CN2689278Y - Liquid-crystal displaying devices - Google Patents

Abstract

The utility model provides a liquid-crystal displaying device, comprising a first transparent basal plate, a second transparent basal plate, two polarizing slices, a plurality of pixel electrodes and common electrodes. A liquid crystal layer is arranged between the first transparent basal plate and the second transparent basal plate. The pixel electrodes and the common electrodes are arranged on the first transparent basal plate. The two polarizing slices are respectively arranged on the first transparent basal plate and the second transparent base plate. At least one polarizing slice is arranged on the inner surface of a relevant basal plate.

Description

LCD

[technical field]

The utility model is about a kind of LCD, particularly about a kind of plane inner switching type (In-Plane Switching, IPS) LCD.

[background technology]

LCD because have low diathermaneity, characteristics such as volume is frivolous and power consumption is low, so day by day extensive on using, and along with the ripe and innovation of correlation technique, its kind is also various day by day.

Usually when the user watched LCD from different perspectives, the contrast of image can reduce along with the increase of viewing angle, the visual angle defective of LCD that Here it is.Be twisted nematic (the Twisted Nematic that overcomes early stage appearance, TN) and super-twist nematic (Super Twisted Nematic, STN) there is the narrow defective in visual angle in LCD, HIT (Hitachi) takes the lead in proposing a kind of plane inner switching type (In-Plane SwitchingMode, wide-angle liquid crystal display IPS).This kind plane inner switching type LCD and traditional twisted nematic, super-twist nematic liquid crystal display difference are: its public electrode and pixel electrode are arranged on the same substrate, utilize the electric field that is parallel to substrate that produces between public electrode and the pixel electrode that liquid crystal molecule is rotated being parallel on the plane of substrate, thereby possess wide viewing angle and the fast characteristic of liquid crystal molecule response speed.

Seeing also Fig. 1, is a kind of structural representation of prior art plane inner switching type LCD.This LCD 1 comprises that two relative first transparency carriers 10 and second transparency carrier 20, are arranged on the liquid crystal layer 30 between this first transparency carrier 10 and second transparency carrier 20.A plurality of public electrodes 11, a transparent insulating layer 12, a plurality of pixel electrode 13 are arranged on the inner surface of this first transparency carrier 10, and first alignment film 14 is arranged on this transparent insulating layer 12.One colored filter 25 and second alignment film 24 are arranged on the inner surface of second transparency carrier 20 in regular turn, and the mutually perpendicular polaroid 40,41 in a pair of polarization direction is attached to the outer surface of transparency carrier 10,20 respectively.

The polaroid the 40, the 41st that this LCD 1 adopts, ordinary light polarization-type polaroid (Ordinary Type Polarizer), the polarized light property of this kind ordinary light polarization-type polaroid is: the incident light of ordinary polarization state can pass; When passing, the incident light of extraordinary polarization state will be absorbed.The main material of this polaroid 40,41 is that (Polyvinyl Alcohol PVA), because the PVA resistance to elevated temperatures is relatively poor, be no more than 80 ℃ usually, so this display device is not suitable for using polyvinyl alcohol (PVA) under the environment of higher temperature; And this polaroid the 40, the 41st is attached to the outer surface of transparency carrier 10,20, very easily by scratch.And in the reality, the two ordinary light polarization-type polaroids that use is orthogonally set 40,41 o'clock, the contrast of image can sharply reduce (as shown in Figure 2) along with the increase of viewing angle, thereby produces angle limitations; And, the two ordinary light polarization-type polaroids that use is orthogonally set 40,41 o'clock, this LCD 1 is spent angles, 270 degree angles and its near zone light leak comparatively serious (seeing also the light areas of Fig. 3) in 0 degree angle, an angle of 90 degrees, 180, influences image displaying quality.This two polaroid 40,41 adopts the outer set-up mode that pastes, polarized light through polaroid 40 effect back gained needs can arrive another polaroid 41 earlier behind this colored filter 25, the polarized light that 25 pairs of colored filters pass wherein can produce certain scattering process, thereby formed polarized light after polaroid 40 effect damaged, reduce the polarisation efficient and the light transmittance of LCD 1, influence its image displaying quality.

[utility model content]

In order to overcome the not good defective of prior art plane inner switching type LCD image displaying quality, the utility model provides a kind of LCD with plane inner switching type of good display quality.

The utility model provides the LCD of plane inner switching type, it comprises one first transparency carrier, one second transparency carrier, two polaroids, a plurality of pixel electrode and public electrode, this liquid crystal layer is arranged between this first transparency carrier and this second transparency carrier, these a plurality of pixel electrodes and public electrode are arranged on this first transparency carrier, this two polaroid is separately positioned on this first transparency carrier and second transparency carrier, and at least one polaroid is arranged on the inner surface of corresponding substrate.

Two polaroids of LCD of the present utility model all adopt extraordinary ray polarization-type polaroid, and this two polaroid all is arranged on the inner surface of corresponding substrate; Perhaps adopt the collocation of an extraordinary ray polarization-type polaroid and an ordinary light polarization-type polaroid to use, wherein this extraordinary ray polarization-type polaroid is arranged on the inner surface of corresponding substrate.

