JP2000035579A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JP2000035579A JP2000035579A JP10205111A JP20511198A JP2000035579A JP 2000035579 A JP2000035579 A JP 2000035579A JP 10205111 A JP10205111 A JP 10205111A JP 20511198 A JP20511198 A JP 20511198A JP 2000035579 A JP2000035579 A JP 2000035579A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal display
- substrates
- display device
- pixel
- 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
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は視野角の広いアクテ
ィブマトリクス型液晶表示素子に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal display device having a wide viewing angle.
【0002】[0002]
【従来の技術】液晶表示素子は、薄型で軽量、かつ低消
費電力のディスプレイ素子であり、テレビやビデオなど
の画像表示装置や、ワープロ,パソコンなどのOA機器
に広く用いられている。液晶表示素子のなかでも、アレ
イ基板上に多数のスイッチング素子を配置したアクティ
ブマトリクス型液晶表示素子の大部分は、液晶の配向方
位がほぼ90°捻れたツイストネマチック(TN)モー
ドを表示に用いており、高速応答や高精細が可能なディ
スプレイとして開発が進んでいる。2. Description of the Related Art Liquid crystal display devices are thin, lightweight, and low power consumption display devices, and are widely used in image display devices such as televisions and videos, and OA equipment such as word processors and personal computers. Among the liquid crystal display elements, most of the active matrix type liquid crystal display elements in which a number of switching elements are arranged on an array substrate use a twisted nematic (TN) mode in which the orientation direction of the liquid crystal is twisted by approximately 90 ° for display. Therefore, development as a display capable of high-speed response and high definition is progressing.
【0003】しかしながら、TNモードの液晶表示素子
は、液晶の旋光性を用いて表示しているために、パネル
を見る角度によって色調やコントラストが異なるという
大きな問題点がある。これらの問題点を解決するために
位相差フィルムを用いて補償する方法や、画素内に複数
の異なる配向領域を有する画素分割法や配向分割法等が
用いられている。しかしながら、TNモードではいまだ
に良好な表示が得られる視野角範囲は陰極線管(CR
T)に比べて狭く、CRTと同等以上の表示性能を実現
するには至っていない。However, the TN mode liquid crystal display element has a serious problem that the color tone and contrast are different depending on the angle at which the panel is viewed, since the display is performed using the optical rotation of the liquid crystal. In order to solve these problems, a compensation method using a retardation film, a pixel division method having a plurality of different orientation regions in a pixel, an orientation division method, and the like are used. However, in the TN mode, the viewing angle range in which a good display can still be obtained is a cathode ray tube (CR).
It is narrower than T), and has not yet achieved display performance equal to or higher than that of a CRT.
【0004】よりCRTに近い視野角特性を実現するた
めに、液晶分子を基板面にほぼ水平な方向で動かし、電
界制御複屈折効果により光透過率をコントロールする表
示方式がある。例えば櫛形電極を基板上に形成する方法
がR.A.Sorefによって提案されている(J.Appl.Phys.45,5
446(1974))。この方式によれば、常に液晶分子をほぼ横
(短軸方向)から眺める形となり、見る方向が異なって
も屈折率の差が殆ど無い状態となり、コントラストの視
角依存性を極めて小さくすることが可能となる。In order to achieve a viewing angle characteristic closer to that of a CRT, there is a display system in which liquid crystal molecules are moved in a direction substantially horizontal to the substrate surface, and light transmittance is controlled by an electric field control birefringence effect. For example, a method of forming a comb-shaped electrode on a substrate has been proposed by RASoref (J. Appl. Phys. 45, 5).
446 (1974)). According to this method, the liquid crystal molecules are always viewed almost from the side (shorter axis direction), and there is almost no difference in the refractive index even when the viewing direction is different, so that the viewing angle dependency of the contrast can be extremely reduced. Becomes
【0005】[0005]
【発明が解決しようとする課題】しかしながら、このモ
ードは電圧無印加状態で上下の基板間で液晶分子が平行
に並んでいるホモジニアス配向を用い、さらに、この状
態で黒表示を行うため、上下基板の偏光軸のズレが黒の
沈み込み、すなわちコントラストに影響する。実際にパ
ネルを作製する際には、基板端面と偏光板の端面を基準
にして貼り付けるため、偏光板を貼り付ける際のズレ
に、偏光板を切り出す際のズレも加わり、パネル間のコ
ントラストのばらつきが生じやすいという問題があっ
た。However, this mode uses a homogeneous alignment in which liquid crystal molecules are arranged in parallel between the upper and lower substrates in a state where no voltage is applied, and furthermore, a black display is performed in this state. Shift of the polarization axis of the image influences black sinking, that is, the contrast. When actually manufacturing a panel, since the substrate is pasted on the basis of the end surface of the substrate and the end surface of the polarizing plate, the deviation when attaching the polarizing plate and the deviation when cutting out the polarizing plate are also added, and the contrast between the panels is reduced. There is a problem that variation easily occurs.
