CN103901673B - The pixel cell of fringe field switching mode LCD and array base palte - Google Patents
The pixel cell of fringe field switching mode LCD and array base palte Download PDFInfo
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- CN103901673B CN103901673B CN201210577024.4A CN201210577024A CN103901673B CN 103901673 B CN103901673 B CN 103901673B CN 201210577024 A CN201210577024 A CN 201210577024A CN 103901673 B CN103901673 B CN 103901673B
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Abstract
The invention discloses the pixel cell of a kind of fringe field switching mode LCD and array base palte, described pixel cell and array base palte all include pixel electrode, described pixel electrode includes an electrode and connects the termination electrode of an electrode tip, described pixel cell and array base palte also include suppressing electrode, described suppression electrode is arranged on the described termination electrode side away from described electrode, and described suppression electrode extends in parallel setting near the limit of described termination electrode side with described termination electrode, simultaneously, described suppression electrode is electrically connected with described public electrode by groove or the via offered on described passivation layer.The present invention, by arranging the Electric Field Distribution suppressing electrode to change around the termination electrode of pixel electrode, reduces the Y-direction electric field component in territory, effective display area, such that it is able to reduce or eliminate to wrong (disclination line) phenomenon.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to a kind of fringe field switching mode LCD pixel cell and array base palte.
Background technology
At Thin Film Transistor-LCD (ThinFilmTransistorLiquidCrystalDisplay, it is called for short TFT-LCD) in product, fringe field switching technology (FringeFieldSwitching, it is called for short FFS) aperture opening ratio and the absorbance of plane internal switch (In-Plane-Switching, be called for short IPS) mode LCD can be improved.
The liquid crystal display of FFS mode includes public electrode and pixel electrode, described public electrode and pixel electrode are by insulating barrier separating heavy stack arrangement, and distance between the two is controllable to the distance between less than upper lower glass substrate, fringing field can be formed between public electrode and pixel electrode, thus, the liquid crystal molecule being positioned at above pixel electrode can be controlled, overcoming electric field directly over traditional IPS liquid crystal display pixel electrode is vertical direction, the uncontrolled defect of liquid crystal molecule, substantially increases aperture opening ratio and the absorbance of liquid crystal display.
Figure 1A is the end face schematic diagram of the liquid crystal display pixel unit of existing FFS mode.Figure 1B is the liquid crystal display pixel unit schematic cross-section along A-A ' of existing FFS mode.As shown in FIG. 1A and 1B, pixel cell 10 includes the pixel electrode 11 of pectination, the public electrode 12 of planar and the insulating barrier 13 being arranged between.Wherein, pixel electrode 11 includes the multiple strip shaped electric poles 111 be arrangeding in parallel and the termination electrode 112 connecting strip electrode tip.After pixel electrode 11 and public electrode 12 apply voltage difference, termination electrode 112 can form electric field component EY with public electrode 12 (i.e. the direction of the extension of described strip shaped electric poles) in the Y direction.The existence of above-mentioned electric field component can make pixel cell edge Liquid Crystal Molecules Alignment unstable, and specifically, the electric field component of Y-direction can affect the liquid crystal molecule rotation direction at X/Y plane, causes to wrong (Disclinationlines) phenomenon.
Summary of the invention
The technical problem to be solved is in that to propose a kind of fringe field switching mode LCD pixel cell and array base palte, and the pixel cell edge that the termination electrode of reduction or elimination fringe field switching mode LCD pixel electrode causes occurs to wrong problem.
The invention discloses the pixel cell of a kind of fringe field switching mode LCD, described pixel cell includes pixel electrode, public electrode and the passivation layer being arranged between pixel electrode and public electrode；
Described pixel electrode includes the electrode that at least two be arranged in parallel and the termination electrode connecting a described electrode tip；
Described pixel cell also includes suppressing electrode, described suppression electrode is arranged on the described termination electrode side away from described electrode, and described suppression electrode extends in parallel setting near the limit of described termination electrode side with described termination electrode, meanwhile, described suppression electrode is electrically connected with described public electrode by groove or the via offered on described passivation layer.
