JPS63266427A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPS63266427A JPS63266427A JP10131987A JP10131987A JPS63266427A JP S63266427 A JPS63266427 A JP S63266427A JP 10131987 A JP10131987 A JP 10131987A JP 10131987 A JP10131987 A JP 10131987A JP S63266427 A JPS63266427 A JP S63266427A
- Authority
- JP
- Japan
- Prior art keywords
- display
- electrode
- liquid crystal
- substrate
- dummy electrode
- 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 description 30
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
肢五分互
本発明は、プラスチックフィルム基板を用いたドツトマ
トリクス型の液晶表示素子に関し、特に大面積かつハイ
デユーティ駆動による液晶表示素子に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dot matrix type liquid crystal display device using a plastic film substrate, and particularly to a liquid crystal display device with a large area and high duty driving.
従来技亙
プラスチックフィルムを基板とする液晶表示素子におい
て、大面積かつハイデユーティパネルではITO電極の
抵抗が高いと駆動信号が減衰してしまい、コントラスト
に色ムラが発生する。In a conventional liquid crystal display device using a plastic film as a substrate, in a large-area, high-duty panel, if the resistance of the ITO electrode is high, the drive signal will be attenuated, causing color unevenness in contrast.
しかし、プラスチック基板の場合にはITO膜形成時の
基板加熱温度に制約があり、低温スパッタ法でプラスチ
ック基板上に形成されたITOの抵抗は膜厚200人で
約200Ω/口である。However, in the case of a plastic substrate, there are restrictions on the substrate heating temperature when forming an ITO film, and the resistance of ITO formed on a plastic substrate by a low-temperature sputtering method is about 200 Ω/mouth at a film thickness of 200 mm.
一方、ハイデユーティパネル(例えば表示面積240
X 150mm、640 X 400dots)では、
60Ω/ロ以下のITO電極が要求されることから、I
TOの膜厚として1000Å以上が必要となる。On the other hand, high-duty panels (e.g. display area 240
x 150mm, 640 x 400dots),
Since an ITO electrode with a resistance of 60 Ω/Ω or less is required, I
The thickness of TO is required to be 1000 Å or more.
しかし、ITO電極の膜厚が厚くなると、表示電極形成
部と非形成部、特に表示電極とシール部との間に色ムラ
が生じ、これは5TN(Super Twisted
Nematic)型液晶表示素子において顕著である。However, when the film thickness of the ITO electrode increases, color unevenness occurs between the display electrode forming area and the non-forming area, especially between the display electrode and the sealing area, which is caused by 5TN (Super Twisted
This is noticeable in nematic type liquid crystal display elements.
STN型液晶表示素子は、電極を有する一対の基板間に
正の誘電異方性を有する液晶分子が電圧非印加時に基板
に対して略水平配向するように所定間隔(液晶層厚)を
もって挾持され、開基板間で液晶分子が液晶層の厚さ方
向にねじれ構造をとるように構成されたものであって、
ねじれ角が通常のTN素子よりも大きく、例えば180
度以上、好ましくは180〜250度の素子である。こ
の素子は両側に偏光子を配置して使用される。STN型
液晶表示素子は、複屈折による着色を利用して表示を行
なうため、特にセルギャップの制御が重要である。An STN type liquid crystal display element is a pair of substrates having electrodes, which are sandwiched at a predetermined interval (liquid crystal layer thickness) so that liquid crystal molecules having positive dielectric anisotropy are aligned approximately horizontally with respect to the substrates when no voltage is applied. , the liquid crystal molecules are configured to have a twisted structure in the thickness direction of the liquid crystal layer between the open substrates,
The twist angle is larger than a normal TN element, for example 180
degree or more, preferably 180 to 250 degrees. This element is used with polarizers placed on both sides. Since STN type liquid crystal display elements perform display using coloring due to birefringence, control of the cell gap is particularly important.
