CN110910847B - Gamma correction method and device for display module - Google Patents
Gamma correction method and device for display module Download PDFInfo
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- CN110910847B CN110910847B CN201911165645.XA CN201911165645A CN110910847B CN 110910847 B CN110910847 B CN 110910847B CN 201911165645 A CN201911165645 A CN 201911165645A CN 110910847 B CN110910847 B CN 110910847B
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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
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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
Abstract
The embodiment of the invention provides a gamma correction method and a gamma correction device of a display module, wherein the gamma correction method comprises the following steps: for each current target binding point to be adjusted of the display module, executing the following adjusting process: driving a display module to light by adopting the initial correction value of the RGB register; acquiring initial brightness information and initial color coordinate information from a display module by using a color analyzer; synchronously adjusting the correction value of the RGB register according to the initial brightness information, and respectively adjusting the correction value of the RB register according to the initial color coordinate information; writing the adjusted correction value into an RGB register; the adjustment times of the correction values of the registers and the step values of each adjustment are determined by the change rate of the color information of the display module along with the register values, and the color information comprises brightness information or color coordinate information. The invention respectively adjusts the brightness and the color coordinate based on the display module, and solves the problems of poor self-adaption and time consumption of the traditional gamma correction method.
Description
Technical Field
The invention relates to the technical field of display, in particular to a gamma correction method and device for a display module.
Background
The output brightness of the liquid crystal display panel and the input voltage are in a nonlinear relation, the nonlinear relation between the output brightness and the input voltage is represented by a gamma curve in the display field, and the given gamma curve is used for determining the input voltage of the display module according to the output brightness. However, in the manufacturing process, the gamma curve varies due to the process variation and the difference of the used materials, so that the display effect of the display module is deteriorated. Gamma correction is to adjust the register value of each binding point in the display driving integrated circuit to make the input voltage and the output brightness satisfy the nonlinear relation represented by the given gamma curve: and L is the output brightness, a is the input gray level, C is the module constant, and r is the module index.
In the prior art, a search algorithm is adopted to perform gamma correction, and specifically, an adjustment range of a register value is given firstly; then, respectively obtaining the adjusted numerical values of the respective registers of RGB according to a search algorithm so as to enable the brightness to meet the requirements; and finally, fine-tuning the RGB register values of the binding points to enable the three colors to be displayed together to achieve white balance. The technology has poor self-adaptability; in addition, when white balance is adjusted, that is, when the color temperature is adjusted after the brightness meets the condition, the G component needs to be changed, and the contribution of the G component to the brightness is large, which causes that the adjusted brightness cannot meet the requirement, so that multiple iterations are required, and the adjustment time is prolonged.
Therefore, the conventional gamma correction method for the display module has the technical defect of long adjustment time and is time-consuming. The technical problems of poor self-adaption and time consumption of the traditional gamma correction method for the display module are solved, and an effective solution is not available at present.
Disclosure of Invention
In view of this, embodiments of the present invention provide a gamma correction method and device for a display module, which can quickly and effectively correct a gamma curve of the display module, so that the display module achieves a better display effect.
According to a first aspect of the present invention, there is provided a gamma correction method for a display module, the method performs the following adjustment process for each current target binding point of the display module to be adjusted:
driving the display module to light by adopting the initial correction value of the RGB register;
acquiring initial brightness information and initial color coordinate information from the display module by using a color analyzer;
synchronously adjusting the correction value of an RGB register according to the initial brightness information, and respectively adjusting the correction value of an RB register according to the initial color coordinate information;
and writing the adjusted correction value into the RGB register.
Optionally, the synchronously adjusting the rectification values of the RGB registers according to the initial luminance information, and respectively adjusting the rectification values of the RB registers according to the initial color coordinate information, includes:
judging whether the initial brightness information exceeds a target brightness range;
under the condition that the initial brightness information exceeds the target brightness range, synchronously adjusting the correction value of the RGB register;
and under the condition that the initial brightness information does not exceed the target brightness range, judging whether the initial color coordinate information exceeds the target color coordinate range, and under the condition that the initial color coordinate information exceeds the target color coordinate range, respectively adjusting the correction value of an RB register.
Optionally, in the case that the initial brightness information exceeds the target brightness range, synchronously adjusting the rectification values of the RGB registers includes:
when the initial brightness information is larger than the maximum value of the target brightness range, reducing the correction value of the RGB register by the same step length;
and when the initial brightness information is smaller than the minimum value of the target brightness range, increasing the rectification value of the RGB register by the same step length.
Optionally, the initial color coordinate information includes an initial color coordinate x and an initial color coordinate y, and the target color coordinate range includes a target color coordinate x range and a target color coordinate y range;
respectively adjusting the correction values of the RB registers under the condition that the initial color coordinate information exceeds the target color coordinate range, wherein the method comprises the following steps: adjusting a rectification value of an R register if the initial color coordinate x exceeds the target color coordinate x range, and adjusting a rectification value of a B register if the initial color coordinate y exceeds the target color coordinate y range.
