JPS62134625A - Liquid crystal display body - Google Patents
Liquid crystal display bodyInfo
- Publication number
- JPS62134625A JPS62134625A JP60276488A JP27648885A JPS62134625A JP S62134625 A JPS62134625 A JP S62134625A JP 60276488 A JP60276488 A JP 60276488A JP 27648885 A JP27648885 A JP 27648885A JP S62134625 A JPS62134625 A JP S62134625A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- polarizing plate
- polarizing
- crystal layer
- degrees
- 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
- G02F1/1397—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 the twist being substantially higher than 90°, e.g. STN-, SBE-, OMI-LC cells
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Liquid Crystal (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液晶のねじれ角を９０度をこえる角度にする
ことによって時分割駆動特性を向上させた液晶表示体に
関するものである。−
〔発明の概要〕
本発明は、液晶のねじれ角が９０度をこえる液晶表示体
において、二枚の偏光板の少くとも一方に可視領域の全
波長の光に対して偏光能をもつ二枚の偏光板を用いて液
晶層をはさむ場合に吸収される波長領域の光に対しては
偏光能をもたない偏光板を用いることにより、可視領域
の全波長の光が液晶表示体を透過するようにして、表示
部の非点灯部分をほとんど無色透明にするものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display whose time-division drive characteristics are improved by making the twist angle of the liquid crystal more than 90 degrees. - [Summary of the Invention] The present invention provides a liquid crystal display in which the twist angle of the liquid crystal exceeds 90 degrees. By using a polarizing plate that does not have the ability to polarize light in the wavelength range that is absorbed when a liquid crystal layer is sandwiched between two polarizing plates, light of all wavelengths in the visible range can pass through the liquid crystal display. In this way, the non-lit parts of the display section are made almost colorless and transparent.
〔従来の技術〕
液晶のねじれ角が９０度をこえる液晶表示体の従来例と
しては、たとえばＳより ８５ Ｄ工ＧＥＳＴのＰ
、１２０からＰ、１２３に示されるＳＢＥ液晶表示体、
また特開昭６０−１６２２２５および特開昭６０−１６
２２２６に示されるようなものが知られている。これら
の液晶表示体の長所は、一般に普及している液晶のねじ
れ角がほぼ９０度のＴＮ型液晶表示体に比較して時分割
駆動特性がすぐれていることである。[Prior art] Conventional examples of liquid crystal display bodies in which the twist angle of the liquid crystal exceeds 90 degrees include, for example, P from S 85 D Engineering GEST.
, 120 to P, 123;
Also, JP-A-60-162225 and JP-A-60-16
2226 is known. The advantage of these liquid crystal displays is that they have superior time-division drive characteristics compared to the generally popular TN type liquid crystal display whose twist angle is approximately 90 degrees.
〔発明が解決しようとする問題点及び目的〕しかし、前
述の従来技術では表示部の非点灯部分が必ず有色になる
という問題点があった。これまでに普及している液晶表
示体の表示部は、特殊用途を目的とするカラー液晶表示
体を除けば一般に無色透明である。このことは、液晶表
示体の場合には表示部が有色であると人間が不快感を感
じることによるものと考えられる。したがって前述の従
来技術において表示部が有色であることは重大な欠点で
ある。[Problems and Objects to be Solved by the Invention] However, the above-mentioned conventional technology has a problem in that the non-lit portions of the display section always become colored. The display portions of liquid crystal displays that have been in widespread use so far are generally colorless and transparent, except for color liquid crystal displays intended for special purposes. This is considered to be because, in the case of a liquid crystal display, humans feel uncomfortable when the display section is colored. Therefore, in the prior art described above, the fact that the display section is colored is a serious drawback.
そこで本発明はこのような問題点を解決するものであっ
て、その目的はすぐれた時分割駆動特性を有し、しかも
表示部の非点灯部分がほとんど無色透明である液晶表示
体を提供することである。SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and its purpose is to provide a liquid crystal display having excellent time-division drive characteristics and in which the non-lit portion of the display portion is almost colorless and transparent. It is.
