CN115100987A - Gamma correction method, Gamma correction device and related equipment - Google Patents
Gamma correction method, Gamma correction device and related equipment Download PDFInfo
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- CN115100987A CN115100987A CN202210690148.7A CN202210690148A CN115100987A CN 115100987 A CN115100987 A CN 115100987A CN 202210690148 A CN202210690148 A CN 202210690148A CN 115100987 A CN115100987 A CN 115100987A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2074—Display of intermediate tones using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
The invention provides a Gamma correction method, a Gamma correction device and related equipment, comprising the following steps: determining whether the brightness value of each single-color sub-pixel picture under the corresponding gray scale meets the preset Gamma correction requirement, if at least one single-color sub-pixel picture does not meet the requirement, adjusting the initialization voltage of each single-color sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, and/or adjusting the voltage value of each single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display equipment, and carrying out Gamma correction on the display equipment according to the brightness value of a white picture of the display equipment and the initial target Gamma curve or the adjusted target Gamma curve, thereby satisfying the Gamma correction requirement of the single-color sub-pixel picture while ensuring that the Gamma curve of the display equipment meets the requirement, and improving the display effect of the display equipment.
Description
Technical Field
The invention relates to the technical field of display, in particular to a Gamma correction method, a Gamma correction device and related equipment.
Background
Before the display device leaves a factory, Gamma correction is performed on the display device, so that a Gamma curve of the display device is adjusted to obtain a target Gamma curve required by the adjustment, and the display effect of a display picture viewed by human eyes is improved. The Gamma curve represents the proportional relation between the input signal and the output brightness of the display device under each gray scale.
However, in the prior art, Gamma correction is performed based on the luminance values of white pictures obtained by mixing and displaying the sub-pixels of each color of the display device according to the white balance ratio at each gray scale, and the Gamma correction effect of a single-color picture obtained when the sub-pixels of each color are displayed independently cannot be considered, so that the Gamma correction effect of the single-color picture cannot meet the requirement.
Disclosure of Invention
In view of the above, the present invention is directed to a Gamma correction method, a Gamma correction device and a related apparatus, which perform Gamma correction based on the luminance value of a white image and simultaneously take into account the Gamma correction effect of each single-color image.
In a first aspect, the present invention provides a Gamma correction method, including:
determining whether the brightness value of each single-color sub-pixel picture of the display equipment under the corresponding gray scale meets the preset Gamma correction requirement or not;
if the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, adjusting the initialization voltage of each single-color sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, and/or adjusting the voltage value of each single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display equipment;
performing Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and the initial target Gamma curve or the adjusted target Gamma curve; the white picture is a picture when all the single-color sub-pixels in the display device are displayed simultaneously.
Optionally, if the luminance value of at least one monochrome sub-pixel picture at the corresponding gray scale does not satisfy the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel, and/or adjusting a functional relationship of a first line segment of a target Gamma curve of the display device, and/or adjusting the voltage value of a monochrome sub-pixel at each gray scale of a second line segment of the target Gamma curve of the display device, includes:
if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales do not meet the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment;
and if the brightness value of part of the monochrome sub-pixel pictures at the corresponding gray scale does not meet the Gamma correction requirement, adjusting the voltage value of the monochrome sub-pixel at each gray scale of a second line segment of the target Gamma curve of the display equipment.
Optionally, if the luminance values of all the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel, and/or adjusting the functional relationship of the first line segment of the target Gamma curve of the display device includes:
if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales do not meet the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel;
determining whether each single-color sub-pixel picture of the display device meets the Gamma correction requirement;
and if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales still do not meet the Gamma correction requirement, adjusting the functional relation of the first line segment of the target Gamma curve of the display equipment.
Optionally, before determining whether the luminance value of each monochrome sub-pixel picture of the display device under the corresponding gray scale meets a preset Gamma correction requirement, the method further includes:
and performing Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and the initial target Gamma curve.
Optionally, the adjusting the initialization voltage of each single-color sub-pixel comprises:
adjusting the initialization voltage of each single-color sub-pixel from a first voltage value to a second voltage value, wherein the second voltage value is larger than the first voltage value.
Optionally, the adjusting a functional relationship of a first line segment of a target Gamma curve of the display device includes:
determining the position of a first line segment of the target Gamma curve according to the Gamma correction requirement;
and adjusting the functional relation of the first line segment at the determined position into a linear functional relation.
