CN100523929C

CN100523929C - LCD device

Info

Publication number: CN100523929C
Application number: CNB2007100863699A
Authority: CN
Inventors: 邱俊昌; 叶旭成
Original assignee: AU Optronics Corp
Current assignee: Optoelectronic Science Co ltd
Priority date: 2006-03-15
Filing date: 2007-03-15
Publication date: 2009-08-05
Anticipated expiration: 2027-03-15
Also published as: CN101021636A

Abstract

The invention provides a liquid crystal display having one or more pixels, each pixel includes a first pixel operated in a first threshold voltage; and a second pixel adjacent to the first pixel and operated in a second threshold voltage; wherein the first pixel is divided into two portions by the second pixels so as to form at least four regions of liquid crystal numerators, the four regions irradiate in different gray levels thereby improving an appearance characteristic of the liquid crystal display.

Description

LCD

Technical field

The present invention relates to a kind of LCD, and be particularly related to a kind of LCD with compensation pixel array (compensated pixel arrays).

Background technology

LCD is a kind of display device of thin and plane, and it comprises a plurality of with the pixel of array format before light source or reflection sources, and each pixel all comprises one deck liquid crystal molecule between two electrodes.When voltage puts on electrode, cause liquid crystal molecule to reverse the electrostatic force of (twist) generation, and the light that can cause by liquid crystal molecule that reverses of liquid crystal molecule reverses, and then the light that allows (or not allowing) various angles is by light filter (filter).Therefore, by being positioned at the pixel display image of row (column) and row (row).

Fig. 1 illustrates known pel array 100, and each pixel 102 comprises for the first time pixel 104 and pixel 106 for the second time, and for the first time pixel 104 and for the second time pixel 106 separate by the slit 120 that is formed between the two.In order to improve viewing angle characteristic, first and second time pixel 104,106 is usually designed to has different threshold value (threshold) voltage, so, when first and second time pixel 104,106 was luminous, first and second time pixel 104,106 can be recharged under saturated in difference (saturation) voltage.Because different saturation voltages causes the liquid crystal molecule in first and second time pixel 104,106 to have different orientation (orientation direction), therefore can improve viewing angle characteristic.

In order further to improve viewing angle characteristic, each time pixel 104 is split into a plurality of zones, and liquid crystal molecule has different orientations in these zones, and for example, inferior pixel 104 is divided into three parts by protuberance 108 and 110.Thus due to the geometric figure of three parts, the liquid crystal molecule of upper left quarter has the orientation of arrow 112, the liquid crystal molecule of lower left quarter has the orientation of arrow 114, and the liquid crystal molecule of the right first half has the orientation of arrow 116, and the liquid crystal molecule of the right Lower Half has the orientation of arrow 116.The orientation of each part defines a zone, because of this time pixel 104 has four zones.

Viewing angle characteristic can be improved by above-mentioned zones of different.Fig. 2 illustrates time pixel 104 section Figure 200 along the A-A line.When

electrode

202 and 204 is recharged, protuberance 108 makes the liquid crystal molecule on the right along a direction orientation, and the liquid crystal molecule on the left side is along another direction orientation.By this, top 206, upper right quarter 208, and upper left quarter 210 can receive the light of equal number, in other words, have light transmittance (transmittance) relatively uniformly in different visual angles pixel 104 next time.

One of shortcoming of known pixels array 100 is that protuberance and slit lower aperture opening ratio (apertureratio), and aperture opening ratio is the elemental area of penetrable light and the ratio of the real area of pixel.Being familiar with this skill person can understand, and many more protuberances and slit cause low more aperture opening ratio.As shown in Figure 1, inferior pixel 104 and 106 is separated by slit 120, and each time pixel has two protuberances, the reason that this promptly causes pixel 102 aperture opening ratios to descend.

Fig. 3 illustrates another known pel array 300, and each pixel 302 comprises the pixel 304 and the pixel second time with higher threshold voltage first time that has than low threshold voltage.As shown in FIG., each

time pixel

304 or 306 has only a protuberance, so the aperture opening ratio of pixel 302 can be improved.

One of shortcoming of known pel array 300 is arranged for its pixel and is also caused brightness disproportionation (mura) phenomenon, brightness disproportionation to be meant the uneven image of generation on large-area pixel.Please refer to Fig. 3～4, seen by the right of known pel array 300, inferior pixel 402 of some row is owing to liquid crystal alignment and apparent darker.Inferior pixel 306 has higher threshold voltage, so can compare dark when it is luminous; Inferior pixel 304 has lower threshold voltage, so can be brighter when it is luminous.Forms because row 404 are inferior pixels 306 by high threshold voltage, so row 404 are understood apparent darker; And row 406 to be inferior pixels 304 by low threshold voltage form, so row 406 can show brighter.So, produce dark bright band and intermesh, this is the brightness disproportionation defective.

