CN101290412B - driving system of liquid crystal display - Google Patents
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- CN101290412B CN101290412B CN200710098314XA CN200710098314A CN101290412B CN 101290412 B CN101290412 B CN 101290412B CN 200710098314X A CN200710098314X A CN 200710098314XA CN 200710098314 A CN200710098314 A CN 200710098314A CN 101290412 B CN101290412 B CN 101290412B
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Abstract
The invention discloses a driving system of a liquid crystal display, which senses the temperature of a liquid crystal panel through at least one temperature sensing element, outputs a corresponding voltage value of gamma compensation according to the sensed temperature, further receives the voltage value of the gamma compensation through an overdrive driving compensation unit, and obtains the overdrive compensation voltage value of a two-gamma overdrive compensation curve corresponding to the range of the liquid crystal panel and a temperature gradient in a gamma mapping mode; or an overdriven drive compensation unit is used for deducing a corresponding local compensation data table according to the temperature and the compensation data table, deducing at least one overdriven compensation data table according to the temperature gradient change of the range of the liquid crystal panel, and compensating a display image output after being processed by an overdriven drive lookup table. Therefore, the intensity of the over-excitation driving voltage of the liquid crystal panel is adjusted, and the response speed of the liquid crystal display is improved.
Description
Technical field
The invention relates to a kind of drive system of LCD, particularly about using the regional temperature of temperature-sensing element detecting liquid crystal panel, the thermograde of corresponding liquid crystal panel is used the drive system of adjusting too drastic driving voltage, promotes the LCD response speed.
Background technology
Along with day by day popularizing of LCD, it is various that the scope of its application also is tending towards, and from early stage computing machine, electronic clock and radio etc., to notes type, desktop computer and TV etc., thereby traditional cathode-ray tube display is substituted gradually.
Because the liquid crystal molecule characteristic of LCD, when switching image data, must be by reversing molecule changing its orientation, so that picture is delayed is very common.And passing when being applied to computer, mostly all to present static image, then lag is more not obvious.When only being applied to TV, recreation and movie, owing to mostly be dynamic image, picture delays causing image fog and contrast distortion, and meaning is that the response time (response time) of liquid crystal is slow excessively.At the problems referred to above, too drastic driving (overdrive) technology is satisfied quilt and is developed to improve the reaction velocity of liquid crystal, its principle is to improve driving voltage to quicken the reaction velocity of liquid crystal, meaning promptly changes the voltage that is supplied to source electrode driver (sourcedriver) in the LCD, to stimulate reversing of liquid crystal molecule.
See also Fig. 1, be the sequential chart of pixel voltage in the prior art LCD and its light penetration rate V1.Pixel voltage is to indicate with solid line among the figure, and light penetration rate V1 indicates with dotted line.When the pixel (pixel) in the LCD switches to data voltage C2 by data voltage C1, because the characteristic of liquid crystal molecule has a time delay when charging, make its liquid crystal molecule to arrive predetermined angle to reach predetermined light penetration rate at a picture frame cycle (frame period) intrinsic deflection.As shown in Figure 1, picture frame N represents the length in a picture frame cycle, picture frame N+1, N+2... then represent the picture frame N continuous next picture frame cycle afterwards that is next to, and shown in the light transmittance V1 curve among Fig. 1, light penetration rate V1 can't arrive predetermined penetrance at the picture frame of picture frame N in the cycle, and the picture frame cycle that must wait until picture frame N+2 just can arrive predetermined penetrance, yet such delay but can make LCD the phenomenon of ghost occur.