Optionally, the adjusting the voltage value of the single-color sub-pixel at each gray scale of the second line segment of the target Gamma curve includes:
determining the position of a second line segment of the target Gamma curve according to the Gamma correction requirement;
and adjusting the voltage value of the monochrome sub-pixel of the next gray scale to the voltage value of the monochrome sub-pixel of the previous gray scale in each gray scale of the second line segment at the determined position.
In a second aspect, the present invention provides a Gamma correction device, including:
the determining module is used for determining whether the brightness value of each single-color sub-pixel picture of the display equipment under the corresponding gray scale meets the preset Gamma correction requirement or not;
the adjusting module is used for adjusting the initialization voltage of each single-color sub-pixel when the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, and/or adjusting the voltage value of the single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display equipment;
the correction module is used for carrying out Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and an initial target Gamma curve or an adjusted target Gamma curve; the white picture is a picture when all the single-color sub-pixels in the display device are displayed simultaneously.
In a third aspect, the present invention provides an electronic device, comprising:
a memory for storing at least one set of instructions;
a processor for executing the at least one set of instructions to perform the Gamma correction method of the display device as described in any one of the above.
In a fourth aspect, the present invention provides a readable storage medium storing at least one set of instructions for causing a processor to perform a Gamma correction method for a display device as described in any one of the above.
The Gamma correction method, the Gamma correction device and the related equipment provided by the invention determine whether the brightness value of each single color sub-pixel picture of the display equipment under the corresponding gray scale meets the preset Gamma correction requirement, if the brightness value of at least one single color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, the initialization voltage of each single color sub-pixel is adjusted, and/or the function relation of the first line segment of the target Gamma curve of the display equipment is adjusted, and/or the voltage value of the single color sub-pixel under each gray scale of the second line segment of the target Gamma curve of the display equipment is adjusted, and the Gamma correction is carried out on the display equipment according to the brightness value of the white picture of the display equipment and the initial target Gamma curve or the adjusted target Gamma curve, thereby carrying out the Gamma correction based on the brightness value of the white picture of the display equipment, leading the Gamma curve of the display equipment to meet the requirement, the Gamma correction requirement of each single-color sub-pixel picture is considered, and the display effect of the display equipment is further improved.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a flowchart of a Gamma correction method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pixel circuit of a display device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an initial target Gamma curve provided in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of a target Gamma curve after adjustment of the functional relationship according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an initialization voltage and a target Gamma curve after adjustment of a functional relationship according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a target Gamma curve with adjusted initialization voltage, function relationship and gray scale voltage values according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a Gamma correction device according to an embodiment of the present 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.
Currently, different gray levels are used to represent different brightness from the darkest to the brightest. The larger the gray scale, the higher the luminance, and the smaller the luminance at the minimum gray scale. Moreover, the larger the number of gray scales is, the finer the picture that can be presented by the display device is. Generally, 8-it display devices have 0-255 gray scales, i.e. 256 gray scales.
Ideally, after the same voltage value is input to different display devices at each gray level, the luminance values output from the different display devices at each gray level are the same. That is, ideally, the input signal to output luminance ratio of different display devices is the same, or the Gamma curves of different display devices are the same.
However, in practical situations, the display performance of different display devices is different due to the influence of the variation factors such as process fluctuation, that is, after the same voltage value at each gray scale is input to different display devices, the luminance value at each gray scale output by different display devices is different. Based on this, it is necessary to correct Gamma curves of different display devices.
In addition, since the perception of human eyes to brightness changes nonlinearly, that is, the perception of human eyes to low brightness is greater than the perception of human eyes to high brightness, in order to improve the effect of the display image viewed by human eyes, the Gamma curve of the display device also needs to be corrected to the Gamma curve which changes nonlinearly and meets the requirement of the change of the perception of human eyes.
At present, the Gamma curve of the display device is corrected to be a uniform target Gamma curve. The Gamma value of the target Gamma curve is generally between 2.2 and 2.5. In addition, Gamma correction is performed based on the luminance values of the white picture at each gray level, which are obtained by mixing and displaying the sub-pixels of each color of the display device in a white balance ratio.
However, under the influence of process factors and white balance proportion, the Gamma correction effect of the white picture cannot be equal to that of each single-color picture, so that the Gamma correction effect of each single-color picture cannot be considered in the current Gamma correction mode, and the Gamma correction effect of the single-color picture cannot meet the requirement.