Preferably, described suppression electrode can be linear, fold-line-shaped, shaped form away from the limit of described termination electrode side.
Preferably, the width of described suppression electrode is more than 3.5 μm.
Preferably, described termination electrode width is 2 ~ 3.5 μm.
Preferably, an electrode for described pixel electrode can be strip, zigzag or fishbone.
Preferably, described pixel electrode, described public electrode and described suppression electrode are transparency electrode.
Preferably, described suppression electrode thickness above described passivation layer is more than or equal to the thickness of described termination electrode.
Preferably, the distance between described suppression electrode and described termination electrode is less than described passivation layer thickness.
The invention also discloses the array base palte of a kind of fringe field switching mode LCD, including:
The grid line of setting intersected with each other and data wire, described grid line and data wire limit pixel region；
It is arranged on described grid line and the switching device of data wire crossover location；
It is positioned at the pixel electrode of described pixel region；
Cover the public electrode of described array base palte；And
It is arranged at the passivation layer between described pixel electrode and public electrode；
Wherein, described pixel electrode includes the electrode that at least two be arranged in parallel and the termination electrode connecting a described electrode tip；
Described array base palte also includes suppressing electrode, described suppression electrode is arranged on the described termination electrode side away from described electrode, and described suppression electrode extends in parallel setting near the limit of described termination electrode side with described termination electrode, meanwhile, described suppression electrode is electrically connected with described public electrode by groove or the via offered on described passivation layer.
The present invention is by arranging the suppression electrode parallel with the termination electrode of pixel electrode, change the Electric Field Distribution in termination electrode surrounding vertical direction, the electric field component pointing to Y-axis negative direction is made to reduce or disappear, such that it is able to the arrangement of the liquid crystal molecule of stability contorting pixel cell edge visibility region, inhibit to wrong and disorderly row's phenomenon appearance, improve the display quality of FFS mode liquid crystal display.
Accompanying drawing explanation
Figure 1A is the end face schematic diagram of the liquid crystal display pixel unit of existing FFS mode；
Figure 1B is the schematic cross-section along A-A ' of the liquid crystal display pixel unit of existing FFS mode；
Fig. 2 A is the end face schematic diagram of the pixel cell of first embodiment of the invention；
Fig. 2 B is the pixel cell schematic cross-section along B-B ' of first embodiment of the invention；
Fig. 2 C is the end face schematic diagram of another embodiment of first embodiment of the invention；
Fig. 3 A is the luminosity distribution schematic diagram of the pixel cell of the present embodiment that emulation obtains；
Fig. 3 B is the luminosity distribution schematic diagram of the pixel cell of the prior art that emulation obtains；
Fig. 4 is the schematic cross-section of the pixel cell of another embodiment of first embodiment of the invention；
Fig. 5 is the end face schematic diagram of the array base palte of second embodiment of the invention.
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with accompanying drawing and by detailed description of the invention.
Fig. 2 A is the end face schematic diagram of the pixel cell of first embodiment of the invention.Fig. 2 B is the pixel cell schematic cross-section along B-B ' of first embodiment of the invention.As shown in Figure 2 A and 2 B, described pixel cell 20 includes pixel electrode 21, public electrode 22 and the passivation layer 23(that is arranged between pixel electrode 21 and public electrode 22 is shown in phantom in fig. 2).
Described pixel electrode 21 includes the electrode 211 that at least two be arranged in parallel and the termination electrode 212 connecting a described electrode tip.
Described pixel cell 20 also includes suppressing electrode 24, described suppression electrode 24 is arranged on the described termination electrode 212 side away from described electrode 211, and described suppression electrode 24 extends in parallel setting near the limit 241 of described termination electrode 212 side with described termination electrode 212, meanwhile, described suppression electrode is electrically connected with described public electrode 22 by groove 231 or the via 231 offered on described passivation layer 23.
In the present embodiment, described public electrode 22 is the plane-shape electrode covering pixel region.Meanwhile, described pixel electrode 21, public electrode 22 and suppress electrode 24 to be transparency electrode, described transparency electrode can pass through indium tin oxide (ITO), indium-zinc oxide (IZO), the combination of above-mentioned material or the manufacture of other transparent conductive materials.It should be noted that described public electrode 22 can also adopt comb teeth-shaped at pixel region, its pole and described electrode 211 interval are alternately arranged.
