CN106652925B - Image processing method and liquid crystal display - Google Patents
Image processing method and liquid crystal display Download PDFInfo
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Abstract
The embodiment of the invention provides an image processing method and a liquid crystal display, relates to the field of liquid crystal displays, and can effectively solve the problem of color cast of a picture displayed by the liquid crystal display. Acquiring a gray scale value of each display partition in N display partitions, wherein N is an integer greater than or equal to 1; setting a backlight value of a corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas; adjusting the gray-scale value of the first display partition according to the difference value between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions. The method is used for solving the problem of color cast of the picture displayed by the liquid crystal display.
Description
Technical Field
The invention relates to the field of liquid crystal displays, in particular to an image processing method and a liquid crystal display.
Background
Currently, in the field of liquid crystal displays, quantum dot technology is generally used to realize high color gamut display of the liquid crystal display. Specifically, a quantum dot film is packaged between two water oxygen barrier films, quantum dots are arranged in the quantum dot film, the quantum dot film and the two water oxygen barrier films are placed above a diffusion plate or a light guide plate, a blue light source is adopted to irradiate the diffusion plate or the light guide plate, the blue light passing through the diffusion plate or the light guide plate is irradiated on the quantum dot film, the quantum dot film converts the blue light into red light, green light and blue light, the red light, the green light and the blue light form white light, namely the quantum dot film converts the blue light into the white light, and the quantum dot film is a white light conversion layer, so that high-color-gamut display of the liquid crystal display is realized.
In the prior art, in order to make the high color gamut display effect of the liquid crystal display better, a partition dynamic control (local dimming) technology is adopted to improve the contrast of the liquid crystal display. The partition dynamic control is to divide the backlight area into hundreds or more backlight partitions, and independently control the backlight source of each backlight partition to provide illumination for the display area. The backlight source is arranged in the backlight area, the display area can be a liquid crystal display screen, and the liquid crystal display screen comprises the liquid crystal display screen and the backlight source of blue light. The display area corresponding to each backlight partition is a display partition, and the white light irradiated to each display partition is white light formed by converting the blue light into red light, green light and blue light through the quantum dot film. Illustratively, as shown in fig. 1, the liquid crystal display displays a full white screen. As shown in fig. 2, when the lcd displays a full white picture, the light diagram of the display sub-regions of the lcd is shown, the blue light of each display sub-region is mainly the blue light from the backlight sub-region corresponding to the display sub-region, the red light and the green light of each display sub-region are mainly the red light and the green light excited by the blue light from the backlight sub-region corresponding to the display sub-region after passing through the white light conversion layer, and the blue light of other backlight sub-regions in the backlight sub-region except the backlight sub-region corresponding to the display sub-region is excited and emitted to the red light and the green light of the display sub-region by. As shown in fig. 3, the liquid crystal display displays a window screen. As shown in fig. 4, when the liquid crystal display displays a window frame, the light ray diagram of the display partition of the liquid crystal display is shown, the backlight source of the backlight partition corresponding to the display partition B of the window frame is turned on, and the backlight source of the backlight partition corresponding to the display partition other than the display partition B of the window frame in the display area is turned off or darkened, so that the high color gamut display effect of the liquid crystal display is better through the partition dynamic control technology.
However, the blue light of the window frame is basically unchanged, and since the backlight source of the backlight partition corresponding to the display partition other than the display partition B of the window frame in the display area a is turned off or darkened, the red light and the green light of the window frame only include the red light and the green light excited after the blue light from the backlight partition corresponding to the display partition B of the window frame passes through the white light conversion layer, the red light and the green light of the window frame are reduced, so that the red (R) gray level value and the green (G) gray level value in the case of the window frame are smaller than those in the case of a full white frame, and the frame displayed by the liquid crystal display has a color cast problem.
Disclosure of Invention
The embodiment of the invention provides an image processing method and a liquid crystal display, which can effectively solve the problem of color cast of a picture displayed by the liquid crystal display.
In order to achieve the purpose, the embodiment of the invention adopts the technical scheme that:
in a first aspect, an image processing method applied to a liquid crystal display includes:
acquiring a gray scale value of each display partition in N display partitions, wherein N is an integer greater than or equal to 1;
setting a backlight value of a corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas;
adjusting the gray-scale value of the first display partition according to the difference value between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions.
