CN1866344A - Color sequential liquid crystal display - Google Patents
Color sequential liquid crystal display Download PDFInfo
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- CN1866344A CN1866344A CN 200510073683 CN200510073683A CN1866344A CN 1866344 A CN1866344 A CN 1866344A CN 200510073683 CN200510073683 CN 200510073683 CN 200510073683 A CN200510073683 A CN 200510073683A CN 1866344 A CN1866344 A CN 1866344A
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- liquid crystal
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Abstract
Unlike to traditional method, in this invention, it takes molecular field process for red, green and blue data, and controls simultaneously opposite light source coordinated by a system synchronization clock signal; then, it passes or not different color light by light valve action of liquid crystal element to implement gray or color display. This invention reduces request for response feature of liquid crystal material.
Description
Technical field
The present invention relates to Liquid Crystal Display And Method For Driving, particularly relevant gray scale shows and the colored Liquid Crystal Display And Method For Driving that shows.
Background technology
General liquid crystal display is made up of liquid crystal panel and driving circuit.Liquid crystal panel is made up of two blocks of glass therebetween liquid crystal, with the inside surface that is clipped in the contacted glass of liquid crystal wherein on transparency conductive electrode is arranged; Link to each other with above-mentioned transparency conductive electrode by the driving circuit signal wire, adopt the corresponding driving method to realize that gray scale shows and colored the demonstration.
LCD realizes that the colored method that shows mainly contains at present:
1) color filter method.The video picture principle of LCD is that liquid crystal is placed between two electro-conductive glass, by the driving of electric field between two electrodes, causes the field effect of liquid crystal molecule, with control light source transmission or shielding function, thereby image is shown.Monochromatic liquid crystal display is to have or not and size according to this voltage, and the switching of controlling the liquid crystal " light valve " of each pixel changes the transmitted intensity of each pixel, thereby presents gray scale.Colour liquid crystal display device, with respect to monochromatic liquid crystal display, increased the color filter film, each pixel all is made of R, G, 3 sub-pixels of B, the R of image, G, B signal drive corresponding sub-pixel respectively, the white illumination light of backlight presents different colours during by color filter film, realizes the demonstration of coloured image.There is following problem in this method: because the transmissivity of color filter film is about 20%～30%, a large amount of light is interdicted (1).So the adding of filter coating descends light transmission rate, on this present situation, continue to improve light utilization ratio leeway seldom, capacity usage ratio is low.(2) compare with monochromatic the demonstration, picture element density is restricted, and under the equivalent technology condition, is 1/3.If realize identical picture element density, then machining precision need improve three times, shows the manufacturing cost height, has limited the demonstration that realizes high pixel density, high brightness.(3) gray-scale Control is that transmitance by control liquid crystal cell light or transmission and the ratio of shading time realize.Generally be to select for use different driving voltages to be applied on the row driver, thereby the absolute voltage value of change row-column electrode is controlled the ratio of different light transmissions or transmission shading time according to different gradation datas.Existence causes liquid crystal shutter to respond inconsistent problem because of magnitude of voltage is different.
2) while additive color mixing method.This method is difficult to reach miniaturization and lightweight because optical system becomes complicated.
3) a preface control method.This method is that a display image is divided into three sons of R, G, B, as shown in Figure 3, and controls the demonstration of R, G, B three look backlights in order, utilizes the eye storage characteristic of human eye to realize the demonstration of coloured image.Control the gray scale demonstration of this liquid crystal cell in each son by the row drive signal, as shown in Figure 2, this gradation display method is identical with gradation control method in the color filter method, can realize the demonstration of medium tone.The field sequence controlling method has following characteristics: (1) has eliminated the light loss that color filter brings owing to do not use color filter.Showing under the prerequisite of same brightness that with the color filter mode energy that backlight consumes reduces, and compares capacity usage ratio with the color filter mode and increases.(2) owing to just can represent all colours, if adopted with former same process technology then can obtain three times image resolution ratio with a pixel.Manufacturing cost and driving circuit cost reduce.(3) the same with the color filter method, the gray-scale Control of sequence controlling method remains that transmitance by control liquid crystal cell light or transmission and the ratio of shading time realize.Generally be to select for use different driving voltages to be applied on the row driver according to different gradation datas, thereby the absolute voltage value that changes row-column electrode is controlled the ratio of different light transmissions or transmission shading time, still exists liquid crystal shutter to respond inconsistent problem.
The common issue with that above-mentioned preface control method and color filter method exist is: gray-scale Control is that transmitance by control liquid crystal cell light or transmission and the ratio of shading time realize.Generally be to select for use different driving voltages to be applied on the row driver, thereby the absolute voltage value of change row-column electrode is controlled the ratio of different light transmissions or transmission shading time, exists liquid crystal shutter to respond inconsistent problem according to different gradation datas.