For example, after Gamma correction is performed based on the luminance value of the white picture at each gray level, the lighting gray level of the monochrome picture is 30, and if the lighting gray level of the monochrome picture is required to be 15, the Gamma correction effect of the monochrome picture cannot meet the requirement. The lighting gray scale refers to the gray scale of the initial brightness of the display device, which can be perceived by human eyes, for converting from the black state to the white state.
Based on the above, the present invention provides a Gamma correction scheme, which adjusts the initialization voltage of each monochromatic sub-pixel, and/or adjusts the functional relationship of the corresponding line segment of the target Gamma curve of the display device, and/or adjusts the voltage value of the monochromatic sub-pixel under each gray scale in the corresponding line segment of the target Gamma curve, according to the Gamma correction requirement of the monochromatic picture, so as to meet the Gamma correction requirement of each monochromatic picture.
As an optional implementation of the disclosure of the present invention, an embodiment of the present invention provides a Gamma correction method, which is used for performing Gamma correction on a display device. The display device may be a liquid crystal display device, an LED display device, an OLED display device, or the like.
As shown in fig. 1, fig. 1 is a flowchart of a Gamma correction method according to an embodiment of the present invention, where the Gamma correction method includes:
s101: determining whether the brightness value of each single-color sub-pixel picture of the display equipment under the corresponding gray scale meets the preset Gamma correction requirement or not; if the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, entering S102;
wherein each single-color sub-pixel picture refers to a picture when sub-pixels of each color in the display device are individually displayed. For example, each single color sub-pixel is a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and when the red sub-pixel, the green sub-pixel, and the blue sub-pixel are individually displayed, the single color sub-pixel pictures are a red picture, a green picture, and a blue picture, respectively. In this case, the luminance value of the picture displayed by the display device may be detected by using a light intensity detector or the like.
The Gamma correction requirement comprises the brightness requirement of each single-color sub-pixel picture under at least one gray scale. For example, the preset Gamma correction requires that the brightness gray scale of each monochrome sub-pixel picture is 15, that is, the brightness value of each monochrome sub-pixel picture at 15 gray scales is required to reach the brightness that can be perceived by human eyes.
S102: if the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, adjusting the initialization voltage of each single-color sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, and/or adjusting the voltage value of the single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display equipment;
since the characteristics, aperture ratio, and light emitting efficiency of the sub-pixels of different colors are different, the luminance values of the sub-pixels of different colors at different gray scales are also different. Therefore, under the condition that the brightness values of the single-color sub-pixel pictures at the corresponding gray scales are not adjusted, the brightness values of different single-color sub-pixel pictures at the corresponding gray scales cannot simultaneously meet the same Gamma correction requirement. The luminance values of a part of monochrome sub-pixel images at corresponding gray scales may not satisfy the Gamma correction requirement, and the luminance values of all monochrome sub-pixel images at corresponding gray scales may not satisfy the Gamma correction requirement.
If the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales meet the Gamma correction requirement, the correction of each monochrome sub-pixel picture is not needed. If the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, the brightness value of each single-color sub-pixel picture under the corresponding gray scale can be adjusted by adjusting the initialization voltage of each single-color sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display device, and/or adjusting the voltage value of each single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display device, so that the brightness values of all the single-color sub-pixel pictures under the corresponding gray scale can meet the Gamma correction requirement. Wherein the voltage value of the single-color sub-pixel may be a voltage value received by the anode of the single-color sub-pixel.
S103: and performing Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and the initial target Gamma curve or the adjusted target Gamma curve.
Wherein, the white picture is the picture when all the single-color sub-pixels in the display device are displayed simultaneously. For example, a white screen is obtained when red, green, and blue sub-pixels are simultaneously displayed. It can be understood that, the red sub-pixel, the green sub-pixel and the blue sub-pixel with different gray scales can be mixed to obtain the white pixel with different gray scales, and the plurality of white pixels in the display device can constitute the white picture.
In the embodiment of the invention, if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales meet the Gamma correction requirement only by adjusting the initialization voltage of each monochrome sub-pixel, the Gamma correction can be carried out on the display equipment according to the brightness values of the white pictures of the display equipment under each gray scale and the initial target Gamma curve after the initialization voltage of each monochrome sub-pixel is adjusted.
If the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales meet the Gamma correction requirement by adjusting the initialization voltage of each monochrome sub-pixel and adjusting the functional relation of a first line segment of a target Gamma curve of the display device and/or adjusting the voltage values of the monochrome sub-pixels under each gray scale of a second line segment of the target Gamma curve of the display device, the Gamma correction is carried out on the display device according to the brightness values of the white pictures of the display device under each gray scale and the adjusted target Gamma curve.
