CN102063875A - Color sequential liquid crystal display and related drive method - Google Patents
Color sequential liquid crystal display and related drive method Download PDFInfo
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- CN102063875A CN102063875A CN2009102234737A CN200910223473A CN102063875A CN 102063875 A CN102063875 A CN 102063875A CN 2009102234737 A CN2009102234737 A CN 2009102234737A CN 200910223473 A CN200910223473 A CN 200910223473A CN 102063875 A CN102063875 A CN 102063875A
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Abstract
The invention discloses a drive method for a color sequential liquid crystal display. The drive method comprises the following steps of: providing a vertical synchronizing signal to define an initial point of a driving period, providing a picture field synchronizing signal to define a plurality of picture fields contained in the driving period, and providing a plurality of groups of gamma voltages for the picture fields in the driving period; and outputting a plurality of control signals according to the vertical synchronizing signal and the picture field synchronizing signal, and outputting a corresponding gamma voltage in the plurality of groups of gamma voltages in a specific picture field according to the plurality of control signals.
Description
Technical field
The present invention is relevant to a kind of LCD, refers to a kind of color sequential liquid crystal display that improves color distortion especially.
Background technology
LCD (liquid crystal display, LCD) have low radiation, volume is little and advantage such as low power consuming, replace traditional cathode-ray tube (CRT) (cathode raytube gradually, CRT) display, and then be widely used in mobile computer, personal digital assistant (personal digital assistant, PDA), flat-surface television, or on the information products such as mobile phone.LCD is generally used colored filter (color filter) panel or look preface method (color sequential method) panel.The colored filter LCD is utilized the effect of perception colour mixture among the human visual system, utilizes space mixed light mode to come show image.With Thin Film Transistor-LCD (thin film transistor liquidcrystal display, TFT-LCD) be example, each display pixel constitutes by three sub-pixels of the red, green, blue that is distributed on the colored filter (RGB), and each sub-pixel that utilizes white light source to penetrate to have specific grey-scale is to show particular color, these sub-pixels are less than the distinguishable angular field of view of human eye, when two kinds of illumination more than the color during, just can on retina, mix and obtain single full-color picture to naked eyes.
The same pixel that color sequential liquid crystal display uses the light source of three kinds of colors of red, green, blue to penetrate in the different time to have specific grey-scale respectively is to show different particular colors, the figure field (for example adhering to the difference figure field of red green blue tricolor separately) of different colour systems must be exported with timesharing and according to the mode of particular order, and then the persistence of vision phenomenon of utilizing human eye reaches the purpose that shows full-color picture, that is carries out colour mixture in time.Color sequential liquid crystal display need not use colored filter, therefore can reduce cost, reduce volume, and promotes the light penetration (transmittance) of panel.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of a color sequential liquid crystal display 100 in the prior art.Color sequential liquid crystal display 100 comprises a display panels 110, one source pole driving circuit 120, a gate driver circuit 130, time schedule controller 140, and a gal sign indicating number output circuit 150.Time schedule controller 140 can produce raw video data-signal DATA and initial pulse signal VST.The gal sign indicating number voltage γ of gal sign indicating number output circuit 150 exportable fixed values is to source electrode drive circuit 120.Therefore, gate driver circuit 130 can be opened pixel on the display panels 110 according to initial pulse signal VST, and source electrode drive circuit 120 can write pixel on the display panels 110 with data according to raw video data-signal DATA and gal sign indicating number voltage γ.Yet, the color sequential liquid crystal display 100 of prior art uses the gal sign indicating number voltage γ of fixed value simultaneously red green blue tricolor to be proofreaied and correct so that the image of different tones to be provided, because each coloured light is relevant to mesomorphic state by the energy of panel, the brightness sum total of red bluish-green three coloured light might not equate with the brightness of white light, therefore can cause cross-color.
Please refer to Fig. 2, Fig. 2 has shown the relation of light penetration and pixel gray level value for the white image of preface method panel of the same colour adds blue gal sign indicating number figure (Gamma chart) with the red green that adds.In Fig. 2, the brightness value of curve W representative color preface method panel light when the display white image, and the brightness additive value of curve W ' representative color preface method panel light when showing red, green, blue three look images.As shown in Figure 2, when pixel gray level value is big more, the difference between curve W and the curve W ' is big more.For instance, when pixel gray level value is 255, when the red, green, blue brightness addition of look preface method panel only is about the display white image 63% of brightness, so can influence display quality.
