CN105096875A - Gray-scale control method, gray-scale control device and liquid crystal display screen - Google Patents
Gray-scale control method, gray-scale control device and liquid crystal display screen Download PDFInfo
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Abstract
The embodiments of the invention disclose a gray-scale control method, a gray-scale control device and a liquid crystal display screen. The gray-scale control method can comprise: dividing a valid display area of the liquid crystal display screen into at least two subareas; acquiring the gray-scale value of each of the at least two subareas in real time, and determining the current gray-scale interval of each subarea according to the acquired gray-scale value; and respectively compensating the gray-scale value of each subarea according to the current backlight driving current of the liquid crystal display screen, the current gray-scale interval of each subarea and the corresponding relationship among the preset backlight driving current, the gray-scale interval and the gray-scale compensation value. By adopting the embodiments, the gray-scale value of each subarea in the valid display area can be effectively compensated, so that the brightness uniformly of the liquid crystal display screen is improved.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of GTG control method, GTG control device and LCDs.
Background technology
In recent years, the develop rapidly of intelligent terminal technology, consumer is to the display effect of intelligent terminal, and especially the requirement of show uniformity also improves day by day.The screen that the intelligent terminals such as current mobile phone, panel computer adopt mostly is LCDs.Nowadays the many employings of the LCDs on market LED (LightEmittingDiode, light emitting diode) is as backlight.Although the light that LED sends can outgoing comparatively equably after light guide plate scattering, but for display screen, can there is slight display non-uniform phenomenon unavoidably, such as center Screen brightness ratio edge brightness is slightly high or screen edge brightness ratio central brightness is slightly high.
But order in recent years field of liquid crystal display be absorbed in the dimensional problem overcoming LCDs, nowadays the screen of intelligent terminal is increasing, the proportion that the power consumption of LCD screen backlight accounts for Overall Power Consumption is also increasing, the technology also studied application gradually of various reduction backlight power consumption, such as LABC (LightAdaptiveBrightnessControl, ambient light adaptive backlight control) technology, CABC (ContentAdaptiveBrightnessControl, content-adaptive backlight control) technology etc.Although prior art solves the dimensional problem of LCDs and the problem of backlight high power consumption, the brightness uniformity for LCDs does not provide good solution.
Summary of the invention
The embodiment of the present invention provides a kind of embodiment of the present invention to provide a kind of GTG control method, GTG control device and LCDs, can improve the homogeneity of LCDs,
Embodiment of the present invention first aspect provides a kind of GTG control method, and described GTG control method comprises:
The territory, effective display area of LCDs is divided at least two sub regions;
The grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained;
The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset backlight drive electric current, GTG compensates respectively.
In conjunction with first aspect, in the embodiment that the first is feasible, under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in multiple backlight drive electric current, the first corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of the GTG at the described backlight drive electric current current according to described LCDs, the described current place of each sub regions interval and that preset backlight drive electric current, GTG compensates respectively, is specially:
If the backlight mode of described LCDs is content-adaptive backlight control CABC pattern, then compensate respectively according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions grey decision-making of the first corresponding relation to described each sub regions that be interval and that preset.
In conjunction with first aspect, in the embodiment that the second is feasible, under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in specific backlight drive electric current, the second corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of the GTG at the described backlight drive electric current current according to described LCDs, the described current place of each sub regions interval and that preset backlight drive electric current, GTG compensates respectively, comprising:
If the backlight mode of described LCDs is not CABC pattern, then determine that the backlight drive electric current of described LCDs is described specific backlight drive electric current;
According to the GTG at the described current place of each sub regions, the interval and grey decision-making of the second corresponding relation to described each sub regions compensates respectively.
In conjunction with the first feasible embodiment of first aspect, in the embodiment that the third is feasible, at least two sub regions described in described Real-time Obtaining each sub regions grey decision-making before, described GTG control method also comprises:
Obtain described LCDs GTG-brightness curve and under described multiple backlight drive electric current the brightness uniformity data of described each sub regions;
Described GTG-brightness curve is divided at least two GTG intervals according to slope;
Described first corresponding relation is determined according to the brightness uniformity data of described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve.
In conjunction with the third feasible embodiment of first aspect, in the 4th kind of feasible embodiment, after the brightness uniformity data of described basis described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve determine described first corresponding relation, described method also comprises:
Described first corresponding relation is stored in look-up table LUT.
In conjunction with the embodiment that the second of first aspect is feasible, in the 5th kind of feasible embodiment, at least two sub regions described in described Real-time Obtaining each sub regions grey decision-making before, described GTG control method also comprises:
Obtain described LCDs GTG-brightness curve and under described specific backlight drive electric current the brightness uniformity data of described each sub regions;
Described GTG-brightness curve is divided at least two GTG intervals according to slope;
Described second corresponding relation is determined according to the brightness uniformity data of described each sub regions under described specific backlight drive electric current and described GTG-brightness curve.
Embodiment of the present invention second aspect discloses a kind of GTG control device, and described GTG control device comprises:
First divides module, for the territory, effective display area of LCDs is divided at least two sub regions;
According to the grey decision-making obtained, first acquisition module, for the grey decision-making of sub regions each at least two sub regions described in Real-time Obtaining, and determines that the GTG at the described current place of each sub regions is interval;
Compensating module, the grey decision-making of corresponding relation to described each sub regions for backlight drive electric current that is interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset, GTG between interval and gray scale compensation value compensates respectively.
In conjunction with second aspect, in the embodiment that the first is feasible, under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in multiple backlight drive electric current, the first corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
Described compensating module, specifically for:
When the backlight mode of described LCDs is content-adaptive backlight control CABC pattern, compensate respectively according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions grey decision-making of the first corresponding relation to described each sub regions that be interval and that preset.