Compared with prior art, LCD of the present utility model has following advantage: polaroid adopts the set-up mode that is built in corresponding substrate inboard, is difficult for by scratch; Emergent light just enters colored filter after through two polaroid effects, therefore eliminates the destruction that colored filter causes polarized light, improves the polarisation efficient and the light transmittance of LCD; And at least one polaroid is an extraordinary ray polarization-type polaroid, the chemically-resistant solvent, and heat resisting temperature reaches 200 ℃, makes LCD all can obtain higher contrast in bigger angular field of view, effectively improves its image displaying quality.

When built-in extraordinary ray polarization-type polaroid and the collocation of ordinary light polarization-type polaroid are used, because the extraordinary ray polarization-type polaroid that is orthogonally set and the optical axis of ordinary light polarization-type polaroid are orthogonal, light leak to incident light wave be able to be complementary, the light leakage phenomena of LCD in scope with great visual angle can be effectively compensated, the image displaying quality of LCD can be further promoted.

[description of drawings]

Fig. 1 is the diagrammatic cross-section of prior art LCD, and wherein two polaroids are outer being attached on the outer surface of corresponding substrate.

Fig. 2 is the contrast response curve synoptic diagram of the ordinary light polarization-type polaroid of prior art LCD in the different visual angles scope.

Fig. 3 is the light leak characteristic synoptic diagram of the ordinary light polarization-type polaroid of prior art LCD.

Fig. 4 is the structural representation of the utility model LCD first embodiment.

Fig. 5 is the contrast response curve synoptic diagram of the extraordinary ray polarization-type polaroid of the utility model LCD in the different visual angles scope.

Fig. 6 is the structural representation of the utility model LCD second embodiment.

Fig. 7 is the structural representation of the utility model LCD the 3rd embodiment.

Fig. 8 is the light leak characteristic synoptic diagram of the extraordinary ray polarization-type polaroid of the utility model LCD.

[embodiment]

Fig. 4 is the structural representation of the utility model LCD first embodiment, this LCD 100 comprise one first transparency carrier 110, one and second transparency carrier 120, that is oppositely arranged of this first transparency carrier 110 be arranged on liquid crystal layer 130 between this two substrates 110,120.

These first transparency carrier, 110 inner surfaces are provided with a plurality of public electrodes 111, a transparent insulating layer 112, a plurality of pixel electrode 113, first polaroid 141 and first both alignment layers 116.Be sequentially provided with a colored filter 127, second polaroid 143 and second both alignment layers 126 on these second transparency carrier, 120 inner surfaces.

This public electrode 111 and pixel electrode 113 are vertical bar shape transparency electrodes that parallel interval is provided with, all attached on this first transparency carrier 110, it all adopts transparent conductive material to make, as tin indium oxide (Indium Tin Oxide, ITO) or indium zinc oxide (Indium ZincOxide, IZO) etc.

This insulation course 112 is transparent insulation resin materials, and it makes this public electrode 111 and pixel electrode 113 keep insulation attached on this public electrode 111 and the pixel electrode 113.This first polaroid 141 and this first both alignment layers 116 are successively attached on this insulation course 112.When applying a driving voltage, can produce an electric field with level (plane that is parallel to substrate) direction between this public electrode 111 and the pixel electrode 113, this electric field can make the liquid crystal molecule of liquid crystal layer 130 rotate in surface level.

This first polaroid 141 and second polaroid 143 are the quadrature setting, and both polarization directions are vertical mutually.This two polaroid 141,143 is extraordinary ray polarization-type polaroid (Extraor dinary Type Polarizer), it is made by the organic dyestuff with liquid crystal phase (Liquid-crystallinePhase), its polarized light property is: the incident light of extraordinary polarization state can pass this polaroid 141,143, and the incident light of ordinary polarization state passes this polaroid and will be absorbed in 141,143 o'clock.The thickness of this two polaroid 141,143 is generally less than 100 microns, and thinner thickness is not so when being separately positioned on corresponding substrate 110,120 inner surfaces, can cause harmful effect to the operating voltage of LCD 100.

Please consult Fig. 2 and Fig. 5 simultaneously, Fig. 5 is the contrast response curve synoptic diagram of the LCD of the extraordinary ray polarization-type polaroid that adopts of the utility model in the different visual angles scope, and it is less that this curve display goes out the amplitude of variation of the utility model LCD 100 (-50 degree are to+50 degree approximately) its contrast in scope with great visual angle.Compare as can be known at the contrast response curve of different visual angles scope with the LCD of employing ordinary light polarization-type polaroid shown in Figure 2 from this curve, the ordinary light polarization-type polaroid that LCD 100 of the present utility model adopts built-in extraordinary ray polarization-type polaroid 141,143 to replace traditional external labeling type has following advantage: when using extraordinary ray polarization-type polaroid, compare traditional ordinary light polarization-type polaroid, it all can obtain higher contrast in bigger angular field of view, thereby promotes the display quality of its image.