Optionally, the adjusting process of the register leveling value comprises:
acquiring the change rate of the color information of the display module along with the register value at the initial color information;
obtaining an adjustment value of the initial color information which is adjusted back to a target range;
determining a step value from the rate of change and the adjustment value to adjust a corrective value of a register by the step value,
wherein the initial color information includes the initial brightness information or the initial color coordinate information, and the target range includes a target brightness range or a target color coordinate range.
Optionally, determining a step value according to the rate of change and the adjustment value comprises:
determining a step length threshold according to the change amplitude of the color information of the display module along with the change rate of the register value;
judging whether the ratio of the adjusting value to the change rate is larger than the step length threshold value or not;
and if the ratio is not larger than the step length threshold value, adjusting the correction value of the register back to be within the target range by one step, wherein the step value of the step is the ratio.
Optionally, the method further comprises: in the event that the ratio is greater than the stride length threshold, adjusting a register fix value in multiple steps until the initial color information is recalled to the target range, wherein,
before the register correction value is adjusted in each step, the current change rate of the color information of the display module along with the register value at the current color information is obtained;
determining a current stepping reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step;
and determining the current step value of the current step as the step reference value under the condition that the step reference value is not larger than the step threshold value, otherwise, determining the current step value as the step threshold value.
Optionally, determining a current step reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step includes:
determining the stepping reference value at the current change rate when the register value is adjusted in the first step;
when the register value is adjusted in the second step, the stepping reference value is determined according to the current conversion rate and the previous step change rate;
the step reference value is determined at the current rate of change and the rates of change of the first two steps as the register values are adjusted at the third and subsequent steps.
Optionally, determining a current step reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step includes:
determining the current change rate and the weight of the change rate of each preset step according to the change amplitude of the color information of the display module along with the change rate of the register value;
calculating a weighted sum of the current rate of change and a rate of change of a previous preset step based on the weight;
and determining the stepping reference value through the weighted sum and the current color information of the target binding point.
According to a second aspect of the present invention, there is provided a gamma correction device for a display module, comprising: the device comprises a driving module, an acquisition module, an adjustment module and a writing module, wherein for each current target binding point to be adjusted of the display module,
the driving module is used for driving the display module to be lightened by adopting the initial correction value of the RGB register;
the acquisition module is used for acquiring initial brightness information and initial color coordinate information from the display module through a color analyzer;
the adjusting module is used for synchronously adjusting the correction value of the RGB register according to the initial brightness information and respectively adjusting the correction value of the RB register according to the initial color coordinate information;
and the writing module is used for writing the adjusted correction value into the RGB register.
Optionally, the adjusting module is configured to:
judging whether the initial brightness information exceeds a target brightness range;
under the condition that the initial brightness information exceeds the target brightness range, synchronously adjusting the correction value of the RGB register;
and under the condition that the initial brightness information does not exceed the target brightness range, judging whether the initial color coordinate information exceeds the target color coordinate range, and under the condition that the initial color coordinate information exceeds the target color coordinate range, respectively adjusting the correction value of an RB register.
Optionally, the adjusting module is configured to:
when the initial brightness information is larger than the maximum value of the target brightness range, reducing the correction value of the RGB register by the same step length;
and when the initial brightness information is smaller than the minimum value of the target brightness range, increasing the rectification value of the RGB register by the same step length.
Optionally, the initial color coordinate information includes an initial color coordinate x and an initial color coordinate y, and the target color coordinate range includes a target color coordinate x range and a target color coordinate y range;
the adjustment module is configured to: adjusting a rectification value of an R register if the initial color coordinate x exceeds the target color coordinate x range, and adjusting a rectification value of a B register if the initial color coordinate y exceeds the target color coordinate y range.
Optionally, the adjusting module is configured to:
acquiring the change rate of the color information of the display module along with the register value at the initial color information;
obtaining an adjustment value of the initial color information which is adjusted back to a target range;
determining a step value from the rate of change and the adjustment value to adjust a corrective value of a register by the step value,
wherein the initial color information includes the initial brightness information or the initial color coordinate information, and the target range includes a target brightness range or a target color coordinate range.
Optionally, the adjusting module is configured to:
determining a step length threshold according to the change amplitude of the color information of the display module along with the change rate of the register value;
judging whether the ratio of the adjusting value to the change rate is larger than the step length threshold value or not;
and if the ratio is not larger than the step length threshold value, adjusting the correction value of the register back to be within the target range by one step, wherein the step value of the step is the ratio.
Optionally, the adjusting module is further configured to:
in the event that the ratio is greater than the stride length threshold, adjusting a register fix value in multiple steps until the initial color information is recalled to the target range, wherein,
before the register correction value is adjusted in each step, the current change rate of the color information of the display module along with the register value at the current color information is obtained;
determining a current stepping reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step;
and determining the current step value of the current step as the step reference value under the condition that the step reference value is not larger than the step threshold value, otherwise, determining the current step value as the step threshold value.