Summary of the invention
In order to overcome the problem that said method exists.The present invention directly utilizes R, G, B three primary colours backlight, adopt digital synthesis technology to utilize backlight to carry out gray-scale Control, and liquid crystal cell is only simultaneously as floatless switch time and quick " light valve " that responds, thereby the colour that forms multi-stage grey scale shows, and provide a kind of color filter that need not, color liquid crystal display arrangement and the driving method thereof of low manufacturing cost.The main range of application of the present invention will be TN, STN and TFT colour liquid crystal display device and driving method thereof.
For achieving the above object, the present invention has following feature (as Fig. 4): control signal generation circuit is divided into a plurality of molecular fields with R, G, B input signal according to the gray scale display requirement; LCDs, holding liquid crystal between two glass substrates, row electrode control employing optimum voltage and time control, liquid crystal cell is only simultaneously as floatless switch time and " light valve " that respond fast; Backlight, it is configured in the back of above-mentioned liquid crystal cell, in R, G, B three primary light source are arranged; Gray scale is taken out circuit, and it takes out the grey scale signal in the source image signal, and produces the gray-scale Control signal; Backlight source driving circuit takes out the control signal control R that circuit produces according to gray scale, and G, each molecular field of B show successively, can require luminous and can be combined into the light of different colours according to difference.
In traditional field order LCD device, backlight, it is configured in the behind of liquid crystal indicator, penetrates the light of multiple color according to the predetermined cycle to above-mentioned liquid crystal display cells; Control circuit, its control be according to three sons of R, G, B, carries out and the writing of the above-mentioned corresponding video data of multiple color; The demonstration of the multiple color of each son by above-mentioned three sons synthetic shows a width of cloth coloured image.As shown in Figure 2, generally all adopt gray scale control circuit in traditional field preface control mode, select different voltages to be applied on the corresponding row electrode according to gradation data then to realize that its gray scale shows.By the electric optical characteristics of liquid crystal cell as can be known, apply response time influence bigger, the different voltage liquid crystal response speed difference of voltage, cause response speed inconsistent liquid crystal.
The present invention according to carrying out a son separating treatment, controls R, G, B three chromatic numbers simultaneously corresponding each color sub-field combination and sends different light.In this way, a frame picture is divided into several molecular fields respectively according to R, G, B order, each pixel by gating, and is cut off in other R, G, B molecular field in some R, G, B molecular field so, thereby shows the picture of different colours.In the above-mentioned state of saying the pixel gating or ending, the present invention has following feature: apply best fixed voltage on the row-column electrode of this pixel correspondence, make liquid crystal be in optimal response characteristic state.Even also this pixel liquid crystal unit is in best " switch " state, the only conduct " light valve " of this liquid crystal cells this moment, the light that makes backlight send will can be good at transmissive or well end.When this liquid crystal cells is in conducting or ends,, light corresponding backlight according to different color molecular fields and make it to send different light by The synchronized Coordinative Control.By such control, each pixel just can realize different grey levels and colored the demonstration in the frame picture.
Drive controlling step of the present invention is described below: as shown in Figure 4, after a new frame image signal begins, control signal generation circuit is under the coordination of system synchronization clock signal, will be from the R of the present frame in external image source, G, B three-channel parallel digital signal is handled by display requirement, R, G, B is divided into a plurality of molecular fields, take out circuit with R by gray scale, G, grey scale signal among the B is given backlight source driving circuit, control different colours molecular field produces different light, meanwhile corresponding row and column drives " opening " and " pass " action of finishing each pixel according to synchronous signal, thereby finishes the demonstration of coloured image.
Liquid crystal indicator of the present invention is characterized in that having: display device, and its a plurality of pixels are rectangular arrangement, and by above-mentioned a plurality of pixel display images; Backlight, it is configured in the behind of above-mentioned display device, can send the light of R, G, three kinds of colors of B, and can light luminous with predetermined order according to the different molecular field; Combination by above-mentioned R, G, many molecular fields of B shows a width of cloth coloured image.The demonstration of the backlight of different molecular field requires to modulate according to gray scale.
The driving method of liquid crystal indicator of the present invention is characterized in that comprising:
The gray-scale Control signal takes out circuit by gray scale and is sent to backlight source driving circuit, and gray scale shows by R, G, the combination of B molecular field to be finished.The row of liquid crystal indicator of the present invention drive only finishes " the opening " of liquid crystal pixel point and the action of " pass ", therefore best switching voltage signal can be set according to the electric optical property of liquid crystal, phase method than before, to each pixel, has identical liquid crystal shutter response characteristic.