In the embodiment of the invention, after determining whether the brightness value of each single-color sub-pixel picture of the display device under the corresponding gray scale meets the preset Gamma correction requirement, if the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, the initialization voltage of each single-color sub-pixel is adjusted, and/or the functional relation of the first line segment of the target Gamma curve of the display device is adjusted, and/or the voltage value of the single-color sub-pixel under the corresponding gray scale of the target Gamma curve of the display device is adjusted, and the Gamma correction is carried out on the display device according to the brightness value of the white picture of the display device under each gray scale and the target Gamma curve, so that the Gamma correction can be carried out on the white picture of the display device under each gray scale, the Gamma correction of the display device meets the requirement, and simultaneously considers the Gamma correction requirement of each single-color sub-pixel picture, the display effect of the display device is further improved.
In some embodiments of the present invention, after the display device is manufactured, the luminance values of the monochrome sub-pixel images of the display device at the corresponding gray levels are measured, and it is determined whether the luminance values of the monochrome sub-pixel images of the display device at the corresponding gray levels meet the preset Gamma correction requirement.
The measuring of the brightness value of each single-color sub-pixel picture of the display device under the corresponding gray scale comprises the following steps: and respectively applying voltage values under corresponding gray scales to the single-color sub-pixels of the display equipment, and measuring the brightness values under the corresponding gray scales when the display equipment displays the single-color sub-pixel pictures of all colors.
Of course, the present invention is not limited to this, and in other embodiments, after the display device is manufactured, and the Gamma correction is performed on the display device according to the luminance value of the white image of the display device and the initial target Gamma curve, the luminance value of each single-color sub-pixel image of the display device at the corresponding gray scale is measured, and it is determined whether the luminance value of each single-color sub-pixel image of the display device at the corresponding gray scale meets the preset Gamma correction requirement.
Because the brightness value of at least one single-color sub-pixel picture at the corresponding gray scale does not meet the Gamma correction requirement, the brightness values of all the single-color sub-pixel pictures at the corresponding gray scale do not meet the Gamma correction requirement, and the brightness values of part of the single-color sub-pixel pictures at the corresponding gray scale do not meet the Gamma correction requirement, in some embodiments of the invention, when the brightness values of all the single-color sub-pixel pictures at the corresponding gray scale do not meet the Gamma correction requirement, the brightness values of all the single-color sub-pixel pictures at the corresponding gray scale are synchronously adjusted by adjusting the initialization voltage of all the single-color sub-pixels and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, so as to reduce the adjustment time and improve the adjustment efficiency; when the brightness value of part of the monochrome sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, the brightness value of the part of the monochrome sub-pixel picture under the corresponding gray scale is accurately adjusted by adjusting the voltage value of the monochrome sub-pixel under each gray scale of the second line segment of the target Gamma curve of the display device.
On the basis, in some embodiments of the present invention, if the luminance values of all the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, the initialization voltage of each monochrome sub-pixel may be adjusted first, then it is determined whether each monochrome sub-pixel picture of the display device satisfies the Gamma correction requirement, if the luminance values of all the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, the functional relationship of the first line segment of the target Gamma curve of the display device is adjusted, and if the luminance values of some monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, the voltage values of some monochrome sub-pixels at each gray scale of the second line segment of the target Gamma curve of the display device are adjusted.
Of course, in other embodiments, if the luminance values of all the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, the functional relationship of the first line segment of the target Gamma curve of the display device may be adjusted, and then it is determined whether each of the monochrome sub-pixel pictures of the display device satisfies the Gamma correction requirement, if the luminance values of all the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, the initialization voltage of each of the monochrome sub-pixels is adjusted, and if the luminance values of some of the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, the voltage values of some of the monochrome sub-pixels at each gray scale of the second line segment of the target Gamma curve of the display device are adjusted.
It should be noted that, in some embodiments, the initialization voltage of each single-color sub-pixel may be adjusted multiple times, and the functional relationship of the first line segment of the target Gamma curve of the display device may be adjusted multiple times until the luminance value of at least one single-color sub-pixel picture at the corresponding gray scale meets the Gamma correction requirement.