Because above-mentioned reason is needed a kind of liquid crystal indicator at present badly, it has the pel array that high aperture can be provided, and can avoid the brightness disproportionation defective simultaneously.

Summary of the invention

The object of the present invention is to provide a kind of liquid crystal indicator, it has the pel array that high aperture can be provided, and can avoid the brightness disproportionation defective simultaneously.

The invention provides a kind of LCD, it has one or more pixels, and each pixel comprises: pixel for the first time, and voltage-operated with first threshold; And pixel for the second time, in abutting connection with this pixel and operate for the first time with second threshold voltage; Wherein this first time pixel by this second time pixel be divided into two parts to form the zone of at least four liquid crystal molecules, these four zones are luminous with different GTGs, use the viewing angle characteristic that improves this LCD.

The present invention provides a kind of LCD in addition, and it has one or more pixels, and each pixel comprises: pixel for the first time, and voltage-operated with first threshold; And pixel for the second time, in abutting connection with this pixel and operate for the first time with second threshold voltage, this first and second time pixel is divided to form the zone of four liquid crystal molecules at least, and these four zones are luminous with different GTGs, use the viewing angle characteristic that improves this LCD; Wherein any horizontal cross-section of this pixel comprises this of pixel and this of pixel of at least a portion of at least a portion first time second time, and any vertical section of this pixel comprises this of pixel and this of pixel of at least a portion of at least a portion first time second time.

The present invention provides a kind of LCD again, it has pel array, and this pel array comprises: first pixel has pixel and pixel for the first time for the second time, this for the second time pixel in abutting connection with this pixel for the first time, wherein this first time pixel by this second time pixel be divided into first and second part; Second pixel, in abutting connection with this first pixel, this second pixel has pixel and the 4th pixel for the third time, the 4th pixel be in abutting connection with this pixel for the third time, wherein this for the third time pixel be divided into the 3rd and the 4th part by the 4th pixel; Wherein this second and the 4th pixel is voltage-operated with first threshold, this first and for the third time pixel operate with second threshold voltage; Perhaps this second and third time pixel is voltage-operated with this first threshold, and this first and the 4th pixel is with this second threshold voltage operation.

Description of drawings

Fig. 1 illustrates known pel array;

Fig. 2 illustrates the sectional view of known pixels array;

Fig. 3 illustrates another known pel array;

Fig. 4 illustrates the known pel array with brightness disproportionation defective;

Fig. 5 illustrates the pel array 500 according to the embodiment of the invention;

Fig. 6 illustrates the pel array 600 according to the embodiment of the invention;

Fig. 7 illustrates the pel array 700 according to the embodiment of the invention; And

Fig. 8 illustrates the pel array 800 according to the embodiment of the invention.

Description of reference numerals

100 pel arrays, 102 pixels

104,106 pixel 108,110 protuberances

112,114,116,118 alignment direction, 120 slits

200 sectional views, 202,204 electrodes

206 tops, 208 upper right quarters

210 upper left quarters, 300 pel arrays

304,306 pixels of 302 pixels

402 row, 404,406 row

500 pel arrays, 502 pixels

508,510,512 partial pixels, 514,516 slits

518,520,522,524 alignment direction, 600 pel arrays

602 pixels, 604,606,608,610 zones

700 pel arrays, 702 pixels

704,706,708,710 regional 800 pel arrays

802 pixels, 808,810,812 partial pixels

814,816 slits, 818,820,822,824 alignment direction

Embodiment

Please refer to Fig. 5, it illustrates the pel array 500 according to the embodiment of the invention.Pel array 500 can be applicable to various types of liquid crystal displays (LCD) device, for example vertically aligned (vertically-aligned, VA) LCD or stable twisted nematic (twisted-nematic, TN) LCD.Pel array 500 comprises the pixel of a plurality of rectangles, and each pixel is divided into pixel two times.Each pixel further is divided into a plurality of zones, and the liquid crystal molecule in these zones is along different direction orientations.In one embodiment, pixel 502 is divided into the pixel 508,510 and 512 of three parts by slit 514 and 516.Slit 514 extends to a jiao of pixel 502 opposite sides from the mid point of pixel 502 1 sides, and slit 516 extends to another angle of pixel 502 opposite sides from the mid point of pixel 502 1 sides.