In conjunction with second aspect, in the embodiment that the second is feasible, under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in specific backlight drive electric current, the second corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
Described compensating module, comprising:
Determining unit, for when the backlight mode of described LCDs is not content-adaptive backlight control CABC pattern, determines that the backlight drive electric current of described LCDs is described specific backlight drive electric current;
Compensating unit, compensates respectively for and the grey decision-making of the second corresponding relation to described each sub regions interval according to the GTG at the described current place of each sub regions.
In conjunction with the first feasible embodiment of second aspect, in the embodiment that the third is feasible, described GTG control device also comprises:
Second acquisition module, for obtain described LCDs GTG-brightness curve and under described multiple backlight drive electric current the brightness uniformity data of described each sub regions;
Second divides module, for described GTG-brightness curve is divided at least two GTG intervals according to slope;
First determination module, for determining described first corresponding relation according to the brightness uniformity data of described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve.
In conjunction with the third feasible embodiment of second aspect, in the 4th kind of feasible embodiment, described GTG control device also comprises:
Memory module, for storing described first corresponding relation with look-up table LUT.
In conjunction with the embodiment that the second of second aspect is feasible, in the 5th kind of feasible embodiment, described GTG control device also comprises:
3rd acquisition module, for obtain described LCDs GTG-brightness curve and under described specific backlight drive electric current the brightness uniformity data of described each sub regions;
3rd divides module, for described GTG-brightness curve is divided at least two GTG intervals according to slope;
Second determination module, for determining described second corresponding relation according to the brightness uniformity data of described each sub regions under described specific backlight drive electric current and described GTG-brightness curve.
The embodiment of the present invention third aspect provides a kind of LCDs, and described LCDs can comprise backlight, backlight drive circuit, liquid crystal layer and the GTG control device according to any one of first to the 5th kind of feasible embodiment of embodiment of the present invention second aspect and second aspect.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; The grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained; The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset backlight drive electric current, GTG compensates respectively, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of an embodiment of the GTG control method that the embodiment of the present invention provides;
Fig. 2 is the sub-zone dividing schematic diagram in territory, effective display area in the GTG control method that provides of the embodiment of the present invention;
Fig. 3 is the schematic flow sheet of another embodiment of the GTG control method that the embodiment of the present invention provides;
Fig. 4 is the schematic flow sheet of the another embodiment of the GTG control method that the embodiment of the present invention provides;
Fig. 5 is the structural representation of an embodiment of the GTG control device that the embodiment of the present invention provides;
Fig. 6 is the structural representation of another embodiment of the GTG control device that the embodiment of the present invention provides;
Fig. 7 is the structural representation of the another embodiment of the GTG control device that the embodiment of the present invention provides;
Fig. 8 is the structural representation of an embodiment of the LCDs that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of GTG control method, GTG control device and LCDs, can improve the homogeneity of LCDs, be described in detail below in conjunction with accompanying drawing to embodiments of the invention.
See Fig. 1, the schematic flow sheet of an embodiment of the GTG control method provided for the embodiment of the present invention, as shown in Figure 1, described GTG control method can comprise the steps:
S101, is divided at least two sub regions by the territory, effective display area of LCDs.
In concrete enforcement, the territory, effective display area of described LCDs is the region that can be used for showing image in LCDs.
In the embodiment that some are feasible, the sub-zone dividing effect in the territory, effective display area of LCDs can be as shown in Figure 2.In concrete enforcement, divide by the territory, effective display area of register parameters to LCDs, such as: the 1st to M the pixel arranging 1 to N-th row is the pixel in subregion 1, and wherein N and M is the integer being greater than 1.
S102, the grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained.
Particularly, described Real-time Obtaining realizes by just performing once acquisition action at interval of shorter a period of time, such as: the time execution refreshing a frame or a few two field picture every LCDs once obtains action, or once obtains action every 50ms execution.
Alternatively, the grey decision-making of each sub regions can be the grey decision-making mean value that uniform sampling obtains from the pixel of each sub regions, or the average of the grey decision-making of all pixels in all subregion, or the grey decision-making average etc. of some pixels in centre position in each sub regions.Grey decision-making wherein described in the embodiment of the present invention, can be the magnitude of voltage of the gray scale voltage controlling liquid crystal deflection, also can be the luma data that the data drive circuit of LCDs inputs to each pixel.
In the embodiment that some are feasible, in advance GTG-the brightness curve of LCDs can be divided into multiple interval, alternatively, can divide according to horizontal ordinate (grey decision-making), or divide according to ordinate (brightness), or divide according to slope.
In the embodiment of the present invention, GTG-brightness curve refers to the relation curve between the grey decision-making of pixel in liquid crystal display and brightness, is also called gamma (Gamma) curve.For liquid crystal display, when backlight luminosity is constant, the brightness through liquid crystal is not directly proportional between the gray scale voltage controlling liquid crystal deflection, but there is a kind of distortion, and gamma curve is exactly the metric parameter of this distortion.
S103, the grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset backlight drive electric current, GTG compensates respectively.
In concrete enforcement, the corresponding relation between the interval and gray scale compensation value of backlight drive electric current, GTG can be pre-set, when needing to compensate the grey decision-making of LCDs, determine the compensation rate to all subregion according to the GTG interval at the current grey decision-making place of this corresponding relation and the current backlight drive circuit of LCDs, all subregion, more respectively the grey decision-making of all subregion is compensated according to the compensation rate determined.Wherein, the gray scale voltage into adjusting all subregion is compensated to the grey decision-making of all subregion, thus the deflection angle of the liquid crystal layer of adjustment all subregion and transmittance, the brightness of final adjustment all subregion.
