JP2001100210A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JP2001100210A JP2001100210A JP27521599A JP27521599A JP2001100210A JP 2001100210 A JP2001100210 A JP 2001100210A JP 27521599 A JP27521599 A JP 27521599A JP 27521599 A JP27521599 A JP 27521599A JP 2001100210 A JP2001100210 A JP 2001100210A
- Authority
- JP
- Japan
- Prior art keywords
- alignment film
- liquid crystal
- alignment
- substrate
- polyamic acid
- 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
-
- 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
-
- 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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Liquid Crystal (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自発分極を発生す
るネマティック液晶を用いて横電界を液晶の自発分極に
作用させることにより駆動させるタイプの液晶表示装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display of the type driven by applying a horizontal electric field to the spontaneous polarization of a liquid crystal using a nematic liquid crystal which generates a spontaneous polarization.
【０００２】[0002]
【従来の技術】上述した横電界にて駆動される液晶表示
装置として、薄膜トランジスタ（以下ＴＦＴと称す）基
板とそれに対向するカラーフィルタ（以下ＣＦと称す）
基板とに狭持され、これらの基板面に対して水平に配向
したネマティック液晶に、ＴＦＴ基板上を平行に走査す
る配線間に電圧を印加し、その液晶の有する誘電率異方
性に電界を作用させることによって駆動するものが知ら
れている。2. Description of the Related Art As a liquid crystal display device driven by the above-mentioned lateral electric field, a thin film transistor (hereinafter referred to as TFT) substrate and a color filter (hereinafter referred to as CF) opposed thereto are used.
A voltage is applied to the nematic liquid crystal, which is sandwiched between the substrates and is horizontally oriented with respect to the substrate surface, between wirings scanning in parallel on the TFT substrate, and an electric field is applied to the dielectric anisotropy of the liquid crystal. It is known to drive by acting.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の液晶表
示装置においては、従来のように同一の配向材からなる
配向膜をＴＦＴ基板とＣＦ基板の両面に使用すると、配
向膜はＴＦＴ基板とＣＦ基板の両基板において同じ配向
規制力、電気的特性、下地に対する接着力を有すること
になる。In the above-described conventional liquid crystal display device, if an alignment film made of the same alignment material is used on both sides of the TFT substrate and the CF substrate as in the conventional case, the alignment film becomes the TFT substrate and the CF substrate. Both substrates have the same alignment regulating force, electrical characteristics, and adhesion to the base.
【０００４】一般的にＴＦＴ基板に関しては、ＴＦＴ基
板表面近傍における液晶分子を無電界の状態で一定の向
きに配列させる強い配向規制力、電界印加による配向膜
自体の分極による残留電圧の低減、等が要求される。一
方、ＣＦ基板に関しては、液晶側からの光の入射による
ＣＦ透過光の均一性、即ち、配向膜とその下地との接着
性の均一性が要求される。In general, regarding a TFT substrate, a strong alignment regulating force for arranging liquid crystal molecules in a fixed direction in the vicinity of the surface of the TFT substrate in a state of no electric field, a reduction in residual voltage due to polarization of the alignment film itself by application of an electric field, etc. Is required. On the other hand, with respect to the CF substrate, uniformity of CF transmitted light due to incidence of light from the liquid crystal side, that is, uniformity of adhesiveness between the alignment film and its base is required.
【０００５】要するに、ＴＦＴ基板とＣＦ基板のそれぞ
れに付けられる配向膜に要求される特性が異なるので、
同一の配向材からなる配向膜をＴＦＴ基板とＣＦ基板の
両面に使用した場合、ＴＦＴ基板とＣＦ基板のそれぞれ
に付けられる配向膜が液晶表示装置として最適化された
ものではなくなり、ＴＦＴ基板の配向膜に強い配向規制
力、低残留電圧の特性を持たせると、配向膜の下地に対
する接着力が低下するので、ＣＦ基板のＣＦ透過光の均
一性が悪くなり、ＣＦ基板のＣＦ透過光の均一性を良く
すると、配向膜の下地に対する接着力が良くなる代わり
にＴＦＴ基板の配向規制力、残留電圧特性が悪くなると
いう、問題があった。[0005] In short, since the characteristics required for the alignment films attached to the TFT substrate and the CF substrate are different,
When an alignment film made of the same alignment material is used on both sides of the TFT substrate and the CF substrate, the alignment films attached to the TFT substrate and the CF substrate are not optimized for the liquid crystal display device, and the alignment of the TFT substrate is not performed. If the film has strong alignment regulating power and low residual voltage characteristics, the adhesive strength of the alignment film to the base decreases, so that the uniformity of the CF transmitted light of the CF substrate deteriorates and the uniformity of the CF transmitted light of the CF substrate becomes uniform. When the property is improved, the adhesion of the alignment film to the underlayer is improved, but the alignment regulating force and the residual voltage characteristics of the TFT substrate are deteriorated.
