarizing plate 8 is rotated by 90 degrees by the liquid crystal layer 7, and the light passes through the polarizing plate 9 as is. . When voltage is applied,
The light transmitted through the polarizing plate 8 cannot be transmitted through the polarizing plate 9 because the plane of polarization is not rotated by the liquid crystal layer 7 and reaches the polarizing plate 9 as is.
表示部以外の背景部分は遮光膜５により光は完全に遮へ
いされるため、′電圧のＯＮ、ＯＦＦにより、黒地に白
のネガタイプの表示が可能である。Since light is completely shielded from the background portion other than the display portion by the light shielding film 5, a negative type display of white on a black background is possible by turning the voltage ON and OFF.
ただし、この方式では電圧のＯＮ、ＯＦＦと表示の”Ｏ
Ｎ”、“ＯＦＦ”が従来と逆の関係になる。However, with this method, the voltage ON/OFF and the display "O"
The relationship between "N" and "OFF" is opposite to that of the conventional method.
本発明で高いコントラストが得られるのは、電圧印加時
の遮へい性が極めて優れていることによる。電圧を印加
したとき、液晶分子は基板面に垂直に配向しているため
、偏光板８を透過した直線偏光は殆どそのままの状態で
液晶層７を通過し、偏光板９で効果的に遮へいされる。The high contrast obtained in the present invention is due to the extremely excellent shielding properties when voltage is applied. When a voltage is applied, the liquid crystal molecules are oriented perpendicularly to the substrate surface, so the linearly polarized light that has passed through the polarizing plate 8 passes through the liquid crystal layer 7 almost unchanged, and is effectively blocked by the polarizing plate 9. Ru.
表１は、従来の透過形ネガタイプの液晶表示装置と本発
明による液晶表示装置のコントラストを比較したもので
ある。どちらも偏光板は三立電機株式会社のＬＣ２−８
１，−１８、液晶はチッソ株式会社の１５１０Ｔ−６４
を用いた。Table 1 compares the contrast between a conventional transmissive negative type liquid crystal display device and a liquid crystal display device according to the present invention. The polarizing plate for both is Sanritsu Electric Co., Ltd.'s LC2-8.
1,-18, the liquid crystal is Chisso Corporation's 1510T-64
was used.
表１
表２は本発明の表示装置の電圧によるコントラスト変化
を示したものである。Table 1 Table 2 shows the contrast change depending on the voltage of the display device of the present invention.
表２
この様に本発明は電圧が高くなる程遮へい性が向上し、
コントラストが向上する。実施例では約８Ｖで飽和Ｌ／
、１６００以上のコントラストが得られる。Table 2 In this way, the shielding performance of the present invention improves as the voltage increases,
Contrast is improved. In the example, the saturated L/
, a contrast of 1600 or more can be obtained.
なお、上記実施例（こおいては、遮光膜５を透明電極基
板１の内側番こ形成したが、外側に形成し°Ｃも、また
偏光板８上に形成してもよい。In the above embodiment, the light shielding film 5 is formed on the inside of the transparent electrode substrate 1, but it may be formed on the outside or on the polarizing plate 8.
本発明によれば、着色むらがなく、極めて高いコントラ
ストの液晶表示装置が得られる。According to the present invention, a liquid crystal display device with no uneven coloring and extremely high contrast can be obtained.
第１図は円形の表示パタンを形成した本発明の一実施例
を示す平面図、第２図は第１図Ａ −Ａの要部断面図で
ある。
１．２・・・透明電極基板、 ３．４・・・透明電極
、５・・・遮光膜、 ７・・・液晶層、 ８．
９・・・偏光板。
第１図
第２図
１４５−FIG. 1 is a plan view showing an embodiment of the present invention in which a circular display pattern is formed, and FIG. 2 is a sectional view of a main part taken along line A-A in FIG. 1.2... Transparent electrode substrate, 3.4... Transparent electrode, 5... Light shielding film, 7... Liquid crystal layer, 8.
9...Polarizing plate. Figure 1 Figure 2 145-
Claims (1)
板間にねじれ配向して挾持された誘電異方性が正のネマ
チック液晶層と、前記電極基板の両側に偏光軸を互に直
交して配置した一対の偏光板を備えた透過形液晶表示装
置において、前記電極基板または前記偏光板上の上記一
対の透明電極で形成される表示部に対応する部分に、前
記表示部の面積より小さな窓を有する遮光膜を設けたこ
とを特徴とする液晶表示装置。A pair of transparent electrode substrates are arranged facing each other, a nematic liquid crystal layer with positive dielectric anisotropy is sandwiched between the electrode substrates in a twisted orientation, and polarization axes are arranged perpendicularly to each other on both sides of the electrode substrates. In a transmissive liquid crystal display device having a pair of polarizing plates arranged as shown in FIG. A liquid crystal display device comprising a light shielding film having a window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57226158A JPS59116721A (en) | 1982-12-24 | 1982-12-24 | Liquid-crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57226158A JPS59116721A (en) | 1982-12-24 | 1982-12-24 | Liquid-crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59116721A true JPS59116721A (en) | 1984-07-05 |
Family
ID=16840766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57226158A Pending JPS59116721A (en) | 1982-12-24 | 1982-12-24 | Liquid-crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59116721A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62173719U (en) * | 1986-04-23 | 1987-11-05 | ||
| JPS6349523U (en) * | 1986-09-18 | 1988-04-04 | ||
| JPS63269124A (en) * | 1987-04-28 | 1988-11-07 | Asahi Glass Co Ltd | Twisted nematic liquid crystal display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4924454A (en) * | 1972-06-29 | 1974-03-04 | ||
| JPS5483863A (en) * | 1977-12-16 | 1979-07-04 | Seiko Instr & Electronics Ltd | Electronic watch using liquid crystal display |
| JPS5773173A (en) * | 1980-10-23 | 1982-05-07 | Seiko Epson Corp | Electroless plated body |
-
1982
- 1982-12-24 JP JP57226158A patent/JPS59116721A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4924454A (en) * | 1972-06-29 | 1974-03-04 | ||
| JPS5483863A (en) * | 1977-12-16 | 1979-07-04 | Seiko Instr & Electronics Ltd | Electronic watch using liquid crystal display |
| JPS5773173A (en) * | 1980-10-23 | 1982-05-07 | Seiko Epson Corp | Electroless plated body |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62173719U (en) * | 1986-04-23 | 1987-11-05 | ||
| JPS6349523U (en) * | 1986-09-18 | 1988-04-04 | ||
| JPS63269124A (en) * | 1987-04-28 | 1988-11-07 | Asahi Glass Co Ltd | Twisted nematic liquid crystal display device |
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