本発明の液晶表示体は、対向配置された二枚の透明基板
、該西明基板に支持され９０度をこえる角度にねじられ
たらせん構造をもつ液晶層、該液晶層をはさんで対向す
る二枚の偏光板から構成される液晶表示体において、二
枚の偏光板の少くとも一方は、可視領域の全波長の光に
対して偏光能をもつ二枚の偏光板を用いて前記液晶層を
はさむ場合に吸収される波長領域の光に対しては偏光能
をもたないことを特徴とする。The liquid crystal display of the present invention includes two transparent substrates arranged oppositely, a liquid crystal layer supported by the Saimei substrate and having a spiral structure twisted at an angle of more than 90 degrees, and two transparent substrates facing each other with the liquid crystal layer in between. In a liquid crystal display composed of two polarizing plates, at least one of the two polarizing plates has the ability to polarize light of all wavelengths in the visible region. It is characterized by having no polarization ability for light in the wavelength range that is absorbed when sandwiching the light.
可視領域の全波長の光に対して偏光能をもつ二枚の偏光
板を用いてねじれ角が９０度をこえる液晶層をはさむ場
合に、ある波長領域の光が吸収されて有色に見える理由
は、その波長領域の光が第一の偏光板によってかたよっ
た光となり、液晶層によって旋光されて第二の偏光板を
透過しようとするとき、その光のかたよりのベクトルの
方向が第二の偏光板の偏光軸と直交するために実際には
第二の偏光板に吸収されて透過できないことである。し
たがって、そのような波長領域の光を透過させるために
は、第一の偏光板がその光をかたよらせないようにする
か、あるいは第二の偏光板がその波長領域のかたよった
光を吸収しないようにすればよい。すなわち、第一の偏
光板と第二の偏光板の少くとも一方がその波長領域の光
に対して偏光能をもたなければよい。このことは本発明
の上記の構成によってまさに実現されており、それゆえ
に本発明の液晶表示体では可視領域の全波長の光が透過
可能となって、表示部は無色透明に見えることになる。When a liquid crystal layer with a twist angle of more than 90 degrees is sandwiched between two polarizing plates that have the ability to polarize light of all wavelengths in the visible range, the reason why light in a certain wavelength range is absorbed and appears colored is why , when the light in that wavelength range becomes biased light by the first polarizing plate, is rotated by the liquid crystal layer, and is about to pass through the second polarizing plate, the direction of the vector of the biased light is the polarizing light of the second polarizing plate. Since the light is perpendicular to the polarization axis of the light, it is actually absorbed by the second polarizing plate and cannot be transmitted. Therefore, in order to transmit light in such a wavelength range, the first polarizing plate must not bias the light, or the second polarizing plate must not absorb the biased light in that wavelength range. Just do it like this. That is, it is sufficient that at least one of the first polarizing plate and the second polarizing plate has polarizing ability for light in the wavelength range. This is exactly achieved by the above configuration of the present invention, and therefore, the liquid crystal display of the present invention allows light of all wavelengths in the visible region to pass through, and the display portion appears colorless and transparent.
我々は、液晶層の厚さをｄ１液晶の屈折率異方性をΔｎ
１液晶のティルト角の平均値をθとしてΔル・ａ”ｃｏ
！＋θ〜α８μ、
を満足し、液晶のねじれ角が２７０度の液晶セルを用い
て第一の実験をおこなった。実験に用いた二枚の偏光板
のうち第一の偏光板は青色付近の波長領域の光の偏光能
がほとんどない青色偏光板であり、第二の偏光板は可視
領域の全波長の光に対して９５％以上の偏光能をもつ偏
光板である。このような偏光板は、まずＰＶＡｌｌ１Ｑ
を偏光度のよい染料で染色し、つづいてフィルムの流れ
方向に延伸することによって得ることができる。第２図
は本実験における液晶分子配列方向と偏光板の偏光軸方
向を示す図であって、４は第一の偏光板と隣接する液晶
層表面の液晶分子の配列方向、５は第二の偏光板と隣接
する液晶層表面の液晶分子の配列方向、６は第一の偏光
板の偏光軸方向、そして７は第二の偏光板の偏光軸方向
である。第２図かられかるように、第一の偏光板は隣接
する液晶層表面の液晶分子配列方向から液晶のねじれ方
向に６０度ずらして配置し、第二の偏光板は一一接する
液晶層表面の液晶分子配列方向から液晶のねじれ方向に
３０度ずらして配置しである。第１図はこの実験におけ
る液晶表示体の分光特性と、第一の偏光板の偏光特性を
示すグラフである。第１図のグラフにおいて横軸と縦軸
はそれぞれ波長と透過率であり、１の実線は液晶表示体
の非点灯状態の分光特性を、２の点線は第一の偏光板に
偏光軸と直交する方向にかたよった光を入射したときの
偏光板の分光特性を、そして５の一点鎖線は第一の偏光
板に偏光軸と平行な方向にかたよった光を入射したとき
の偏光板の分光特性をそれぞれ示している。第１図に示
される液晶表示体の分光特性は４００％ｍから７００％
ｍの波長の可視光線の領域において透過率がほぼ一定で
あることを示しており、また肉視によって実際にほぼ無
色透明に見えることが確保された。第５図は、本実験系
の液晶セルに電場を印加して点灯状態にしたときの液晶
表示体の点灯部分の分光特性を示すグラフであって、横
軸と縦軸はそれぞれ波長と透過率である。第５図に示さ
れる分光特性は点灯状態においても４００％ｍから５０
０ｎｍの青色付近の波長領域の光は透過していることを
示している。したがって、本実験の液晶表示体ではほぼ
