CN100445819C - Low color cast liquid crystal display and its driving method - Google Patents
Low color cast liquid crystal display and its driving method Download PDFInfo
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- CN100445819C CN100445819C CNB2006100714308A CN200610071430A CN100445819C CN 100445819 C CN100445819 C CN 100445819C CN B2006100714308 A CNB2006100714308 A CN B2006100714308A CN 200610071430 A CN200610071430 A CN 200610071430A CN 100445819 C CN100445819 C CN 100445819C
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- 238000000034 method Methods 0.000 title claims description 14
- 239000004973 liquid crystal related substance Substances 0.000 title abstract description 14
- 239000003086 colorant Substances 0.000 abstract 1
- 239000010409 thin film Substances 0.000 description 13
- 230000000007 visual effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 4
- 238000013507 mapping Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 208000004350 Strabismus Diseases 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The present invention relates to a liquid crystal display (LED) which comprises a plurality of scanning lines, a plurality of data lines, pixels, a first switch circuit and a second switch circuit, wherein the scanning lines comprise the Nth scanning line and the (N+1)th scanning line, and the N is a positive integer. The pixel comprises a first sub-pixel and a second sub-pixel, the first switch circuit is coupled with the Nth scanning line and the (N+1)th scanning line and is used for controlling the second sub-pixel, and the second switch circuit is coupled with the Nth scanning line and is used for controlling the first sub-pixel, wherein the pixel is used for displaying red, green, blue and white or one of the four colors.
Description
Technical field
The invention relates to a kind of Liquid Crystal Display And Method For Driving, and particularly relevant for a kind of Liquid Crystal Display And Method For Driving of low colour cast.
Background technology
Along with the demonstration trend of slimming, LCD is used in the application of various electronic products such as mobile phone, notebook computer, and colour television set etc. at present widely.Yet, traditional colour liquid crystal display device is because a pixel only is provided a driving voltage in the picture frame time (Frame Period), make corresponding liquid crystal present the inclination of special angle, thereby cause the skew that produces color along with the change at observer visual angle.Fig. 1 represents the equivalent electrical circuit of known pixels, and this pixel is the staggered place that is arranged at M bar data line and N bar sweep trace, and this equivalent circuit then comprises thin film transistor (TFT) T
11, liquid crystal capacitance C
LC, and storage capacitors C
STAs shown in Figure 1, this pixel is by thin film transistor (TFT) T
11Control, make this pixel only be provided a driving voltage in the time in a picture frame.
Fig. 2 represents the mapping of the penetrance (Transmittance) of known LCD under different visual angles (θ) to driving voltage.Fig. 3 represents the mapping of the penetrance of known LCD under different visual angles (θ) to GTG (Gray Level).By Fig. 2 and Fig. 3 as can be known, under identical driving voltage or identical GTG, different visual angles will cause different penetrances, thereby colour cast can occur during display frame.Therefore, how improving color offset phenomenon, to promote the picture quality of LCD, is one of problem of endeavouring of industry.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of Liquid Crystal Display And Method For Driving that improves colour cast is being provided, and can reduce color offset phenomenon effectively to promote the picture quality of display.
According to purpose of the present invention, a kind of LCD is proposed, this LCD comprises multi-strip scanning line, many data lines, pixel, first on-off circuit and second switch circuit.This multi-strip scanning line comprises N bar sweep trace and N+1 bar sweep trace, and N is a positive integer.Pixel comprises first sub-pixel and second sub-pixel.First on-off circuit is to couple so far N bar sweep trace and this N+1 bar sweep trace, and this first on-off circuit is in order to control this second sub-pixel.The second switch circuit is to couple N bar sweep trace so far, and this second switch circuit is in order to control this first sub-pixel.Wherein this pixel is in order to show red, green, blue or wherein of the same colour in vain, wherein this first on-off circuit comprises: the first transistor, comprise first grid, first source electrode and first drain electrode, this first grid is by this N bar sweep trace control, and this first source electrode is to be coupled to this M bar data line; And transistor seconds, comprise second grid, second source electrode and second drain electrode, this second grid is by this N+1 bar sweep trace control, and this second source electrode and this first drain electrode couple, and this second drain electrode is to be coupled to this second sub-pixel, when this first transistor and the conducting simultaneously of this transistor seconds, a sub-pixel voltage that is transmitted by this M bar data line is to export this second sub-pixel to via this first transistor and this transistor seconds.