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the XYZ chromaticity diagram of colored filter panel, and Fig. 4 is the XYZ chromaticity diagram of look preface method panel.XYZ chromaticity diagram is that (the color coordinate system that Commission Internationale de l ' clairage) is formulated represents redness, green and blue ray shared ratio in certain color of pixel by trichromatic coefficient (trichromatic coefficient) ER, EG and EB in international lighting association.The sum total of ER, EG and EB is 1, and as transverse axis, EG is the longitudinal axis to XYZ chromaticity diagram with ER, can represent the formed color space of red green blue tricolor.In XYZ chromaticity diagram, what be positioned at three summits is the Red Green Blue of chroma maximum, and central part is the white of chroma minimum.Generally when image processing, can use a specific gal sign indicating number voltage simultaneously red green blue tricolor to be proofreaied and correct, and then the image of different tones is provided.In Fig. 3 and Fig. 4, curve C, M and Y represent the color mixture curve of cyan (bluish-green colour mixture), carmetta (red blue colour mixture) and the yellow (red green colour mixture) of colored filter panel respectively, and cyan, carmetta and the yellow color mixture curve of C ', M ' and Y ' difference representative color preface method panel.As shown in Figure 3, the gray-scale distribution of color mixture curve C, M and Y is linear in the colored filter panel, and color mixture curve C ', M ' and Y ' present nonlinear Distribution at each GTG in the look preface method panel, therefore can cause cross-color.
Summary of the invention
The invention provides a kind of color sequential liquid crystal display, it comprises time schedule controller, be used to provide a vertical synchronizing signal and a figure field sync signal, wherein this vertical synchronizing signal is used for defining the starting point of the drive cycle of this color sequential liquid crystal display, and this figure field sync signal is used for defining a plurality of figure field that is comprised in the drive cycle of this color sequential liquid crystal display; One gal sign indicating number selected cell, it exports the complex control signal according to this vertical synchronizing signal and this figure field sync signal; One adjustable gal sign indicating number output circuit has plural groups gal sign indicating number voltage in it, be used for exporting a corresponding gal sign indicating number voltage in this plural groups gal sign indicating number voltage according to this complex control signal in a specific pattern field; And the one source pole driving circuit, be used for coming the image output data-signal according to this gal sign indicating number voltage that this adjustable gal sign indicating number output circuit transmits.
The present invention also provides a kind of driving method of color sequential liquid crystal display, and it comprises the starting point that the drive cycle of a vertical synchronizing signal to define this color sequential liquid crystal display is provided; Provide a figure field sync signal to define a plurality of figure field that drive cycle was comprised of this color sequential liquid crystal display; Plural groups gal sign indicating number voltage is provided; Export the complex control signal according to this vertical synchronizing signal and this figure field sync signal; And in a specific pattern field, export a corresponding gal sign indicating number voltage in this plural groups gal sign indicating number voltage according to this complex control signal.
Description of drawings
Fig. 1 is the synoptic diagram of a color sequential liquid crystal display in the prior art.
Fig. 2 adds blue gal sign indicating number figure for the white image of preface method panel of the same colour with the red green that adds.
Fig. 3 is the XYZ chromaticity diagram of colored filter panel.
Fig. 4 is the XYZ chromaticity diagram of look preface method panel.
Fig. 5 is the synoptic diagram of a color sequential liquid crystal display among the present invention.
Fig. 6 and Fig. 7 are the sequential chart of the driving method of color sequential liquid crystal display in the embodiment of the invention.
Embodiment
In the middle of instructions and aforesaid claim scope, used some vocabulary to censure specific element.The person with usual knowledge in their respective areas should understand, and same element may be called with different nouns by manufacturer.This instructions and aforesaid claim scope are not used as the mode of distinct elements with the difference of title, but the benchmark that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of instructions and the aforesaid claim in the whole text, so should be construed to " comprise but be not limited to ".
