CN113724644B - Method for compensating brightness and chroma of display device and related equipment - Google Patents
Method for compensating brightness and chroma of display device and related equipment Download PDFInfo
- Publication number
- CN113724644B CN113724644B CN202110995715.5A CN202110995715A CN113724644B CN 113724644 B CN113724644 B CN 113724644B CN 202110995715 A CN202110995715 A CN 202110995715A CN 113724644 B CN113724644 B CN 113724644B
- Authority
- CN
- China
- Prior art keywords
- value
- target pixel
- pixel point
- target
- compensation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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]
-
- 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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- 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
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
Abstract
The present disclosure provides a method for compensating luminance and chrominance of a display device and a related apparatus. The display device comprises a plurality of pixel points. The method comprises the following steps: determining a target pixel point in the plurality of pixel points; receiving preset optical parameters of the target pixel points under at least two current values; calculating compensation coefficients of brightness values and chromatic values of the target pixel points under the at least two current values according to a preset relation curve of optical parameters and current values and by combining preset optical parameters of the target pixel points under the at least two current values and target optical parameters of the display device; and determining a segmented compensation curve of the brightness value and the chromatic value of the target pixel point based on the compensation coefficients of the brightness value and the chromatic value of the target pixel point under the at least two current values, and compensating the brightness value and the chromatic value of the target pixel point.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a method and related device for compensating luminance and chrominance of a display device.
Background
With the continuous development of modern technologies, people have higher and higher requirements on the display quality, the display function, the power consumption and the like of display equipment. The active array mini light emitting diode (AM miniLED) display screen has the characteristics of high refresh rate, low flash, healthy eye protection, low power consumption and the like, and is a trend of future development of small-distance Light Emitting Diode (LED) display screens.
However, since the LED light emission characteristic is non-linear in an Active Matrix (AM) driving mode, the conventional correction method usually adopts a linear method to compensate, and cannot correct the AM display screen to a high level.
Disclosure of Invention
The present disclosure provides a method for compensating luminance and chrominance of a display device and a related apparatus.
In a first aspect of the present disclosure, a method for compensating luminance and chrominance of a display device is provided, where the display device includes a plurality of pixel points, and the method includes:
determining a target pixel point in the plurality of pixel points;
receiving preset optical parameters of the target pixel point under at least two current values;
calculating compensation coefficients of brightness values and chromatic values of the target pixel points under the at least two current values according to a preset relation curve of optical parameters and current values and by combining preset optical parameters of the target pixel points under the at least two current values and target optical parameters of the display device; wherein the predetermined optical parameter and the target optical parameter are the same optical parameter and are both related to luminance values and chrominance values;
and determining a segmented compensation curve of the brightness value and the chromatic value of the target pixel point based on the compensation coefficients of the brightness value and the chromatic value of the target pixel point under the at least two current values, and compensating the brightness value and the chromatic value of the target pixel point.
In a second aspect of the present disclosure, there is provided a display device including:
a display module configured to: displaying according to the display data; and
a control unit electrically coupled with the display module and configured to: receiving a segmented compensation curve calculated by the method of the first aspect, and compensating the display data based on the segmented compensation curve.
In a third aspect of the disclosure, a computer device is provided, comprising one or more processors, a memory; and one or more programs, wherein the one or more programs are stored in the memory and executed by the one or more processors, the programs comprising instructions for performing the method according to the first aspect.
In a fourth aspect of the disclosure, there is provided a non-transitory computer-readable storage medium containing a computer program which, when executed by one or more processors, causes the processors to perform the method of the first aspect.
In a fifth aspect of the present disclosure, there is provided a computer program product comprising computer program instructions which, when run on a computer, cause the computer to perform the method of the first aspect.
According to the method and the related equipment for compensating the brightness and the chromaticity of the display device, the display device is compensated through the segmented compensation curve obtained through calculation, and a good compensation effect can be obtained.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1A illustrates a flow diagram of an exemplary method provided by an embodiment of the present disclosure.
Fig. 1B shows a detailed flowchart of the step of calculating the optical parameter versus current value according to an embodiment of the disclosure.
Fig. 1C shows a detailed flowchart of the step of calculating the compensation coefficient according to the embodiment of the present disclosure.
FIG. 1D shows a detailed flowchart of the step of calculating a piecewise compensation curve according to an embodiment of the present disclosure.
FIG. 1E shows a detailed flowchart diagram of the step of determining a piecewise compensation curve in accordance with an embodiment of the present disclosure.
Fig. 2A shows a schematic diagram of component-based compensation.
Fig. 2B shows a comparison of input current versus stimulus value X for a PM (passive matrix) miniLED display screen and an AM miniLED display screen.
Fig. 3 shows a schematic diagram of an exemplary display device according to an embodiment of the present disclosure.
Fig. 4A shows a schematic diagram of a display effect of a display device before compensation according to an embodiment of the disclosure.
Fig. 4B is a schematic diagram illustrating a display effect of the display device after compensation according to the embodiment of the disclosure.