Description of drawings
Fig. 1 is an expression liquid-crystal apparatus synoptic diagram of the present invention.
Fig. 2 is the theory diagram of the traditional field preface control mode of expression.
Fig. 3 is the driving method synoptic diagram of the traditional field preface control mode of expression.
Fig. 4 is an expression general principles block diagram of the present invention.
Fig. 5 is the synoptic diagram that expression the present invention realizes 4 grades of gray scales of TN, STN.
Fig. 6 is the synoptic diagram that expression the present invention realizes 4 grades of gray scales of TFT.
Fig. 7 is the synoptic diagram that expression the present invention realizes 8 grades of gray scales of TN, STN.
Fig. 8 is the synoptic diagram that expression the present invention realizes 8 grades of gray scales of TFT.
Fig. 9 is the synoptic diagram that expression the present invention realizes 16 grades of gray scales of TN, STN.
Figure 10 is the synoptic diagram that expression the present invention realizes 16 grades of gray scales of TFT.
Embodiment
The present invention is the color-sequence liquid crystal display device, as shown in Figure 1, has a plurality of pixels of rectangular arrangement, has liquid crystal display cells 1, light guide plate 2 and three primary colours backlight 2R, 2G, 2B and Drive and Control Circuit printed panel 3; Above-mentioned liquid crystal display cells 1 is according to video data, and the voltage that correspondence puts on the electrode of each pixel makes " light valve " switch motion, controls the light transmission of this pixel or ends.The three primary colours backlight sends R, G, B three coloured light, by above-mentioned light guide plate to the uniform leaded light of liquid crystal display cells.
After a new frame image signal begins, control signal generation circuit is under the coordination of system synchronization clock signal, to handle by display requirement from R, G, the B three-channel parallel digital signal of the present frame in external image source, R, G, B are divided into a plurality of molecular fields, take out circuit by gray scale and give backlight source driving circuit the grey scale signal among R, G, the B, control different colours molecular field produces different light, meanwhile corresponding row, column drives " opening " and " pass " action of finishing each pixel according to synchronous signal, thereby finishes the demonstration of coloured image.
Specify the realization of driving method below.
Example 1: with Fig. 5 is that example illustrates how the present invention realizes TN, the demonstration of 4 grades of gray scales of each color of STN.At this, with R, G, three kinds of colors of B, each is divided into sub-field 1 of R and R field 2 according to 1: 2 ratio, sub 2 of G field 1 and G, sub 1 of B and the sub-field 2 of B.The realization that with R is its grey level of example is as shown in table 1." ON " represents that this child field shows that " OFF " represents that this child field does not show in the table.
| R field 1 | R field 2 | Gray scale |
| OFF | OFF | 0 |
| ON | | 1 |
| OFF | ON | 2 |
| ON | ON | 3 |
Table 1
When R 1 and R 2 do not show, corresponding grey scale " 0 "; When 1 demonstration of R, when R field 2 does not show, corresponding grey scale " 1 "; When R 1 does not show, and R 2 is when showing, corresponding grey scale " 2 "; When R 1 and R 2 all shows, corresponding grey scale " 3 "; Therefore can realize 4 grades of gray scales of R look, similarly method can realize 4 grades of gray scales of G, B look respectively, can reproduce 64 looks.
Example 2: with Fig. 7 is that example illustrates how the present invention realizes TN, the demonstration of 8 grades of gray scales of each color of STN.At this, with R, G, three kinds of colors of B, each is divided into the sub-field 1 of R, R field 2 and R field 3 according to 1: 2: 4 ratio; Sub 1 of G, G field 2 and G field 3; Sub 1 of B, B field 2 and B field 3.The realization that with R is its gray scale of example is as shown in table 2." ON " represents that this child field shows that " OFF " represents that this child field does not show in the table.
| R field 1 | R field 2 | R field 3 | Gray scale |
| OFF | OFF | OFF | 0 |
| ON | OFF | OFF | 1 |
| OFF | ON | OFF | 2 |
| ON | ON | OFF | 3 |
| OFF | OFF | ON | 4 |
| ON | OFF | ON | 5 |
| OFF | ON | ON | 6 |
| ON | ON | ON | 7 |
Table 2
The analysis of similar example 1 can realize 8 grades of gray scales of R look, and similarly method can realize 8 grades of gray scales of G, B look respectively, can realize 512 looks.