Optionally, the adjusting module is configured to:
determining the stepping reference value at the current change rate when the register value is adjusted in the first step;
when the register value is adjusted in the second step, the stepping reference value is determined according to the current conversion rate and the previous step change rate;
the step reference value is determined at the current rate of change and the rates of change of the first two steps as the register values are adjusted at the third and subsequent steps.
Optionally, the adjusting module is configured to:
determining the current change rate and the weight of the change rate of each preset step according to the change amplitude of the color information of the display module along with the change rate of the register value;
calculating a weighted sum of the current rate of change and a rate of change of a previous preset step based on the weight;
and determining the stepping reference value through the weighted sum and the current color information of the target binding point.
The embodiment of the invention has the following advantages or beneficial effects:
the invention collects the initial brightness information and the initial color coordinate information from the display module, synchronously adjusts the correction value of the RGB register according to the initial brightness information, and adjusting the correction value of the RB register according to the initial color coordinate information, wherein the adjustment times of the correction value of each register and the step value of each adjustment are determined by the change rate of the color information of the display module along with the register value, because the correction value of the register is adjusted based on the self information of the display module, the self-adaptive display module has stronger self-adaptive characteristic, and the adjustment of the brightness information and the color coordinate information is respectively carried out on each current target binding point to be adjusted of the display module, therefore, the calibration rework phenomenon caused by three-color adjustment and white balance adjustment in the traditional adjustment method is avoided, the gamma curve of the display module is quickly and effectively corrected, and the technical problems of poor self-adaption and time consumption of the traditional gamma correction method are solved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing embodiments of the present invention with reference to the following drawings, in which:
FIG. 1 is a flowchart illustrating a gamma correction method for a display module according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a CIE-xy chromaticity diagram;
FIG. 3 is a flow chart illustrating a method for adjusting a register leveling value according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a method for determining a step value according to a first embodiment of the present invention;
FIG. 5 is a block diagram of a gamma correction device of a display module according to a second embodiment of the invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, and procedures have not been described in detail so as not to obscure the present invention. The figures are not necessarily drawn to scale.
Fig. 1 is a flowchart of a gamma correction method for a display module according to the present invention, and referring to fig. 1, for each current target binding point of the display module to be adjusted, the following adjustment process is performed:
and S101, driving a display module to light by adopting the initial correction value of the RGB register.
And step S102, acquiring initial brightness information and initial color coordinate information from the display module by using a color analyzer.
And step S103, synchronously adjusting the correction values of the RGB registers according to the initial brightness information, and respectively adjusting the correction values of the RB registers according to the initial color coordinate information.
Step S104, writing the adjusted correction value into an RGB register;
the adjustment times of the correction values of the registers and the step values of each adjustment are determined by the change rate of the color information of the display module along with the register values, and the color information comprises brightness information or color coordinate information.
According to the gamma correction method for the display module, provided by the embodiment of the invention, after the initial brightness information and the initial color coordinate information are collected from the display module, the correction values of the RGB registers are synchronously adjusted according to the initial brightness information, the correction values of the RB registers are respectively adjusted according to the initial color coordinate information, and the adjustment times of the correction values of the registers and the step value of each adjustment are determined by the change rate of the color information of the display module along with the register values. The correction value of the register is adjusted based on the self information of the display module, so that the self-adaptive gamma correction device has stronger self-adaptive characteristic and better gamma correction effect on the display module with larger discreteness; and each current target binding point to be adjusted of the display module is respectively adjusted according to brightness information and color coordinate information, so that the calibration rework phenomenon caused by three-color distribution and white balance adjustment in the traditional adjusting method is avoided, the gamma curve of the display module is quickly and effectively corrected, and the technical problems of poor self-adaption and time consumption in the traditional gamma correction method are solved.
The gamma correction method of the display module according to the embodiment of the invention will be described in detail below.
It should be noted that, in the gamma correction method for a display module according to the embodiment of the present invention, the gamma curve is corrected by correcting the colors of a plurality of target binding points, wherein each target binding point corresponds to 3 registers, which are respectively R, G, B registers of each of the three primary colors. In the embodiment of the present invention, the color information includes luminance information and color coordinate information, and the color coordinate information includes color coordinate x and color coordinate y, that is, the color coordinate information is represented by CIE-xy chromaticity diagram shown in fig. 2. Referring to fig. 2, the CIE-xy chromaticity diagram shown in fig. 2 includes annular equal saturation lines within the visible RGBW interval and equal hue wavelength lines emitted from the W point (white point), wherein the color purity of each point on the outermost circle of the equal saturation lines is the highest, and the color light wavelength of each point is gradually decreased when the point rotates counterclockwise from the lower right around the equal saturation lines.