In some embodiments of the present invention, adjusting the initialization voltage of each monochrome sub-pixel comprises: the initialization voltage of each single-color sub-pixel is adjusted from a first voltage value to a second voltage value, and the second voltage value is larger than the first voltage value.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a pixel circuit of a display device according to an embodiment of the present invention, where the pixel circuit is used for providing a voltage signal to a sub-pixel OLED. The Vdata voltage controls the voltage of the anode of the sub-pixel OLED by controlling the output current of the driving transistor, and further controls the sub-pixel OLED to emit light rays with corresponding brightness. The different voltage values of the Vdata voltage correspond to the voltage values received by the sub-pixel OLED under different gray scales.
Vref is an initialization voltage, and before the Vdata voltage is transmitted to the anode of the sub-pixel OLED, the initialization voltage Vref needs to be transmitted to the anode of the sub-pixel OLED, so that the initialization voltage Vref and the voltage remaining at the anode are offset, and the anode is initialized.
By adjusting the initialization voltage Vref of the sub-pixel OLED from the first voltage value to the second voltage value, that is, by increasing the initialization voltage Vref of the sub-pixel OLED, the initialization efficiency of the anode of the sub-pixel OLED can be improved, the brightness value of the sub-pixel OLED is improved, and thus the brightness value of each single-color sub-pixel picture can be improved, and the brightness value of each single-color sub-pixel picture can meet the Gamma correction requirement.
For example, the Gamma correction requires that the brightness of each monochrome sub-pixel picture at the corresponding gray scale is 15 gray scales, and the brightness of each monochrome sub-pixel picture at the corresponding gray scale is 30 gray scales, so that the initialization voltage of each monochrome sub-pixel can be increased from about-4V to about-2V.
Of course, the present invention is not limited to this, and in other embodiments, the initialization voltage of each monochrome sub-pixel may be adjusted to be lower, and the initialization voltage adjustment manner of each monochrome sub-pixel may be specifically set according to the Gamma correction requirement, which is not described herein again.
In some embodiments of the present invention, adjusting the functional relationship of the first segment of the target Gamma curve of the display device comprises: determining the position of a first line segment of a target Gamma curve according to the Gamma correction requirement; and adjusting the functional relation of the first line segment at the determined position into a linear functional relation.
For example, the Gamma correction requires that the brightness of each monochrome sub-pixel picture in the brightness value under the corresponding gray scale is 15 gray scales, and the brightness of each monochrome sub-pixel picture in the brightness value under the corresponding gray scale is 30 gray scales, then the position of the first line segment is determined to be between 0 gray scale and 30 gray scales, and then the functional relationship of the line segment between 0 gray scale and 30 gray scale of the target Gamma curve can be adjusted to be a linear functional relationship, and the functional relationship of other gray scales of the target Gamma curve, i.e. the line segment between 31 gray scale and 255 gray scale, remains unchanged and is still a non-linear functional relationship, for example, the non-linear functional relationship of the Gamma curve with the Gamma equal to 2.2.
As shown in fig. 3, fig. 3 is a schematic diagram of an initial target Gamma curve according to an embodiment of the present invention, in which the functional relationship of a line segment of the target Gamma curve between 0 gray level and 255 gray level is a nonlinear functional relationship. As shown in fig. 4, fig. 4 is a schematic diagram of a target Gamma curve after function adjustment according to an embodiment of the present invention, in which the function relationship of a line segment of the target Gamma curve between 0 gray scale and 30 gray scale is a linear function relationship, the function relationship of a line segment between 31 gray scale and 255 gray scale is a nonlinear function relationship, and the starting gray scale of each monochrome sub-pixel picture, i.e., the blue picture, the green picture and the red picture, is changed from 30 gray scale to 25 gray scale.
Therefore, the functional relation of the line segment between the 0 gray scale and the 30 gray scale is adjusted to be linear functional relation, so that the brightness value between the 0 gray scale and the 30 gray scale can be improved, and the brightness value smaller than the 30 gray scale can reach the initial brightness value.
In some embodiments of the present invention, the functional relationship of the first line segment of the target Gamma curve of the display device may be directly adjusted, or the functional relationship of the first line segment of the target Gamma curve of the display device may be adjusted on the basis of adjusting the initialization voltage of each single-color sub-pixel, or the initialization voltage of each single-color sub-pixel may be adjusted on the basis of adjusting the functional relationship of the first line segment of the target Gamma curve of the display device. As shown in fig. 5, fig. 5 is a schematic diagram of the target Gamma curve after the initialization voltage and the function relation adjustment according to an embodiment of the present invention, and the lighting gray scale of each single-color sub-pixel picture, i.e., the blue picture, the green picture and the red picture, is changed from 30 gray scale to 15 gray scale.
