JPS62229225A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPS62229225A JPS62229225A JP61073238A JP7323886A JPS62229225A JP S62229225 A JPS62229225 A JP S62229225A JP 61073238 A JP61073238 A JP 61073238A JP 7323886 A JP7323886 A JP 7323886A JP S62229225 A JPS62229225 A JP S62229225A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- display element
- degrees
- polarizing plate
- 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 43
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims abstract description 7
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 18
- 230000000694 effects Effects 0.000 description 10
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 239000013543 active substance Substances 0.000 description 2
- 125000005036 alkoxyphenyl group Chemical group 0.000 description 2
- 235000010290 biphenyl Nutrition 0.000 description 2
- 239000004305 biphenyl Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 101100273797 Caenorhabditis elegans pct-1 gene Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、画像表示装置、コンピュータ端末などに用い
られる大型、大容量フラットディスプレイとして利用さ
れる液晶表示素子に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid crystal display element used as a large-sized, large-capacity flat display used in image display devices, computer terminals, and the like.
（発明の概要）
本発明は、画像表示装置、コンピュータ端末などに用い
られる大型、人容准フラットディスプレイとして利用さ
れる液晶表示素子に関し、二枚の電極基板間に挟持され
たネマチック液晶のらＵｏんん構造のねじれらせん角が
１５０度から３００度の範囲内にある液晶表示素子に於
て、一対の偏光板のうちの−・方に、波長により偏光度
の異なる偏光板を用いることにより、画面内の色相の差
を少なくし、表示品質を著しく向上せしめるものである
。(Summary of the Invention) The present invention relates to a liquid crystal display element used as a large, human-sized flat display used in image display devices, computer terminals, etc. In a liquid crystal display element whose twisted helical angle is in the range of 150 degrees to 300 degrees, by using a polarizing plate with a different degree of polarization depending on the wavelength as one of the pair of polarizing plates, This reduces the difference in hue within the screen and significantly improves display quality.
（従来の技術）
近来、液晶表示素子は大型化、大官Ｍ化が進んでおり、
特にネマチック液晶のねじれらせん角度を従来のツイス
テッドネマヂック型液晶表示素子よりも大きくし、偏光
板の吸収軸あるいは透過軸と隣接する電極基板の液晶分
子配列方向とが２０度から７０度の範囲内の角度を有す
るようにして、複屈折効果（Ｒ，Ａ、５ｏｒｃｒ ａｎ
ｄ Ｈ，Ｊ、Ｒａｆｕｓｅ、 Ｊ、ＡＤＤＩｐｈｙｓ、
４３．２０２９ （１９７２））を利用した液晶表示素
子の利用により、画素数６００ｘ４００ドツト以上の大
容量ディスプレイが実用化されている。ところが、これ
ら複屈折効果を利用した液晶表示素子は、セル厚の均一
度に対する色相の変化が極めて大きく、製造上の困難を
招き、表示品質の著しい低下があった。(Prior art) In recent years, liquid crystal display elements have become larger and more compact.
In particular, the twisted helix angle of the nematic liquid crystal is made larger than that of conventional twisted nematic type liquid crystal display elements, so that the absorption axis or transmission axis of the polarizing plate and the liquid crystal molecule alignment direction of the adjacent electrode substrate are within the range of 20 degrees to 70 degrees. The birefringence effect (R, A, 5orcr an
d H, J, Rafuse, J, ADDIphys,
43.2029 (1972)), a large-capacity display with a pixel count of 600 x 400 dots or more has been put into practical use. However, these liquid crystal display elements that utilize the birefringence effect have extremely large changes in hue with respect to the uniformity of cell thickness, leading to manufacturing difficulties and significant deterioration in display quality.
（発明が解決しようどする問題点）
本発明は、大型、大容量、大画面の、液晶分子のらせん
構造のねじれらせん角度が１５０度から３００度の範囲
内にある電界制御複屈折効果を利用した液晶表示素子に
おける、画面内の色相の差による表示品質の低下を防止
せんとするものである。(Problems to be Solved by the Invention) The present invention utilizes the electric field controlled birefringence effect of a helical structure of liquid crystal molecules in which the twisted helical angle is within the range of 150 degrees to 300 degrees for large size, large capacity, and large screens. This is intended to prevent deterioration in display quality due to differences in hue within the screen in liquid crystal display elements.