Particularly, relevant with the brightness uniformity data of all subregion to the compensation of the grey decision-making of all subregion, such as: under a certain backlight drive electric current, the offset of the subregion that brightness is higher is lower than the offset of the lower subregion of brightness, to make difference between the brightness of final all subregion less, thus improve the brightness uniformity of LCDs.
In the embodiment that some are feasible, LCDs can adopt CABC (ContentAdaptiveBrightnessControl, content-adaptive backlight control) backlight mode, namely the backlight drive electric current of LCDs can adjust according to the picture material of display, and the luminosity of backlight is variable quantity.Now, the corresponding relation between the backlight drive electric current preset, GTG interval and gray scale compensation value can be under multiple backlight drive electric current, and corresponding relation between the GTG interval of described each sub regions and gray scale compensation value, can be described as the first corresponding relation.In concrete enforcement, the first corresponding relation can obtain according to the brightness uniformity test data of LCDs all subregion under multiple backlight drive electric current.
In the embodiment that some are feasible, LCDs does not adopt CABC backlight mode, and namely the backlight drive electric current of LCDs is fixed value, not along with the picture material change of display.Now, can determine that the backlight drive electric current of LCDs is a specific backlight drive electric current, corresponding relation between the backlight drive electric current then preset, GTG interval and gray scale compensation value can be under this specific backlight drive electric current, corresponding relation between the GTG interval of described each sub regions and gray scale compensation value, can be described as the second corresponding relation.
In concrete enforcement, the second corresponding relation can obtain according to the brightness uniformity test data of LCDs all subregion under described specific backlight drive electric current.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; The grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained; The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset backlight drive electric current, GTG compensates respectively, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
See Fig. 3, the schematic flow sheet of another embodiment of the GTG control method provided for the embodiment of the present invention, as shown in Figure 3, described GTG control method can comprise the steps:
S301, is divided at least two sub regions by the territory, effective display area of LCDs.
In the embodiment that some are feasible, the embodiment of step S301 with reference to the step S101 of Fig. 1-2 illustrated embodiment, can be not repeated herein.
S302, if the backlight mode of described LCDs is CABC pattern, then obtain described LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of described each sub regions.
In the embodiment of the present invention, GTG-brightness curve refers to the relation curve between the grey decision-making of pixel in liquid crystal display and brightness, is also called gamma (Gamma) curve.For liquid crystal display, when backlight luminosity is constant, the brightness through liquid crystal is not directly proportional between the gray scale voltage controlling liquid crystal deflection, but there is a kind of distortion, and gamma curve is exactly the metric parameter of this distortion.Wherein, above-mentioned GTG-brightness curve can be provided by the supplier of display panels.
In the embodiment of the present invention, LCDs adopts CABC backlight mode, and namely the backlight drive electric current of LCDs can adjust according to the picture material of display, and the luminosity of backlight is variable quantity.Now, can obtain LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of each sub regions.In the embodiment that some are feasible, above-mentioned brightness uniformity data can be provided by the supplier of display panels.
In the embodiment that some are feasible, the brightness uniformity data of described all subregion can be the brightness of all subregion in the territory, effective display area of LCDs and the ratio of the brightness with reference to subregion, wherein reference subregion can be the subregion that in territory, effective display area, brightness is the highest, or in territory, effective display area, be positioned at middle subregion, or the subregion etc. that in territory, effective display area, brightness is placed in the middle, the embodiment of the present invention does not limit the selection with reference to subregion.
S303, is divided at least two GTG intervals by described GTG-brightness curve according to slope.
After obtaining the GTG-brightness curve of LCDs, at least two GTG intervals can be divided into, in the embodiment of the present invention, according to the slope of GTG-brightness curve, it be divided.
S304, the first corresponding relation is determined according to the brightness uniformity data of described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve, described first corresponding relation is under described multiple backlight drive electric current, the corresponding relation between the GTG interval of described each sub regions and gray scale compensation value.
In the embodiment of the present invention, LCDs adopts CABC backlight mode, and namely the backlight drive electric current of LCDs can adjust according to the picture material of display, and the luminosity of backlight is variable quantity.Now the compensation of the grey decision-making of all subregion be should be taken into account to the change of the backlight drive electric current of LCDs, then can according to the brightness uniformity data of each sub regions described under multiple backlight drive electric current and the GTG-brightness curve of LCDs, determine the gray scale compensation value to all subregion when different backlight drive electric current and different GTG interval, thus obtain described first corresponding relation.
Particularly, the compensation principle of the embodiment of the present invention to the grey decision-making of all subregion is: according to the ratio of the offset of the brightness uniformity data determination all subregion of all subregion, under same backlight drive electric current, the offset that the lower subregion of brightness obtains is larger, to make difference between the brightness of final all subregion less, thus improve the brightness uniformity of LCDs.Wherein the concrete size of offset is then relevant with the GTG interval at all subregion place with the backlight drive electric current of LCDs.
In the embodiment that some are feasible, described first corresponding relation can be stored in look-up table (Look-upTable, LUT).
S305, the grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained.
In the embodiment that some are feasible, the embodiment of step S305 with reference to step S102 embodiment illustrated in fig. 1, can be not repeated herein.
S306, compensates respectively according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions grey decision-making of the first corresponding relation to described each sub regions that be interval and that preset.
After determining the first corresponding relation, GTG interval according to the current backlight drive electric current of the first corresponding relation, LCDs, the current place of all subregion can determine the offset that all subregion is deserved respectively, compensate to make difference between the brightness of final all subregion less to the grey decision-making of corresponding subregion respectively according to the offset of all subregion determined again, thus improve the brightness uniformity of LCDs.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; When the backlight mode of LCDs is CABC pattern, obtain LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of each sub regions; GTG-brightness curve is divided at least two GTG intervals according to slope; The first corresponding relation is determined according to the brightness uniformity data of each sub regions under multiple backlight drive electric current and GTG-brightness curve; The grey decision-making of each sub regions in Real-time Obtaining at least two sub regions, and determine that the GTG at the current place of each sub regions is interval according to the grey decision-making obtained; Compensate respectively according to the GTG at the current backlight drive electric current of LCDs, the current place of each sub regions grey decision-making of the first corresponding relation to each sub regions that be interval and that preset, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
See Fig. 4, the schematic flow sheet of the another embodiment of the GTG control method provided for the embodiment of the present invention, as shown in Figure 4, described GTG control method can comprise the steps:
S401, is divided at least two sub regions by the territory, effective display area of LCDs.