In some embodiments of the present invention, adjusting the voltage values of the respective gray levels of the second segment of the target Gamma curve comprises: determining the position of a second line segment of the target Gamma curve according to the Gamma correction requirement; and adjusting the voltage value of the single-color sub-pixel of the later gray scale to the voltage value of the single-color sub-pixel of the previous gray scale in each gray scale of the second line segment at the determined position.
For example, the Gamma correction requires that the brightness value of each monochrome sub-pixel picture at the corresponding gray scale is 15 gray scales, and the brightness value of each monochrome sub-pixel picture at the corresponding gray scale is 30 gray scales, then the position of the second line segment is determined to be between 0 gray scale and 30 gray scales, and then the voltage value of the monochrome sub-pixel at the next gray scale can be adjusted to the voltage value of the monochrome sub-pixel at the previous gray scale from 0 gray scale to 30 gray scales. For example, a voltage value of 30 gray scales is assigned to 29 gray scales, a voltage value of 29 gray scales is assigned to 28 gray scales, and so on.
Of course, in some embodiments, the voltage values of the gray levels may be adjusted according to the gray level binding points of the Gamma curve, for example, if the gray level binding points of the 0 gray level to the 30 gray level are respectively the 0 gray level, the 2 gray level, the 4 gray level, and the 6 gray level … 30 gray level, the voltage value of the next gray level is adjusted to the voltage value of the previous gray level, the voltage value of the 30 gray level is assigned to the 28 gray level, the voltage value of the 28 gray level is assigned to the 26 gray level, and so on until the voltage value of the 2 gray level is assigned to the 0 gray level.
Therefore, the voltage value of the next gray scale is adjusted to the voltage value of the previous gray scale, so that the voltage value of the previous gray scale, namely the low gray scale can be increased, the brightness value of the low gray scale can be increased, and the brightness value of the low gray scale, such as 15 gray scales, can reach the initial brightness value.
In some embodiments of the present invention, the voltage value of each gray scale of the monochrome sub-pixel picture of the corresponding color can be adjusted by adjusting the assignment of the register under each gray scale corresponding to the sub-pixel of any color. For example, the voltage value of the subsequent gray scale may be adjusted to the voltage value of the previous gray scale by assigning the value of the register of the subsequent gray scale to the register of the previous gray scale.
In some embodiments of the present invention, the voltage values of the respective gray scales of the second segment of the target Gamma curve may be directly adjusted, or the voltage values of the respective gray scales of the second segment of the target Gamma curve may be further adjusted on the basis of adjusting the initialization voltage of the respective monochrome sub-pixels and/or adjusting the functional relationship of the first segment of the target Gamma curve of the display device.
As shown in fig. 6, fig. 6 is a schematic diagram of a target Gamma curve after the initialization voltage, the function relationship and the voltage values of the gray scales are adjusted according to an embodiment of the present invention, and the starting gray scales of the monochrome sub-pixel frames, i.e., the blue frame, the green frame and the red frame, are changed from 30 gray scales to 5 gray scales.
It should be noted that, in some embodiments of the present invention, when performing Gamma correction on the display device according to the luminance value of the white image of the display device and the initial target Gamma curve or the adjusted target Gamma curve, the Gamma curve of the display device may be adjusted by adjusting the voltage value received by the anode of the sub-pixel, adjusting the proportional relationship between the voltage value and the luminance value, and further adjusting the Gamma curve of the display device.
As another optional implementation of the disclosure, an embodiment of the present invention provides a Gamma correction apparatus, which is used for performing Gamma correction on a display device. As shown in fig. 7, fig. 7 is a schematic structural diagram of a Gamma correction device according to an embodiment of the present invention, where the Gamma correction device includes:
the determining module 70 is configured to determine whether a luminance value of each single-color sub-pixel picture of the display device under a corresponding gray scale meets a preset Gamma correction requirement;
the adjusting module 71 is configured to, when the luminance value of at least one monochrome sub-pixel picture at the corresponding gray scale does not satisfy the Gamma correction requirement, adjust the initialization voltage of each monochrome sub-pixel, and/or adjust the functional relationship of the first line segment of the target Gamma curve of the display device, and/or adjust the voltage value of the monochrome sub-pixel at each gray scale of the second line segment of the target Gamma curve of the display device;
a correcting module 72, configured to perform Gamma correction on the display device according to the brightness value of the white picture of the display device and the initial target Gamma curve or the adjusted target Gamma curve; a white picture is a picture when all the monochrome sub-pixels in the display device are displayed simultaneously.
