CN101667381A - Pixel group, flat display panel and driving method for flat display device - Google Patents
Pixel group, flat display panel and driving method for flat display device Download PDFInfo
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- CN101667381A CN101667381A CN 200810214868 CN200810214868A CN101667381A CN 101667381 A CN101667381 A CN 101667381A CN 200810214868 CN200810214868 CN 200810214868 CN 200810214868 A CN200810214868 A CN 200810214868A CN 101667381 A CN101667381 A CN 101667381A
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Abstract
The invention discloses a driving method for a pixel group. The pixel group comprises a plurality of film transistors, and the plurality of film transistors are electrically connected to a first scanline or a second line and a data line. The pixel group is provided with a first display area and a second display area. The first display area is coupled with the data line and the first scan line. The second display area is coupled with the data line, the first scan line and the second scan line. The driving method comprises the following steps that: in a first time interval, providing a first driving signal by the first scan line, providing a second driving signal by the second scan line to conduct the plurality of film transistors, and writing the pixel data into the first display area andthe second display area of the pixel group through the data line; and in the second time interval, providing a third driving signal by the second scan line to conduct the plurality of film transistorselectrically connected to the second scan line so as to redistribute electric charges at two sides of each film transistor.
Description
Technical field
The present invention relates to driving method, particularly be used to drive the driving method of pixel groups, two-d display panel and flat display apparatus.
Background technology
Flat display apparatus (Flat Panel Display, FPD), with respect to traditional cathode-ray tube (CRT) (Cathode Ray Tube, CRT) display device, have slim, in light weight, low in energy consumption, the radiationless pollution of size and can with advantages such as semiconductor fabrication compatibility, be widely used in various electronic products with display screen.Flat display apparatus is according to its structure and principle of work at present, include for example liquid crystal indicator (Liquid Crystal Display, LCD), plasm display device (Plasma Display Panel, PDP), organic LED display device (Organic LightEmitting Diode display, OLED), field emission display device (Field emission display), Surface-conduction Electron-emitter Display device (Surface conduction Electron Emitter Display, SED), the CNT field emission display device (Carbon Nanotube Field Emission Display, CNTFED) etc.
Wherein, with the LCD is example, it utilizes input voltage control liquid crystal molecule to produce different ordered states, makes it control the transmission amount of light to the characteristic that light has different polarizations or refraction effect, and then makes the different image gray of liquid crystal display displays.But because light transmission and input voltage are not to be linear relationship, so in order to make LCD have good display quality, the adjustment of gamma curve (Gamma curve) just seems quite important, and wherein, gamma curve is represented the relation curve of gray scale and transmissivity.
Figure 1 shows that the gamma curve synoptic diagram of the corresponding different visual angles of different primary colors in the available liquid crystal display.General LCD comprises the sub-pixel of redness, green and blue three kinds of primary colors, and all corresponding gamma curve separately of each primary colors.If (being positive visual angle) watches LCD from the visual angle vertical with LCD, its trichromatic gamma curve almost can overlap.Yet if when LCD is watched at the side-looking angle, the gamma curve of each primary colors will produce skew, and side-play amount and inconsistent, makes same gray scale for positive visual angle and the different color of side-looking angle demonstration.For example for the LCD that can show 0 to 255 gray scale, if when all applying the input voltage of 128 gray scales for red, green and blue subpixels, for positive visual angle, will show grey, but for the side-looking angle, because trichromatic gamma curve side-play amount difference will show indigo (Indigo).
The side-play amount of this gamma curve, bigger when middle gray, less in higher or low gray scale hour offset amount.In the LCD of last example, described middle gray for example is 64 to 196 gray scales, and higher gray scale is 197 to 255 gray scales, and low gray scale then is 0 to 63 gray scale.
Therefore, a kind of method that solves the color skew of side-looking role that has proposed, be to use above-mentioned gamma curve when higher and low gray scale, to have the characteristic of less offset amount, a pixel groups is divided into first viewing area and second viewing area, be clear zone and dark space, and in first viewing area, import the voltage of higher gray scale, and the voltage of gray scale is hanged down in input in second viewing area, with the emulation middle gray, make sub-pixel have approximate color for positive visual angle and side-looking angle.