Fig. 5 shows a hardware structure diagram of an exemplary computer device provided by the embodiment of the present disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by one having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In order to improve uniformity of luminance and chromaticity of a display device, embodiments of the present disclosure provide a method of compensating luminance and chromaticity of a display device.
Fig. 1A illustrates a flow diagram of an exemplary method 100 provided by an embodiment of the present disclosure. The method 100 may be used to compensate for the luminance and chrominance of a display device. In some embodiments, the display device may be an AM miniLED display, and the display device may include a plurality of pixels, which may be minileds. As shown in fig. 1A, the method 100 may include the following steps.
In step 102, a predetermined relationship curve between the optical parameter and the current value may be determined for subsequent calculation of a compensation coefficient (or called a correction coefficient).
For the sake of computational convenience, discrete relation data of the optical parameters to the current values are not stored in the computer device. Therefore, in the present embodiment, the relationship between the optical parameter and the current value is processed into a relationship curve.
In this embodiment, the CIE1931 standard chromaticity observer spectrum tristimulus values are selected as the optical parameters for convenience of calculation. For example, a spectral stimulus value X is selected.
In step 102, the relationship curve between the optical parameter and the current value can be calculated for the three primary colors (i.e. RGB) of the display field.
FIG. 1B shows a detailed flowchart of the step 102 of calculating the optical parameter versus current value according to the embodiment of the disclosure. As shown in fig. 1B, in some embodiments, step 102 may further include the following steps.
At step 1022, a plurality of current values may be determined. In some embodiments, the current values may be obtained by dividing the current corresponding to the maximum gray scale into a plurality of steps. For example, the current may be divided into 2 according to a preset gray level b b One gear (i.e. 2) b Current values).
At step 1024, a target color of the three primary colors, e.g., red, may be determined.
At step 1026, the optical parameter corresponding to the target color (e.g., red) of the display device at the plurality of current values may be received.
In this step, after the target color of the three primary colors is determined, the current steps may be performed one by one (for example, 2) b Each gear), all red pixel points of the display device are lightened, and then an optical test instrument is utilized to measure optical parameters corresponding to the red pixel points under each current gear. For example, the optical parameter measured by the optical test instrument may be a brightness value, which we can then convert to the optical parameter we need, e.g., stimulus value X R . The conversion formula from luminance values to stimulus values is known and will not be described in detail here.
In this step, the optical parameter measured by the optical testing apparatus may be measured in the central region of the display device.
Generally, after each batch of LEDs is produced by an LED manufacturer, the LEDs are binned according to the optical parameters of each LED. Specifically, the LEDs may be classified according to their optical parameters, and LEDs having optical parameters within the same set range are packed into one bin. The optical parameters used in bin division may include chromaticity, luminance, voltage, and the like. Since the optical parameters of the LEDs with the same bin are within the same setting range, and the optical parameters of the LEDs with different bins are different, in order to ensure the compensation accuracy of the display device, when the display device is a miniLED display and different display devices belong to different bins, the different display devices need to respectively measure the optical parameters corresponding to the target color pixel point under each current level by using the above steps and respectively calculate the compensation coefficients.
The optical parameter (e.g., stimulus value X) corresponding to the target color (e.g., red) at a plurality of measured current values R ) Then, in step 1028, a relationship curve between the optical parameter and the current value corresponding to the target color may be obtained by fitting based on the plurality of current values and the corresponding optical parameter, and the relationship curve is used as the relationship curve between the preset optical parameter and the current value corresponding to the target color (e.g., red).
In some embodiments, a fitting formula X = a × I is employed γ Completing the fitting of the relation curve, wherein when the target color is red, X is the measured X R I is the corresponding current value when X is measured, the values of a and gamma can be obtained by fitting, and thenThe fitting formula is then stored for subsequent calculations.
After determining the relationship curve between the preset optical parameter and the current value corresponding to the target color (e.g., red), re-determining the target color (e.g., green or blue) of the three primary colors according to the method and then determining the relationship curve between the corresponding optical parameter and the current value until each color of the three primary colors of RGB is calculated to obtain the corresponding relationship curve, and then storing the fitting formula corresponding to the relationship curve for subsequent calculation.
After the relationship curve between the preset optical parameters of RGB and the current value is obtained through calculation, in step 104, a target pixel point i in a plurality of pixel points of the display device may be determined. The target pixel point i can be any one of a plurality of pixel points of the display device, and each pixel point of the display device or a selected area of the display device can be processed by adopting a processing mode of the target pixel point i, so that a compensation coefficient corresponding to each pixel point of the display device is obtained. The following description will take the target pixel point i as an example.
At step 106, a predetermined optical parameter (e.g., spectral tristimulus values XYZ) of the target pixel point i at least two current values may be received.
In some embodiments, three current values may be selected to respectively illuminate the display device and measure the corresponding optical parameter. The three current values may be selected, for example, corresponding to gray levels of 90, 160, and 224.
