CN101950543A - Dynamic backlight adjustment method and device - Google Patents
Dynamic backlight adjustment method and device Download PDFInfo
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- CN101950543A CN101950543A CN 201010280006 CN201010280006A CN101950543A CN 101950543 A CN101950543 A CN 101950543A CN 201010280006 CN201010280006 CN 201010280006 CN 201010280006 A CN201010280006 A CN 201010280006A CN 101950543 A CN101950543 A CN 101950543A
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Abstract
The invention provides dynamic backlight adjustment method and device. The dynamic backlight adjustment device comprises a liquid crystal panel, a backlight source, an image detection unit, a sampling and calculating unit and a backlight adjustment unit, wherein the image detection unit is connected with the liquid crystal panel and used for acquiring panel penetration rates of all preset areas on the liquid crystal panel when a current frame is displayed; the sampling and calculating unit is connected with the image detection unit and used for determining backlight regulation proportions corresponding to the panel penetration rates of all the preset areas according to a corresponding relation between a plurality of preset panel penetration rate intervals and a plurality of backlight regulation proportions; and the backlight adjustment unit is connected with the sampling and calculating unit and used for generating backlight control signals according to the backlight regulation proportions and reducing brightness of the backlight source corresponding to the preset areas to a brightness corresponding to the backlight regulation proportions. The invention realizes the inhomogeneous regulation of the backlight, and not only achieves the purposes of high efficiency and energy saving, but also can greatly improve the contrast ratio of images.
Description
Technical field
The present invention relates to display device and driving circuit, more specifically, relate to a kind of dynamic backlight method of adjustment and device.
Background technology
Along with the attention degree of countries in the world to low-power consumption, energy-conserving product improves day by day, and flat panel TV and display stand in the breach for requirements of saving energy as electronic product main in the daily life.Now flat panel TV is entering in everybody daily life with very fast speed and is going, and along with the raising of consumer's appreciation level, also improves day by day for the requirement of high-quality and low-power consumption.Liquid crystal (LCD, Liquid Crystal Display) display has characteristics such as extra long life, power saving, low operating voltage, high color rendering index (CRI), low-temperature operation, reaction velocity are fast, environmental protection, and therefore, display panels is becoming the main flow of flat panel TV.But display panels is a kind of passive luminescent device, therefore, just backlight need be set in LCD.
LCD is when operate as normal, if all images are shown with same back light source brightness, can make the backlight power consumption higher, cause the shortening in serviceable life backlight, because it is backlight that the power consumption major part of system comes from, can make the power consumption of total system also bigger simultaneously.And, the bright-dark degree of shown different pictures is different on the liquid crystal panel, the zones of different bright-dark degree of same picture also is different, and human eye is for the sensation of light and shade, brightness just is highstrung, if so show with same back light source brightness, the brightness of shown picture does not just have too big variation on the liquid crystal panel, the contrast of picture is also just lower.
Find in practice, regulative mode backlight of the prior art, reduce by whole back light source brightness mostly the LCD correspondence, and the method for adjusting image intensity is simultaneously adjusted the contrast of liquid crystal display displays image, image adjustment and adjusting backlight belong to independently processing procedure, the problem that can not regulate the brightness of the backlight of zones of different correspondence at the brightness requirement of the zones of different of same picture.
Summary of the invention
The present invention aims to provide a kind of dynamic backlight method of adjustment and device, and it can solve the problem that regulative mode backlight of the prior art can not be regulated the brightness of the backlight of zones of different correspondence at the brightness requirement of the zones of different of same picture.
On the one hand, a kind of dynamic backlight adjusting gear is provided, has comprised liquid crystal panel and backlight, this backlight regulation apparatus also comprises: image detecting element, be connected the panel penetrance of each presumptive area when being used to obtain the current frame image demonstration on the liquid crystal panel with liquid crystal panel; The sampling computing unit is connected with image detecting element, is used for determining the pairing adjusting ratio backlight of panel penetrance of each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight; Backlight adjusting unit is connected with the sampling computing unit, is used for according to adjusting ratio backlight generation backlight control signal, the brightness of the backlight of presumptive area correspondence is reduced to the brightness of the correspondence of adjusting ratio backlight.
