CN102427517A - Dynamic contrast adjustment method, dynamic contrast adjustment device and liquid crystal display television - Google Patents
Dynamic contrast adjustment method, dynamic contrast adjustment device and liquid crystal display television Download PDFInfo
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- CN102427517A CN102427517A CN2011102946349A CN201110294634A CN102427517A CN 102427517 A CN102427517 A CN 102427517A CN 2011102946349 A CN2011102946349 A CN 2011102946349A CN 201110294634 A CN201110294634 A CN 201110294634A CN 102427517 A CN102427517 A CN 102427517A
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Abstract
The invention discloses a dynamic contrast adjustment method, a dynamic contrast adjustment device and a liquid crystal display television. The dynamic contrast adjustment method comprises the following steps of: dynamic gray scale adjustment: reading the gray scales of all pixels in a current frame image; and respectively comparing the gray scales of all pixels with a first preset gray scale and adjusting the gray scales of all pixels according to comparison results to obtain adjusted gray scales corresponding to the pixels; and dynamic gamma voltage adjustment: subdividing gray scale voltage corresponding to the pixels with the dynamic gray scales which are adjusted, so as to enable the orders of the gray scale voltage corresponding to the gray scales of the pixels to be the same as the orders of the gray scale voltage corresponding to the gray scales of the pixels with the dynamic gray scales which are not adjusted; and outputting the subdivided multiple gamma voltage.
Description
Technical field
The present invention relates to technical field of liquid crystal display, relate in particular to a kind of dynamic contrast method of adjustment and device, liquid crystal TV set.
Background technology
Picture contrast refer in the piece image in the light and shade zone the brightest in vain and the darkest black between the measurement of different brightness levels, reacted the size of piece image gray scale contrast.Gamma (GAMMA) voltage refers to the node voltage of display image pixel gray level.Display voltage in the LCD is divided into two kinds of polarity, and one is positive polarity, and another is a negative polarity.When the voltage of show electrode is higher than the common electrode voltage, just be referred to as positive polarity, when the voltage of show electrode is lower than the voltage of common electrode, just be referred to as negative polarity..No matter be positive polarity or negative polarity, the GTG of one group of same brightness can be arranged all.Generally speaking, image divides 14 road GAMMA voltages, and GAMMA1 is to the corresponding positive polarity GTG of GAMMA7 voltage, and GAMMA8 is to the corresponding negative polarity GTG of GAMMA14 voltage.In general, choosing all of GAMMA voltage is fixed up, and that is to say that its gray scale voltage is fixed for a certain fixed gray level, so its color that shows is just abundant inadequately aspect demonstration.The display mode of this fixed gray level traditionally can not change the GAMMA voltage of pixel according to the bright-dark degree of image, exists the single shortcoming of contrast.
Summary of the invention
To the problems referred to above, the present invention provides a kind of gamma voltage that can adjust pixel according to the bright-dark degree of image dynamically, realizing dynamically adjusting the method and the device of picture contrast, and the liquid crystal TV set that includes said dynamic contrast adjusting device.
For achieving the above object, the method for adjustment of dynamic contrast of the present invention comprises the steps:
The dynamic gray level adjustment:
Read the GTG of all pixels in the current frame image;
The GTG and the first preset GTG with each pixel compares respectively, and according to comparative result the GTG of each pixel adjusted, and draws through the pairing GTG of adjusted each pixel; And,
The adjustment of dynamic gamma voltage:
To segment through the pairing gray scale voltage of the adjusted pixel of dynamic gray level, the exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level;
The a plurality of gamma voltages of output after segmentation.
For achieving the above object, dynamic contrast adjusting device of the present invention comprises:
The GTG read module, the GTG and the output of reading all pixels in the current frame image;
The GTG adjusting module receives the GTG of each pixel of said GTG read module output, the GTG and the first preset GTG of each pixel that receives is compared, and according to comparative result the GTG of each pixel is carried out dynamic data adjustment; And,
Dynamic gamma voltage generation module; To segment through the pairing gray scale voltage of the adjusted pixel of said GTG adjusting module; The exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level, a plurality of gamma voltages of output output after segmenting.
For achieving the above object, liquid crystal TV set of the present invention comprises above-mentioned dynamic contrast adjusting device.
The invention has the beneficial effects as follows:
The present invention is at first through improving the contrast of image to the dynamic data adjustment of each pixel gray level in the image, the losing of the partial pixel GTG that causes with the dynamic data adjustment of avoiding because of GTG through the adjustment of dynamic gamma voltage then.In other words, the present invention is that the gamma voltage that dynamic adjustment is exported is to highlight the black of the different depths when institute's images displayed integral body is dark; On the contrary, when institute's images displayed integral body was bright partially, then dynamically the gamma voltage of adjustment output was to highlight the white of the different depths, so that image shows more exquisiteness, stereovision is stronger, and contrast is higher.
