CN102427517A - Dynamic contrast adjusting method and device and liquid crystal television - Google Patents
Dynamic contrast adjusting method and device and liquid crystal television Download PDFInfo
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Abstract
The invention discloses a method and a device for adjusting dynamic contrast and a liquid crystal television. The method for adjusting the dynamic contrast comprises the following steps: dynamic gray scale adjustment: reading the gray scales of all pixels in the current frame image; respectively comparing the gray scale of each pixel with a first preset gray scale, and adjusting the gray scale of each pixel according to the comparison result to obtain the adjusted gray scale corresponding to each pixel; and, dynamic gamma voltage adjustment: subdividing the gray scale voltage corresponding to the pixel after the dynamic gray scale adjustment to ensure that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale when the dynamic gray scale adjustment is not carried out; outputting the subdivided gamma voltages.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a dynamic contrast adjusting method and device and a liquid crystal television.
Background
Image contrast refers to the measurement of the different brightness levels between the brightest white and darkest black in the light and dark regions of an image, reflecting the magnitude of the gray contrast of an image. The GAMMA (GAMMA) voltage refers to a node voltage displaying a gray level of a pixel of an image. The display voltage in the liquid crystal display is divided into two polarities, one of which is a positive polarity and the other of which is a negative polarity. When the voltage of the display electrode is higher than the voltage of the common electrode, it is called a positive polarity, and when the voltage of the display electrode is lower than the voltage of the common electrode, it is called a negative polarity. Regardless of the positive or negative polarity, there is a set of gray levels of the same brightness. Generally, the image is divided into 14 paths of GAMMA voltages, GAMMA 1-GAMMA 7 voltages correspond to positive gray scales, and GAMMA 8-GAMMA 14 voltages correspond to negative gray scales. Generally, the GAMMA voltage is selected to be constant, that is, the gray level voltage is constant for a certain constant gray level, so that the displayed color is not rich enough in the aspect of display. The conventional display mode with fixed gray scale does not change the GAMMA voltage of the pixel according to the brightness of the image, and has the defect of single contrast.
Disclosure of Invention
In view of the above problems, the present invention provides a method and an apparatus for dynamically adjusting the contrast of an image by dynamically adjusting the gamma voltages of pixels according to the brightness of the image, and a liquid crystal television comprising the dynamic contrast adjusting apparatus.
In order to achieve the above object, the method for adjusting dynamic contrast of the present invention comprises the following steps:
dynamic gray scale adjustment:
reading the gray scales of all pixels in the current frame image;
respectively comparing the gray scale of each pixel with a first preset gray scale, and adjusting the gray scale of each pixel according to the comparison result to obtain the adjusted gray scale corresponding to each pixel; and the number of the first and second groups,
dynamic gamma voltage adjustment:
subdividing the gray scale voltage corresponding to the pixel after the dynamic gray scale adjustment to ensure that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale when the dynamic gray scale adjustment is not carried out;
outputting the subdivided gamma voltages.
In order to achieve the above object, the dynamic contrast adjusting apparatus according to the present invention includes:
the gray scale reading module reads and outputs the gray scales of all pixels in the current frame image;
the gray scale adjusting module is used for receiving the gray scale of each pixel output by the gray scale reading module, comparing the received gray scale of each pixel with a first preset gray scale and carrying out dynamic data adjustment on the gray scale of each pixel according to a comparison result; and the number of the first and second groups,
and the dynamic gamma voltage generation module is used for subdividing the gray scale voltage corresponding to the pixel adjusted by the gray scale adjustment module, so that the order of the gray scale voltage corresponding to the gray scale of the pixel is the same as the order of the gray scale voltage corresponding to the gray scale of the pixel when the dynamic gray scale adjustment is not carried out, and outputting a plurality of subdivided gamma voltages.
In order to achieve the above object, the lcd tv of the present invention includes the above dynamic contrast adjusting device.