With reference to the first aspect, in a first implementable manner of the first aspect, the adjusting the gray-scale value of the first display partition according to a difference between the backlight value of the first display partition and the backlight values of N-1 display partitions except for the first display partition, and a distance parameter between the first display partition and the N-1 display partitions includes:
acquiring a backlight influence coefficient according to the difference between the backlight value of the first display subarea and the backlight values of the N-1 display subareas except the first display subarea and the distance parameter between the first display subarea and the N-1 display subareas, wherein the backlight influence coefficient is used for representing the phase difference relation of the backlight values of the backlight subareas corresponding to the display subareas between the adjacent display subareas, the backlight values of the backlight subareas corresponding to the display subareas are the backlight values of the backlight subareas corresponding to the display subareas which are set according to the gray-scale values of the display subareas, and the backlight subareas are provided with backlight sources;
when the backlight influence coefficient is larger than a preset value, reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
when the backlight influence coefficient is smaller than a preset value, increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
the gray scale values of the display subareas comprise a red gray scale value, a green gray scale value and a blue gray scale value.
With reference to the first implementable manner of the first aspect, in a second implementable manner of the first aspect, the obtaining a backlight influence coefficient according to a difference between the backlight value of the first display partition and the backlight values of N-1 display partitions other than the first display partition, and a distance parameter between the first display partition and the N-1 display partitions includes:
acquiring the difference between the backlight value of the first display partition and the backlight value of each display partition in the backlight values of the N-1 display partitions except the first display partition to obtain N-1 difference values;
obtaining the product of each difference value and a corresponding distance parameter to obtain N-1 product values, wherein the corresponding distance parameter is the distance parameter between the first display partition and the display partition for obtaining the difference value in the N-1 display partitions;
and acquiring the backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
With reference to the first implementable manner of the first aspect or the second implementable manner of the first aspect, in a third implementable manner of the first aspect, after the obtaining of the backlight influence coefficient, the method further includes:
obtaining an adjusting coefficient according to the gray-scale value and the gamma curve of the first display partition;
and acquiring an integral value of the product of the ratio of the backlight influence coefficient to the backlight value of the first display subarea, the adjustment coefficient and 255.
With reference to the third implementable manner of the first aspect, in a fourth implementable manner of the first aspect, the reducing the red gray scale value of the first display partition to obtain an adjusted red gray scale value of the first display partition, and reducing the green gray scale value of the first display partition to obtain an adjusted green gray scale value of the first display partition includes:
reducing the red gray scale value of the first display subarea according to the rounded value to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea according to the rounded value to obtain an adjusted green gray scale value of the first display subarea;
the increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and the increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea includes:
and increasing the red gray scale value of the first display subarea according to the rounded value to obtain the adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea according to the rounded value to obtain the adjusted green gray scale value of the first display subarea.
With reference to the third implementable manner of the first aspect, in a fifth implementable manner of the first aspect, when the backlight influence coefficient is smaller than a preset value, the method further includes:
when the red-gray scale value of the first display partition is 255,
increasing the green gray scale value of the first display partition according to the rounding value to obtain an adjusted green gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition;
when the green gray scale value of the first display sub-area is 255,
and increasing the red gray scale value of the first display partition according to the rounding value to obtain an adjusted red gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition.
In a second aspect, there is provided a liquid crystal display comprising:
the device comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring a gray-scale value of each display subarea in N display subareas, and N is an integer greater than or equal to 1;
the setting unit is used for setting the backlight value of the corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas;
and the adjusting unit is used for adjusting the gray-scale value of the first display partition according to the difference value between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions.
With reference to the second aspect, in a first implementable manner of the second aspect, the adjusting unit is specifically configured to:
acquiring a backlight influence coefficient according to the difference between the backlight value of the first display subarea and the backlight values of the N-1 display subareas except the first display subarea and the distance parameter between the first display subarea and the N-1 display subareas, wherein the backlight influence coefficient is used for representing the phase difference relation of the backlight values of the backlight subareas corresponding to the display subareas between the adjacent display subareas, the backlight values of the backlight subareas corresponding to the display subareas are the backlight values of the backlight subareas corresponding to the display subareas which are set according to the gray-scale values of the display subareas, and the backlight subareas are provided with backlight sources;
when the backlight influence coefficient is larger than a preset value, reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
when the backlight influence coefficient is smaller than a preset value, increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
the gray scale values of the display subareas comprise a red gray scale value, a green gray scale value and a blue gray scale value.