Description of drawings
Fig. 1 is the flow chart of a specific embodiment of dynamic contrast method of adjustment according to the invention;
Fig. 2 is the function curve diagram of the specific embodiment followed of dynamic data according to the invention adjustment;
Fig. 3 is the structural representation of a specific embodiment of dynamic contrast adjusting device according to the invention;
Fig. 4 is the circuit block diagram of driving liquid crystal screen in the prior art;
Fig. 5 is the circuit block diagram that adopts the driving liquid crystal screen of dynamic contrast adjusting device according to the invention.
Embodiment
Below in conjunction with Figure of description the present invention is done further description.
As shown in Figure 1, the method for adjustment of dynamic contrast of the present invention comprises the steps:
The dynamic gray level adjustment:
Read the GTG of all pixels in the current frame image;
The GTG and the first preset GTG with each pixel compares respectively, and according to comparative result the GTG of each pixel adjusted, and draws through the pairing GTG of adjusted each pixel; And,
The adjustment of dynamic gamma voltage:
To segment through the pairing gray scale voltage of the adjusted pixel of dynamic gray level, the exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level;
The a plurality of gamma voltages of output after segmentation.
As the present invention embodiment further, in the foregoing description, describedly respectively the GTG and the first preset GTG of each pixel compared, and the GTG of each pixel is carried out the dynamic data adjustment according to comparative result; This step comprises:
Confirm the first preset GTG;
The GTG and the first preset GTG of pixel are compared, draw comparative result;
If comparative result is: the GTG of pixel is then heightened the GTG of this pixel between the first preset GTG and maximum gray;
If comparative result is: the GTG of pixel is then turned down the GTG of this pixel between the minimum gray and the first preset GTG; Wherein, maximum gray is the maximum gray that display device can provide, and minimum gray is the minimum gray that display device can provide.For example, the maximum gray of 8bit display device is 255, and minimum gray is 0; The maximum gray of 6bit display device is 63, and minimum gray is 0.The first preset GTG value can be the median between maximum gray and the minimum gray, also can be any set point value (this set point value can be selected according to experience) between maximum gray and the minimum gray.After above-mentioned dynamic data adjustment, low GTG pixel is raised in the image, and the high gray pixel is turned down, and then has increased the contrast of image, has improved the display effect of image.
Further, the respectively GTG of each pixel and the first preset GTG are compared described in the foregoing description, and the GTG of each pixel is carried out the dynamic data adjustment according to comparative result; This step also comprises:
Calculate the average GTG of said all pixels of image;
Judge that whether said average GTG is greater than the second preset GTG; Be that this image is high bright image; Otherwise this image is low bright image;
Then describedly respectively the GTG of each pixel and the first preset GTG are compared, and according to comparative result the GTG of each pixel is carried out the dynamic data adjustment, this step further comprises:
If said image is high bright image, in this image GTG be in amplitude that the GTG of the pixel between minimum gray and the first preset GTG turns down be higher than GTG in this image be in first preset the pixel between GTG and the maximum gray the amplitude heightened of GTG;
If said image is low bright image, in this image GTG be in amplitude that the GTG of the pixel between minimum gray and the first preset GTG turns down be lower than GTG in this image be in first preset the pixel between GTG and the maximum gray the amplitude heightened of GTG.Its actual purpose of step of above-mentioned dynamic data adjustment is: when a sub-picture integral body darker; The pixel of low GTG is many; The amplitude of turning down that the GTG increase rate of high gray data is higher than low luma data through data adjustment meeting; Thereby improved integral image brightness, increased the contrast of image; On the contrary, if a sub-picture integral body is brighter, the high gray pixel is many; The amplitude that to hang down the luma data reduction through the data adjustment is higher than the amplitude that high gray improves; Deepen the black that low GTG pixel shows, not only increased the contrast of image, also effectively improved the display effect of image.
Among above-mentioned each embodiment; The described first preset GTG equals the said second preset GTG; Promptly the second preset GTG also can be the median between maximum gray and the minimum gray, or any set point value (this set point value can be selected according to experience) between maximum gray and the minimum gray.
The amplitude that the GTG of each pixel is heightened or reduced among the present invention can be regulated according to preset function, and this function can be expressed as: O=f (I); Wherein, I is the GTG of pixel before the dynamic data adjustment; O is that pixel is through the adjusted GTG of dynamic data.Pixel gray level is heightened or reduced the adjustment function f () of amplitude can be according to the debug process of reality, find out through continuous debugging only, the functional rule of best results.