This polaroid 143 is arranged between the liquid crystal layer 130 and colored filter 127 of corresponding substrate 120 inboards, can eliminate the destruction and the scattering of 127 pairs of polarized lights of colored filter, improve polarisation efficient and light transmittance, thereby can further improve the image displaying quality of LCD 100; And adopt the set-up mode that is built in corresponding substrate inboard, this two polaroid 141,143 is difficult for by scratch.In addition, traditional general heat resisting temperature of ordinary light polarization-type polaroid only is 80 ℃, non-refractory, and extraordinary ray polarization-type polaroid 141,143 heat resisting temperatures that the utility model adopts are 200 ℃, more high temperature resistant and chemically-resistant solvent; And itself thinner thickness of extraordinary ray polarization-type polaroid 141,143 makes this LCD 100 more frivolous.In the processing procedure of this LCD 100, can directly two polaroids 141,143 be plated on the corresponding substrate 110,120, can save tradition and adopt a large amount of artificial outer costs that paste polaroid.

Seeing also Fig. 6, is the structural representation of the utility model LCD second embodiment.The improvement design that this LCD 200 is LCD 100, it can further improve the image displaying quality of LCD 100.This LCD 200 is with the difference of LCD 100: it adopts an ordinary light polarization-type polaroid 243 to replace the extraordinary ray polarization-type polaroid 143 of LCD 100.Wherein, this extraordinary ray polarization-type polaroid 241 is arranged on first transparency carrier, 210 inner surfaces, and this ordinary light polarization-type polaroid 243 is arranged on the outer surface of second transparency carrier 220.

Seeing also Fig. 7, is the structural representation of the utility model LCD the 3rd embodiment.This LCD 300 also comprises an extraordinary ray polarization-type polaroid 341 and an ordinary light polarization-type polaroid 343.This LCD 300 is with the difference of LCD 100: it adopts an ordinary light polarization-type polaroid 343 to replace the extraordinary ray polarization-type polaroid 143 of LCD 100.Wherein, this extraordinary ray polarization-type polaroid 341 is arranged on second transparency carrier, 320 inner surfaces, and this ordinary light polarization-type polaroid 343 is arranged on the outer surface of first transparency carrier 310.

Please consult Fig. 3 and Fig. 8 simultaneously, Fig. 8 is the light leak characteristic synoptic diagram of the LCD 100 of the utility model extraordinary ray polarization-type polaroid of adopting two mutual quadratures, adopt the liquid crystal display device light leakage characteristic schematic images of two mutual quadrature ordinary light polarization-type polaroids to compare with Fig. 3, adopt the optical axis of mutually orthogonal extraordinary ray polarization-type polaroid and ordinary light polarization-type polaroid orthogonal as can be known, extraordinary ray polarization-type polaroid can be complementary to the light leak of any angle incident light wave with combining of ordinary light polarization-type polaroid, thereby the utility model second, the LCD 200 of the 3rd embodiment, an extraordinary ray polarization-type polaroid 241 is used in collocation in 300,341 and one ordinary light polarization-type polaroid 243,343 o'clock, can significantly be reduced in the interior light leak amplitude of scope with great visual angle, further improve the image displaying quality of LCD.

In addition, polaroid 241,243,341,343 in the LCD 200,300 also can adopt two extraordinary ray polarization-type polaroids entirely, wherein, one extraordinary ray polarization-type polaroid is arranged on the inner surface of corresponding substrate, and another extraordinary ray polarization-type polaroid then is arranged on the outer surface of corresponding substrate.The pixel electrode 113 of LCD 100,200,300 also can be herring-bone form or the design of other bending shape.

Claims (10)

1. LCD, it comprises one first transparency carrier, one second transparency carrier, two polaroids, a plurality of pixel electrode and public electrode, this liquid crystal layer is arranged between this first transparency carrier and this second transparency carrier, these a plurality of pixel electrodes and public electrode are arranged on this first transparency carrier, this two polaroid is separately positioned on this first transparency carrier and second transparency carrier, it is characterized in that: at least one polaroid is arranged on the inner surface of corresponding substrate.

2. LCD as claimed in claim 1 is characterized in that: this two polaroid all is extraordinary ray polarization-type polaroids.

3. LCD as claimed in claim 2 is characterized in that: this two polaroid all is arranged on the inner surface of corresponding substrate.

4. LCD as claimed in claim 1 is characterized in that: this two polaroid comprises an extraordinary ray polarization-type polaroid and an ordinary light polarization-type polaroid.

5. LCD as claimed in claim 4 is characterized in that: this extraordinary ray polarization-type polaroid is arranged on the inner surface of corresponding substrate.

6. LCD as claimed in claim 1 is characterized in that: between this first transparency carrier and this liquid crystal layer both alignment layers is set.

7. LCD as claimed in claim 1 is characterized in that: between this second transparency carrier and this liquid crystal layer both alignment layers is set.

8. LCD as claimed in claim 7 is characterized in that: between this second transparency carrier and this both alignment layers colored filter is set.

9. LCD as claimed in claim 1 is characterized in that: this pixel electrode is a vertical bar shaped.

10. LCD as claimed in claim 1 is characterized in that: this pixel electrode is crooked shape.

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