【０００６】本発明の目的は、特に、横電界駆動液晶表
示装置の２つの対向基板における配向膜をそれぞれの基
板に対して最適化して、表示品質の優れた液晶表示装置
を提供することにある。[0006] It is an object of the present invention to provide a liquid crystal display device having excellent display quality by optimizing the alignment films of two opposing substrates of a lateral electric field drive liquid crystal display device. .
【０００７】[0007]
【課題を解決するための手段】本発明の液晶表示装置
は、最上層が第１の配向膜で覆われた第１の基板と、最
上層が第２の配向膜で覆われた第２の基板と、前記第１
の配向膜と前記第２の配向膜との間に狭持された液晶と
からなる液晶表示装置であって、前記第１の配向膜と前
記第２の配向膜とがそれぞれ互いに異なる配向材からな
ることを特徴とし、前記第１の基板上には薄膜トランジ
スタ及び配線が形成されており、前記第２の基板上には
カラーフィルタが形成されており、前記第１の基板上を
走査する互いに離間した前記配線間に異なる電圧を印加
することにより前記液晶を前記第１の基板面に平行な面
内において所定の角度で回転させる、というものであ
る。A liquid crystal display device according to the present invention comprises a first substrate having an uppermost layer covered by a first alignment film, and a second substrate having an uppermost layer covered by a second alignment film. A substrate and the first
A liquid crystal display device comprising a liquid crystal sandwiched between a first alignment film and a second alignment film, wherein the first alignment film and the second alignment film are made of different alignment materials. Wherein a thin film transistor and a wiring are formed on the first substrate, and a color filter is formed on the second substrate, and are separated from each other for scanning on the first substrate. By applying different voltages between the wirings, the liquid crystal is rotated at a predetermined angle in a plane parallel to the first substrate surface.
【０００８】本発明の液晶表示装置の第１の具体的な構
成は、前記第１の配向膜が可溶性ポリミドであり、前記
前記第２の配向膜がポリアミック酸であり、前記可溶性
ポリミドは、ポリアミック酸に脱水処理を施して、ポリ
アミック酸に含まれるカルボン酸残基を除去したもので
ある、というものである。In a first specific configuration of the liquid crystal display device according to the present invention, the first alignment film is a soluble polyimide, the second alignment film is a polyamic acid, and the soluble polyimide is a polyamic acid. The acid is subjected to a dehydration treatment to remove carboxylic acid residues contained in the polyamic acid.
【０００９】本発明の液晶表示装置の第２の具体的な構
成は、前記第１の配向膜が第１のポリアミック酸であ
り、前記前記第２の配向膜が前記第１のポリアミック酸
とは異なる組成の第２のポリアミック酸であり、前記第
１のポリアミック酸は、ポリミド分子の中にイミド基と
隣接するベンゼン環を有さず、前記第２のポリアミック
酸は、ポリミド分子の中にイミド基と隣接するベンゼン
環を有する、というものである。In a second specific configuration of the liquid crystal display device according to the present invention, the first alignment film is a first polyamic acid, and the second alignment film is different from the first polyamic acid. A second polyamic acid having a different composition, wherein the first polyamic acid does not have a benzene ring adjacent to an imide group in the polyamide molecule, and the second polyamic acid has an imide group in the polyamide molecule. It has a benzene ring adjacent to the group.
【００１０】[0010]
【発明の実施の形態】本発明の液晶表示装置の第１の実
施形態を、図１を用いて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the liquid crystal display of the present invention will be described with reference to FIG.
