CN103472634A - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN103472634A CN103472634A CN2012101885164A CN201210188516A CN103472634A CN 103472634 A CN103472634 A CN 103472634A CN 2012101885164 A CN2012101885164 A CN 2012101885164A CN 201210188516 A CN201210188516 A CN 201210188516A CN 103472634 A CN103472634 A CN 103472634A
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Abstract
The invention provides a liquid crystal display device. The liquid crystal display device comprises a liquid crystal layer which is arranged between a first substrate and a second substrate. The first substrate is provided with a plurality of electrode units; each electrode unit comprises a pixel electrode and a plurality of finger-shaped electrodes; each pixel electrode is provided with a first boundary and a second boundary which are adjacent; the finger-shaped electrodes are connected to the first boundary of the pixel electrode. The second substrate is provided with an opposite-direction electrode overlapped on the plurality of electrode units; the opposite-direction electrode comprises a hollowed pattern; the hollowed pattern comprises at least one first main slit and at least one second main slit which are mutually crossed; each second main slit is crossed with the second boundary; the distance between the crossed point of each second main slit and the second boundary and the crossed point of the first boundary and the second boundary along the second boundary is less than about 10 microns.
Description
Technical field
The invention relates to liquid crystal indicator, and particularly relevant for a kind of liquid crystal indicator that improves gray inversion.
Background technology
Liquid crystal indicator system utilizes liquid crystal molecule under different ordered states, and the characteristic that has different polarizations or refraction effect for light is controlled the amount of penetrating of light, and then makes liquid crystal indicator be produced image.Tradition stable twisted nematic (Twisted Nematic, TN) liquid crystal indicator, have good through characteristic, but be subject to the impact of liquid crystal molecule structure and optical characteristics, and its visual perspective is very narrow.Therefore how to allow display have wide viewing angle and high light utilization efficiency concurrently simultaneously, the counter plate display technique is caused to new breakthrough.
For head it off, recently the dealer has developed vertical orientation type (Vertical Alignment, VA) wide viewing angle liquid crystal display device, for example: figure vertical orientation type (Patterned Vertical Alignment, PVA) liquid crystal indicator, multiregional vertical align type (Multi-domain Vertical Alignment, MVA) liquid crystal indicator; Wherein the PVA type is to utilize fringing field effect and compensating plate to reach the purpose of wide viewing angle.As for the MVA type, be that a pixel is separated into to a plurality of zones, and the special pattern structure of use thrust or transparent conductive film of In-Sn oxide (ITO), the liquid crystal molecule that is positioned at zones of different can be toppled over towards different directions, therefore can reach wide viewing angle and the effect that promotes penetrance simultaneously.
Yet VA type liquid crystal indicator still has its shortcoming to be overcome at present.Referring to Fig. 1, it shows the top view of the liquid crystal layer of a known VA type liquid crystal indicator 100.When bestowing voltage to two electrode, liquid crystal molecule 102,104,106 is fallen down towards different horizontal direction 120,130 by electric field action separately, but a plurality of liquid crystal molecules 102,104 that are parallel to direction of an electric field (penetrating the direction of paper in figure) arrangement are all for example, fall down and reverse without level towards identical horizontal direction (direction 120), cause light can't penetrate these 120 liquid crystal molecules that fall down 102,104 under par side, make the brightness of VA type liquid crystal indicator descend to some extent.In addition, VA type liquid crystal indicator mainly still has the problem of gray inversion at present.In theory, liquid crystal indicator should be that grey is higher brighter from zero gray scale (black) to 255 gray scales (white), but liquid crystal indicator likely sees that in certain wide-angle low gray scale is also brighter than high gray scale on the contrary, namely see the phenomenon of similar black white reverse, what this phenomenon claimed is gray inversion.