In the Gamma correction apparatus of the present invention, after the determining module 70 determines whether the luminance value of each single-color sub-pixel picture of the display device at the corresponding gray scale meets the preset Gamma correction requirement, if the luminance value of at least one single-color sub-pixel picture at the corresponding gray scale does not meet the Gamma correction requirement, the adjusting module 71 adjusts the initialization voltage of each single-color sub-pixel, and/or adjusts the function relationship of the first line segment of the target Gamma curve of the display device, and/or adjusts the voltage value of the single-color sub-pixel at each gray scale of the second line segment of the target Gamma curve of the display device, the correcting module 72 performs Gamma correction on the display device according to the luminance value of the white picture of the display device at each gray scale and the target Gamma curve, so as to perform Gamma correction based on the luminance value of the white picture of the display device at each gray scale, the Gamma curve of the display equipment meets the requirement, simultaneously considers the Gamma correction requirement of each single-color sub-pixel picture, and further improves the display effect of the display equipment.
In some embodiments of the present invention, the adjusting module 71 is configured to adjust an initialization voltage of each monochrome sub-pixel when the luminance values of all the monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, and/or adjust a functional relationship of a first line segment of a target Gamma curve of the display device, and adjust the voltage value of the monochrome sub-pixel at each gray scale of a second line segment of the target Gamma curve of the display device when the luminance values of some monochrome sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement.
In some embodiments of the present invention, the adjusting module 71 is configured to adjust the initialization voltage of each single-color sub-pixel when the luminance values of all the single-color sub-pixel pictures at the corresponding gray scales do not satisfy the Gamma correction requirement, and then send a determination instruction to the determining module 70, so that the determining module 70 determines whether each single-color sub-pixel picture of the display device satisfies the Gamma correction requirement, and adjusts the functional relationship of the first line segment of the target Gamma curve of the display device when the luminance values of all the single-color sub-pixel pictures at the corresponding gray scales still do not satisfy the Gamma correction requirement.
In some embodiments of the present invention, before the determining module 70 determines whether the luminance value of each single-color sub-pixel image of the display device at the corresponding gray scale meets the preset Gamma correction requirement, the correcting module 72 is further configured to perform Gamma correction on the display device according to the luminance value of the white image of the display device at each gray scale and the initial target Gamma curve.
In some embodiments of the present invention, the adjusting module 71 adjusts the initialization voltage of each single-color sub-pixel, including:
the initialization voltage of each single-color sub-pixel is adjusted from a first voltage value to a second voltage value, and the second voltage value is larger than the first voltage value.
In some embodiments of the present invention, the adjusting module 71 adjusts a functional relationship of a first line segment of a target Gamma curve of a display device, where the functional relationship includes:
determining the position of a first line segment of a target Gamma curve according to the Gamma correction requirement;
the functional relationship of the first line segment at the determined position is adjusted to a linear functional relationship.
In some embodiments of the present invention, the adjusting module 71 adjusts the voltage values of the respective gray levels of the second segment of the target Gamma curve, including:
determining the position of a second line segment of the target Gamma curve according to the Gamma correction requirement;
and adjusting the voltage value of the single-color sub-pixel of the later gray scale to the voltage value of the single-color sub-pixel of the former gray scale in each gray scale of the second line segment at the determined position.
As another optional implementation of the disclosure, an embodiment of the present invention provides an electronic device, which may be a terminal device or a server device. The electronic device includes:
a memory for storing at least one set of instructions;
the processor is used for executing at least one set of instructions to execute the Gamma correction method provided by any one of the above embodiments.
As another alternative implementation of the disclosure, an embodiment of the present invention provides a readable storage medium, where the readable storage medium stores at least one set of instructions, and the at least one set of instructions is configured to cause a processor to execute the Gamma correction method provided in any of the above embodiments.