【0006】本発明は、このような従来の問題点に鑑み
て、偏光板の貼り角のズレが正面コントラストに影響し
にくく、視野角の広い液晶表示素子を実現することを目
的とする。The present invention has been made in view of the above problems, and it is an object of the present invention to realize a liquid crystal display device having a wide viewing angle, in which a deviation in a sticking angle of a polarizing plate hardly affects front contrast.
【0007】[0007]
【課題を解決するための手段】前記目的を達成するため
の本発明は、一対の基板間に液晶が挟持され、前記基板
の一方に各画素ごとにアクティブ素子が配置され、この
アクティブ素子を有する画素内に少なくとも一対以上の
線状の画素電極と共通電極とが形成され、前記両電極間
に電圧が印加された際に、液晶分子の配列が基板面に対
して水平方向に変化する構成の液晶表示素子であって、
両基板の外側に配置された偏光板の各々の偏光軸を、液
晶分子の配向方向に対して45゜をなす方向を対称軸と
なるように振り分けて配置したことを特徴とする。また
本発明は、前記偏光板の各々の偏光軸の挟角を86゜か
ら94゜の範囲としたことを特徴とする。According to the present invention, there is provided a liquid crystal display device comprising: a liquid crystal sandwiched between a pair of substrates; an active element for each pixel disposed on one of the substrates; At least one or more linear pixel electrodes and a common electrode are formed in a pixel, and when a voltage is applied between the two electrodes, the arrangement of liquid crystal molecules changes in the horizontal direction with respect to the substrate surface. A liquid crystal display element,
It is characterized in that the polarizing axes of the polarizing plates arranged outside the two substrates are arranged so that the direction of 45 ° with respect to the alignment direction of the liquid crystal molecules becomes the axis of symmetry. Further, the invention is characterized in that the included angle of each polarizing axis of the polarizing plate is in the range of 86 ° to 94 °.
【0008】このように偏光軸を液晶分子の配向方向に
対して45゜の方向が対称軸となるように偏光板を配置
することにより、入射側偏光板の偏光軸あるいは吸収軸
が液晶分子の配向方向とズレを生じていた場合でも、出
射側の偏光板の配置がこのズレを補償する方向に作用す
るため、コントラストの低下を防ぐことが可能となる。By arranging the polarizing plate such that the polarization axis is symmetrical at 45 ° with respect to the alignment direction of the liquid crystal molecules, the polarization axis or the absorption axis of the incident side polarizing plate is adjusted to the direction of the liquid crystal molecules. Even when the alignment direction is shifted, the arrangement of the polarizing plate on the emission side acts in a direction to compensate for the shift, so that it is possible to prevent a decrease in contrast.
【0009】[0009]
【発明の実施の形態】図1は本発明の一実施形態におけ
る液晶表示素子の構成を示す斜視図、図2は本発明の一
実施形態における液晶表示素子における薄膜トランジス
タ(TFT)アレイ基板のTFT画素部の概略構成を示
す平面図である。FIG. 1 is a perspective view showing the structure of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a TFT pixel of a thin film transistor (TFT) array substrate in the liquid crystal display device according to an embodiment of the present invention. It is a top view which shows the schematic structure of a part.
【0010】図1に示すように、本実施の形態の液晶表
示素子は、アレイ基板1と、アレイ基板1に対向して配
置された対向基板2と、アレイ基板1と対向基板2にお
けるそれぞれの対向面に形成された配向膜3a,3b
と、アレイ基板1と対向基板2間に挟持された液晶層4
と、アレイ基板1および対向基板2の外部にそれぞれ配
置された偏光板5a,5bとを具備している。As shown in FIG. 1, a liquid crystal display device according to the present embodiment includes an array substrate 1, an opposing substrate 2 arranged opposite to the array substrate 1, and respective ones of the array substrate 1 and the opposing substrate 2. Alignment films 3a, 3b formed on opposing surfaces
And a liquid crystal layer 4 sandwiched between an array substrate 1 and a counter substrate 2.
And polarizing plates 5a and 5b disposed outside the array substrate 1 and the counter substrate 2, respectively.