The invention has the beneficial effects that:
the invention firstly improves the contrast ratio of the image by adjusting the dynamic data of each pixel gray scale in the image, and then avoids the loss of partial pixel gray scales caused by the adjustment of the dynamic data of the gray scales by adjusting the dynamic gamma voltage. In other words, the invention dynamically adjusts the output gamma voltage to highlight black with different shades when the displayed image is darker; on the contrary, when the displayed image is bright, the output gamma voltage is dynamically adjusted to highlight the white with different shades, so that the image display is more exquisite, the layering sense is stronger, and the contrast is higher.
Drawings
FIG. 1 is a flow chart of an embodiment of a dynamic contrast adjustment method according to the present invention;
FIG. 2 is a functional graph of one embodiment followed by the dynamic data adjustment of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of a dynamic contrast adjustment apparatus according to the present invention;
FIG. 4 is a block diagram of a prior art circuit for driving a liquid crystal display;
fig. 5 is a circuit block diagram of a driving liquid crystal display panel using the dynamic contrast adjusting apparatus according to the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1, the method for adjusting dynamic contrast according to the present invention includes the following steps:
dynamic gray scale adjustment:
reading the gray scales of all pixels in the current frame image;
respectively comparing the gray scale of each pixel with a first preset gray scale, and adjusting the gray scale of each pixel according to the comparison result to obtain the adjusted gray scale corresponding to each pixel; and the number of the first and second groups,
dynamic gamma voltage adjustment:
subdividing the gray scale voltage corresponding to the pixel after the dynamic gray scale adjustment to ensure that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale when the dynamic gray scale adjustment is not carried out;
outputting the subdivided gamma voltages.
As a further embodiment of the present invention, in the above embodiments, the gray scale of each pixel is compared with a first preset gray scale, and the dynamic data adjustment is performed on the gray scale of each pixel according to the comparison result; the method comprises the following steps:
determining a first preset gray scale;
comparing the gray scale of the pixel with a first preset gray scale to obtain a comparison result;
if the comparison result is: if the gray scale of the pixel is between the first preset gray scale and the maximum gray scale, the gray scale of the pixel is increased;
if the comparison result is: if the gray scale of the pixel is between the minimum gray scale and the first preset gray scale, the gray scale of the pixel is reduced; the maximum gray scale is the maximum gray scale provided by the display device, and the minimum gray scale is the minimum gray scale provided by the display device. For example, the maximum gray scale of an 8-bit display device is 255, and the minimum gray scale is 0; the maximum gray scale of the 6-bit display device is 63, and the minimum gray scale is 0. The first predetermined gray scale value may be an intermediate value between the maximum gray scale and the minimum gray scale, or may be any selected value between the maximum gray scale and the minimum gray scale (the selected value may be empirically selected). After the dynamic data adjustment, the low gray level pixels in the image are adjusted to be high, and the high gray level pixels in the image are adjusted to be low, so that the contrast of the image is increased, and the display effect of the image is improved.
Further, in the above embodiments, the gray scale of each pixel is compared with the first preset gray scale, and the dynamic data adjustment is performed on the gray scale of each pixel according to the comparison result; the steps further include:
calculating the average gray scale of all pixels of the image;
judging whether the average gray scale is larger than a second preset gray scale or not; if yes, the image is a highlight image; otherwise, the image is a low brightness image;
comparing the gray scale of each pixel with a first preset gray scale, and performing dynamic data adjustment on the gray scale of each pixel according to the comparison result, wherein the step further comprises:
if the image is a highlight image, the gray scale of the pixel with the gray scale between the minimum gray scale and the first preset gray scale in the image is turned down by a higher amplitude than the gray scale of the pixel with the gray scale between the first preset gray scale and the maximum gray scale in the image;
if the image is a low-brightness image, the gray scale of the pixel with the gray scale between the minimum gray scale and the first preset gray scale in the image is turned down by an amplitude lower than the gray scale of the pixel with the gray scale between the first preset gray scale and the maximum gray scale in the image. The actual purpose of the above dynamic data adjustment steps is: when an image is darker and has more pixels with low gray scale, the gray scale of the high gray scale data is increased by the data adjustment to be higher than the reduction amplitude of the low gray scale data, so that the overall brightness of the image is improved, and the contrast of the image is increased; on the contrary, if a pair of images is relatively bright and has more high gray-scale pixels, the reduction amplitude of the low gray-scale data is higher than the improvement amplitude of the high gray-scale data through data adjustment, so that the black displayed by the low gray-scale pixels is deepened, the contrast of the images is increased, and the display effect of the images is effectively improved.