In a preferred implementation of the present embodiment, the width of described termination electrode 212 is formed 2-3.5 micron (μm).The width of described electrode 211 is formed 2.2 microns (μm).Described passivation layer 23 thickness is 0.2-0.3 micron (μm).
In the present invention, " width " of electrode for electrode in base plan, along the size of Y-direction.
Meanwhile, " thickness " of electrode refers to electrode size along the stacked direction of array base palte.
It should be noted that an electrode shape of pixel electrode is except being formed as the strip shown in figure, it is also possible to for zigzag, fish bone well etc..
The present embodiment pixel cell can pass through after forming described passivation layer 23, on described passivation layer 23, described termination electrode 212 is away from the multiple via of region etch of the side of described electrode 211 or the groove identical with described termination electrode 212 shape, then deposit transparency conducting layer again, and graphically form described pixel electrode 21 and described suppression electrode 24 and obtain.
Certainly, it will be understood by those skilled in the art that described suppression electrode 24 can have the shape different from described termination electrode 212, its size is not equally by the impact of termination electrode.
In a preferred implementation of the present embodiment, the width of described suppression electrode 24 is set to larger than 3.5 microns.
In another preferred implementation of the present embodiment, as shown in Figure 2 C, the shape of described suppression electrode can also be formed different from termination electrode, for instance, the limit 242 away from described termination electrode side can be other shape, for instance fold-line-shaped or shaped form.
As shown in FIG. 1A and 1B, when being not provided with suppressing electrode, termination electrode 112 forms electric field with the public electrode 12 being disposed below, and this electric field is mainly distributed on two sides of described termination electrode at the component of Y direction.Simultaneously, for each pixel cell, in the pixel region of a pixel, termination electrode is near the pixel edges of termination electrode and be not belonging to effective display area (ActiveArea, AA district), therefore, in termination electrode and Figure 1A and Fig. 2 A, pixel region more than termination electrode all can be invisible by black matrix" (BlackMatrix, BM) covering.In Figure 1B, the Y-direction electric field component of the side (namely near the direction of an electrode in figure) that termination electrode 112 points to Y-axis positive direction side can cover AA district, and then the Liquid Crystal Molecules Alignment in AA district is constituted impact, formed can be observed affect liquid crystal display quality to mistake phenomenon.And termination electrode 112 points to Y-axis negative direction (namely away from the direction of electrode in figure) although the liquid crystal molecule of corresponding region also can be constituted impact by the Y-direction electric field component of side of side, liquid crystal molecule is made to occur to wrong phenomenon, but, owing to this region is the region that black matrix" covers, it it is the sightless part of liquid crystal indicator, therefore, liquid crystal display quality is not constituted materially affect.
As shown in Figure 2 A and 2 B, the present embodiment arranges suppression electrode 24 between termination electrode 212 and pixel edges, it is suppressed that electrode 24 is electrically connected with public electrode 22 by via or groove, and therefore both have identical voltage.Thus, it is suppressed that between electrode 24 and termination electrode 212, there is electric potential difference, the electric field pointing to Y-axis negative direction it is consequently formed.The existence suppressing electrode 24 can change the CHARGE DISTRIBUTION on termination electrode 212, owing to suppressing electrode 24 to be oppositely arranged in parallel with termination electrode 212 near the limit of described termination electrode 212 side, and distance compared to public electrode 22 other position closer to, therefore, most of free charge in termination electrode 212 can move away from side 241 corresponding to suppressing electrode 24, the side of an electrode and form the electric field pointing to Y direction, thus cause that termination electrode 212 greatly reduces in the free charge quantity away from pixel edge side, and then, termination electrode 212 can significantly reduce at the electric field component of the Y direction that Y-axis positive direction (namely near electrode direction) is formed with public electrode 23.