According to purpose of the present invention, a kind of method that drives LCD is also proposed, this LCD comprises many data lines, multi-strip scanning line and pixel, those sweep traces comprise N bar sweep trace and N+1 bar sweep trace, N is a positive integer, those data lines comprise M bar data line, M is a positive integer, this pixel comprises first sub-pixel and second sub-pixel, this first sub-pixel and this second sub-pixel are arranged between this N bar sweep trace and this N+1 bar sweep trace, and this first sub-pixel and this second sub-pixel are arranged at the same side of this M bar data line, this method comprises the following steps: to produce first pulse signal and second pulse signal in the time in this first sweep trace at a picture frame, and this second pulse signal has a duration; Produce the 3rd pulse signal and the 4th pulse signal in time in this second sweep trace at this picture frame; In this duration, when this second pulse signal and the 3rd pulse signal overlap, the second sub-pixel voltage of this M bar data line is sent to this second sub-pixel; In this duration, when this second pulse signal and the 3rd pulse signal do not overlap, the first sub-pixel voltage of this M bar data line is sent to this first sub-pixel.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 illustrates the equivalent circuit diagram into known pixels.
Fig. 2 illustrates and is the mapping of the penetrance of known LCD under different visual angles to driving voltage.
Fig. 3 illustrates and is the mapping of the GTG of known LCD under different visual angles to driving voltage.
Fig. 4 illustrates the equivalent circuit diagram according to the pixel of the LCD of a preferred embodiment of the present invention.
Fig. 5 illustrates the driving method of pixel of the LCD of preferred embodiment of the present invention.
Fig. 6 A illustrates first kind of circuit block diagram for the data line that drives preferred embodiment of the present invention.
Fig. 6 B illustrates second kind of circuit block diagram for the data line that drives preferred embodiment of the present invention.
Fig. 7 A～7D illustrates first sub-pixel of preferred embodiment of the present invention and the layout configurations figure of second sub-pixel.
[main element label declaration]
P: pixel
SP1: first sub-pixel
SP2: second sub-pixel
S1: first on-off circuit
S2: second switch circuit
C
LC, C
LC1, C
LC2: liquid crystal capacitance
C
ST, C
ST1, C
ST2: storage capacitors
T
11, T
41, T
42, T
43: thin film transistor (TFT)
600: the first value of looking into tables
610: the second value of looking into tables
640: the first gamma circuit
650: the second gamma circuit
630,650: data driver
Embodiment
Please refer to Fig. 4, it illustrates the equivalent circuit diagram according to the pixel of the LCD of a preferred embodiment of the present invention.Pixel P is the staggered place that is arranged at M bar data line and N bar sweep trace, and pixel P comprises the first sub-pixel SP1 and the second sub-pixel SP2, the first on-off circuit S1, reaches second switch circuit S2.The first sub-pixel SP1 is by liquid crystal capacitance C
LC1And storage capacitors C
ST1Equivalence, the second sub-pixel SP2 is then by liquid crystal capacitance C
LC2And storage capacitors C
ST2Equivalence.
The first on-off circuit S1 comprises thin film transistor (TFT) T
42And thin film transistor (TFT) T
43, second switch circuit S2 then comprises thin film transistor (TFT) T
41Thin film transistor (TFT) T
41Comprise first grid, first source electrode and first drain electrode.First grid is that first source electrode is to be coupled to M bar data line by the control of N bar sweep trace, and first drain electrode is to be coupled to the first sub-pixel SP1.Thin film transistor (TFT) T
42Comprise second grid, second source electrode and second drain electrode.Second grid is to be to be coupled to M bar data line by the N bar sweep trace control and second source electrode.Thin film transistor (TFT) T
43Comprise the 3rd grid, the 3rd source electrode and the 3rd drain electrode.The 3rd grid is by the control of N+1 bar sweep trace, and the 3rd source electrode is to be coupled to second drain electrode, and the 3rd drain electrode is to be coupled to the second sub-pixel SP2.
Therefore, as thin film transistor (TFT) T
42And thin film transistor (TFT) T
43During conducting simultaneously, transmit sub-pixel voltage V1 to the first sub-pixel SP2 by M bar data line.And as thin film transistor (TFT) T
41Conducting and thin film transistor (TFT) T
43During not conducting, transmit sub-pixel voltage V2 to the first sub-pixel SP1 by this M bar data line.