Continue, see also Fig. 2, the sequential chart of its pixel voltage and its light penetration rate V2 when using extremely drive method for prior art.When the pixel in the LCD switches to data voltage C2 by data voltage C1,, accelerate the reaction velocity of its liquid crystal molecule by adding a too drastic data voltage C3.As shown in Figure 2, promptly when data voltage C1 switches to higher data voltage C2, add the too drastic data voltage C3 higher earlier than data voltage C2, and because higher data voltage can make the liquid crystal reaction velocity faster, so can make the liquid crystal molecule of pixel can deflect to predetermined angular in the cycle and reach predetermined light penetration rate at a picture frame by this extremely drive method.As shown in Figure 2, light penetration rate V2 has promptly reached predetermined penetrance in the picture frame cycle of picture frame N.
Only above-mentioned prior art is because be to bestowing identical too drastic data voltage in the whole liquid crystal panel, limited for the effect of delaying of improving liquid crystal molecule, when Zhao Yin reverses because of change in voltage in the liquid crystal molecule of liquid crystal panel, its response time can be because of the difference of temperature in each zone of panel difference to some extent, very fast as the higher then response time of temperature, on the contrary then the response time needs stronger voltage slowly.For overcoming this problem, further set up again a temperature-sensitive sticker (thermalsensor) in display panels in detecting temperature mode.See also Fig. 3, be applied to the block schematic diagram of the driving circuit of display panels for prior art.This driving circuit 1 comprises an image input end 111, an image control module 113, a portrait memory body 114, one too drastic driving look-up table 112, a memory body control module 117, a temperature controller 115, one temporary memory body 116, time schedule controller (timing controller) 118 and one temperature-sensitive sticker 101.Temperature-sensitive sticker 101 is to be arranged on the display panels 10 to produce a temperature compensation signal St according to panel 10 temperature, image input end 111 is an input present data and further transfer to too drastic driving look-up table 112 and image control module 113, then the present data of image control module 113 subsequent transmissions is to 114 storages of portrait memory body, after present data is delayed a picture frame cycle (frame period), in being stored in portrait memory body 114, reading out and be sent to too drastic driving look-up table 112, and the present data that postpones a picture frame cycle will be defined as over data, temperature compensation this moment signal St transfers to temperature controller 115 and selects a parameter list so that memory body control module 117 will be stored in the plurality of parameters table of keeping in memory body 116 according to temperature compensation signal St, and be sent to too drastic driving look-up table 112, and will adjust the too drastic driving voltage value (overdrive code) that is then produced by time schedule controller 118 and be sent to display panels 10 so that too drastic driving look-up table 112 running is adjusted.
Only display panels may be applied under the different condition and room temperature, then the too drastic driving voltage of adjustment need be waited until display starting execution just now after a working temperature or an equilibrium temperature, and temperature-sensitive sticker is the temperature in a panel zone (panel area) of detecting environment temperature or display panels, as other regional temperature of panel, the footpath compensates with identical too drastic driving voltage.And the temperature of panel has drop mostly, and generally speaking the upper area temperature of panel can be high than lower area, maximizes with LCD TV size trend, and then the gap of thermograde variation is very obvious.And then cause the too drastic driving voltage value that gives display panels that provides accurate corresponding said temperature graded to compensate, in brief, the known too drastic driving voltage value that produces is only reached optimization for the particular panel zone, and for causing power to differ in other zones, then image definition is also therefore influenced.
Because above problem.The inventor through research and design and special topic discussion in many ways, proposes a kind of drive system of LCD with an implementation and foundation as the aforementioned disappearance of improvement in the present invention based on going in for the study for many years and many practical experience then.
Summary of the invention
Because above-mentioned problem, purpose of the present invention is to consider that the thermograde of liquid crystal panel is to compensate too drastic driving voltage for a kind of drive system of LCD is provided.
Edge is, for reaching above-mentioned purpose, according to the drive system that is used for LCD of the present invention, comprise a liquid crystal panel, a portrait memory body, at least one temporary memory body, an image input end, a memory body control module, an image control module, a too drastic driving look-up table, a too drastic driving compensating unit and a time schedule controller at least.