The driving method of traditional intelligence colour cast alignment technique (Low color shift) be the pixel of each row of P-SCAN, and each bar sweep signal does not have overlapping each other.For example, when opening the 2nd sweep trace, data voltage is imported first viewing area and second viewing area of pixel groups simultaneously.After closing the 2nd sweep trace, open the 3rd sweep trace immediately, second viewing area that open pixel groups this moment, the storage capacitors of second viewing area and the electric charge on the building-out capacitor are redistributed, make first viewing area of pixel groups show different gray scales, have approximate color with positive visual angle to reach the side-looking angle with second viewing area.
But, because above-mentioned driving method provides identical sweep signal for each pixel groups, make the gray scale adjustment of second viewing area not have elasticity,, can't make optimized adjustment at each gray scale if expectation is carried out the colour cast compensation at different gray scales.
Therefore, how to provide a kind of driving method that is used to drive pixel groups, two-d display panel and flat display apparatus, make and all can make optimized adjustment for each gray scale, real is one of current important topic.
Summary of the invention
In view of above-mentioned problem, the object of the present invention is to provide and a kind ofly adjust display effect, thereby drive the driving method of pixel groups, two-d display panel and flat display apparatus by circuit.
In order to achieve the above object, according to a kind of driving method of the present invention, be used to drive pixel groups, wherein this pixel groups comprises a plurality of thin film transistor (TFT)s, this thin film transistor (TFT) is electrically connected first sweep trace, second sweep trace and data line, and this pixel groups has first viewing area and second viewing area.First viewing area and data line and first sweep trace couple, and second viewing area and data line, first sweep trace and second sweep trace couple.This driving method may further comprise the steps: first o'clock apart from, first sweep trace provides first drive signal and second sweep trace to provide second drive signal with this thin film transistor (TFT) of conducting, and pixel data is write first viewing area and second viewing area of pixel groups by data line; And second o'clock apart from, second sweep trace provides the 3rd drive signal to be electrically connected on this thin film transistor (TFT) on second sweep trace with conducting, and the electric charge of each thin film transistor (TFT) both sides is redistributed.
In order to achieve the above object, according to a kind of driving method of the present invention, be used to drive two-d display panel, wherein two-d display panel has at least one pixel groups, one first sweep trace, one second sweep trace and a data line, wherein pixel groups comprises a plurality of thin film transistor (TFT)s, and this thin film transistor (TFT) is electrically connected to first sweep trace, second sweep trace and data line.This pixel groups has first viewing area and second viewing area, and first viewing area and data line and first sweep trace couple, and second viewing area and data line, first sweep trace and second sweep trace couple.This driving method may further comprise the steps: first o'clock apart from, first sweep trace provides first drive signal and second sweep trace to provide second drive signal with this thin film transistor (TFT) of conducting, and pixel data is write first viewing area and second viewing area of pixel groups by data line; And second o'clock apart from, second sweep trace provides the 3rd drive signal to be electrically connected on this thin film transistor (TFT) on second sweep trace with conducting, and the electric charge of each thin film transistor (TFT) both sides is redistributed.
In order to achieve the above object, according to a kind of driving method of the present invention, be used to drive flat display apparatus, wherein flat display apparatus has two-d display panel, and two-d display panel has at least one pixel groups, first sweep trace, second sweep trace and data line, wherein this pixel groups comprises a plurality of thin film transistor (TFT)s, and this thin film transistor (TFT) is electrically connected to first sweep trace, second sweep trace and data line.This pixel groups has first viewing area and second viewing area, and first viewing area and data line and first sweep trace couple, and second viewing area and data line, first sweep trace and second sweep trace couple.This driving method may further comprise the steps: first o'clock apart from, first sweep trace provides first drive signal and second sweep trace to provide second drive signal with this thin film transistor (TFT) of conducting, and pixel data is write first viewing area and second viewing area of pixel groups by data line; And second o'clock apart from, second sweep trace provides the 3rd drive signal to be electrically connected on these a plurality of thin film transistor (TFT)s on second sweep trace with conducting, and the electric charge of each thin film transistor (TFT) both sides is redistributed.