In step 108, according to the preset relationship curve between the optical parameter and the current value calculated in step 102, the predetermined optical parameters of the target pixel at the at least two current values (for example, three current values) and the target optical parameters of the display device are combined to calculate the compensation coefficients of the luminance values and the chrominance values of the target pixel at the at least two current values. Wherein the predetermined optical parameter and the target optical parameter are the same optical parameter and are both associated with luminance values and chrominance values.
Fig. 1C shows a detailed flowchart of the step 108 of calculating the compensation coefficient according to the embodiment of the disclosure. As shown in fig. 1C, in some embodiments, step 108 may further include the following steps.
At step 1082, a first current value I (e.g., a current value corresponding to a gray scale 90) of the three current values is determined. The first current value I may be any one of three current values, and for each of the three current values, the first current value I is selected for processing. The first current value I will be described below as an example.
In step 1084, the spectrum tristimulus value X of the target pixel point I under the first current value I is obtained i 、Y i 、Z i Combining target spectral tristimulus values of a display device
A target spectral stimulus value for the target pixel point i at the first current value is calculated (e.g.,
)。
in some embodiments, in step 1084, the second spectral stimulus value Y of the target pixel i under the three primary colors may be calculated first i And a first spectral stimulus value X i Ratio of (a) i R 、α i G 、α i B And a third spectral stimulus value Z of the target pixel point i under three primary colors i And the first spectral stimulus value X i Ratio of (beta) i R 、β i G 、
Then, calculating a target spectral stimulus value of the target pixel point I under the three primary colors under the first current value I according to the following formula
Therein, the eyesStandard spectrum tristimulus value
May be a set value. In some embodiments, the target spectral tristimulus value
The average value of XYZ of all the pixel points in the display device actually measured at the first current value I (the average values of XYZ are calculated separately, that is,
is the average value of X and is,
is the average value of the Y values,
as the average value of Z). This prevents color shift and reduces luminance loss.
For each pixel point of the display device, the stimulus value X of RGB can be obtained by adopting the method R 、X G 、X B Including primary component stimulus values that have a primary effect on luminance correction and secondary component stimulus values that have a primary effect on chrominance correction. For example, when a correction is made for red,
namely the main component stimulation value is obtained,
the sub-component stimulation values.
In step 1086, the target spectral stimulus value can be determined according to the relationship curve between the preset optical parameter and the current value calculated in step 102
Corresponding second current value I'.
In some embodiments, in step 1086, the target spectral stimulus value of the target pixel point I under three primary colors at the first current value I may be determined
Determining a target spectrum stimulus value by combining a preset relation curve of optical parameters and current values of a target pixel point i under three primary colors
A corresponding second current value.
Wherein the target spectral stimulus value
The second current value corresponding to the relation curve of the preset optical parameters and the current values of the target pixel point I under the three primary colors is I' RR 、I′ RG 、I′ RB Target spectral stimulus value
The second current value corresponding to the relation curve of the preset optical parameters and the current values of the target pixel point I under the three primary colors is I' GR 、I′ GG 、I′ GB Target spectral stimulus value
The second current value corresponding to the relation curve of the preset optical parameters and the current values of the target pixel point I under the three primary colors is I' BR 、I′ BG 、I′ BB 。
Wherein, I' RR Can be based on the target spectral stimulus value
Calculated in conjunction with the red corresponding relationship curve (fitted curve), similarly, l' RG Can be based on the target spectral stimulus value
Combined with green pairCalculating a corresponding relation curve (fitting curve) to obtain I' RB Can be based on the target spectral stimulus value
And calculating by combining a relation curve (fitting curve) corresponding to blue. Can obtain I 'in the same way' GR 、I′ GG 、I′ GB 、I′ BR 、I′ BG 、I′ BB 。
At step 1088, the first and second current values I 'may be varied according to' RR 、I′ RG 、I′ RB 、I′ GR 、I′ GG 、I′ GB 、I′ BR 、I′ BG 、I′ BB And calculating the compensation coefficients of the brightness value and the chromatic value of the target pixel point i.
In some embodiments, in step 1088, a target spectral stimulus value may be calculated
Corresponding second current value I' RR 、I′ RG 、I′ RB 、I′ GR 、I′ GG 、I′ GB 、I′ BR 、I′ BG 、I′ BB The ratio C = I'/I of the first current value I is obtained to obtain a compensation coefficient
Wherein the compensation coefficient
Compensation coefficients for principal components
To compensate for red colorTime-of-flight sub-component compensation coefficient, compensation coefficient
For compensating the sub-component in the case of green, the compensation factor
The coefficient is compensated for the minor component when compensating for blue.
For example, when compensating for red pixels, the compensation coefficient is selected
Selecting compensation coefficients for the principal component compensation coefficients
The sub-component compensation coefficient. The same applies to the pixels of other colors. Fig. 2A shows a schematic diagram of component-based compensation.
By processing each pixel point of the display device by adopting the steps, the compensation coefficient of each pixel point in the display device under three current values can be calculated, each current value corresponds to one group of compensation coefficients, and three groups of compensation coefficients can be formed. The three groups of compensation coefficients are adopted for compensation, so that the full gray scale compensation of the display device can reach a higher level.