Partial pixel

508 and 510 electricity connect, and partial pixel 512 is not connected with

partial pixel

508 and 510 electricity.Therefore,

partial pixel

508 and 510 forms pixel for the first time, and partial pixel 512 forms pixel for the second time.The liquid crystal molecule of partial pixel 508 is along the direction orientation of arrow 518, and the liquid crystal molecule of partial pixel 510 is along the direction orientation of arrow 520.Because due to the geometric figure of

slit

514 and 516, the liquid crystal molecule of the first half of partial pixel 512 is along the direction orientation of arrow 522, the liquid crystal molecule of the Lower Half of partial pixel 512 is along the direction orientation of arrow 524.Ground area definition one zone with identical liquid crystal alignment.As shown in Figure 5, pixel 502 has four zones, and the viewing angle characteristic of pixel 502 can be improved in these zones.Pixel 502 only has two

slits

514 and 516, the known pixels 102 in Fig. 1, and pixel 102 has four protuberances and a slit.Therefore the aperture opening ratio of pixel 502 obviously improves.

Partial pixel

508 and 510 is designed to have lower threshold voltage, and 512 of partial pixels have higher threshold voltage.Being arranged in the pixels all in the pel array 500 of high low threshold voltage part like this repeats.As shown in Figure 5, dash area is represented the high threshold voltage part, and non-shaded portion is represented the low threshold voltage part.Have illustrate dash area with horizontal line pixel by anodal charging, have the pixel that illustrates dash area with perpendicular line and then charge by negative pole.In order to prolong the life-span of pixel, the polarity of charging can change.Because the difference of polarity is utilized the pixel of anodal charging and is utilized the pixel of negative pole charging may have slight different GTG (gray level).

Please refer to Fig. 6, it illustrates the pel array of watching when from the left side of the pel array of Fig. 5.Because the orientation of liquid crystal molecule, the upper area 604 in each pixel 602 and 606 bright than lower area 608 and 610.Because

zone

604 and 610 is positioned at pixel for the first time, and zone 606 and 608 is positioned at pixel for the second time, therefore zone 604,610 with regional 606,608 by different driven.Zone 604 has lower threshold voltage, and zone 606 is bright, identical for it, and zone 610 has lower threshold voltage, and zone 608 is bright for it.By this, each pixel comprises four zones with different GTGs.Unshaded zone is the brightest zone, and the zone that illustrates shade with level or perpendicular line is medium bright zone, and the zone that illustrates shade with grid pattern is dark space, and the zone that illustrates shade with oblique line is the zone of medium dark.As shown in Figure 6, the brightest, medium bright, medium dark and the darkest zone are mixed and are formed in the entire pixel array 600.By this, pel array 600 can not produce staggered dark bright band as shown in Figure 4, and then eliminates the brightness disproportionation phenomenon.

Please refer to Fig. 7, it illustrates the pel array of watching when from the right of the pel array of Fig. 5.Because the orientation of liquid crystal molecule, the upper area 704 in each

pixel

702 and 706 bright than lower area 708 and 710.Because

zone

704 and 710 is positioned at pixel for the first time, and

zone

706 and 708 is positioned at pixel for the second time, therefore zone 704,710 with regional 706,708 by different driven.Zone 704 has lower threshold voltage, and zone 706 is bright, identical for it, and zone 710 has lower threshold voltage, and zone 708 is bright for it.By this, each pixel comprises four zones with different GTGs.Unshaded zone is the brightest zone, and the zone that illustrates shade with level or perpendicular line is medium bright zone, and the zone that illustrates shade with grid pattern is dark space, and the zone that illustrates shade with oblique line is the zone of medium dark.As shown in Figure 7, the brightest, medium bright, medium dark and the darkest zone are mixed and are formed in the entire pixel array 700.By this, pel array 700 can not produce staggered dark bright band as shown in Figure 4, and then eliminates the brightness disproportionation phenomenon.

Please refer to Fig. 8, it illustrates pel array 800 according to another embodiment of the present invention.Pel array 800 comprises the pixel of a plurality of rectangles, and each pixel is divided into pixel two times.Each pixel further is divided into a plurality of zones, and the liquid crystal molecule in these zones is along different direction orientations.In one embodiment, pixel 802 is divided into the pixel 808,810 and 812 of three parts by slit 814 and 816.Slit 814 extends to a jiao of pixel 802 opposite sides from the mid point of pixel 802 1 sides, and slit 816 extends to another angle of pixel 802 opposite sides from the mid point of pixel 802 1 sides.

