CN114299858B - Method for compensating brightness and chromaticity of display device and related equipment - Google Patents

Abstract

The present disclosure provides a method and related equipment for compensating the brightness and chromaticity of a display device. The display device includes a plurality of pixels. The method includes: determining the optical curve of the display device; obtaining 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 based on the at least two current segmentation points; Two target optical parameters, combined with the optical curve, determine at least two compensation current values; calculate a segmented correction curve based on at least two current segmentation points and at least two compensation current values; determine at least two current segmentation intervals in the segmentation At least two sets of compensation parameters corresponding to the correction curve are saved, so that each pixel point in the display device determines corresponding compensation currents for brightness and chromaticity compensation based on at least two sets of compensation parameters.

Description

Method and related equipment for compensating brightness and chromaticity of display device

Technical field

The present disclosure relates to the field of display technology, and in particular, to a method and related equipment for compensating the brightness and chromaticity of a display device.

Background technique

With the continuous development of modern technology, people have higher and higher requirements for the display quality, display function and power consumption of display devices. The active array mini light-emitting diode (miniature inorganic light-emitting diode with active driving mode) display has the characteristics of high refresh rate, low flicker, healthy eye protection, low power consumption, etc. It is a small-pitch light-emitting diode (micro-inorganic light-emitting diode) display. future development trends.

However, due to the non-linear characteristics of the light-emitting characteristics of micro-inorganic light-emitting diodes in the active array (AM) driving mode, the existing correction methods can usually only determine the compensation coefficient of the pixel, but only compensate the pixel through the compensation coefficient. , which will affect the uniformity index of the transition gray level of the pixel.

Contents of the invention

In view of this, the purpose of the present disclosure is to provide a method and related equipment for compensating the brightness and chromaticity of a display device.

Based on the above objectives, the first aspect of the present disclosure provides a method for compensating the brightness and chromaticity of a display device, where the display device includes a plurality of pixels. The method includes:

Determining the optical curve of the display device;

Obtaining at least two target optical parameters of the display device;

Determine at least two current segmentation points, and determine at least two current segmentation intervals based on the at least two current segmentation points;

Determine at least two compensation current values based on the at least two target optical parameters and in combination with the optical curve;

Calculate a segmented correction curve based on the at least two current segmentation points and the at least two compensation current values;

Determine at least two sets of compensation parameters corresponding to the at least two current segmented intervals in the segmented correction curve, and save the at least two sets of compensation parameters for each pixel point in the display device according to the required The at least two sets of compensation parameters are used to determine corresponding compensation currents for brightness and chromaticity compensation;

Each set of compensation parameters includes: compensation gain parameters and compensation offset parameters determined according to the segmented correction curve.

A second aspect of the present disclosure provides a display device, including:

The display module is configured to: display according to the display data;

A memory configured to: receive at least two sets of compensation parameters obtained using the method described in the first aspect, and save the at least two sets of compensation parameters;

A control unit, electrically coupled to the display module and the memory, and configured to: obtain the current display data of the display module, and retrieve corresponding compensation parameters from the memory according to the current display data. , calculate the compensation current according to the compensation parameters, and control the display module to compensate the display data according to the compensation current.

A third aspect of the present disclosure provides a computer device, including one or more processors, a memory; and one or more programs, wherein the one or more programs are stored in the memory, and are Executed by one or more processors, the program includes instructions for performing the method according to the first aspect.

A fourth aspect of the present disclosure provides a non-volatile computer-readable storage medium containing a computer program. When the computer program is executed by one or more processors, the processor causes the processor to execute the first aspect. Methods.

A fifth aspect of the present disclosure provides a computer program product, which includes computer program instructions. When the computer program instructions are run on a computer, they cause the computer to execute the method described in the first aspect.

It can be seen from the above that the method and related equipment for compensating the brightness and chromaticity of a display device provided by the present disclosure can divide the obtained segmented correction curve into at least two current segmented intervals, and then obtain at least two sets of current segmented intervals. The compensation parameter consists of the compensation gain parameter and the compensation offset parameter, so that the corresponding compensation gain parameter and compensation offset parameter can be determined for each pixel point of the display device, and then the corresponding compensation gain parameter and compensation offset parameter can be determined based on the determined compensation gain parameter and compensation offset parameter. The compensation current is used to compensate the brightness and chromaticity of the pixels of the display device according to the compensation current. This solution can combine the compensation gain parameter and the compensation offset parameter to determine a more accurate compensation current, ensure the uniformity index of the pixel transition gray scale, and greatly improve the visual effect and performance index of the display device.

