CN1746754A - Plane inner switching type liquid crystal displaying apparatus - Google Patents
Plane inner switching type liquid crystal displaying apparatus Download PDFInfo
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- CN1746754A CN1746754A CN 200410051494 CN200410051494A CN1746754A CN 1746754 A CN1746754 A CN 1746754A CN 200410051494 CN200410051494 CN 200410051494 CN 200410051494 A CN200410051494 A CN 200410051494A CN 1746754 A CN1746754 A CN 1746754A
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Abstract
The present invention discloses a kind of plane inner switching type liquid crystal displaying apparatus, comprise that the liquid crystal layer, two that two upper substrates that are provided with relatively and infrabasal plate, are sandwiched between upper substrate and the infrabasal plate is separately positioned on the last polaroid of upper substrate and infrabasal plate and the last alignment film and following alignment film that following polaroid, a plurality of pixel electrode and common electrode and two are separately positioned on upper substrate and infrabasal plate inboard, should go up alignment film and roughly become 90 degree, form the liquid crystal layer of a twisted nematic with the frictional direction of following alignment film.
Description
[technical field]
The invention relates to a kind of liquid crystal indicator, particularly about a kind of plane inner switching type liquid crystal displaying apparatus (In Plane Switching Liquid Crystal Display, IPSLCD).
[background technology]
In numerous dissimilar liquid crystal indicators, (TwistedNematic, TN) the type liquid crystal indicator is widely used because having the advantage of low driving voltage and low energy consumption twisted-nematic.Common twisted nematic liquid crystals display device comprises two relative transparency carriers and is sandwiched in wherein liquid crystal layer, the wherein major axis of the liquid crystal molecule of liquid crystal layer and this two transparency carriers almost parallel, and the liquid crystal molecule of this two transparency carriers surface becomes 90 ° of aligned twisted.But when vergence direction was watched, more serious light leakage phenomena can appear in this twisted nematic liquid crystals display device, caused its visual angle narrow and small, so the twisted nematic liquid crystals display device can not satisfy the needs that wide-angle is watched.
In order to solve the little defective in common twisted nematic liquid crystals display device visual angle, FDAC (Hitachi) company proposes a kind of plane inner switching type liquid crystal displaying apparatus, and it has bigger visual angle.
Seeing also Fig. 1, is a kind of schematic perspective view of prior art plane inner switching type liquid crystal displaying apparatus.This plane inner switching type liquid crystal displaying apparatus 100 comprises an infrabasal plate 12, one upper substrates 11 and is clipped in wherein a liquid crystal layer 15.On one polaroid 13 and once polaroid 14 be separately positioned on the outside of this upper substrate 11 and infrabasal plate 12.Pixel electrode 16 and common electrode 17 are arranged on the inboard of this infrabasal plate 12, and wherein this pixel electrode 16 is transparency electrodes of strip with common electrode 17, are parallel to each other and are spaced.Alignment film on one (figure do not show) and once alignment film (figure does not show) be separately positioned on the inboard of this upper substrate 11 and infrabasal plate 12, this time alignment film covers this pixel electrode 16 and common electrode 17, wherein, the frictional direction of upper and lower alignment film is opposite, and the major axis of the liquid crystal molecule 18 at close this two alignment films place is roughly parallel to upper and lower base plate 11,12.Last polaroid 13 is orthogonal with the polarization axle of following polaroid 14, when not applying voltage, the major axis of liquid crystal molecule 18 and pixel electrode 16 and common electrode 17 have an angle, the light that sends from backlight (figure do not show) is by behind the liquid crystal layer 15, its polarization state and polarization direction can not change, light is absorbed by last polaroid 13 and can not pass through, and this moment, this plane inner switching type liquid crystal displaying apparatus 100 showed dark attitude.