At present, developed and added chirality (chiral) adulterant to add the technology of liquid crystal layer, overcome the problems referred to above.For example, referring to Fig. 2, it shows the top view of the liquid crystal layer of a known VA type liquid crystal indicator 200 containing chiral dopant.When bestowing voltage to two electrode, when bestowing voltage to two electrode, the liquid crystal molecule 202,204,206 of liquid crystal layer is fallen down towards different horizontal direction 220,230 by electric field action, but a plurality of liquid crystal molecules 202,204 that are parallel to direction of an electric field (penetrating the direction of paper in figure) arrangement all have different horizontal torsions, the birefringence (birefirengence) that causes light can see through liquid crystal molecule 202,204 penetrate all liquid crystal molecules.In addition, by adding chiral dopant, also can improve that these liquid crystal molecules 202,204 are not toppled over or dump angle mistake and the Optical Dark Solitary Pulse line that produces attenuates thin out.
Yet, although add the chiral dopant hardship to improve that liquid crystal molecule is not toppled over or the situation of dump angle mistake, the Optical Dark Solitary Pulse line is still obvious in the edge of pixel cell.What therefore, need at present is a kind of liquid crystal indicator that can improve these Optical Dark Solitary Pulse lines.
Summary of the invention
The invention provides a kind of liquid crystal indicator, comprise: a first substrate, it has a plurality of electrode units, wherein each electrode unit comprises a pixel electrode and a plurality of finger electrode, this pixel electrode has one first border and the second boundary that two-phase is faced, and these a little finger electrodes are connected in this first border of this pixel electrode; One second substrate, it has a subtend electrode and is overlapped on these a plurality of electrode units, this counter electrode comprises one and hollows out pattern, it comprises: at least one first main slit intersected each other and at least one second main slit, wherein this second main slit therewith the second boundary intersect, its plotted point along this second boundary so far the first border therewith the distance of the plotted point of the second boundary be less than approximately 10 μ m; And a liquid crystal layer, be located between this first substrate and this second substrate.
The embodiment of the present invention also provides a kind of liquid crystal indicator, comprise: a first substrate, it has a plurality of electrode units, wherein each electrode unit comprises a pixel electrode and a plurality of finger electrode, this pixel electrode has one first border and the second boundary that two-phase is faced, and these a little finger electrodes are connected in this first border of this pixel electrode, and wherein this first border comprises a folding line; One second substrate, it has a subtend electrode and is overlapped on these a plurality of electrode units, this counter electrode comprises one and hollows out pattern, and this hollows out pattern and comprises at least one first main slit and at least one second main slit intersected each other, and this second main slit therewith the second boundary intersect; And a liquid crystal layer, be located between this first substrate and this second substrate.
The accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 shows the top view according to the liquid crystal layer of known VA type liquid crystal indicator.
Fig. 2 shows the top view according to the liquid crystal layer of known VA type liquid crystal indicator.
The sectional view of the liquid crystal indicator that Fig. 3 is one embodiment of the invention.
Fig. 4 to 8 demonstration is according to the top view of the electrode pattern of the liquid crystal indicator of each embodiment.
The main element symbol description:
100 ~ liquid crystal indicator; 102 ~ liquid crystal molecule;
104 ~ liquid crystal molecule; 106 ~ liquid crystal molecule;
120 ~ horizontal direction; 130 ~ horizontal direction;
200 ~ liquid crystal indicator; 202 ~ liquid crystal molecule;
204 ~ liquid crystal molecule; 206 ~ liquid crystal molecule;
220 ~ horizontal direction; 230 ~ horizontal direction;
300 ~ liquid crystal indicator; 302 ~ first substrate;
304 ~ substrate; 306 ~ pixel electrode;
308 ~ second substrate; 312 ~ substrate;
314 ~ counter electrode; 320 ~ liquid crystal layer;
322 ~ the first compensate films; 324 ~ the first Polarizers;
326 ~ the second compensate films; 328 ~ the second Polarizers;
400 ~ pixel cell; 401 ~ electrode unit;
402 ~ pixel electrode; 410 ~ finger electrode;
412 ~ the first borders; The 412 ' ~ the first border;
412 " ~ the first border; 414 ~ the second boundary;
The 416 ~ three border; 422 ~ the first main slits;
424 ~ the second main slits; 500 ~ pixel cell;
501 ~ electrode unit; 600 ~ pixel cell;
601 ~ electrode unit; 700 ~ pixel cell;
701 ~ electrode unit; 830 ~ finger-like slit;
L1 ~ distance.