In the above embodiments, the first predetermined gray level is equal to the second predetermined gray level, that is, the second predetermined gray level may be an intermediate value between the maximum gray level and the minimum gray level, or any selected value between the maximum gray level and the minimum gray level (the selected value may be empirically selected).
The gray scale of each pixel in the invention can be adjusted according to a preset function, and the function can be expressed as: o ═ f (i); wherein, I is the gray scale of the pixel before dynamic data adjustment; and O is the gray scale of the pixel after dynamic data adjustment. The adjusting function f () for increasing or decreasing the pixel gray scale can find out the most suitable function rule with the best effect through continuous debugging according to the actual debugging process.
FIG. 2 is a functional graph of an embodiment of the dynamic data adjustment of the present invention. The horizontal axis of the curve represents the input data gray scale, the vertical axis represents the output data gray scale, the straight line 1 represents the gray scale curve without dynamic data adjustment, and the output gray scale is equal to the input gray scale; curve 2 is the gray scale curve adjusted by the data. It can be seen from the figure that the gray scale output by the gamma-compensated low gray scale data is lower, and the gray scale output by the high gray scale data is higher, that is, if there is a gray scale with bright and dark differences in an image, the dark image is darker and the bright image is brighter through data adjustment, so that the difference between the bright and dark images is increased, the effect of increasing the contrast is realized, and the image hierarchy is clearer. However, such dynamic data adjustment has a disadvantage that the pixel gray scale is lost after the data adjustment, so that the image detail is not clear and fine. Therefore, the dynamic GAMMA voltage adjustment of the present invention is needed to adjust the gray level GAMMA voltage based on the dynamic data, so that the gray level voltage of each pixel is different and the displayed level is more vivid.
For example: the original input is 17 gray levels of pixel data, and the 17 gray levels of corresponding gray level voltages can be divided into 0, 1, 2. Since the output is 6-gray-scale pixel data after the dynamic data adjustment, if the GAMMA voltage is not adjusted at this time, the middle pixel gray scale is lost. The reason for this is that: the gray scale voltage layers which can be separated from the gray scale voltage corresponding to the 6 gray scales are only 0, 1 and 2, 6, so that the gray scale voltage of 11 layers is reduced compared with that of 17 gray scales, and if the gray scale voltage corresponding to the 6 gray scales is not adjusted and refined, the gray scale voltage of the middle 11 layers is lost, so that an image becomes fuzzy, and the layering sense is weak. Therefore, the GAMMA voltage adjustment is needed to subdivide the gray scale voltage corresponding to the 6 gray scales into 17 gray scale voltage levels. I.e. a gray scale voltage of 6 gray scales is divided into 17 layers. Preferably, the gray scale voltage corresponding to the 6 gray scales is equally divided into 17 layers at an equal voltage value. The adjusted corresponding pixel voltage of each gray scale is not changed, the GAMMA voltage corresponding to the gray scale of each pixel of the image display is not lost, and the expressed color is more bright. In this way, even when the whole displayed image is dark, black with different shades can be displayed after the dynamic gamma voltage adjustment, and when the whole displayed image is bright, white with different shades can be displayed after the gamma voltage adjustment.
As described above, the dynamic GAMMA voltages can be selected to have different GAMMA voltages according to the content (brightness) of the image, so that the contrast of the image is different from image to image, thereby realizing the dynamic contrast function.