With reference to the first implementable manner of the second aspect, in a second implementable manner of the second aspect, the adjusting unit is specifically configured to:
acquiring the difference between the backlight value of the first display partition and the backlight value of each display partition in the backlight values of the N-1 display partitions except the first display partition to obtain N-1 difference values;
obtaining the product of each difference value and a corresponding distance parameter to obtain N-1 product values, wherein the corresponding distance parameter is the distance parameter between the first display partition and the display partition for obtaining the difference value in the N-1 display partitions;
and acquiring the backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
With reference to the first implementable manner of the second aspect or the second implementable manner of the second aspect, in a third implementable manner of the second aspect, the obtaining unit is further configured to:
obtaining an adjusting coefficient according to the gray-scale value and the gamma curve of the first display partition;
and acquiring an integral value of the product of the ratio of the backlight influence coefficient to the backlight value of the first display subarea, the adjustment coefficient and 255.
With reference to the third implementable manner of the second aspect, in a fourth implementable manner of the second aspect, the adjusting unit is specifically configured to:
reducing the red gray scale value of the first display subarea according to the rounded value to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea according to the rounded value to obtain an adjusted green gray scale value of the first display subarea;
and increasing the red gray scale value of the first display subarea according to the rounded value to obtain the adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea according to the rounded value to obtain the adjusted green gray scale value of the first display subarea.
With reference to the third implementable manner of the second aspect, in a fifth implementable manner of the second aspect, the adjusting unit is specifically configured to:
when the red-gray scale value of the first display partition is 255,
increasing the green gray scale value of the first display partition according to the rounding value to obtain an adjusted green gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition;
when the green gray scale value of the first display sub-area is 255,
and increasing the red gray scale value of the first display partition according to the rounding value to obtain an adjusted red gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition.
The image processing method and the liquid crystal display provided by the embodiment of the invention comprise the following steps of firstly, obtaining a gray-scale value of each display subarea in N display subareas; then, setting a backlight value of a corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas; and adjusting the gray-scale value of the first display partition according to the difference value between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions. Therefore, the image color of the liquid crystal display is closer to the reality by adjusting the gray-scale value of each display subarea, and the problem of color cast of the picture displayed by the liquid crystal display can be effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art LCD displaying a full white screen;
FIG. 2 is a schematic diagram of a prior art display partition light for displaying a full white frame of a liquid crystal display;
FIG. 3 is a diagram illustrating a prior art LCD display window;
FIG. 4 is a schematic diagram of a prior art display region light for displaying a window frame of a liquid crystal display;
FIG. 5 is a flowchart of an image processing method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a display partition structure of an LCD according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating distance coefficients between display sub-regions of an LCD according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a display partition structure of another LCD according to an embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating distance coefficients between display sub-regions of another LCD according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a gamma curve according to an embodiment of the present invention;
fig. 11 is a schematic view of a liquid crystal display according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
An embodiment of the present invention provides an image processing method applied to a liquid crystal display, as shown in fig. 5, the method includes:
The gray scale values of the display sub-regions include a red gray scale value, a green gray scale value, and a blue gray scale value. First, the liquid crystal display may decompose red, green, and blue (RGB) pixel information by a Low-Voltage Differential Signaling (LVDS) of a display partition. Then, a red gray scale value, a green gray scale value and a blue gray scale value are respectively obtained according to red, green and blue (RGB) pixel information.
For example, the sum of the gray-scale values of all the red pixels in the display partition is obtained, the average gray-scale value of all the red pixels in the display partition is obtained according to the sum of the gray-scale values of all the red pixels in the display partition, and then the weighted average of the average gray-scale value of all the red pixels in the display partition and the maximum gray-scale value of all the red pixels in the display partition is obtained, so as to obtain the red gray-scale value of the display partition. And similarly, acquiring a green gray scale value and a blue gray scale value.