See also Fig. 2, when applying voltage between pixel electrode 16 and common electrode 17, will produce an electric field E1 who is parallel to infrabasal plate 12, the direction of this electric field E1 is perpendicular to pixel electrode 16 and common electrode 17.Under the effect of this electric field E1, the major axis of liquid crystal molecule 18 is towards the direction deflection that is parallel to electric field E1, the optical delay of liquid crystal layer 15 changes, be transformed into elliptically polarized light or circularly polarized light from the linearly polarized light of down polaroid 14 outgoing after by liquid crystal layer 15, so light can pass polaroid 13, this moment, this plane inner switching type liquid crystal displaying apparatus 100 showed bright attitude, thereby realized the purpose that image shows.
But, because liquid crystal molecule 18 is not arranged along same direction when applying voltage, each liquid crystal molecule 18 all needs the identical amplitude of deflection after applying voltage, to reach the state parallel with electric field E1, cause the response speed of this plane inner switching type liquid crystal displaying apparatus 100 slow, thereby influence image display effect.In addition, because this plane inner switching type liquid crystal displaying apparatus 100 is to utilize the birefringence principle of liquid crystal molecule 18 to realize showing purpose, when the thickness of liquid crystal layer 15 changes, its phase delay also changes, influence light by the polarization state behind the liquid crystal layer 15, thereby influence the display effect of this plane inner switching type liquid crystal displaying apparatus 100.That is to say that the thickness error allowed band of liquid crystal layer 15 is less, in panel manufacturing process, processing procedure is had relatively high expectations, thereby it is low to cause producing yield.
[summary of the invention]
Slowly reach and produce the low defective of yield for solving prior art plane inner switching type liquid crystal displaying apparatus response speed, the invention provides that a kind of response speed is fast, to produce yield high and have a plane inner switching type liquid crystal displaying apparatus of wide viewing angle.
The technical scheme that technical solution problem of the present invention is adopted is: a kind of plane inner switching type liquid crystal displaying apparatus is provided, comprise that the liquid crystal layer, two that two upper substrates that are provided with relatively and infrabasal plate, are sandwiched between upper substrate and the infrabasal plate is separately positioned on the last polaroid of upper substrate and infrabasal plate and the last alignment film and following alignment film that following polaroid, a plurality of pixel electrode and common electrode and two are separately positioned on upper substrate and infrabasal plate inboard, should go up alignment film and roughly become 90 degree, form the liquid crystal layer of a twisted nematic with the frictional direction of following alignment film.
Compared to prior art, in the plane inner switching type liquid crystal displaying apparatus of the present invention, liquid crystal layer is a twisted nematic, at pixel electrode when the electricity consumption interpolar applies certain voltage together, liquid crystal molecule is towards being parallel to direction of an electric field deflection, because last alignment film roughly becomes 90 ° with the frictional direction of following alignment film, liquid crystal molecule in the liquid crystal layer is 90 ° of aligned twisted, the time weak point that the liquid crystal molecule of all liquid crystal molecules required time ratio prior art plane inner switching type liquid crystal displaying apparatus when electric field action is issued to same state is required is so plane inner switching type liquid crystal displaying apparatus of the present invention has response speed faster.In addition, the polarization direction that the liquid crystal molecule of plane inner switching type liquid crystal displaying apparatus of the present invention by aligned twisted changes by the light of liquid crystal layer shows purpose to realize image, therefore can allow thickness of liquid crystal layer to have bigger error range, requirement to processing procedure is not so good as the prior art height, so can improve the production yield.In addition, plane inner switching type liquid crystal displaying apparatus of the present invention also has the advantage of wide viewing angle.
[description of drawings]
Fig. 1 is the schematic perspective view of prior art plane inner switching type liquid crystal displaying apparatus when not applying voltage.
Fig. 2 is the schematic perspective view of prior art plane inner switching type liquid crystal displaying apparatus when applying voltage.
Fig. 3 is the schematic perspective view of plane inner switching type liquid crystal displaying apparatus first embodiment of the present invention when not applying voltage.
Fig. 4 is the floor map of a sub-pixel of plane inner switching type liquid crystal displaying apparatus shown in Figure 3.
Fig. 5 is that plane inner switching type liquid crystal display shape shown in Figure 4 is put along the sectional view of V-V line.
Fig. 6 is the schematic perspective view of plane inner switching type liquid crystal displaying apparatus first embodiment of the present invention when applying voltage.