First, the basic flow of gamma correction is described as follows
The basic flow of gamma correction includes:
(1) for the target binding point to be adjusted currently by the display module, the processor calculates a target brightness range and a target color coordinate range of the target binding point according to the corrected target and a preset error, for example, the target brightness range is determined by an error of target brightness ± 5%, and the target color coordinate range is determined by an error of target color coordinate x ± 5% and an error of target color coordinate y ± 5%, respectively.
(2) And after setting an initial correction value in each register of the target binding point, driving the display module to light by adopting the initial correction value.
(3) And acquiring initial brightness information and initial color coordinate information of the target binding point in the image displayed by the display module by using a color analyzer.
(4) The processor determines whether the initial luminance information is outside a target luminance range, wherein,
in case that the initial luminance information does not exceed the target luminance range, the next step (5) is directly performed.
And conversely, under the condition that the initial brightness information exceeds the target brightness range, the correction value of the RGB register is synchronously adjusted for the target binding point. And then, jumping to the previous step (3) to acquire the color information of the target binding point after the call-back, and continuing to perform gamma correction, namely, adjusting the color coordinate information through the next step (5), wherein the adjustment of the color coordinate information through the step (5) is based on more accurate initial color coordinate information because the color information of the target binding point after the call-back is acquired again.
Specifically, when the initial luminance information exceeds the target luminance range, the respective registers of RGB three colors of the target binding are respectively adjusted by the same step value for register correction values, so that the target binding luminance information is adjusted to the target luminance range as much as possible without changing the color coordinate information.
For example, if the initial luminance information is larger than the maximum value of the target luminance range, the respective register correction values of the RGB three colors are reduced by the same step value at the same time; and if the initial brightness information is smaller than the minimum value of the target brightness range, increasing the correction value of each register of the RGB three colors by the same stepping value.
(5) And the processor judges whether the initial color coordinate information exceeds the target color coordinate range, wherein under the condition that the initial color coordinate information does not exceed the target color coordinate range, the current color information adjustment of the target binding point is finished, and then the color information adjustment of the next target binding point is carried out, wherein the adjustment comprises the next adjustment process of the same target binding point and the adjustment processes of different target binding points.
On the contrary, under the condition that the initial color coordinate information exceeds the target color coordinate range, the color coordinate information of the target binding point is adjusted.
Specifically, in the case where the initial color coordinate x exceeds the range of the target color coordinate x in the range of the target color coordinate, the correction value of the R register is adjusted; and adjusting the correction value of the B register under the condition that the initial color coordinate y exceeds the target color coordinate y range in the target color coordinate range.
For example, for color coordinate x, the R register correction value is decreased if the initial color coordinate x is greater than the maximum value of the target color coordinate x range, and the R register correction value is increased if the initial color coordinate x is less than the minimum value of the target color coordinate x range; for the color coordinate y, if the initial color coordinate y is larger than the maximum value of the range of the target color coordinate y, the correction value of the register B is increased; and if the initial color coordinate y is smaller than the minimum value of the range of the target color coordinate y, reducing the correction value of the B register.
In the embodiment of the invention, the color coordinate information is not adjusted through the G register value, and because the contribution of the G component to the brightness is large, the adjustment reworking phenomenon caused by the adjustment of the G component is avoided by respectively adjusting the brightness information and the color coordinate information, and the purpose of shortening the adjustment time is achieved.
(II) the brightness information callback and the color coordinate information callback both involve the adjustment of the register correction value, and the following detailed description is made on the adjustment process of the register correction value
It should be noted that, in the conventional gamma correction method, which is a search algorithm, in the adjustment process implemented by performing gamma correction, the gamma correction cannot be implemented due to the unimodal condition, or dead cycle occurs in the adjustment under the condition of high variation rate, or the adjustment cannot be converged in the gamma curve with relatively large discreteness, and therefore, the adjustment effect is not ideal. Based on this, the inventor finds out through a large amount of experiments and practices that: although the rate of change of the luminance information and the color coordinate information with the register value is relatively complex in the entire adjustment range of the register value, in the local range, the luminance information and the register value, or the color coordinate information and the register value are approximately in a linear relationship, and then the register correction value is adjusted according to the rate of change in the embodiment of the invention.
FIG. 3 is a flow chart of a register leveling adjustment method. Referring to fig. 3, the process of adjusting the register leveling value includes:
step S301, obtaining the change rate RL of the color information of the display module along with the register value at the initial color information1。
Step S302, obtaining the adjustment value DL of the initial color information which is returned to the target range1。
Step S303, according to the change rate RL1And the adjustment value DL1And determining a stepping value to adjust the correction value of the register through the stepping value, wherein the color information comprises brightness information or color coordinate information, the initial color information correspondingly comprises initial brightness information or initial color coordinate information, and the target range comprises a target brightness range or a target color coordinate range.