Description of 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 will be briefly introduced below. Obviously, the drawings in the following description are only for illustration of the present disclosure. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1A shows a schematic flowchart of an exemplary method provided by an embodiment of the present disclosure;

1B shows a specific flow diagram of the steps of calculating optical curves according to an embodiment of the present disclosure;

1C shows a specific flow diagram of the steps of obtaining target optical parameters according to an embodiment of the present disclosure;

1D shows a specific flow diagram of the steps of determining at least two current segmentation points according to an embodiment of the present disclosure;

Figure 1E shows a schematic diagram of the uniformity change curve obtained from the three initially determined current segmentation points;

FIG. 1F shows a specific flow diagram of the steps of determining a piecewise correction curve according to an embodiment of the present disclosure;

1G shows a specific flow diagram of the steps of determining and saving compensation parameters according to an embodiment of the present disclosure;

Figure 1H shows a schematic diagram of the segmented correction curve corresponding to the three current intervals (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ];

Figure 2A shows a comparison diagram of the relationship between the input current and the stimulation value

Figure 2B shows a schematic flow chart for determining three corresponding sets of compensation parameters for an active-driving miniature inorganic light-emitting diode display;

3A shows a schematic diagram of an exemplary display device according to an embodiment of the present disclosure;

Figure 3B shows a schematic diagram of the correction error under different bit number ratios under 16bit;

FIG. 4 shows a schematic diagram of the hardware structure of an exemplary computer device provided by an embodiment of the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of this disclosure should have the usual meanings understood by those with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprising" mean that the elements or things appearing before the word include the elements or things listed after the word and their equivalents, without excluding other elements or things. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

In order to improve the uniformity of the brightness and chromaticity of the display device, embodiments of the present disclosure provide a method of compensating the brightness and chromaticity of the display device.

FIG. 1A shows a schematic flowchart of an exemplary method 100 provided by an embodiment of the present disclosure. The method 100 may be used to compensate for brightness and chromaticity of a display device. In some embodiments, the display device may be an actively driven micro-inorganic light-emitting diode display. The display device may include multiple pixels and multiple drive circuits. The pixels are micro-inorganic light-emitting diodes. Each drive circuit It is used to provide a driving signal to at least one pixel, and the driving circuit can be implemented by a combination of micro integrated circuit chips or thin film transistors.

During the production process of micro-inorganic light-emitting diode displays, there are process fluctuations in epitaxial thickness and uneven materials, resulting in differences in the optoelectronic parameters of micro-inorganic light-emitting diodes produced in different batches. When micro-inorganic light-emitting diodes are installed on a single substrate, the formation of When using a single display module and then splicing multiple single display modules into a large-size display screen to play the picture, uneven phenomena such as mottled, mosaic, and blurred screens will appear.

Based on this situation, the exemplary method 100 provided in this embodiment, as shown in FIG. 1A , may include the following steps.

The display device may be composed of a single display module or may be composed of multiple display modules. The present disclosure preferably performs brightness and chromaticity compensation processing on a display device composed of multiple display modules.

Generally, every time a light-emitting diode manufacturer produces a batch of light-emitting diodes, it needs to classify the light-emitting diodes according to the optical parameters of each light-emitting diode. Specifically, the light-emitting diodes can be classified according to their optical parameters, and the light-emitting diodes whose optical parameters are within the same set range are grouped into a bin. Among them, the optical parameters used when dividing bins may include chromaticity, brightness, voltage, etc. Ensure that the micro-inorganic light-emitting diodes on each display module in the display device belong to the same bin to ensure the display performance of the display module.

Therefore, the same specifications of the tested display devices in the following process (micro inorganic light-emitting diode displays, micro micro inorganic light-emitting diode displays or micro inorganic light-emitting diodes (or micro inorganic light-emitting diodes, micro micro inorganic light-emitting diodes) are used as backlight sources Displays) can use the method 100 to compensate the display device.

In step 101, the optical curve of the display device is determined.

For the sake of calculation convenience, the discrete relationship data between optical parameters and current values is not stored in the computer equipment. Therefore, in this embodiment, the relationship between optical parameters and current values is processed into an optical curve.

In this embodiment, for the convenience of calculation, the CIE1931 standard colorimetric observer spectral tristimulus value is selected as the optical parameter. For example, select the spectral stimulus value X.

When measuring the optical curve, you can use a collection device (for example, CA410 device) to measure the brightness-current curve of each display module that makes up the display device, and sum the brightness-current curves of all display modules of the display device. Average the optical curves.