On the other hand, provide a kind of dynamic backlight method of adjustment, having comprised: the panel penetrance of each presumptive area when image detecting element obtains the current frame image demonstration on the liquid crystal panel; The sampling computing unit is determined the pairing adjusting ratio backlight of panel penetrance of each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight; Backlight adjusting unit produces backlight control signal according to adjusting ratio backlight, the brightness of the backlight of presumptive area correspondence is reduced to the brightness of the correspondence of adjusting ratio backlight.
In the technique scheme, by utilizing the sampling computing unit according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight, determine the pairing adjusting ratio backlight of panel penetrance of each presumptive area, and backlight adjusting unit produces backlight control signal according to adjusting ratio backlight, the brightness of the backlight of presumptive area correspondence is reduced to the brightness of the correspondence of adjusting ratio backlight, penetrance according to the zones of different of same picture is determined adjusting ratio backlight, and adjust the brightness of corresponding backlight at zones of different, thereby can carry out different processing to the brightness of the backlight under the same picture, overcome the problem that regulative mode backlight of the prior art can not be regulated the brightness of the backlight of zones of different correspondence at the brightness requirement of the zones of different of same picture.
Should be appreciated that above stated specification of the present invention and following detailed, all is schematic and indicative, its objective is that to the invention provides further instruction all be for the present invention for required protection being provided further explanation.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:.
Fig. 1 shows the structural representation of dynamic backlight adjusting gear embodiment one of the present invention;
Fig. 2 shows the funtcional relationship synoptic diagram that the present invention determines adjusting proportion function backlight;
Fig. 3 shows the structural representation of dynamic backlight adjusting gear embodiment two of the present invention;
Fig. 4 shows the structural representation of dynamic backlight adjusting gear embodiment three of the present invention;
Fig. 5 shows the process flow diagram of dynamic backlight method of adjustment of the present invention;
Fig. 6 shows the funtcional relationship synoptic diagram of exponential function of the present invention; And
Fig. 7 shows the function relation figure of dynamic backlight method of adjustment of the present invention.
Embodiment
For clearly demonstrating method and apparatus of the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.
Describe the embodiment one of dynamic backlight adjusting gear of the present invention in detail below in conjunction with Fig. 1 and Fig. 2.
Fig. 1 shows the structural representation of dynamic backlight adjusting gear embodiment one of the present invention.As shown in Figure 1, the dynamic backlight adjusting gear comprises liquid crystal panel 1 and backlight 2, and this dynamic backlight adjusting gear also comprises: image detecting element 3, sampling computing unit 4 and backlight adjusting unit 5.
Wherein, backlight 2 has power circuit and a plurality of luminescence component, and image detecting element 3 is connected with liquid crystal panel 1, the panel penetrance of each presumptive area when being used to obtain the current frame image demonstration on the liquid crystal panel; Sampling computing unit 4 is connected with image detecting element 3, is used for determining the pairing adjusting ratio backlight of panel penetrance of each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight; Backlight adjusting unit 5 is connected with sampling computing unit 4, is used for according to adjusting ratio backlight generation backlight control signal, will be reduced to the corresponding brightness of adjusting ratio backlight with the brightness of the backlight 2 of presumptive area on the liquid crystal panel.Because to the adjustment of backlight 2 mainly is that the brightness of the luminescence component by adjusting backlight 2 realizes, thereby, to be reduced to the corresponding brightness of adjusting ratio backlight with the brightness of the backlight 2 of presumptive area on the liquid crystal panel, just the brightness of luminescence component corresponding with presumptive area on the liquid crystal panel on the backlight 2 will be reduced to the corresponding brightness of adjusting ratio backlight.
In the dynamic backlight adjusting gear of present embodiment, the panel penetrance of each presumptive area when image detecting element 3 detects current frame images and shows on the liquid crystal panel promptly detects the panel penetrance of each presumptive area on the pairing liquid crystal panel of current picture shown on the liquid crystal panel.The presumptive area area that sets is more little, and then the intensity of variation of shown image adjacent area contrast can be more little on the liquid crystal panel.As the pairing liquid crystal panel of the luminescence component that can be set to each backlight is presumptive area, and the pairing liquid crystal panel of luminescence component that a plurality of adjacent backlights also can be set is a presumptive area.