Analyze from another angle, the parallel capacitor forming uniform electric field can will be regarded as due to the combination approximation of described termination electrode 212 with described public electrode 13,22 or described suppression electrode 24, putting before this, electric field intensity between the two can calculate according to following formula, it may be assumed that
Wherein, U is described termination electrode 212 and public electrode 13,22 or suppresses the electric potential difference (voltage) between electrode 24, d is distance between the two, K is electrostatic force constant, Q is the quantity of electric charge that both apparent surfaces assemble, S is the area of both opposite segments, and ε is the dielectric constant of medium between the two.According to above-mentioned formula, distance between termination electrode 212 and suppression electrode 24 is more little, the electric field intensity of its formation is more big, due to the basic conservation of electric field energy, more electric field energy has been attracted in Y-axis negative direction side, so the electric field energy in Y-axis pros side reduces, and the electric field of its correspondence also can reduce accordingly.
Meanwhile, array base palte covers the dielectric constant (about 4.1) of alignment layer material polyimides (Polyamic, PI) of pixel electrode less than the material silicon nitride (SiN forming passivation layerx) dielectric constant (about 7.0).Therefore, the present embodiment is relative to the prior art shown in Figure 1B, at termination electrode away from an electrode side, distance d and DIELECTRIC CONSTANT ε all reduce, therefore, forming electric field component in the side region away from an electrode can increase accordingly, and the electric field component of Y-axis positive direction can reduce accordingly.
Due to the electric field component minimizing of the sensing Y-axis positive direction that the Liquid Crystal Molecules Alignment composition that Hui Dui AA district is corresponding affects, the phenomenon to mistake at the liquid crystal molecule of pixel edge negative pole can reduce or eliminate.
According to above-mentioned analysis, distance between described termination electrode 212 and suppression electrode 24 is more near, its electric field intensity is more big, more big in the reduction degree of the electric field component of the side (Y-axis positive direction) near electrode 211 side for described termination electrode 212, it is suppressed that more obvious to wrong effect.
Simultaneously, the width of described suppression electrode 24 has impact for the electromotive force of described suppression electrode 24 side 241 relative with termination electrode 212, resistance characteristic due to conductor material itself, it is suppressed that still can there is a degree of electric potential difference between marginal portion and the public electrode of electrode.The width of described suppression electrode 24 is more wide, and the electric potential difference between its marginal portion and public electrode 22 can be more little, and its electromotive force also can be more high, and thus itself and termination electrode 212 is more strong from the electric field between the side of an electrode side, and it suppresses more obvious to wrong effect.
Therefore, when design, it is possible to follow and suppress electrode 24 as far as possible near termination electrode 212 principle that makes its width wide as far as possible.
In another preferred implementation of the present embodiment, can so that distance between described suppression electrode and described termination electrode less than described passivation layer thickness to strengthen termination electrode further and to suppress the electric field between electrode, thus strengthening the effect reducing or eliminating to wrong phenomenon.
In another preferred implementation of the present embodiment, as shown in Figure 4, it is possible to form, by adjusting, the thickness suppressing electrode transparent conductive material layer so that suppress the electrode 44 thickness above the described passivation layer thickness more than described termination electrode 412.Suppressing the electrode 42 area in thickness its face relative with termination electrode 412 more big of Z-direction more big, the impact for termination electrode 412 electric field is also more big, and correspondingly, it reduces or eliminates the effect to wrong phenomenon also can be more preferably.
Fig. 3 A is the luminosity distribution schematic diagram of the pixel cell of the present embodiment that emulation obtains.Fig. 3 B is the luminosity distribution schematic diagram of the pixel cell of the prior art that emulation obtains.In figure, the gray scale of color represents the light luminance of this position, contrasts according to Fig. 3 A and Fig. 3 B it can be seen that the pixel cell of the present embodiment is uniform at the luminosity of marginal position, significantly reducing to wrong phenomenon of its liquid crystal molecule is described.And the Luminance Distribution that the emulation of existing pixel cell obtains is at marginal position uneven, illustrates that liquid crystal molecule exists comparatively serious in mistake phenomenon.And, by contrasting it can be seen that the pixel cell of the present embodiment significantly weakens relative to the electric field of the sensing Y-axis negative direction of the pixel cell of prior art, the end to the black region of mistake formation up shrinks.In figure, left side black region has been shrunk to original 1/2nd, and the right black region is shrunk to original 1/4th.To reducing of the black region of mistake formation so that the penetrance of pixel increases, and optical quality improves.