Please refer to Fig. 5, Fig. 5 is the synoptic diagram of a color sequential liquid crystal display 200 among the present invention.Color sequential liquid crystal display 200 comprises a display panels 210, one source pole driving circuit 220, a gate driver circuit 230, time schedule controller 240, an adjustable gal sign indicating number output circuit 250, and a gal sign indicating number selected cell 260.Display panels 210 is provided with a plurality of pixels.Time schedule controller 240 can produce raw video data-signal DATA, initial pulse signal VST, vertical synchronization (vertical synchronization) signal Vsync, figure field synchronization (field synchronization) signal Fsync, and mode select signal MS etc.Vertical synchronizing signal Vsync is used for defining the starting point of the drive cycle of color sequential liquid crystal display 200, figure field sync signal Fsync is used for defining a plurality of figure field that is comprised in the drive cycle of color sequential liquid crystal display 200, and mode select signal MS is used for selecting a plurality of drive patterns one of them (if color sequential liquid crystal display 200 only provides single drive pattern, then need not use mode select signal MS) of color sequential liquid crystal display 200.Gal sign indicating number selected cell 260 is exported n control signal P1～Pn to gal sign indicating number output circuit 250 according to vertical synchronizing signal Vsync, figure field sync signal Fsync and mode select signal MS.There is plural groups gal sign indicating number voltage γ 1～γ m in the adjustable gal sign indicating number output circuit 250, can exports corresponding gal sign indicating number voltage to source electrode drive circuit 220 according to the current potential of control signal P1～Pn.Therefore, gate driver circuit 230 can produce the required gate drive signal of on-pixel according to initial pulse signal VST, and the gal sign indicating number voltage that source electrode drive circuit 220 can transmit according to raw video data-signal DATA and adjustable gal sign indicating number output circuit 250 writes pixel on the display panels 210 with data.
Please refer to Fig. 6 and Fig. 7, the sequential chart of Fig. 6 and Fig. 7 has illustrated the driving method of color sequential liquid crystal display 200 in the embodiment of the invention.Suppose that color sequential liquid crystal display 200 provides 8 kinds of drive patterns, the waveform of its corresponding mode select signal is respectively shown in the MS1～MS8 among Fig. 6 and Fig. 7.In first to fourth pattern shown in Figure 6, raw video data-signal DATA is a continuous data, represents red image data by R, and G represents green image data, and B represents blue image data, and K represents the black plug data.The frequency of supposing vertical synchronizing signal Vsync is 60 hertz, and the frequency of figure field sync signal Fsync is 720 hertz, that is comprises 12 figure in the drive cycle.According to mode select signal MS1～MS4, the figure field of different colour systems can be exported with timesharing and mode in regular turn, reach the purpose that shows full-color picture in order to persistence of vision phenomenon with human eye.The action of first drive pattern, 12 figure fields in each drive cycle is in regular turn: the negative black plug image data of output, the positive red image data of output, output are born red image data, the positive black plug image data of output, the negative green image data of output, the positive green image data of output, export negative black plug image data, the positive blue image data of output, the negative blue image data of output, are exported positive black plug data, the negative green image data of output, and export positive green image data; 12 figure action is in regular turn in the figure field of second drive pattern in the odd number drive cycle: the negative black plug image data of output, the negative red image data of output, the negative red image data of output, the negative black plug image data of output, the negative green image data of output, the negative green image data of output, the negative black plug image data of output, the negative blue image data of output, the negative blue image data of output, the negative black plug data of output, the negative green image data of output, and the negative green image data of output, and 12 figure action is in regular turn in the figure field in the even number drive cycle: export positive black plug image data, export positive red image data, export positive red image data, export positive black plug image data, export positive green image data, export positive green image data, export positive black plug image data, export positive blue image data, export positive blue image data, export positive black plug data, export positive green image data, and export positive green image data; 12 figure the actions in each drive cycle of the 3rd drive pattern are in regular turn: the negative black plug image data of output, the negative red image data of output, the positive red image data of output, the positive black plug image data of output, the positive green image data of output, the negative green image data of output, the negative black plug image data of output, the negative blue image data of output, the positive blue image data of output, the positive black plug data of output, the positive green image data of output, and the negative green image data of output; 12 figure the actions in each drive cycle of 4 wheel driven dynamic model formula are in regular turn: the negative black plug image data of output, the negative red image data of output, the positive red image data of output, the positive black plug image data of output, the positive green image data of output, the positive green image data of output, the positive black plug image data of output, the positive blue image data of output, the negative blue image data of output, the negative black plug data of output, the negative green image data of output, and the negative green image data of output.
