CN114299858B - Method for compensating brightness and chromaticity of display device and related equipment - Google Patents
Method for compensating brightness and chromaticity of display device and related equipment Download PDFInfo
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Abstract
The disclosure provides a method and related equipment for compensating brightness and chromaticity of a display device. The display device includes a plurality of pixel points. The method comprises the following steps: determining an optical curve of the display device; acquiring at least two target optical parameters of a display device; determining at least two current segmentation points, and determining at least two current segmentation intervals according to the at least two current segmentation points; determining at least two compensation current values according to at least two target optical parameters and combining an optical curve; calculating a piecewise correction curve according to the at least two current piecewise points and the at least two compensation current values; at least two groups of compensation parameters corresponding to the at least two current segmentation intervals in the segmentation correction curve are determined, and the at least two groups of compensation parameters are stored so that each pixel point in the display device can carry out brightness and chromaticity compensation by determining corresponding compensation currents according to the at least two groups of compensation parameters.
Description
Technical Field
The disclosure relates to the field of display technologies, and in particular, to a method and related apparatus for compensating luminance and chromaticity of a display device.
Background
With the continuous development of modern technology, people have increasingly higher requirements on display quality, display functions, power consumption and the like of display devices. The active array mini light emitting diode (micro inorganic light emitting diode) display screen has the characteristics of high refresh rate, low stroboscopic, health eye protection, low power consumption and the like, and is a trend of future development of small-space light emitting diode (micro inorganic light emitting diode) display screens.
However, since the light emitting characteristics of the micro-inorganic light emitting diode have a non-linear characteristic in an active Array (AM) driving mode, the existing correction method can only determine the compensation coefficient of the pixel, but only compensate the pixel through the compensation coefficient, which affects the uniformity index of the transition gray scale of the pixel.
Disclosure of Invention
Accordingly, an objective of the present disclosure is to provide a method and related apparatus for compensating luminance and chromaticity of a display device.
In view of the above object, a first aspect of the present disclosure provides a method of compensating luminance and chromaticity of a display device including a plurality of pixel points, the method comprising:
determining an optical curve of the display device;
acquiring at least two target optical parameters of the display device;
Determining at least two current segmentation points, and determining at least two current segmentation intervals according to the at least two current segmentation points;
determining at least two compensation current values according to the at least two target optical parameters and combining the optical curves;
calculating a piecewise correction curve according to the at least two current piecewise points and the at least two compensation current values;
determining at least two groups of compensation parameters corresponding to the at least two current segmentation intervals in the segmentation correction curve, and storing the at least two groups of compensation parameters so that each pixel point in the display device can determine corresponding compensation current to carry out brightness and chromaticity compensation according to the at least two groups of compensation parameters;
wherein each set of compensation parameters includes: and compensating gain parameters and compensating offset parameters determined according to the piecewise correction curve.
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;
a memory configured to: receiving at least two groups of compensation parameters obtained by the method according to the first aspect, and storing the at least two groups of compensation parameters;
a control unit electrically coupled to the display module and the memory and configured to: and acquiring current display data of the display module, calling corresponding compensation parameters from the memory according to the current display data, calculating compensation current according to the compensation parameters, and controlling the display module to compensate the display data according to the compensation current.
In a third aspect of the disclosure, a computer device is provided that includes 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 the first aspect.
In a fourth aspect of the present 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.
As can be seen from the above description, the method for compensating the luminance and the chromaticity of the display device and the related apparatus provided by the present disclosure can divide the obtained piecewise correction curve into at least two current piecewise intervals, thereby obtaining at least two groups of compensation parameters composed of compensation gain parameters and compensation offset parameters, so that corresponding compensation gain parameters and compensation offset parameters can be determined for each pixel point of the display device, and further corresponding compensation currents can be determined according to the determined compensation gain parameters and compensation offset parameters, and luminance and chromaticity compensation can be performed for the pixel points of the display device according to the compensation currents. According to the scheme, the compensation gain parameter and the compensation offset parameter can be combined to determine more accurate compensation current, the uniformity index of the transition gray scale of the pixel point can be ensured, and the visual effect and the performance index of the display device are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the present disclosure or related art, the drawings required for the embodiments or related art description will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
FIG. 1A shows a flow diagram of an exemplary method provided by an embodiment of the present disclosure;
FIG. 1B shows a detailed flow diagram of the steps of calculating an optical curve according to an embodiment of the present disclosure;
FIG. 1C illustrates a detailed flow diagram of steps for obtaining a target optical parameter according to an embodiment of the present disclosure;
FIG. 1D illustrates a specific flow diagram of the step of determining at least two current segment points, according to an embodiment of the present disclosure;
FIG. 1E shows a schematic diagram of a uniformity variation curve obtained from the initial determination of three current segment points;
FIG. 1F illustrates a detailed flow diagram of the steps of determining a piecewise correction curve in accordance with an embodiment of the present disclosure;
FIG. 1G illustrates a detailed flow diagram of steps for determining and saving compensation parameters according to an embodiment of the present disclosure;
Fig. 1H shows a three-segment current interval (0,I 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]Schematic diagrams of the corresponding obtained piecewise correction curves;
FIG. 2A is a graph showing the relationship between the input current and the stimulus value X of a PM micro-inorganic light emitting diode display screen and an active driving mode micro-inorganic light emitting diode display screen;
FIG. 2B is a schematic flow chart of determining three corresponding compensation parameters for the micro-inorganic LED display in an active driving mode;
FIG. 3A shows a schematic diagram of an exemplary display device according to an embodiment of the present disclosure;
FIG. 3B shows a schematic diagram of correction errors for different bit number ratios at 16 bits;
fig. 4 shows a schematic hardware structure of an exemplary computer device provided by an embodiment of the disclosure.