【0011】図2に示すように、アレイ基板1は、マト
リクス状に配置された複数の信号電極配線6と複数の走
査電極配線7と、各画素内にその交差点に対応して設け
られたスイッチング素子として機能する少なくとも1つ
のTFT素子8と、このTFT素子8に接続された櫛形
状の画素電極配線9と、この画素電極配線9と咬合する
ように形成された櫛形状の共通電極配線10とを有して
いる。なお、本実施形態においては画素電極配線9と共
通電極配線10とはそれぞれ幅を5μm、間隔を12μ
mに保つように形成されている。As shown in FIG. 2, an array substrate 1 includes a plurality of signal electrode wirings 6 and a plurality of scanning electrode wirings 7 arranged in a matrix, and a switching circuit provided in each pixel corresponding to an intersection thereof. At least one TFT element 8 functioning as an element, a comb-shaped pixel electrode wiring 9 connected to the TFT element 8, and a comb-shaped common electrode wiring 10 formed to engage with the pixel electrode wiring 9. have. In this embodiment, each of the pixel electrode wiring 9 and the common electrode wiring 10 has a width of 5 μm and an interval of 12 μm.
m.
【0012】本実施形態においてアレイ基板1上には、
固形分濃度4%のポリイミドワニスをオフセット印刷
し、220℃で1時間加熱することにより配向膜3aが
形成される。この配向膜3aの膜厚は約600Åであ
る。そして、この配向膜3aを画素電極配線9および共
通電極配線10と平行な方向から10゜傾いた方向にレ
ーヨン布でラビングすることにより、液晶分子4aはこ
のラビング方向に配向する。In this embodiment, on the array substrate 1,
An alignment film 3a is formed by offset printing of a polyimide varnish having a solid content of 4% and heating at 220 ° C. for 1 hour. The thickness of the alignment film 3a is about 600 °. The liquid crystal molecules 4a are aligned in the rubbing direction by rubbing the alignment film 3a with a rayon cloth in a direction inclined by 10 ° from a direction parallel to the pixel electrode wiring 9 and the common electrode wiring 10.
【0013】このアレイ基板1を当該アレイ基板1と同
様にして配向膜3bが形成されている対向基板2に対し
て、液晶分子4aの配向方位が同じになるようにスペー
サ(図示せず)として3μmのビーズを介して貼り合わ
せる。The array substrate 1 is used as a spacer (not shown) so that the orientation direction of the liquid crystal molecules 4a is the same as that of the array substrate 1 with respect to the counter substrate 2 on which the alignment film 3b is formed. Laminate via 3 μm beads.
【0014】このパネルに屈折率異方性Δnが0.09
0で誘電率異方性Δεが正のネマチック液晶を真空注入
法にて封入する。This panel has a refractive index anisotropy Δn of 0.09.
A nematic liquid crystal having a dielectric anisotropy Δε of 0 and positive is enclosed by a vacuum injection method.
【0015】以上のようにして作製された液晶パネルの
両側に偏光板5a,5bをラビング方向(液晶分子の配
向方向)に対して45゜の方向Aを基準に(表1)のよ
うに8通りの組み合わせで貼り付け、ノーマリーブラッ
クモードの液晶表示素子A〜Hを得た。各液晶表示素子
を駆動しコントラストを測定した結果を(表1)に示
す。The polarizing plates 5a and 5b are provided on both sides of the liquid crystal panel manufactured as described above with reference to a direction A of 45 ° with respect to the rubbing direction (the orientation direction of liquid crystal molecules) as shown in Table 1 (Table 1). The liquid crystal display devices A to H of normally black mode were obtained by pasting in the same combinations. The results of driving each liquid crystal display element and measuring the contrast are shown in (Table 1).
【0016】[0016]
【表1】 [Table 1]
【0017】(表1)に示すように、液晶分子の配向方
向と偏光板の偏光軸の貼り合わせのズレがあっても、反
対側の基板のズレが液晶分子の配向方向から45゜の方
向を対称軸として同じ角度のズレがあった場合、コント
ラストの低下を非常に小さくすることができる。特に、
ラビング方向に対して45゜をなす方向と偏光板の偏光
軸とのズレ角が各々2゜以内とすることでコントラスト
の低下がほとんどない液晶表示素子が得られた。As shown in Table 1, even if there is a misalignment between the alignment direction of the liquid crystal molecules and the polarization axis of the polarizing plate, the misalignment of the opposite substrate is 45 ° from the alignment direction of the liquid crystal molecules. When there is a deviation of the same angle with respect to the symmetry axis, the decrease in contrast can be extremely reduced. In particular,
A liquid crystal display element with almost no decrease in contrast was obtained by setting the deviation angle between the direction forming 45 ° with the rubbing direction and the polarization axis of the polarizing plate within 2 °.