（問題点を解決するための手段）
そこで、本発明は、第１図に示すように大型、大容量、
大画面の、液晶分子のらせん構造のねじれら「／ν角度
が１５０１１！ｊ’から３００度の範囲内にある電界制
御複屈折効果を利用した液晶表示素子に於て、一対の偏
光板のうちの一方を、波長により偏光度の異なる偏光板
を用いることにより、画面内の色相の差を少なくし、表
示品質の高い液晶表示素子を提供するものである。(Means for Solving the Problems) Therefore, as shown in FIG.
In a large-screen liquid crystal display device that utilizes the electric field-controlled birefringence effect, where the twist of the helical structure of the liquid crystal molecules is within the range of 15011!j' to 300 degrees, one of the polarizing plates is By using a polarizing plate having a different degree of polarization depending on the wavelength, the difference in hue within the screen is reduced, thereby providing a liquid crystal display element with high display quality.
（作用）
液晶分子のらせん構造のねじれらせん角度が１５０度か
ら３００度の範囲内にある複屈折効果利用型の液晶表示
素子は、従来のツィステッドネマチック型液晶表示素子
に比べて、そのねじれらせん構造のらせん角度が大きい
ため、電圧に対する立上り特性が急峻となり、コントラ
ストが向上するため、大容量、多分割の表示素子として
利用されつるようになったが、偏光板の吸収軸あるいは
透過軸と隣接する電極基板の液晶配列方向が２０度から
７０度の範囲の角度をとるようにして、複屈折効果を利
用しているため、セル厚の均一度に対する色相の変化が
極めて大きく、表示品質の低下を招いていた。そこで、
本発明は、セル厚の変化による電圧無印加時の色相の差
は、特定の波長域の光の透過率の差に起因することに着
目し、前記の特定の波長域に於いては、偏光性を有しな
い偏光板を用いることにより、セル厚の不均一による色
相の差を少なくし、表示品質を向上せしめるものである
。(Function) The birefringence effect type liquid crystal display element, in which the twisted helix angle of the helical structure of the liquid crystal molecules is within the range of 150 degrees to 300 degrees, has a higher twist angle than the conventional twisted nematic type liquid crystal display element. Because the helical angle of the structure is large, the voltage rise characteristic becomes steep and the contrast improves, so it has come to be used as a large-capacity, multi-segment display element. Since the liquid crystal alignment direction of the electrode substrate is set at an angle in the range of 20 degrees to 70 degrees to utilize the birefringence effect, the change in hue with respect to the uniformity of cell thickness is extremely large, resulting in a decrease in display quality. was inviting. Therefore,
The present invention focuses on the fact that the difference in hue when no voltage is applied due to a change in cell thickness is caused by a difference in transmittance of light in a specific wavelength range. By using a polarizing plate that has no polarizing properties, differences in hue due to non-uniform cell thickness can be reduced and display quality can be improved.
（実施例） 次に図面を用いて本発明の実施例を詳細に説明する。(Example) Next, embodiments of the present invention will be described in detail using the drawings.
まず、第１図に示すようなセルを作成した。ここで、１
１ａ、１１ｂはガラス基板、１２ａ、１２ｂは透明電橋
、１３ａ、１３ｂは配向膜、１４は液晶分子、１６ａ、
１６ｂは配向方向を示している。１８ｂは通常の偏光板
である。液晶分子のらせん構造のなずねじれらせん角１
５は、１８０度とした。封入した液晶１７は、ＰＣＨ系
、ビフェニル系、１−トランスアルキルジシクロヘキシ
ル４−ｎアルコキシフェニル、及び４−ｎアルコキシフ
ェニルカルボン
ルシクロヘキシル液晶を主成分とするネマヂツク液晶混
合物に、旋光性物質としてＨＯｒＣｋ社製Ｓ−８１１を
加えたものを用いた。このセルに、２枚の偏光板を、透
過軸が液晶分子の配列方向に４５度の角度をもたせて互
いに平行に設置した。First, a cell as shown in FIG. 1 was created. Here, 1
1a and 11b are glass substrates, 12a and 12b are transparent electric bridges, 13a and 13b are alignment films, 14 is liquid crystal molecules, 16a,
16b indicates the orientation direction. 18b is a normal polarizing plate. Nazu twist helix angle of helical structure of liquid crystal molecules 1
5 was set at 180 degrees. The sealed liquid crystal 17 is a nematic liquid crystal mixture whose main components are PCH-based, biphenyl-based, 1-transalkyldicyclohexyl 4-n alkoxyphenyl, and 4-n alkoxyphenylcarbonylcyclohexyl liquid crystals, and an optically active substance manufactured by HOrCk. The one containing S-811 was used. In this cell, two polarizing plates were placed parallel to each other with their transmission axes making an angle of 45 degrees to the alignment direction of liquid crystal molecules.