It should be noted that, in the brightness information callback process, the change rate in step S301 is the change rate of the target binding brightness information at the initial brightness information, that is, the brightness change rate; in the process of recalling the color coordinate information, the change rate in step S102 is the change rate of the target binding point color coordinate information at the initial color coordinate information, that is, the color coordinate change rate.
It should be understood that the relationship between the change of the luminance information or the color coordinate information with the register value is described by a curve, and the slopes of different points of the curve are different, that is, the change rate of the luminance information with the change of the register value is different at different luminance values, and the change rate of the color coordinate information with the change of the register value is also different at different color coordinate values, so that the change rate of the color information at the initial color information position is adopted in step S303, which is beneficial to improving the adjustment accuracy of the register value, and reducing the number of invalid adjustment steps, so that the color information of the target binding point can be adjusted to the target range after a small number of steps.
In an alternative embodiment, step S303, determining a step value according to the change rate and the adjustment value includes:
determining a step length threshold StepMax according to the change amplitude of the color information of the display module along with the change rate of the register value; then, the adjustment value DL is judged1And rate of change RL1Whether the ratio of (1) is greater than the step threshold value StepMax; under the condition that the ratio is not larger than the step length threshold StepMax, the correction value of the register is adjusted back to the target range in one step, and the step value of the step is the adjustment value DL1And rate of change RL1The ratio of (A) to (B); and (2) under the condition that the ratio is greater than the step size threshold StepMax, adjusting the register correction value in multiple steps until the initial color information is recalled to the target range, specifically, obtaining the current change rate of the color information of the display module at the current color information along with the register value before adjusting the register correction value in each step, then determining the current stepping reference value of the current step adjustment register correction value according to the current change rate and the change rate of the previous preset step, if the stepping reference value is not greater than the step size threshold StepMax, determining the current stepping value of the current step as the stepping reference value, otherwise, determining the current stepping value of the current step as the step size threshold.
It should be noted that the change range of the target binding point color information along with the change rate of the register value is usually determined by the characteristics of the display modules, so that the change rates of the binding point color information of some display modules along with the register value are relatively stable, that is, the change range of the change rates is relatively small, and at this time, the step length threshold value StepMax can be set to be relatively large; otherwise, the step size threshold StepMax can be set smaller. And the variation range of the color coordinate information along with the register value variation rate is larger than the brightness information, therefore, the step size threshold value when the color coordinate information is adjusted back is set to be smaller than the step size threshold value when the brightness information is adjusted back, for example, the step size threshold value when the color coordinate information is adjusted back is set to be one half of the step size threshold value of the adjustment back brightness information.
Further, step S301, obtaining a change rate RL of the color information of the display module along with the register value at the initial color information1Specifically, the initial correction value of the register corresponding to the initial color information is adjusted by using the step size threshold value StepMax as the step value, and the adjusted initial correction value of the register is adjustedWriting the initial correction value into a corresponding register, acquiring the color information of the adjusted target binding point by a color analyzer, and changing the color information of the adjusted target binding point by a variable quantity delta L1The ratio to the step size threshold StepMax is determined as the rate of change RL1。
Determining a current stepping reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step, wherein the step reference value is determined according to the current change rate when the register value is adjusted in the first step; when adjusting the register value in the second step, determining a stepping reference value according to the current conversion rate and the previous conversion rate; in the third and subsequent steps of adjusting the register value, the step reference value is determined at the current conversion rate and the rates of change of the previous two steps.
The determining the current step reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step may include: determining the current change rate and the weight of the change rate of each preset step according to the change amplitude of the color information of the display module along with the change rate of the register value; based on the weight, calculating a weighted sum of the current rate of change and the rate of change of the previous preset step; and determining a stepping reference value by weighting and combining the current color information of the target binding point.
For example, if the target binding color information is recalled to be within the target range in two steps:
in the first step of adjustment: determining the rate of change RL1Then, a first target difference value (difference value of initial color information and target color) DL is set1And rate of change RL1Is determined as a step reference value Q1And the step value Q is judged1If the value is larger than StepMax, the Step value Step of the first Step is1＝StepMax；
In the second step of adjustment: determining the rate of change RL2Then step the reference value Q2Is determined as Q2＝DL2/(k1*RL1+k2*RL2) Wherein DL is2Is a second target difference value (the difference value between the target binding point color information of the display module obtained after the first step of adjustment and the target color), k1Is RL1Weight of (1), k2Is RL2Weight of (1), k1And k2The value range is between 0 and 1.0, and is judged to be Q2If not greater than StepMax, let the Step value Step of the second Step2＝Q2。
For another example, if the target binding point color information is recalled to be within the target range through three steps, then:
in the second step of adjustment, Q is obtained by judgment2And if the voltage is larger than StepMax, continuing to perform the third step of adjustment.