As mentioned above, according to the driving method that is used to drive pixel groups, two-d display panel and flat display apparatus of the present invention, two sweep traces of conducting simultaneously in the write time of data are to adjust the transmissivity of first viewing area and second viewing area.Compared with prior art, the present invention can not need to increase under the prerequisite of data line, the inconsistent phenomenon of gamma curve in the time of can improving display device and face with side-looking, and can make optimized adjustment at each gray scale, thereby the raising display quality, and can reduce cost and avoid aperture opening ratio to reduce.
Description of drawings
Figure 1 shows that the gamma curve synoptic diagram of the corresponding different visual angles of different primary colors in existing a kind of liquid crystal indicator;
Figure 2 shows that circuit diagram according to the driving method of a kind of pixel groups of the preferred embodiment of the present invention;
Figure 3 shows that process flow diagram according to the driving method of the pixel groups of the preferred embodiment of the present invention;
Fig. 4 is to the synoptic diagram that Figure 6 shows that according to different driving waveform in the pixel groups driving method of the preferred embodiment of the present invention;
Figure 7 shows that according to different pressure reduction in the pixel groups driving method of the preferred embodiment of the present invention the synoptic diagram of corresponding different gamma curve;
Figure 8 shows that the gamma curve synoptic diagram of the corresponding different visual angles of different primary colors in the pixel groups driving method according to the preferred embodiment of the present invention;
Fig. 9 A is depicted as the circuit diagram according to the flat display apparatus driving method of the preferred embodiment of the present invention;
Fig. 9 B is depicted as the gray scale corresponding tables of storing in the storage unit of Fig. 9 A; And
Figure 10 shows that the another kind of structural representation of the Drive and Control Circuit of Fig. 9 A.
Embodiment
Hereinafter with reference to relevant drawings, the driving method of a kind of according to the preferred embodiment of the invention pixel groups, two-d display panel and flat display apparatus is described, wherein components identical will be represented with identical Reference numeral.
At first, with reference to shown in Figure 2, the pixel groups 1 that is used in combination with pixel groups driving method of the present invention has first viewing area 11 and second viewing area 12, wherein, first viewing area 11 couples with the data line S1 and the first sweep trace G1, and second viewing area 12 couples with data line S1, the first sweep trace G1 and the second sweep trace G2.For example be the formed electrical connection of transmission this so-called " coupling " by electric charge.In addition, in the present embodiment, first viewing area 11 and second viewing area 12 promptly can be general alleged clear zone and dark space.
The first film transistor 111 couples with data line S1, the first sweep trace G1 and first pixel capacitance 112 respectively; Second thin film transistor (TFT) 121 couples with data line S1, the first sweep trace G1 and second pixel capacitance 123 respectively; The 3rd thin film transistor (TFT) 122 couples with the second sweep trace G2, second pixel capacitance 123 and distribution electric capacity 124 respectively.
Refer again to shown in Figure 3ly, comprise that according to the driving method of the pixel groups of the preferred embodiment of the present invention step S01 is to step S02.Below explanation is more simultaneously with reference to Fig. 2 and Fig. 3.
Step S01 be first o'clock in T1, provide first drive signal via the first sweep trace G1, and provide second drive signal to be electrically connected on the first film transistor 111 and second thin film transistor (TFT) 121 of the first sweep trace G1 with conducting via the second sweep trace G2.In the present embodiment, export first drive signal to the first sweep trace G1 by at least one scan line drive circuit, and output second drive signal to the second sweep trace G2.After first drive signal and second drive signal export the first sweep trace G1 and the second sweep trace G2 respectively to, pixel data D1 is write first viewing area 11 and second viewing area 12 of pixel groups 1 by data line S1.Wherein, when the first film transistor 111 that is electrically connected on the first sweep trace G1 and 121 conductings of second thin film transistor (TFT), pixel data D
1Form with electric charge writes first pixel capacitance 112 and second pixel capacitance 123 respectively via the first film transistor 111 and second thin film transistor (TFT) 121, at this moment, and represent pixel data D
1First voltage transmission to the first liquid crystal capacitance C1, the first storage capacitors C2, the second liquid crystal capacitance C3 and the second storage capacitors C4.