Please be simultaneously with reference to Fig. 4 and Fig. 5, it is driving method according to the pixel of the LCD of a preferred embodiment of the present invention that Fig. 5 illustrates.As shown in Figure 5, the voltage level of N bar sweep trace has duration b and the duration d that is maintained at high level in a picture frame in the time, and duration d comprises time d1 and time d2, the voltage level of N+1 bar sweep trace in time d1 for then being low level in the high level time d2.Therefore, sub-pixel voltage V1 is provided to the first sub-pixel SP1 and the second sub-pixel SP2 respectively in time d1, and sub-pixel voltage V2 only is provided to the first sub-pixel SP1 in time d2, this moment, the first sub-pixel SP1 quilt pixel voltage V2 drove and the second sub-pixel SP2 quilt pixel voltage V1 drives, and the total charging time that makes the sub-pixel SP1 that wins is d1+d2 and the total charging time of the second sub-pixel SP2 has only d1.
Since the viewing angle characteristic of pixel P be the first sub-pixel SP1 and the second sub-pixel SP2 viewing angle characteristic add up and average.The arrangement of the liquid crystal molecule by suitably designing the first sub-pixel SP1 and the second sub-pixel SP2 can make its viewing angle characteristic remedy mutually, therefore can decrease in the colour casts that different observations visual angle is caused down.In addition, the data line of present embodiment is with counter-rotating (Dot Inversion) mode activated.Yet for example picture frame counter-rotating (Frame Inversion) of other pattern, row counter-rotatings (Row Inversion) and row counter-rotating (Column Inversion) are also applicable to present embodiment.
Please refer to Fig. 6 A, it illustrates the part calcspar into first kind of driving circuit of driving data lines in the present embodiment.As shown in Figure 6A, its circuit block diagram comprises first value of the looking into table 600, second value of the looking into table 610 and data driver 620.First value of the looking into table 600 is in order to export in order to control the first sub-pixel data value D61 of the first sub-pixel SP1 according to raw pixel data D60, second value of the looking into table 610 in order to according to raw pixel data D60 output in order to controlling the second sub-pixel data value D62 of the second sub-pixel SP2, and data driver 620 is in order to export sub-pixel voltage V1 and sub-pixel voltage V2 to the M bar data line that corresponds to the first sub-pixel SP1 and the second sub-pixel SP2 respectively according to the first sub-pixel data value D61 and the second sub-pixel data value D62.Control sub-pixel voltage V1 and sub-pixel voltage V2 respectively by the first different value of the looking into tables 600 and second value of the looking into table 610, make pixel P inside that two groups of voltages be arranged, therefore can do optimized design and reach best display effect each GTG.
When choosing corresponding sub-pixel voltage V1 and sub-pixel voltage V2 at each GTG, present embodiment is to draw optimized viewing angle characteristic to each GTG by trial and error (Trial-and-error Method).Moreover, for example also can design sub-pixel voltage V1 under the situation of bright attitude at some GTG and equal sub-pixel voltage V2, so can avoid the loss of penetrance.
Please refer to Fig. 6 B, it illustrates second kind of circuit block diagram into driving data lines in the present embodiment.Shown in Fig. 6 B, its circuit block diagram comprises first gamma circuit 630, second gamma circuit 640 and data driver 650.First gamma circuit 630 corresponds to first group of gamma electric voltage V63 of the first sub-pixel SP1 in order to generation, second gamma circuit 640 corresponds to second group of gamma electric voltage V64 of the second sub-pixel SP2 in order to generation, and data driver 650 is in order to export sub-pixel voltage V1 and sub-pixel voltage V2 to the M bar data line that corresponds to the first sub-pixel SP1 and the second sub-pixel SP2 respectively according to first group of gamma electric voltage V63 and second group of gamma electric voltage V64.Similarly, also can reach the above-mentioned effect of utilizing the first different value of the looking into tables 600 and second value of the looking into table 610 to be reached, just repeat no more in this by the first different gamma circuit 630 and second gamma circuit 640.