As shown in fig. 3, the dynamic contrast adjusting apparatus according to the present invention includes:
the gray scale reading module 3 reads and outputs the gray scales of all pixels in the current frame image;
the gray scale adjusting module 4 is used for receiving the gray scale of each pixel output by the gray scale reading module 3, comparing the received gray scale of each pixel with a first preset gray scale, and performing dynamic data adjustment on the gray scale of each pixel according to the comparison result;
the dynamic gamma voltage generation module 5 subdivides the gray scale voltage corresponding to the pixel adjusted by the gray scale adjustment module, so that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale without the dynamic gray scale adjustment, and outputs a plurality of subdivided gamma voltages.
As a further embodiment of the present invention, in the above embodiment, the gray level adjusting module 4 includes: a gray scale comparison submodule and a dynamic data adjustment submodule; wherein,
the gray scale comparison submodule compares the gray scale of each pixel with a first preset gray scale respectively and outputs a comparison result;
and the dynamic data adjusting submodule receives the comparison result output by the gray scale comparison submodule and adjusts the gray scale of each pixel to be higher or lower according to the comparison result.
As a further embodiment of the present invention, the dynamic gamma voltage generation module 5 in the above embodiment includes: a gray scale voltage subdivision module and a gamma voltage generation submodule, wherein,
the gray scale voltage subdivision module subdivides the gray scale voltage corresponding to the pixel adjusted by the gray scale adjustment module, so that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale when the dynamic gray scale adjustment is not performed;
and the gamma voltage generation submodule generates and outputs a plurality of subdivided gamma voltages according to the subdivision result output by the gray scale voltage subdivision module.
The liquid crystal television set provided by the invention comprises the dynamic contrast adjusting device in any one of the embodiments. Of course, as shown in fig. 5, the dynamic contrast adjusting device may also be integrated in a timing controller (ICON), so that the dynamic contrast adjusting device may select different GAMMA voltages according to the brightness of the image, and thus different gray scale voltages may be applied to each level of pixels, thereby achieving the advantages of fine and smooth image and clear gradation. Fig. 4 shows a circuit block diagram of a liquid crystal display panel in the prior art, in which a GAMMA resistor string is used to divide the voltage of each gray level into gray levels corresponding to each gray level, and this conventional display method with fixed gray levels does not change the GAMMA voltage of the pixels according to the content (brightness) of the image, which has the disadvantage of single contrast.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (9)
1. A method for adjusting dynamic contrast is characterized by comprising the following steps:
dynamic gray scale adjustment:
reading the gray scales of all pixels in the current frame image;
respectively comparing the gray scale of each pixel with a first preset gray scale, and adjusting the gray scale of each pixel according to the comparison result to obtain the adjusted gray scale corresponding to each pixel; and the number of the first and second groups,
dynamic gamma voltage adjustment:
subdividing the gray scale voltage corresponding to the pixel after the dynamic gray scale adjustment to ensure that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale when the dynamic gray scale adjustment is not carried out;
outputting the subdivided gamma voltages.
2. The method for adjusting dynamic contrast of claim 1, wherein the gray scale of each pixel is compared with a first predetermined gray scale, and the gray scale of each pixel is adjusted according to the comparison result to obtain the adjusted gray scale corresponding to each pixel; the method comprises the following steps:
determining a first preset gray scale;
comparing the gray scale of the pixel with the first preset gray scale to obtain a comparison result;
if the comparison result is: if the gray scale of the pixel is between the first preset gray scale and the maximum gray scale, the gray scale of the pixel is increased;
if the comparison result is: if the gray scale of the pixel is between the minimum gray scale and the first preset gray scale, the gray scale of the pixel is reduced;
the maximum gray scale is the maximum gray scale provided by the display device, and the minimum gray scale is the minimum gray scale provided by the display device.
