CN2757174Y - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN2757174Y CN2757174Y CN 200420046319 CN200420046319U CN2757174Y CN 2757174 Y CN2757174 Y CN 2757174Y CN 200420046319 CN200420046319 CN 200420046319 CN 200420046319 U CN200420046319 U CN 200420046319U CN 2757174 Y CN2757174 Y CN 2757174Y
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- liquid crystal
- crystal indicator
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- public electrode
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Abstract
The utility model relates to a liquid crystal display device which comprises an upper basal plate and a lower basal plate which are arranged oppositely, a liquid crystal layer which is positioned between the two basal plates, pixel electrodes which are arranged on same basal plate, a common electrode, a plurality of data lines, an insulating layer which is positioned between the pixel electrodes and the common electrode and at least one alignment layer which is positioned on the upper basal plate and the lower basal plate, wherein the common electrode is in a plane plate shape. The alignment layer is provided with two alignment directions, a first alignment direction and a second alignment direction, and each of the pixel electrodes comprises a first part and a second part which respectively extends towards two directions.
Description
[technical field]
The utility model is about a kind of liquid crystal indicator, particularly about a kind of fringe field switch type lcd device.
[background technology]
So numerous advantages such as liquid crystal indicator has low diathermaneity, volume is compact and power consumption is low are day by day extensive in the use.But when the user observed liquid crystal indicator from different perspectives, the contrast of image can reduce along with the increase of viewing angle, thereby produced angle limitations.For gray scale and colored the demonstration, the phenomenon of aberration and gray-scale inversion also can take place when the visual angle is big.Under the situation that large scale develops and the many people of confession watch simultaneously, this weakness is particularly outstanding at liquid crystal indicator, becomes the big obstacle to the cathode ray tube technologies challenge.Therefore, the wide viewing angle technology is liquid crystal technology personnel's a important subject.
Divide from the mode of utilizing to incident light, liquid crystal indicator can be divided into penetration, semi-penetration, semi-reflective and reflective three kinds.
The early stage liquid crystal indicator that occurs mainly adopts twisted nematic and super-twist nematic pattern, yet, no matter all there are the narrow defective in visual angle in penetration, semi-penetration, semi-reflective or reflective liquid crystal indicator.For overcoming this defective, HIT (Hitachi) takes the lead in proposing a kind of passive matrix electrophoretic displays (In-Plane Switching mode, wide viewing angle technology IPS).Rotary-type liquid crystal indicator and traditional twisted nematic, the difference of super-twist nematic liquid crystal indicator are in this kind plane: its public electrode and pixel electrode are arranged on the same substrate, utilize the transverse horizontal electric field that produces between public electrode and pixel electrode that liquid crystal molecule is rotated in the plane.Rotary-type liquid crystal indicator can significantly improve the visual angle of liquid crystal indicator in this kind plane, yet because of its public electrode and pixel electrode are arranged on the same substrate, its aperture opening ratio is lower, and contrast and response time are compared with traditional twisted nematic or super-twist nematic liquid crystal indicator and do not have much improvement.
Fringe field switch (Fringe Field Switching, FFS) technology is a kind of main flow wide viewing angle technology that has much advantage, it is proposed by Hyundai company, from principle, can be regarded as further developing on the handoff technique basis planar, fringe field switch type lcd device improves the electrode setting mode of plane inner switching type liquid crystal displaying apparatus, it makes common transparent electrode tabular to increase transmissivity, and an alternating floor insulation course and pixel electrode insulation, thereby can improve plane inner switching type liquid crystal displaying apparatus aperture opening ratio defect of insufficient.And the spacing of its public electrode and pixel electrode is narrower than passive matrix electrophoretic displays, and this design makes Electric Field Distribution more intensive.
With the penetration fringe field switch type lcd device is example, please consults Fig. 1 to Fig. 3 together, is prior art fringe field switch type lcd device synoptic diagram.
Seeing also Fig. 1, is the fringe field switch type lcd device diagrammatic cross-section of prior art.This liquid crystal indicator 1 comprises that two relative transparent lower substrate 100 and upper substrate 130, a plurality of liquid crystal molecules 120 are distributed between this infrabasal plate 100 and the upper substrate 130.One transparent common electrode 101, a transparent insulating layer 102, transparent pixels electrode 109 and once alignment film 112 be successively set on the inside surface of this infrabasal plate 100, this pixel electrode 109 is positioned at one and has certain thickness passivation layer 111.Alignment film 131 is arranged on upper substrate 130 inside surfaces on one.