In the embodiment that some are feasible, the embodiment of step S401 with reference to the step S101 of Fig. 1-2 illustrated embodiment, can be not repeated herein.
S402, if the backlight mode of described LCDs is not CABC pattern, then determines that the backlight drive electric current of described LCDs is described specific backlight drive electric current.
In the embodiment of the present invention, LCDs does not adopt CABC backlight mode, and namely the backlight drive electric current of LCDs is fixed value, not along with the picture material change of display.Now, can determine that the backlight drive electric current of LCDs is a specific backlight drive electric current.
S403, obtain described LCDs GTG-brightness curve and under described specific backlight drive electric current the brightness uniformity data of described each sub regions.
In the embodiment of the present invention, GTG-brightness curve refers to the relation curve between the grey decision-making of pixel in liquid crystal display and brightness, is also called gamma (Gamma) curve.For liquid crystal display, when backlight luminosity is constant, the brightness through liquid crystal is not directly proportional between the gray scale voltage controlling liquid crystal deflection, but there is a kind of distortion, and gamma curve is exactly the metric parameter of this distortion.Wherein, above-mentioned GTG-brightness curve can be provided by the supplier of display panels.
In the embodiment of the present invention, determine that the backlight drive electric current of LCDs is after a specific backlight drive electric current, can obtain LCDs GTG-brightness curve and under this specific backlight drive electric current the brightness uniformity data of each sub regions.In the embodiment that some are feasible, above-mentioned brightness uniformity data can be provided by the supplier of display panels.
In the embodiment that some are feasible, the brightness uniformity data of described all subregion can be the brightness of all subregion in the territory, effective display area of LCDs and the ratio of the brightness with reference to subregion, wherein reference subregion can be the subregion that in territory, effective display area, brightness is the highest, or in territory, effective display area, be positioned at middle subregion, or the subregion etc. that in territory, effective display area, brightness is placed in the middle, the embodiment of the present invention does not limit the selection with reference to subregion.
S404, is divided at least two GTG intervals by described GTG-brightness curve according to slope.
After obtaining the GTG-brightness curve of LCDs, at least two GTG intervals can be divided into, in the embodiment of the present invention, according to the slope of GTG-brightness curve, it be divided.
S405, described second corresponding relation is determined according to the brightness uniformity data of described each sub regions under described specific backlight drive electric current and described GTG-brightness curve, described second corresponding relation is under described specific backlight drive electric current, the corresponding relation between the GTG interval of described each sub regions and gray scale compensation value.
In the embodiment of the present invention, LCDs does not adopt CABC backlight mode, and namely the backlight drive electric current of LCDs is a specific backlight drive electric current.Now can according to the brightness uniformity data of described each sub regions and the GTG-brightness curve of LCDs under this specific backlight drive electric current, determine the gray scale compensation value to all subregion when this specific backlight drive electric current and different GTG interval, thus obtain described second corresponding relation.
Particularly, the compensation principle of the embodiment of the present invention to the grey decision-making of all subregion is: according to the ratio of the offset of the brightness uniformity data determination all subregion of all subregion, under this specific backlight drive electric current, the offset that the lower subregion of brightness obtains is larger, to make difference between the brightness of final all subregion less, thus improve the brightness uniformity of LCDs.Wherein then the size of backlight drive electric current specific for this is relevant with the GTG interval at all subregion place for the concrete size of offset.
S406, the grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained.
In the embodiment that some are feasible, the embodiment of step S406 with reference to step S102 embodiment illustrated in fig. 1, can be not repeated herein.
S407, according to the GTG at the described current place of each sub regions, the interval and grey decision-making of the second corresponding relation to described each sub regions compensates respectively.
After determining the second corresponding relation, GTG interval according to the second corresponding relation and the current place of all subregion can determine the offset that all subregion is deserved respectively, compensate to make difference between the brightness of final all subregion less to the grey decision-making of corresponding subregion respectively according to the offset of all subregion determined again, thus improve the brightness uniformity of LCDs.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; When the backlight mode of LCDs is not CABC pattern, determine that the backlight drive electric current of LCDs is specific backlight drive electric current; Obtain LCDs GTG-brightness curve and under specific backlight drive electric current the brightness uniformity data of each sub regions; GTG-brightness curve is divided at least two GTG intervals according to slope; The second corresponding relation is determined according to the brightness uniformity data of each sub regions under specific backlight drive electric current and GTG-brightness curve; The grey decision-making of each sub regions in Real-time Obtaining at least two sub regions, and determine that the GTG at the current place of each sub regions is interval according to the grey decision-making obtained; According to the GTG at the current place of each sub regions, the interval and grey decision-making of the second corresponding relation to each sub regions compensates respectively, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
See Fig. 5, the structural representation of an embodiment of the GTG control device provided for the embodiment of the present invention, as shown in Figure 5, described GTG control device can comprise the first division module 501, first acquisition module 502 and compensating module 503, wherein:
First divides module 501, for the territory, effective display area of LCDs is divided at least two sub regions.
In concrete enforcement, the territory, effective display area of described LCDs is the region that can be used for showing image in LCDs.