Detailed Description
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains. The terms "first," "second," and the like, as used in embodiments of the present disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
In order to improve uniformity of luminance and chromaticity of a display device, embodiments of the present disclosure provide a method of compensating for luminance and chromaticity of a display device.
Fig. 1A shows 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 a micro inorganic light emitting diode display in an active driving mode, and the display device may include a plurality of pixels and a plurality of driving circuits, where the pixels are micro inorganic light emitting diodes, each driving circuit is configured to provide a driving signal to at least one pixel, and the driving circuits may be implemented by a micro integrated circuit chip or a combination of thin film transistors.
In the manufacturing process of the micro inorganic light emitting diode display, process fluctuation of uneven epitaxial thickness and material exists, so that micro inorganic light emitting diodes produced in different batches have differences in photoelectric parameters, and when the micro inorganic light emitting diodes are arranged on a single substrate to form a single display module, and then a plurality of single display modules are spliced into a large-size display screen to play pictures, uneven phenomena such as mottle, mosaic, screen pattern and the like can appear on the pictures.
Based on this, the provided exemplary method 100 of the present embodiment, as shown in fig. 1A, may include the following steps.
The display device may be formed by a single display module or by splicing a plurality of display modules, and the present disclosure preferably performs luminance and chromaticity compensation processing for the display device formed by splicing a plurality of display modules.
Generally, after each lot of leds is produced by an led manufacturer, the leds need to be divided into bins according to the optical parameters of each led. Specifically, the leds may be classified according to their optical parameters, and leds with optical parameters within the same set range may be packaged into a bin. The optical parameters used in the division of the bin may include chromaticity, brightness, voltage, and the like. The micro inorganic light emitting diode on each display module in the display device is ensured to belong to the same bin, and the display performance of the display module is ensured.
Thus, the method 100 can be utilized to compensate for the display device of the same specification (micro-inorganic light emitting diode display, or display utilizing micro-inorganic light emitting diodes (or micro-inorganic light emitting diodes, micro-inorganic light emitting diodes) as backlight) of the display device under test in the following process.
In step 101, an optical curve of the display device is determined.
For ease of calculation, discrete relationship data of the optical parameter and the current value is not stored in the computer device. Therefore, in the present embodiment, the relationship between the optical parameter and the current value is processed into an optical curve.
In this embodiment, for ease of calculation, the optical parameter is selected from the spectrum tristimulus values of the CIE1931 standard chromaticity observer. For example, a spectral stimulus value X is selected.
The optical curve may be obtained by measuring the luminance-current curve of each display module constituting the display device using an acquisition device (for example, CA410 device) and summing and averaging the luminance-current curves of all the display modules of the display device.
However, since all the display modules are time-consuming and labor-consuming to measure, preferably, the luminance-current curves are measured from the plurality of display modules in the predetermined area selected from the display device by using the acquisition device (for example, the CA410 device), and the luminance-current curves of the plurality of display modules in the predetermined area are summed and averaged to obtain the optical curve.
In step 101, optical curves corresponding to three colors (i.e., three colors of RGB) can be calculated for three primary colors in the display area.
Fig. 1B shows a specific flow diagram of step 101 of calculating an optical curve according to an embodiment of the present disclosure. As shown in fig. 1B, in some embodiments, step 101 may further comprise the following steps.
In step 1011, a target color of the three primary colors is determined. For example, blue is selected from red, green, and blue as the target color. The other colors (other two colors than the target color) for the three primary colors are processed in the following steps 1012 and 1013, thereby obtaining three optical curves corresponding to the three colors, respectively.
Step 1012, obtaining current values corresponding to a plurality of optical parameters corresponding to the target color of the display device, and formulating a relationship curve between the optical parameters of the target color and the current values. Wherein the optical parameters include: chromaticity, luminance, voltage, etc., luminance is preferably an optical parameter in this embodiment.