Power up and be pressed on pixel electrode 109 and public electrode 101, produce electric field E1 and E2 betwixt.At this moment, electric field E1 is along passivation layer 111, both alignment layers 112, liquid crystal layer 120, both alignment layers 112, passivation layer 111 and insulation course 102 extensions down down, and electric field E2 is a vertical electric field.
Seeing also Fig. 2, is a pixel region structural representation of prior art fringe field switch type lcd device 1.This pixel region comprises data line 150, gate line 160, thin film transistor (TFT) 140, pixel electrode 109 and public electrode 101.This pixel electrode 109 is a broken line shape, this thin film transistor (TFT) 140 is arranged on data line 150 and gate line 160 infalls, grid 143, the source electrode 142 of thin film transistor (TFT) 140 are connected with gate line 160, data line 150 respectively, and drain electrode 141 is connected with pixel electrode 109 by pixel electrode connecting line (figure does not show).Public electrode 101 is tabular placing in the pixel region as a whole.Above-mentioned public electrode 101 is by transparent conductive body, and (Indium Tin Oxide ITO) makes as indium tin oxide.
Please consult Fig. 3 and Fig. 4 together, Fig. 3 is the enlarged diagram in III district among Fig. 2.This pixel electrode 109 is a broken line shape, itself and public electrode 101 produce an electric field, and liquid crystal molecule 120 makes this pixel be divided into two zones on display effect along both direction deflection under this electric field action, the aberration that two zones cause can compensate mutually, claims this electric field to be two territories electric fields.
Fig. 4 is the liquid crystal molecule rotation synoptic diagram in the fringe field switch type lcd device of two territories.Wherein solid line is represented the making alive state, and dotted line is represented not making alive state, and liquid crystal molecule all rotates in the XY plane.Because fringe field switching mode electrode structure characteristic, liquid crystal molecule has dancing in electric field, thereby has the more inconsistent anglec of rotation to distribute on the same direction, and the planarization that light is penetrated is better, also makes the situation of gamut lower.Can find out by solid line, two territories fringe field switching mode has a plurality of sense of rotation, therefore, under "on" position, promptly when display is in bright attitude, two territories fringe field switching mode has higher aperture opening ratio, and when observing LCD from different perspectives, the situation that color changes with angle can be not clearly.
But when display was in dark attitude, by dotted line among the figure also as can be seen, liquid crystal molecule had only an orientation when no power, that is to say pixel zone just on display effect, therefore can't color difference eliminating and the light leak of wide-angle.
Seeing also Fig. 5, is the contrast and the visual angle graph of a relation of prior art liquid crystal indicator 1.The contrast of the plain electrode structure fringe field switch type lcd device of the broken line image of prior art on the different directions visual angle differs bigger, the sum total effect in its pair territory is at contrast height up and down and on the left and right directions, upwards contrast is lower on tiltedly and tiltedly, so its viewing angle characteristic is not good.
[utility model content]
For overcoming the defective of prior art liquid crystal indicator aberration and wide-angle light leak, the utility model provides a kind of liquid crystal indicator with preferable viewing angle characteristic.
The technical scheme that the utility model technical solution problem is adopted is: a kind of liquid crystal indicator is provided, it comprises the upper substrate and the infrabasal plate of pair of opposing, one is positioned at the liquid crystal layer between this two substrate, be positioned at the pixel electrode on the same substrate, public electrode and a plurality of data line, this public electrode is a plane tabular, one is positioned at insulation course and at least one both alignment layers that is positioned on upper substrate and the infrabasal plate between pixel electrode and public electrode, this both alignment layers has first orientation and two alignment direction of second orientation, and this each pixel electrode comprises first and the second portion that extends to both direction respectively.
Compared with prior art, the advantage of the utility model fringe field switch type lcd device is: because both alignment layers has two alignment direction, liquid crystal molecule is arranged along two alignment direction, therefore when dark attitude, produce the multiple domain field, the synthetic result of multiple domain can eliminate the aberration of prior art and the light leak of wide-angle, and the viewing angle characteristic of all directions is more excellent.
[description of drawings]
Fig. 1 is the diagrammatic cross-section of prior art fringe field switch type lcd device.
Fig. 2 is the structural representation of fringe field switch type lcd device one pixel region shown in Figure 1.
Fig. 3 is the enlarged diagram in III district among Fig. 2.
Fig. 4 is the liquid crystal molecule rotation synoptic diagram in the fringe field switch type lcd device of two territories.
Fig. 5 is the contrast and the visual angle graph of a relation of prior art fringe field switch type lcd device.