In the embodiment that some are feasible, the sub-zone dividing effect in the territory, effective display area of LCDs can be as shown in Figure 2.In concrete enforcement, divide by the territory, effective display area of register parameters to LCDs, such as: the 1st to M the pixel arranging 1 to N-th row is the pixel in subregion 1, and wherein N and M is the integer being greater than 1.
According to the grey decision-making obtained, first acquisition module 502, for the grey decision-making of sub regions each at least two sub regions described in Real-time Obtaining, and determines that the GTG at the described current place of each sub regions is interval.
Particularly, described Real-time Obtaining realizes by just performing once acquisition action at interval of shorter a period of time, such as: the time execution refreshing a frame or a few two field picture every LCDs once obtains action, or once obtains action every 50ms execution.
Alternatively, the grey decision-making of each sub regions can be the grey decision-making mean value that uniform sampling obtains from the pixel of each sub regions, or the average of the grey decision-making of all pixels in all subregion, or the grey decision-making average etc. of some pixels in centre position in each sub regions.Grey decision-making wherein described in the embodiment of the present invention, can be the magnitude of voltage of the gray scale voltage controlling liquid crystal deflection, also can be the luma data that the data drive circuit of LCDs inputs to each pixel.
In the embodiment that some are feasible, in advance GTG-the brightness curve of LCDs can be divided into multiple interval, alternatively, can divide according to horizontal ordinate (grey decision-making), or divide according to ordinate (brightness), or divide according to slope.
In the embodiment of the present invention, GTG-brightness curve refers to the relation curve between the grey decision-making of pixel in liquid crystal display and brightness, is also called gamma (Gamma) curve.For liquid crystal display, when backlight luminosity is constant, the brightness through liquid crystal is not directly proportional between the gray scale voltage controlling liquid crystal deflection, but there is a kind of distortion, and gamma curve is exactly the metric parameter of this distortion.
Compensating module 503, the grey decision-making of corresponding relation to described each sub regions for backlight drive electric current that is interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset, GTG between interval and gray scale compensation value compensates respectively.
In concrete enforcement, the corresponding relation between the interval and gray scale compensation value of backlight drive electric current, GTG can be pre-set, when needing to compensate the grey decision-making of LCDs, determine the compensation rate to all subregion according to the GTG interval at the current grey decision-making place of this corresponding relation and the current backlight drive circuit of LCDs, all subregion, more respectively the grey decision-making of all subregion is compensated according to the compensation rate determined.Wherein, the gray scale voltage into adjusting all subregion is compensated to the grey decision-making of all subregion, thus the deflection angle of the liquid crystal layer of adjustment all subregion and transmittance, the brightness of final adjustment all subregion.
Particularly, relevant with the brightness uniformity data of all subregion to the compensation of the grey decision-making of all subregion, such as: under a certain backlight drive electric current, the offset of the subregion that brightness is higher is lower than the offset of the lower subregion of brightness, to make difference between the brightness of final all subregion less, thus improve the brightness uniformity of LCDs.
In the embodiment that some are feasible, LCDs can adopt CABC (ContentAdaptiveBrightnessControl, content-adaptive backlight control) backlight mode, namely the backlight drive electric current of LCDs can adjust according to the picture material of display, and the luminosity of backlight is variable quantity.Now, the corresponding relation between the backlight drive electric current preset, GTG interval and gray scale compensation value can be under multiple backlight drive electric current, and corresponding relation between the GTG interval of described each sub regions and gray scale compensation value, can be described as the first corresponding relation.In concrete enforcement, the first corresponding relation can obtain according to the brightness uniformity test data of LCDs all subregion under multiple backlight drive electric current.
In the embodiment that some are feasible, LCDs does not adopt CABC backlight mode, and namely the backlight drive electric current of LCDs is fixed value, not along with the picture material change of display.Now, can determine that the backlight drive electric current of LCDs is a specific backlight drive electric current, corresponding relation between the backlight drive electric current then preset, GTG interval and gray scale compensation value can be under this specific backlight drive electric current, corresponding relation between the GTG interval of described each sub regions and gray scale compensation value, can be described as the second corresponding relation.
In concrete enforcement, the second corresponding relation can obtain according to the brightness uniformity test data of LCDs all subregion under described specific backlight drive electric current.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; The grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained; The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset backlight drive electric current, GTG compensates respectively, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
See Fig. 6, the structural representation of another embodiment of the GTG control device provided for the embodiment of the present invention, as shown in Figure 6, described GTG control device can comprise the first division module 601, second acquisition module 602, second and divide module 603, first determination module 604, memory module 605, first acquisition module 606 and compensating module 607, wherein:
First divides module 601, for the territory, effective display area of LCDs is divided at least two sub regions.
In the embodiment that some are feasible, the embodiment that first of the present embodiment divides module 601 with reference to the associated description of the embodiment illustrated in fig. 5 first division module 501, can be not repeated herein.
Second acquisition module 602, for obtain described LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of described each sub regions.
In the embodiment of the present invention, GTG-brightness curve refers to the relation curve between the grey decision-making of pixel in liquid crystal display and brightness, is also called gamma (Gamma) curve.For liquid crystal display, when backlight luminosity is constant, the brightness through liquid crystal is not directly proportional between the gray scale voltage controlling liquid crystal deflection, but there is a kind of distortion, and gamma curve is exactly the metric parameter of this distortion.Wherein, above-mentioned GTG-brightness curve can be provided by the supplier of display panels.
In the embodiment that some are feasible, second acquisition module 602 can specifically for when LCDs adopts CABC backlight mode, obtain described LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of described each sub regions.
In the present embodiment, LCDs adopts CABC backlight mode, and namely the backlight drive electric current of LCDs can adjust according to the picture material of display, and the luminosity of backlight is variable quantity.Now, can obtain LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of each sub regions.In the embodiment that some are feasible, above-mentioned brightness uniformity data can be provided by the supplier of display panels.