Embodiment
Below describe and be accompanied by the example of graphic explanation in detail with each embodiment, as reference frame of the present invention.In accompanying drawing or instructions description, similar or identical part is all used identical figure number.And in the accompanying drawings, the shape of embodiment or thickness can enlarge, and to simplify or convenient the sign.Moreover in accompanying drawing, the part of each element will be it should be noted that in figure the element that does not illustrate or describe to describe respectively explanation, it is form known to a person of ordinary skill in the art in affiliated technical field.
The object of the present invention is to provide a kind of liquid crystal indicator, it has high penetration in viewing area, and can improve the Optical Dark Solitary Pulse line phenomenon of the long limit edge that appears at pixel cell.In embodiments of the present invention, this pixel cell can be any one of blue pixel unit, green pixel unit and red pixel unit.
The sectional view of the liquid crystal indicator 300 that Fig. 3 is one embodiment of the invention.The liquid crystal indicator 300 of one embodiment of the invention can be vertical orientation (VA) type liquid crystal indicator.As shown in Figure 3, liquid crystal indicator 300 comprises and being oppositely arranged and a first substrate 302 and a second substrate 308 parallel to each other substantially.In an embodiment of the present invention, first substrate 302 can be considered a thin film transistor base plate, and it comprises a substrate, at least one pixel cell.Each pixel cell can comprise a pixel electrode 306 and a thin film transistor (TFT) (figure does not show), is arranged in substrate 304.In an embodiment of the present invention, substrate 304 is for example glass substrate.In addition, can be provided with black matrix" (figure does not show) between each pixel cell.
In one embodiment, liquid crystal indicator 300 can more comprise the first compensate film 322 and the first Polarizer 324, is arranged at first substrate 302 belows.In one embodiment, liquid crystal indicator 300 can more comprise the second compensate film 326 and the second Polarizer 328, is arranged at second substrate 308 tops.In one embodiment, the polarizing axis of the first Polarizer 324 and the second Polarizer 328 is orthogonal.
As shown in Figure 3, the liquid crystal layer 320 of liquid crystal indicator 300 is to be arranged between first substrate 302 and second substrate 308.In one embodiment, the liquid crystal molecule that liquid crystal layer 320 is used is nematic liquid crystalline material, and it can be the minus nematic crystal, also can be the eurymeric nematic crystal.And liquid crystal layer 320 is to be added with optically active substance, for example add chiral dopant (chiral dopants), so the liquid crystal molecule of liquid crystal layer 320 can thereby have optical activity along an axial torsion, this is axially the normal that is parallel to first substrate 302.
Fig. 4 is the top view according to the electrode pattern of the liquid crystal indicator of one embodiment of the invention.Fig. 4 shows electrode pattern overlapping of the electrode pattern of the pixel electrode 306 in a pixel cell 400 and counter electrode 314.The sectional view of liquid crystal indicator can be as shown in Figure 3.