Please be simultaneously with reference to Fig. 7 A～7D, it illustrates the various layout configurations figure into the first sub-pixel SP1 in the present embodiment and the second sub-pixel SP2.Arrangement mode shown in Fig. 7 A is configuration up and down, and the arrangement mode shown in Fig. 7 B disposes about being, the arrangement mode shown in Fig. 7 C is interconnected, and the arrangement mode shown in Fig. 7 D is to dispose about triangle.In addition, because the total charging time of the second sub-pixel SP2 is less than the total charging time of the first sub-pixel SP1 in the present embodiment, thereby the layout area that disposes the first sub-pixel SP1 greater than the layout area of the second sub-pixel SP2 avoiding the duration of charging deficiency of the second sub-pixel SP2, its first sub-pixel SP1 is about 9: 1 with the preferable layout area ratio of the second sub-pixel SP2～5: 5.
Present embodiment becomes first sub-pixel and second sub-pixel with a pixel segmentation, by different type of drive two sub-pixels of this pixel are driven respectively by two kinds of different voltages, cause two kinds of different liquid crystal angles of inclination, the optical effect of the display field of two sub-pixel is compensated mutually.With many display fields vertical orientation type (Multi-Domain Vertical Alignment) LCD is example, four known display fields can be become eight display fields, in order to compensate the luminance difference that is caused under positive visual angle and angle of squint observation situation, its view effect will more be better than the LCD of four display fields of known use.With Transflective (Transflective) LCD is example, the pixel of echo area and penetrating region can be driven by two kinds of different voltages respectively, makes the optical effect of echo area and penetrating region reach coupling.If with stable twisted nematic (Twisted Nematic) LCD is example, also can reduce the colour cast that is caused because of the visual angle difference by the number that increases the zone.
In sum; though the present invention discloses as above with a preferred embodiment; right its 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 can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (8)
1. LCD comprises:
The multi-strip scanning line comprises N bar sweep trace and N+1 bar sweep trace, and wherein N is a positive integer;
Many data lines comprise M bar data line, and wherein M is a positive integer;
Pixel comprises first sub-pixel and second sub-pixel, and this first sub-pixel and this second sub-pixel all are arranged between this N bar sweep trace and this N+1 bar sweep trace, and this first sub-pixel and this second sub-pixel are arranged at the same side of this M bar data line;
First on-off circuit is to be coupled to this N bar sweep trace and this N+1 bar sweep trace, and this first on-off circuit is in order to control this second sub-pixel; And
The second switch circuit is to be coupled to this N bar sweep trace, and this second switch circuit is in order to control this first sub-pixel;
Wherein this pixel is in order to showing red, green, blue or wherein of the same colour in vain,
Wherein this first on-off circuit comprises:
The first transistor comprises first grid, first source electrode and first drain electrode, and this first grid is by this N bar sweep trace control, and this first source electrode is to be coupled to this M bar data line; And
Transistor seconds, comprise second grid, second source electrode and second drain electrode, this second grid is by this N+1 bar sweep trace control, and this second source electrode and this first drain electrode couple, and this second drain electrode is to be coupled to this second sub-pixel, when this first transistor and the conducting simultaneously of this transistor seconds, a sub-pixel voltage that is transmitted by this M bar data line is to export this second sub-pixel to via this first transistor and this transistor seconds.
2. LCD according to claim 1, wherein this first sub-pixel be about 9: 1 with the layout area ratio of this second sub-pixel～1: 1.
3. LCD according to claim 1, wherein the layout area of this first sub-pixel is greater than the layout area of this second sub-pixel.
4. LCD according to claim 1 also comprises:
First value of the looking into table is in order to export in order to control the first sub-pixel data value of this first sub-pixel according to raw pixel data;
Second value of the looking into table is in order to export in order to control the second sub-pixel data value of this second sub-pixel according to this raw pixel data; And
Data driver is to couple with those data lines, in order to according to this first sub-pixel data value and this second sub-pixel data value, exports the first sub-pixel voltage and the second sub-pixel voltage that corresponds to this first sub-pixel and this second sub-pixel respectively.
5. LCD according to claim 1 also comprises:
First gamma circuit corresponds to first group of gamma electric voltage of this first sub-pixel in order to generation;
Second gamma circuit corresponds to second group of gamma electric voltage of this second sub-pixel in order to generation; And
Data driver is to couple with those data lines, in order to according to this first group of gamma electric voltage and second group of gamma electric voltage, exports the first sub-pixel voltage and the second sub-pixel voltage that corresponds to this first sub-pixel and this second sub-pixel respectively.
