CN101726941B - Vertical alignment liquid crystal display and pixel structure thereof - Google Patents
Vertical alignment liquid crystal display and pixel structure thereof Download PDFInfo
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Abstract
The present invention discloses a homeotropic liquid crystal display and a pixel structure thereof. The homeotropic liquid crystal display comprises an upper substrate and a lower substrate; two pixels are defined by two data lines of the lower substrate and every two scanning lines; each pixel comprises a pixel electrode and a transistor; a slot is kept between the pixel electrodes of the two pixels; and a bias electrode is arranged below the slot; wherein the bias electrode has a voltage valve VE; the pixel electrode has a voltage valve VP, and when the voltage value is in a positive frame, VP is larger than VE, and when the voltage value is in a negative frame, VP is less than VE.
Description
Technical field
The present invention relates to a kind of homeotropic liquid crystal display, particularly a kind of dot structure of homeotropic liquid crystal display.
Background technology
The LCD of vertical orientation (Vertical Alignment) type, multi-zone vertical alignment nematic (MVA for example, Multi-domain Vertical Alignment), change liquid crystal molecule and be the angle of visibility of non-single direction arrangement, and shorten the reaction time with the raising display.
Fig. 1 shows a kind of known homeotropic liquid crystal display.In Fig. 1, in order to change the orientation of liquid crystal molecule 12, on the surface that pixel electrode 4 is deposited on lower-glass substrate 2 after, above pixel electrode 4, be formed for the projection 6 of orientation control; Equally, when making colored filter, also below upper glass substrate 14 and common electrode 10, make projection 8.Like this, the arrangement of liquid crystal can be subjected to the influence of projection 6,8 and present the state of inclination a little, after pixel electrode 4, common electrode 10 energisings, can produce the transverse electric field of dotted line as shown in the figure, liquid crystal molecule 12 be tilted toward different directions with the distribution of person's projection 6,8, thereby increase angle of visibility.
Fig. 2 has shown another kind of known homeotropic liquid crystal display, and its structure and Fig. 1 are similar, and different places is not make projection 6 on pixel electrode 4, but carries out etch process so that pixel electrode 4 in position forms opening 16.And, still make the projection 8 that staggers with the opening relative position at the lower surface of common electrode 10.Like this, after 10 energisings of pixel electrode 4 and common electrode, can produce the transverse electric field of dotted line as shown in the figure, make liquid crystal molecule 12 tilt thereby increase angle of visibility toward different directions with the distribution of person's projection 8 and opening 16.
On the other hand, traditional LCD constitutes driving circuit by many orthogonal sweep traces and data line, wherein data line is driven by data driver (data driver or source driver), and scanning linear is driven by scanner driver (scan driver or gate driver).Because resolution improves, the quantity of the related data driver of data line also increases, and makes cost improve, and in order to reduce cost, the quantity of data line must reduce.
Fig. 3 shows a kind of dot structure of known LCD, for illustrated succinct, only shows the lower-glass substrate, i.e. the top view of transistor substrate part.The adjacent shared same data line of two pixel electrodes of each row in the drawings, for example, pixel electrode P1 and pixel electrode P2 are shared data line S2, pixel electrode P3 and P4 is then shared data line S3.In addition, two adjacent pixel electrodes of each row but connect different sweep traces, and for example, adjacent two pixel electrode P1 are connected sweep trace G1, pixel electrode P2 and connect sweep trace G2 with the pixel electrode P1 of P2.
In addition, No. 548615, TaiWan, China patent, be entitled as " display panel with driving circuit of three neighbor shared data lines " and disclose a kind of three adjacent pixel electrodes and optionally driven by the shared data line via first switches set, second switch group, the 3rd switches set, the quantity of data line further reduces.