After the panel penetrance of each presumptive area when image detecting element 3 detects the current frame image demonstration on the liquid crystal panel, sampling computing unit 4 is determined the pairing adjusting ratio backlight of panel penetrance of each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight.A plurality of panel penetrances interval in the present embodiment is to be divided into M interval by the value with penetrance to obtain, and the occurrence of M can determine as required that the scope in each panel penetrance interval is as shown in table 1.
Table 1
And the corresponding relation in each adjusting ratio backlight and panel penetrance interval, it can be the interval corresponding adjusting ratio backlight of a panel penetrance, also can be the interval corresponding adjusting ratios backlight of a plurality of panel penetrances, and the occurrence of adjusting ratio backlight can be determined according to the pairing adjusting ratio of different panels penetrance in the prior art.
In the present embodiment, a plurality of panel penetrances corresponding relations interval and a plurality of adjusting ratios backlight are stored in the sampling computing unit 4 in advance, after the panel penetrance of each presumptive area when image detecting element 3 detects the current frame image demonstration on the liquid crystal panel, the panel penetrance of each presumptive area when current frame image is shown on the liquid crystal panel is sent to sampling computing unit 4, sampling computing unit 4 judges the panel penetrance of each presumptive area is in which zone in a plurality of presumptive areas, according to the relation of this zone and adjusting ratio backlight, find this area relative adjusting ratio backlight then.For example, when the panel penetrance of sampling computing unit 4 resulting one of them presumptive area is 1.5/M, then the sequence number in this panel penetrance corresponding tables 1 is 1 predetermined interval, and then the adjusting ratio backlight of this presumptive area correspondence be the interval
Corresponding adjusting ratio backlight.
In the present embodiment, for when improving contrast, improve grayscale transition problems of too between different pictures, adjusting ratio through type 1 backlight is determined.
Wherein, u represents different predetermined penetrance intervals, and y (u) is described adjusting ratio backlight, and M is the interval quantity in described predetermined penetrance interval, and a is the interval critical value of low-light level,
B is a critical value between high luminance area,
Open and, " [] " expression is to the data round numbers in " [] ", promptly in the present embodiment
It is right to represent
Round numbers.For example, if M=257, be about to penetration value and be divided into 257 intervals, and u represents different predetermined penetrance intervals, each predetermined penetrance corresponding sequence number in the table 1 just,
A=52, b=206.
Fig. 2 shows the funtcional relationship synoptic diagram that the present invention determines adjusting proportion function backlight, and as shown in Figure 2, horizontal ordinate is represented the number in a plurality of panel penetrances interval; And ordinate is represented the adjusting ratio, and promptly adjusted backlight illumination accounts for the number percent of original backlight illumination.
As can be seen from Figure 2, adjusting proportion function backlight is divided into three sections curves, first section curve, and promptly label is 0～a for the horizontal ordinate scope of the curve of " (1) " among Fig. 2; Second section curve, promptly label is that the horizontal ordinate scope of the curve of " (2) " is (a+1)～b among Fig. 2, the 3rd section curve, promptly label is that the horizontal ordinate scope of " (3) " is (a+1)～b among Fig. 2.By the physical significance of each parameter in the formula 1 as can be known, a is the interval critical value of low-light level, b is a critical value between high luminance area, and promptly the horizontal ordinate corresponding panel penetrance of the point on first section curve is lower, and the horizontal ordinate corresponding panel penetrance of the point on the 3rd section curve is higher.