【００１１】まず、ＴＦＴ基板側は、以下のような構成
となっている。裏面に偏光板１０を有するガラス基板１
上にＴＦＴ回路を構成する電極２及び電極３が形成され
ており、電極２及び電極３を覆う平坦化膜４が形成され
ている。平坦化膜４は、ＩＴＯ層からなる画素電極や画
素電極を被覆するパッシベーション膜を含み、平坦化膜
４上には、可溶性ポリミドからなるＴＦＴ基板側配向膜
５が形成されている。ここで、可溶性ポリミドは、ポリ
アミック酸に脱水処理を施して、ポリアミック酸に含ま
れるカルボン酸残基を除去して得られる。First, the TFT substrate side has the following configuration. Glass substrate 1 having polarizing plate 10 on the back
An electrode 2 and an electrode 3 constituting a TFT circuit are formed thereon, and a flattening film 4 covering the electrode 2 and the electrode 3 is formed. The flattening film 4 includes a pixel electrode made of an ITO layer and a passivation film that covers the pixel electrode. On the flattening film 4, a TFT substrate-side alignment film 5 made of soluble polyimide is formed. Here, the soluble polyamide is obtained by subjecting a polyamic acid to a dehydration treatment to remove carboxylic acid residues contained in the polyamic acid.
【００１２】一方、ＴＦＴ基板側に対向する対向基板
は、以下のようにして形成する。まず、裏面に偏光板２
０を有するガラス基板２１上に、樹脂またはＣｒからな
る遮光層、カラーフィルターの色層、樹脂からなるオー
バーコート層等を含む平坦化膜２４が形成され、その上
には、ポリアミック酸からなる対向基板側配向膜２５が
形成されている。On the other hand, a counter substrate facing the TFT substrate side is formed as follows. First, the polarizing plate 2
On a glass substrate 21 having a thickness of 0, a flattening film 24 including a light-shielding layer made of resin or Cr, a color layer of a color filter, an overcoat layer made of resin, and the like is formed. A substrate-side alignment film 25 is formed.
【００１３】上記に述べたＴＦＴ基板側配向膜５と対向
基板側配向膜２５は、それぞれ次のような特徴を有して
いる。The above-described TFT substrate-side alignment film 5 and counter substrate-side alignment film 25 have the following features.
【００１４】まず、ＴＦＴ基板側配向膜５は、可溶性ポ
リイミドを使用するので、電気特性及び配向規制力に優
れているという利点を有する。First, since the TFT substrate-side alignment film 5 uses soluble polyimide, it has an advantage that it has excellent electrical characteristics and alignment control power.
【００１５】次に、対向基板側配向膜２５は、ポリアミ
ック酸を使用するので、可溶性ポリイミドと比較すると
製造上幅広い溶剤の選択が可能となり、均一な膜厚の配
向膜とすることが出来るという利点を有する。Next, since the opposite substrate side alignment film 25 uses polyamic acid, it is possible to select a wider range of solvents in production than soluble polyimide, and it is possible to obtain an alignment film having a uniform film thickness. Having.
【００１６】以上のようにして形成されたＴＦＴ基板と
対向基板の間には、それぞれＴＦＴ基板側配向膜５と対
向基板側配向膜２５とを互いに対向させて液晶１１が充
填される。The liquid crystal 11 is filled between the TFT substrate and the counter substrate formed as described above, with the TFT substrate side alignment film 5 and the counter substrate side alignment film 25 facing each other.
【００１７】このようにして得られた横電界駆動液晶表
示装置は、以下のような特徴を有する。The lateral electric field driving liquid crystal display device thus obtained has the following features.
【００１８】まず、ＴＦＴ側の配向膜が可溶性ポリイミ
ドを使用するので、液晶中の電流のリークによる表示ム
ラ・表示シミが少なく、また、配向膜自体の分極による
残留電圧を低減できるので、液晶の配向欠陥による点欠
陥の少ない表示が得られる。First, since a soluble polyimide is used for the alignment film on the TFT side, display unevenness and display stains due to current leakage in the liquid crystal are reduced, and a residual voltage due to polarization of the alignment film itself can be reduced. A display with few point defects due to alignment defects can be obtained.