Fig. 2 is the function curve diagram that the present invention's dynamic data according to the invention is adjusted a specific embodiment of being followed.The data GTG of the transverse axis representative input of this curve, the data GTG of longitudinal axis representative output, through the gray scale curve of dynamic data adjustment, its output GTG does not equal to import GTG in straight line 1 representative; Curve 2 is through the adjusted gray scale curve of data.As can be seen from the figure, the GTG that hangs down its output of luma data through gamma compensation back can be lower, and the GTG of high gray data output can be higher; If that is to say when bright dark clearly demarcated GTG is arranged in the sub-picture; Can dark picture be become darker through the data adjustment, bright picture becomes brighter, thereby adds the poor of light dark picture; Realized increasing the effect of contrast, thereby made image level distincter.But the dynamic data adjustment has a weak point to be like this, and after the data adjustment, pixel gray level has to be lost, thereby clear inadequately expressively fine and smooth on image detail.Therefore need dynamic GAMMA voltage adjustment of the present invention, on the basis of dynamic data, GTG GAMMA voltage is adjusted, thereby each pixel gray level voltage can be different, the level that shows can be distincter.
For example: originally be input as the pixel data of 17 GTGs, the pairing gray scale voltage of this 17 GTG can tell 0,1, the gray scale voltage of a 2......17 different layers.Through after the dynamic data adjustment, become and be output as 6 GTG pixel datas, so, will lose the mid portion pixel gray level if do not carry out the adjustment of GAMMA voltage this moment.Its reason is: the gray scale voltage layer that the pairing gray scale voltage of 6 GTGs can be told has only 0,1,2......6; Lacked 11 layers gray scale voltage during so just than 17 GTGs; If the pairing gray scale voltage of 6 GTGs is not adjusted refinement; 11 layers gray scale voltage in the middle of will losing makes image thicken, stereovision a little less than.Therefore need through the adjustment of GAMMA voltage, the gray scale voltage that 6 GTGs are corresponding be subdivided into 17 GTGs the number of plies of corresponding gray scale voltage.The gray scale voltage that is about to 6 GTGs is divided into 17 layers.Preferably, the pairing gray scale voltage of said 6 GTGs is divided into 17 layers by the magnitude of voltage such as grade.Corresponding each the GTG pixel voltage in adjustment back just can not become, and the pairing GAMMA voltage of GTG of each pixel that image shows just can not lost yet, and the color that shows is just more bright-coloured.Even if images displayed is whole when dark like this, through can demonstrating the black of the different depths after the adjustment of dynamic gamma voltage, when the integral body of images displayed is brighter, through demonstrating the white of the different depths after the gamma voltage adjustment.
In sum, dynamically GAMMA voltage can be selected different GAMMA voltage according to the content (bright-dark degree) of image, so as far as pictures different, its contrast will be different, thereby realizes the function of dynamic contrast.
As shown in Figure 3, dynamic contrast adjusting device of the present invention comprises:
GTG read module 3, the GTG and the output of reading all pixels in the current frame image;
Dynamic gamma voltage generation module 5; To segment through the pairing gray scale voltage of the adjusted pixel of said GTG adjusting module; The exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level, a plurality of gamma voltages of output after segmentation.
As the present invention embodiment further, in the foregoing description, described GTG adjusting module 4 comprises: GTG comparison sub-module and dynamic data adjustment submodule; Wherein,
Said GTG comparison sub-module, the GTG and the first preset GTG with each pixel compares respectively, and the output comparative result;
Said dynamic data adjustment submodule receives the comparative result that said GTG comparison sub-module is exported, and according to comparative result the GTG of each pixel is heightened or is turned down.
As the present invention embodiment further, the dynamic gamma voltage generation module 5 described in the foregoing description comprises: gray scale voltage segmentation module and gamma voltage generation submodule, wherein,
Said gray scale voltage segmentation module; To segment through the pairing gray scale voltage of the adjusted pixel of said GTG adjusting module, the exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level;
Said gamma voltage generates submodule, according to the segmentation result of said gray scale voltage segmentation module output, generates and a plurality of gamma voltages of output after segmentation.
Liquid crystal TV set of the present invention comprises the dynamic contrast adjusting device described in above-mentioned any embodiment.Certainly; As shown in Figure 5; Described dynamic contrast adjusting device also can be integrated in the time schedule controller (ICON), and said like this dynamic contrast adjusting device just can be selected different GAMMA voltage according to the bright-dark degree of image, thereby corresponding each rank pixel has different gray levels voltage; Reach the image exquisiteness, the advantage of clear layer.The circuit block diagram of driving liquid crystal screen in the prior art shown in Figure 4; Datawire driver is inner can to segment out the corresponding gray scale voltage of each rank GTG through the mode of GAMMA resistance string dividing potential drop; The display mode of this fixed gray level traditionally can not change the GAMMA voltage of pixel according to the content (bright-dark degree) of image, exists the single shortcoming of contrast.