Referring to Fig. 4, can comprise a plurality of electrode units 401 in pixel cell 400, wherein each electrode unit 401 can comprise pixel electrode 402 and a plurality of finger electrodes 410.Take Fig. 4 as example, electrically series connection between the pixel electrode 402 of each electrode unit.Pixel electrode 402 can comprise the first border 412 and the second boundary 414 and the 3rd border 416, and wherein the first border 412 is connected between the second boundary 414 and the 3rd border 416.For example, the first border 412 can with have an appointment the separately angle of 135 degree of the second boundary 414 and the 3rd border 416.Finger electrode 410 is connected in the first border 412 that pixel electrode 402 connects.In one embodiment, the first border 412 can be a straight line.Therefore by these finger electrodes 410 of design, can produce marginal electric field, and can improve the control ability of 406 pairs of liquid crystal layers of pixel electrode, particularly doped with the liquid crystal layer of chiral dopant.
Counter electrode is overlapped on electrode unit.Counter electrode can comprise one and hollow out pattern (except hollowing out pattern, counter electrode is in the drawings with transparent expression).This hollows out pattern can comprise at least one first main slit 422 and at least one second main slit 424, and it intersects each other.In one embodiment, this at least one first main slit 422 can intersect with the 3rd border 416, and this at least one second main slit 424 can intersect with the second boundary 414.In certain embodiments, this at least the first main slit 422 and make at least one second main slit 424 can mark off the 1st to the 4th quadrant district.For example, as shown in Figure 4, the top of the right side of the first main slit 422 and the second main slit 424 defines the 1st quadrant district, the top of the left side of the first main slit 422 and the second main slit 424 defines the 2nd quadrant district, the below of the right side of the first main slit 422 and the second main slit 424 defines the 3rd quadrant district, and the below of the left side of the first main slit 422 and the second main slit 424 defines the 4th quadrant district.In one embodiment, described finger electrode can be towards 45 °, 135 °, 225 °, 315 ° directions, to extend respectively in the 1st to the 4th quadrant.
In one embodiment, hollow out pattern and can optionally more comprise a plurality of finger-like slits 830, to promote the control ability of counter electrode to liquid crystal layer, for example, referring to Fig. 8.One end system of each finger-like slit 830 can be connected in the wherein one of the first main slit 422 and the second main slit 424, and in the 1st to the 4th quadrant that the first main slit and the second main slit are divided, respectively towards 45 °, 135 °, 225 °, 315 ° directions extensions.
The Optical Dark Solitary Pulse line is easy to occur in the boundary of pixel cell 400, and for example the second boundary 414.Yet, through experiment, find, while being designed to be less than certain value along the distance L 1 of the second boundary 414 to first borders 412 and the plotted point of the second boundary 414 as the plotted point by the second main slit 424 and the second boundary 414, can effectively eliminate the Optical Dark Solitary Pulse line in pixel cell 400.In one embodiment, this distance L 1 can be less than approximately 10 μ m.In another embodiment, this distance L 1 can be less than approximately 7 μ m, or particularly is less than approximately 5 μ m.
Referring to Fig. 5, it is the top view according to the electrode pattern of the liquid crystal indicator of one embodiment of the invention.Fig. 5 shows electrode pattern overlapping of the electrode pattern of the pixel electrode 306 in a pixel cell 500 and counter electrode 314.The sectional view of liquid crystal indicator can be as shown in Figure 3.In the present embodiment, the reference number identical with previous embodiment represents same or similar element.
In this embodiment, electrically series connection or electrically in parallel between the pixel electrode 402 of each electrode unit 501.
In this embodiment, distance L 1 can be less than approximately 10 μ m.Perhaps, this distance L 1 can be less than approximately 7 μ m, or particularly is less than approximately 5 μ m.
Referring to Fig. 6, it is the top view according to the electrode pattern of the liquid crystal indicator of one embodiment of the invention.Fig. 6 shows electrode pattern overlapping of the electrode pattern of the pixel electrode 306 in a pixel cell 600 and counter electrode 314.The sectional view of liquid crystal indicator can be as shown in Figure 3.In the present embodiment, the reference number identical with previous embodiment represents same or similar element.