In the embodiment that some are feasible, the brightness uniformity data of described all subregion can be the brightness of all subregion in the territory, effective display area of LCDs and the ratio of the brightness with reference to subregion, wherein reference subregion can be the subregion that in territory, effective display area, brightness is the highest, or in territory, effective display area, be positioned at middle subregion, or the subregion etc. that in territory, effective display area, brightness is placed in the middle, the embodiment of the present invention does not limit the selection with reference to subregion.
Second divides module 603, for described GTG-brightness curve is divided at least two GTG intervals according to slope.
After obtaining the GTG-brightness curve of LCDs, second divides module 603 can be divided at least two GTG intervals, and in the embodiment of the present invention, second divides module 603 divides it according to the slope of GTG-brightness curve.
First determination module 604, for determining described first corresponding relation according to the brightness uniformity data of described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve.
In the embodiment of the present invention, the first corresponding relation is under above-mentioned multiple backlight drive electric current, the corresponding relation between the GTG interval of each sub regions and gray scale compensation value.
In the embodiment of the present invention, LCDs adopts CABC backlight mode, and namely the backlight drive electric current of LCDs can adjust according to the picture material of display, and the luminosity of backlight is variable quantity.Now the compensation of the grey decision-making of all subregion be should be taken into account to the change of the backlight drive electric current of LCDs, then can according to the brightness uniformity data of each sub regions described under multiple backlight drive electric current and the GTG-brightness curve of LCDs, determine the gray scale compensation value to all subregion when different backlight drive electric current and different GTG interval, thus obtain described first corresponding relation.
Particularly, the compensation principle of the embodiment of the present invention to the grey decision-making of all subregion is: according to the ratio of the offset of the brightness uniformity data determination all subregion of all subregion, under same backlight drive electric current, the offset that the lower subregion of brightness obtains is larger, to make difference between the brightness of final all subregion less, thus improve the brightness uniformity of LCDs.Wherein the concrete size of offset is then relevant with the GTG interval at all subregion place with the backlight drive electric current of LCDs.
Memory module 605, for storing described first corresponding relation with look-up table LUT.
In the embodiment that some are feasible, described first corresponding relation can be stored in look-up table (Look-upTable, LUT) by memory module 605.
According to the grey decision-making obtained, first acquisition module 606, for the grey decision-making of sub regions each at least two sub regions described in Real-time Obtaining, and determines that the GTG at the described current place of each sub regions is interval.
In the embodiment that some are feasible, the embodiment of the first acquisition module 606 with reference to the associated description of the first acquisition module 502 embodiment illustrated in fig. 5, can be not repeated herein.
Compensating module 607, the grey decision-making of corresponding relation to described each sub regions for backlight drive electric current that is interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset, GTG between interval and gray scale compensation value compensates respectively.
In the present embodiment, under the corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in multiple backlight drive electric current, the first corresponding relation between the GTG interval of described each sub regions and gray scale compensation value.Now described compensating module 607, can be specifically for: when the backlight mode of described LCDs is content-adaptive backlight control CABC pattern, the GTG grey decision-making of the first corresponding relation to described each sub regions that be interval and that preset according to the current backlight drive electric current of described LCDs, the described current place of each sub regions compensates respectively.
After determining the first corresponding relation, GTG interval according to the current backlight drive electric current of the first corresponding relation, LCDs, the current place of all subregion can determine the offset that all subregion is deserved respectively, compensate to make difference between the brightness of final all subregion less to the grey decision-making of corresponding subregion respectively according to the offset of all subregion determined again, thus improve the brightness uniformity of LCDs.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; When the backlight mode of LCDs is CABC pattern, obtain LCDs GTG-brightness curve and under multiple backlight drive electric current the brightness uniformity data of each sub regions; GTG-brightness curve is divided at least two GTG intervals according to slope; The first corresponding relation is determined according to the brightness uniformity data of each sub regions under multiple backlight drive electric current and GTG-brightness curve; The grey decision-making of each sub regions in Real-time Obtaining at least two sub regions, and determine that the GTG at the current place of each sub regions is interval according to the grey decision-making obtained; Compensate respectively according to the GTG at the current backlight drive electric current of LCDs, the current place of each sub regions grey decision-making of the first corresponding relation to each sub regions that be interval and that preset, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
See Fig. 7, the structural representation of the another embodiment of the GTG control device provided for the embodiment of the present invention, as shown in Figure 7, described GTG control device can comprise the first division module 701, the 3rd acquisition module 702, the 3rd divides module 703, second determination module 704, first acquisition module 705 and compensating module 706, wherein:
First divides module 701, for the territory, effective display area of LCDs is divided at least two sub regions.
In the embodiment that some are feasible, the embodiment that first of the present embodiment divides module 701 with reference to the associated description of the embodiment illustrated in fig. 5 first division module 501, can be not repeated herein.
3rd acquisition module 702, for obtain described LCDs GTG-brightness curve and under specific backlight drive electric current the brightness uniformity data of described each sub regions.
In the embodiment of the present invention, GTG-brightness curve refers to the relation curve between the grey decision-making of pixel in liquid crystal display and brightness, is also called gamma (Gamma) curve.For liquid crystal display, when backlight luminosity is constant, the brightness through liquid crystal is not directly proportional between the gray scale voltage controlling liquid crystal deflection, but there is a kind of distortion, and gamma curve is exactly the metric parameter of this distortion.Wherein, above-mentioned GTG-brightness curve can be provided by the supplier of display panels.
In the embodiment of the present invention, LCDs does not adopt CABC backlight mode, determine that the backlight drive electric current of LCDs is after a specific backlight drive electric current, can obtain LCDs GTG-brightness curve and under this specific backlight drive electric current the brightness uniformity data of each sub regions.In the embodiment that some are feasible, above-mentioned brightness uniformity data can be provided by the supplier of display panels.