It is understood that the above embodiment uses three current values to measure data and calculate the compensation coefficient, but the selection of the number of current values may be changed according to the requirement, and is not limited specifically, but is only exemplary.
After the compensation coefficients are obtained through calculation, in step 110, a piecewise compensation curve of the luminance value and the chrominance value of the target pixel point i may be determined based on the compensation coefficients of the luminance value and the chrominance value of the target pixel point i under the at least two current values.
In some embodiments, when the number of current values in the at least two current values is n, the number of segments of the segmented compensation curve is n, and each segment of the segmented compensation curve corresponds to a set of compensation coefficients.
FIG. 1D shows a detailed flowchart of the step 110 of calculating the piecewise compensation curve according to an embodiment of the present disclosure. As shown in fig. 1D, in some embodiments, step 110 may further include the following steps.
In step 1102, at least two uniformity variation curves of the display device respectively measured based on the compensation coefficients of the luminance value and the chrominance value of each pixel point under the at least two current values are received.
In this step, the uniformity variation curve of the display device can be measured by using each set of compensation coefficients (corresponding to the current values) obtained by the above calculation, so that three uniformity variation curves can be measured accordingly. The uniformity variation curve may be a luminance or chrominance uniformity variation curve.
At step 1104, at least one segmentation point is determined according to the at least two uniformity curves.
For example, when there are three uniformity curves, the three uniformity curves can correspondingly determine two intersection points, which are segmentation points.
At step 1106, the piecewise compensation curve is determined in conjunction with the at least two uniformity variation curves and the at least one piecewise point.
For example, assuming that three sets of compensation coefficients C1, C2, C3 corresponding to the uniformity variation curves measured based on the corresponding current values when the gray levels are 90, 160, 224 are L1, L2, L3, and the intersection points of the curves L1, L2, L3 are d1, d2, the piecewise compensation curve takes d1, d2 as the piecewise points, and is divided into three segments if the corresponding current value I1 of d1 in the curves L1, L2, L3 is smaller than the corresponding current value I2 of d2 in the curves L1, L2, L3, wherein the first segment is (0, I1) and the segment curve is the portion of the curve L1 in (0, I1), the second segment is (I1, I2) and the segment curve is the portion of the curve L2 in (I1, I2), the third segment is (I2, imax) and the segment curve is the portion of the curve L3 in (I2, I2), wherein the first segment corresponds to the compensation coefficient is the compensation coefficient of the third set, C1, C3.
In some cases, there may be a point in the uniformity variation curve measured based on the compensation coefficients measured for the initially selected three current values and the resulting segmented compensation curve that does not satisfy the uniformity difference threshold (e.g., 97%), and the segmented compensation curve needs to be adjusted in order to ensure uniformity.
FIG. 1E shows a detailed flowchart of the step 1106 of determining the piecewise compensation curve according to an embodiment of the present disclosure. As shown in fig. 1E, in some embodiments, step 1106 may further include the following steps.
In step 11062, an initial piecewise compensation curve is determined according to the at least two uniformity variation curves and the at least one piecewise point.
In step 11064, it is determined whether there are points in the initial piecewise compensation curve that do not meet a uniformity difference threshold.
In step 11066, in response to determining that there is a point in the initial segment compensation curve that does not satisfy the uniformity difference threshold, determining the segment in the initial segment compensation curve where the point that does not satisfy the uniformity difference threshold is located. For example, the point is located in the segment (I1, I2).
In step 11068, two current values corresponding to the two segment points of the segment where the current value is located are determined, a smaller current value of the two current values is increased by a preset incremental value, and a larger current value is decreased by the preset incremental value, so that two changed current values are obtained. For example, if the preset increment value is the current difference Δ I corresponding to 5 gray levels, I1 is increased by Δ I to obtain I1', and I2 is decreased by Δ I to obtain I2'.
In step 11070, based on the two changed current values, the compensation coefficients of the luminance value and the chrominance value of the target pixel point are calculated again. For example, two of the three current values (for example, the corresponding current values when the gray scale is 90 and 160) used for testing the obtained compensation coefficients are replaced by I1 'and I2', and then the compensation coefficients of the luminance value and the chrominance value of the target pixel point are calculated again according to the method.
In step 11072, the piecewise compensation curve is determined based on the re-calculated compensation coefficients of the luminance value and the chrominance value of the target pixel point.
If the points which do not meet the threshold value of the uniformity difference value exist in the segmented compensation curve determined again, the segmented compensation curve can be divided again by adopting the method until all the points on the segmented compensation curve meet the requirement of the threshold value of the uniformity difference value.
After the piecewise compensation curve is obtained, the display device can be compensated by the piecewise compensation curve obtained by the method 100 according to the display device of the same specification (miniLED display, micro LED display, or display using LED (or miniLED, micro LED) as backlight and also ensuring that LED is in the same bin).