Fig. 7 is the floor map of a sub-pixel of plane inner switching type liquid crystal displaying apparatus second embodiment of the present invention.
Fig. 8 is the floor map of a sub-pixel of plane inner switching type liquid crystal displaying apparatus the 3rd embodiment of the present invention.
Fig. 9 is the electrode layout viewing of plane inner switching type liquid crystal displaying apparatus the 3rd embodiment of the present invention.
Figure 10 is the floor map of a sub-pixel of plane inner switching type liquid crystal displaying apparatus the 4th embodiment of the present invention.
Figure 11 is the electrode of a sub-pixel of plane inner switching type liquid crystal displaying apparatus the 4th embodiment of the present invention synoptic diagram of arranging.
Figure 12 is the diagrammatic cross-section of plane inner switching type liquid crystal displaying apparatus the 5th embodiment of the present invention.
[embodiment]
Seeing also Fig. 3, is the schematic perspective view of plane inner switching type liquid crystal displaying apparatus of the present invention when not applying voltage.Plane inner switching type liquid crystal displaying apparatus 200 of the present invention comprises a colored filter substrate 21, a thin film transistor base plate 22 and is clipped in liquid crystal layer 25 between this colored filter substrate 21 and the thin film transistor base plate 22.Polaroid 23 and polaroid 24 once are separately positioned on the outside of this colored filter substrate 21 and thin film transistor base plate 22 on one.This liquid crystal layer 25 comprises the eurymeric liquid crystal molecule 251 that is doped with palm property adulterant (Chiral Dopant).
Seeing also Fig. 4 and Fig. 5, is the floor map and the sectional view of plane inner switching type liquid crystal displaying apparatus first embodiment one pixel region of the present invention.This thin film transistor base plate 22 comprises an infrabasal plate 221, a plurality of common electrodes 26 are formed on infrabasal plate 221, one insulation course 222 covers this common electrode 26, a plurality of pixel electrodes 27 are formed on this insulation course 222 with data line 28, one passivation layer 223 covers on these a plurality of pixel electrodes 27 and the data line 28, and once alignment film 224 is formed on this passivation layer 223 and with liquid crystal layer 25 and contacts.These insulation course 222 materials are silicon dioxide (SiO
2) or silicon nitride (SiNx), these passivation layer 223 materials are silicon dioxide (SiO
2) or silicon nitride (SiNx).
This colored filter substrate 21 comprises that a upper substrate 211, one colored filters 212 and are arranged on the last alignment film 213 of these upper substrate 211 inboards.
It is very little with the pre-dumping angle of following alignment film 224 to go up alignment film 213, generally is 0 °～10 °, and liquid crystal molecule 251 major axis of liquid crystal layer 25 are roughly parallel to base plan.Wherein, last alignment film 213 roughly becomes 90 ° with the frictional direction of following alignment film 224, and upper substrate 211 becomes 90 ° of aligned twisted with liquid crystal molecule 251 between the infrabasal plate 221 when not applying voltage, with the liquid crystal layer 25 that forms a twisted nematic.The material that should go up alignment film 213 and following alignment film 224 is polyvinyl alcohol (PVA) (Polyvinyl Alcohol), and wherein the grasp of 224 pairs of liquid crystal molecules 251 of this time alignment film energy (Anchoring Strength) is much smaller than the grasp energy of 213 pairs of liquid crystal molecules 251 of last alignment film.
The polarization axle that should go up polaroid 23 is parallel with the frictional direction of last alignment film 213, so, parallel near liquid crystal molecule 251 long axis directions that should go up alignment film 213 with the polarization axle of last polaroid 23.The polarization axle of this time polaroid 24 is parallel with the polarization axle of last polaroid 23.
One gate line 29 is formed on the infrabasal plate 221 and horizontal expansion, and this banded data line 28 is formed on infrabasal plate 221 and longitudinal extension.Orthogonal gate line 29 forms a pixel region with data line 28, and each pixel region comprises that at least one is positioned at the thin film transistor (TFT) 20 of gate line 29 and data line 28 infalls, and this thin film transistor (TFT) 20 comprises a grid 201, one source pole 203 and a drain electrode 202.Wherein this grid 201 links to each other with gate line 29, and source electrode 203 links to each other with data line 28, and drain electrode 202 links to each other with pixel electrode 27.This common electrode 26 all is vertical bar shaped band electrode and parallel interval setting with pixel electrode 27, and both make by transparent conductive material, as tin indium oxide (Indium Tin Oxide, ITO) or indium zinc oxide (Indium Zinc Oxide, IZO).This common electrode 26 also can be made by conductive metallic material with pixel electrode 27.
When 26 of pixel electrode 27 and common electrodes do not apply voltage, 251 one-tenth 90 ° of aligned twisted of the liquid crystal molecule of liquid crystal layer 25, the light that sends from backlight (figure do not show) is transformed into the polarization direction linearly polarized light parallel with the polarization axle of following polaroid 24 during by polaroid 24 down, this linearly polarized light is through behind the liquid crystal layer 25, its polarization direction is reversed 90 °, be transformed into the linearly polarized light vertical with the polarization axle of last polaroid 23, so this linearly polarized light is absorbed by last polaroid 23, this moment, this plane inner switching type liquid crystal displaying apparatus 200 showed dark attitude.
Seeing also Fig. 6, is the schematic perspective view of plane inner switching type liquid crystal displaying apparatus first embodiment of the present invention when applying voltage.When between pixel electrode 27 and common electrode 26, applying certain voltage, the electric field E2 that generation one is parallel to base plan, under the effect of this electric field E2, the major axis of liquid crystal molecule 251 is towards the direction deflection that is parallel to this electric field E2, because the tilt angle of alignment film 213,224 is very little up and down, and the grasp of 224 pairs of liquid crystal molecules 251 of following alignment film can be much smaller than the grasp energy of 213 pairs of liquid crystal molecules 251 of last alignment film, so under the effect of electric field E2, liquid crystal molecule 251 roughly becomes level and evenly distributed.Light is by behind this liquid crystal layer 25, and its polarization direction can not change, and light can pass polaroid 23, and this moment, this plane inner switching type liquid crystal displaying apparatus 200 showed bright attitude.
Because each liquid crystal molecule 251 is not arranged inconsistent when applying voltage, under the effect of electric field E2, the major axis of liquid crystal molecule 251 is short from original state required time when being parallel to electric field E2 direction, so plane inner switching type liquid crystal displaying apparatus of the present invention 200 has the fast advantage of response speed.In addition, plane inner switching type liquid crystal displaying apparatus 200 of the present invention is to utilize the liquid crystal molecule 251 of aligned twisted to change the purpose of polarization direction to realize that image shows by the light of liquid crystal layer 25, therefore can allow liquid crystal layer 25 thickness to have bigger error range, requirement to processing procedure is not so good as the prior art height, so can improve the production yield.In addition, plane inner switching type liquid crystal displaying apparatus of the present invention also 200 has the advantage of wide viewing angle.
Seeing also Fig. 7, is the floor map of plane inner switching type liquid crystal displaying apparatus second embodiment one subpixel area of the present invention.This plane inner switching type liquid crystal displaying apparatus 300 is with the difference of plane inner switching type liquid crystal displaying apparatus 200, common electrode 36 has a sweep (not indicating) respectively with pixel electrode 37, this bend is divided into "〉" shape, this common electrode 36 and pixel electrode 37 spaces also be arranged in parallel.Produce two when between common electrode 36 and pixel electrode 37, applying a voltage and be parallel to substrate electric field E21, the E22 of (figure does not show), this electric field E21 is different with the direction of electric field E22, because liquid crystal molecule 351 is eurymeric liquid crystal, liquid crystal molecule 351 rotates under this two electric field E21, E22 effect and is parallel to this electric field E21, E22 respectively.So common electrode 36 that should bending is divided into two different zones with pixel electrode 37 and liquid crystal molecule 351 with a sub-pixel, these two different zones have different viewing angle characteristics, so this plane inner switching type electric field liquid crystal indicator 300 can be eliminated the colour cast problem that only exists towards a direction deflection owing to liquid crystal molecule 251 in the first embodiment of the invention plane inner switching type liquid crystal displaying apparatus 200, thereby improve display quality.