【００１９】更に、ＣＦ側の配向膜がポリアミック酸を
使用すると、印刷法を用いて配向膜を下地の平坦化膜に
印刷する際の溶剤に、均一な膜厚を得るために様々な材
料を選択することが出来るため、配向膜の膜厚ムラによ
る表示ムラの少ないデバイスを得ることが出来る。Further, when the alignment film on the CF side uses polyamic acid, various materials are used in a solvent for printing the alignment film on the underlying flattening film by a printing method in order to obtain a uniform film thickness. Since selection is possible, a device with less display unevenness due to thickness unevenness of the alignment film can be obtained.
【００２０】次に、本発明の液晶表示装置の第２の実施
形態を説明する。Next, a second embodiment of the liquid crystal display device of the present invention will be described.
【００２１】ＴＦＴ基板側配向膜及び対向基板側配向膜
以外は第１の実施形態と同じであるので詳細な説明は省
略し、ＴＦＴ基板側配向膜及び対向基板側配向膜の材料
に重点を置いて説明する。Since the structure other than the TFT substrate-side alignment film and the counter substrate-side alignment film is the same as that of the first embodiment, detailed description is omitted, and the emphasis is placed on the materials of the TFT substrate-side alignment film and the counter substrate-side alignment film. Will be explained.
【００２２】ＴＦＴ基板側には、偏光板４０、ガラス基
板４１、電極４２及び電極４３、平坦化膜４４が形成さ
れている。平坦化膜４４上にはポリアミック酸Ａからな
るＴＦＴ基板側配向膜４５を形成する。On the TFT substrate side, a polarizing plate 40, a glass substrate 41, electrodes 42 and 43, and a flattening film 44 are formed. On the flattening film 44, a TFT substrate side alignment film 45 made of polyamic acid A is formed.
【００２３】一方、対向基板側には、偏光板６０、ガラ
ス基板６１、平坦化膜６４が形成され、平坦化膜６４の
上にはポリアミック酸Ｂからなる対向基板側配向膜６５
を形成する。On the other hand, a polarizing plate 60, a glass substrate 61 and a flattening film 64 are formed on the counter substrate side, and a counter substrate side alignment film 65 made of polyamic acid B is formed on the flattening film 64.
To form
【００２４】上記に述べたＴＦＴ基板側配向膜４５と対
向基板側配向膜６５は、それぞれ次のような特徴を有し
ている。The above-described TFT substrate side alignment film 45 and counter substrate side alignment film 65 have the following features.
【００２５】まず、ＴＦＴ基板側配向膜４５は、配向膜
材料であるポリイミド分子の中にイミド基と隣接するベ
ンゼン環を有していないので、ポリイミド分子の分子内
分極が小さく、電極間の電圧を強く保持できるという利
点を有する。First, since the TFT substrate side alignment film 45 does not have a benzene ring adjacent to an imide group in the polyimide molecule as the alignment film material, the intramolecular polarization of the polyimide molecule is small and the voltage between the electrodes is low. Has the advantage that it can be strongly held.
【００２６】次に、対向基板側配向膜６５は、配向膜の
材料であるポリイミド分子の中にイミド基と隣接するベ
ンゼン環を有しているので、ベンゼン環のπ電子がイミ
ド基の分子内分極によりポリイミド分子自身が大きく分
極するため配向規制力が大きくなるという利点を有す
る。Next, since the opposite substrate side alignment film 65 has a benzene ring adjacent to an imide group in a polyimide molecule which is a material of the alignment film, the π electron of the benzene ring is converted into the imide group molecule. There is an advantage that the orientation regulating force is increased because the polyimide molecule itself is greatly polarized by the polarization.
【００２７】以上のようにして形成されたＴＦＴ基板と
対向基板の間には、それぞれＴＦＴ基板側配向膜４５と
対向基板側配向膜６５とを互いに対向させて液晶５１が
充填される。The liquid crystal 51 is filled between the TFT substrate and the counter substrate formed as described above, with the TFT substrate side alignment film 45 and the counter substrate side alignment film 65 facing each other.