Partial pixel

808 and 810 electricity connect, and partial pixel 812 is not connected with

partial pixel

808 and 810 electricity.Therefore,

partial pixel

808 and 810 forms pixel for the first time, and partial pixel 812 forms pixel for the second time.The liquid crystal molecule of partial pixel 808 is along the direction orientation of arrow 818, and the liquid crystal molecule of partial pixel 810 is along the direction orientation of arrow 820.Because due to the geometric figure of

slit

814 and 816, the liquid crystal molecule of the first half of partial pixel 812 is along the direction orientation of arrow 822, the liquid crystal molecule of the Lower Half of partial pixel 812 is along the direction orientation of arrow 824.Ground area definition one zone with identical liquid crystal alignment.As shown in Figure 5, pixel 802 has four zones, and the viewing angle characteristic of pixel 802 can be improved in these zones.Pixel 802 only has two

slits

814 and 816, the known pixel 102 in Fig. 1, and pixel 102 has four protuberances and a slit.Therefore the aperture opening ratio of pixel 802 obviously improves.

Partial pixel

808 and 810 is designed to have lower threshold voltage, and 812 of partial pixels have higher threshold voltage.Being arranged in the pixels all in the pel array 800 of high low threshold voltage part like this repeats.As shown in Figure 8, dash area is represented the high threshold voltage part, and non-shaded portion is represented the low threshold voltage part.Have illustrate dash area with horizontal line pixel by anodal charging, have the pixel that illustrates dash area with perpendicular line and then charge by negative pole.In order to prolong the life-span of pixel, the polarity of charging can change.Because the difference of polarity is utilized the pixel of anodal charging and is utilized the pixel of negative pole charging may have slight different GTG.

The pel array 800 of Fig. 8 is that with pel array 500 differences of Fig. 5 the high threshold voltage part of two adjacent pixels and the arrangement of low threshold voltage part are opposite.When seeing pel array 800 from certain angle, pel array 800 is that similarly each pixel comprises four zones with different GTGs with pel array 500 in abstracto.By this, pel array 800 can not produce staggered dark bright band as shown in Figure 4, and then eliminates the brightness disproportionation phenomenon.

The foregoing description is the example of notion of the present invention as an illustration only, and any embodiment that can not reduce aperture opening ratio about eliminating the brightness disproportionation defective belongs to spirit of the present invention.For example, above-mentioned slit is not limited to straight line, and it can be curve; Perhaps, the position in high threshold voltage and low threshold voltage zone can change.

The method of operating of present embodiment and manufacture method are done detailed explanation at above embodiment.Yet the foregoing description is not with the unique utilization of the present invention, and the foregoing description only is that ad hoc approach of the present invention is implemented in explanation, and it is non-in order to limit the present invention and claim.

Though the present invention is with preferred embodiment explanation as above, so it is not in order to limiting the present invention, those skilled in the art without departing from the spirit and scope of the present invention, when doing to change and retouching.Therefore, protection scope of the present invention is worked as by being as the criterion that claim defined.

Claims

1. LCD, it has pel array, and this pel array comprises:

First pixel of rectangle has for the first time pixel and pixel for the second time, this for the second time pixel in abutting connection with this pixel for the first time, wherein this first time pixel by this second time pixel be divided into first and second part;

Second pixel of rectangle, in abutting connection with a side of this first pixel, this second pixel has pixel and the 4th pixel for the third time, the 4th pixel be in abutting connection with this pixel for the third time, wherein this for the third time pixel be divided into the 3rd and the 4th part by the 4th pixel;

Wherein this first and the 4th pixel is voltage-operated with first threshold, and this second and third time pixel is operated with second threshold voltage that is higher than first threshold voltage, and pixel is charged by anodal for the second time, and the 4th time pixel is then charged by negative pole; And

The arrangement with the inferior pixel of this second threshold voltage part and the operation of this first threshold voltage segment of two adjacent pixels is opposite;

Wherein this first pixel comprises first slit and second slit, this first slit extends to a jiao of opposite side of this first pixel from a mid point of this first pixel, one side, with this first of pixel for the first time with this second time pixel separate, this second slit extends to another angle of this opposite side of this first pixel from this mid point, with this second portion that will be somebody's turn to do pixel for the first time with this second time pixel separate; And

Wherein this second pixel comprises the 3rd slit and the 4th slit, the 3rd slit extends to a jiao of opposite side of this second pixel from a mid point of second pixel, one side, with with this for the third time this third part of pixel separate with the 4th pixel, the 4th slit extends to another angle of this opposite side of this second pixel from this mid point, with this for the third time the 4th part of pixel separate with the 4th pixel.

2. LCD as claimed in claim 1, wherein this first and this second portion electricity connect.

3. LCD as claimed in claim 1 or 2, wherein the 3rd and the 4th part electricity connects.

4. LCD as claimed in claim 1, wherein this first and second slit is a straight line.

5. as claim 1 or 4 described LCD, wherein the 3rd and the 4th slit is a straight line.

6. LCD as claimed in claim 1, wherein this first and second slit is a curve.

7. as claim 1 or 6 described LCD, wherein the 3rd and the 4th slit is a curve.