上記の液晶表示素子の、電圧無印加時のある点の分光特
性を測定したところ、（第２図）のようであった。この
場合、素子は黄緑色に帯色していることが分る。測定に
はキャノン社製輝度計ＬＣ−ＳＰ型を用いた。When the spectral characteristics of the above liquid crystal display element were measured at a certain point when no voltage was applied, they were as shown in FIG. 2. In this case, it can be seen that the element has a yellow-green color. A Canon luminance meter LC-SP model was used for the measurement.
さらに、この素子の同一面内のセル厚の分布を各点で測
定し、セル厚が前記測定点よりも０．２趨大きい点で分
光特性を測定したところ、（第３図）のようであった。Furthermore, we measured the distribution of cell thickness within the same plane of this element at each point, and measured the spectral characteristics at points where the cell thickness was 0.2 points larger than the measurement point, as shown in Figure 3. there were.
上記２点間の色差を計算すると、ΔＥａｂ“＝１７、５
５であった。Calculating the color difference between the two points above, ΔEab"=17, 5
It was 5.
このように、複屈折効果を利用した液晶表示素子に於て
は、セル厚の差により、色相が大きく変化し、面内でセ
ル厚の不均一があると、表示品質が著しく低下する。As described above, in a liquid crystal display element that utilizes the birefringence effect, the hue changes greatly due to a difference in cell thickness, and if there is non-uniformity in the cell thickness within the plane, the display quality will be significantly degraded.
そこで、観察者側の偏光板１８ａを約５ ０ ０ ｎｍ
以下の波長の光に対してのみ偏光性をもつ偏光板に変更
し、前記２点の観察点につき分光特性を調べた。すると
ΔＥａｂ” ＝８．４８となった。Therefore, the polarizing plate 18a on the observer side has a thickness of about 500 nm.
The polarizing plate was changed to one that has polarizing properties only for light of the following wavelengths, and the spectral characteristics were investigated at the two observation points. Then, ΔEab”=8.48.
上記の結果より、本発明によって、面内にセル厚の不均
一があるセルに於ても、色相の差が小さく抑えられ、表
示素子としての品質が著しく向上したことが分る。The above results show that the present invention suppresses the difference in hue to a small level even in cells with non-uniform cell thickness within the plane, and significantly improves the quality of the display element.
次に、液晶分子のらせん構造のなすねじれらせん角が２
１０度の液晶セルを作成した。封入した液晶は、Ｐｃｔ
−１系、ビフェニル系、１−トランスアルキルジシクロ
ヘキシル４−ｎアルコキシフェニル、及び４−ｎアルコ
キシフェニルカルボン酸４′−トランスｎアルキルシク
ロヘキシル液晶を主成分とするネマチック液晶混合物に
、旋光性物質としてｏｅｒｃｋ社！ＦＪＳ−８１１を加
えたものを用いた。このセルに、２枚の偏光板を、透過
軸が液晶分子の配列方向から、同じ方向に４５°ずれた
ように設置した液晶表示セルを作成した。そのうち、入
射側の偏光板を、約５００ ｎｌａ以下の光に対しての
み偏光性を有するものとした。Next, the twist helix angle formed by the helical structure of the liquid crystal molecules is 2
A 10 degree liquid crystal cell was created. The sealed liquid crystal is Pct
-1 type, biphenyl type, 1-trans alkyl dicyclohexyl 4-n alkoxyphenyl, and 4-n alkoxyphenylcarboxylic acid 4'-trans n alkylcyclohexyl liquid crystal mixture as main components, Oerck Co., Ltd. as an optically active substance. ! The one containing FJS-811 was used. A liquid crystal display cell was fabricated in which two polarizing plates were installed in this cell so that the transmission axes were shifted by 45 degrees in the same direction from the alignment direction of the liquid crystal molecules. Among them, the polarizing plate on the incident side was made to have polarizing properties only for light of about 500 nla or less.
ここで、実施例１と同様に、セル厚の差が０．２趨であ
るような同一セル内の２点の分光特性を測定し、色差を
針筒したところ、ΔＥａｂ ” ＝ ８．ｉ６となった
。Here, as in Example 1, when we measured the spectral characteristics at two points in the same cell where the difference in cell thickness was on the order of 0.2, and calculated the color difference, we found that ΔEab'' = 8.i6. became.