Seeing also Fig. 8, is the floor map of plane inner switching type liquid crystal displaying apparatus the 3rd embodiment one sub-pixel of the present invention.This plane inner switching type liquid crystal displaying apparatus 400 is that with the difference of plane inner switching type liquid crystal displaying apparatus 300 this common electrode 46 comprises first sweep 461, second sweep 462 and the 3rd sweep 463.Please consult Fig. 9 simultaneously, first sweep 461, second sweep 462 and the 3rd sweep 463 of this common electrode 46 comprise first side 4611,4621,4631 and second side 4612,4622,4632 respectively. First side 4611,4621,4631 joins end to end with second side 4612,4622,4632 respectively and forms three bending angle (not indicating).The first side 4611,4621,4631 of each sweep 461,462,463 and second side 4612,4622,4632 identical length etc.This first side 4611,4621,4631 inclines towards each other to be provided with and is not parallel to each other, and second side 4612,4622,4632 also is to incline towards each other to be provided with to be not parallel to each other.When between common electrode 46 and pixel electrode 47, applying certain voltage, produce electric field E31, the E32, E33, E34, E35, the E36 that are parallel to substrate (scheming not show) between common electrode 46 and the pixel electrode 47.The direction difference of this each electric field, the liquid crystal molecule 451 of each subpixel area is arranged along six different directions, every subpixel area is divided into six zones, each zone has different viewing angle characteristics, thereby can improve the visual angle and make the contrast at each visual angle identical, thereby improve display quality.
Seeing also Figure 10, is the floor map of plane inner switching type liquid crystal displaying apparatus the 4th embodiment one sub-pixel of the present invention.This plane inner switching type liquid crystal displaying apparatus 500 is that with the difference of plane inner switching type liquid crystal displaying apparatus 200 this common electrode 56 is similar wavy shaped configuration to pixel electrode 57.Please consult Figure 11 simultaneously, corrugated common electrode 56 is parallel to each other and is staggered with pixel electrode 57, and when applying certain voltage between pixel electrode 57 and common electrode 56, formation is parallel to substrate (figure does not show) and continually varying electric field.Liquid crystal molecule 551 is in continuous effect of electric field deflect, its yawing moment also is continuous variation, thereby the formation continuous domain, the colour cast defective that is produced in the time of can eliminating liquid crystal molecule only towards single direction deflection can further be improved the visual angle and strengthen the performance of color aspect.
The common electrode 56 of present embodiment plane inner switching type liquid crystal displaying apparatus 500 is not limited only to waveform with the shape of pixel electrode 57, other electrode shape that can form the continuous electric field parallel with substrate also can be used, and is also applicable as the electrode that the straight line of arc, smooth connection and curve constitute.
Seeing also Figure 12, is the diagrammatic cross-section of fifth embodiment of the invention plane inner switching type liquid crystal displaying apparatus 600.The difference of itself and the first embodiment plane inner switching type liquid crystal displaying apparatus 200 is that last polaroid 63 is orthogonal with the polarization axle of following polaroid 64.When not applying voltage, this plane inner switching type liquid crystal displaying apparatus 600 shows bright attitude.
Among the present invention, pixel electrode and common electrode also can be arranged on same one deck of same substrate, also can be arranged on the different substrate.Polaroid of the present invention also can be arranged on the inboard of substrate.
Claims (14)
1. plane inner switching type liquid crystal displaying apparatus, comprise that the liquid crystal layer, two that two upper substrates that are provided with relatively and infrabasal plate, are sandwiched between upper substrate and the infrabasal plate is separately positioned on the last polaroid of upper substrate and infrabasal plate and the last alignment film and following alignment film that following polaroid, a plurality of pixel electrode and common electrode and two are separately positioned on upper substrate and infrabasal plate inboard, it is characterized in that: alignment film roughly becomes 90 degree with the frictional direction of following alignment film on this, forms the liquid crystal layer of a twisted nematic.
2. plane inner switching type liquid crystal displaying apparatus as claimed in claim 1 is characterized in that: the grasp of this time alignment film can be greater than the grasp energy of last alignment film.
3. plane inner switching type liquid crystal displaying apparatus as claimed in claim 2 is characterized in that: the polarization axle of this time polaroid is parallel to the major axis near the liquid crystal molecule of this time alignment film surface.
4. plane inner switching type liquid crystal displaying apparatus as claimed in claim 3 is characterized in that: this pixel electrode and common electrode are long strip types.
5. as claim 1 or 3 described plane inner switching type liquid crystal displaying apparatus, it is characterized in that: when applying voltage, produce the electric field that has both direction at least between pixel electrode and the common electrode.
6. plane inner switching type liquid crystal displaying apparatus as claimed in claim 5 is characterized in that: this pixel electrode and common electrode are bending shapes.
7. plane inner switching type liquid crystal displaying apparatus as claimed in claim 5 is characterized in that: this pixel electrode and this common electrode are shaped forms.
8. plane inner switching type liquid crystal displaying apparatus as claimed in claim 7 is characterized in that: this pixel electrode and this common electrode are undaforms.
9. plane inner switching type liquid crystal displaying apparatus as claimed in claim 7 is characterized in that: this pixel electrode and this common electrode are arcs.
10. plane inner switching type liquid crystal displaying apparatus as claimed in claim 7 is characterized in that: this pixel electrode and this common electrode are to be formed by connecting by straight line and curve smoothing.
11. plane inner switching type liquid crystal displaying apparatus as claimed in claim 1 is characterized in that: this pixel electrode and common electrode are formed on the infrabasal plate.
12. plane inner switching type liquid crystal displaying apparatus as claimed in claim 1 is characterized in that: this pixel electrode is formed on the different substrates with common electrode.
13. plane inner switching type liquid crystal displaying apparatus as claimed in claim 1 is characterized in that: polaroid and following polaroid are formed at close liquid crystal layer one side of corresponding substrate respectively on this.
14. plane inner switching type liquid crystal displaying apparatus as claimed in claim 1 is characterized in that: this liquid crystal layer comprises the eurymeric liquid crystal material that is doped with palm property adulterant.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051494 CN1746754A (en) | 2004-09-11 | 2004-09-11 | Plane inner switching type liquid crystal displaying apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051494 CN1746754A (en) | 2004-09-11 | 2004-09-11 | Plane inner switching type liquid crystal displaying apparatus |
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| CN1746754A true CN1746754A (en) | 2006-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018978A (en) * | 2012-12-14 | 2013-04-03 | 京东方科技集团股份有限公司 | Liquid crystal display panel and display device |
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2004
- 2004-09-11 CN CN 200410051494 patent/CN1746754A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018978A (en) * | 2012-12-14 | 2013-04-03 | 京东方科技集团股份有限公司 | Liquid crystal display panel and display device |
| CN103018978B (en) * | 2012-12-14 | 2016-08-17 | 京东方科技集团股份有限公司 | A kind of liquid crystal panel and display device |
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Owner name: QUNKANG SCIENCE & TECHNOLOGY (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: HONGFUJIN PRECISION INDUSTRY (SHENZHEN) CO., LTD.; APPLICANT Effective date: 20070914 |
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Effective date of registration: 20070914 Address after: 4, 1 floor, E District, Foxconn science and Technology Industrial Park, Longhua Town, Shenzhen, Guangdong, Baoan District 518109, China Applicant after: Qunkang Technology (Shenzhen) Co., Ltd. Co-applicant after: Innolux Display Group Address before: 518109, No. two, No. tenth, East Ring Road, Pinus tabulaeformis Industrial Zone, Longhua Town, Baoan District, Guangdong, Shenzhen, 2 Applicant before: Hongfujin Precise Industry (Shenzhen) Co., Ltd. Co-applicant before: Innolux Display Group |
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