In the third adjustment step, the rate of change RL is likewise determined3Then step the reference value Q3Is determined as Q3＝DL3/(k1*RL1+k2*RL2+k3*RL3) Wherein DL is3Is the third target difference (the difference between the target binding point color information of the display module and the target color obtained after the second step of adjustment), k3Is RL3Weight of (1), k3Is also in the range of 0 to 1.0, and Q is obtained by judgment3Not greater than StepMax, let the Step value Step of the third Step3＝Q3。
For the case that the number of steps taken to call back the target binding point color information to the target range is greater than three steps, referring to fig. 4, the step value of each step after the third step is to calculate the current weighted sum according to the current change rate, the change rate of the previous step and the change rates of the previous two steps, then the step reference value of the current step is obtained by dividing the difference value between the current color information of the target binding point and the target color information by the current weighted sum, and then the step reference value of the current step can determine the current step value, which is certainly constrained by the step threshold value and is not described in detail.
Therefore, when the adjustment step number is larger than three steps, the three steps are sequentially taken as a module to perform step number sliding to realize the next adjustment. According to the gamma correction method of the display module, due to the fact that the self information of the display module is adopted to carry out sliding iteration for multiple times, the self-adaptive capacity is strong, the display module with large discreteness is well represented, the brightness and color coordinate deviations are small and are within the set range, the gamma correction method has the advantages of being short in adjustment time and fast in speed, and the production line speed of the display module is remarkably improved.
Fig. 5 is a block diagram illustrating a gamma correction device of a display module according to a second embodiment of the present invention, and referring to fig. 5, the gamma correction device of the display module includes: the system comprises a driving module 100, an acquisition module 200, an adjustment module 300 and a writing module 400, wherein, for each current target binding point of the display module to be adjusted,
the driving module 100 is used for driving the display module to light up by adopting the initial correction value of the RGB register;
the acquisition module 200 is used for acquiring initial brightness information and initial color coordinate information from the display module through the color analyzer;
the adjusting module 300 is configured to synchronously adjust the correction values of the RGB registers according to the initial luminance information, and respectively adjust the correction values of the RB registers according to the initial color coordinate information;
a write-in module 400, configured to write the adjusted leveling value in the RGB register;
the adjustment times of the correction values of the registers and the step values of each adjustment are determined by the change rate of the color information of the display module along with the register values, and the color information comprises brightness information or color coordinate information.
In the gamma correction device for a display module according to the embodiment of the present invention, after the acquisition module 200 acquires the initial brightness information and the initial color coordinate information from the display module, the adjustment module 300 synchronously adjusts the correction values of the RGB registers according to the initial brightness information, and respectively adjusts the correction values of the RB registers according to the initial color coordinate information, and the adjustment times of the correction values of the registers and the step value of each adjustment are determined by the change rate of the color information of the display module with the register values, since the correction values of the registers are adjusted based on the information of the display module itself, the gamma correction device has strong adaptive characteristics, and adjusts the brightness information and the color coordinate information of each current target binding point to be adjusted of the display module, thereby avoiding the calibration rework phenomenon caused by the adjustment of the three color components and the white balance in the conventional adjustment method, and realizing the rapid and effective correction of the gamma curve of the display module, the technical problems of poor self-adaption and time consumption of the traditional gamma correction method are solved.
In an alternative embodiment, the adjustment module 300 is configured to:
judging whether the initial brightness information exceeds the target brightness range;
under the condition that the initial brightness information exceeds the target brightness range, the correction value of the RGB register is synchronously adjusted;
and under the condition that the initial brightness information does not exceed the target brightness range, judging whether the initial color coordinate information exceeds the target color coordinate range, and under the condition that the initial color coordinate information exceeds the target color coordinate range, respectively adjusting the correction value of the RB register.
In an alternative embodiment, the adjustment module 300 is configured to:
when the initial brightness information is larger than the maximum value of the target brightness range, reducing the correction value of the RGB register by the same step length;
and when the initial brightness information is smaller than the minimum value of the target brightness range, increasing the rectification value of the RGB register by the same step length.
In an alternative embodiment, the initial color coordinate information includes an initial color coordinate x and an initial color coordinate y, and the target color coordinate range includes a target color coordinate x range and a target color coordinate y range;
the adjustment module 300 is configured to: the correction value of the R register is adjusted in the case where the initial color coordinate x exceeds the range of the target color coordinate x, and the correction value of the B register is adjusted in the case where the initial color coordinate y exceeds the range of the target color coordinate y.
In an alternative embodiment, the adjustment module 300 is configured to:
acquiring the change rate of the color information of the display module along with the register value at the initial color information;
acquiring an adjusting value of the initial color information which is recalled to a target range;
determining a step value according to the change rate and the adjustment value to adjust the correction value of the register by the step value,
the initial color information includes initial brightness information or initial color coordinate information, and the target range includes a target brightness range or a target color coordinate range.
In an alternative embodiment, the adjustment module 300 is configured to:
determining a step length threshold according to the change amplitude of the color information of the display module along with the change rate of the register value;
judging whether the ratio of the adjusting value to the change rate is larger than a step length threshold value or not;
and under the condition that the ratio is not larger than the step length threshold value, the correction value of the register is adjusted back to be within the target range by one step, and the step value of the step is the ratio.