The present embodiment is by arranging the suppression electrode parallel with the termination electrode of pixel electrode, change the Electric Field Distribution in termination electrode surrounding vertical direction, the electric field component pointing to Y-axis negative direction is made to reduce or disappear, such that it is able to the arrangement of the liquid crystal molecule of stability contorting pixel cell edge visibility region, inhibit to wrong and disorderly row's phenomenon appearance, improve the display quality of FFS mode liquid crystal display.
Fig. 5 is the schematic diagram of the array base palte of the fringe field switching mode LCD of second embodiment of the invention.As it is shown in figure 5, array base palte 50 includes the grid line 51 of setting intersected with each other and data wire 52(is represented by dashed line in the drawings), described grid line 51 and data wire 52 limit pixel region 53.Described array base palte 50 also includes being arranged on the switching device 54(of described grid line 51 and data wire 52 crossover location and is represented by dashed line in the drawings), it is positioned at the pixel electrode 55 of described pixel region 53, covers the public electrode 56 of described array base palte；And it is arranged at the passivation layer 57 between pixel electrode 55 and public electrode 56.
Wherein, described pixel electrode 55 includes the electrode 551 that at least two be arranged in parallel and the termination electrode 552 connecting described strip shaped electric poles end.In Figure 5, described electrode 551 is formed strip.
Described public electrode 56 is plane-shape electrode.
Described array base palte 50 also includes suppressing electrode 58, described suppression electrode 58 is arranged on the described termination electrode 552 side away from described electrode 551, and described suppression electrode 58 extends in parallel setting near the limit of described termination electrode 552 side with described termination electrode 552, meanwhile, described suppression electrode 58 is electrically connected with described public electrode 56 by groove or the via offered on passivation layer 57.
In the present embodiment, pixel electrode 55, public electrode 56 and suppress electrode 58 to be transparency electrode, transparency electrode can pass through indium tin oxide (ITO), indium-zinc oxide (IZO), the combination of above-mentioned material or the manufacture of other transparent conductive materials.
It should be noted that an electrode shape of pixel electrode is except being formed as the strip shown in figure, it is also possible to for zigzag, fish bone well etc..
In a preferred implementation of the present embodiment, the width of described termination electrode 552 is formed 2-3.5 micron.The width of described electrode 551 is formed 2.2 microns.Described passivation layer 57 thickness is 0.2-0.3 micron.
The present embodiment array base palte can pass through after forming passivation layer 57, the multiple via of region etch between described termination electrode 552 correspondence position and pixel edges or the groove identical with described termination electrode 552 shape on passivation layer 57, then deposit transparency conducting layer again, and graphically form pixel electrode 55 and suppress electrode 58 and obtain.
Certainly, it will be understood by those skilled in the art that suppression electrode 58 can have the shape different from termination electrode, its size is not equally by the impact of termination electrode.
In a preferred implementation of the present embodiment, the width of described suppression electrode 58 is set to larger than 3.5 microns.
In another preferred implementation of the present embodiment, the shape of described suppression electrode 58 can also be formed different from termination electrode, for instance, the limit 242 away from described termination electrode side can be other shape, for instance fold-line-shaped or shaped form.
In another preferred implementation of the present embodiment, can so that distance between described suppression electrode and described termination electrode less than described passivation layer thickness to strengthen termination electrode further and to suppress the electric field between electrode, thus strengthening the effect reducing or eliminating to wrong phenomenon.
In another preferred implementation of the present embodiment, it is possible to form, by adjusting, the thickness suppressing electrode transparent conductive material layer so that suppress the electrode 58 thickness above the described passivation layer thickness more than described termination electrode 552.