The technology of two adjacent pixel electrodes of aforementioned each row or three adjacent pixel electrodes shared data lines all can be applicable to the LCD of vertical orientation type.But, no matter utilize projection or opening in pixel region, to increase transverse electric field, the difficulty that runs in the application is the configuration between pixel electrode and pixel electrode, the for example configuration between pixel electrode P2 and the pixel electrode P3 among Fig. 3, interelectrode fringe field size of necessary considered pixel and cross-talk (crosstalk), in order to make liquid crystal molecule have bigger angle of inclination, fringe field must be enough powerful, in order to reduce cross-talk, the distance between pixel electrode is increased.But the distance between the pixel electrode increases makes aperture opening ratio reduce, and fringe field is still big inadequately, cross-talk still can't reduce to gratifying degree.
Therefore, for the LCD of vertical orientation type, needing badly provides a kind of new dot structure, and the dot structure of particularly adjacent a plurality of pixel electrode shared data lines can improve the disappearance of known technology.
Summary of the invention
The object of the present invention is to provide a kind of vertical alignment type liquid crystal display device and dot structure thereof, so that increase pixel aperture ratio, increase fringe field, minimizing reaction time, minimizing cross-talk.
According to above-mentioned purpose, the invention provides a kind of vertical alignment type liquid crystal display device and dot structure thereof, comprise the last substrate that is used to make colored filter, and be used to make transistorized down substrate, per two data lines of following substrate and two pixels of per two sweep traces definition, each pixel comprises pixel electrode and transistor, has slit between the pixel electrode of two pixels, and it is arranged with bias electrode; Wherein, bias electrode has magnitude of voltage V
E, pixel electrode has magnitude of voltage V
P, be V when (positiveframe) at magnitude of voltage
PV
E, V when magnitude of voltage is negative value (negative frame)
P＜V
E
Description of drawings
Fig. 1 has shown known vertical alignment type liquid crystal display device to Fig. 3;
Fig. 4 has shown the vertical alignment type liquid crystal display device and the dot structure thereof of the embodiment of the invention to Figure 13.
Embodiment
Fig. 4 shows the dot structure of the vertical alignment type liquid crystal display device of the embodiment of the invention, wherein dot structure comprises the last substrate that is used to make colored filter and is used to make transistorized substrate down, but, only show the part top view of substrate 30 down among the figure for illustrated succinct.The following substrate 30 of its dot structure of vertical alignment type liquid crystal display device of the embodiment of the invention comprises many data lines that mutually orthogonal arranges (S1-S3) and multi-strip scanning line (G0-G5) for example for example, per two data lines and two pixels of per two sweep traces definition, each pixel comprises pixel electrode (P1-P8) and transistor (T0-T8) for example for example, transistor comprises grid, source electrode, drain electrode, this pixel electrode is connected with this transistor drain, connect sweep trace via transistorized grid, connect data line via transistorized source electrode, wherein, the shared data line of two adjacent pixel electrodes of each row, for example pixel electrode P1 and electrode P2 are shared data line S2, pixel electrode P3 and P4 are then shared data line S3.In addition, two adjacent pixel electrodes of each row but connect different sweep traces, for example, adjacent two pixel electrode P1 and P2, pixel electrode P1 connects sweep trace G1, and pixel electrode P2 connects sweep trace G2.In addition, below the slit between two data lines and two defined two pixel electrodes of sweep trace, (for example E1-E2), bias electrode can reach increases aperture opening ratio, increase fringe field, reduce the purpose of cross-talk to dispose bias electrode.
It should be noted that, the position of limit transistor not in Fig. 4 and among other embodiment of the present invention, in order to respond different type of drive, for example row counter-rotating (row inversion), some counter-rotating (dotinversion), row counter-rotatings (column inversion), frame counter-rotating (frame inversion), transistor can be formed on other position.For example, can change into the transistor T 6 of sweep trace G3 and be connected data line S2 and sweep trace G4, and can change into the transistor T 5 of sweep trace G4 and be connected data line S1 and sweep trace G3 connecting data line S1 in the drawings with connecting data line S2 in the drawings.In addition, bias electrode (E1, E2) is not limited to be applied in the situation of adjacent two pixel shared data lines, also can be applicable to adjacent a plurality of pixel, the situation of for example adjacent three pixel shared data lines.