無色透明の表示部に点灯部分は青色で表示されることに
なる。We define the thickness of the liquid crystal layer as d1 and the refractive index anisotropy of the liquid crystal as Δn
1 Assuming the average value of the tilt angle of the liquid crystal to be θ, Δle・a”co
! The first experiment was conducted using a liquid crystal cell that satisfied +θ to α8μ and had a liquid crystal twist angle of 270 degrees. Of the two polarizing plates used in the experiment, the first polarizing plate is a blue polarizing plate that has almost no polarizing ability for light in the wavelength region near blue, and the second polarizing plate is polarizing for light of all wavelengths in the visible region. It is a polarizing plate that has a polarizing ability of 95% or more. Such a polarizing plate is first made of PVAll1Q.
It can be obtained by dyeing the film with a dye having a good degree of polarization and then stretching it in the machine direction of the film. FIG. 2 is a diagram showing the alignment direction of liquid crystal molecules and the polarization axis direction of the polarizing plate in this experiment, where 4 is the alignment direction of the liquid crystal molecules on the surface of the liquid crystal layer adjacent to the first polarizing plate, and 5 is the alignment direction of the liquid crystal molecules on the surface of the liquid crystal layer adjacent to the first polarizing plate. 6 is the direction of alignment of liquid crystal molecules on the surface of the liquid crystal layer adjacent to the polarizing plate; 6 is the direction of the polarization axis of the first polarization plate; and 7 is the direction of the polarization axis of the second polarization plate. As can be seen from Figure 2, the first polarizing plate is arranged 60 degrees away from the liquid crystal molecular alignment direction on the surface of the adjacent liquid crystal layer in the twisting direction of the liquid crystal, and the second polarizing plate is placed on the surface of the liquid crystal layer that is in contact with the liquid crystal layer. The liquid crystal molecules are arranged 30 degrees away from the direction in which the liquid crystal molecules are aligned in the twisting direction of the liquid crystal. FIG. 1 is a graph showing the spectral characteristics of the liquid crystal display and the polarization characteristics of the first polarizing plate in this experiment. In the graph in Figure 1, the horizontal and vertical axes are the wavelength and transmittance, respectively, the solid line 1 represents the spectral characteristics of the liquid crystal display in the non-lit state, and the dotted line 2 is the first polarizing plate, perpendicular to the polarization axis. The dashed line in 5 shows the spectral characteristics of the polarizing plate when light biased in the direction parallel to the polarization axis is incident on the first polarizing plate. are shown respectively. The spectral characteristics of the liquid crystal display shown in Figure 1 are from 400% to 700%.
It was shown that the transmittance was almost constant in the visible light region with a wavelength of m, and it was confirmed that it actually appeared to be almost colorless and transparent to the naked eye. Figure 5 is a graph showing the spectral characteristics of the illuminated portion of the liquid crystal display when an electric field is applied to the liquid crystal cell of this experimental system to turn it on, with the horizontal and vertical axes representing wavelength and transmittance, respectively. It is. The spectral characteristics shown in Figure 5 are from 400% m to 50% even in the lit state.