Have a plurality of driving elements and a temperature-sensing element in the liquid crystal panel, driving element is to show a picture in order to receive a display signal to drive liquid crystal panel, and temperature-sensing element is in order to respond to a temperature of this liquid crystal panel.The portrait memory body and function is to store an image data; The magnitude of voltage of temporary memory used for storing complex gamma compensation.The image input end is in order to image data of new input.The memory body control module is in order to export the magnitude of voltage of corresponding gamma compensation according to the temperature of temperature-sensing element, and search image output overdrive voltage value, and transmission temperature, the image control module is in order to extract last image data, too drastic driving look-up table is in order to a newer image data and last image data, produce a comparison result value, search and read corresponding image overdrive voltage value according to this comparison result value by this memory body control module and compensate a new image data, to export a show image, too drastic driving compensating unit is in order to receive show image, the magnitude of voltage and the temperature of gamma compensation, the too drastic bucking voltage value of the too drastic compensated curve of gamma up and down of one thermograde of the scope that obtains corresponding liquid crystal panel in gamma mapping (gamma mapping) mode by the magnitude of voltage and the temperature of gamma compensation, according to too drastic bucking voltage value is the compensation show image, time schedule controller is in order to export the corresponding driving element of the display signal of show image in liquid crystal panel that compensated, driving element is electrically connected to a plurality of sweep traces and a plurality of data lines of liquid crystal panel, to control the required too drastic driving voltage of each pixel, quicken the liquid crystal molecule response time, promote the LCD response speed.
Further, this drive system also can utilize at least one too drastic compensation information table that the compensation information table obtains zone out of the ordinary with the compensation show image, and this drive system more can use a plurality of temperature-sensing elements with the zones of different temperature of detecting liquid crystal panel and at deriving corresponding to the compensation information table of indivedual temperature-sensing elements and at least one too drastic compensation information table in the corresponding zone out of the ordinary of whole liquid crystal panel too drastic driving voltage with the compensation show image.
The invention has the beneficial effects as follows the too drastic bucking voltage value or the too drastic compensation information table that are to utilize the too drastic compensation of gamma, except compensating according to different temperatures, the intensity of different too drastic driving voltage more can be provided the zones of different of liquid crystal panel, variation with accurate corresponding temperature gradient, and then quicken the liquid crystal molecule response time, and improve picture quality.
Description of drawings
Fig. 1 is the sequential chart of pixel voltage and its light penetration rate V1 in the prior art LCD;
The sequential chart of its pixel voltage and its light penetration rate V2 when Fig. 2 uses extremely drive method for prior art;
Fig. 3 is applied to the block schematic diagram of the driving circuit of display panels for prior art;
Fig. 4 is the block schematic diagram of the drive system of the present invention's one LCD;
Fig. 5 is the curve map that utilizes the obtained too drastic compensated curve of two gammas of gamma mapping mode of the present invention;
Fig. 6 is the block schematic diagram of the drive system of another LCD of the present invention;
Fig. 7 is the compensation information table of the drive system of another LCD of the present invention;
Fig. 8 is another embodiment of the present invention, is the block schematic diagram of the drive system of another LCD;
Fig. 9 is for according to top and bottom compensation information table D and E in the another drive system that is applied to LCD of the present invention shown in Figure 8; And
Figure 10 is another embodiment of the present invention, is the block schematic diagram of the drive system of a LCD again.
The figure number explanation
1: driving circuit; 10: display panels;
101: temperature-sensitive sticker; 111: the image input end;
112: too drastic driving look-up table; 113: the image control module;
114: the portrait memory body; 115: temperature controller;
116: temporary memory body; 117: the control module of tabling look-up;
118: time schedule controller; 20,40,60,70: drive system;
21: liquid crystal panel; 22: the portrait memory body;
23: temporary memory body; 24: the image input end;
25: the memory body control module; 26: the image control module;
27: too drastic driving look-up table; 28: too drastic driving compensating unit;
29: time schedule controller;
211,212,213,214,215,216: temperature-sensing element; And
30: the temperature-sensitive control module.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, hereinafter, enumerate related embodiment, and cooperate appended correlative type according to the drive system that is used for LCD of the present invention, be described in detail below, wherein components identical will be illustrated with the components identical symbol.