Example 3: with Fig. 9 is that example illustrates how the present invention realizes TN, the demonstration of 16 grades of gray scales of each color of STN.At this, with R, G, three kinds of colors of B, each was according to 1: 2: 4: 8 ratios are divided into the sub-field 1 of R, the sub-field 2 of R, R field 3 and the sub-field 4 of R, sub 1 of G, the sub-field 2 of G, the sub-field 3 of G and G field 4, the sub-field 1 of B, sub 2 of B, the sub-field 3 of B and the sub-field 4 of B.The realization that with R is its grey level of example is as shown in table 3." ON " represents that this child field shows that " OFF " represents that this child field does not show in the table.The realization of a son combination and gray scale thereof is as shown in table 3.Can reproduce 4096 looks.
Same way can realize in the TFT liquid crystal display that the coloured image of multi-stage grey scale shows, as Fig. 6, Fig. 8 and shown in Figure 10, can realize 4 grades respectively, 8 grades and 16 grades of gray scales demonstrations.Describe as above-mentioned embodiment, the invention provides the color-sequence liquid crystal display packing that a seed field drives display pixel and the demonstration of backlight realization multi-stage grey scale.In addition, the present invention is not limited only to above-mentioned embodiment and above-mentioned grey level, for example can realize removing gray scale shown in above each example still less or more gray level and color show.Also comprise all distortion in the said method scope or analogize the method for implementing.
| R field 1 | R field 2 | R field 3 | R field 4 | Gray scale | |
| OFF | OFF | OFF | OFF | 0 | |
| ON | | OFF | OFF | 1 | |
| OFF | ON | OFF | OFF | 2 | |
| ON | ON | OFF | OFF | 3 | |
| OFF | OFF | ON | OFF | 4 | |
| ON | OFF | ON | OFF | 5 | |
| OFF | ON | ON | OFF | 6 | |
| ON | ON | ON | OFF | 7 | |
| OFF | OFF | OFF | ON | 8 | |
| ON | OFF | OFF | ON | 9 | |
| OFF | ON | OFF | ON | 10 | |
| ON | ON | OFF | ON | 11 | |
| OFF | OFF | ON | ON | 12 | |
| ON | OFF | ON | ON | 13 | |
| OFF | ON | ON | ON | 14 | |
| ON | ON | ON | ON | 15 |
Table 3
Claims (5)
1. liquid crystal indicator and driving method thereof is characterized in that:
Have display device, its a plurality of pixels are rectangular arrangement, and by above-mentioned a plurality of pixel display images; Backlight, it is configured in the behind of above-mentioned display device, lights luminous according to the different molecular field successively with preset time; Control signal generation circuit, it is divided into a plurality of molecular field data storage according to each color with a frame picture of a width of cloth coloured image respectively, and produces drive signal; Gray scale is taken out circuit, and the grey scale signal in the picture signal is taken out control R, G, the demonstration of B backlight realization gray scale; Backlight source driving circuit drives backlight and sends the light of various combination according to R, G, each molecular field of B, realizes that coloured image shows.
2. liquid crystal indicator and driving method thereof is characterized in that:
Have the gray scale isolation technics, take out circuit, the grey scale signal in the source images is separated, give the backlight driver control circuit by gray scale, control R, G, each molecular field of B successively preface to show different gray scales and color.
3. liquid crystal indicator and driving method thereof is characterized in that:
Take out circuit based on the gray scale described in the claim 1, the grey scale signal in the picture signal is taken out control R, G, the demonstration of B backlight realization gray scale.Show needs according to gray scale and color, R, G, B field are divided into several molecular fields, the division of each molecular field is pressed the brightness requirement of demonstration output with 1:2:4:8:16:32:64 ... rule analogize, show needs until reaching gray scale and color.
4. liquid crystal indicator and driving method thereof is characterized in that:
Take out circuit based on the gray scale described in the claim 1, the grey scale signal in the picture signal is taken out control R, G, the demonstration of B backlight realization gray scale.Show needs according to gray scale and color, R, G, B field are divided into several molecular fields, the division of each molecular field is pressed backlight self luminosity with 1:2:4:8:16:32:64 ... rule analogize.Based on the characteristic of liquid crystal display device,, show needs until reaching gray scale and color through suitable correction.
5. liquid crystal indicator and driving method thereof is characterized in that:
The row electrode of liquid crystal display can apply best voltage signal.This voltage signal " is opened " or " pass " liquid crystal display on request, so that liquid crystal cell can reach response speed of the best and good on off state.