This shows that light in a wavelength range around 0 nm blue is transmitted. Therefore, in the liquid crystal display of this experiment, the illuminated portion is displayed in blue on the almost colorless and transparent display section.
さて、本実験では第一の偏光板として青色偏光板を選択
したが、ここで一般にどのような色系統の偏光板を選択
すれば表示部がほぼ無色透明になるかについて考えてみ
る１本実験の液晶表示体において第一の偏光板を可視領
域の全波長の光に対して充分な偏光能をもつ偏光板でお
きかえると表示部は黄色に見える。このことは黄色の補
色である青色の光が液晶表示体を透過していないことを
意味する。以上のことを一般化すると、液晶表示体の二
枚の偏光板がともに可視領域の全波長の光に対して充分
な偏光能をもつときに見える表示部の色と補色をなす色
系統の偏光板を二枚の偏光板の少くとも一方に用いると
表示部はほぼ無色透明になることが結論できる。もちろ
ん、このような偏光板の選択方法は人間の目による直感
的なものであるから、より正確には偏光板および液晶表
示体の分光特性にもとづいて最終的選択をおこなうこと
が必要である。Now, in this experiment, a blue polarizing plate was selected as the first polarizing plate, but here we will conduct an experiment to consider what kind of color polarizing plate should be selected in general to make the display section almost colorless and transparent. When the first polarizing plate in a liquid crystal display is replaced with a polarizing plate having sufficient polarizing ability for light of all wavelengths in the visible region, the display area appears yellow. This means that blue light, which is a complementary color to yellow, does not pass through the liquid crystal display. Generalizing the above, when the two polarizing plates of the liquid crystal display both have sufficient polarizing ability for light of all wavelengths in the visible range, polarized light of a color system that is complementary to the color of the display area that is visible. It can be concluded that when the plate is used as at least one of the two polarizing plates, the display section becomes almost colorless and transparent. Of course, this method of selecting a polarizing plate is intuitive to the human eye, so it is necessary to make the final selection more accurately based on the spectral characteristics of the polarizing plate and the liquid crystal display.
次に、我々はΔｎ・ｄが１．０μｍであり液晶のねじれ
角が１４０度の液晶セルを用いて第二の実験をおこなっ
た。実験に用いた第一の偏光板と第二の偏光板はそれぞ
れ第一の実験に用いた偏光板と同一のものである。第４
図は本実験における液晶分子配列方向と偏光板の偏光軸
方向３示す図であって、図中の番号はそれぞれ第２図の
番号と対応している。第４図かられかるように、第一の
偏光板と第二の偏光板の偏光軸はそれぞれ隣接する液晶
層表面の液晶分子配列方向から液晶のねじれ方向に４５
度ずらして配置しである。この実験においても、第一の
実験と同様に、はぼ無色透明の表示部に点灯部分が青色
で表示される液晶表示体を得ることができた。Next, we conducted a second experiment using a liquid crystal cell in which Δn·d was 1.0 μm and the twist angle of the liquid crystal was 140 degrees. The first polarizing plate and the second polarizing plate used in the experiment were the same as the polarizing plate used in the first experiment. Fourth
The figure shows the alignment direction of liquid crystal molecules and the polarization axis direction of the polarizing plate 3 in this experiment, and the numbers in the figure correspond to the numbers in FIG. 2, respectively. As can be seen from Figure 4, the polarization axes of the first polarizing plate and the second polarizing plate are 45 degrees in the twist direction of the liquid crystal from the liquid crystal molecule alignment direction on the surface of the adjacent liquid crystal layer.
They are arranged at different degrees. In this experiment, as in the first experiment, it was possible to obtain a liquid crystal display in which the illuminated portion was displayed in blue on a nearly colorless and transparent display section.