6. method that drives LCD, this LCD comprises many data lines, multi-strip scanning line and pixel, those sweep traces comprise N bar sweep trace and N+1 bar sweep trace, N is a positive integer, those data lines comprise M bar data line, M is a positive integer, this pixel comprises first sub-pixel and second sub-pixel, this first sub-pixel and this second sub-pixel are arranged between this N bar sweep trace and this N+1 bar sweep trace, and this first sub-pixel and this second sub-pixel are arranged at the same side of this M bar data line, and this method comprises the following steps:
Produce first pulse signal and second pulse signal in time in this first sweep trace at a picture frame, this second pulse signal has a duration;
Produce the 3rd pulse signal and the 4th pulse signal in time in this second sweep trace at this picture frame;
In this duration, when this second pulse signal and the 3rd pulse signal overlap, the second sub-pixel voltage of this M bar data line is sent to this second sub-pixel;
In this duration, when this second pulse signal and the 3rd pulse signal do not overlap, the first sub-pixel voltage of this M bar data line is sent to this first sub-pixel.
7. method according to claim 6 wherein also comprises the following steps:
Produce first value of the looking into table, in order to export in order to control the first sub-pixel data value of this first sub-pixel according to raw pixel data;
Produce second value of the looking into table, in order to export in order to control the second sub-pixel data value of this second sub-pixel according to this raw pixel data; And
The configuration data driver, this data driver is to couple with those data lines, in order to according to this first sub-pixel data value and this second sub-pixel data value, export the first sub-pixel voltage and the second sub-pixel voltage that corresponds to this first sub-pixel and this second sub-pixel respectively.
8. method according to claim 6 wherein also comprises the following steps:
Generation corresponds to first group of gamma electric voltage of this first sub-pixel;
Generation corresponds to second group of gamma electric voltage of this second sub-pixel; And
The configuration data driver, this data driver is to couple with those data lines, in order to according to this first group of gamma electric voltage and second group of gamma electric voltage, export the first sub-pixel voltage and the second sub-pixel voltage that corresponds to this first sub-pixel and this second sub-pixel respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100714308A CN100445819C (en) | 2006-03-28 | 2006-03-28 | Low color cast liquid crystal display and its driving method |
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|---|---|---|---|
| CNB2006100714308A CN100445819C (en) | 2006-03-28 | 2006-03-28 | Low color cast liquid crystal display and its driving method |
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| CN1821842A CN1821842A (en) | 2006-08-23 |
| CN100445819C true CN100445819C (en) | 2008-12-24 |
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| US20210398469A1 (en) * | 2020-06-19 | 2021-12-23 | Innolux Corporation | Method for charging and display device |
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| TWI336804B (en) | 2006-08-25 | 2011-02-01 | Au Optronics Corp | Liquid crystal display and operation method thereof |
| TWI321771B (en) | 2006-09-08 | 2010-03-11 | Au Optronics Corp | Liquid crystal display and driving method thereof |
| CN100462829C (en) * | 2007-02-14 | 2009-02-18 | 友达光电股份有限公司 | Pixel structure and method for producing driving voltage in the pixel structure |
| CN101599253B (en) * | 2009-03-30 | 2012-08-22 | 南京中电熊猫液晶显示科技有限公司 | Driving method of liquid crystal display |
| CN101866087B (en) * | 2009-04-14 | 2012-03-21 | 群康科技(深圳)有限公司 | Sub-pixel structure and liquid crystal display panel |
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| CN104536224B (en) | 2014-12-31 | 2017-10-13 | 深圳市华星光电技术有限公司 | Thin-film transistor array base-plate and display panel |
| CN104834116B (en) * | 2015-05-26 | 2019-01-25 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display panel and its driving method |
| CN104900205B (en) * | 2015-06-12 | 2017-04-26 | 深圳市华星光电技术有限公司 | Liquid-crystal panel and drive method therefor |
| CN106023928B (en) * | 2016-07-19 | 2019-04-30 | 深圳市华星光电技术有限公司 | Source drive module and liquid crystal display device |
| CN109036278B (en) * | 2018-10-10 | 2020-05-19 | 深圳市华星光电技术有限公司 | OLED display and driving method thereof |
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| CN1821842A (en) | 2006-08-23 |
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