Readable storage media, including both permanent and non-permanent, removable and non-removable media, of embodiments of the present invention may implement information storage by any method or technology. The information may be host-readable instructions, data structures, modules of a program, or other data. Examples of storage media for the host include, but are not limited to, phase change memory (PAM), static random access memory (SAM), dynamic random access memory (DAM), other types of random Access Memory (AM), read Only Memory (OM), electrically erasable programmable read only memory (EEPOM), flash memory or other memory technology, compact disc read only memory (CD-OM), Digital Versatile Disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A Gamma correction method is characterized by comprising the following steps:
determining whether the brightness value of each single-color sub-pixel picture of the display equipment under the corresponding gray scale meets the preset Gamma correction requirement or not;
if the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, adjusting the initialization voltage of each single-color sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, and/or adjusting the voltage value of each single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display equipment;
performing Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and the initial target Gamma curve or the adjusted target Gamma curve; the white picture is a picture when all the single-color sub-pixels in the display device are displayed simultaneously.
2. The Gamma correction method of claim 1, wherein if the luminance value of at least one monochrome sub-pixel image at the corresponding gray level does not satisfy the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel, and/or adjusting the functional relationship of the first line segment of the target Gamma curve of the display device, and/or adjusting the voltage value of the monochrome sub-pixel at each gray level of the second line segment of the target Gamma curve of the display device, comprises:
if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales do not meet the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment;
and if the brightness value of part of the monochrome sub-pixel pictures at the corresponding gray scale does not meet the Gamma correction requirement, adjusting the voltage value of the monochrome sub-pixel at each gray scale of the second line segment of the target Gamma curve of the display equipment.
3. The Gamma correction method of claim 2, wherein if the luminance values of all the monochrome sub-pixel images at the corresponding gray levels do not satisfy the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel, and/or adjusting the functional relationship of the first line segment of the target Gamma curve of the display device comprises:
if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales do not meet the Gamma correction requirement, adjusting the initialization voltage of each monochrome sub-pixel;
determining whether each single-color sub-pixel picture of the display device meets the Gamma correction requirement;
and if the brightness values of all the monochrome sub-pixel pictures under the corresponding gray scales still do not meet the Gamma correction requirement, adjusting the functional relation of the first line segment of the target Gamma curve of the display equipment.
4. The Gamma correction method of claim 1, wherein before determining whether the luminance values of the respective monochrome sub-pixel pictures of the display device at the corresponding gray levels satisfy the preset Gamma correction requirement, the method further comprises:
and performing Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and the initial target Gamma curve.
5. The Gamma correction method of claim 1, wherein the adjusting the initialization voltage of each single-color sub-pixel comprises:
and adjusting the initialization voltage of each single-color sub-pixel from a first voltage value to a second voltage value, wherein the second voltage value is larger than the first voltage value.
6. The Gamma correction method of claim 1, wherein the adjusting the functional relationship of the first segment of the target Gamma curve of the display device comprises:
determining the position of a first line segment of the target Gamma curve according to the Gamma correction requirement;
and adjusting the functional relation of the first line segment at the determined position into a linear functional relation.
7. The Gamma correction method of claim 5, wherein the adjusting the voltage values of the monochrome sub-pixels at respective gray levels of the second segment of the target Gamma curve comprises:
determining the position of a second line segment of the target Gamma curve according to the Gamma correction requirement;
and adjusting the voltage value of the single-color sub-pixel of the later gray scale to the voltage value of the single-color sub-pixel of the previous gray scale in each gray scale of the second line segment at the determined position.
8. A Gamma correction device, comprising:
the determining module is used for determining whether the brightness value of each single-color sub-pixel picture of the display equipment under the corresponding gray scale meets the preset Gamma correction requirement or not;
the adjusting module is used for adjusting the initialization voltage of each single-color sub-pixel when the brightness value of at least one single-color sub-pixel picture under the corresponding gray scale does not meet the Gamma correction requirement, and/or adjusting the functional relation of a first line segment of a target Gamma curve of the display equipment, and/or adjusting the voltage value of the single-color sub-pixel under each gray scale of a second line segment of the target Gamma curve of the display equipment;
the correction module is used for carrying out Gamma correction on the display equipment according to the brightness value of the white picture of the display equipment and an initial target Gamma curve or an adjusted target Gamma curve; the white picture is a picture when all the single-color sub-pixels in the display device are displayed simultaneously.
9. An electronic device, comprising:
a memory for storing at least one set of instructions;
a processor for executing the at least one set of instructions to perform the Gamma correction method of any of claims 1 to 7.
10. A readable storage medium storing at least one set of instructions for causing a processor to perform the Gamma correction method of any one of claims 1 to 7.
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