In the embodiment that some are feasible, the brightness uniformity data of described all subregion can be the brightness of all subregion in the territory, effective display area of LCDs and the ratio of the brightness with reference to subregion, wherein reference subregion can be the subregion that in territory, effective display area, brightness is the highest, or in territory, effective display area, be positioned at middle subregion, or the subregion etc. that in territory, effective display area, brightness is placed in the middle, the embodiment of the present invention does not limit the selection with reference to subregion.
3rd divides module 703, for described GTG-brightness curve is divided at least two GTG intervals according to slope.
After obtaining the GTG-brightness curve of LCDs, the 3rd divides module 703 can be divided at least two GTG intervals, in the embodiment of the present invention, can divide according to the slope of GTG-brightness curve to it.
Second determination module 704, for determining the second corresponding relation according to the brightness uniformity data of described each sub regions under described specific backlight drive electric current and described GTG-brightness curve.
In the embodiment of the present invention, the second corresponding relation is under described specific backlight drive electric current, the corresponding relation between the GTG interval of each sub regions and gray scale compensation value.
In the embodiment of the present invention, LCDs does not adopt CABC backlight mode, and namely the backlight drive electric current of LCDs is a specific backlight drive electric current.Now can according to the brightness uniformity data of described each sub regions and the GTG-brightness curve of LCDs under this specific backlight drive electric current, determine the gray scale compensation value to all subregion when this specific backlight drive electric current and different GTG interval, thus obtain described second corresponding relation.
Particularly, the compensation principle of the embodiment of the present invention to the grey decision-making of all subregion is: according to the ratio of the offset of the brightness uniformity data determination all subregion of all subregion, under this specific backlight drive electric current, the offset that the lower subregion of brightness obtains is larger, to make difference between the brightness of final all subregion less, thus improve the brightness uniformity of LCDs.Wherein then the size of backlight drive electric current specific for this is relevant with the GTG interval at all subregion place for the concrete size of offset.
According to the grey decision-making obtained, first acquisition module 705, for the grey decision-making of sub regions each at least two sub regions described in Real-time Obtaining, and determines that the GTG at the described current place of each sub regions is interval.
In the embodiment that some are feasible, the embodiment of the first acquisition module 705 with reference to the associated description of the first acquisition module 502 embodiment illustrated in fig. 5, can be not repeated herein.
Compensating module 706, the grey decision-making of corresponding relation to described each sub regions for backlight drive electric current that is interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset, GTG between interval and gray scale compensation value compensates respectively.
In the present embodiment, under the corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in specific backlight drive electric current, the second corresponding relation between the GTG interval of described each sub regions and gray scale compensation value.Now described compensating module 706, can comprise determining unit 7061 and compensating unit 7062, wherein:
Determining unit 7061, for when the backlight mode of described LCDs is not content-adaptive backlight control CABC pattern, determines that the backlight drive electric current of described LCDs is described specific backlight drive electric current.
In the embodiment of the present invention, LCDs does not adopt CABC backlight mode, and namely the backlight drive electric current of LCDs is fixed value, not along with the picture material change of display.Now, determining unit can determine that the backlight drive electric current of LCDs is a specific backlight drive electric current.
Compensating unit 7062, compensates respectively for and the grey decision-making of the second corresponding relation to described each sub regions interval according to the GTG at the described current place of each sub regions.
After determining the second corresponding relation, GTG interval according to the second corresponding relation and the current place of all subregion can determine the offset that all subregion is deserved respectively, compensate to make difference between the brightness of final all subregion less to the grey decision-making of corresponding subregion respectively according to the offset of all subregion determined again, thus improve the brightness uniformity of LCDs.
In the embodiment of the present invention, the territory, effective display area of LCDs is divided at least two sub regions; When the backlight mode of LCDs is not CABC pattern, determine that the backlight drive electric current of LCDs is specific backlight drive electric current; Obtain LCDs GTG-brightness curve and under specific backlight drive electric current the brightness uniformity data of each sub regions; GTG-brightness curve is divided at least two GTG intervals according to slope; The second corresponding relation is determined according to the brightness uniformity data of each sub regions under specific backlight drive electric current and GTG-brightness curve; The grey decision-making of each sub regions in Real-time Obtaining at least two sub regions, and determine that the GTG at the current place of each sub regions is interval according to the grey decision-making obtained; According to the GTG at the current place of each sub regions, the interval and grey decision-making of the second corresponding relation to each sub regions compensates respectively, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
See Fig. 8, the structural representation of an embodiment of the LCDs provided for the embodiment of the present invention.As shown in Figure 8, described LCDs can comprise backlight 801, backlight drive circuit 802, liquid crystal layer 803 and GTG control device 804.
Particularly, the GTG control device of the present embodiment is the GTG control device such as described by Fig. 5 to Fig. 7 any embodiment, and its concrete structure and function with reference to the associated description of figure 5 to Fig. 7, can be not repeated herein.
In concrete enforcement, liquid crystal layer 803 can be positioned at the top of backlight 801, and backlight drive circuit 902 is connected with backlight 801, can be used for exporting the backlight drive electric current needed for backlight 801 luminescence.GTG control device 804 is connected with liquid crystal layer 803, can compensate the grey decision-making of liquid crystal layer, namely adjusts the deflection angle of the liquid crystal molecule that each pixel is corresponding in liquid crystal layer, thus the light transmission rate of adjustment liquid crystal layer.
According to the associated description of Fig. 5 to Fig. 7, the LCDs of the embodiment of the present invention can compensate respectively to the grey decision-making of sub regions each in territory, effective display area, the subregion making brightness higher obtains less compensation, the lower subregion of brightness obtains larger compensation, thus improves the brightness uniformity of LCDs.