Fig. 5 is the sectional view of Fig. 4 in A-A ' direction, and adds last substrate 32 parts of dot structure of the vertical alignment type liquid crystal display device of the embodiment of the invention.The below of last substrate 32 forms colored filter 34, colored filter 34 is formed the array that is made of a plurality of colors by a plurality of look resistance 36 (color resist), (B1-B3) separate, black matrix have shading and the effect that improves contrast and two adjacent look resistances 36 are by black matrix; And, below colored filter 34, form common electrode 38.On the position, look resistance 36 is corresponding to the pixel electrodes (P7, P8) of substrate 30 down, and (B1-B3) is corresponding to data line or sweep trace (for example data line S2 and S3) and at the slit that constitutes between two pixel electrodes (for example slit C2 between pixel electrode P7 and the P8) for black matrix.In addition, bias electrode E2 is arranged on the below of slit C2.
As shown in Figure 5, in the present embodiment, the width of bias electrode E2 is greater than the width of slit C2, and the width of black matrix B 2 is greater than the width of bias electrode E2.But in other embodiments, the width of bias electrode E2 can equal the width of slit C2; Perhaps, the width of black matrix B 2 equals the width of bias electrode E2, the latter's situation such as another embodiment of the present invention shown in Figure 6, and Fig. 6 is that with the difference of Fig. 5 the width of black matrix B 2 and bias electrode E2 is different, all the other features are identical with Fig. 6.Notice that the width of black matrix B 2 can be different from the width of black matrix B 1 and B3.In addition, in the present embodiment, bias electrode E2 and data line S2, S3 belong to same one deck, and just, bias electrode E2 can finish in same manufacturing course with data line S2, S3 and both can have same material.In addition, other element not shown in the figures comprises: the grid that is positioned at the substrate top; Be positioned at the insulation course of grid top; Be configured in the drain electrode, source electrode and the data line that are positioned at the insulation course top with one deck; Be positioned at the protective layer of drain electrode, source electrode and data line top; Be arranged on the liquid crystal layer between substrate 32 and the following substrate 30; And the alignment film that is configured in common electrode 38 belows and pixel electrode (P7, P8) top respectively helps Liquid Crystal Molecules Alignment.
Because bias electrode E2 can have the effect of shading, in another embodiment of the present invention, change into the black matrix B 2 of bias electrode E2 replacement and come shading, shown in the embodiment of Fig. 8 of the present invention, above bias electrode E2, do not dispose black matrix B 2.
In embodiments of the present invention, bias electrode, for example the current potential that has of E2 is V
E, have identical current potential with common electrode 38, and have current potential V such as the pixel electrode of P7 and P8
P, find via experiment, in order to increase between the pixel electrode, the fringe field between P7 and the P8 for example, V
PBe greater than V
E, be V when (positive frame) just at magnitude of voltage
PV
E, V when magnitude of voltage is negative value (negative frame)
P＜V
E
Key character of the present invention is that bias electrode is configured in the slit below between the pixel electrode, and in order in the pixel region of vertical alignment type liquid crystal display device, to increase transverse electric field, naturally can known technology is additional in the present invention.For example, Fig. 8 shows another embodiment of the present invention, and the difference of itself and Fig. 7 embodiment is, has projection 40 in the below of the common electrode 38 (perhaps alignment film) of last substrate 32, to increase the angle of inclination of liquid crystal molecule.In other embodiments, common electrode 38 has a plurality of openings, and collocation pixel electrode P7, P8 have projection 40 or a plurality of opening, makes that the transverse electric field in the pixel region increases.In the embodiment of Fig. 9, be with the difference of Fig. 8 embodiment, below proximity data line S2, S3, has guarded electrode 42, guarded electrode 42 and grid, the same one deck of sweep trace provide good shield effectiveness, reduce the cross-talk between pixel electrode P7, P8 and data line S2, S3.Features such as above-mentioned Fig. 8, Fig. 9 also can be added among other embodiment of any the present invention.