The present embodiment is by arranging the suppression electrode parallel with the termination electrode of pixel electrode, change the Electric Field Distribution in termination electrode surrounding vertical direction, the electric field component pointing to Y-axis negative direction is made to reduce or disappear, such that it is able to the arrangement of the liquid crystal molecule of stability contorting pixel cell edge visibility region, inhibit to wrong and disorderly row's phenomenon appearance, improve the display quality of FFS mode liquid crystal display.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, to those skilled in the art, the present invention can have various change and change.Any amendment of making within all spirit in the present invention and principle, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (14)
1. a pixel cell for fringe field switching mode LCD, described pixel cell includes pixel electrode, public electrode and the passivation layer being arranged between pixel electrode and public electrode；
Described pixel electrode includes the electrode that at least two be arranged in parallel and the termination electrode connecting a described electrode tip；
Described pixel cell also includes suppressing electrode, described suppression electrode is arranged on the described termination electrode side away from described electrode, and described suppression electrode extends in parallel setting near the limit of described termination electrode side with described termination electrode, meanwhile, described suppression electrode is electrically connected with described public electrode by groove or the via offered on described passivation layer.
2. the pixel cell of fringe field switching mode LCD according to claim 1, it is characterised in that described suppression electrode is linear, fold-line-shaped or shaped form away from the limit of described termination electrode side.
3. the pixel cell of fringe field switching mode LCD according to claim 1, it is characterised in that the width of described suppression electrode is more than 3.5 μm.
4. the pixel cell of fringe field switching mode LCD according to claim 1, it is characterised in that described termination electrode width is 2～3.5 μm.
5. the pixel cell of fringe field switching mode LCD according to claim 1 a, it is characterised in that electrode for described pixel electrode is strip, zigzag or fishbone.
6. the pixel cell of fringe field switching mode LCD according to claim 1, it is characterised in that described pixel electrode, described public electrode and described suppression electrode are transparency electrode.
7. the pixel cell of fringe field switching mode LCD according to claim 1, it is characterised in that described suppression electrode thickness above described passivation layer is more than or equal to the thickness of described termination electrode.
8. an array base palte for fringe field switching mode LCD, including:
The grid line of setting intersected with each other and data wire, described grid line and data wire limit pixel region；
It is arranged on described grid line and the switching device of data wire crossover location；
It is positioned at the pixel electrode of described pixel region；
Cover the public electrode of described array base palte；And
It is arranged at the passivation layer between described pixel electrode and public electrode；
Wherein, described pixel electrode includes the electrode that at least two be arranged in parallel and the termination electrode connecting a described electrode tip；
Described array base palte also includes suppressing electrode, described suppression electrode is arranged on the described termination electrode side away from described electrode, and described suppression electrode extends in parallel setting near the limit of described termination electrode side with described termination electrode, meanwhile, described suppression electrode is electrically connected with described public electrode by groove or the via offered on described passivation layer.
9. the array base palte of fringe field switching mode LCD according to claim 8, it is characterised in that described suppression electrode is bar shaped, fold-line-shaped or shaped form away from the limit of described termination electrode side.
10. the array base palte of fringe field switching mode LCD according to claim 8, it is characterised in that described termination electrode width is 2～3.5 μm.
11. the array base palte of fringe field switching mode LCD according to claim 8, it is characterised in that the width of described suppression electrode is more than 3.5 μm.
12. the array base palte of fringe field switching mode LCD according to claim 8 a, it is characterised in that electrode for described pixel electrode is strip, zigzag or fishbone.
13. the array base palte of fringe field switching mode LCD according to claim 8, it is characterised in that described pixel electrode, described public electrode and described suppression electrode are transparency electrode.
14. the array base palte of fringe field switching mode LCD according to claim 8, it is characterised in that described suppression electrode thickness above described passivation layer is more than or equal to the thickness of described termination electrode.
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| CN104298036A (en) * | 2014-10-09 | 2015-01-21 | 深圳市华星光电技术有限公司 | Display panel and thin film transistor array substrate |
| CN104777653B (en) * | 2015-05-08 | 2017-12-12 | 厦门天马微电子有限公司 | Array base palte, liquid crystal display panel and liquid crystal display device |
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| US7623191B2 (en) * | 2006-09-19 | 2009-11-24 | Hannstar Display Corp. | Liquid crystal display devices |
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