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| CN101136188B (en) * | 2007-09-30 | 2010-04-21 | 友达光电股份有限公司 | Colors sequence type LCD and driving method thereof |
| CN101308633B (en) * | 2007-05-14 | 2011-01-19 | 联詠科技股份有限公司 | Color sequence control method, and backlight module and display apparatus using the same |
| CN101202023B (en) * | 2006-11-30 | 2011-12-07 | 夏普株式会社 | Liquid crystal display with area adaptive backlight |
| CN102334062A (en) * | 2009-03-19 | 2012-01-25 | 夏普株式会社 | Area adaptive backlight display and method with reduced computation and halo artifacts |
| CN101266765B (en) * | 2007-03-16 | 2012-02-08 | 统宝光电股份有限公司 | Color sequential backlight liquid crystal displays and related methods |
| CN101231402B (en) * | 2007-01-26 | 2012-09-26 | 群康科技(深圳)有限公司 | Liquid crystal display panel |
| CN101206840B (en) * | 2006-12-22 | 2013-05-15 | 三星电子株式会社 | Display apparatus and control method thereof |
| CN101388194B (en) * | 2008-08-26 | 2013-11-06 | 矽创电子股份有限公司 | Control circuit of color sequential LCD equipment and scanning method |
| CN101739984B (en) * | 2009-12-16 | 2014-04-02 | 康佳集团股份有限公司 | Liquid crystal without color film and color displaying method thereof |
| CN104299575A (en) * | 2013-12-13 | 2015-01-21 | 天津三星电子有限公司 | Sequential color mixing display control method and device and displayer |
| CN107086029A (en) * | 2017-06-12 | 2017-08-22 | 深圳Tcl新技术有限公司 | Color generation method, device and readable storage medium storing program for executing based on liquid crystal display module |
| WO2019128186A1 (en) * | 2017-12-26 | 2019-07-04 | 深圳Tcl新技术有限公司 | Display module drive circuit and method, and display device |
| CN111554239A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Backlight control method, device and storage medium |
| CN111710306A (en) * | 2020-06-28 | 2020-09-25 | 深圳康佳电子科技有限公司 | Self-luminous LCD (liquid crystal display) screen, display device and television |
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- 2005-05-18 CN CN 200510073683 patent/CN1866344A/en active Pending
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| CN101202023B (en) * | 2006-11-30 | 2011-12-07 | 夏普株式会社 | Liquid crystal display with area adaptive backlight |
| CN101206840B (en) * | 2006-12-22 | 2013-05-15 | 三星电子株式会社 | Display apparatus and control method thereof |
| CN101231402B (en) * | 2007-01-26 | 2012-09-26 | 群康科技(深圳)有限公司 | Liquid crystal display panel |
| CN101266765B (en) * | 2007-03-16 | 2012-02-08 | 统宝光电股份有限公司 | Color sequential backlight liquid crystal displays and related methods |
| CN101308633B (en) * | 2007-05-14 | 2011-01-19 | 联詠科技股份有限公司 | Color sequence control method, and backlight module and display apparatus using the same |
| CN101136188B (en) * | 2007-09-30 | 2010-04-21 | 友达光电股份有限公司 | Colors sequence type LCD and driving method thereof |
| CN101388194B (en) * | 2008-08-26 | 2013-11-06 | 矽创电子股份有限公司 | Control circuit of color sequential LCD equipment and scanning method |
| CN104361868A (en) * | 2009-03-19 | 2015-02-18 | 夏普株式会社 | Method used for displaying images on liquid crystal display and liquid crystal display |
| CN102334062A (en) * | 2009-03-19 | 2012-01-25 | 夏普株式会社 | Area adaptive backlight display and method with reduced computation and halo artifacts |
| CN102334062B (en) * | 2009-03-19 | 2014-12-24 | 夏普株式会社 | Method for displaying image on liquid crystal display |
| CN101739984B (en) * | 2009-12-16 | 2014-04-02 | 康佳集团股份有限公司 | Liquid crystal without color film and color displaying method thereof |
| CN104299575A (en) * | 2013-12-13 | 2015-01-21 | 天津三星电子有限公司 | Sequential color mixing display control method and device and displayer |
| CN107086029A (en) * | 2017-06-12 | 2017-08-22 | 深圳Tcl新技术有限公司 | Color generation method, device and readable storage medium storing program for executing based on liquid crystal display module |
| WO2019128186A1 (en) * | 2017-12-26 | 2019-07-04 | 深圳Tcl新技术有限公司 | Display module drive circuit and method, and display device |
| CN111554239A (en) * | 2020-05-22 | 2020-08-18 | Tcl华星光电技术有限公司 | Backlight control method, device and storage medium |
| CN111710306A (en) * | 2020-06-28 | 2020-09-25 | 深圳康佳电子科技有限公司 | Self-luminous LCD (liquid crystal display) screen, display device and television |
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