However, it is time-consuming and labor-intensive to measure all of each display module, so the preferred way is to select multiple display modules in predetermined areas from the display device to measure the brightness-current curve using an acquisition device (for example, CA410 device), and The brightness-current curves of multiple display modules in a predetermined area are summed and averaged to obtain an optical curve.

In step 101, the optical curves corresponding to the three colors of the display area (that is, the three colors of red, green, and blue RGB) can be calculated respectively.

FIG. 1B shows a specific flow diagram of step 101 of calculating optical curves according to an embodiment of the present disclosure. As shown in Figure 1B, in some embodiments, step 101 may further include the following steps.

Step 1011: Determine the target color among the three primary colors. For example, select blue as the target color from red, green, and blue. Subsequently, other colors of the three primary colors (the other two colors except the target color) are processed according to the following steps 1012 and 1013, and then three optical curves corresponding to the three colors are obtained.

Step 1012: Obtain current values corresponding to multiple optical parameters corresponding to the target color of the display device, and formulate a relationship curve between the optical parameters and current values of the target color. The optical parameters include: chromaticity, brightness, voltage, etc. In this embodiment, brightness is preferably the optical parameter.

According to the preset gray-scale bit number b, the current of the display device is divided into 2 ^b current levels. Measure the target color corresponding to each of the 2 ^b current gears (for example, 2 ^b brightness values of red/green/blue) respectively. During the measurement process, the display is composed of multiple display modules. device, select the central area of each display module within a predetermined area in the display device for measurement. The central area is a circular area equidistant from the four edges of the display module. The probe size of the brightness measurement equipment is consistent with the circular area. The areas are congruent graphics, making it easy to collect the brightness of the corresponding areas.

The relationship curve between the brightness and current value of the target color is formulated based on the measured 2 ^b current values of the target color.

Generally, in order to ensure the display quality of the display device, micro inorganic light-emitting diodes need to be divided according to specification parameters (wavelength/brightness/voltage (same current)), which is called BIN. The BINs are divided into different ranges to ensure that the micro-inorganic light-emitting diodes on each display module in the display device belong to the same bin to ensure the display performance of the display module.

Step 1013: Fit the relationship curve between the optical parameters and the current value of the target color, and perform inverse function processing on the fitted relationship curve between the optical parameters and the current value of the target color to obtain the optical curve of the target color. For example, the obtained relationship curve formula between the optical parameter (for example, the brightness value L) and the current value I is L=f(I), and the inverse function processing obtains I'=f'(L).

Fitting the relationship curve between optical parameters and current values can facilitate subsequent calculations. The form of the fitting curve includes straight line fitting and exponential curve fitting but is not limited to these two forms. The fitting method uses the least squares method for fitting. The formula obtained after fitting is L=f(I), that is, the L-I curve (brightness-current curve). Theoretically, it is best to collect the corresponding relationship between the brightness and current of all display modules of the display device and perform fitting. However, this requires a long calculation time, so the brightness of the display modules in a predetermined area of the display device can be collected. -The current curves are added and averaged to obtain f(I), and the f(I) of the predetermined area is regarded as the f(I) of the display device.

In order to facilitate subsequent processing, it is necessary to perform inverse function processing on the relationship curve between optical parameters and current values, and obtain I'=f'(L), where I' refers to the corresponding compensated current gear, and f'(L) is L= The inverse function of f(I).

In step 102, at least two target optical parameters of the display device are obtained. The target optical parameter is selected as the average brightness value of the display device.

FIG. 1C shows a specific flow diagram of step 102 of obtaining target optical parameters according to an embodiment of the present disclosure. As shown in Figure 1C, in some embodiments, step 102 may further include the following steps.

Step 1021: Determine at least two initial gray levels. Among them, the selected number of initial gray levels is selected according to the corresponding current segmentation requirements, and two segments, three segments, four segments, etc. can be selected. For example, if the number of current segments is 3, three gray levels of 90, 160, and 224 can be selected as the initial gray levels.

Step 1022: Determine at least two initial current segmentation points corresponding to the at least two initial gray levels according to the gray level and current correspondence table (ie, gamma table).

For example, for the selected three gray levels of 90, 160, and 224, the corresponding current values are determined according to the gamma table as the three initial current segmentation points ( _{IInitial 1} , _{IInitial 2} , _{IInitial 3} ).