More than; Be merely preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claim was defined.
Claims (9)
1. the method for adjustment of a dynamic contrast is characterized in that, comprises the steps:
The dynamic gray level adjustment:
Read the GTG of all pixels in the current frame image;
The GTG and the first preset GTG with each pixel compares respectively, and according to comparative result the GTG of each pixel adjusted, and draws through the pairing GTG of adjusted each pixel; And,
The adjustment of dynamic gamma voltage:
To segment through the pairing gray scale voltage of the adjusted pixel of dynamic gray level, the exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level;
The a plurality of gamma voltages of output after segmentation.
2. the method for adjustment of dynamic contrast according to claim 1; It is characterized in that; Describedly respectively the GTG of each pixel and the first preset GTG are compared, and the GTG of each pixel is adjusted, draw through the pairing GTG of adjusted each pixel according to comparative result; This step comprises:
Confirm the first preset GTG;
The GTG and the said first preset GTG of pixel are compared, draw comparative result;
If comparative result is: the GTG of pixel is then heightened the GTG of this pixel between the first preset GTG and maximum gray;
If comparative result is: the GTG of pixel is then turned down the GTG of this pixel between the minimum gray and the first preset GTG;
Wherein, maximum gray is the maximum gray that display device can provide, and minimum gray is the minimum gray that display device can provide.
3. the method for adjustment of dynamic contrast according to claim 2 is characterized in that, describedly respectively the GTG of each pixel and the first preset GTG is compared, and according to comparative result the GTG of each pixel is carried out the dynamic data adjustment; This step also comprises:
Calculate the average GTG of said all pixels of image;
Judge that whether said average GTG is greater than the second preset GTG; Be that this image is high bright image; Otherwise this image is low bright image;
Then describedly respectively the GTG of each pixel and the first preset GTG are compared, and according to comparative result the GTG of each pixel is carried out the dynamic data adjustment, this step further comprises:
If said image is high bright image, in this image GTG be in amplitude that the GTG of the pixel between minimum gray and the first preset GTG turns down be higher than GTG in this image be in first preset the pixel between GTG and the maximum gray the amplitude heightened of GTG;
If said image is low bright image, in this image GTG be in amplitude that the GTG of the pixel between minimum gray and the first preset GTG turns down be lower than GTG in this image be in first preset the pixel between GTG and the maximum gray the amplitude heightened of GTG.
4. the method for adjustment of dynamic contrast according to claim 3 is characterized in that, the said first preset GTG equals the said second preset GTG.
5. the method for adjustment of dynamic contrast according to claim 1 is characterized in that, described will the segmentation through the pairing gray scale voltage of the adjusted pixel of dynamic gray level, and wherein, the method for said segmentation is specially: wait magnitude of voltage to divide equally.
6. a dynamic contrast adjusting device is characterized in that, comprising:
The GTG read module, the GTG and the output of reading all pixels in the current frame image;
The GTG adjusting module receives the GTG of each pixel of said GTG read module output, the GTG and the first preset GTG of each pixel that receives is compared, and according to comparative result the GTG of each pixel is carried out dynamic data adjustment; And,
Dynamic gamma voltage generation module; To segment through the pairing gray scale voltage of the adjusted pixel of said GTG adjusting module; The exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said GTG adjusting module, a plurality of gamma voltages of output after segmentation.
7. dynamic contrast adjusting device according to claim 6 is characterized in that, described GTG adjusting module comprises: GTG comparison sub-module and dynamic data adjustment submodule; Wherein,
Said GTG comparison sub-module, the GTG and the first preset GTG with each pixel compares respectively, and the output comparative result;
Said dynamic data adjustment submodule receives the comparative result that said GTG comparison sub-module is exported, and according to comparative result the GTG of each pixel is heightened or is turned down.
8. dynamic contrast adjusting device according to claim 6 is characterized in that, said dynamic gamma voltage generation module comprises: gray scale voltage segmentation module and gamma voltage generate submodule, wherein,
Said gray scale voltage segmentation module; To segment through the pairing gray scale voltage of the adjusted pixel of said GTG adjusting module, the exponent number at the pairing gray scale voltage of this pixel gray level place is identical when making the pairing gray scale voltage of this pixel gray level belong to exponent number and adjust without said dynamic gray level;
Said gamma voltage generates submodule, according to the segmentation result of said gray scale voltage segmentation module output, generates and a plurality of gamma voltages of output after segmentation.
9. a liquid crystal TV set is characterized in that, comprises like any one described dynamic contrast adjusting device in the claim 6 to 9.
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| WO2023098198A1 (en) * | 2021-12-03 | 2023-06-08 | 荣耀终端有限公司 | Method for adjusting driving voltage of display assembly, and terminal device |
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