Fig. 6 is the first embodiment sectional view of the utility model fringe field switch type lcd device.
Fig. 7 is the floor map of the utility model fringe field switch type lcd device first embodiment one subpixel area.
Fig. 8 is that electrode is arranged and the initial orientation synoptic diagram of liquid crystal molecule in the utility model fringe field switch type lcd device first embodiment one subpixel area.
Fig. 9 is fringe field switch type lcd device shown in Figure 6 liquid crystal deflecting element synoptic diagram when making alive.
Figure 10 is the contrast and the visual angle graph of a relation of the utility model fringe field switch type lcd device first embodiment.
Figure 11 is the utility model fringe field switch type lcd device second embodiment synoptic diagram.
Figure 12 is the utility model fringe field switch type lcd device the 3rd embodiment synoptic diagram.
Figure 13 is the utility model fringe field switch type lcd device the 4th embodiment synoptic diagram.
Figure 14 is the utility model fringe field switch type lcd device the 5th embodiment synoptic diagram.
Figure 15 is the utility model fringe field switch type lcd device the 6th embodiment synoptic diagram.
[embodiment]
Please consult Fig. 6 and Fig. 7 together.Fig. 6 is the utility model fringe field switch type lcd device first embodiment sectional view.This fringe field switch type lcd device 2 comprises a upper substrate 270, one infrabasal plate 280, one liquid crystal layer 260, both alignment layers 273 on one, once both alignment layers 253, one insulation course 251, pixel electrode 240 and public electrode 250, this upper substrate 270 is oppositely arranged with infrabasal plate 280, this liquid crystal layer 260 is between this upper substrate 270 and infrabasal plate 280, this both alignment layers 273,253 lay respectively on upper substrate 270 and the infrabasal plate 280, public electrode 250 is a plane tabular, place pixel electrode 240 belows as a whole, this insulation course 251 is between pixel electrode 240 and public electrode 250.In addition, this fringe field switch type lcd device 2 also comprises the polaroid 275,285 of pair of opposing, and it lays respectively at the outside of corresponding substrate 270,280.
Fig. 7 is the floor map of Fig. 6 one subpixel area.This pixel region comprises data line 210, gate line 230, thin film transistor (TFT) 220, pixel electrode 240 and public electrode 250.This pixel electrode 240 is a shaped form, this thin film transistor (TFT) 220 is arranged on the infall of data line 210 and gate line 230, gate line 230 is connected with the grid 221 of thin film transistor (TFT) 220 to transmit sweep signal, this sweep signal is in order to the switch of control TFT 220, data line 210 is connected with data signal with the source electrode 222 of thin film transistor (TFT) 220, be that source electrode 222 is in order to the reception data-signal, the drain electrode 223 of thin film transistor (TFT) 220 electrically connects by pixel electrode connecting line (figure does not show) and pixel electrode 240.This public electrode 250 is connected with concentric line (figure does not show), is plane tabular as a whole and places in the pixel region.Above-mentioned public electrode 250 is made as indium tin oxide by transparent conductive material.
Please consult Fig. 8 and Fig. 9 together, Fig. 8 is that electrode is arranged and the initial orientation synoptic diagram of liquid crystal molecule in the utility model fringe field switch type lcd device first embodiment one subpixel area.Do not have voltage to be added between pixel electrode 240 and the public electrode 250 this moment, liquid crystal molecule 261 in the liquid crystal layer 260 is arranged along both alignment layers 253,273 directions, each subpixel area is divided into two mutually perpendicular zones, part liquid crystal molecule 261 along continuous straight runs (being directions X) are arranged, and another part liquid crystal molecule 261 is arranged along vertical direction (being the Y direction).Display shown in Figure 8 is in dark attitude at this moment, this dark attitude shows it is neither with regional liquid crystal molecule 261 coefficient results, promptly form the multiple domain field, thereby when observing LCD, wide-angle can reduce the aberration phenomenon, simultaneously can reduce light leakage phenomena, so the utility model fringe field switch type lcd device 2 has higher display quality.
Fig. 9 is fringe field switch type lcd device shown in Figure 6 liquid crystal deflecting element synoptic diagram when making alive.Liquid crystal molecule 261 is the eurymeric liquid crystal, apply voltage between pixel electrode 240 and the public electrode 250, this moment, the long axis direction of liquid crystal molecule 261 was arranged along direction of an electric field, and liquid crystal indicator is in bright attitude, when voltage reaches certain value, liquid crystal indicator just is in complete bright state.Because pixel electrode 240 is arcs, public electrode 250 is positioned at pixel electrode 240 belows for plane tabular, liquid crystal molecule 261 rotates along different directions, therefore it forms the multiple domain field, the transmitance of this pixel region is the summation of all liquid crystal molecule 261 deflecting actions, and a plurality of territories are synthetic jointly, and the contrast of this fringe field switch type lcd device 2 is improved, aberration and gray-scale inversion reduce greatly, thereby realize higher image display quality.