Figure 10 to Figure 13 has shown some kinds of embodiments of the invention, with before each embodiment components identical with identical symbolic representation, the part that embodiment is identical repeats no more, and different parts only is described.Referring to Figure 10, bias electrode (length of E1-E4) approximately with pixel electrode (length of slit is identical between P0-P8), and bias electrode do not cross over sweep trace (G0-G5), in this embodiment, bias electrode and sweep trace, grid belong to same one deck, are positioned at the below of data line.Give bias electrode between each pixel electrode in order to supply voltage, can connect each bias electrode in that a transverse electrode (not shown) is set with one deck.
Referring to Figure 11, bias electrode (E1-E2) and data line (and S1-S3) is positioned at same one deck, bias electrode cross over sweep trace (G0-G5) so that the bias electrode under the slit between each row pixel electrode be connected to each other.In addition, each pixel electrode (can form a plurality of openings in the P0-P8), to increase transverse electric field, the angle of inclination of liquid crystal molecule be increased.Shape, position that it should be noted that opening are without limits.
Referring to Figure 12, bias electrode (E1-E2) and data line (and S1-S3) is positioned at same one deck, bias electrode cross over sweep trace (G0-G5) so that the bias electrode under the slit between each row pixel electrode be connected to each other; Simultaneously, each pixel electrode (can form a plurality of openings in the P0-P8), to increase transverse electric field, the angle of inclination of liquid crystal molecule be increased; And (E1-E2) also extends to the below of a plurality of openings in the pixel electrode to bias electrode, can increase field effect like this, increases the angle of inclination of liquid crystal molecule and reduces the reaction time.
Referring to Figure 13, the length of bias electrode (E1E4) approximately with pixel electrode (length of slit is identical between P0-P8), and bias electrode do not cross over sweep trace (G0-G5), in this embodiment, bias electrode and grid, sweep trace belong to same one deck, are positioned at the below of data line.In order to supply voltage, can a transverse electrode (not shown) be set with one deck to connect each bias electrode to the bias electrode between each pixel electrode; Simultaneously, can form a plurality of openings in each pixel electrode,, the angle of inclination of liquid crystal molecule be increased to increase transverse electric field; And (E1-E4) also extends to the below of a plurality of openings in the pixel electrode to bias electrode, can increase field effect like this, increases the angle of inclination of liquid crystal molecule and reduces the reaction time.
According to enforcement notion of the present invention, because bias electrode brings good shielding effect (shieldingeffect), can reduce by two cross-talk between pixel electrode, make that the distance of slit can shorten between two pixel electrodes.In known technology, the width of slit approximately is 8 to 10 μ m, and in the embodiment of the invention, it is between 4 to the 8 μ m that the width of slit can reduce at least, and in one embodiment, the width of slit is 6 μ m.In addition, because the voltage V of pixel electrode
PVoltage V greater than bias electrode
E, make fringe field under the prerequisite that does not change direction of an electric field, strengthened the former electric field intensity that pre-exists, reduce the reaction time of liquid crystal molecule, and improved other relevant defective, for example finger pressure defective (touchmura) or the like.In addition, owing to can reduce distance between pixel electrode, can reduce the area of black matrix, aperture ratio of pixels is improved.
The above is the preferred embodiments of the present invention only, is not in order to limit claims of the present invention; And the equivalence of being done under the situation of claims of the present invention not changes with revising and all should be included in claims of the present invention.