It should be noted that the N display partitions may be divided according to the N backlight partitions, the N backlight partitions may be divided according to the backlight sources, each backlight source is a backlight partition, the display partitions and the backlight partitions correspond to each other in a one-to-one manner, the N display partitions form a display area, and the N backlight partitions form a backlight area. Optionally, the N display partitions may be further divided according to an image displayed by an actual liquid crystal display, and then a backlight partial area corresponding to each display partition is a backlight partition, where the backlight partition may include one backlight source or may include a plurality of backlight sources.
For example, it is assumed that the liquid crystal display includes 9 display sections and 9 backlight sections, and the display sections and the backlight sections correspond to each other one-to-one. As shown in fig. 6, the display partition diagram of the liquid crystal display includes a display partition 1, a display partition 2, a display partition 3, a display partition 4, a display partition 5, a display partition 6, a display partition 7, a display partition 8, and a display partition 9.
And 102, setting a backlight value of the corresponding backlight partition according to the gray-scale value of each display partition in the N display partitions.
For example, if the statistical gray-scale value is 100 and the full gray-scale value is 255, the corresponding backlight value is a duty ratio of 100/256, and the backlight value is a backlight driving value, and then the current value of the backlight partition driving or the duty ratio of the current is adjusted according to the backlight driving value, so as to adjust the brightness of each backlight partition. Optionally, the brightness of the backlight partition may also be adjusted by current, 100/256 × I, I being the maximum current value.
Specifically, a backlight influence coefficient is obtained according to a difference value between a backlight value of the first display partition and backlight values of N-1 display partitions except the first display partition and a distance parameter between the first display partition and the N-1 display partitions; then, when the backlight influence coefficient is larger than a preset value, reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea; and when the backlight influence coefficient is smaller than the preset value, increasing the red gray scale value of the first display subarea to obtain the adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea to obtain the adjusted green gray scale value of the first display subarea. The backlight influence coefficient is used for representing the phase difference relation of backlight values of backlight partitions corresponding to the display partitions between adjacent display partitions, the backlight values of the backlight partitions corresponding to the display partitions are set according to gray-scale values of the display partitions, and the backlight partitions are provided with backlight sources.
Firstly, acquiring the difference between the backlight value of a first display partition and the backlight value of each display partition in the backlight values of N-1 display partitions except the first display partition to obtain N-1 difference values; obtaining the product of each difference value and a corresponding distance parameter to obtain N-1 product values, wherein the corresponding distance parameter is the distance parameter between the first display partition and the display partition for obtaining the difference value in the N-1 display partitions; and acquiring a backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
For example, the backlight influence coefficient of the display section 1 in fig. 6 is calculated. Firstly, acquiring the difference between the backlight value of a display partition 1 and the backlight value of each display partition in the backlight values of 8 display partitions except the display partition 1 to obtain 8 difference values; obtaining the product of each difference value and a corresponding distance parameter to obtain 8 product values, wherein the corresponding distance parameter is the distance parameter between the display subareas which obtain the difference value in the display subareas 1 and 8 display subareas; and acquiring a backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
Suppose that the backlight value of the display partition is BL, the backlight influence coefficient is Δ BL, the distance parameter between the display partitions is L, the display partition distance influence factor of the display partition 3, the display partition 5, the display partition 7, the display partition 9 and the display partition 1 is a, and the display partition distance influence factor of the display partition 2, the display partition 4, the display partition 6, the display partition 8 and the display partition 1 is b.
△BL＝[(BL3-BL1)×L13+(BL5-BL1)×L15+(BL7-BL1)×L17+(BL9-BL1)×L19]×a+[(BL2-BL1)×L12+(BL4-BL1)×L14+(BL6-BL1)×L16+(BL8-BL1)×L18]×b
Wherein BL1To display the backlight value of partition 1, BL2To display the backlight value of partition 2, in turnBy analogy, BL3To display the backlight value of partition 3, BL4To display the backlight value of partition 4, BL5To display the backlight value of partition 5, BL6To display the backlight value of the partition 6, BL7To display the backlight value of the partition 7, BL8To display the backlight value of the partition 8, BL9To show the backlight value of the partition 9. L is13For the distance parameter between display partition 1 and display partition 3, L12Is a distance parameter between display partition 1 and display partition 2.
Note that a and b represent weights, a + b is 1, and a and b may be the same or different. The display partition distance influencing factor can be adjusted according to the actual conditions such as the size of the display partition, the distance between a Printed Circuit Board (PCB) provided with a backlight source and a diffusion plate, the size of a light spot selected by a direct type optical lens (lens) arranged on the backlight source and the like.