According to the foregoing, the segmented compensation curve is segmented based on the current value, different segments correspond to different compensation coefficients, and when the input current of the display device is in a certain segment, the compensation coefficient corresponding to the segment is selected for compensation.
Fig. 2B shows a comparison of input current versus stimulus value X for a PM (passive matrix) miniLED display screen and an AM miniLED display screen. As can be seen from fig. 2B, the relationship curve of the PM (passive matrix) miniLED display screen to the stimulus value X is linear, while the relationship curve of the AM miniLED display screen to the stimulus value X is stage-linear. Therefore, the AM miniLED display screen cannot be well compensated by adopting a linear compensation mode, and the segmented compensation curve can well realize the compensation of the AM miniLED display screen. It is understood that the stimulus value X (or stimulus values Y, Z) has a corresponding conversion relationship with luminance and chromaticity, and therefore, the characteristics of the relationship curve reflected on the stimulus value X are correspondingly applied to the relationship curve of luminance, chromaticity and current value. Therefore, the compensation coefficient is calculated by using the stimulus value as a medium in the disclosure, and then the luminance and the chrominance can be compensated based on the conversion relation between the stimulus value and the luminance and the chrominance.
According to the method for compensating the brightness and the chromaticity of the display device, the display device is compensated through the segmented compensation curve obtained through calculation, and a good compensation effect can be obtained. Further, when the display device is an AM miniLED display screen, according to the response characteristic of the miniLED in the AM driving mode, the method for compensating the brightness and the chromaticity of the display device provided by the embodiment of the disclosure can improve the uniformity of the full gray scale brightness and chromaticity of the AM miniLED display screen, and further improve the visual effect.
It can be understood that the method for compensating luminance and chromaticity of a display device provided by the embodiment of the disclosure may be used to compensate an active light emitting display device (e.g., an OLED display, a miniLED/micro led display, etc.), and may also compensate a backlight source of a passive light emitting display device (e.g., a liquid crystal display), and various display devices may selectively adopt the method provided by the embodiment of the disclosure to compensate luminance and chromaticity according to actual needs.
In the embodiment of the present disclosure, three primary colors of RGB are taken as an example for explanation, and it is understood that other colors may be selected for parameter calculation, for example, yellow, cyan, magenta, and so on.
It should be noted that the method of the embodiment of the present disclosure may be executed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene and completed by the mutual cooperation of a plurality of devices. In such a distributed scenario, one of the devices may only perform one or more steps of the method of the embodiments of the present disclosure, and the devices may interact with each other to complete the method.
It should be noted that the above describes some embodiments of the disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiment of the disclosure also provides a display device, which has better brightness and chroma uniformity of full gray scale.
Fig. 3 shows a schematic diagram of an exemplary display device 200 according to an embodiment of the present disclosure.
As shown in fig. 3, the display device 200 may include a display module 202 and a control unit 204, wherein the display module 202 and the control unit 204 are electrically coupled. The display module 202 can display according to the display data provided by the control unit 204, and the control unit 204 can compensate the display data according to the segmented compensation curve calculated by the method 100 and then send the compensated display data to the display module 202 for display.
The AM miniLED display screen has the characteristics of high refresh rate, low flash, healthy eye protection, low power consumption and the like, and is a trend for future development of small-distance LED display screens. Since the AM miniLED is driven by current, and the LED has non-linear response curve to the brightness under different currents, the more complicated display characteristics of the AM miniLED cannot be satisfied by the conventional correction. Thus, in some embodiments, the display device 300 may be an AM miniLED display screen, and the pixels of the display device are miniLEDs. Therefore, the AM miniLED display screen is compensated by adopting the embodiment of the disclosure according to the segmented compensation curve calculated by the response characteristic of the miniLED in the AM driving mode, and a better compensation effect can be obtained.
In some embodiments, during compensation, the control unit 204 may first determine the target pixel point i and a current value corresponding to the display gray scale thereof; and then determining a compensation coefficient of the target pixel point i by combining a segmented compensation curve according to the current value, and finally compensating the display data corresponding to the target pixel point i based on the compensation coefficient of the target pixel point i. The target pixel point i may be any pixel point of the display device 200, and the compensation coefficient is determined for each pixel point of the display device 200 by the foregoing method.
For example, the piecewise compensation curve is divided into three segments, the first segment being (0, I1)]And the corresponding compensation coefficients are a first set of compensation coefficients C1, and the second segment is (I1, I2)]The corresponding compensation coefficient is a second group of compensation coefficients C2, and the third section is (I2, imax)]And the corresponding compensation coefficient is the third group compensationCoefficient C3. Assume that the input current of a certain pixel is I, and I 1 <I<I 2 Then, at this time, it is necessary to select the second set of compensation coefficients C2 corresponding to the second segment, and then perform pixel-level luminance and chrominance compensation according to the pixel compensation flow of fig. 2A.