Module in all embodiments of the present invention or unit, universal integrated circuit can be passed through, such as CPU (CentralProcessingUnit, central processing unit), or realized by ASIC (ApplicationSpecificIntegratedCircuit, special IC).
Step in embodiment of the present invention method can be carried out order according to actual needs and be adjusted, merges and delete.
Unit in embodiment of the present invention device can carry out merging, divide and deleting according to actual needs.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (13)
1. a GTG control method, is characterized in that, described GTG control method comprises:
The territory, effective display area of LCDs is divided at least two sub regions;
The grey decision-making of each sub regions at least two sub regions described in Real-time Obtaining, and determine that the GTG at the described current place of each sub regions is interval according to the grey decision-making obtained;
The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset backlight drive electric current, GTG compensates respectively.
2. GTG control method according to claim 1, is characterized in that,
Under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in multiple backlight drive electric current, the first corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of the GTG at the described backlight drive electric current current according to described LCDs, the described current place of each sub regions interval and that preset backlight drive electric current, GTG compensates respectively, is specially:
If the backlight mode of described LCDs is content-adaptive backlight control CABC pattern, then compensate respectively according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions grey decision-making of the first corresponding relation to described each sub regions that be interval and that preset.
3. GTG control method according to claim 1, is characterized in that,
Under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in specific backlight drive electric current, the second corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
The grey decision-making of corresponding relation to described each sub regions between the interval and gray scale compensation value of the GTG at the described backlight drive electric current current according to described LCDs, the described current place of each sub regions interval and that preset backlight drive electric current, GTG compensates respectively, comprising:
If the backlight mode of described LCDs is not CABC pattern, then determine that the backlight drive electric current of described LCDs is described specific backlight drive electric current;
According to the GTG at the described current place of each sub regions, the interval and grey decision-making of the second corresponding relation to described each sub regions compensates respectively.
4. GTG control method according to claim 2, is characterized in that, at least two sub regions described in described Real-time Obtaining each sub regions grey decision-making before, described GTG control method also comprises:
Obtain described LCDs GTG-brightness curve and under described multiple backlight drive electric current the brightness uniformity data of described each sub regions;
Described GTG-brightness curve is divided at least two GTG intervals according to slope;
Described first corresponding relation is determined according to the brightness uniformity data of described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve.
5. method according to claim 4, it is characterized in that, after the brightness uniformity data of described basis described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve determine described first corresponding relation, described method also comprises:
Described first corresponding relation is stored in look-up table LUT.
6. GTG control method according to claim 3, is characterized in that, at least two sub regions described in described Real-time Obtaining each sub regions grey decision-making before, described GTG control method also comprises:
Obtain described LCDs GTG-brightness curve and under described specific backlight drive electric current the brightness uniformity data of described each sub regions;
Described GTG-brightness curve is divided at least two GTG intervals according to slope;
Described second corresponding relation is determined according to the brightness uniformity data of described each sub regions under described specific backlight drive electric current and described GTG-brightness curve.
7. a GTG control device, is characterized in that, described GTG control device comprises:
First divides module, for the territory, effective display area of LCDs is divided at least two sub regions;
According to the grey decision-making obtained, first acquisition module, for the grey decision-making of sub regions each at least two sub regions described in Real-time Obtaining, and determines that the GTG at the described current place of each sub regions is interval;
Compensating module, the grey decision-making of corresponding relation to described each sub regions for backlight drive electric current that is interval according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions and that preset, GTG between interval and gray scale compensation value compensates respectively.
8. GTG control device according to claim 7, is characterized in that,
Under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in multiple backlight drive electric current, the first corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
Described compensating module, specifically for:
When the backlight mode of described LCDs is content-adaptive backlight control CABC pattern, compensate respectively according to the GTG at the current backlight drive electric current of described LCDs, the described current place of each sub regions grey decision-making of the first corresponding relation to described each sub regions that be interval and that preset.
9. GTG control device according to claim 7, is characterized in that,
Under corresponding relation between described default backlight drive electric current, GTG interval and gray scale compensation value is included in specific backlight drive electric current, the second corresponding relation between the GTG interval of described each sub regions and gray scale compensation value;
Described compensating module, comprising:
Determining unit, for when the backlight mode of described LCDs is not content-adaptive backlight control CABC pattern, determines that the backlight drive electric current of described LCDs is described specific backlight drive electric current;
Compensating unit, compensates respectively for and the grey decision-making of the second corresponding relation to described each sub regions interval according to the GTG at the described current place of each sub regions.
10. GTG control device according to claim 8, is characterized in that, described GTG control device also comprises:
Second acquisition module, for obtain described LCDs GTG-brightness curve and under described multiple backlight drive electric current the brightness uniformity data of described each sub regions;
Second divides module, for described GTG-brightness curve is divided at least two GTG intervals according to slope;
First determination module, for determining described first corresponding relation according to the brightness uniformity data of described each sub regions under described multiple backlight drive electric current and described GTG-brightness curve.
11. GTG control device according to claim 10, is characterized in that, described GTG control device also comprises:
Memory module, for storing described first corresponding relation with look-up table LUT.
12. GTG control device according to claim 9, is characterized in that, described GTG control device also comprises:
3rd acquisition module, for obtain described LCDs GTG-brightness curve and under described specific backlight drive electric current the brightness uniformity data of described each sub regions;
3rd divides module, for described GTG-brightness curve is divided at least two GTG intervals according to slope;
Second determination module, for determining described second corresponding relation according to the brightness uniformity data of described each sub regions under described specific backlight drive electric current and described GTG-brightness curve.
13. 1 kinds of LCDs, is characterized in that, described LCDs comprises backlight, backlight drive circuit, liquid crystal layer and the GTG control device as described in any one of claim 7 to 12.
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