The distance parameter between display partitions may be a distance from a center point of one display partition to a center point of another display partition. Optionally, if the display partitions are divided equally, the distance parameter between the display partitions may also be a distance coefficient between the display partitions.
As shown in fig. 7 based on fig. 6, the distance coefficient between the partitions is displayed. The distance coefficient between partition 1 and partition 3 is
The distance coefficient between the partition 1 and the partition 5 is
The distance coefficient between the partition 1 and the partition 7 is
The distance coefficient between the partition 1 and the partition 9 is
The distance coefficient between the partition 1 and the partition 2 is
The distance coefficient between the partition 1 and the partition 4 is
The distance coefficient between the partition 1 and the partition 6 is
The distance coefficient between the partition 1 and the partition 8 is
For example, as shown in fig. 8, if the lcd includes 25 display partitions, as shown in fig. 9, the distance coefficient between the 25 display partitions.
The backlight influence coefficient Δ BL may be:
then, an adjustment coefficient is obtained according to the gray-scale value and the gamma curve of the first display partition.
As shown in fig. 10, a gamma curve. The abscissa is the gray scale value and the ordinate is the normalized luminance. The gray scale value of the abscissa is the gray scale value of the liquid crystal display with 8 bits, i.e. the gray scale value of the liquid crystal display is 28-256. If the gray scale value of the liquid crystal display screen is 10 bits, namely the gray scale value of the liquid crystal display screen is 210-1024. Specifically, the adjustment coefficient can be obtained according to equation 1.1,
The function f can be selected according to gamma curves used by different manufacturers of lcds, and w and γ in fig. 8 are gamma curves used by different manufacturers. x is used to represent gray-scale values, c is used to represent the variation of the gray-scale values selected according to the gamma curve used by different manufacturers of the liquid crystal display, and y is used to represent the adjustment coefficient. The gray scale values of the display sub-regions include a red gray scale value, a green gray scale value, and a blue gray scale value. The adjustment coefficients may be obtained for the red, green, and blue gray scale values according to equation 1.1 above.
And thirdly, adjusting the gray-scale value of the first display subarea according to the ratio of the backlight influence coefficient to the backlight value of the first display subarea and the integral value of the product of the adjustment coefficient and 255.
And when the backlight influence coefficient is larger than the preset value, the red gray scale value of the first display subarea is reduced according to the rounding value to obtain the adjusted red gray scale value of the first display subarea, and the green gray scale value of the first display subarea is reduced according to the rounding value to obtain the adjusted green gray scale value of the first display subarea.
The reducing of the red and green gray scale values of the first display partition may be a subtraction, or a weighted subtraction.
Illustratively, a ratio of the backlight influence coefficient to the backlight value of the first display partition is obtained; and acquiring an integral value of the product of the ratio, the adjustment coefficient and 255. And acquiring the difference between the red gray scale value of the first display subarea and the rounding value to obtain the adjusted red gray scale value of the first display subarea, and acquiring the difference between the green gray scale value of the first display subarea and the rounding value to obtain the adjusted green gray scale value of the first display subarea.
The gray scale values of the first display subarea comprise a red gray scale value and a green gray scale value, and the red gray scale value of the first display subarea is assumed to be m, the green gray scale value of the first display subarea is assumed to be n, and the adjusting coefficient is gamma.
The adjusted red-gray scale value of the first display subarea is as follows:
the adjusted green gray scale value of the first display subarea is as follows:
wherein int is a rounding function.
And when the backlight influence coefficient is smaller than the preset value, increasing the red gray scale value of the first display subarea according to the rounding value to obtain an adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea according to the rounding value to obtain an adjusted green gray scale value of the first display subarea.
The increasing of the red gray scale value and the green gray scale value of the first display subarea may be addition or weighted addition.
Illustratively, a ratio of the backlight influence coefficient to the backlight value of the first display partition is obtained; and acquiring an integral value of the product of the ratio, the adjustment coefficient and 255. And acquiring the sum of the red gray scale value of the first display subarea and the rounding value to obtain the adjusted red gray scale value of the first display subarea, and acquiring the sum of the green gray scale value of the first display subarea and the rounding value to obtain the adjusted green gray scale value of the first display subarea.