Step S02 is apart from T at second o'clock
2In, provide the 3rd drive signal to be electrically connected on the 3rd thin film transistor (TFT) 122 of the second sweep trace G2 via the second sweep trace G2 with conducting, the electric charge of the 3rd thin film transistor (TFT) 122 both sides is redistributed.When being electrically connected on the 3rd thin film transistor (TFT) 122 conductings of the second sweep trace G2, because the voltage of the second liquid crystal capacitance C3 and the second storage capacitors C4 is unequal with the voltage that distributes electric capacity 124, so electric charge can be redistributed, make the second liquid crystal capacitance C3, the second storage capacitors C4 and distribute the voltage of electric capacity 124 to be all second voltage.
At last, the voltage of the first liquid crystal capacitance C1 is first voltage, and the voltage of the second liquid crystal capacitance C3 is second voltage.Because the holding time and/or control first voltage of control the 3rd drive signal, may command is charged to the ratio of first voltage that distributes electric capacity 124, therefore can further adjust the pressure differential deltap V of first voltage and second voltage.In addition, the conducting electric current of the 3rd thin film transistor (TFT) 122 can be designed to smaller value, makes above-mentioned control method can be easier to control.
When the glazed area of first viewing area 11 equates with the glazed area of second viewing area 12, adjust pressure differential deltap V and can obtain different side-looking gamma curve, face and the inconsistent phenomenon of the gamma curve of side-looking to improve display device.With reference to shown in Figure 7, for instance, when the voltage of the first liquid crystal capacitance C1 was 7V, (for example: wavelength was 550nm can to obtain corresponding side-looking gamma curve; The phi angle is 60 degree, expression horizontal direction and panel normal direction folder 60 degree; The theta angle is 0 degree, expression vertical direction and panel normal direction folder 0 degree, this is a polar coordinate representation), wherein, pressure differential deltap V is that near the variation of side-looking gamma curve gray-scale value 128 of 1200mV is too violent, be easy to generate the too unexpected situation of change color during side-looking, it is between 650mV and the 850mV that preferable condition falls within pressure differential deltap V approximately.What deserves to be mentioned is, because that the side-looking gamma curve changes in high gray-scale value and low gray-scale value area relative transmittance is very little, so when pixel groups 1 is desired color beyond the display white and the colour of skin, can reduce pressure differential deltap V to increase brightness and contrast.
Fig. 8 shows the gamma curve synoptic diagram of the corresponding different visual angles of different primary colors in the pixel groups of the preferred embodiment of the present invention.As shown in Figure 8, red green blue tricolor to face gamma curve almost overlapping, and compared to Fig. 1, blue side-looking gamma curve turning point (shown in Fig. 1 dashed circle sign) more not obvious (gray-scale value 96～128 and gray-scale value 160～192) is so the side-play amount of the side-looking gamma curve of red green blue tricolor is more approaching.
What deserves to be mentioned is that apart from T at above-mentioned first o'clock
1Remarked pixel data D
1Write the write time of pixel groups 1.In addition, in the present embodiment, as shown in Figure 4, the zero-time of the zero-time of first drive signal and second drive signal can be simultaneously, and it holds time equally, but the amplitude size of first drive signal and second drive signal is unequal.Also can be as Fig. 5 or shown in Figure 6, the zero-time of the zero-time of first drive signal and second drive signal can be different, and it is unequal to hold time, but the amplitude equal and opposite in direction of first drive signal and second drive signal.Below only be illustrative, the zero-time of first drive signal and second drive signal, hold time and the permutation and combination of drive signal size is not limited only to above-mentioned permutation and combination form.
In addition, driving method according to a kind of two-d display panel of the preferred embodiment of the present invention, wherein two-d display panel for example is a display panels, it has at least one pixel groups, first sweep trace, second sweep trace and data line, wherein pixel groups comprises a plurality of thin film transistor (TFT)s, and it is electrically connected first sweep trace, second sweep trace and data line.Pixel groups has first viewing area and second viewing area, and first viewing area and data line and first sweep trace couple, and second viewing area and data line, first sweep trace and second sweep trace couple.Because the driving method of two-d display panel is identical with the driving method of above-mentioned pixel groups, so repeat no more.