After the pairing adjusting ratio backlight of each presumptive area, backlight adjusting unit 5 produces backlight control signal according to adjusting ratio backlight, and the brightness of the luminescence component of backlight 2 that will be corresponding with presumptive area on the liquid crystal panel is reduced to the corresponding brightness of adjusting ratio backlight.Particularly, according to the ordinate y (u) that through type 1 obtains, adjusting ratio value promptly backlight produces backlight control signal, and the brightness of the luminescence component of backlight 2 that will be corresponding with presumptive area on the liquid crystal panel is reduced to the corresponding brightness of adjusting ratio backlight.The process that will be reduced to the corresponding brightness of adjusting ratio backlight with the brightness of the luminescence component of presumptive area backlight 2 on the liquid crystal panel can send the power control circuit of backlight control signal to backlight 2 for: backlight adjusting unit joint unit, power control circuit is adjusted PWM (the Pulse Width Modulation of the luminescence component of each presumptive area correspondence according to the size of the signal value of backlight control signal, pulse-length modulation) dutycycle, thereby the realization modulation phase is answered the electric current of the luminescence component of fate, reach and to realize different brightness adjustment to the back light source brightness of different presumptive areas down same picture, make under the same picture different bright degree get the brightness difference of the backlight of corresponding region under the image, can improve the contrast of image greatly, play energy-efficient effect simultaneously, prolong the serviceable life of liquid crystal flat-panel TV.
In the present embodiment, by utilizing the sampling computing unit according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight, determine the pairing adjusting ratio backlight of panel penetrance of each presumptive area, and backlight adjusting unit produces backlight control signal according to adjusting ratio backlight, the brightness of backlight is reduced to the brightness of the correspondence of adjusting ratio backlight, penetrance according to the zones of different of same picture is determined adjusting ratio backlight, and adjust the brightness of corresponding backlight at zones of different, thereby can carry out different processing to back light source brightness under the same picture, can be when not influencing the raising picture contrast, play energy-efficient effect, overcome regulative mode backlight of the prior art can not carry out non-homogeneous processing at the brightness requirement of the zones of different of same picture to the brightness of the backlight of zones of different correspondence problem.And the process of adjustment backlight is to handle at each two field picture, and along with the variation of display image, backlight illumination is also in continuous variation, thereby this processing procedure is that the change dynamics along with display image changes.
In the present embodiment, be sent out back liquid crystal panel 1 through adjusted current frame image and show, though have certain time-delay when handling current frame image, should the time shorter, and therefore the processing time can not watch video to impact to the user less than the reaction time of human eye.
Below in conjunction with Fig. 3 dynamic backlight adjusting gear embodiment two of the present invention is described.
Fig. 3 shows the structural representation of dynamic backlight adjusting gear embodiment two of the present invention.As shown in Figure 3, the places different with embodiment two are, backlight regulation apparatus also comprises panel compensating unit 6, wherein, panel compensating unit 6 is connected with liquid crystal panel 1, be used to obtain the histogram information of the current frame image after the brightness regulation, and adjust according to the current frame image of histogram information after to brightness regulation.Adopt the structure in the present embodiment, on the basis of embodiment one, further the picture displaying contents is regulated, can reach and optimize the display image effect, strengthen picture contrast, the gradation of image distribution is complementary with human vision property.
In the present embodiment, current frame image after the brightness regulation adjusted further handle, and final adjusted current frame image is sent it back liquid crystal panel 1 show, though still have certain time-delay, but the time sum of this twice processing is also shorter, and therefore the processing time can not watch video to impact to the user less than the reaction time of human eye.
Below in conjunction with Fig. 4 dynamic backlight adjusting gear embodiment three of the present invention is described.
Fig. 4 shows the structural representation of dynamic backlight adjusting gear embodiment three of the present invention.As shown in Figure 4, the places different with embodiment two are that backlight regulation apparatus also comprises secondary optics unit 7, and secondary optics unit 7 is connected with liquid crystal panel 1, and panel compensating unit 6 is connected with secondary optics unit 7.
Wherein, secondary optics unit 7 is used to obtain the histogram information of the current frame image after the brightness regulation, and panel compensating unit 6 is used for adjusting according to the current frame image of histogram information after to brightness regulation.In the present embodiment just, adopt unit independently to obtain the histogram information of the current frame image after the brightness regulation, thereby make the processing speed of panel compensating unit 6 faster.
Each unit in the above-described embodiments can be finished by the chip with its function.Can select the data collecting card corresponding with the image acquisition frequency as image detecting element 3, sampling computing unit 4 can be selected general data processing chip, and backlight adjusting unit 5 then can adopt the general purpose control chip to realize.