【００２８】このようにして得られた液晶表示装置は、
以下のような特徴を有する。The liquid crystal display thus obtained is
It has the following features.
【００２９】まず、ＴＦＴ側に高電圧保持特性の配向材
を使用しているので、電極間の電流のリークによる表示
ムラの少ない表示パネルを得ることが出来る。First, since an alignment material having a high voltage holding characteristic is used on the TFT side, a display panel with less display unevenness due to current leakage between the electrodes can be obtained.
【００３０】又、ＣＦ側に配向規制力の強い配向材を使
用しているので、電気特性を優先させたＴＦＴ側での配
向規制力不足を補い、配向欠陥の少ないパネルを得るこ
とが出来る。Further, since the alignment material having a strong alignment control force is used on the CF side, it is possible to compensate for the shortage of the alignment control force on the TFT side, which gives priority to the electrical characteristics, and to obtain a panel with less alignment defects.
【００３１】更に、ＴＦＴ基板、対向基板共にポリアミ
ック酸である配向膜を有しているので印刷性が優れ、配
向膜厚ムラの少ない表示パネルが得られる。Further, since both the TFT substrate and the counter substrate have an alignment film of polyamic acid, a display panel having excellent printability and having less unevenness in the alignment film thickness can be obtained.
【００３２】[0032]
【発明の効果】以上のように、本発明の実施形態によれ
ば、ＴＦＴ基板側とＣＦ基板側に異なる材料からなる配
向膜を使用し、液晶配向欠陥及び表示ムラの少ない液晶
表示装置を達成する。As described above, according to the embodiment of the present invention, an alignment film made of different materials is used on the TFT substrate side and the CF substrate side, thereby achieving a liquid crystal display device with less liquid crystal alignment defects and display unevenness. I do.
【００３３】具体的には、本発明の第１の形態によれ
ば、ＴＦＴ基板側の配向膜には可溶性ポリイミドを使用
して、液晶中の電流のリーク及び配向膜自体の分極によ
る残留電圧を低減できるので、表示ムラ・表示シミ及び
液晶の配向欠陥による点欠陥を少なくし、ＣＦ基板側の
配向膜にはＴＦＴ基板側の配向膜とは異なるポリアミッ
ク酸を使用して、均一な膜厚の配向膜を得ることが出来
るため、配向膜の膜厚ムラによる表示ムラの少ないデバ
イスを得ることが出来る。Specifically, according to the first embodiment of the present invention, a soluble polyimide is used for the alignment film on the TFT substrate side to reduce the current leakage in the liquid crystal and the residual voltage due to the polarization of the alignment film itself. Since it can be reduced, display defects and display spots and point defects due to alignment defects of liquid crystal are reduced, and a polyamic acid different from the alignment film on the TFT substrate side is used for the alignment film on the CF substrate side, so that a uniform film thickness is obtained. Since an alignment film can be obtained, a device with less display unevenness due to uneven thickness of the alignment film can be obtained.
【００３４】又、本発明の第２の形態によれば、ＴＦＴ
基板側の配向膜には高電圧保持特性の配向材を使用し
て、電極間の電流のリークを低減できるので表示ムラを
少なくでき、ＣＦ基板側の配向膜には配向規制力の強い
配向材を使用して、電気特性を優先させたＴＦＴ基板側
での配向規制力不足を補うことができるので、配向欠陥
の少ないパネルを得ることが出来る。更に、ＴＦＴ基
板、ＣＦ基板（対向基板）共にポリアミック酸である配
向膜を有しているので印刷性が優れ、配向膜厚ムラの少
ない表示パネルが得られる、という効果も有する。According to the second embodiment of the present invention, the TFT
An alignment material having a high voltage holding property is used for the alignment film on the substrate side, so that current leakage between the electrodes can be reduced, so that display unevenness can be reduced. Can be used to compensate for the shortage of the alignment regulating force on the TFT substrate side in which the electrical characteristics are prioritized, so that a panel with few alignment defects can be obtained. Further, since both the TFT substrate and the CF substrate (opposite substrate) have an alignment film of polyamic acid, there is an effect that a display panel having excellent printability and having less unevenness in alignment film thickness can be obtained.