3. The method for adjusting dynamic contrast of claim 2, wherein the gray scale of each pixel is compared with a first predetermined gray scale, and the dynamic data adjustment is performed on the gray scale of each pixel according to the comparison result; the steps further include:
calculating the average gray scale of all pixels of the image;
judging whether the average gray scale is larger than a second preset gray scale or not; if yes, the image is a highlight image; otherwise, the image is a low brightness image;
comparing the gray scale of each pixel with a first preset gray scale, and performing dynamic data adjustment on the gray scale of each pixel according to the comparison result, wherein the step further comprises:
if the image is a highlight image, the gray scale of the pixel with the gray scale between the minimum gray scale and the first preset gray scale in the image is turned down by a higher amplitude than the gray scale of the pixel with the gray scale between the first preset gray scale and the maximum gray scale in the image;
if the image is a low-brightness image, the gray scale of the pixel with the gray scale between the minimum gray scale and the first preset gray scale in the image is turned down by an amplitude lower than the gray scale of the pixel with the gray scale between the first preset gray scale and the maximum gray scale in the image.
4. The method as claimed in claim 3, wherein the first predetermined gray level is equal to the second predetermined gray level.
5. The method for adjusting dynamic contrast according to claim 1, wherein the gray scale voltages corresponding to the pixels with the adjusted dynamic gray scale are subdivided, and the subdividing method specifically comprises: and (4) equally dividing the voltage values.
6. A dynamic contrast adjusting apparatus, comprising:
the gray scale reading module reads and outputs the gray scales of all pixels in the current frame image;
the gray scale adjusting module is used for receiving the gray scale of each pixel output by the gray scale reading module, comparing the received gray scale of each pixel with a first preset gray scale and carrying out dynamic data adjustment on the gray scale of each pixel according to a comparison result; and the number of the first and second groups,
and the dynamic gamma voltage generation module is used for subdividing the gray scale voltage corresponding to the pixel adjusted by the gray scale adjustment module, so that the order of the gray scale voltage corresponding to the gray scale of the pixel is the same as the order of the gray scale voltage corresponding to the gray scale of the pixel when the gray scale adjustment module is not adjusted, and outputting a plurality of subdivided gamma voltages.
7. The dynamic contrast adjustment device of claim 6, wherein the gray scale adjustment module comprises: a gray scale comparison submodule and a dynamic data adjustment submodule; wherein,
the gray scale comparison submodule compares the gray scale of each pixel with a first preset gray scale respectively and outputs a comparison result;
and the dynamic data adjusting submodule receives the comparison result output by the gray scale comparison submodule and adjusts the gray scale of each pixel to be higher or lower according to the comparison result.
8. The dynamic contrast adjustment apparatus of claim 6, wherein the dynamic gamma voltage generation module comprises: a gray scale voltage subdivision module and a gamma voltage generation submodule, wherein,
the gray scale voltage subdivision module subdivides the gray scale voltage corresponding to the pixel adjusted by the gray scale adjustment module, so that the order of the gray scale voltage corresponding to the pixel gray scale is the same as the order of the gray scale voltage corresponding to the pixel gray scale when the dynamic gray scale adjustment is not performed;
and the gamma voltage generation submodule generates and outputs a plurality of subdivided gamma voltages according to the subdivision result output by the gray scale voltage subdivision module.
9. A liquid crystal television comprising the dynamic contrast adjusting apparatus according to any one of claims 6 to 9.
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| CN111491148A (en) * | 2015-05-12 | 2020-08-04 | 松下电器（美国）知识产权公司 | Display method |
| WO2017121140A1 (en) * | 2016-01-15 | 2017-07-20 | 合一智能科技（深圳）有限公司 | Display control method and device for liquid crystal display screen |
| WO2018040485A1 (en) * | 2016-08-29 | 2018-03-08 | 深圳市华星光电技术有限公司 | Method and device for improving lcd large viewing angle display |
| US10395608B2 (en) | 2016-08-29 | 2019-08-27 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Method and device for improving LCD large viewing angle display effect |
| CN112382247A (en) * | 2020-11-05 | 2021-02-19 | 深圳市华星光电半导体显示技术有限公司 | Display device and gamma curve adjusting method thereof |
| 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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