In the above-described embodiments, a plurality of panel penetrances are interval also can be stored in the sampling computing unit 4 simultaneously with a plurality of adjusting ratios backlight, but in order to improve the processing speed of sampling computing unit, backlight regulation apparatus also comprises the storage unit that is connected with the sampling computing unit, stores the interval and a plurality of adjusting ratios backlight of a plurality of panel penetrances.
Describe dynamic backlight method of adjustment of the present invention in detail below in conjunction with Fig. 5.
Fig. 5 shows the process flow diagram of dynamic backlight method of adjustment of the present invention.As shown in Figure 5, the dynamic backlight method of adjustment comprises:
The panel penetrance of each presumptive area when S11, image detecting element obtain the current frame image demonstration on the liquid crystal panel.
Particularly, the panel penetrance of each presumptive area when image detecting element 3 shown in Fig. 1, Fig. 3 and Fig. 4 detects the current frame image demonstration on the liquid crystal panel, i.e. the panel penetrance of each presumptive area on the pairing liquid crystal panel of current picture shown on the liquid crystal panel.
S12, sampling computing unit determine the pairing adjusting ratio backlight of panel penetrance of each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight.
Particularly, after the panel penetrance of each presumptive area when image detecting element 3 detects the current frame image demonstration on the liquid crystal panel, sampling computing unit 4 is determined the pairing adjusting ratio backlight of panel penetrance of each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight.
The scope in concrete corresponding relation and each panel penetrance interval is existing in the embodiment one of dynamic backlight adjusting gear of the present invention to be introduced in detail, does not repeat them here.
S13, backlight adjusting unit produces backlight control signal according to adjusting ratio backlight, the brightness of the backlight of presumptive area correspondence is reduced to the brightness of the correspondence of adjusting ratio backlight.
After the pairing adjusting ratio backlight of each presumptive area, backlight adjusting unit 5 produces backlight control signal according to adjusting ratio backlight, and the brightness of the luminescence component of backlight 2 that will be corresponding with the presumptive area of liquid crystal panel 1 is reduced to the corresponding brightness of adjusting ratio backlight.Concrete adjustment process is existing in the embodiment one of dynamic backlight adjusting gear of the present invention to be introduced in detail, also repeats no more at this.
Similarly, in the present embodiment,, improve grayscale transition problems of too between different pictures, can determine adjusting ratio y backlight (u) according to formula 1, and the adjusting ratio y backlight (u) that through type 1 obtains produces backlight control signal for when improving contrast.
In the present embodiment, by utilizing the sampling computing unit according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight, determine the pairing adjusting ratio backlight of panel penetrance of each presumptive area, and backlight adjusting unit produces backlight control signal according to adjusting ratio backlight, to be reduced to the corresponding brightness of adjusting ratio backlight with the brightness of presumptive area backlight on the liquid crystal panel, penetrance according to the zones of different of same picture is determined adjusting ratio backlight, and adjust the brightness of corresponding backlight at zones of different, thereby can carry out different processing to back light source brightness under the same picture, overcome regulative mode backlight of the prior art can not carry out different disposal at the brightness requirement of the zones of different of same picture to the brightness of the backlight of zones of different correspondence problem.
In order further the picture displaying contents to be regulated, optimize the display image effect to reach, strengthen picture contrast, make the effect that gradation of image distributes and human vision property is complementary, the dynamic backlight method of adjustment also comprises:
Obtain the histogram information of the current frame image after the brightness regulation, and adjust according to the current frame image of histogram information after to brightness regulation.
Particularly, obtain the current frame image after the brightness regulation, and obtain the histogram of the adjusted image of brightness, this image is further adjusted, obtain the uniform new images of a width of cloth intensity profile, make the human eye perceives image not have tangible stereovision according to histogram information.The histogram transformation method mainly contains two kinds: linear transformation and nonlinear transformation.The method of image being regulated by histogram mainly is to change by the number of pixels of mapping relations with each GTG value correspondence in the original image.Adjust by panel compensating unit 6 according to the current frame image of histogram information after and to finish, and histogrammic obtaining both can be finished by panel compensating unit 6, also can be finished by secondary optics unit 7 brightness regulation.
In the present embodiment, mainly adopt non-linear transform function that image is adjusted.