【図１】本発明の第１、２の実施形態による液晶表示装
置の断面図である。FIG. 1 is a sectional view of a liquid crystal display according to first and second embodiments of the present invention.
１、２１、４１、６１ ガラス基板 ２、３ 電極 ４、２４、４４、６４ 平坦化膜 ５、２５、４５、６５ 配向膜 １０、２０、４０、６０ 偏光板 １１、５１ 液晶 1, 21, 41, 61 Glass substrate 2, 3 Electrode 4, 24, 44, 64 Flattening film 5, 25, 45, 65 Alignment film 10, 20, 40, 60 Polarizing plate 11, 51 Liquid crystal
Claims (6)
基板と、最上層が第２の配向膜で覆われた第２の基板
と、前記第１の配向膜と前記第２の配向膜との間に狭持
された液晶とからなる液晶表示装置であって、前記第１
の配向膜と前記第２の配向膜とがそれぞれ互いに異なる
配向材からなることを特徴とする液晶表示装置。A first substrate having an uppermost layer covered by a first alignment film; a second substrate having an uppermost layer covered by a second alignment film; A liquid crystal device sandwiched between the first and second alignment films.
The liquid crystal display device, wherein the alignment film and the second alignment film are made of different alignment materials.
及び配線が形成されており、前記第２の基板上にはカラ
ーフィルタが形成されており、前記第１の基板上を走査
する互いに離間した前記配線間に異なる電圧を印加する
ことにより前記液晶を前記第１の基板面に平行な面内に
おいて所定の角度で回転させる請求項１記載の液晶表示
装置。2. A thin film transistor and a wiring are formed on the first substrate, and a color filter is formed on the second substrate, and are separated from each other for scanning on the first substrate. The liquid crystal display device according to claim 1, wherein the liquid crystal is rotated at a predetermined angle in a plane parallel to the first substrate surface by applying different voltages between the wirings.
り、前記前記第２の配向膜がポリアミック酸である請求
項１又は２記載の液晶表示装置。3. The liquid crystal display device according to claim 1, wherein said first alignment film is a soluble polyimide, and said second alignment film is a polyamic acid.
に脱水処理を施して、ポリアミック酸に含まれるカルボ
ン酸残基を除去したものである請求項３記載の液晶表示
装置。4. The liquid crystal display device according to claim 3, wherein the soluble polyimide is obtained by subjecting a polyamic acid to a dehydration treatment to remove carboxylic acid residues contained in the polyamic acid.
酸であり、前記前記第２の配向膜が前記第１のポリアミ
ック酸とは異なる組成の第２のポリアミック酸である請
求項１又は２記載の液晶表示装置。5. The method according to claim 1, wherein the first alignment film is a first polyamic acid, and the second alignment film is a second polyamic acid having a composition different from that of the first polyamic acid. 3. The liquid crystal display device according to 2.
分子の中にイミド基と隣接するベンゼン環を有さず、前
記第２のポリアミック酸は、ポリミド分子の中にイミド
基と隣接するベンゼン環を有する請求項５記載の液晶表
示装置。6. The first polyamic acid does not have a benzene ring adjacent to an imide group in a polyimide molecule, and the second polyamic acid has a benzene ring adjacent to an imide group in a polyimide molecule. The liquid crystal display device according to claim 5, comprising:
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27521599A JP2001100210A (en) | 1999-09-28 | 1999-09-28 | Liquid crystal display device |
| KR1020000056957A KR20010030523A (en) | 1999-09-28 | 2000-09-28 | Liquid crystal display device and fabrication method of the same |
| GB0023793A GB2356942A (en) | 1999-09-28 | 2000-09-28 | Liquid crystal display device and fabrication method of the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27521599A JP2001100210A (en) | 1999-09-28 | 1999-09-28 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001100210A true JP2001100210A (en) | 2001-04-13 |
Family
ID=17552313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27521599A Pending JP2001100210A (en) | 1999-09-28 | 1999-09-28 | Liquid crystal display device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2001100210A (en) |
| KR (1) | KR20010030523A (en) |
| GB (1) | GB2356942A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009271390A (en) * | 2008-05-09 | 2009-11-19 | Seiko Epson Corp | Liquid crystal display and electronic equipment |