【0018】[0018]
【発明の効果】以上のように本発明によれば、各基板に
貼り付ける偏光板の偏光軸が液晶分子の配向方向に対し
て45゜をなす方向を対称軸となるように振り分けるこ
とで、貼り角のズレがコントラストに影響しにくく、実
際のパネル製造の際には、偏光板を切り出す際の軸ズレ
および貼り付け角度ズレの公差を大きくすることがで
き、作りやすい液晶表示素子となる。As described above, according to the present invention, the direction in which the polarization axis of the polarizing plate attached to each substrate is at an angle of 45 ° with respect to the alignment direction of the liquid crystal molecules becomes a symmetric axis. The deviation of the sticking angle hardly affects the contrast, and in actual manufacturing of the panel, the tolerance of the axis deviation and the sticking angle deviation at the time of cutting out the polarizing plate can be increased, and the liquid crystal display element can be easily manufactured.
【図1】本発明の液晶表示素子の実施形態の構成を示す
斜視図FIG. 1 is a perspective view showing a configuration of an embodiment of a liquid crystal display element of the present invention.
【図2】本発明の実施形態を説明するための液晶表示素
子における薄膜トランジスタアレイ基板のTFT画素部
の概略構成を示す平面図FIG. 2 is a plan view showing a schematic configuration of a TFT pixel portion of a thin film transistor array substrate in a liquid crystal display device for describing an embodiment of the present invention.
1 アレイ基板 2 対向基板 3a,3b 配向膜 4 液晶層 4a 液晶分子 5a,5b 偏光板 6 信号電極配線 7 走査電極配線 8 TFT素子 9 画素電極配線 10 共通電極配線 11 蓄積容量部 DESCRIPTION OF SYMBOLS 1 Array substrate 2 Counter substrate 3a, 3b Alignment film 4 Liquid crystal layer 4a Liquid crystal molecule 5a, 5b Polarizer 6 Signal electrode wiring 7 Scanning electrode wiring 8 TFT element 9 Pixel electrode wiring 10 Common electrode wiring 11 Storage capacitance part
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 2H090 HB08Y KA05 LA02 LA04 MB03 2H091 FA08X FA08Z FD08 FD09 GA08 GA13 HA07 LA17 LA19 5C094 AA06 AA12 BA03 BA43 CA19 EA04 EA07 ED14 FA03 JA09 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H090 HB08Y KA05 LA02 LA04 MB03 2H091 FA08X FA08Z FD08 FD09 GA08 GA13 HA07 LA17 LA19 5C094 AA06 AA12 BA03 BA43 CA19 EA04 EA07 ED14 FA03 JA09
Claims (2)
板の一方に各画素ごとにアクティブ素子が配置され、こ
のアクティブ素子を有する画素内に少なくとも一対以上
の線状の画素電極と共通電極とが形成され、前記両電極
間に電圧が印加された際に、液晶分子の配列が基板面に
対して水平方向に変化する構成の液晶表示素子であっ
て、両基板の外側に配置された偏光板の各々の偏光軸
を、液晶分子の配向方向に対して45゜をなす方向を対
称軸となるように振り分けて配置したことを特徴とする
液晶表示素子。1. A liquid crystal is sandwiched between a pair of substrates, an active element is arranged for each pixel on one of the substrates, and at least one pair or more of a linear pixel electrode and a common electrode are provided in a pixel having the active element. Are formed, and when a voltage is applied between the two electrodes, the liquid crystal display element has a configuration in which the arrangement of liquid crystal molecules changes in the horizontal direction with respect to the substrate surface, and is disposed outside the two substrates. A liquid crystal display device, wherein each polarization axis of a polarizing plate is arranged so that a direction forming 45 ° with respect to the alignment direction of liquid crystal molecules becomes a symmetric axis.
゜から94゜の範囲としたことを特徴とする請求項1記
載の液晶表示素子。2. The polarizing plate according to claim 1, wherein the included angle of the polarizing axis is 86.
2. The liquid crystal display device according to claim 1, wherein the angle is in the range of {-94}.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10205111A JP2000035579A (en) | 1998-07-21 | 1998-07-21 | Liquid crystal display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10205111A JP2000035579A (en) | 1998-07-21 | 1998-07-21 | Liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000035579A true JP2000035579A (en) | 2000-02-02 |
Family
ID=16501614
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10205111A Pending JP2000035579A (en) | 1998-07-21 | 1998-07-21 | Liquid crystal display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000035579A (en) |
-
1998
- 1998-07-21 JP JP10205111A patent/JP2000035579A/en active Pending
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