The gray scale values of the first display subarea comprise a red gray scale value and a green gray scale value, and the red gray scale value of the first display subarea is assumed to be m, the green gray scale value of the first display subarea is assumed to be n, and the adjusting coefficient is gamma.
The adjusted red-gray scale value of the first display subarea is as follows:
the adjusted green gray scale value of the first display subarea is as follows:
wherein int is a rounding function.
It should be noted that the preset value may be 0.
Specifically, if the red gray scale value of the first display sub-area has reached 255, which is the maximum value of the gray scale values, and the backlight influence coefficient is smaller than 0, the red gray scale value of the first display sub-area cannot be increased any more, and the blue gray scale value of the first display sub-area needs to be decreased and the green gray scale value needs to be increased to adjust the color shift of the first display sub-area.
Similarly, if the green gray scale value of the first display sub-area has reached 255 and the backlight influence coefficient is smaller than 0, the green gray scale value of the first display sub-area cannot be increased any more, and the color shift of the first display sub-area needs to be adjusted by decreasing the blue gray scale value of the first display sub-area and increasing the red gray scale value.
If the red gray scale value of the first display sub-area has reached 255, and the green gray scale value of the first display sub-area has reached 255, and the backlight influence coefficient is smaller than 0, the red gray scale value and the green gray scale value of the first display sub-area cannot be increased any more, and the blue gray scale value of the first display sub-area needs to be decreased to adjust the color cast of the first display sub-area.
And acquiring the difference between the blue gray scale value and the rounding value of the first display partition to obtain the adjusted blue gray scale value of the first display partition, and specifically, adjusting the blue gray scale value by referring to a method for adjusting the red gray scale value and the green gray scale value.
Illustratively, the blue gray level value of the first display partition is l, the adjustment coefficient is γ,
the adjusted blue-gray level value of the first display partition is as follows:
the backlight influence coefficient is equal to a preset value, and the gray-scale value of the first display subarea is not adjusted.
In this way, firstly, the gray-scale value of each display partition in the N display partitions is obtained; then, setting a backlight value of a corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas; and adjusting the gray-scale value of the first display partition according to the difference value between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions. Therefore, the image color of the liquid crystal display is closer to the reality by adjusting the gray-scale value of each display subarea, and the problem of color cast of the picture displayed by the liquid crystal display can be effectively solved.
Example 3
An embodiment of the present invention provides a liquid crystal display 30, as shown in fig. 11, including:
an obtaining unit 301, configured to obtain a grayscale value of each display partition in N display partitions, where N is an integer greater than or equal to 1;
a setting unit 302, configured to set a backlight value of a corresponding backlight partition according to a gray-scale value of each display partition in the N display partitions;
an adjusting unit 303, configured to adjust a gray scale value of the first display partition according to a difference between the backlight value of the first display partition and the backlight values of N-1 display partitions except the first display partition, and a distance parameter between the first display partition and the N-1 display partitions, to obtain an adjusted gray scale value of the first display partition, where the first display partition is each of the N display partitions.
The liquid crystal display provided by the embodiment of the invention comprises the following steps of firstly, obtaining a gray-scale value of each display subarea in N display subareas; then, setting a backlight value of a corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas; and adjusting the gray-scale value of the first display partition according to the difference value between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions. Therefore, the image color of the liquid crystal display is closer to the reality by adjusting the gray-scale value of each display subarea, and the problem of color cast of the picture displayed by the liquid crystal display can be effectively solved.
The adjusting unit 303 is specifically configured to:
acquiring a backlight influence coefficient according to the difference between the backlight value of the first display subarea and the backlight values of the N-1 display subareas except the first display subarea and the distance parameter between the first display subarea and the N-1 display subareas, wherein the backlight influence coefficient is used for representing the phase difference relation of the backlight values of the backlight subareas corresponding to the display subareas between the adjacent display subareas, the backlight values of the backlight subareas corresponding to the display subareas are the backlight values of the backlight subareas corresponding to the display subareas which are set according to the gray-scale values of the display subareas, and the backlight subareas are provided with backlight sources;
when the backlight influence coefficient is larger than a preset value, reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
when the backlight influence coefficient is smaller than a preset value, increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
the gray scale values of the display subareas comprise a red gray scale value, a green gray scale value and a blue gray scale value.