In the 5th to the 8th pattern shown in Figure 7, raw video data-signal DATA is a discrete date, represents red image data by R, and G represents green image data, and B represents the figure field of blue image data, and H represents not output data.The frequency of supposing vertical synchronizing signal Vsync is 60 hertz, and the frequency of figure field sync signal Fsync is 480 hertz, that is comprises 8 figure in the drive cycle.According to mode select signal MS5～MS8, the figure field of different colour systems can be exported with timesharing and mode in regular turn, reach the purpose that shows full-color picture in order to persistence of vision phenomenon with human eye.The action of the 5th drive pattern 8 figure fields in each drive cycle is in regular turn: the negative red image data of output, the positive red image data of output, output are born green image data, the positive green image data of output, the negative blue image data of output, the positive blue image data of output, are exported negative green image data, and export positive green image data; The action of the 6th drive pattern 8 figure fields in the odd number drive cycle is in regular turn: the negative red image data of output, the negative red image data of output, the negative green image data of output, the negative green image data of output, the negative blue image data of output, the negative blue image data of output, the negative green image data of output, and the negative green image data of output, and 8 figure action is in regular turn in the figure field in the even number drive cycle: export positive red image data, export positive red image data, export positive green image data, export positive green image data, export positive blue image data, export positive blue image data, export positive green image data, and export positive green image data; 8 actions of scheming the field in each drive cycle of the 7th drive pattern are in regular turn: output is born red image data, the positive red image data of output, exports positive green image data, exports negative green image data, exports negative blue image data, is exported and bear blue image data, the positive green image data of output, and exports positive green image data; 8 actions of scheming the field in each drive cycle of the 8th drive pattern are in regular turn: export and bear red image data, the positive red image data of output, export positive green image data, export positive green image data, export positive blue image data, export negative blue image data, export and bear green image data, and export and bear green image data.
The present invention provides different gal sign indicating number voltages according to drive pattern, at 12 in first to fourth pattern figure, adjustable gal sign indicating number output circuit 250 can built-in 12 groups of gal sign indicating number voltage γ 1～γ 12, and gal sign indicating number selected cell 260 need be exported 4 control signal P1～P4 at least.When vertical synchronizing signal Vsync and figure field sync signal Fsync while tool noble potential, gal sign indicating number selected cell 260 values with the The built-in buffer make zero; When vertical synchronizing signal Vsync tool electronegative potential and during figure field sync signal Fsync tool noble potential, gal sign indicating number selected cell 260 can add one with the value of The built-in buffer.When the accurate position of its logic of control signal of gal sign indicating number selected cell 260 output (P1, P2, P3, when P4) be (0,0,0,0), gal sign indicating number output circuit 250 can be exported gal sign indicating number voltage γ 1; When the accurate position of its logic of control signal of gal sign indicating number selected cell 260 output (P1, P2, P3, when P4) be (0,0,0,1), gal sign indicating number output circuit 250 can be exported gal sign indicating number voltage γ 2; ...; When the accurate position of its logic of control signal of gal sign indicating number selected cell 260 output (P1, P2, P3, when P4) be (1,1,0,0), gal sign indicating number output circuit 250 can be exported gal sign indicating number voltage γ 12.Therefore, all there is corresponding gal sign indicating number voltage each figure field in first to fourth pattern.
At 8 in the 5th to the 8th pattern figure, adjustable gal sign indicating number output circuit 250 can built-in 8 groups of gal sign indicating number voltage γ 1～γ 8, and gal sign indicating number selected cell 260 need be exported 8 control signal P1～P3 at least.When vertical synchronizing signal Vsync and figure field sync signal Fsync while tool noble potential, gal sign indicating number selected cell 260 values with the The built-in buffer make zero; When vertical synchronizing signal Vsync tool electronegative potential and during figure field sync signal Fsync tool noble potential, gal sign indicating number selected cell 260 can add one with the value of The built-in buffer.(when P1, P2 P3) were (0,0,0), gal sign indicating number output circuit 250 can be exported gal sign indicating number voltage γ 1 when the accurate position of its logic of control signal of gal sign indicating number selected cell 260 outputs; (when P1, P2 P3) were (0,0,1), gal sign indicating number output circuit 250 can be exported gal sign indicating number voltage γ 2 when the accurate position of its logic of control signal of gal sign indicating number selected cell 260 outputs; ...; (when P1, P2 P3) were (1,1,1), gal sign indicating number output circuit 250 can output gal sign indicating number voltage γ 8 when the accurate position of its logic of control signal of gal sign indicating number selected cell 260 outputs.Therefore, all there is corresponding gal sign indicating number voltage each figure field in the 5th to the 8th pattern.