Fig. 4A and 4B show comparative diagrams of the display device 200 before and after compensation. As can be seen from the figure, the uniformity of the compensated picture of fig. 4B is significantly better than that of the pre-compensated picture of fig. 4A. Therefore, the display effect of the display device 200 compensated by the method of the present disclosure is obviously improved.
Based on the same inventive concept, corresponding to the method 100 of any of the above embodiments, the present disclosure also provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the method 100 of any of the above embodiments is implemented.
Fig. 5 shows a hardware structure diagram of an exemplary computer device 300 provided by the embodiment of the present disclosure. The apparatus 300 may include: a processor 302, a memory 304, an input/output interface 306, a communication interface 308, and a bus 310. Wherein the processor 302, memory 304, input/output interface 306, and communication interface 308 are communicatively coupled to each other within the device via bus 310.
The processor 302 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present specification.
The Memory 304 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory 304 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 304 and called to be executed by the processor 302.
The input/output interface 306 is used for connecting an input/output module to realize information input and output. The i/o module may be configured as a component in a device (not shown) or may be external to the device to provide a corresponding function. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface 308 is used for connecting a communication module (not shown in the figure) to realize communication interaction between the device and other devices. The communication module can realize communication in a wired mode (for example, USB, network cable, etc.), and can also realize communication in a wireless mode (for example, mobile network, WIFI, bluetooth, etc.).
It should be noted that although the above-described device 300 only shows the processor 302, the memory 304, the input/output interface 306, the communication interface 308 and the bus 310, in a specific implementation, the device 300 may also include other components necessary for normal operation. Furthermore, those skilled in the art will appreciate that the apparatus 300 described above may also include only the components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.
The computer device 300 of the foregoing embodiment is used to implement the corresponding method 100 in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Based on the same inventive concept, corresponding to any of the above-described embodiment methods, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to perform the method 100 as described in any of the above embodiments.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, for storing information may be implemented in any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
The computer instructions stored in the storage medium of the foregoing embodiment are used to enable the computer to execute the method 100 according to any embodiment, and have the beneficial effects of the corresponding method embodiment, which are not described in detail herein.
The present disclosure also provides a computer program product comprising a computer program, corresponding to any of the embodiment methods 100 described above, based on the same inventive concept. In some embodiments, the computer program is executable by one or more processors to cause the processors to perform the method 100. Corresponding to the execution subject corresponding to each step in the embodiments of the method 100, the processor executing the corresponding step may be the corresponding execution subject.
The computer program product of the foregoing embodiment is used for enabling a processor to execute the method 100 according to any of the foregoing embodiments, and has the advantages of corresponding method embodiments, which are not described herein again.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the concept of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Further, devices may be shown in block diagram form in order to avoid obscuring embodiments of the disclosure, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations thereof will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures, such as Dynamic RAM (DRAM), may use the discussed embodiments.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.
Claims (14)
1. A method of compensating for luminance and chrominance of a display device, the display device comprising a plurality of pixels, the method comprising:
determining a target pixel point in the plurality of pixel points;
receiving preset optical parameters of the target pixel points under at least two current values;
calculating compensation coefficients of brightness values and chromatic values of the target pixel points under the at least two current values according to a preset relation curve of optical parameters and current values and by combining preset optical parameters of the target pixel points under the at least two current values and target optical parameters of the display device; wherein the predetermined optical parameter and the target optical parameter are the same optical parameter and are both related to luminance values and chrominance values;
determining a segmented compensation curve of the brightness value and the chromatic value of the target pixel point based on the compensation coefficients of the brightness value and the chromatic value of the target pixel point under the at least two current values, wherein the segmented compensation curve is used for compensating the brightness value and the chromatic value of the target pixel point;
determining a segmented compensation curve of the brightness value and the chromatic value of the target pixel point according to the compensation coefficients of the brightness value and the chromatic value of the target pixel point under the at least two current values, wherein the method comprises the following steps:
receiving at least two uniformity change curves of the display device respectively measured based on compensation coefficients of the brightness value and the chromatic value of each pixel point under the at least two current values;
determining at least one segmentation point according to the at least two homogeneity variation curves; and
and combining the at least two uniform change curves and the at least one segmentation point to determine the segmented compensation curve.
2. The method of claim 1, wherein determining the piecewise compensation curve in combination with the at least two uniform variation curves and the at least one piecewise point comprises:
determining an initial segmentation compensation curve according to the at least two homogeneity variation curves and the at least one segmentation point;
determining whether a point in the initial piecewise compensation curve that does not satisfy a uniformity difference threshold exists;
in response to determining that the initial segmentation compensation curve has a point which does not meet the uniformity difference threshold, determining a segment of the initial segmentation compensation curve where the point which does not meet the uniformity difference threshold is located;
determining two current values corresponding to the two segmentation points of the segment, increasing the smaller current value of the two current values by a preset increment value and decreasing the larger current value by the preset increment value to obtain two changed current values;
based on the two changed current values, calculating the compensation coefficients of the brightness value and the chromatic value of the target pixel point again; and
and determining the segmented compensation curve based on the re-calculated compensation coefficients of the brightness values and the chromatic values of the target pixel points.
