CN100483227C

CN100483227C - Reflective liquid crystal display device

Info

Publication number: CN100483227C
Application number: CNB200410027439XA
Authority: CN
Inventors: 杨秋莲; 彭家鹏
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Innolux Corp
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Innolux Corp
Priority date: 2004-05-28
Filing date: 2004-05-28
Publication date: 2009-04-29
Anticipated expiration: 2024-05-28
Also published as: CN1704803A

Abstract

This invention relates to a reflection LCD device including an upper base plate, a lower base plate set opposite to the upper one, a LC layer, a public electrode and multiple pixel electrodes, among which, said LC layer is set between the two base plates, said public electrode is a conducting material with the reflection performance set between the lower base plate and the LC layer, said pixel electrodes are set between the public electrode and the LC layer forming an edge electric field with the public electrode, said pixel electrodes include at least two pats, which bend to different directions separately or part in arc structure.

Description

Reflective LCD device

[technical field]

The invention relates to a kind of liquid crystal indicator, refer to a kind of reflective LCD device especially.

[background technology]

Liquid crystal indicator is according to its unusual three kinds of reflective LCD device, penetration liquid crystal display device and half penetrated liquid crystal indicator that are divided into that adopt light source.Reflective LCD device is to utilize external light source to provide to show required light beam, and this light source is mainly natural light, also can be outside artificial light sources, is generally positioned at the reflective LCD device outside, and this type of liquid crystal indicator can the amount of saving energy.Reflective LCD device has been widely used in videophone, the portable digital-assistant (Personal Digital Assistant, PDA) and various computer installations in.

Seeing also Fig. 1, is a kind of reflective LCD device schematic perspective view that the United States Patent (USP) of on June 24th, 2003 bulletin is disclosed for the 6th, 583, No. 842.This liquid crystal indicator comprises: an infrabasal plate 11 and a upper substrate 12; Liquid crystal layer 13 between infrabasal plate 11 and upper substrate 12; Be positioned at the public electrode 111 of infrabasal plate 11 upper surfaces; Be positioned at the pixel electrode 112 on the

public electrode

111, and 112 of public electrode 111 and pixel electrodes separate with insulation course 113, when then adding voltage, form an edge electric field between pixel electrode 112 and the public electrode 111; 13 of infrabasal plate 11 and liquid crystal layers form a both alignment layers 114; Form a both alignment layers 124 between upper substrate 12 and liquid crystal layer; The outside surface of upper substrate 12 forms a polaroid 125.Because this reflective LCD device adopts FFS (Fring Field Swithing, fringe field conversion) technology, 112 of its public electrode 111 and pixel electrodes constitute a parallel electric field, and liquid crystal molecule 130 is rotated in the plane parallel with substrate.

See also Fig. 2, be these reflective LCD device pixel electrode 112 structural representations.(Thin Film Transistor, TFT) electric switch provide electric signal to pixel electrode 112 by data line 118 to gate line 116 control TFT 117.Because this pixel electrode 112 adopts the strip shaped electric poles structure, when therefore adding voltage, the fringe field direction of

pixel electrode

112 and 111 generations of public electrode is unique, thereby just defines visible angle, and its viewing angle characteristic is not good.

[summary of the invention]

For overcoming the not good problem of reflective LCD device viewing angle characteristic in the prior art, the invention provides the preferable reflective LCD device of multiple viewing angle characteristic.

The invention provides infrabasal plate, a liquid crystal layer, a public electrode and a plurality of pixel electrode that a kind of reflective LCD device comprises a upper substrate, is oppositely arranged with upper substrate, this liquid crystal layer is between upper substrate and infrabasal plate, this public electrode is the conductive material with reflecting properties, it is between infrabasal plate and liquid crystal layer, this pixel electrode is arranged between public electrode and the liquid crystal layer, form an edge electric field between pixel electrode and public electrode, and this pixel electrode is a S shape structure.

The present invention provides again that a kind of reflective LCD device comprises a upper substrate, the infrabasal plate, a liquid crystal layer, a public electrode, a plurality of pixel electrode and that are oppositely arranged with upper substrate are positioned at the reflection horizon on the infrabasal plate, this liquid crystal layer is between upper substrate and infrabasal plate, between the substrate and liquid crystal layer of this public electrode in upper substrate and infrabasal plate, this pixel electrode is arranged between public electrode and the liquid crystal layer, form an edge electric field between pixel electrode and public electrode, and this pixel electrode is a S shape structure.