A kind of adjustment mode is by g (x)=b
C (x-a)-1 pair of adjusted image of back light source brightness is adjusted, and concrete set-up procedure is as follows:
Calculate the conversion number of pixels of each GTG value correspondence, wherein, a, b, c are pre-determined factor, and x is the number of pixels of each the GTG value correspondence in the histogram of the current frame image after the brightness regulation;
The number of pixels of each the GTG value correspondence in the histogram of the adjusted current frame image of brightness is adjusted into each GTG value conversion number of pixels.
Wherein, exponential function g (x)=b
C (x-a)-1 funtcional relationship synoptic diagram as shown in Figure 6, horizontal ordinate among the figure is represented the pixel quantity of different GTG correspondences, the pixel quantity of the GTG correspondence after ordinate is represented to change, a, b, c are used for adjusting the position and the shape of curve, the value of a, b, c can be determined by empirical value, perhaps determine according to the needs of image adjustment.As can be seen from Figure 6, this function is to high luminance area, and promptly the high gray value gives bigger stretching.
Another kind of adjustment mode be by
The adjusted image of back light source brightness is adjusted, and concrete set-up procedure is as follows:
By
Calculate the conversion number of pixels of each GTG value correspondence, wherein, a, b, c are pre-determined factor, and x is the number of pixels of each the GTG value correspondence in the histogram of the current frame image after the brightness regulation.
The number of pixels of each the GTG value correspondence in the histogram of the current frame image after the brightness regulation is adjusted into each GTG value conversion number of pixels.
Wherein, exponential function
The funtcional relationship synoptic diagram as shown in Figure 7, horizontal ordinate among the figure is represented the pixel quantity of different GTG correspondences equally, the pixel quantity of the GTG correspondence after ordinate is represented to change equally, a, b, c are used for adjusting the position and the shape of curve, the value of a, b, c can be determined by empirical value, can determine according to the needs of image adjustment.As can be seen from Figure 7, this function can be to the low-light level district of image, and promptly low GTG value is carried out bigger stretching.
Two functions that use in these two kinds of adjustment modes are adjusted the emphasis difference of image, can select according to the adjustment demand in use.
From the above description as can be seen, the above embodiment of the present invention has realized following technique effect:
By utilizing the sampling computing unit according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight, determine the pairing adjusting ratio backlight of panel penetrance of each presumptive area, and backlight adjusting unit produces backlight control signal according to adjusting ratio backlight, the brightness of backlight is reduced to the brightness of the correspondence of adjusting ratio backlight, penetrance according to the zones of different of same picture is determined adjusting ratio backlight, and adjust the brightness of corresponding backlight at zones of different, thereby can carry out different processing to the back light source brightness under the same picture, realized non-homogeneousization adjusting backlight, not only reach energy-efficient purpose, and can improve the contrast of image greatly, overcome the problem that regulative mode backlight of the prior art can not be regulated the brightness of the backlight of zones of different correspondence at the brightness requirement of the zones of different of same picture.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a dynamic backlight adjusting gear comprises liquid crystal panel and backlight, it is characterized in that, described backlight regulation apparatus also comprises:
Image detecting element is connected with described liquid crystal panel, the panel penetrance of each presumptive area when being used to obtain the current frame image demonstration on the described liquid crystal panel;
The sampling computing unit is connected with described image detecting element, is used for determining the pairing adjusting ratio backlight of panel penetrance of described each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight;
Backlight adjusting unit is connected with described sampling computing unit, is used for producing backlight control signal according to described adjusting ratio backlight, the brightness of the backlight of described presumptive area correspondence is reduced to the brightness of the correspondence of described adjusting ratio backlight.
2. dynamic backlight adjusting gear according to claim 1 is characterized in that, determines adjusting ratio backlight by following formula:
Wherein, u represents different predetermined penetrance intervals, and y (u) is described adjusting ratio backlight, and M is the interval quantity in described predetermined penetrance interval, and a is the interval critical value of low-light level,
B is a critical value between high luminance area,
3. dynamic backlight adjusting gear according to claim 2, it is characterized in that, described backlight regulation apparatus also comprises the panel compensating unit, wherein, described panel compensating unit is connected with described liquid crystal panel, be used to obtain the histogram information of the described current frame image after the brightness regulation, and adjust according to the described current frame image of described histogram information after to brightness regulation.