| CN101273300B (en) * | 2005-09-30 | 2010-05-19 | 夏普株式会社 | Liquid crystal display unit |
| US7782414B2 (en) | 2003-12-23 | 2010-08-24 | Lg Display Co., Ltd. | Method for fabricating in-plane switching mode liquid crystal display device |
| JP2016118752A (en) * | 2014-12-22 | 2016-06-30 | 業▲キン▼科技顧問股▲ふん▼有限公司 | Liquid crystal display panel and manufacturing method of the same |
| US9823511B2 (en) | 2014-03-21 | 2017-11-21 | Samsung Display Co., Ltd. | Liquid crystal display wherein a first resistivity value of a first alignment layer is smaller than a second resistivity value of a second alignment layer |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005010202A (en) * | 2003-06-16 | 2005-01-13 | Nec Corp | Liquid crystal panel, liquid crystal display device using liquid crystal panel, and electronic device on which liquid crystal display is mounted |
| KR100752215B1 (en) | 2003-12-04 | 2007-08-27 | 엘지.필립스 엘시디 주식회사 | The in-plane switching liquid display device and the method for fabricating the same |
| JP4544048B2 (en) * | 2005-06-20 | 2010-09-15 | セイコーエプソン株式会社 | LCD panel and electronic equipment |
| US20120050719A1 (en) * | 2009-05-18 | 2012-03-01 | Takafumi Hayama | Liquid crystal panel and method for inspecting liquid crystal panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08271919A (en) * | 1995-03-31 | 1996-10-18 | Hitachi Ltd | Active matrix type liquid crystal display device |
| JPH09185064A (en) * | 1995-12-28 | 1997-07-15 | Japan Synthetic Rubber Co Ltd | Imide group-containing polyamic acid and its production as well as liquid crystal orienting agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4726659A (en) * | 1986-02-24 | 1988-02-23 | Rca Corporation | Display device having different alignment layers |
| US4796979A (en) * | 1986-04-07 | 1989-01-10 | Canon Kabushiki Kaisha | Ferroelectric liquid crystal device having dual laminated alignment films |
| KR100236518B1 (en) * | 1996-09-21 | 2000-01-15 | 구본준 | A liquid crystal display device |
-
1999
- 1999-09-28 JP JP27521599A patent/JP2001100210A/en active Pending
-
2000
- 2000-09-28 GB GB0023793A patent/GB2356942A/en not_active Withdrawn
- 2000-09-28 KR KR1020000056957A patent/KR20010030523A/en not_active Application Discontinuation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08271919A (en) * | 1995-03-31 | 1996-10-18 | Hitachi Ltd | Active matrix type liquid crystal display device |
| JPH09185064A (en) * | 1995-12-28 | 1997-07-15 | Japan Synthetic Rubber Co Ltd | Imide group-containing polyamic acid and its production as well as liquid crystal orienting agent |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7782414B2 (en) | 2003-12-23 | 2010-08-24 | Lg Display Co., Ltd. | Method for fabricating in-plane switching mode liquid crystal display device |
| KR101002328B1 (en) | 2003-12-23 | 2010-12-17 | 엘지디스플레이 주식회사 | The method for fabricating the IPS liquid crystal display device |
| CN101273300B (en) * | 2005-09-30 | 2010-05-19 | 夏普株式会社 | Liquid crystal display unit |
| JP2009271390A (en) * | 2008-05-09 | 2009-11-19 | Seiko Epson Corp | Liquid crystal display and electronic equipment |
| US9823511B2 (en) | 2014-03-21 | 2017-11-21 | Samsung Display Co., Ltd. | Liquid crystal display wherein a first resistivity value of a first alignment layer is smaller than a second resistivity value of a second alignment layer |
| JP2016118752A (en) * | 2014-12-22 | 2016-06-30 | 業▲キン▼科技顧問股▲ふん▼有限公司 | Liquid crystal display panel and manufacturing method of the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0023793D0 (en) | 2000-11-08 |
| KR20010030523A (en) | 2001-04-16 |
| GB2356942A (en) | 2001-06-06 |
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