See also Fig. 4, be the block schematic diagram of the drive system of the present invention's one LCD, wherein native system 20 is to comprise a liquid crystal panel 21, a portrait memory body (frame memory) 22 and one temporary memory body (ROM) 23, an image input end 24, a memory body control module (ROM controller) 25, one image control module (frame memory controller) 26, one too drastic driving look-up table (OD LUT) 27, one too drastic driving compensating unit (ODcompensation unit) 28 and time schedule controller (Timingcontroller) 29.
Driving element is a plurality of sweep traces and a plurality of data line that is electrically connected to liquid crystal panel.The middle part that temperature-sensing element 211 can be a temperature-sensitive sticker and is located at liquid crystal panel 21 is in order to produce a temperature signal, and this temperature signal then can transfer to a temperature-sensitive control module 30 and export the foundation of the magnitude of voltage of corresponding gamma compensated curve so that memory body control module 25 to be provided.Portrait memory body 22 is generally a dynamic access memory body (Dynamic RandomAccess Memory, DRAM), wherein the dynamic access memory body can be a synchronous Dynamic Random Access Memory (Synchronous Dynamic RandomAccess Memory, SDRAM), in order to storing image data.And one temporary memory body 23 be generally a ROM (Read Only Memory, ROM), and ROM be in order to the corresponding gamma voltage output valve of storage complex.Gamma mapping (gamma mapping) mode relates to a kind of Gamma correction, the gray code method mapping (mapping) that the GTG of image data is presented scope to one with the gray code method of the corresponding corresponding grey-scale range of this scope, and maximum gamma voltage is improved and the reduction of minimum gamma voltage, in order to compensate the gamma voltage of corresponding gray code method, display signal can be the gamma voltage after the compensation.The image data of being imported is to transfer to image control module 26 and too drastic driving look-up table 27 by red, green, blue (RGB) three primary colors that respectively are 8 bits, image data is respectively in order to control pixel in the GTG value of red, green, blue, and the grey exponent number of each color is 256 rank (meaning i.e. two eight powers), so for reaching by the formed full-color image of RGB, then pixel needs the image data of 20 nibbles (promptly eight taking advantage of three).
Fig. 5 is for utilizing the curve map of the obtained too drastic compensated curve of two gammas of gamma mapping mode in the drive system of LCD of the present invention, the longitudinal axis is too drastic driving voltage value; Transverse axis is respectively a last pen and a new image digit value.When the gray code method 240 of image data maps to gray code method (gray-code) the 255th, for for the gamma voltage after the wherein compensation of the bottom of liquid crystal panel, and gray code method 224 is for for the gamma voltage after another compensation on the top of liquid crystal panel.
See also Fig. 6, block schematic diagram for the drive system of another LCD of the present invention, as shown in Figure 4, native system 40 also comprises liquid crystal panel 21, synchronous dynamic random-access memory body 22 and ROM 23, image input end 24, memory controller 25, image controller 26, too drastic driving look-up table 27, too drastic driving compensating unit 28 and time schedule controller 29.
Note that image input end 24, image controller 26, synchronous dynamic random-access memory body 22 and too drastic driving look-up table 27 for the processing mode of image data as shown in Figure 4, no longer repeat at this.Be located at the temperature of the temperature-sensitive sticker 211 detecting panels of liquid crystal panel 21 middle parts this moment, and warm sense controller 30 is the temperature-sensitive signals that temperature produced according to temperature-sensitive sticker 211 detectings, the corresponding Temperature Compensation MSDS of output is passed to too drastic driving compensating unit 28 again to too drastic driving look-up table 27 in default complex compensation information table (overdrive LUT).Wherein too drastic driving compensating unit 28 reaches from memory controller 25 pairing panel zone temperature in order to the too drastic driving look-up table that receives show image, compensation information, too drastic driving look-up table and temperature by compensation information are extrapolated corresponding two local equalize's MSDSs, by and a thermograde of the scope of corresponding liquid crystal panel 21 extrapolate at least one too drastic compensation information table, and compensate the show image that too drastic driving look-up table 27 is exported according to too drastic compensation information table.See through the driving element (figure do not show) of a display signal of the corresponding show image that has compensated of time schedule controller 29 outputs, and then drive liquid crystal panel 21 to show a picture in liquid crystal panel 21.