Claims (15)
1. the structure of a vertical alignment type liquid crystal display device comprises:
Last substrate; And
Following substrate, described substrate down comprises by multi-strip scanning line and many pixel electrode arrays that data line constitutes, wherein per two data lines and two pixels of per two sweep traces definition, each pixel comprises pixel electrode and transistor, have slit between the pixel electrode of described two pixels, divide into the offset piezoelectricity utmost point at described slit;
Wherein, described bias electrode has magnitude of voltage V
E, the pixel electrode of described two pixels has magnitude of voltage V
P, magnitude of voltage be on the occasion of the time V
P＞V
E, V when magnitude of voltage is negative value
P＜V
E
2. structure as claimed in claim 1, wherein said transistor comprises grid, source electrode, drain electrode, described pixel electrode is connected with described drain electrode, described grid is connected with sweep trace, described source electrode is connected with data line, and substrate comprises common electrode on described, and described common electrode has magnitude of voltage V
C, and described V
CEqual described V
E
3. structure as claimed in claim 2, the wherein said substrate of going up still comprises the colored filter that is arranged at the substrate below, described colored filter is formed the array that is made of a plurality of colors by a plurality of look resistances, two adjacent look resistances separate with black matrix, and described common electrode is arranged on described colored filter below, wherein each described look resistance is corresponding to a described pixel electrode, and black matrix is corresponding to the described slit between data line or two the described pixel electrodes.
4. structure as claimed in claim 3, wherein said black matrix be corresponding to described data line, and the described slit between described two pixel electrodes and do not correspond to black matrix.
5. structure as claimed in claim 3, the width of wherein said bias electrode be more than or equal to the width of described slit, corresponding to the width of the black matrix of the described slit width more than or equal to described bias electrode.
6. structure as claimed in claim 2 has a plurality of projections in each pixel region of wherein said common electrode below or has a plurality of openings to increase the angle of inclination of liquid crystal molecule.
7. structure as claimed in claim 2 wherein has a plurality of projections in each described pixel electrode or has a plurality of openings to increase the angle of inclination of liquid crystal molecule.
8. structure as claimed in claim 1, wherein said bias electrode and described multi-strip scanning line are positioned at same one deck, the length of the slit between the length of described bias electrode and the pixel electrode is identical, and described bias electrode do not cross over sweep trace, and transverse electrode connects described bias electrode.
9. structure as claimed in claim 8 has a plurality of openings in wherein every described pixel electrode.
10. structure as claimed in claim 9, wherein said bias electrode also extend to the below of a plurality of openings in the described pixel electrode.
11. structure as claimed in claim 1, wherein said bias electrode and many data line bits are in same one deck, described bias electrode crosses over sweep trace so that each bias electrode under the slit between each row pixel electrode is connected to each other, and simultaneously, has a plurality of openings in each pixel electrode.
12. structure as claimed in claim 11, wherein in each described pixel electrode, described bias electrode also extends to the below of a plurality of openings in the described pixel electrode.
13. structure as claimed in claim 1 also comprises the guarded electrode that is arranged on the below that is close to described many data lines, described guarded electrode and described multi-strip scanning line are positioned at same one deck.
14. structure as claimed in claim 1, the width of wherein said slit are between 4 to the 8 μ m.
15. structure as claimed in claim 14, the width of wherein said slit are 6 μ m.
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| CN101958102B (en) * | 2010-09-15 | 2013-01-09 | 昆山工研院新型平板显示技术中心有限公司 | Active matrix organic light-emitting display with shared data line structure |
| CN102722043B (en) * | 2011-03-30 | 2014-11-05 | 瀚宇彩晶股份有限公司 | Vertical alignment liquid crystal display device |
| CN102207656A (en) * | 2011-03-30 | 2011-10-05 | 友达光电股份有限公司 | Pixel array of fringe field switching liquid crystal display panel and driving method thereof |
| TWI444729B (en) * | 2011-10-06 | 2014-07-11 | Hannstar Display Corp | Liquid crystal display |
| CN106125423A (en) * | 2016-06-21 | 2016-11-16 | 上海纪显电子科技有限公司 | Liquid crystal indicator, array base palte and preparation method thereof |
| CN109298567B (en) * | 2017-07-24 | 2021-01-19 | 京东方科技集团股份有限公司 | Array substrate, display device and driving method thereof |
| CN109523972A (en) * | 2018-12-24 | 2019-03-26 | 惠科股份有限公司 | Array substrate and display panel |
| CN111103732B (en) * | 2020-01-15 | 2022-08-23 | 深圳市华星光电半导体显示技术有限公司 | Display panel mother board |
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