第3図は従来のSTN型液晶表示素子の構成例を示す平
面図であり、第4図はそのA部の拡大図である。プラス
チックフィルムからなる上基板11と下基板21とが外
周をシール部15によりシールされて離間、対向されて
おり、この間隙部に液晶が封入されている。また、基板
間にはセルギャップを均一に保つために、ビーズ状のギ
ャップ剤が散布されている。上基板11.下基板21に
は、ITOからなる表示電極12.23が形成され、両
基板の表示電極13.23が交差する領域が表示部19
となる。なお、表示電極13.23はその両側部のみを
示し、中間部は省略しである。FIG. 3 is a plan view showing a configuration example of a conventional STN type liquid crystal display element, and FIG. 4 is an enlarged view of section A thereof. An upper substrate 11 and a lower substrate 21 made of plastic film are separated and faced to each other with their outer peripheries sealed by a seal portion 15, and a liquid crystal is sealed in this gap. Furthermore, bead-shaped gap agents are sprinkled between the substrates in order to maintain a uniform cell gap. Upper substrate 11. Display electrodes 12.23 made of ITO are formed on the lower substrate 21, and the area where the display electrodes 13.23 of both substrates intersect is the display section 19.
becomes. Note that the display electrodes 13 and 23 are shown only on both sides thereof, and the middle portion is omitted.
両基板11.21としてポリエチレンテレフタレート(
PET)フィルムを用い、膜厚1000人のITO電極
を形成し、表示面積240 X 150mm、640
X 400dotsの200@ツイストSTN型液晶表
示素子を作成すると、図中29(X X X・・・)で
示した表示部とシール部との間に色ムラが発生する。Both substrates 11.21 are made of polyethylene terephthalate (
PET) film was used to form an ITO electrode with a film thickness of 1000 mm, display area 240 x 150 mm, 640 mm
When a 200@twist STN type liquid crystal display element with X 400 dots is manufactured, color unevenness occurs between the display portion and the seal portion indicated by 29 (X X X . . . ) in the figure.
これは ■その部分の段差。this is ■The difference in level in that area.
■ITO面とPET面での液晶の表面張力の差。■Difference in surface tension of liquid crystal between ITO and PET surfaces.
■ギャップ剤の集中、
などの理由が考えられ、単独あるいは相乗効果で発生す
ることが考えられる。Possible reasons include concentration of gap agents, and it is thought that this may occur singly or as a synergistic effect.
見豆立l汐
本発明は、プラスチックフィルム基板液晶表示素子にお
いて、色ムラの発生を防止し、コントラスト化を向上す
ることを目的とする。SUMMARY OF THE INVENTION The present invention aims to prevent color unevenness and improve contrast in a plastic film substrate liquid crystal display element.
1更立皇處
本発明の液晶表示素子は、対向する2枚のプラスチック
フィルム基板の対向面に表示電極を各々形成し、該基板
を離間、対向させて外周部をシールし、基板間隙部内に
液晶を封入してなるドツトマトリクス電極構造を有する
液晶表示素子において5表示電極周辺の液晶封入部の基
板対向面に、信号電圧が印加されないダミー電極を形成
したことを特徴とする。1. The liquid crystal display element of the present invention has display electrodes formed on the opposing surfaces of two opposing plastic film substrates. A liquid crystal display element having a dot matrix electrode structure in which liquid crystal is sealed is characterized in that a dummy electrode to which no signal voltage is applied is formed on the surface facing the substrate of the liquid crystal sealed part around five display electrodes.
以下、添付図面に沿って本発明をさらに詳細に説明する
。Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.
第1図は、本発明で用いられる上基板11を示す平明図
である。上基板11には、ITOなどの透明導電材料か
らなるストライプ状の表示電極13が形成されている。FIG. 1 is a plan view showing an upper substrate 11 used in the present invention. On the upper substrate 11, striped display electrodes 13 made of a transparent conductive material such as ITO are formed.