In this embodiment, in order to make pixel cell, having preferably penetrance, is that the first border that is close to the pixel cell outside is designed to a folding line, and the first border that is close to pixel cell central authorities is designed to a straight line.As shown in Figure 6, in each electrode unit 601, one side of electrode unit 601 the first border 412 ' the first border of the outside of pixel cell 600 (for example near) be a folding line, and the first border 412 of electrode unit 601 opposite sides " the first border of the central authorities of pixel cell 600 (for example near) be still a straight line.In one embodiment, the angle on the first border 412 ' and the 3rd border 416 can be less than the angle of the first border 412 ' and the second boundary 414.For example, the angle on the first border 412 ' and the 3rd border 416 can be and is less than approximately 135 degree.In certain embodiments, the first border 412 ' can have discontinuous slope variation.0, the first border 412 on the other hand " since be still a straight line, can have an appointment the separately angle of 135 degree of itself and the second boundary 414 and the 3rd border 416.By design the first border 412 ', it is folding line, can make pixel electrode 402 there is larger area and there is preferably penetrance, and the L1 that can keep at a distance is less than certain value, for example be less than approximately 10 μ m or be less than approximately 7 μ m, or particularly be less than approximately 5 μ m, to eliminate the phenomenon of Optical Dark Solitary Pulse line.
In this embodiment, finger electrode 410 is connected in first border 412 ' and 412 of pixel electrode 402 ", and can in the first main slit 422 by counter electrode and the second main slit 424 the 1st to the 4th quadrant, be towards 45 °, 135 °, 225 °, 315 ° directions, to extend respectively.The hollowing out pattern and can optionally comprise a plurality of finger-like slits (figure show) of counter electrode.
Referring to Fig. 7, it is the top view according to the electrode pattern of the liquid crystal indicator of one embodiment of the invention.Fig. 7 shows electrode pattern overlapping of the electrode pattern of the pixel electrode in a pixel cell 700 and counter electrode.The sectional view of liquid crystal indicator 700 can be as shown in Figure 3.In the present embodiment, the reference number identical with previous embodiment represents same or similar element.
In this embodiment, electrode pattern is identical with Fig. 6 haply.Yet, there is better penetrance in order to make pixel cell 700, be that the first all border 412 that is positioned at electrode unit 701 is designed to folding line.In this embodiment, distance L 1 can be less than approximately 10 μ m.Perhaps, distance L 1 can be less than approximately 7 μ m, or particularly is less than approximately 5 μ m.
Consult annex, it shows the demonstration figure according to the pixel cell of various electrode pattern designs.Numbering A to E represents different liquid crystal indicators separately, except distance L 1 difference, has similar pixel electrode pattern and counter electrode pattern.The plotted point that distance L 1 is the second main slit in pixel cell and the second boundary is along the distance of the plotted point of the second boundary to the first border and the second boundary.As shown in annex, the distance L 1 of numbering A to C all is greater than approximately 10 μ m, therefore at the second boundary place near pixel cell, has obvious ox horn shape Optical Dark Solitary Pulse line.Yet in comparison, the liquid crystal indicator of numbering D and E has been used shorter distance L 1, therefore the hollowing out pattern and whether comprise as the finger-like slit of counter electrode no matter, all can obviously find out in pixel cell without obvious ox horn shape Optical Dark Solitary Pulse line.
Although the present invention discloses as above with preferred embodiment; so it is not in order to limit the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when doing a little modification and perfect, so protection scope of the present invention is worked as with being as the criterion that claims were defined.
Claims (14)
1. a liquid crystal indicator comprises:
One first substrate, it has a plurality of electrode units, wherein each electrode unit comprises a pixel electrode and a plurality of finger electrode, and this pixel electrode has one first border and the second boundary that two-phase is faced, and described finger electrode is connected in this first border of this pixel electrode;
One second substrate, it has a subtend electrode and is overlapped on the plurality of electrode unit, this counter electrode comprises one and hollows out pattern, it comprises: at least one first main slit intersected each other and at least one second main slit, wherein this second main slit and this second boundary intersect, and the distance of the plotted point of its plotted point along this second boundary to this first border and this second boundary is less than approximately 10 μ m; And
One liquid crystal layer, be located between this first substrate and this second substrate.