Moreover shown in Fig. 9 A, according to a kind of flat display apparatus 2 of the preferred embodiment of the present invention, wherein flat display apparatus 2 for example is a liquid crystal indicator, and it has two-d display panel 3, data drive circuit 4, scan drive circuit 5 and Drive and Control Circuit 6.Wherein the driving method of two-d display panel 3 is identical with the driving method of above-mentioned pixel groups, so repeat no more.
Shown in Fig. 9 A, data drive circuit 4 is electrically connected on two-d display panel 3 respectively with scan drive circuit 5.Drive and Control Circuit 6 is electrically connected on data drive circuit 4 and scan drive circuit 5 respectively, and wherein Drive and Control Circuit 6 has timing control unit 61 (Timing controller), storage unit 62 and adjustment unit 63.Input gray level S
iTransfer to timing control unit 61 and storage unit 62 respectively, wherein timing control unit 61 is according to input gray level S
iCome control data driving circuit 4 and scan drive circuit 5.
As shown in figure 10, it is the another kind of structure of the Drive and Control Circuit of the preferred embodiment of the present invention.Different with Drive and Control Circuit 6 is that the Drive and Control Circuit 6a of flat display apparatus 2a also comprises delay cell 64, detecting unit 65 and control module 66.Detecting unit 65 receives input gray level S
iTo calculate the characteristics of image parameter, control module 66 is according to input gray level S
iThe characteristics of image parameter with output control signal S
C2, adjustment unit 63 is according to control signal S
C2To adjust the waveform of first drive signal and second drive signal.In addition, delay cell 64 is used to make timing control unit 61 and adjustment unit 63 synchro control scan drive circuits 5.
In sum, the driving method of a kind of pixel groups of the present invention, two-d display panel and flat display apparatus, be the thin film transistor (TFT) that conducting simultaneously is electrically connected on two sweep traces in the write time of data, to adjust the transmissivity of first viewing area and second viewing area.Compared with prior art, the present invention utilize type of drive change and can be under the prerequisite that does not increase data line, can improve display device faces and the inconsistent phenomenon of the gamma curve of side-looking, and the driving time that only needs to adjust each sweep trace according to customer demand distributes, can reach corresponding gamma curve demand, to make optimized adjustment, so can reduce cost and avoid aperture opening ratio to reduce, and then promote display quality at each gray scale.
The above only is an illustrative, but not is restrictive.Anyly do not break away from principle of the present invention and category, and, all should be included in the accompanying Claim scope its equivalent modifications of carrying out or change.
Claims (10)
1, a kind of driving method, be used to drive pixel groups, wherein said pixel groups comprises a plurality of thin film transistor (TFT)s, described thin film transistor (TFT) is electrically connected first sweep trace, second sweep trace and data line, described pixel groups has first viewing area and second viewing area, described first viewing area and described data line and described first sweep trace couple, and described second viewing area and described data line, described first sweep trace and described second sweep trace couple, and described driving method may further comprise the steps:
First o'clock apart from, described first sweep trace provides first drive signal and described second sweep trace to provide second drive signal with the described thin film transistor (TFT) of conducting, and pixel data is write described first viewing area and described second viewing area of described pixel groups by described data line; And
Second o'clock apart from, described second sweep trace provides the 3rd drive signal to be electrically connected on described thin film transistor (TFT) on described second sweep trace with conducting, and the electric charge of each described thin film transistor (TFT) both sides is redistributed.
2, driving method according to claim 1, the zero-time of the zero-time of wherein said first drive signal, second drive signal and the zero-time of described the 3rd drive signal are simultaneously or not simultaneously.
3, driving method according to claim 1, wherein said first drive signal, described second drive signal and described the 3rd drive signal equivalence or non-equivalence.
4, driving method according to claim 1, the holding time of the holding time of wherein said first drive signal, described second drive signal equate with holding time of described the 3rd drive signal or are unequal.
5, driving method according to claim 1, wherein said first o'clock apart from the write time that writes described pixel groups for described pixel data.