また、上基板11の外周部にはシール部17が形成され
ている。表示電極13とシール部17との間には、ダミ
ー電極25が形成されている。ダミー電極25は、表示
部19と表示部19−シール部15間とを同じ状態にす
るためのものであり、信号電圧は印加されない。ダミー
電極25は1表示電極13と同時に形成されることより
1表示電極13と同じ素材、同じ膜厚とすることができ
る。ダミー電極25はシール部15上に形成しないこと
が望ましい。なぜならば、一般に液晶表示素子に用いら
れるシール剤はエポキシ系接着剤であり、ITO膜同志
の接着に用いた時の接着力は、PET同志の接着力と比
べると著しく劣るためである。Further, a seal portion 17 is formed on the outer periphery of the upper substrate 11 . A dummy electrode 25 is formed between the display electrode 13 and the seal portion 17. The dummy electrode 25 is used to maintain the same state between the display section 19 and between the display section 19 and the seal section 15, and no signal voltage is applied thereto. Since the dummy electrode 25 is formed at the same time as the first display electrode 13, it can be made of the same material and have the same thickness as the first display electrode 13. It is desirable that the dummy electrode 25 not be formed on the seal portion 15. This is because the sealant generally used for liquid crystal display elements is an epoxy adhesive, and the adhesive force when used to bond ITO films together is significantly inferior to the adhesive force between PET films.
第2図は、下基板21を示す平面図であり、上基板と同
様に表度電極23が形成され、また、外周部にはシール
部15が形成されている。ダミー電極27は表示電極2
3とシール部17間とに形成されている。FIG. 2 is a plan view showing the lower substrate 21, in which a surface electrode 23 is formed similarly to the upper substrate, and a seal portion 15 is formed on the outer periphery. The dummy electrode 27 is the display electrode 2
3 and the seal portion 17.
第1図および第2図においては、ダミー電極の形成位置
を示すために上基板11および下基板21の双方にシー
ル部15を示したが、実際には、上基板11および下基
板21にそれぞれ表示電極13゜23およびダミー電極
25.27を形成し、いずれか一方にシール部17を形
成する接着剤を印刷し、開基板間にギャップ剤を散布し
、ストライプ状の表示電極が直交するように両基板11
.21を貼り合わせて空セルを作成し、液晶注入口重9
から液晶を注入して封入する。上基板11の表示電極1
3と下基板21の表示電極23との交差部が液晶表示素
子の表示部19となる。表示部19とシール部15との
間にダミー電極25.27が形成されているのでこの部
分のギャップの状況が表示部と同じとなり、表示部の背
景色と同色が得られ、表示品質が著しく改善される。In FIG. 1 and FIG. 2, the seal portion 15 is shown on both the upper substrate 11 and the lower substrate 21 to indicate the formation position of the dummy electrode, but in reality, the seal portion 15 is shown on the upper substrate 11 and the lower substrate 21, respectively. Display electrodes 13.23 and dummy electrodes 25.27 are formed, adhesive is printed on either side to form a seal portion 17, and a gap agent is spread between the open substrates so that the striped display electrodes are perpendicular to each other. Both boards 11
.. 21 to create an empty cell, and attach the liquid crystal inlet 9
Liquid crystal is injected and sealed. Display electrode 1 on upper substrate 11
3 and the display electrode 23 of the lower substrate 21 becomes the display section 19 of the liquid crystal display element. Since the dummy electrodes 25 and 27 are formed between the display part 19 and the seal part 15, the gap situation in this part is the same as that of the display part, and the same color as the background color of the display part is obtained, which significantly improves the display quality. Improved.
以上の説明では、シール部と表示部との間にダミー電極
を設ける場合について説明したが、表示電極に電気的に
接続しない部分であれば、他の部分にダミー電極を設け
てもよい。In the above description, a case has been described in which a dummy electrode is provided between the seal portion and the display portion, but the dummy electrode may be provided in any other portion as long as it is not electrically connected to the display electrode.