さらに、我々はΔｎ−ｄが（Ｌ７５μｍであり液晶のね
じれ角が１２０度の液晶セルを用いて第三の実験をおこ
なった。実験に用いた第一の偏光板と第二の偏光板はそ
れぞれ第一あるいは第二の実験に用いた偏光板と同一の
ものである。第５図は本実験における液晶分子配列方向
と偏光板の偏光軸方向を示す図であって、図中の番号は
それぞれ第２図の番号と対応している。第５図かられか
るように、第一の偏光板の偏光軸は隣接する液晶層表面
の液晶分子配列方向から液晶のねじれ方向に４５度ずら
して配置し、第二の偏光板の偏光軸は隣接する液晶層表
面の液晶分子配列方向から液晶のねじれ方向と反対方向
に４５度ずらして配置しである。この実験においても、
第一あるいは第二の実験と同様に、はぼ無色透明の表示
部に点灯部分が青色で表示される液晶表示体を得ること
ができた。Furthermore, we conducted a third experiment using a liquid crystal cell in which Δn-d was (L75 μm and the twist angle of the liquid crystal was 120 degrees.The first polarizing plate and the second polarizing plate used in the experiment were This is the same polarizing plate used in the first or second experiment. Figure 5 is a diagram showing the alignment direction of liquid crystal molecules and the polarization axis direction of the polarizing plate in this experiment, and the numbers in the figure are the same as those used in the first or second experiment. The numbers correspond to the numbers in Figure 2.As can be seen from Figure 5, the polarization axis of the first polarizing plate is shifted by 45 degrees from the alignment direction of liquid crystal molecules on the surface of the adjacent liquid crystal layer to the twisting direction of the liquid crystal. However, the polarization axis of the second polarizing plate is shifted by 45 degrees from the alignment direction of liquid crystal molecules on the surface of the adjacent liquid crystal layer in the direction opposite to the twisting direction of the liquid crystal.In this experiment as well,
Similar to the first or second experiment, it was possible to obtain a liquid crystal display in which the illuminated portion was displayed in blue on a colorless and transparent display section.
以上の第一、第二および第三の実験で得られた液晶表示
体の時分割駆動特性と視野特性を測定したところ、従来
技術による液晶表示体のそれらとまったく同等であるこ
とが確認された。When we measured the time-division drive characteristics and viewing characteristics of the liquid crystal displays obtained in the first, second, and third experiments above, it was confirmed that they were completely equivalent to those of the liquid crystal display according to the conventional technology. .
以上の第一、第二および第三の実験における分光特性の
評価はすべて透過光を用いておこなわれている。このよ
うな透過光を用いる評価では、第一の偏光板である青色
偏光板から光を入射する場合と反対に第二の偏光板であ
る可視領域の全波長の光に対して充分な偏光能をもつ偏
光板から光を入射する場合とでは結果に差異はない。し
かしこれらの実験で得られた液晶表示体を反射型で用い
る場合には反射板を二枚の偏光板のどちらに隣接して配
置するかによって結果が異なることが判明した。すなわ
ち、白色の反射板？用いる゛場合、反射板と隣接する偏
光板と異なる方の偏光板が青色偏光板であるときには表
示部はほぼ反射板の色である白色に見えるが、反射板と
隣接する偏光板と異なる方の偏光板が可視領域の全波長
の光に対して充分な偏光能をもつ偏光板であるときには
、反射板と隣接する偏光板が青色偏光板であっても表示
部は有色に見える。したがって、第一、第二および第三
の実験で得られた液晶表示体を反射型で用いる場合に良
好な結果を得るためには、反射板と隣接する偏光板と異
なる方の偏光板に青色偏光板を用いることが必要である
。The evaluation of spectral characteristics in the first, second, and third experiments described above were all performed using transmitted light. In evaluations using such transmitted light, in contrast to the case where light is incident from the first polarizing plate, which is a blue polarizing plate, the second polarizing plate has sufficient polarizing ability for light of all wavelengths in the visible region. There is no difference in the results when the light is incident from a polarizing plate with . However, when the liquid crystal display obtained in these experiments is used in a reflective type, it has been found that the results differ depending on which of the two polarizing plates the reflective plate is placed adjacent to. In other words, a white reflector? If the polarizing plate that is different from the reflective plate and the adjacent polarizing plate is a blue polarizing plate, the display part will appear white, which is almost the color of the reflective plate, but if the polarizing plate that is different from the reflective plate and the adjacent polarizing plate is a blue polarizing plate, If the polarizing plate has sufficient polarizing ability for light of all wavelengths in the visible region, the display portion will appear colored even if the polarizing plate adjacent to the reflecting plate is a blue polarizing plate. Therefore, in order to obtain good results when using the liquid crystal displays obtained in the first, second, and third experiments as a reflective type, it is necessary to use a polarizing plate that is different from the one adjacent to the reflective plate. It is necessary to use a polarizing plate.