2. liquid crystal indicator as claimed in claim 1, is characterized in that, the distance of the plotted point of plotted point along this second boundary to this first border and this second boundary of this second main slit and the second boundary is less than approximately 5 μ m.
3. liquid crystal indicator as claimed in claim 1, is characterized in that, this first main slit and this second main slit mark off the 1st to 4 quadrants, and described finger electrode is in the 1st to 4 quadrants, respectively towards 45 °, 135 °, 225 ° and 315 ° of directions extensions.
4. liquid crystal indicator as claimed in claim 1, is characterized in that, this first border comprises a straight line, a folding line or aforesaid combination.
5. liquid crystal indicator as claimed in claim 4, is characterized in that, this pixel electrode also comprises one the 3rd border, and this first border is connected between the 3rd border and the second boundary; Wherein, when this first border is folding line, the angle on this first border and the 3rd border is less than the angle of this first border and this second boundary.
6. liquid crystal indicator as claimed in claim 5, is characterized in that, the angle on this first border and the 3rd border is less than 135 degree.
7. liquid crystal indicator as claimed in claim 1, is characterized in that, this liquid crystal layer is doped with chiral dopant.
8. a liquid crystal indicator comprises:
One first substrate, it has a plurality of electrode units, wherein each electrode unit comprises a pixel electrode and a plurality of finger electrode, this pixel electrode has one first border and the second boundary that two-phase is faced, and described finger electrode is connected in this first border of this pixel electrode, and wherein this first border is a folding line;
One second substrate, it has a subtend electrode and is overlapped on the plurality of electrode unit;
And a liquid crystal layer, be located between this first substrate and this second substrate.
9. liquid crystal indicator as claimed in claim 8, it is characterized in that, this counter electrode comprises one and hollows out pattern, this hollows out pattern and comprises at least one first main slit and at least one second main slit intersected each other, and this second main slit and this second boundary intersect, the distance of the plotted point of the plotted point of this second main slit and this second boundary along this second boundary to this first border and this second boundary is less than approximately 10 μ m.
10. liquid crystal indicator as claimed in claim 9, is characterized in that, the distance of the plotted point of the plotted point of this second main slit and this second boundary along this second boundary to this first border and this second boundary is less than approximately 5 μ m.
11. liquid crystal indicator as claimed in claim 8, is characterized in that, this first main slit and this second main slit mark off the 1st to 4 quadrants, and described finger electrode is in the 1st to 4 quadrants, respectively towards 45 °, 135 °, 225 ° and 315 ° of directions extensions.
12. liquid crystal indicator as claimed in claim 8, it is characterized in that, this pixel electrode also comprises one the 3rd border, and this first border is connected between the 3rd border and the second boundary, and the angle on this first border and the 3rd border is less than the angle of this first border and this second boundary.
13. liquid crystal indicator as claimed in claim 12, is characterized in that, the angle on this first border and the 3rd border is less than 135 degree.
14. liquid crystal indicator as claimed in claim 8, is characterized in that, this liquid crystal layer is doped with chiral dopant.
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| CN2012101885164A CN103472634A (en) | 2012-06-08 | 2012-06-08 | Liquid crystal display device |
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| CN2012101885164A CN103472634A (en) | 2012-06-08 | 2012-06-08 | Liquid crystal display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10809579B2 (en) | 2014-04-29 | 2020-10-20 | Samsung Display Co., Ltd. | Liquid crystal display |
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| JP2006276357A (en) * | 2005-03-29 | 2006-10-12 | Sanyo Epson Imaging Devices Corp | Liquid crystal apparatus and electronic equipment |
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Application publication date: 20131225 |