The adjusting unit 303 is specifically configured to:
acquiring the difference between the backlight value of the first display partition and the backlight value of each display partition in the backlight values of the N-1 display partitions except the first display partition to obtain N-1 difference values;
obtaining the product of each difference value and a corresponding distance parameter to obtain N-1 product values, wherein the corresponding distance parameter is the distance parameter between the first display partition and the display partition for obtaining the difference value in the N-1 display partitions;
and acquiring the backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
The obtaining unit 301 is further configured to:
obtaining an adjusting coefficient according to the gray-scale value and the gamma curve of the first display partition;
and acquiring an integral value of the product of the ratio of the backlight influence coefficient to the backlight value of the first display subarea, the adjustment coefficient and 255.
The adjusting unit 303 is specifically configured to:
reducing the red gray scale value of the first display subarea according to the rounded value to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea according to the rounded value to obtain an adjusted green gray scale value of the first display subarea;
and increasing the red gray scale value of the first display subarea according to the rounded value to obtain the adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea according to the rounded value to obtain the adjusted green gray scale value of the first display subarea.
The adjusting unit 303 is specifically configured to:
when the red-gray scale value of the first display partition is 255,
increasing the green gray scale value of the first display partition according to the rounding value to obtain an adjusted green gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition;
when the green gray scale value of the first display sub-area is 255,
and increasing the red gray scale value of the first display partition according to the rounding value to obtain an adjusted red gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Each functional unit in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. The functions of the first obtaining unit, the second obtaining unit, the adjusting unit and the third obtaining unit may be implemented by different Integrated Circuits (ICs), or may be implemented by one IC.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media capable of storing program codes, such as Read-Only Memory (ROM), Random-Access Memory (RAM), magnetic disk, and optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (12)
1. An image processing method applied to a liquid crystal display includes:
acquiring a gray scale value of each display partition in N display partitions, wherein N is an integer greater than or equal to 1;
setting a backlight value of a corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas;
adjusting the gray-scale value of a first display partition according to the difference value between the backlight value of the first display partition and the backlight values of N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions to obtain the adjusted gray-scale value of the first display partition, wherein the first display partition is each display partition in the N display partitions.
2. The method of claim 1, wherein the adjusting the gray level value of the first display partition according to the difference between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions comprises:
acquiring a backlight influence coefficient according to the difference between the backlight value of the first display subarea and the backlight values of the N-1 display subareas except the first display subarea and the distance parameter between the first display subarea and the N-1 display subareas, wherein the backlight influence coefficient is used for representing the phase difference relation of the backlight values of the backlight subareas corresponding to the display subareas between the adjacent display subareas, the backlight values of the backlight subareas corresponding to the display subareas are the backlight values of the backlight subareas corresponding to the display subareas which are set according to the gray-scale values of the display subareas, and the backlight subareas are provided with backlight sources;
when the backlight influence coefficient is larger than a preset value, reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
when the backlight influence coefficient is smaller than a preset value, increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
the gray scale values of the display subareas comprise a red gray scale value, a green gray scale value and a blue gray scale value.
3. The method of claim 2, wherein the obtaining the backlight influence coefficients according to the difference between the backlight value of the first display partition and the backlight values of the N-1 display partitions except the first display partition and the distance parameter between the first display partition and the N-1 display partitions comprises:
acquiring the difference between the backlight value of the first display partition and the backlight value of each display partition in the backlight values of the N-1 display partitions except the first display partition to obtain N-1 difference values;
obtaining the product of each difference value and a corresponding distance parameter to obtain N-1 product values, wherein the corresponding distance parameter is the distance parameter between the first display partition and the display partition for obtaining the difference value in the N-1 display partitions;
and acquiring the backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
4. The method of claim 2 or 3, wherein after said obtaining the backlight impact coefficients, the method further comprises:
obtaining an adjusting coefficient according to the gray-scale value and the gamma curve of the first display partition;
and acquiring an integral value of the product of the ratio of the backlight influence coefficient to the backlight value of the first display subarea, the adjustment coefficient and 255.
5. The method of claim 4,
the reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea includes:
reducing the red gray scale value of the first display subarea according to the rounded value to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea according to the rounded value to obtain an adjusted green gray scale value of the first display subarea;
the increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and the increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea includes:
and increasing the red gray scale value of the first display subarea according to the rounded value to obtain the adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea according to the rounded value to obtain the adjusted green gray scale value of the first display subarea.
6. The method of claim 4, wherein when the backlight impact coefficient is smaller than a predetermined value, the method further comprises:
when the red-gray scale value of the first display partition is 255,
increasing the green gray scale value of the first display partition according to the rounding value to obtain an adjusted green gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition;
when the green gray scale value of the first display sub-area is 255,
and increasing the red gray scale value of the first display partition according to the rounding value to obtain an adjusted red gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition.
7. A liquid crystal display, comprising:
the device comprises an acquisition unit, a display unit and a control unit, wherein the acquisition unit is used for acquiring a gray-scale value of each display subarea in N display subareas, and N is an integer greater than or equal to 1;
the setting unit is used for setting the backlight value of the corresponding backlight subarea according to the gray-scale value of each display subarea in the N display subareas;
the adjusting unit is configured to adjust a gray scale value of a first display partition according to a difference between a backlight value of the first display partition and backlight values of N-1 display partitions except the first display partition and a distance parameter between the first display partition and the N-1 display partitions, so as to obtain an adjusted gray scale value of the first display partition, where the first display partition is each of the N display partitions.
8. The lcd of claim 7, wherein the adjusting unit is specifically configured to:
acquiring a backlight influence coefficient according to the difference between the backlight value of the first display subarea and the backlight values of the N-1 display subareas except the first display subarea and the distance parameter between the first display subarea and the N-1 display subareas, wherein the backlight influence coefficient is used for representing the phase difference relation of the backlight values of the backlight subareas corresponding to the display subareas between the adjacent display subareas, the backlight values of the backlight subareas corresponding to the display subareas are the backlight values of the backlight subareas corresponding to the display subareas which are set according to the gray-scale values of the display subareas, and the backlight subareas are provided with backlight sources;
when the backlight influence coefficient is larger than a preset value, reducing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
when the backlight influence coefficient is smaller than a preset value, increasing the red gray scale value of the first display subarea to obtain an adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea to obtain an adjusted green gray scale value of the first display subarea;
the gray scale values of the display subareas comprise a red gray scale value, a green gray scale value and a blue gray scale value.
9. The lcd of claim 8, wherein the adjusting unit is specifically configured to:
acquiring the difference between the backlight value of the first display partition and the backlight value of each display partition in the backlight values of the N-1 display partitions except the first display partition to obtain N-1 difference values;
obtaining the product of each difference value and a corresponding distance parameter to obtain N-1 product values, wherein the corresponding distance parameter is the distance parameter between the first display partition and the display partition for obtaining the difference value in the N-1 display partitions;
and acquiring the backlight influence coefficient according to the N-1 product values and the display partition distance influence factors.
10. The lcd of claim 8 or 9, wherein the obtaining unit is further configured to:
obtaining an adjusting coefficient according to the gray-scale value and the gamma curve of the first display partition;
and acquiring an integral value of the product of the ratio of the backlight influence coefficient to the backlight value of the first display subarea, the adjustment coefficient and 255.
11. The lcd of claim 10, wherein the adjusting unit is specifically configured to:
reducing the red gray scale value of the first display subarea according to the rounded value to obtain an adjusted red gray scale value of the first display subarea, and reducing the green gray scale value of the first display subarea according to the rounded value to obtain an adjusted green gray scale value of the first display subarea;
and increasing the red gray scale value of the first display subarea according to the rounded value to obtain the adjusted red gray scale value of the first display subarea, and increasing the green gray scale value of the first display subarea according to the rounded value to obtain the adjusted green gray scale value of the first display subarea.
12. The lcd of claim 10, wherein the adjusting unit is specifically configured to:
when the red-gray scale value of the first display partition is 255,
increasing the green gray scale value of the first display partition according to the rounding value to obtain an adjusted green gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition;
when the green gray scale value of the first display sub-area is 255,
and increasing the red gray scale value of the first display partition according to the rounding value to obtain an adjusted red gray scale value of the first display partition, and decreasing the blue gray scale value of the first display partition to obtain an adjusted blue gray scale value of the first display partition.
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| CN110246466B (en) * | 2019-07-12 | 2021-01-29 | 业成科技（成都）有限公司 | Light source control method of display device and liquid crystal display device |
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