なお、透過型および反射型の双方において、液晶表示体
の二枚の偏光板の両方に青色偏光板を用いても表示部は
やや青みがかるものの透過型ではほぼ無色透明また白色
反射板を用いた反射型ではほぼ白色になることは言うま
でもない。In addition, in both the transmissive type and the reflective type, even if blue polarizing plates are used for both of the two polarizing plates of the liquid crystal display, the display part will be slightly bluish, but in the transmissive type, it is almost colorless and transparent, or if a white reflective plate is used. Needless to say, the reflective type will be almost white.
以上述べてきたように本発明によれば、液晶のねじれ角
が９０度をこえる液晶表示体において、二枚の偏光板の
少くとも一方に可視領域の全波長の光に対して偏光能を
もつ二枚の偏光板を用いて液晶層をはさむ場合に吸収さ
れる波長領域の光に対しては偏光能をもたない偏光板を
用いることにより、液晶のねじれ角が９０度をこえる液
晶表示体の長所であるすぐれた時分割駆動特性を失うこ
となく表示部の着色をとり除いて、透過型ではほぼ無色
透明また白色反射板を用いる反射型ではほぼ白色の表示
部をもつ液晶表示体を提供することができるという効果
を有する。さらに本発明によれば点灯部分は青色などの
カラー表示であり、したがって本発明は外観品質上ある
いはデザイン上にもすぐれた効果を有するものである。As described above, according to the present invention, in a liquid crystal display in which the twist angle of the liquid crystal exceeds 90 degrees, at least one of the two polarizing plates has a polarizing ability for light of all wavelengths in the visible region. A liquid crystal display in which the twist angle of the liquid crystal exceeds 90 degrees by using polarizing plates that do not have polarizing ability for light in the wavelength range that is absorbed when a liquid crystal layer is sandwiched between two polarizing plates. By removing the coloring of the display area without losing the excellent time-division drive characteristics that are the advantage of the LCD, we provide a liquid crystal display that has an almost colorless and transparent display area in a transmissive type and an almost white display area in a reflective type using a white reflector. It has the effect of being able to. Further, according to the present invention, the lighting portion is displayed in a color such as blue, and therefore, the present invention has excellent effects in terms of appearance quality and design.
杭１ｇ；！Ｊは木部口■におけろ１旧５示休のＪト占灯
壮態の分光特性とそこに用いられる偏光板の偏光特性を
示すグラフ。
第２図は第一の実験における液晶分子配列方向と偏光板
の偏光軸方向を示す図。
第５図は本発明における液晶表示体の点灯部分の分光特
性を示すグラフ。
第４図は第二の実験における液晶分子配列方向と偏光板
の偏光軸方向を示す図。
第５図は第三の実験における液晶分子配列方向と偏光板
の偏光軸方向を示す図。
１・・・・・・液晶表示体の非点灯状態の分光特性。
２・・・・・・偏光板に偏光軸と直交する方向にかたよ
った光を入射したときの偏光板の分光特性。
５・・・・・・偏光板に偏光軸と平行な方向にかたよっ
た光を入射したときの偏光板の分光特性４・・・・・・
第一の偏光板と隣接する液晶層表面の液晶分子の配列方
向
５・・・・・・第二の偏光板と隣接する液晶層表面の液
晶分子の配列方向
６・・・・・・第一の偏光板の偏光軸方向７・・・・・
・第二の偏光板の偏光軸方向以 上
出願人 七イフーエプソン株式会社
代理人 弁理士最上務（他１名）
→ｌ＝、ｃ！片・上丁状脅にのン？ＬＡＡフ尺イｊ艮
〉二偽光、ネ反の分光Ａ午ト生を示す７す７符１図1g stake;! J is a graph showing the spectral characteristics of the 1st and 5th show in the xylem mouth ■ and the polarization characteristics of the polarizing plate used there. FIG. 2 is a diagram showing the alignment direction of liquid crystal molecules and the polarization axis direction of the polarizing plate in the first experiment. FIG. 5 is a graph showing the spectral characteristics of the lit portion of the liquid crystal display according to the present invention. FIG. 4 is a diagram showing the alignment direction of liquid crystal molecules and the polarization axis direction of the polarizing plate in the second experiment. FIG. 5 is a diagram showing the alignment direction of liquid crystal molecules and the polarization axis direction of the polarizing plate in the third experiment. 1... Spectral characteristics of the liquid crystal display in the non-lit state. 2...Spectral characteristics of a polarizing plate when light that is biased in a direction perpendicular to the polarization axis is incident on the polarizing plate. 5...Spectral characteristics of the polarizing plate when light that is biased in the direction parallel to the polarization axis is incident on the polarizing plate 4...