Compared to prior art, because it comprises two parts at least pixel electrode, these two parts are crooked or at least one part employing of this pixel electrode convex structure to different directions respectively, so the fringe field that forms between pixel electrode and public electrode, and its direction of an electric field is not unique.When pixel electrode is zigzag, itself and public electrode produce a pair of territory electric field, liquid crystal molecule can make this pixel be divided into two zones on display effect along both direction deflection under this electric field action, and the aberration that two zones cause can compensate mutually, and pixel electrode is when being S shape, itself and public electrode produce a multiple domain electric field, further compensate for chromatic aberration, therefore, this reflective LCD device contrast on all directions strengthens, thereby viewing angle characteristic is better.

[description of drawings]

Fig. 1 is a prior art reflective LCD device floor map.

Fig. 2 is the prior art reflective LCD device pixel electrode structure synoptic diagram.

Fig. 3 is the reflective LCD device first embodiment floor map of the present invention.

Fig. 4 is the reflective LCD device first embodiment pixel electrode structure synoptic diagram of the present invention.

Fig. 5 is the enlarged diagram of area I among Fig. 4.

Fig. 6 is the reflective LCD device second embodiment floor map of the present invention.

Fig. 7 is the reflective LCD device second embodiment pixel electrode structure synoptic diagram of the present invention.

Fig. 8 is the enlarged diagram of area I I among Fig. 7.

[embodiment]

Seeing also Fig. 3, is the diagrammatic cross-section of reflective LCD device first embodiment of the present invention.Reflective LCD device of the present invention comprises a upper substrate 22, the infrabasal plate 21, a liquid crystal layer 23, a public electrode 211 and a plurality of pixel electrode 212 that are oppositely arranged with it.Wherein the inside surface of upper substrate 22 is provided with a both alignment layers 224, and its outside surface is provided with a polaroid 225; One infrabasal plate 21, its inside surface is provided with public electrode 211, insulation course 213, pixel electrode 212 and both alignment layers 214 successively, wherein this public electrode 211 is the conductive material with reflecting properties, 211 of pixel electrode 212 and public electrodes form an edge electric field, and this pixel electrode 212 adopts Z-shaped curvilinear structures; Liquid crystal layer 23 is between upper substrate 22 and infrabasal plate 21.This polaroid 225 also can be arranged between upper substrate 22 inside surfaces and the both alignment layers 224.

Seeing also Fig. 4 and Fig. 5, is the enlarged diagram of reflective LCD device first embodiment pixel electrode structure synoptic diagram of the present invention and area I.Gate line 216 control TFT 217 electric switches provide electric signal to pixel electrode 212 by data line 218.Because pixel electrode 212 adopts Z-shaped structure, thereby it can produce the electric field of two different directions after applying voltage, the direction of an electric field and the direction of an electric field below the broken line bending place that are its top, broken line bending place in the area I are inconsistent, liquid crystal molecule 230 its yawing moments and the liquid crystal molecule 230 below the broken line bending place that then are positioned at top, broken line bending place in the area I are inconsistent, make this pixel on display effect, be divided into two zones, the aberration that two zones cause can compensate mutually, therefore, this liquid crystal indicator contrast on all directions strengthens, thereby viewing angle characteristic is better.Data line 218 can adopt the zigzag structure identical with pixel electrode 212, also can adopt rectilinear structure.

Wherein, public electrode 211 also can adopt transparency electrode, and reflects by outside surface or the 219 pairs of incident lights of infrabasal plate 21 and public electrode 211 addings, one reflection horizon at infrabasal plate 21, and this reflection horizon also can be arranged at the lower surface of infrabasal plate 21.Reflection horizon 219 can be multilayer and has reflecting properties material formation.Can form a plurality of projections (Bump) on these 219 surfaces, reflection horizon, to improve the incident light reflecting effect.This public electrode 211 is during as the reflection horizon, and its surface also can form a plurality of projections.

Seeing also Fig. 6, is the diagrammatic cross-section of reflective LCD device second embodiment of the present invention.Reflective LCD device of the present invention comprises that an infrabasal plate 31, a upper substrate 32, are positioned at liquid crystal layer 33, a public electrode 321 and a plurality of pixel electrode 322 of 32 of infrabasal plate 31 and upper substrates.These upper substrate 32 upper surfaces are provided with polaroid 325, inside surface is provided with pixel electrode 322, insulation course 323, public electrode 321 and both alignment layers 324 successively, 321 of pixel electrode 322 and public electrodes form an edge electric field, and this pixel electrode 322 adopts the sigmoid curve structure; These infrabasal plate 31 inside surfaces are provided with reflection horizon 319 and both alignment layers 314 successively.

Seeing also Fig. 7 and Fig. 8, is the enlarged diagram of reflective LCD device second embodiment pixel electrode structure synoptic diagram of the present invention and area I I.Gate line 326 control TFT 327 electric switches provide electric signal to pixel electrode 322 by data line 328.Because pixel electrode 322 adopts S shape structure, thereby its direction of an electric field is a continually varying behind the adding voltage, form a continuous domain electric field, because liquid crystal molecule 330 is along direction of an electric field deflection, so liquid crystal molecule 330 yawing moments also are to change continuously in the pixel region, make this pixel form continuous domain on display effect, the aberration that continuous domain causes can compensate mutually, therefore, this reflective LCD device contrast on all directions strengthens, thereby viewing angle characteristic is better.

Wherein, its reflection horizon 319 of this reflective LCD device also can be arranged on the outside surface of infrabasal plate.

Claims

1. reflective LCD device, infrabasal plate, a liquid crystal layer, a public electrode and a plurality of pixel electrode that it comprises a upper substrate, is oppositely arranged with upper substrate, this liquid crystal layer is between upper substrate and infrabasal plate, this public electrode is the conductive material with reflecting properties, it is between infrabasal plate and liquid crystal layer, this pixel electrode is arranged between public electrode and the liquid crystal layer, it is characterized in that: form an edge electric field between pixel electrode and public electrode, and this pixel electrode is a S shape structure.

2. reflective LCD device as claimed in claim 1 is characterized in that: the upper surface of this upper substrate is provided with a polaroid.

3. reflective LCD device as claimed in claim 1 is characterized in that: be provided with a both alignment layers between this upper substrate and liquid crystal layer.

4. reflective LCD device as claimed in claim 3 is characterized in that: be provided with a polaroid between this upper substrate and both alignment layers.

5. reflective LCD device as claimed in claim 1 is characterized in that: this public electrode surface has some projectioies.

6. reflective LCD device as claimed in claim 1, it is characterized in that: it further comprises a plurality of gate lines and data line, a plurality of thin film transistor (TFT)s, this liquid crystal layer is between upper substrate and infrabasal plate, gate line and data line are formed on the infrabasal plate, it constitutes a plurality of pixel regions, its grid of this thin film transistor (TFT) is connected with gate line, source electrode is connected with data line, this public electrode is between infrabasal plate and liquid crystal layer, and this public electrode is the conductive material with reflecting properties, this pixel electrode is between public electrode and liquid crystal layer, and the drain electrode of this pixel electrode and thin film transistor (TFT) has and is electrically connected.

7. reflective LCD device as claimed in claim 6 is characterized in that: the upper surface of this upper substrate is provided with a polaroid.

8. reflective LCD device as claimed in claim 6 is characterized in that: be provided with a both alignment layers between this upper substrate and liquid crystal layer.

9. reflective LCD device as claimed in claim 8 is characterized in that: be provided with a polaroid between this upper substrate and both alignment layers.

10. reflective LCD device as claimed in claim 6 is characterized in that: this public electrode surface has some projectioies.

11. reflective LCD device as claimed in claim 6 is characterized in that: at least one part of this data line adopts convex structure.

12. reflective LCD device as claimed in claim 6 is characterized in that: this data line adopts rectilinear structure.

13. reflective LCD device, infrabasal plate, a liquid crystal layer, a public electrode, a plurality of pixel electrode and that it comprises a upper substrate, be oppositely arranged with upper substrate are positioned at the reflection horizon on the infrabasal plate, this liquid crystal layer is between upper substrate and infrabasal plate, between the substrate and liquid crystal layer of this public electrode in upper substrate and infrabasal plate, this pixel electrode is arranged between public electrode and the liquid crystal layer, it is characterized in that: form an edge electric field between pixel electrode and public electrode, and this pixel electrode is a S shape structure.

14. reflective LCD device as claimed in claim 13 is characterized in that: this surface, reflection horizon has some projectioies.

15. reflective LCD device as claimed in claim 13, it is characterized in that: it further comprises a plurality of gate lines and data line, a plurality of thin film transistor (TFT)s, this liquid crystal layer is between upper substrate and infrabasal plate, gate line and data line are formed on the substrate in upper substrate and the infrabasal plate, it constitutes a plurality of pixel regions, its grid of this thin film transistor (TFT) is connected with gate line, source electrode is connected with data line, this public electrode is between the substrate and liquid crystal layer that form gate line and data line, this pixel electrode is between public electrode and liquid crystal layer, and the drain electrode of this pixel electrode and thin film transistor (TFT) has and is electrically connected.

16. reflective LCD device as claimed in claim 15 is characterized in that: this surface, reflection horizon has some projectioies.

17. reflective LCD device as claimed in claim 15 is characterized in that: at least one part of this data line adopts convex structure.

18. reflective LCD device as claimed in claim 15 is characterized in that: this data line adopts rectilinear structure.