4. dynamic backlight adjusting gear according to claim 3, it is characterized in that described backlight regulation apparatus also comprises the secondary optics unit, wherein, described secondary optics unit is connected with described liquid crystal panel, is used to obtain the histogram information of the described current frame image after the brightness regulation; Described panel compensating unit is connected with described secondary optics unit, is used for adjusting according to the described current frame image of described histogram information after to brightness regulation.
5. according to each described dynamic backlight adjusting gear in the claim 1 to 4, it is characterized in that, described backlight regulation apparatus also comprises storage unit, is connected with described sampling computing unit, is used to store the interval and a plurality of adjusting ratios backlight of default a plurality of panel penetrances.
6. a dynamic backlight method of adjustment is characterized in that, comprising:
The panel penetrance of each presumptive area when image detecting element obtains the current frame image demonstration on the described liquid crystal panel;
The sampling computing unit is determined the pairing adjusting ratio backlight of panel penetrance of described each presumptive area according to default a plurality of panel penetrances interval and the corresponding relation between a plurality of adjusting ratios backlight;
Produce backlight control signal according to described adjusting ratio backlight, the brightness of the backlight of described presumptive area correspondence is reduced to the brightness of the correspondence of described adjusting ratio backlight.
7. dynamic backlight method of adjustment according to claim 6 is characterized in that, determines adjusting ratio backlight by following formula:
Wherein, u represents different predetermined penetrance intervals, and y (u) is described adjusting ratio backlight, and M is the interval quantity in described predetermined penetrance interval, and a is the interval critical value of low-light level,
B is a critical value between high luminance area,
8. according to claim 6 or 7 described dynamic backlight methods of adjustment, it is characterized in that described dynamic backlight method of adjustment also comprises:
Obtain the histogram information of the described current frame image after the brightness regulation, and adjust according to the described current frame image of described histogram information after to brightness regulation.
9. dynamic backlight method of adjustment according to claim 8 is characterized in that, adjusts according to the described current frame image of described histogram information after to brightness regulation by following steps:
By g (x)=b
C (x-a)-1 calculates the conversion number of pixels of each GTG value correspondence, and wherein, a, b, c are pre-determined factor, and x is the number of pixels of each the GTG value correspondence in the histogram of the described current frame image after the brightness regulation;
The number of pixels of each the GTG value correspondence in the histogram of the described current frame image after the brightness regulation is adjusted into described each GTG value conversion number of pixels.
10. dynamic backlight method of adjustment according to claim 8 is characterized in that, adjusts according to the described current frame image of described histogram information after to brightness regulation by following steps:
By
Calculate the conversion number of pixels of each GTG value correspondence, wherein, a, b, c are pre-determined factor, and x is the number of pixels of each the GTG value correspondence in the histogram of the described current frame image after the brightness regulation;
The number of pixels of each the GTG value correspondence in the histogram of the described current frame image after the brightness regulation is adjusted into described each GTG value conversion number of pixels.
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| CN102495496A (en) * | 2011-11-11 | 2012-06-13 | 中航华东光电有限公司 | Screening device for screening non-uniformity of backlight source and testing method of screening device |
| TWI449028B (en) * | 2012-06-04 | 2014-08-11 | Ind Tech Res Inst | Self-luminescent display apparatus, adaptive screen control method, and adaptive adjusting circuit |
| CN104157262A (en) * | 2014-08-08 | 2014-11-19 | 深圳市华星光电技术有限公司 | Method of improving brightness uniformity of 3D liquid crystal display in case of 3D display and system |
| CN104766569A (en) * | 2015-04-29 | 2015-07-08 | 深圳市华星光电技术有限公司 | Screen dynamic backlight adjusting method |
| WO2016101391A1 (en) * | 2014-12-22 | 2016-06-30 | 深圳市华星光电技术有限公司 | Method for improving brightness uniformity of liquid crystal module |
| WO2019148665A1 (en) * | 2018-01-30 | 2019-08-08 | 武汉华星光电技术有限公司 | Liquid crystal display |
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