In an alternative embodiment, the adjustment module 300 is further configured to:
in the case that the ratio is greater than the step size threshold, the register correction value is adjusted in multiple steps until the initial color information is recalled to the target range, wherein,
before the register correction value is adjusted at each step, the current change rate of the color information of the display module along with the register value at the current color information is obtained;
determining a current stepping reference value of the correction value of the current step adjustment register according to the current change rate and the change rate of the previous preset step;
and under the condition that the stepping reference value is not larger than the step size threshold value, determining the current stepping value of the current step as the stepping reference value, otherwise, determining the current stepping value as the step size threshold value.
In an alternative embodiment, the adjustment module 300 is configured to:
when the register value is adjusted in the first step, determining a stepping reference value according to the current change rate;
when adjusting the register value in the second step, determining a stepping reference value according to the current conversion rate and the previous conversion rate;
in the third and subsequent steps of adjusting the register value, the step reference value is determined at the current conversion rate and the rates of change of the previous two steps.
In an alternative embodiment, the adjustment module 300 is configured to:
determining the current change rate and the weight of the change rate of each preset step according to the change amplitude of the color information of the display module along with the change rate of the register value;
based on the weight, calculating a weighted sum of the current rate of change and the rate of change of the previous preset step;
and determining a stepping reference value by weighting and combining the current color information of the target binding point.
It should be noted that, in the gamma correction device for a display module according to the second embodiment of the present invention, the gamma correction method for a display module according to the first embodiment of the present invention is performed, and in view of the detailed description of the gamma correction method for a display module according to the first embodiment, the operation process of the gamma correction device for a display module according to the second embodiment of the present invention is not repeated.
It should be understood that the executable instructions implementing the specified logic functions may be recombined to generate new modules, and thus the gamma correction apparatus of the display module is not limited to being divided by the module division method.
The flowcharts and block diagrams in the figures and block diagrams illustrate the possible architectures, functions, and operations of the systems, methods, and apparatuses according to the embodiments of the present invention, and may represent a module, a program segment, or merely a code segment, which is an executable instruction for implementing a specified logical function. The blocks of the drawings, and the order of the blocks, are intended to better illustrate the processes and steps of the embodiments and should not be taken as limiting the invention itself.
The various modules or units of the system may be implemented in hardware, firmware or software. The software includes, for example, a code program formed using various programming languages such as JAVA, C/C + +/C #, SQL, and the like. Although the steps and sequence of steps of the embodiments of the present invention are presented in method and method diagrams, the executable instructions of the steps implementing the specified logical functions may be re-combined to create new steps. The sequence of the steps should not be limited to the sequence of the steps in the method and the method illustrations, and can be modified at any time according to the functional requirements. Such as performing some of the steps in parallel or in reverse order.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The utility model provides a gamma correction method of display module assembly which characterized in that, to every present target tie point of treating the adjustment of display module assembly, carries out the following adjustment process:
driving the display module to light by adopting the initial correction value of the RGB register;
acquiring initial brightness information and initial color coordinate information from the display module by using a color analyzer;
synchronously adjusting the correction value of an RGB register according to the initial brightness information, and respectively adjusting the correction value of an RB register according to the initial color coordinate information;
writing the adjusted correction value into an RGB register;
the adjustment times of the correction values of the registers and the step value of each adjustment are determined by the change rate of the color information of the display module along with the register values, and the color information comprises brightness information or color coordinate information;
the adjustment process of the register correction value comprises the following steps: acquiring the change rate of the color information of the display module along with the register value at the initial color information; obtaining an adjustment value of the initial color information which is adjusted back to a target range; determining a step length threshold according to the change amplitude of the color information of the display module along with the change rate of the register value; judging whether the ratio of the adjusting value to the change rate is larger than the step length threshold value or not; and under the condition that the ratio is not larger than the step length threshold value, adjusting the correction value of the register back to the target range by one step, wherein the step value of the step is the ratio of the adjustment value to the change rate, the initial color information comprises the initial brightness information or the initial color coordinate information, and the target range comprises a target brightness range or a target color coordinate range.
2. The method of claim 1, wherein synchronously adjusting the deskew values for RGB registers based on the initial luminance information and separately adjusting the deskew values for RB registers based on the initial color coordinate information comprises:
judging whether the initial brightness information exceeds a target brightness range;
under the condition that the initial brightness information exceeds the target brightness range, synchronously adjusting the correction value of the RGB register;
and under the condition that the initial brightness information does not exceed the target brightness range, judging whether the initial color coordinate information exceeds the target color coordinate range, and under the condition that the initial color coordinate information exceeds the target color coordinate range, respectively adjusting the correction value of an RB register.