Fig. 7 is the compensation information table of the drive system of another LCD of the present invention, wherein the compensation information Table A is the source book table, its line is as benchmark and difference corresponding new one and last image data with interval 4 with stringer, when temp-sensing element records the temperature of liquid crystal panel, obtain the liquid crystal panel upper area of corresponding source book table and two compensation information table B and C of lower area, and extrapolate at least one too drastic compensation information table of a thermograde that meets the liquid crystal panel scope by a compensation method (as: interpolation method ...).And the interpolation method can be linearity, bilinearity interpolation method or other interpolation algorithms.Because the upper area of liquid crystal panel is higher temperature (being that reaction velocity is very fast) to be arranged shown in compensation information table B, and lower area is lower temperature (being that reaction velocity is slower) to be arranged shown in compensation information table C, for the then then corresponding fine setting of intensity of too drastic driving voltage of above-mentioned characteristic, in compensation information table for upper area, its value subtracts 2, otherwise in the compensation information table for lower area, its value then adds 1, in like manner, the too drastic compensation information table of calculating according to thermograde is to adjust the too drastic driving voltage intensity of whole liquid crystal panel.Make the display signal intensity that driving element received in the liquid crystal panel can reach uniformity.
See also Fig. 8, be another embodiment of the present invention, block schematic diagram for the drive system of another LCD, as shown in Figure 4, native system 60 comprises liquid crystal panel 21, synchronous dynamic random-access memory body 22 and ROM 23, image input end 24, memory controller 25, image controller 26, too drastic driving look-up table 27, too drastic driving compensating unit 28 and time schedule controller 29.
Note that image input end 24, image controller 26, synchronous dynamic random-access memory body 22 for the processing mode of image data as shown in Figure 4, no longer repeat at this.Remarkable different these too drastic driving look-up tables that are of wherein too drastic driving look-up table 27 and Fig. 4 are according to the different two too drastic driving look-up tables that read in of liquid crystal panel regional temperature, its main practice is that 21 of liquid crystal panels have two temperature- sensitive stickers 211 and 212, is arranged at the top of liquid crystal panel 21 and lower area respectively in order to the detecting panel temperature.This moment, warm sense controller 30 was the temperature-sensitive signals that temperature produced that detect respectively according to temperature- sensitive sticker 211 and 212, the two too drastic driving look-up tables of exporting corresponding indivedual temperature- sensitive sticker 211 and 212 are passed to too drastic driving compensating unit 28 again to too drastic driving look-up table 27.28 of too drastic driving compensating units receive the too drastic driving look-up table of show image, corresponding indivedual temperature- sensitive stickers 211 and 212 and from the temperature of memory controller 25, thermograde by the scope of the corresponding liquid crystal panel 21 of too drastic driving look-up table and temperature is extrapolated at least one too drastic compensation information table, and compensates the show image that too drastic driving look-up table 27 is exported according to too drastic compensation information table.See through the driving element (figure do not show) of a display signal of the corresponding show image that has compensated of time schedule controller 29 outputs, and then drive liquid crystal panel 21 to show a picture in liquid crystal panel 21.
Fig. 9 is according to the top in the drive system of the another LCD of the present invention shown in Figure 8 and bottom compensation information table D and E, these top and the bottom compensation information table D and E be according to the set panel that temperature-sensitive sticker is surveyed of the upper area of liquid crystal panel and lower area up and down regional temperature be written into, afterwards too drastic driving look-up table is handled the show image of back output, utilize the interpolation method to be calculated according to the thermograde of liquid crystal panel scope by too drastic driving compensating unit by top and the bottom compensation information table D and E, and and then compensation show image.In addition, when healing the top of inclined to one side panel, will increase for the proportion of the too drastic driving voltage intensity on top as the voltage of putting on driving element; When healing the bottom of inclined to one side panel, then can increase for the proportion of the too drastic driving voltage intensity of bottom as the voltage of putting on driving element, promptly via zones of different to carry out interpolation.
Further, the temperature-sensitive sticker that is arranged at liquid crystal panel 21 more can be drive systems 70 as shown in figure 10 such as a plurality of 211,212,213,214,215,216, and it is arranged at the top and the lower area of panel.Then 25 of memory controllers correspond to the compensation information tables of temperature-sensitive sticker number according to temperature-sensitive sticker 211,212,213,214,215 and the output of 216 measured temperatures, subsequent step is then as shown in Figure 6, then too drastic driving look-up table 27 receives a plurality of too drastic driving look-up table of corresponding temperature-sensitive sticker 211,212,213,214,215 and 216, is passed to too drastic driving compensating unit 28 again.Too drastic driving compensating unit 28 receives show image, corresponding temperature-sensitive sticker 211,212,213,214,215 and 216 a plurality of too drastic driving look-up table reaches the temperature from memory controller 25, thermograde by the scope of the corresponding liquid crystal panel 21 of a plurality of too drastic driving look-up tables and temperature is to extrapolate at least one too drastic compensation information table, according to too drastic compensation information table is the show image that the too drastic driving look-up table 27 of compensation is exported, and exported to the driving element of liquid crystal panel 21, and then drive liquid crystal panel 21 to show a picture by time schedule controller 29.
The above only is an illustrative, but not is restricted person.Press, allly be familiar with this technology personage,, do not break away from spirit of the present invention and category any, and, all should be contained in the claim scope of the present invention its equivalent modifications of carrying out or change according to the disclosed technology contents of the present invention.
Claims (24)
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| CN200710098314XA CN101290412B (en) | 2007-04-19 | 2007-04-19 | driving system of liquid crystal display |
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| CN200710098314XA CN101290412B (en) | 2007-04-19 | 2007-04-19 | driving system of liquid crystal display |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102169673A (en) * | 2010-02-26 | 2011-08-31 | 深圳华映显示科技有限公司 | Overdrive device and method |
| KR101281989B1 (en) * | 2010-04-21 | 2013-07-03 | 엘지디스플레이 주식회사 | Apparatus and method for driving liquid crystal display device |
| KR101729524B1 (en) * | 2010-10-28 | 2017-04-24 | 엘지전자 주식회사 | Apparatus for displaying image and method for operating the same |
| CN102169680B (en) * | 2011-03-04 | 2013-02-06 | 深圳市华星光电技术有限公司 | Liquid crystal display module and its response speed adjustment method |
| US8791936B2 (en) | 2011-03-04 | 2014-07-29 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD module and method for adjusting response time period thereof |
| CN105632449B (en) * | 2016-04-06 | 2018-04-10 | 京东方科技集团股份有限公司 | The gamma electric voltage adjusting method and device of a kind of display panel |
| CN112634831B (en) * | 2020-12-11 | 2021-11-09 | 南京芯视元电子有限公司 | Temperature self-adaptation OLED drive circuit |
| CN114373432B (en) * | 2021-12-30 | 2023-10-24 | 长沙惠科光电有限公司 | Side-in type liquid crystal display panel and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311504A (en) * | 2000-02-29 | 2001-09-05 | 松下电器产业株式会社 | Liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1311504A (en) * | 2000-02-29 | 2001-09-05 | 松下电器产业株式会社 | Liquid crystal display |
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