6, driving method according to claim 1, wherein said first viewing area has the first film transistor and first pixel capacitance, described second viewing area has second thin film transistor (TFT), the 3rd thin film transistor (TFT), second pixel capacitance and distribution electric capacity, described the first film transistor respectively with described data line, described first sweep trace and described first pixel capacitance couple, described second thin film transistor (TFT) respectively with described data line, described first sweep trace and described second pixel capacitance couple, described the 3rd thin film transistor (TFT) respectively with described second sweep trace, described second pixel capacitance and described distribution electric capacity couple.
7, driving method according to claim 6, wherein when described the first film transistor that is electrically connected on described first sweep trace and the described second thin film transistor (TFT) conducting, described pixel data writes described first pixel capacitance and described second pixel capacitance respectively via described the first film transistor and described second thin film transistor (TFT).
8, driving method according to claim 7, wherein when being electrically connected on described the 3rd thin film transistor (TFT) conducting of described second sweep trace, the pixel data that is stored in described second pixel capacitance is sent to described distribution electric capacity gradually via described the 3rd thin film transistor (TFT).
9, driving method according to claim 6, wherein said first pixel capacitance has first liquid crystal capacitance and first storage capacitors, and described second pixel capacitance has second liquid crystal capacitance and second storage capacitors.
10, a kind of driving method, be used to drive two-d display panel, wherein said two-d display panel has at least one pixel groups, one first sweep trace, one second sweep trace and a data line, wherein said pixel groups comprises a plurality of thin film transistor (TFT)s, described thin film transistor (TFT) is electrically connected on first sweep trace, second sweep trace and data line, described pixel groups has first viewing area and second viewing area, described first viewing area and described data line and described first sweep trace couple, described second viewing area and described data line, described first sweep trace and described second sweep trace couple, and described driving method may further comprise the steps:
First o'clock apart from, described first sweep trace provides first drive signal and described second sweep trace to provide second drive signal with the described thin film transistor (TFT) of conducting, and pixel data is write described first viewing area and described second viewing area of described pixel groups by described data line; And
Second o'clock apart from, described second sweep trace provides the 3rd drive signal to be electrically connected on described thin film transistor (TFT) on described second sweep trace with conducting, and the electric charge of each described thin film transistor (TFT) both sides is redistributed.
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| CN101364401A (en) * | 2007-08-07 | 2009-02-11 | 奇美电子股份有限公司 | Color management system and driving method thereof |
| CN103578444A (en) * | 2013-08-06 | 2014-02-12 | 友达光电股份有限公司 | Pixel driving method and liquid crystal pixel matrix |
| CN103810949A (en) * | 2012-11-06 | 2014-05-21 | 群康科技(深圳)有限公司 | Display device |
| CN105304007A (en) * | 2015-09-17 | 2016-02-03 | 友达光电股份有限公司 | Driving method of display panel |
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| JP4571845B2 (en) * | 2004-11-08 | 2010-10-27 | シャープ株式会社 | Substrate for liquid crystal display device, liquid crystal display device including the same, and driving method thereof |
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| CN101364401B (en) * | 2007-08-07 | 2014-01-22 | 群创光电股份有限公司 | Color management system and driving method thereof |
| CN101364401A (en) * | 2007-08-07 | 2009-02-11 | 奇美电子股份有限公司 | Color management system and driving method thereof |
| CN103810949A (en) * | 2012-11-06 | 2014-05-21 | 群康科技(深圳)有限公司 | Display device |
| CN103578444A (en) * | 2013-08-06 | 2014-02-12 | 友达光电股份有限公司 | Pixel driving method and liquid crystal pixel matrix |
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| CN111684515B (en) * | 2018-02-09 | 2023-01-24 | 株式会社半导体能源研究所 | Driving method of display device |
| CN111684515A (en) * | 2018-02-09 | 2020-09-18 | 株式会社半导体能源研究所 | Driving method of display device |
| CN109742108A (en) * | 2019-01-03 | 2019-05-10 | 京东方科技集团股份有限公司 | A kind of display panel and preparation method thereof, display device |
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| CN113219745A (en) * | 2021-04-20 | 2021-08-06 | 北海惠科光电技术有限公司 | Display panel, display device, and driving method of display panel |
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