The present invention provides different gal sign indicating number voltages according to drive pattern, make each figure field that corresponding gal sign indicating number voltage all can be arranged, therefore can be respectively red green blue tricolor be carried out in various degree gamma correction, the anglec of rotation of the liquid crystal molecule of transference RGB light correspondence is identical, and then improves the situation of color distortion.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. color sequential liquid crystal display, it comprises:
Time schedule controller, be used to provide a vertical synchronizing signal and a figure field sync signal, wherein this vertical synchronizing signal is used for defining the starting point of the drive cycle of this color sequential liquid crystal display, and this figure field sync signal is used for defining a plurality of figure field that is comprised in the drive cycle of this color sequential liquid crystal display;
One gal sign indicating number selected cell, it exports the complex control signal according to this vertical synchronizing signal and this figure field sync signal;
One adjustable gal sign indicating number output circuit has plural groups gal sign indicating number voltage in it, be used for exporting a corresponding gal sign indicating number voltage in this plural groups gal sign indicating number voltage according to this complex control signal in a specific pattern field; And
The one source pole driving circuit is used for coming the image output data-signal according to this gal sign indicating number voltage that this adjustable gal sign indicating number output circuit transmits.
2. color sequential liquid crystal display as claimed in claim 1 is characterized in that:
This time schedule controller also provide a mode select signal with a plurality of drive patterns of selecting this color sequential liquid crystal display one of them; And
This gal sign indicating number selected cell is also exported this complex control signal according to this mode select signal.
3. color sequential liquid crystal display as claimed in claim 1 is characterized in that, also comprises:
One display panels which is provided with a plurality of pixels, is used for coming show image according to this image data signal that this source electrode drive circuit transmits.
4. color sequential liquid crystal display as claimed in claim 3 is characterized in that, also comprises a gate driver circuit, is used for producing the required gate drive signal of these a plurality of pixels of unlatching.
5. color sequential liquid crystal display as claimed in claim 1, it is characterized in that, this gal sign indicating number selected cell comprises a buffer, this gal sign indicating number selected cell upgrades the value of this buffer according to the current potential of this vertical synchronizing signal and this figure field sync signal, and decides the current potential of this complex control signal according to the value of this buffer.
6. the driving method of a color sequential liquid crystal display is characterized in that, comprises:
The starting point of the drive cycle of one vertical synchronizing signal to define this color sequential liquid crystal display is provided;
Provide a figure field sync signal to define a plurality of figure field that drive cycle was comprised of this color sequential liquid crystal display;
Plural groups gal sign indicating number voltage is provided;
Export the complex control signal according to this vertical synchronizing signal and this figure field sync signal; And
In a specific pattern field, export a corresponding gal sign indicating number voltage in this plural groups gal sign indicating number voltage according to this complex control signal.
7. driving method as claimed in claim 6 is characterized in that, also comprises:
Come the image output data-signal according to this corresponding gal sign indicating number voltage.
8. driving method as claimed in claim 6 is characterized in that, also comprises:
Provide a mode select signal with a plurality of drive patterns of selecting this color sequential liquid crystal display one of them; And
Export this complex control signal according to this vertical synchronizing signal, this figure field sync signal and this mode select signal.
9. driving method as claimed in claim 6 is characterized in that, also comprises:
Provide this plural groups gal sign indicating number voltage at each figure field in the drive cycle of this color sequential liquid crystal display.
10. driving method as claimed in claim 6 is characterized in that, exports the complex control signal according to this vertical synchronizing signal and this figure field sync signal and comprises:
When this vertical synchronizing signal and this figure field sync signal simultaneously during tool one first current potential, the value of a buffer is made zero;
When this vertical synchronizing signal tool one second current potential and this this first current potential of figure field sync signal tool, the value of this buffer is added one; And
Decide the current potential of this complex control signal according to the value of this buffer.
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| CN102244799A (en) * | 2011-06-14 | 2011-11-16 | 华映视讯（吴江）有限公司 | Display system of stereo image |
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| KR20050082643A (en) * | 2004-02-19 | 2005-08-24 | 삼성에스디아이 주식회사 | Driving method of fs-lcd |
| CN101494039B (en) * | 2009-02-27 | 2012-05-30 | 福建华映显示科技有限公司 | Apparatus and method for adjusting white balance of color sequence method display |
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Effective date of registration: 20230619 Address after: No. two, No. 1188 West Ring Road, Shengze Town, Wujiang District, Jiangsu, Suzhou Patentee after: Suzhou Shengze science and Technology Pioneer Park Development Co.,Ltd. Address before: 215217, No. 88, Tung Hing Road, Tongli District, Wujiang Economic Development Zone, Suzhou, Jiangsu Patentee before: CPTW (WUJIANG) Co.,Ltd. Patentee before: Chunghwa Picture Tubes, Ltd. |