Seeing also Figure 10, is the contrast and the visual angle graph of a relation of the utility model fringe field switch type lcd device first embodiment.Figure 10 and above-mentioned Fig. 5 are capture figure but not drafting figure.When voltage puts on pixel electrode 240 and the public electrode 250, the deflection of the liquid crystal molecule 261 in the liquid crystal layer 260 changes continuously, a plurality of liquid crystal molecules in one pixel region have a plurality of yawing moments with respect to the shape of electrode, so its contrast is comparatively average on each visual angle.See also Fig. 5, reach the left and right directions height up and down compared to existing technology, four jiaos of star features that other direction is lower, the contrast of present embodiment is significantly improved on except that other direction that reaches left and right directions up and down, and it still shows better reaching left and right directions up and down, almost has the optical characteristics of circle symmetry.Because of the observer may be at the unspecified angle of display device rather than only observe reaching on the left and right directions up and down, so this contrast viewing angle characteristic more meets the observation requirement.
Seeing also Figure 11, is the utility model fringe field switch type lcd device second embodiment synoptic diagram.This fringe field switch type lcd device 3 adopts bending type pixel electrode 340, the orientation of liquid crystal molecule 361 is divided into two parts, wherein a part of liquid crystal molecule 361 along continuous straight runs are arranged, another part liquid crystal molecule 361 is arranged along the direction perpendicular to this first's liquid crystal molecule 361, this structural liquid crystal display no matter is in dark attitude or bright attitude all can form the multiple domain field, its principle is identical with first embodiment, difference is that pixel electrode 340 shapes still can reach the effect of wide viewing angle and high display quality equally with aforementioned different in the present embodiment.
For reducing the electric field inactive area, also can change the shape of public electrode edge and data line.Seeing also Figure 12, is the 3rd embodiment synoptic diagram of the utility model fringe field switch type lcd device.The edge of the public electrode 450 that this fringe field switch type lcd device 4 is compared with first embodiment and the shape of data line 410 adopt and the consistent structure of pixel electrode 440 shapes, this kind structure can make the electric field that produces between pixel electrode 440 and the public electrode 450 more concentrated, and data line 410 is consistent with pixel electrode 440 shapes, make that adjacent pixel regions and one's respective area are tightr on every side, dwindle the spacing of each pixel region, thereby reduce the electric field inactive area.
The shape of the pixel electrode of the utility model fringe field switch type lcd device is not limited to bend shape or arc, other electrode shape that can form the continuous domain electric field parallel with substrate also can adopt, and also is suitable for as the straight line of smooth connection and the curve shape of curve formation.
See also Figure 13 to Figure 15, the utility model fringe field switch type lcd device polaroid structure is not limited only to aforesaid polaroid shown in Figure 6 275,285 and is positioned at corresponding substrate 270,280 outsides, also can adopt a slice polaroid at least to place the built-in polaroid structure of corresponding substrate inboard, shown in polaroid 575,585,675,685,775,785.
The utility model both alignment layers can adopt friction matching method (Rubbing), light orientation method (Photo-Alignment), ion beam orientation method (Ion Beam Alignment) or lithography orientation method (lithographic printing) to realize.
The concentric line of the utility model fringe field switch type lcd device, public electrode and pixel electrode can adopt transparent conductive material such as indium tin oxide etc.When adopting transparent material, can obtain high aperture opening ratio, thereby have higher brightness.
The electrode structure of the utility model fringe field switch type lcd device also can be positioned at upper substrate.
The utility model fringe field switch type lcd device can adopt different lighting systems such as penetration, reflective, semi-penetration, semi-reflective.
When adopting penetration, the pixel electrode of fringe field switch type lcd device and public electrode are to be made by transparent conductive material.
In reflective fringe field switch type lcd device, two kinds of embodiments are arranged, one is that at least one electrode is to be made by the metal material with reflecting properties in public electrode and the pixel electrode, it two is made by transparent conductive material for public electrode and pixel electrode, and a reflecting plate reflects incident ray under being arranged on this public electrode and pixel electrode.