3. The method of any of claims 1-2, wherein a number of current values in the at least two current values is n, a number of segments of the segmented compensation curve is n, and each segment of the segmented compensation curve corresponds to a set of compensation coefficients.
4. The method of claim 1, wherein the optical parameter is a spectral tristimulus value;
calculating compensation coefficients of brightness values and chromatic values of the target pixel points under the at least two current values according to a preset relation curve of optical parameters and current values and by combining preset optical parameters of the target pixel points under the at least two current values and target optical parameters of the display device, wherein the compensation coefficients comprise:
determining a first current value of the at least two different current values;
calculating a target spectrum stimulus value of the target pixel point under the first current value according to the spectrum tristimulus value of the target pixel point under the first current value and by combining the target spectrum tristimulus value of the display device;
determining a second current value corresponding to the target spectrum stimulus value according to a preset relation curve of optical parameters and the current value; and
and calculating compensation coefficients of the brightness value and the chromatic value of the target pixel point according to the first current value and the second current value.
5. The method of claim 4, wherein calculating the target spectral tristimulus value of the target pixel point at the first current value in combination with a target spectral tristimulus value of the display device based on the spectral tristimulus value of the target pixel point at the first current value comprises:
calculating a second spectral stimulus value Y of the target pixel point i under three primary colors i And a first spectral stimulus value X i Ratio of (a) i R 、α i G 、α i B And a third spectral stimulus value Z of the target pixel point i under three primary colors i And the first spectral stimulus value X i Ratio of (beta) i R 、β i G 、β i B (ii) a And
calculating the target spectral stimulus value of the target pixel point under the three primary colors under the first current value according to the following formula
Wherein, the first and the second end of the pipe are connected with each other,
is the target spectral tristimulus value of the display device.
6. The method of claim 5, wherein determining the second current value corresponding to the target spectral stimulus value according to a pre-set optical parameter versus current value curve comprises:
receiving a relation curve of preset optical parameters and current values of the target pixel point i under three primary colors; and
according to the target spectral stimulus value of the target pixel point under the three primary colors under the first current value
Determining a target spectrum stimulus value by combining a preset relation curve of optical parameters and current values of the target pixel point i under three primary colors
A corresponding second current value;
wherein the target spectral stimulus value
A second current value corresponding to a relation curve of preset optical parameters and current values of the target pixel point I under three primary colors is I' RR 、I′ RG 、I′ RB Target spectral stimulus value
The second current value corresponding to the relation curve of the preset optical parameters and the current values of the target pixel point I under the three primary colors is I' GR 、I′ GG 、I′ GB Target spectral stimulus value
The second current value corresponding to the relation curve of the preset optical parameters and the current values of the target pixel point I under the three primary colors is I' BR 、I′ BG 、I′ BB 。
7. The method of claim 6, wherein calculating compensation coefficients for the luminance value and the chrominance value of the target pixel point according to the first current value and the second current value comprises:
calculating the target spectral stimulus value
Corresponding second current value I' RR 、I′ RG 、I′ RB 、I′ GR 、I′ GG 、I′ GB 、I′ BR 、I′ BG 、I′ BB The ratio of the first current value to the second current value to obtain a compensation coefficient
Wherein the compensation coefficient
Compensation coefficients for principal components
For compensating the sub-component in red, compensating the coefficient
For compensating the sub-component in the case of green, the compensation factor
The coefficient is compensated for the minor component when compensating for blue.
8. The method of claim 1, further comprising:
determining a target color of three primary colors;
receiving the optical parameters corresponding to the target color of the display device at a plurality of current values;
and fitting to obtain a relation curve between the optical parameters and the current values corresponding to the target color based on the plurality of current values and the corresponding optical parameters, and taking the relation curve as the relation curve between the preset optical parameters and the current values corresponding to the target color.
9. A display device, comprising:
a display module configured to: displaying according to the display data; and
a control unit electrically coupled with the display module and configured to: receiving a piecewise compensation curve calculated using the method of any one of claims 1-8, and compensating the display data based on the piecewise compensation curve.
10. The display device of claim 9, wherein the display device is an active matrix miniLED display device, and the pixel points of the display device are minileds.
11. The display device of claim 9, wherein the control unit is configured to:
determining a target pixel point and a current value corresponding to a display gray scale of the target pixel point;
determining a compensation coefficient of the target pixel point according to the current value and by combining the segmented compensation curve; and
and compensating the display data corresponding to the target pixel point based on the compensation coefficient of the target pixel point.
12. A computer device comprising one or more processors, memory; and one or more programs, wherein the one or more programs are stored in the memory and executed by the one or more processors, the programs comprising instructions for performing the method of any of claims 1-8.
13. A non-transitory computer-readable storage medium containing a computer program that, when executed by one or more processors, causes the processors to perform the method of any one of claims 1-8.