Dividing the current of the display device into 2 according to the preset gray-scale bit number b b A current gear. Measuring said 2 respectively b The target color (e.g., red/green/blue 2 b And a luminance value. In the measurement process, aiming at a display device formed by splicing a plurality of display modules, the central area of each display module in a preset area in the display device is selected for measurement, namely, a circular area with equal distance from four edges of the display module is selected as the central area, and the probe size of the brightness measurement equipment and the circular area are in congruent graphics, so that the brightness of the corresponding area can be conveniently collected.
2 according to the measured target color b The individual current values establish a luminance versus current value curve for the target color.
In general, in order to ensure the display quality of a display device, it is necessary to divide micro-inorganic light emitting diodes according to specification parameters (wavelength/brightness/voltage (same current)), which are called BIN-dividing. And the BINs are divided according to different ranges, so that the micro inorganic light emitting diodes on each display module in the display device are ensured to belong to the same BIN, and the display performance of the display module is ensured.
Step 1013, fitting the optical parameter and current value relation curve of the target color, and performing inverse function processing on the fitted optical parameter and current value relation curve of the target color to obtain the optical curve of the target color. For example, the obtained optical parameter (e.g., luminance value L) and current value I have a curve formula of l=f (I), and the inverse function process obtains I '=f' (L).
Fitting the optical parameter versus current value curve can facilitate subsequent calculations, and the form of the fitted curve includes, but is not limited to, straight line fitting and exponential curve fitting. The fitting mode adopts a least square method for fitting. The formula obtained after fitting is l=f (I), i.e., L-I curve (luminance-current curve). In theory, it is preferable to collect and fit the corresponding relation between the brightness and the current of all the display modules of the display device, however, this requires a long operation time, so that the brightness-current curve of the display module in the predetermined area in the display device can be collected, and the sum and the average can be performed to obtain f (I), and f (I) in the predetermined area is taken as f (I) of the display device.
In order to facilitate the subsequent processing, an inverse function processing is required to be performed on the relation curve between the optical parameter and the current value, so as to obtain I '=f' (L), wherein I 'refers to the current gear after corresponding compensation, and f' (L) is an inverse function of l=f (I).
In step 102, at least two target optical parameters of the display device are acquired. Wherein the target optical parameter selects the average brightness value of the display device.
Fig. 1C illustrates a specific flow diagram of step 102 of acquiring a target optical parameter according to an embodiment of the present disclosure. As shown in fig. 1C, in some embodiments, step 102 may further comprise the following steps.
At step 1021, at least two initial gray levels are determined. The selected number of the initial gray scales is selected according to the corresponding current segmentation requirement, and two sections, three sections, four sections and the like can be selected. For example, the number of current segments is 3, and three gray scales of 90, 160, 224 can be selected as the initial gray scales.
Step 1022, determining at least two initial current segmentation points corresponding to the at least two initial gray scales according to the gray scale and current correspondence table (i.e., gamma table).
For example, for three gray scales selected to be determined 90, 160, 224, corresponding current values are determined as three initial current segment points (I First 1 、I First 2 、I First 3 )。
Step 1023, collecting average brightness values corresponding to each initial current segmentation point in the at least two initial current segmentation points by using a full-screen point-by-point brightness collection device to obtain at least two average brightness values, and taking the at least two average brightness values as the at least two target optical parameters.
And acquiring the brightness value of each pixel point in the display device under each initial current segmentation point by using full-screen point-by-point brightness acquisition equipment. Such that each initial electricityThe stream segmentation points correspondingly obtain a group of brightness values, and a corresponding brightness average value is calculated for each group of brightness values. For example, three initial current segment points (I First 1 、I First 2 、I First 3 ) Three sets of luminance averages were obtained. This way, subsequent compensation according to the average luminance value may reduce the luminance loss.
In step 103, at least two current segmentation points are determined based on the target optical parameter, and at least two current segmentation intervals are determined according to the at least two current segmentation points.
The corresponding at least two current segmentation points can be three, four, ten and other N current segmentation points, wherein N is more than or equal to 2, and the embodiment is preferably three current segmentation points.
Fig. 1D shows a specific flow diagram of step 103 of determining at least two current segmentation points, according to an embodiment of the present disclosure. As shown in fig. 1D, in some embodiments, step 103 may further comprise the following steps.
Step 1031, determining at least two homogeneity variation curves corresponding to the at least two initial current segmentation points respectively.
Specifically, a uniformity calculation formula is usedCalculating uniformity value at each gray level (0-255 gray levels), wherein L i For the brightness values corresponding to different gray scales, the brightness average value average is obtained by measuring brightness values corresponding to a plurality of (for example, 9) points on each display module in the display device corresponding to each initial current segmentation point by using an optical measuring instrument (for example, CA 410), and averaging the brightness values. And adding and averaging the uniformity data corresponding to each display module in the display device to obtain a final uniformity value. Thus, each initial current segment point corresponds to a set of uniformity values at each gray level (0-255 gray levels). And drawing a uniformity change curve corresponding to each initial current segmentation point according to the uniformity values.
For example, the above-described allocated initial current segment points have three (I First 1 、I First 2 、I First 3 ) Three uniformity variation curves are correspondingly obtained.
Step 1032, using at least two crossing points of the at least two uniformity profiles as the at least two current segment points.
Specifically, since the micro-inorganic light emitting diode in the active driving mode adopts the AM driving mode, the L-I curve obtained correspondingly is nonlinear, so that a certain group of initial current segmentation points can only ensure uniformity within a certain gray scale range, and when the gray scale is far away from the range, the uniformity is rapidly reduced, and therefore, at least two uniformity change curves must have crossing points. And determining a current value corresponding to the intersection point, and taking the current value as a current segmentation point.
For example, fig. 1E shows a schematic diagram of a uniformity variation curve obtained from three current segment points initially determined. As shown in fig. 1E, there are three initial current segment points (I First 1 、I First 2 、I First 3 ) Three homogeneity change curves are correspondingly obtained, three intersection points exist in the coordinate system of the three homogeneity change curves, and current values (I 1 、I 2 、I 3 ) As a current segmentation point. Thus, three current intervals (0,I) 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]。
Step 104, determining at least two compensation current values according to the at least two target optical parameters and combining the optical curves.
Specifically, according to the obtained at least two target optical parameters (for example, the average value L of the brightness of the full-screen pixels of the display device obtained by splicing a plurality of display modules target ) According to the inverse function I '=f' (L target ) And calculating at least two compensation current values corresponding to the at least two target optical parameters.
For example, the average value of the three sets of luminance obtained in step 1023 is input to I '=f' (L target ) Correspondingly obtain three compensation current values (I' 1 、I’ 2 、I’ 3 ) That is to say I 1 Corresponding to the corrected valueIs I' 1 ，I 2 The corresponding corrected value is I' 2 ，I 3 The corresponding corrected value is I' 3 。
Step 105, calculating a piecewise correction curve according to the at least two current piecewise points and the at least two compensation current values. The obtained segmentation correction curve has at least two segmentation intervals, and the number of the segmentation intervals is equal to that of the current segmentation points.
Fig. 1F shows a specific flow diagram of step 105 of determining a piecewise correction curve in accordance with an embodiment of the present disclosure. As shown in fig. 1F, in some embodiments, step 105 may further comprise the following steps.
And step 1051, obtaining at least two current segmentation intervals according to the at least two current segmentation points. For example, three current segment points (I 1 、I 2 、I 3 ) Will correspondingly obtain three current intervals (0,I 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]。
Step 1052, determining correction curves corresponding to the at least two current segmentation intervals respectively based on the optical curves, so as to obtain at least two correction curves.
And calculating a correction curve corresponding to each current segmentation interval according to the formula correction coefficient=the compensated current value I'/the original current value I. For example, the compensated current value I ' is the corresponding (I ' obtained according to the above steps ' 1 、I’ 2 、I’ 3 ) The original current value I is obtained according to the above procedure (I 1 、I 2 、I 3 ) Three sets of correction coefficients are obtained correspondingly, and three (0,I) are obtained based on the three correction coefficients 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]A corresponding correction curve.
Under the action of an AM driving mode, when the current is far away from a corresponding current segmentation interval, the correction effect can be rapidly reduced, and particularly, referring to a graph, a current range between two current segmentation points is a transition current region (a transition gray scale region is mapped onto a gamma table), so that the situation of uniformity deficiency can be caused by correcting by simply relying on a correction coefficient.
Based on the above, the following procedure of step 1053 is adopted.
Step 1053, fitting the at least two correction curves to determine a piecewise correction curve by combining the at least two current piecewise points and the at least two compensation current values.
The obtained piecewise correction curve corresponds to a plurality of piecewise intervals. The formula of the corresponding obtained piecewise correction curve is I '=Amp, I+bias, I' is the compensated current value, I is the current value, amp is the compensation gain parameter, bias is the compensation offset parameter.
For example, for the three-segment current interval (0,I 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]Wherein the first segment fitting formula isThe fitting formula of the second section is +.>The fitting formula of the third section is
And 106, determining at least two groups of compensation parameters corresponding to the at least two current segmentation intervals in the segmentation correction curve, and storing the at least two groups of compensation parameters so that each pixel point in the display device can determine corresponding compensation current to carry out brightness and chromaticity compensation according to the at least two groups of compensation parameters.
Wherein each set of compensation parameters includes: and compensating gain parameters and compensating offset parameters determined according to the piecewise correction curve.
In the implementation, since the piecewise correction curves are different in each current piecewise interval, a plurality of pieces of compensation curves are correspondingly obtained, and the piecewise correction curves in each current piecewise interval belong to straight lines. The formulas corresponding to the straight lines can be the same or different, so that each current segmentation interval corresponds to a group of compensation gain parameters and compensation offset parameters, and each group of compensation gain parameters and compensation offset parameters can be stored as compensation parameters.
Fig. 1G illustrates a specific flow diagram of step 106 of determining and saving compensation parameters according to an embodiment of the present disclosure. As shown in fig. 1G, in some embodiments, step 106 may further comprise the following steps.
In step 1061, the formula of the obtained piecewise correction curve is determined as I' =amp×i+bias.
Step 1062, obtaining at least two groups of amps and bias in the formula of the piecewise correction curve according to the at least two current piecewise intervals.
For example, FIG. 1H shows a three-segment current interval (0,I 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]As can be seen from fig. 1H, three sets of compensation parameters (Amp 01 ,Bias 01 ),(Amp 12 ,Bias 12 ),(Amp 23 ,Bias 23 )。
Step 1063, storing at least two sets of amps and bias as the at least two sets of compensation parameters.
In some embodiments, the at least two sets of compensation parameters can be stored in hardware. At least two sets of compensation parameters are stored in a hardware memory (e.g., a memory), so that the storage space can be saved without storing the calculation formula of the whole piecewise correction curve.
In some embodiments, the number of the at least two current segment points is n, the number of segments of the segment correction curve is n, and each segment of the segment correction curve corresponds to a set of compensation parameters consisting of a compensation gain parameter and a compensation offset parameter.
According to the foregoing, the at least two groups of compensation parameters are compensation parameters corresponding to different current segments, and when the input current of the display device is located in a certain segment, the compensation parameters corresponding to the segment are selected for compensation.
Fig. 2A shows a graph of input current versus stimulus value X for a passive matrix drive mode (PM) micro-inorganic light emitting diode display and an active drive mode (AM) micro-inorganic light emitting diode display. As can be seen from fig. 2A, the PM (passive matrix) micro-inorganic light emitting diode display is linear with the stimulus value X. The micro inorganic light emitting diode display screen in an active driving mode has the characteristics of high refresh rate, low stroboscopic frequency, healthy eye protection, low power consumption and the like, and is a trend of future development of the micro inorganic light emitting diode display screen. Since the micro-inorganic light emitting diode is a current driven element, and the brightness response curve of the micro-inorganic light emitting diode for different currents is nonlinear, the conventional correction cannot meet the more complex display characteristics of the micro-inorganic light emitting diode in an active driving mode.
Therefore, the linear compensation mode cannot well compensate the micro inorganic light emitting diode display screen in the active driving mode, and the piecewise correction curve disclosed by the invention can well respond to the compensation condition of the micro inorganic light emitting diode display screen in the active driving mode. It will be appreciated that the stimulus value X (or stimulus value Y, Z) has a corresponding conversion relationship with luminance and chromaticity, and thus, the characteristics of the optical curve reflected on the stimulus value X are correspondingly applicable to the relationship between luminance, chromaticity and current value.
Fig. 2B shows a flow chart of determining three corresponding compensation parameters for the micro-led display in the active driving mode. As shown in fig. 2B:
in step 201, a micro-inorganic light emitting diode characteristic curve L-I (i.e., an optical curve) is measured.
Step 202, fitting characteristic curves of the micro-inorganic light-emitting diode (fitting parameters only participate in software calculation).
Step 203, for the determined initial current segment point I First 1 ，I First 2 ，I First 3 And (5) collecting pixel-by-pixel brightness.
In step 204, a target value is selected, i.e. the average luminance is measured (three average luminances are obtained).
Step 205, measurement displayI of the display device First 1 ，I First 2 ，I First 3 The corresponding uniformity profile (see fig. 1E).
Step 206, determining corresponding current segmentation points I according to the intersection points corresponding to the uniformity change curves 1 ，I 2 ，I 3 Three segmented intervals (0,I) 1 ]、(I 1 ，I 2 ]、(I 2 ，I 3 ]。
Step 207, by compensating formula I '=f' (L target ) Calculating to obtain compensated current I 'corresponding to three average brightness' 1 ，I’ 2 ，I’ 3 。
Step 208, determining correction curves corresponding to the three current segmentation intervals respectively;
step 209, based on current segmentation point I 1 ，I 2 ，I 3 And compensated current I' 1 ，I’ 2 ，I’ 3 And (3) performing linear fitting on the three correction curves to obtain a fitted piecewise correction curve (shown in fig. 1H).
Step 210, obtaining final compensation parameters (Amp according to the piecewise correction curve 01 ,Bias 01 )，(Amp 12 ,Bias 12 )，(Amp 23 ,Bias 23 )。
Step 211, storing the three sets of compensation parameters into a hardware flash (flash) memory.
Therefore, if the pixel point is required to be compensated subsequently, only the current of the pixel point is required to be measured, the subsection interval which the current belongs to is determined according to the current, the corresponding compensation parameter is called from the flash memory according to the subsection interval, the compensation current of the pixel point is calculated, and the pixel point is compensated according to the compensation current. The compensation parameters are stored in a hardware storage mode,
according to the method for compensating the brightness and the chromaticity of the display device, the display device is compensated through the obtained at least two groups of compensation parameters, and a good compensation effect can be obtained. Further, when the display device is a micro inorganic light emitting diode display screen in an active driving mode, according to the response characteristics of the micro inorganic light emitting diode in an AM driving mode, the method for compensating the luminance and the chromaticity of the display device provided by the embodiment of the disclosure can divide the obtained segmentation correction curve into at least two current segmentation intervals, so as to obtain at least two groups of compensation parameters composed of compensation gain parameters and compensation offset parameters, so that the corresponding compensation gain parameters and compensation offset parameters can be determined for each pixel point of the display device, and further the corresponding compensation current is determined according to the determined compensation gain parameters and compensation offset parameters, and the luminance and the chromaticity of the pixel point of the display device are compensated according to the compensation current. According to the scheme, the compensation gain parameter and the compensation offset parameter can be combined to determine more accurate compensation current, the uniformity index of the transition gray scale of the pixel point can be ensured, and the visual effect and the performance index of the display device are greatly improved.
It can be appreciated that the method for compensating the luminance and the chromaticity of the display device provided by the embodiments of the present disclosure may be used for compensating an active light emitting display device (for example, an OLED display, a micro inorganic light emitting diode display, etc.), or compensating a backlight source of a passive light emitting display device (for example, a liquid crystal display), and various display devices may select the method provided by the embodiments of the present disclosure to compensate the luminance and the chromaticity according to actual needs.
In the embodiments of the present disclosure, RGB three primary colors are taken as examples for illustration, it is understood that other colors may be selected for parameter calculation, for example, yellow, cyan, magenta, and the like.
It should be noted that the method of the embodiments of the present disclosure may be performed 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 is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the methods of embodiments of the present disclosure, the devices interacting with each other to accomplish the methods.
It should be noted that the foregoing describes some embodiments of the present 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 are also possible or may be advantageous.
The embodiment of the disclosure also provides a display device with good full gray scale brightness uniformity.
Fig. 3A shows a schematic diagram of an exemplary display device 300 according to an embodiment of the disclosure.
As shown in fig. 3A, the display device 300 may include a display module 301, a memory 302, and a control unit, with which the display module 301 and the memory 302 are electrically coupled. The display module 301 may display according to the display data provided by the control unit; a memory 302 configured to: receiving at least two groups of compensation parameters obtained by adopting the method 100, and storing the at least two groups of compensation parameters; the control unit obtains the current display data of the display module 301, retrieves corresponding compensation parameters from the memory 302 according to the current display data, calculates compensation current according to the compensation parameters, and controls the display module 301 to compensate the display data according to the compensation current.
The micro inorganic light emitting diode display screen in an active driving mode has the characteristics of high refresh rate, low stroboscopic frequency, healthy eye protection, low power consumption and the like, and is a trend of future development of the micro inorganic light emitting diode display screen. Since the micro-inorganic light emitting diode is a current driven element, and the brightness response curve of the micro-inorganic light emitting diode for different currents is nonlinear, the conventional correction cannot meet the more complex display characteristics of the micro-inorganic light emitting diode in an active driving mode. Accordingly, in some embodiments, the display device 300 may be a micro-inorganic light emitting diode display screen in an active driving mode, and the pixels of the display device 300 are micro-inorganic light emitting diodes.
In this way, according to the embodiment of the disclosure, at least two groups of compensation parameters obtained by calculating according to the response characteristics of the micro inorganic light emitting diode in the AM driving mode are stored by using the memory 302, and the hardware storage mode is simple and convenient.
In some embodiments, in performing the compensation, the control unit is specifically configured to:
determining a current value corresponding to a display gray scale of a target pixel point in the display module 301; determining a target segment interval of the current value in at least two current segment intervals, and acquiring target compensation parameters of the target segment interval, wherein the target compensation parameters comprise: a target compensation gain parameter and a target compensation offset parameter; and calculating the compensation current of the target pixel point according to the target compensation gain parameter and the target compensation offset parameter, and controlling the display module 301 to compensate the target pixel point according to the compensation current.
Specifically: the output current value I corresponding to the target pixel is obtained, a target current segment section in which the current value I is located is determined, and target compensation parameters (a target compensation gain parameter and a target compensation offset parameter) of the target current segment section are retrieved from the memory 302. And using the current value obtained by the I-target compensation gain parameter and the target compensation offset parameter as compensation current, and performing current compensation on the target pixel point according to the compensation current, so that the brightness and the chromaticity of the target pixel point are adapted to surrounding pixel points. The uniformity of brightness and chromaticity of transition gray levels is effectively improved.
The target pixel i may be any pixel of the display device 300, and the compensation is performed in the foregoing manner for each pixel of the display device 300.
For example, the compensation parameters are divided into three groups: the first group is a current interval (0,I 1 ]Corresponding compensation parameters (Amp 01 ，Bias 01 ) The second group is a current interval (I 1 ，I 2 ]Corresponding compensation parameters (Amp 12 ，Bias 12 ) The third group is a current interval (I 2 ，I 3 ]Corresponding compensation parameters (Amp 23 ，Bias 23 ) Let the input current of a pixel be I, and I 1 ＜I 2 Then at this point it is necessary to select (Amp 12 ，Bias 12 ) Then calculate the corresponding compensation current I' =amp 12 *I+Bias 12 And performing brightness compensation at the pixel level according to the obtained I'.
In some embodiments, the memory is configured to, with the compensation accuracy guaranteed: and storing the compensation gain parameter by using a first storage bit width, and storing the compensation offset parameter by using a second storage bit width. The first storage bit width and the second storage bit width can be adjusted according to actual needs, specific numerical values are not limited herein, and the storage bit widths corresponding to the compensation gain parameter and the compensation offset parameter can be determined specifically through the proportion of the compensation gain parameter and the compensation offset parameter.
Fig. 3B shows a schematic diagram of correction errors for different bit number ratios at 16 bits.
As shown in fig. 3B, the compensation parameters are stored in a hardware storage mode, and the ordinate is the corresponding correction error (that is, the deviation between the actual corrected data (brightness and chromaticity) and the theoretical corrected data) of the hardware storage mode, because the hardware storage mode can only store data with the accuracy similar to 8/16/32bit and the like, and the accuracy calculated by software can be arbitrarily high, the hardware storage mode has to have correction error when storing the correction parameters. The abscissa is the number of bits occupied by the compensation gain parameter in the correction coefficient. The different curves in fig. 3B represent different bit numbers (e.g., 1bit/2bit/3bit/4bit/5 bit) occupied by the compensation offset, and the curves in fig. 3B correspond one-to-one to the bit numbers. It can be seen from fig. 3B that the compensation gain parameter belongs to an inflection point when the compensation gain parameter is 11 bits, the value after the compensation gain parameter selects 11 bits is meaningless, so that the bit width occupied by the sum of the compensation gain parameter and the compensation offset parameter is 16 bits, and the ratio of the compensation gain parameter to the compensation offset parameter is 11: and 5, the first storage bit width in the process is 11 bits, and the second storage bit width is 5 bits.
The storage of each group of compensation parameters in the hardware storage is easy to realize, and because the corresponding piecewise correction curve consists of compensation straight lines corresponding to each current interval, when the pixel points are required to be compensated, only one group of compensation parameters corresponding to the memory is required to be called, and then the corresponding compensation current can be obtained by using the multiplier and the adder, so that the operation is simple and quick, and the brightness and the chromaticity of the pixel points of the display device can be compensated according to the compensation current.
Based on the same inventive concept, corresponding to the method 100 of any embodiment described above, the present disclosure further provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the method 100 of any embodiment described above when executing the program.
Fig. 4 shows a schematic hardware architecture of an exemplary computer device 400 provided by an embodiment of the present disclosure. The apparatus 400 may include: a processor 402, a memory 404, an input/output interface 406, a communication interface 408, and a bus 410. Wherein the processor 402, the memory 404, the input/output interface 406, and the communication interface 408 are communicatively coupled to each other within the device via a bus 410.
The processor 402 may be implemented by a general-purpose CPU (Central Processing Unit ), a microprocessor, an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, etc. for executing relevant programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 404 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory ), static storage device, dynamic storage device, or the like. Memory 404 may store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present specification are implemented in software or firmware, relevant program codes are stored in memory 404 and invoked for execution by processor 402.
The input/output interface 406 is used to connect with an input/output module to achieve information input and output. The input/output module may be configured as a component in a device (not shown) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
The communication interface 408 is used to connect a communication module (not shown in the figure) to enable communication interaction of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).
Bus 410 includes a path to transfer information between components of the device (e.g., processor 402, memory 404, input/output interface 406, and communication interface 408).
It should be noted that although the device 400 described above only shows the processor 402, the memory 404, the input/output interface 406, the communication interface 408, and the bus 410, in a specific implementation, the device 400 may also include other components necessary to achieve proper operation. Furthermore, those skilled in the art will appreciate that the apparatus 400 may also include only the components necessary to implement the embodiments of the present disclosure, and not all of the components shown in the figures.
The computer device 400 of the foregoing embodiment is configured to implement the corresponding method 100 of any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which is not described herein.
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-described embodiments.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer 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 Discs (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 storage medium of the foregoing embodiments stores computer instructions for causing the computer to perform the method 100 as described in any of the foregoing embodiments, and has the advantages of the corresponding method embodiments, which are not described herein.
Based on the same inventive concept, the present disclosure also provides a computer program product, corresponding to any of the embodiment methods 100 described above, comprising a computer program. In some embodiments, the computer program is executable by one or more processors to cause the processors to perform the described method 100. Corresponding to the execution bodies to which the steps in the embodiments of the method 100 correspond, the processor that executes the corresponding step may belong to the corresponding execution body.
The computer program product of the above embodiment is configured to cause a processor to perform the method 100 of any of the above embodiments, and has the advantages of the corresponding method embodiments, which are not described herein.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present disclosure, the 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 details for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present disclosure. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present disclosure, and this also accounts for the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present disclosure are to be implemented (i.e., such 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 embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the embodiments of the disclosure, are intended to be included within the scope of the disclosure.
Claims (13)
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 an optical curve of the display device;
acquiring at least two target optical parameters of the display device;
determining at least two current segmentation points, and determining at least two current segmentation intervals according to the at least two current segmentation points;
determining at least two compensation current values according to the at least two target optical parameters and combining the optical curves;
calculating a piecewise correction curve according to the at least two current piecewise points and the at least two compensation current values;
determining at least two groups of compensation parameters corresponding to the at least two current segmentation intervals in the segmentation correction curve, and storing the at least two groups of compensation parameters so that each pixel point in the display device can determine corresponding compensation current to carry out brightness and chromaticity compensation according to the at least two groups of compensation parameters;
Wherein each set of compensation parameters includes: a compensation gain parameter and a compensation offset parameter determined according to the piecewise correction curve;
determining at least two groups of compensation parameters corresponding to the at least two current segmentation intervals in the segmentation correction curve, and storing the at least two groups of compensation parameters, wherein the method comprises the following steps:
the formula of the obtained piecewise correction curve is determined as I '=Amp, I+bias, I' is a compensated current value, I is a current value, amp is a compensation gain parameter, bias is a compensation offset parameter;
obtaining at least two groups of Amp and bias in a formula of the segmentation correction curve according to the at least two current segmentation intervals;
at least two sets of amps and bias are stored as the at least two sets of compensation parameters.
2. The method of claim 1, wherein acquiring at least two target optical parameters of the display device comprises:
determining at least two initial gray scales;
determining at least two initial current segmentation points corresponding to the at least two initial gray scales according to a gray scale and current corresponding relation table;
and acquiring average brightness values corresponding to each initial current segmentation point in the at least two initial current segmentation points by using full-screen point-by-point brightness acquisition equipment to obtain at least two average brightness values, wherein the at least two average brightness values are used as the at least two target optical parameters.
3. The method of claim 2, wherein the determining at least two current segment points comprises:
determining at least two homogeneity change curves corresponding to the at least two initial current segmentation points respectively;
at least two crossing points of the at least two homogeneity curves are taken as the at least two current segmentation points.
4. The method of claim 1, wherein calculating a piecewise correction curve from the at least two current piecewise points and at least two compensation current values comprises:
obtaining at least two current segmentation intervals according to the at least two current segmentation points;
determining correction curves corresponding to the at least two current segmentation intervals respectively based on the optical curves to obtain at least two correction curves;
and fitting the at least two correction curves by combining the at least two current segmentation points and the at least two compensation current values to determine a segmentation correction curve.
5. The method of claim 1, wherein the at least two sets of compensation parameters are capable of being stored in hardware.
6. The method of any of claims 1 to 5, wherein the number of the at least two current segment points is n, the number of segments of the segment correction curve is n, and each segment of the segment correction curve corresponds to a set of compensation parameters consisting of a compensation gain parameter and a compensation offset parameter.
7. The method of claim 1, wherein determining the optical curve of the display device comprises:
determining a target color of the three primary colors;
acquiring current values respectively corresponding to a plurality of optical parameters corresponding to the target color of the display device, and formulating a relation curve of the optical parameters and the current values of the target color;
fitting the relation curve of the optical parameters of the target color and the current value, and performing inverse function processing on the fitted relation curve of the optical parameters of the target color and the current value to obtain the optical curve of the target color.
8. A display device, comprising:
a display module configured to: displaying according to the display data;
a memory configured to: receiving at least two sets of compensation parameters obtained by the method of any one of claims 1 to 7, and storing the at least two sets of compensation parameters;
a control unit electrically coupled to the display module and the memory and configured to: and acquiring current display data of the display module, calling corresponding compensation parameters from the memory according to the current display data, calculating compensation current according to the compensation parameters, and controlling the display module to compensate the display data according to the compensation current.
9. The display device of claim 8, wherein the display device is an active matrix micro-inorganic light emitting diode display device and the pixels of the display device are micro-inorganic light emitting diodes.
10. The display device according to claim 8, wherein the control unit is configured to:
determining a current value corresponding to a display gray scale of a target pixel point in the display module;
determining a target segment interval of the current value in at least two current segment intervals, and acquiring target compensation parameters of the target segment interval, wherein the target compensation parameters comprise: a target compensation gain parameter and a target compensation offset parameter;
and calculating the compensation current of the target pixel point according to the target compensation gain parameter and the target compensation offset parameter, and controlling the display module to compensate the target pixel point according to the compensation current.
11. The display device of claim 8, wherein the memory is configured to:
and storing the compensation gain parameter by using a first storage bit width, and storing the compensation offset parameter by using a second storage bit width.
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 1-7.
13. 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 any of claims 1 to 7.
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