When adopting semi-penetration, semi-reflective, an embodiment of fringe field switch type lcd device is that pixel electrode is made by the metal material with reflecting properties, and public electrode is made by transparent conductive material.Perhaps also can adopt another embodiment: public electrode comprises that a photo-emission part divides and a light transmission part, and this photo-emission part divides to be made by the metal material with reflecting properties, and this light transmission part is made by transparent conductive material.
Claims (20)
1. liquid crystal indicator, it comprises that the upper substrate of pair of opposing and infrabasal plate, are positioned at liquid crystal layer between this two substrate, are positioned at pixel electrode, public electrode and a plurality of data line on the same substrate, this public electrode is a plane tabular, one is positioned at insulation course and at least one both alignment layers that is positioned on upper substrate and the infrabasal plate between pixel electrode and public electrode, it is characterized in that: this both alignment layers has first orientation and two alignment direction of second orientation, and this each pixel electrode comprises first and the second portion that extends to both direction respectively.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: this first and second portion are to the different directions bending.
3. liquid crystal indicator as claimed in claim 1 is characterized in that: this first and second portion bend to different directions.
4. liquid crystal indicator as claimed in claim 1 is characterized in that: this data line shape is identical with pixel electrode shape.
5. liquid crystal indicator as claimed in claim 1 is characterized in that: this data line is a straight line.
6. liquid crystal indicator as claimed in claim 1 is characterized in that: the edge of this public electrode is identical with pixel electrode shape.
7. liquid crystal indicator, it comprises upper substrate, infrabasal plate, liquid crystal layer, a plurality of data lines, pixel electrode, public electrode, insulation course and at least one both alignment layers, this upper substrate and infrabasal plate are oppositely arranged, this liquid crystal layer is positioned between this two substrate, this pixel electrode, public electrode and data line bit are in same substrate, this public electrode is a plane tabular, this insulation course is positioned between pixel electrode and public electrode, this both alignment layers is positioned at upper substrate and infrabasal plate, it is characterized in that: this both alignment layers has first orientation and two alignment direction of second orientation, and this data line shape is identical with pixel electrode shape.
8. liquid crystal indicator as claimed in claim 7 is characterized in that: first orientation and second orientation of this both alignment layers are orthogonal.
9. liquid crystal indicator as claimed in claim 7 is characterized in that: this pixel electrode comprises first and two parts of second portion of extending to different directions at least.
10. liquid crystal indicator as claimed in claim 9 is characterized in that: the each several part bearing of trend of this pixel electrode is identical.
11. liquid crystal indicator as claimed in claim 9 is characterized in that: this pixel electrode each several part is to the different directions bending.
12. liquid crystal indicator as claimed in claim 9 is characterized in that: this pixel electrode each several part bends to different directions.
13. liquid crystal indicator as claimed in claim 9 is characterized in that: this data line is identical with the pixel electrode bearing of trend.
14. liquid crystal indicator as claimed in claim 9 is characterized in that: this data line is a straight line.
15. as claim 10 or 11 described liquid crystal indicators, it is characterized in that: the edge shape of this public electrode is identical with pixel electrode shape.
16. liquid crystal indicator as claimed in claim 7 is characterized in that: the surface of this upper and lower substrate is respectively equipped with a polaroid.
17. liquid crystal indicator as claimed in claim 16 is characterized in that: this two polaroid all is arranged on the outer surface of corresponding substrate.
18. liquid crystal indicator as claimed in claim 16 is characterized in that: at least one polaroid is arranged on the inner surface of corresponding substrate.
19. liquid crystal indicator as claimed in claim 7 is characterized in that: this liquid crystal indicator is a penetration fringe field switch type lcd device.
20. liquid crystal indicator as claimed in claim 7 is characterized in that: this liquid crystal indicator is a semi-penetration, semi-reflective fringe field switch type lcd device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420046319 CN2757174Y (en) | 2004-05-22 | 2004-05-22 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420046319 CN2757174Y (en) | 2004-05-22 | 2004-05-22 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2757174Y true CN2757174Y (en) | 2006-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420046319 Expired - Lifetime CN2757174Y (en) | 2004-05-22 | 2004-05-22 | Liquid crystal display device |
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| Country | Link |
|---|---|
| CN (1) | CN2757174Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289114A (en) * | 2011-08-22 | 2011-12-21 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display device |
-
2004
- 2004-05-22 CN CN 200420046319 patent/CN2757174Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289114A (en) * | 2011-08-22 | 2011-12-21 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display device |
| CN102289114B (en) * | 2011-08-22 | 2013-05-29 | 南京中电熊猫液晶显示科技有限公司 | Liquid crystal display device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140522 Granted publication date: 20060208 |