14. A computer program product comprising computer program instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110995715.5A CN113724644B (en) | 2021-08-27 | 2021-08-27 | Method for compensating brightness and chroma of display device and related equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110995715.5A CN113724644B (en) | 2021-08-27 | 2021-08-27 | Method for compensating brightness and chroma of display device and related equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113724644A CN113724644A (en) | 2021-11-30 |
| CN113724644B true CN113724644B (en) | 2023-01-10 |
Family
ID=78678510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110995715.5A Active CN113724644B (en) | 2021-08-27 | 2021-08-27 | Method for compensating brightness and chroma of display device and related equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113724644B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114299858B (en) * | 2021-12-30 | 2023-09-12 | 京东方科技集团股份有限公司 | Method for compensating brightness and chromaticity of display device and related equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895566A (en) * | 2017-12-11 | 2018-04-10 | 天津大学 | It is a kind of that two-step method is compensated based on the liquid crystal pixel of S curve and logarithmic curve |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050248517A1 (en) * | 2004-05-05 | 2005-11-10 | Visteon Global Technologies, Inc. | System and method for luminance degradation reduction using thermal feedback |
| US8405585B2 (en) * | 2008-01-04 | 2013-03-26 | Chimei Innolux Corporation | OLED display, information device, and method for displaying an image in OLED display |
| JP2009276671A (en) * | 2008-05-16 | 2009-11-26 | Canon Inc | Light-emitting device |
| US20140313111A1 (en) * | 2010-02-04 | 2014-10-23 | Ignis Innovation Inc. | System and methods for extracting correlation curves for an organic light emitting device |
| CN103489405B (en) * | 2013-09-30 | 2015-09-16 | 京东方科技集团股份有限公司 | A kind of display compensation method, device and display bucking-out system |
| CN103700353B (en) * | 2013-12-17 | 2016-03-30 | 深圳市华星光电技术有限公司 | Signal of video signal acquisition methods and signal of video signal acquisition device |
| KR102360222B1 (en) * | 2015-06-16 | 2022-02-10 | 삼성디스플레이 주식회사 | Organic light emitting display device and driving method thereof |
| CN108877652A (en) * | 2018-06-27 | 2018-11-23 | 武汉华星光电半导体显示技术有限公司 | Optical compensation method and OLED display |
| CN109935206B (en) * | 2019-04-15 | 2021-08-20 | 京东方科技集团股份有限公司 | Neural network-based display device brightness compensation method, device and equipment |
-
2021
- 2021-08-27 CN CN202110995715.5A patent/CN113724644B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895566A (en) * | 2017-12-11 | 2018-04-10 | 天津大学 | It is a kind of that two-step method is compensated based on the liquid crystal pixel of S curve and logarithmic curve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113724644A (en) | 2021-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11056050B2 (en) | Display unit, image processing unit, and display method for improving image quality | |
| CN111161691B (en) | Compensation method and compensation device for display screen and display device | |
| KR101041882B1 (en) | Transforming three color input signals to more color signals | |
| US8654141B2 (en) | Techniques for adapting a color gamut | |
| CN110473502A (en) | Control method, device and the terminal device of screen intensity | |
| US8279234B2 (en) | Method and system of generating gamma data of display device | |
| JP5875423B2 (en) | Image processing apparatus and image processing method | |
| KR102590142B1 (en) | Display apparatus and control method thereof | |
| US10366673B2 (en) | Display device and image processing method thereof | |
| CN108122525B (en) | Display device and image processing method thereof | |
| US20170316754A1 (en) | Image processing device, display device, position determining device, position determining method, and recording medium | |
| JP2013536956A (en) | Adaptive color correction for displays with backlight modulation | |
| KR20080021984A (en) | Method and apparatus for processing image signal | |
| US20150281523A1 (en) | Conversion between color spaces | |
| US11651719B2 (en) | Enhanced smoothness digital-to-analog converter interpolation systems and methods | |
| US20140204007A1 (en) | Method and system for liquid crystal display color optimization with sub-pixel openings | |
| US11257443B2 (en) | Method for processing image, and display device | |
| CN113724644B (en) | Method for compensating brightness and chroma of display device and related equipment | |
| US9569999B2 (en) | Signal generation apparatus, signal generation program, signal generation method, and image display apparatus | |
| CN113920927B (en) | Display method, display panel and electronic equipment | |
| CN113139921B (en) | Image processing method, display device, electronic device and storage medium | |
| CN115171606A (en) | Image adjusting method and device, electronic equipment and storage medium | |
| US20200327840A1 (en) | Field-sequential image display device and image display method | |
| CN114299858B (en) | Method for compensating brightness and chromaticity of display device and related equipment | |
| JP2015227923A (en) | Image processing apparatus and control method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Mengmeng Inventor after: Zhang Zhitao Inventor after: Wang Xiurong Inventor after: Yang Tao Inventor after: Cao Shicai Inventor after: Shi Lingyun Inventor before: Wang Xiurong Inventor before: Zhang Zhitao Inventor before: Yang Tao Inventor before: Cao Shicai Inventor before: Shi Lingyun Inventor before: Wang Mengmeng |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |