CN2735392Y

CN2735392Y - Active matrix type liquid crystal display device

Info

Publication number: CN2735392Y
Application number: CN 200420083695
Authority: CN
Inventors: 谢朝桦; 彭家鹏; 陈鹊如
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Innolux Corp
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Innolux Corp
Priority date: 2004-08-31
Filing date: 2004-08-31
Publication date: 2005-10-19
Anticipated expiration: 2014-08-31

Abstract

The utility model provides an active matrix type liquid crystal display device, comprising a first substrate, a second substrate, a liquid crystal layer which is positioned between the first substrate and the second substrate, and a plurality of sharing electrodes and pixel electrodes which are arranged on the second substrate. The first substrate and the second substrate are arranged in a relative mode, and the sharing electrodes and the pixel electrodes are annular electrodes. Adopting the annular sharing electrodes and the annular pixel electrodes, two electric fields which are orthogonal and are parallel to the two substrates can be generated in applying voltage. Under the effect of the two electric fields, the liquid crystal molecule can orientate the two orthogonal directions, obtaining broader visual angle.

Description

Active array type LCD

[technical field]

The utility model relates to a kind of liquid crystal indicator, relates in particular to a kind of active array type LCD.

[background technology]

Liquid crystal in the LCD itself is not had a characteristics of luminescence, is to adopt the electric field controls liquid crystal molecule to reverse and realize passing through or not passing through of light, thereby reaches the purpose of demonstration.In conventional liquid crystal, form electrode respectively on the surface of two substrate of glass that are oppositely arranged, producing the electric field that the control liquid crystal molecule reverses, and the electrode of two substrates is oppositely arranged, thereby can produce the electric field perpendicular with substrate surface.Because conventional liquid crystal generally adopts the eurymeric liquid crystal, thereby under the control of this electric field, liquid crystal molecular orientation will be perpendicular to substrate surface, but because the influence of physical force such as interaction force between liquid crystal molecule and gravity, make that the orientation of liquid crystal molecule can not be fully perpendicular to substrate surface, thereby will have influence on the display effect of LCD.

A kind of prior art liquid crystal indicator such as Fig. 1, Fig. 2 and shown in Figure 3, this liquid crystal indicator 1 comprises first substrate 11 and second substrate 12 that is oppositely arranged, one liquid crystal layer 17 that between this first substrate 11 and second substrate 12, constitutes by a plurality of liquid crystal molecules 171, two lay respectively at this first substrate 11 and second substrate 12 and liquid crystal layer 17 different sides and the orthogonal polarizing appliance 110 of polarizing axis and 120, one is arranged on the colored filter 19 in the substrate 11, adjacent with liquid crystal layer 17 and be used to control the both

alignment layers

101 and 102 of liquid crystal molecule 171 initial orientations, the pixel cell 10 that is arranged on the spaced walls 170 between two

substrates

11 and 12 and forms by orthogonal source signal line 13 and gate line 14, this pixel cell 10 comprises a plurality of common electrode 15 and pixel electrodes 16 that are parallel to each other and are provided with at interval, and this common electrode 15 and pixel electrode 16 are parallel to gate line 14 and are provided with.

Wherein, this both alignment layers 101 is identical with the polarizing axis direction of 102 orientation and polarizing appliance 120, have at least one to be to adopt transparent material to make in this first substrate 11 and second substrate 12, this liquid crystal layer 17 is to adopt to row (Nematic) type liquid crystal to make, and this liquid crystal indicator 1 is realized colored the demonstration by colored filter 19.

Please consulting Fig. 2 once more, is not during making alive, the synoptic diagram of this liquid crystal indicator 1 duty of living in.Under this state, owing to be not subjected to electric field action, then the orientation of this liquid crystal molecule 171 is identical with the orientation of both

alignment layers

101 and 102, and this both alignment layers 101 is parallel with the polarizing axis of polarizing appliance polarizing appliance 120 with 102 orientation, therefore, the linearly polarized light that enters liquid crystal layer through polarizing appliance 120 just in time can pass through liquid crystal layer, and polarization state does not change.Again because, polarizing appliance 110 is vertical mutually with 120 polarizing axis, so this linearly polarized light can not pass through polarizing appliance 110, promptly this liquid crystal indicator 1 is in dark attitude.

Please consult Fig. 3 once more, when being making alive, the synoptic diagram of this liquid crystal indicator 1 duty of living in.This common electrode 15 forms the electric field 18 that is basically parallel to first substrate 11 and second substrate 12 with pixel electrode 16, because having positive electricity, liquid crystal molecule 171 leads anisotropy, so under electric field 18 effects, the orientation of this liquid crystal molecule 17 is consistent with the direction of this electric field 18, but, because there are certain angle in the direction of electric field 18 and the polarizing axis of polarizing appliance 120, therefore will produce birefringence during the linearly polarized light arrival liquid crystal layer 17 by polarizing appliance 120, thereby this linear polarization polarization state of light will change.Yet this polarizing appliance 110 is vertical mutually with 120 polarizing axis, so the part component of this linearly polarized light will be by polarizing appliance 110, promptly this liquid crystal indicator 1 is in bright attitude.

As mentioned above, this employing is parallel to the method that the electric field controls liquid crystal molecule of substrate reverses and is called " in-plane changes method " (In P1ane Switching, IPS), should " in-plane changes method " be used for active array type LCD, and adopt the liquid crystal indicator 1 of this method to have broader visual angle than traditional liquid crystal indicator.

During making alive, this common electrode 15 and pixel electrode 16 only can form the electric field 18 that is parallel to first substrate 11 and second substrate 12 of a certain direction, liquid crystal molecule 171 is subjected to the effect of electric field 18, its major axis only can be oriented in the direction of this electric field 18, thereby, enlarged at the visual angle of the direction of this electric field 18; But because liquid crystal molecule 171 only is oriented in the direction of this electric field 18, thereby on the direction vertical with this electric field 18, the visual angle does not improve yet, so still there is certain visual angle defective in this liquid crystal indicator 1.

[utility model content]

In order to overcome the visual angle defective that the prior art liquid crystal indicator exists, the utility model provides a kind of visual angle broader active array type LCD.

The technical scheme that the utility model technical solution problem is adopted is: a kind of active array type LCD is provided, it comprises liquid crystal layer that first substrate that is oppositely arranged and second substrate, be positioned at this first substrate and second substrate, is arranged on this second suprabasil this common electrode and pixel electrode, wherein, this common electrode and pixel electrode all are ring electrodes.

Another technical scheme that the utility model technical solution problem is adopted is: a kind of active array type LCD is provided, it comprises first substrate that is oppositely arranged and second substrate, one liquid crystal layer between this first substrate and second substrate and is arranged on this second suprabasil common electrode and pixel electrode, first transparency electrode that links to each other with common electrode and second transparency electrode that links to each other with pixel electrode, wherein, this first transparency electrode and second transparency electrode all are ring electrodes.

Compared with prior art, in the active array type LCD that the utility model provides, this common electrode and pixel electrode are that ring electrode or first transparency electrode and second transparency electrode are ring electrode, thereby, during making alive, can form the electric field of the both direction that is parallel to this first substrate of both direction at least between this common electrode and the pixel electrode or between first transparency electrode and second transparency electrode, therefore, under electric field action, liquid crystal molecule can be oriented at least on the both direction, thereby make that the visual angle of both direction is all enlarged at least, so this active array type LCD has broad visual angle.

In addition, in a kind of active array type LCD that the utility model also provides, this first transparency electrode and second transparency electrode can be arranged on same one deck of this second substrate, promptly this first transparency electrode and the second transparency electrode spacing are less, thereby under the same drive voltage, the active strength of the electric field that forms between this first transparency electrode and second transparency electrode is bigger, so this active array type LCD also can reduce the response time of liquid crystal.

[description of drawings]

Fig. 1 is a kind of structural representation of a pixel cell of prior art liquid crystal indicator.

The synoptic diagram of duty of living in when Fig. 2 is the not making alive of liquid crystal indicator shown in Figure 1.

The synoptic diagram of duty of living in when Fig. 3 is the making alive of liquid crystal indicator shown in Figure 1.

Fig. 4 is the structural representation of a pixel cell of the utility model active array type LCD first embodiment.

The synoptic diagram of duty of living in when Fig. 5 is the making alive of active array type LCD shown in Figure 4.

Fig. 6 is the structural representation of a pixel cell of the utility model active array type LCD second embodiment.

The synoptic diagram of duty of living in when Fig. 7 is the making alive of active array type LCD shown in Figure 6.

[embodiment]

First embodiment of the utility model active array type LCD such as Fig. 4 and shown in Figure 5, this liquid crystal indicator 2 comprise first substrate 21 and second substrate 22 that is oppositely arranged, one is positioned at the liquid crystal layer 27 between this two substrate, two lay respectively at this first substrate 21 and second substrate, 22 inboards and the orthogonal polarizing appliance 210 of polarizing axis and 220, one is arranged on the colored filter 29 in the substrate 21, one is arranged on the insulation course 221 of these second substrate, 22 contiguous liquid crystal layer 27 1 sides, one is arranged on the passivation layer 222 of these insulation course 221 contiguous liquid crystal layer 27 1 sides, one is adjacent with liquid crystal layer 27 and be used to control the both alignment layers 202 of liquid crystal molecule 271 orientations, be arranged on the spaced walls 270 between two substrates 21 and 22.

This liquid crystal indicator 2 also comprises the source signal line 23 and gate line 24 that is vertically set on mutually in second substrate 22, this source signal line 23 intersects formation pixel cell 20 with gate line 24, this pixel cell 20 comprises a plurality of common electrodes 25 and pixel electrode 26, wherein, this common electrode 25 is arranged in this insulation course 221, this pixel electrode 26 is arranged in this passivation layer 222, and this common electrode 25 and pixel electrode 26 be rectangle in the form of a ring all, and is parallel to each other and is provided with at interval.

As mentioned above, when making alive, this common electrode 25 and pixel electrode 26 between form the horizontal component of electric field 281 and 282 be parallel to this first substrate 21 and second substrate 22, and this electric field 281 is vertical mutually with 282 direction of an electric field, the distribution of this electric field 282 as shown in Figure 5, on the direction vertical with this electric field 282, the distributional class of this electric field 281 is similar to electric field 282.Therefore, under electric field 281 and 282 effects, liquid crystal molecule 271 parts will be oriented in the direction of electric field 281, another part will be oriented in the direction of electric field 282, thereby make that the visual angle on electric field 281 and 282 two the orthogonal directions is all enlarged, so this liquid crystal indicator 2 is compared with liquid crystal indicator 1, has broad visual angle.

The liquid crystal molecule 271 of this liquid crystal layer 27 is nematic crystals, has at least one to be to adopt transparent material to make in this first substrate 21 and second substrate 22, and this common electrode 25 is that (Indium Tin Oxide ITO) makes the employing tin indium oxide with pixel electrode 26.In addition, this common electrode 25 and pixel electrode 26 also can adopt zinc-tin oxide (Indium Zinc Oxide, IZO) or metallic conduction materials such as gold, silver, copper make.

Second embodiment of the utility model active array type LCD such as Fig. 6 and shown in Figure 7, this liquid crystal indicator 3 comprise first substrate 31 and second substrate 32 that is oppositely arranged, one is positioned at the liquid crystal layer 37 between this two substrate, two lay respectively at this first substrate 31 and second substrate 32 and liquid crystal layer 37 different sides and the orthogonal polarizing appliance 310 of polarizing axis and 320, one is arranged on the colored filter 39 in the substrate 31, adjacent with liquid crystal layer 37 and be used to control the both

alignment layers

301 and 302 of liquid crystal molecule 371 orientations, be vertically set on source signal line 33 and gate line 34 in second substrate mutually, be arranged on the spaced walls 370 of 32 of first substrate 31 and second substrates.

This source signal line 33 intersects and the pixel cell 30 of formation with gate line 34, this pixel cell 30 comprises the common electrode 35 and pixel electrode 36, a plurality of first transparency electrode 351 that links to each other with common electrode 35 and a plurality of second transparency electrodes 361 that link to each other with pixel electrode 36 that is arranged in parallel, these first transparency electrode, 351 utmost points and second transparency electrode 361 are parallel to each other and are disposed on same one deck of this second substrate 32, and this first transparency electrode 351 and second transparency electrode 361 all are the ring-type rectangles.

As mentioned above, this first transparency electrode 351 links to each other with pixel electrode 36 with common electrode 35 respectively with second transparency electrode 361, and this first transparency electrode 351 and second transparency electrode 361 all are " mouth " shape.Thereby, the distribution of this electric field 382 as shown in Figure 7, on the direction vertical with this electric field 382, the distributional class of this electric field 381 is similar to electric field 382.When making alive, 361 formation with second transparency electrode of this first transparency electrode 351 are parallel to the horizontal component of electric field 381 and 382 of this first substrate 31 and second substrate 32, and this electric field 381 is vertical mutually with 382 direction of an electric field, therefore, under electric field 381 and 382 effects, liquid crystal molecule 371 parts will be oriented in the direction of this electric field 381, another part will be oriented in the direction of this electric field 382, thereby, the visual angle of electric field 381 and 382 orthogonal both directions is all enlarged, so this liquid crystal indicator 3 is compared with liquid crystal indicator 1, has broad visual angle.

Again because this first transparency electrode 351 and second transparency electrode 361 are arranged on same one deck of this second substrate 32, promptly the spacing of this first transparency electrode 351 and second transparency electrode 361 is less, thereby, under the same drive voltage, this electric field 381 and 382 active strength be greater than the intensity of electric field 281 in the liquid crystal indicator 2 and 282, so, under this electric field 381 and 382 effects, the velocity of rotation of liquid crystal molecule 371 is faster, and then, the response time that can reduce this liquid crystal indicator 3.

In addition, public electrode 25 can be other ring electrodes with pixel electrode 26, and first transparency electrode 351 and second transparency electrode 361 can be other ring electrodes.Because public electrode 25 and pixel electrode 26 are that ring electrode or first transparency electrode 351 and second transparency electrode 361 are ring electrodes, when applying voltage, liquid crystal indicator 2 of the present invention and 3 all can produce the electric field that is parallel to first substrate 21 or first substrate 31 of both direction at least, liquid crystal molecule also can deflect to this at least on the both direction, thereby can improve the visual angle defective of both direction at least, so, as long as public electrode 25 is that the ring electrode or first transparency electrode 351 are ring electrodes with second transparency electrode 361 with pixel electrode 26, liquid crystal indicator 2 of the present invention and 3 all can obtain the visual angle than broadness.

But it is described that the utility model active array type LCD is not limited to above-mentioned embodiment, and for example: one of first transparency electrode 351 and second transparency electrode 361 are to adopt tin indium oxide or zinc-tin oxide to make; First substrate 21 and second substrate 22 can adopt glass or silicon dioxide to make; Insulation course 221 can adopt insulating material such as monox or silicon nitride to make; Both alignment layers both can be arranged on the inboard of two substrates simultaneously, also can only be arranged on a substrate inboard etc.

Claims

1. active array type LCD, it comprise first substrate that is oppositely arranged and second substrate, between this first substrate and second substrate liquid crystal layer and be arranged on this second suprabasil common electrode and pixel electrode, it is characterized in that: this common electrode and pixel electrode all are ring electrodes.

2. active array type LCD as claimed in claim 1 is characterized in that: this common electrode and pixel electrode are rectangular electrodes.

3. active array type LCD as claimed in claim 1 is characterized in that: one of this common electrode and pixel electrode are made of tin indium oxide.

4. active array type LCD as claimed in claim 1 is characterized in that: one of this common electrode and pixel electrode are made of indium zinc oxide.

5. active array type LCD as claimed in claim 1 is characterized in that: one of this common electrode and pixel electrode are made of metal conductive materials.

6. active array type LCD, it comprises liquid crystal layer between this first substrate and second substrate of first substrate that is oppositely arranged and second substrate,, is arranged on second suprabasil common electrode and the pixel electrode, it is characterized in that: further comprise first transparency electrode that links to each other with this common electrode and second transparency electrode that links to each other with this pixel electrode, this first transparency electrode and second transparency electrode all are ring electrodes.

7. active array type LCD as claimed in claim 6 is characterized in that: this first transparency electrode and second transparency electrode are rectangular electrodes.

8. active array type LCD as claimed in claim 6 is characterized in that: this first transparency electrode and second transparency electrode are arranged on same one deck of second substrate.

9. active array type LCD as claimed in claim 9 is characterized in that: one of this first transparency electrode and second transparency electrode are made of tin indium oxide.

10. active array type LCD as claimed in claim 9 is characterized in that: one of this first transparency electrode and second transparency electrode are made of indium zinc oxide.