Direction of arrangement of liquid crystal molecules on the surface of the liquid crystal layer adjacent to the first polarizing plate 5 ... Direction of arrangement of liquid crystal molecules on the surface of the liquid crystal layer adjacent to the second polarizing plate 6 ... First Polarization axis direction of polarizing plate 7...
・In the direction of the polarization axis of the second polarizing plate or above Applicant Seven Ifu Epson Co., Ltd. Representative Patent Attorney Mogami (1 other person) →l=, c! Is it a threat to the police? LAA fu shaku ij 艮
〉2 false light, 7th sign 1 diagram showing the spectroscopy A and the positive light
Claims (4)
持され９０度をこえる角度にねじられたらせん構造をも
つ液晶層、該液晶層をはさんで対向する二枚の偏光板か
ら構成される液晶表示体において、二枚の偏光板の少く
とも一方は、可視領域の全波長の光に対して偏光能をも
つ二枚の偏光板を用いて前記液晶層をはさむ場合に吸収
される波長領域の光に対しては偏光能をもたないことを
特徴とする液晶表示体。(1) Two transparent substrates placed opposite each other, a liquid crystal layer supported by the transparent substrates and having a spiral structure twisted at an angle exceeding 90 degrees, and two polarizing plates facing each other with the liquid crystal layer in between. In the constructed liquid crystal display, at least one of the two polarizing plates has the ability to polarize light of all wavelengths in the visible region. A liquid crystal display characterized by having no polarizing ability for light in a wavelength range.
晶のティルト角の平均値をθとしてΔｎ・ｄ、ｃｏｓθ
〜０．８μｍ を満足し、液晶のねじれ角は約２７０度であり、二枚の
偏光板の一方の偏光軸は隣接する液晶層表面の液晶分子
配列方向から液晶のねじれ方向に約６０度、他方の偏光
軸は隣接する液晶層表面の液晶分子配列方向から液晶の
ねじれ方向に約３０度それぞれずれており、前記の二枚
の偏光板の少くとも一方は青色付近を中心とする波長領
域の光に対して偏光能をもたないことを特徴とする特許
請求の範囲第１項記載の液晶表示体。(2) Δn・d, cos θ where the thickness of the liquid crystal layer is d, the refractive anisotropy of the liquid crystal is Δn, and the average value of the tilt angle of the liquid crystal is θ.
~0.8 μm, the twist angle of the liquid crystal is about 270 degrees, and the polarization axis of one of the two polarizing plates is about 60 degrees in the twist direction of the liquid crystal from the alignment direction of liquid crystal molecules on the surface of the adjacent liquid crystal layer. The other polarization axis is shifted by about 30 degrees from the liquid crystal molecular alignment direction on the surface of the adjacent liquid crystal layer in the liquid crystal twist direction, and at least one of the two polarizing plates has a wavelength range centered around blue. The liquid crystal display according to claim 1, which has no polarizing ability for light.