よって、偏光性が波長域によって異なる偏光板を、観察
者からみてセルの裏面に設置しても、実施例１と同様の
効果がえられることがわかった。Therefore, it was found that the same effect as in Example 1 can be obtained even if a polarizing plate whose polarization property differs depending on the wavelength range is placed on the back surface of the cell as viewed from the observer.
（発明の効果）
以上説明したように、本発明によれば、セル厚の不均一
による同一面内の色相の差を小さくし、表示品質の高い
大型１．大容量、大画面の複屈折効果利用型液晶表示素
子を提供することができる。(Effects of the Invention) As explained above, according to the present invention, the difference in hue within the same plane due to non-uniform cell thickness is reduced, and a large-sized display device with high display quality. A liquid crystal display element utilizing birefringence effect with a large capacity and a large screen can be provided.
第１図は本発明の液晶表示素子の構成を示す斜視断面図
、第２図、第３図は、波長と透過率の関係を示すグラフ
である。
１１ａ、１１ｂ・・・ガラス基板
１２ａ、１２１）＝透明１！極
１３ａ、１３ｂ・・・配向膜
１４・・・液晶分子
１５・・・ねじれらせん構造
１６ａ、１６ｂ・・・液晶分子の配列方向１７・・・液
晶層
１８ａ・・・カラー偏光板
１８ｂ・・・偏光板
（他１名２
液晶表承伏五内講Ａ）承オ〆斗視何面図第１図FIG. 1 is a perspective sectional view showing the structure of a liquid crystal display element of the present invention, and FIGS. 2 and 3 are graphs showing the relationship between wavelength and transmittance. 11a, 11b...Glass substrate 12a, 121) = Transparent 1! Poles 13a, 13b...Alignment film 14...Liquid crystal molecules 15...Twisted spiral structure 16a, 16b...Orientation direction of liquid crystal molecules 17...Liquid crystal layer 18a...Color polarizing plate 18b... Polarizing plate (1 other person 2 liquid crystal display diagram) Diagram 1
Claims (2)
、その厚さ方向に１５０度から３００度の範囲内のねじ
れたらせん構造を形成し、かつこのらせん構造を挟んで
一対の偏光板を設置し、この偏光板の吸収軸あるいは透
過軸と隣接する電極基板の液晶分子配列方向とが２０度
から７０度の範囲内の角度を有する液晶表示素子に於て
、一対の偏光板のうちの一方が、波長により偏光度が異
なる偏光板であることを特徴とする液晶表示素子。(1) A nematic liquid crystal is sandwiched between two electrode substrates, forming a twisted spiral structure within the range of 150 degrees to 300 degrees in the thickness direction, and a pair of polarizing plates are sandwiched between this spiral structure. In a liquid crystal display element in which the absorption axis or transmission axis of this polarizing plate and the liquid crystal molecule alignment direction of the adjacent electrode substrate are at an angle within the range of 20 degrees to 70 degrees, one of the pair of polarizing plates is A liquid crystal display element, wherein one of the elements is a polarizing plate whose degree of polarization differs depending on the wavelength.
５５０ｎｍ以下の光に対してのみ偏光性を有することを
特徴とする特許請求の範囲第１項記載の液晶表示素子。(2) The liquid crystal display element according to claim 1, wherein the polarizing plate having a different degree of polarization depending on the wavelength has polarization property only for light having a wavelength of about 550 nm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61073238A JPS62229225A (en) | 1986-03-31 | 1986-03-31 | Liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61073238A JPS62229225A (en) | 1986-03-31 | 1986-03-31 | Liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62229225A true JPS62229225A (en) | 1987-10-08 |
Family
ID=13512400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61073238A Pending JPS62229225A (en) | 1986-03-31 | 1986-03-31 | Liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62229225A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63159828A (en) * | 1986-12-24 | 1988-07-02 | Toshiba Corp | Liquid crystal indicator |
| US7355663B2 (en) * | 2000-10-26 | 2008-04-08 | Nitto Denko Corporation | Polarizing plate and liquid crystal display using the same |
-
1986
- 1986-03-31 JP JP61073238A patent/JPS62229225A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63159828A (en) * | 1986-12-24 | 1988-07-02 | Toshiba Corp | Liquid crystal indicator |
| US7355663B2 (en) * | 2000-10-26 | 2008-04-08 | Nitto Denko Corporation | Polarizing plate and liquid crystal display using the same |
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