3. The method of claim 2, wherein adjusting the remediated values of RGB registers synchronously in the event that the initial luminance information exceeds the target luminance range comprises:
when the initial brightness information is larger than the maximum value of the target brightness range, reducing the correction value of the RGB register by the same step length;
and when the initial brightness information is smaller than the minimum value of the target brightness range, increasing the rectification value of the RGB register by the same step length.
4. The method of claim 2,
the initial color coordinate information comprises an initial color coordinate x and an initial color coordinate y, and the target color coordinate range comprises a target color coordinate x range and a target color coordinate y range;
respectively adjusting the correction values of the RB registers under the condition that the initial color coordinate information exceeds the target color coordinate range, wherein the method comprises the following steps: adjusting a rectification value of an R register if the initial color coordinate x exceeds the target color coordinate x range, and adjusting a rectification value of a B register if the initial color coordinate y exceeds the target color coordinate y range.
5. The method of claim 1, further comprising: in the event that the ratio is greater than the stride length threshold, adjusting a register fix value in multiple steps until the initial color information is recalled to the target range, wherein,
before the register correction value is adjusted in each step, the current change rate of the color information of the display module along with the register value at the current color information is obtained;
determining the current change rate and the weight of the change rate of each preset step according to the change amplitude of the color information of the display module along with the change rate of the register value;
calculating a weighted sum of the current rate of change and a rate of change of a previous preset step based on the weight;
the current color information of the target binding point is adjusted back to the ratio of the adjustment value of the target range to the weighted sum, and the ratio is determined as a stepping reference value;
and determining the current step value of the current step as the step reference value under the condition that the step reference value is not larger than the step threshold value, otherwise, determining the current step value as the step threshold value.
6. The method of claim 5, wherein calculating a weighted sum of a current rate of change and a previous preset step rate of change based on the weights comprises:
when the register value is adjusted in the first step, determining the current change rate as the weighted sum, and determining the ratio of the adjustment value for returning the current color information of the target binding point to the target range and the weighted sum as the stepping reference value;
when the register value is adjusted in the second step, calculating the weighted sum of the current conversion rate and the previous change rate so as to adjust the current color information of the target binding point back to the ratio of the adjustment value of the target range to the weighted sum to determine the step reference value;
and when the register value is adjusted in the third step and later, calculating the weighted sum of the current conversion rate and the change rates of the previous two steps so as to determine the ratio of the adjustment value of the target binding point current color information which is adjusted back to the target range to the weighted sum as the stepping reference value.
7. The utility model provides a gamma orthotic devices of display module assembly which characterized in that includes: the device comprises a driving module, an acquisition module, an adjustment module and a writing module, wherein for each current target binding point to be adjusted of the display module,
the driving module is used for driving the display module to be lightened by adopting the initial correction value of the RGB register;
the acquisition module is used for acquiring initial brightness information and initial color coordinate information from the display module through a color analyzer;
the adjusting module is used for synchronously adjusting the correction value of the RGB register according to the initial brightness information and respectively adjusting the correction value of the RB register according to the initial color coordinate information;
the writing module is used for writing the adjusted correction value into the RGB register;
the adjustment times of the correction values of the registers and the step value of each adjustment are determined by the change rate of the color information of the display module along with the register values, and the color information comprises brightness information or color coordinate information;
the process of register leveling being adjusted by the adjustment module includes: acquiring the change rate of the color information of the display module along with the register value at the initial color information; obtaining an adjustment value of the initial color information which is adjusted back to a target range; determining a step length threshold according to the change amplitude of the color information of the display module along with the change rate of the register value; judging whether the ratio of the adjusting value to the change rate is larger than the step length threshold value or not; and under the condition that the ratio is not larger than the step length threshold value, adjusting the correction value of the register back to the target range by one step, wherein the step value of the step is the ratio of the adjustment value to the change rate, the initial color information comprises the initial brightness information or the initial color coordinate information, and the target range comprises a target brightness range or a target color coordinate range.
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| CN113035152B (en) * | 2021-03-16 | 2022-06-03 | 武汉天马微电子有限公司 | Gray scale brightness adjusting method and device of display panel |
| CN113129813B (en) * | 2021-04-23 | 2022-04-22 | 利亚德光电股份有限公司 | White balance adjusting method and device and computer equipment |
| CN113327552B (en) * | 2021-06-21 | 2022-05-17 | 合肥维信诺科技有限公司 | Gamma debugging method and device, electronic equipment and storage medium |
| CN114360426B (en) * | 2022-01-05 | 2023-08-01 | 苏州华兴源创科技股份有限公司 | Gamma adjusting method, gamma adjusting device, computer equipment and storage medium |
| CN115035851B (en) * | 2022-08-10 | 2022-10-28 | 深圳精智达技术股份有限公司 | Gamma white balance rapid adjustment method and related device |
| CN115170681B (en) * | 2022-09-06 | 2023-01-03 | 宏晶微电子科技股份有限公司 | Gamma lookup table generation method and device, electronic equipment and storage medium |
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