り、液晶のねじれ角は約１４０度であり、二枚の偏光板
の偏光軸はそれぞれ隣接する液晶層表面の液晶分子配列
方向から液晶のねじれ方向に約４５度ずれており、前記
の二枚の偏光板の少くとも一方は青色付近を中心とする
波長領域の光に対して偏光能をもたないことを特徴とす
る特許請求の範囲第１項記載の液晶表示体。(3) Δn・d is in the range of 0.9 μm to 1.1 μm, the twist angle of the liquid crystal is approximately 140 degrees, and the polarization axes of the two polarizing plates are in the direction of liquid crystal molecule alignment on the surface of the adjacent liquid crystal layer. 45 degrees in the twist direction of the liquid crystal, and at least one of the two polarizing plates has no polarizing ability for light in a wavelength range centered around blue. A liquid crystal display according to claim 1.
り、液晶のねじれ角は約１２０度であり、二枚の偏光板
の一方の偏光軸は隣接する液晶層表面の液晶分子配列方
向から液晶のねじれ方向に約４５度、他方の偏光軸は隣
接する液晶層表面の液晶分子配列方向から液晶のねじれ
方向と反対方向に約４５度それぞれずれており、前記の
二枚の偏光板の少くとも一方は青色付近を中心とする波
長領域の光に対して偏光能をもたないことを特徴とする
特許請求の範囲第１項記載の液晶表示体。(4) Δn・d is in the range of 0.6 μm to 0.8 μm, the twist angle of the liquid crystal is approximately 120 degrees, and the polarization axis of one of the two polarizing plates is aligned with the liquid crystal molecules on the surface of the adjacent liquid crystal layer. The other polarization axis is shifted by about 45 degrees from the liquid crystal molecular alignment direction on the surface of the adjacent liquid crystal layer in the opposite direction to the liquid crystal twist direction, and the two polarizing plates 2. The liquid crystal display according to claim 1, wherein at least one of the components has no polarization ability for light in a wavelength region centered around blue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60276488A JPS62134625A (en) | 1985-12-09 | 1985-12-09 | Liquid crystal display body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60276488A JPS62134625A (en) | 1985-12-09 | 1985-12-09 | Liquid crystal display body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62134625A true JPS62134625A (en) | 1987-06-17 |
Family
ID=17570151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60276488A Pending JPS62134625A (en) | 1985-12-09 | 1985-12-09 | Liquid crystal display body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62134625A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62204230A (en) * | 1986-03-04 | 1987-09-08 | Seiko Instr & Electronics Ltd | Liquid crystal display device |
| JPS62218929A (en) * | 1986-03-20 | 1987-09-26 | Asahi Glass Co Ltd | Liquid crystal display element |
| JPS63159828A (en) * | 1986-12-24 | 1988-07-02 | Toshiba Corp | Liquid crystal indicator |
| WO1989003542A1 (en) * | 1987-10-06 | 1989-04-20 | Asahi Glass Company Ltd. | Liquid crystal display device |
| DE3918828A1 (en) * | 1989-06-09 | 1990-12-13 | Licentia Gmbh | Twisted nematic cell type LCD - has greater view angle in larger operating temp. range with less background noise |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6231822A (en) * | 1985-08-02 | 1987-02-10 | Hitachi Ltd | Liquid crystal displaying element |
-
1985
- 1985-12-09 JP JP60276488A patent/JPS62134625A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6231822A (en) * | 1985-08-02 | 1987-02-10 | Hitachi Ltd | Liquid crystal displaying element |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62204230A (en) * | 1986-03-04 | 1987-09-08 | Seiko Instr & Electronics Ltd | Liquid crystal display device |
| JPS62218929A (en) * | 1986-03-20 | 1987-09-26 | Asahi Glass Co Ltd | Liquid crystal display element |
| JPS63159828A (en) * | 1986-12-24 | 1988-07-02 | Toshiba Corp | Liquid crystal indicator |
| WO1989003542A1 (en) * | 1987-10-06 | 1989-04-20 | Asahi Glass Company Ltd. | Liquid crystal display device |
| US5136406A (en) * | 1987-10-06 | 1992-08-04 | Asahi Glass Company Ltd. | Plural layer liquid crystal display device for a high density display |
| DE3918828A1 (en) * | 1989-06-09 | 1990-12-13 | Licentia Gmbh | Twisted nematic cell type LCD - has greater view angle in larger operating temp. range with less background noise |
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