見豆ム羞果
本発明によれば、プラスチックフィルム基板を用いたド
ツトマトリクス型液晶表示装置において、信号電圧が印
加されないダミー電極を設けることにより、表示電極形
成部と同様の状態とすることができ、基板間のギャップ
不良による色ムラがなくなり1表示部の背景色と同色が
得られ、表示品質が著しく向上する。According to the present invention, in a dot matrix type liquid crystal display device using a plastic film substrate, by providing a dummy electrode to which no signal voltage is applied, it is possible to create a state similar to that of the display electrode forming part. , color unevenness due to poor gap between substrates is eliminated, the same color as the background color of one display area is obtained, and display quality is significantly improved.
第1図は本発明の実施例に用いられる上基板を、第2図
は同じく下基板を示す平面図である。
第3図は、従来のSTN型液晶表示素子を示す平面図、
第4図はそのA部の拡大図である。
11・・・上基板 13・・・表示電極15・・
・シール部 17・・・液晶注入口19・・・表示
部 21・・・下基板23・・・表示電極
25.27・・・ダミー電極29・・・色ムラ
第1図
第2t!1FIG. 1 is a plan view showing an upper substrate used in an embodiment of the present invention, and FIG. 2 is a plan view showing a lower substrate. FIG. 3 is a plan view showing a conventional STN type liquid crystal display element;
FIG. 4 is an enlarged view of section A. 11... Upper substrate 13... Display electrode 15...
-Seal part 17...Liquid crystal injection port 19...Display part 21...Lower substrate 23...Display electrode
25.27...Dummy electrode 29...Uneven color Figure 1, Figure 2t! 1
Claims (1)
に表示電極を各々形成し、該基板を離間一対向させて外
周部をシールし、基板間隙部内に液晶を封入してなるド
ットマトリクス電極構造型液晶表示素子において、表示
電極周辺の液晶封入部の基板対向面に、信号電圧が印加
されないダミー電極を形成したことを特徴とする液晶表
示素子。1. A dot matrix electrode structure type in which display electrodes are formed on the opposing surfaces of two opposing plastic film substrates, the substrates are spaced apart and facing each other, the outer periphery is sealed, and liquid crystal is sealed in the gap between the substrates. 1. A liquid crystal display element comprising: a dummy electrode to which no signal voltage is applied; a dummy electrode to which no signal voltage is applied is formed on a surface of a liquid crystal enclosure surrounding a display electrode facing a substrate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10131987A JPS63266427A (en) | 1987-04-24 | 1987-04-24 | Liquid crystal display element |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10131987A JPS63266427A (en) | 1987-04-24 | 1987-04-24 | Liquid crystal display element |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63266427A true JPS63266427A (en) | 1988-11-02 |
Family
ID=14297489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10131987A Pending JPS63266427A (en) | 1987-04-24 | 1987-04-24 | Liquid crystal display element |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63266427A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS649424A (en) * | 1987-07-02 | 1989-01-12 | Optrex Kk | Liquid crystal display element |
US5406398A (en) * | 1991-10-07 | 1995-04-11 | Canon Kabushiki Kaisha | Liquid crystal injection method using dummy electrodes |
US6774968B2 (en) | 2000-09-14 | 2004-08-10 | Seiko Epson Corporation | Liquid crystal device and electronic apparatus |
-
1987
- 1987-04-24 JP JP10131987A patent/JPS63266427A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS649424A (en) * | 1987-07-02 | 1989-01-12 | Optrex Kk | Liquid crystal display element |
US5406398A (en) * | 1991-10-07 | 1995-04-11 | Canon Kabushiki Kaisha | Liquid crystal injection method using dummy electrodes |
US6774968B2 (en) | 2000-09-14 | 2004-08-10 | Seiko Epson Corporation | Liquid crystal device and electronic apparatus |
US7088416B2 (en) | 2000-09-14 | 2006-08-08 | Seiko Epson Corporation | Liquid crystal device having pronged dummy electrodes and electronic device |
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