Step 1023, use a full-screen point-by-point brightness collection device to collect the average brightness value corresponding to each initial current segmentation point of the display device at the at least two initial current segmentation points, and obtain at least two average brightness values. The at least two average brightness values serve as the at least two target optical parameters.

A full-screen point-by-point brightness acquisition device is used to collect the brightness value of each pixel in the display device at each initial current segmentation point. In this way, each initial current segmentation point corresponds to a set of brightness values, and the corresponding brightness average value is calculated for each set of brightness values. For example, three initial current segmentation points ( _{Istart 1} , Istart ₂ , and _{Istart 3} ) correspond to three sets of brightness average values. In this way, subsequent compensation based on the average brightness value can reduce brightness loss.

In step 103, at least two current segmentation points are determined based on the target optical parameters, and at least two current segmentation intervals are determined based on the at least two current segmentation points.

The corresponding at least two current segmentation points may be three, four, ten, etc. N current segmentation points, N≥2. In this embodiment, it 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 Figure 1D, in some embodiments, step 103 may further include the following steps.

Step 1031: Determine at least two uniformity change curves respectively corresponding to the at least two initial current segment points.

Specifically, using the uniformity calculation formula Calculate the uniformity value under each gray scale (0-255 gray scale), where L _i is the brightness value corresponding to different gray scales, and the average brightness average is. Use an optical measuring instrument (for example, CA410) to measure each initial current The brightness values corresponding to multiple (for example, 9) points on each display module in the display device corresponding to the segmentation points are obtained by averaging them. The uniformity data corresponding to each display module in the display device are summed and averaged to obtain the final uniformity value. In this way, each initial current segmentation point corresponds to a set of uniformity values at each gray level (0-255 gray level). Based on these uniformity values, the uniformity change curve corresponding to each initial current segmentation point is drawn.

For example, if there are three initial current segmentation points assigned above ( _{IInitial 1} , _{IInitial 2} , and _{IInitial 3} ), three corresponding uniformity change curves will be obtained.

Step 1032: Use at least two intersection points of the at least two uniformity change curves as the at least two current segment points.

Specifically, since active driving micro-inorganic light-emitting diodes adopt AM driving mode, the corresponding L-I curve is non-linear, which will result in a certain set of initial current segmentation points only ensuring uniformity within a certain gray scale range. , and when the gray scale is far away from this range, the uniformity will drop sharply, so there must be an intersection point between at least two uniformity change curves. Determine the current value corresponding to the intersection point, and use this current value as the current segmentation point.

For example, FIG. 1E shows a schematic diagram of the uniformity change curve obtained from the initially determined three current segmentation points. As shown in Figure 1E, there are three initial current segmentation points ( _{IInitial 1} , _{IInitial 2} , and _{IInitial 3} ), corresponding to which three uniformity change curves are obtained. The three uniformity change curves have three intersection points in the coordinate system. The current values (I ₁ , I ₂ , I ₃ ) corresponding to these three intersection points are used as current segmentation points. This will correspond to three current intervals (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ].

Step 104: Determine at least two compensation current values based on the at least two target optical parameters and in combination with the optical curve.

Specifically, based on the obtained at least two target optical parameters (for example, the average full-screen pixel brightness L _target of a display device spliced by multiple display modules), the above-mentioned calculation is performed based on the inverse function I′=f′(L _target ). At least two compensation current values corresponding to at least two target optical parameters.

For example, input the three sets of brightness average values obtained in step 1023 to I'=f'(L _target ) to obtain three compensation current values (I' ₁ , I' ₂ , I' ₃ ), that is to say, I ₁ corresponds to the corrected value I' ₁ , I ₂ corresponds to the corrected value I' ₂ , and I ₃ corresponds to the corrected value I' ₃ .

Step 105: Calculate a segmented correction curve based on the at least two current segmentation points and the at least two compensation current values. The obtained segmented correction curve has at least two segmented intervals, and the number of segmented intervals is equal to the number of current segmented points.

FIG. 1F shows a specific flow diagram of step 105 of determining a segmented correction curve according to an embodiment of the present disclosure. As shown in FIG. 1F, in some embodiments, step 105 may further include the following steps.

Step 1051: Obtain at least two current segmentation intervals based on the at least two current segmentation points. For example, three current segmentation points (I ₁ , I ₂ , I ₃ ) will correspond to three current intervals (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ].

Step 1052: Determine correction curves corresponding to the at least two current segment intervals based on the optical curve to obtain at least two correction curves.

According to the formula correction coefficient=compensated current value I'/original current value I, the correction curve corresponding to each current segment interval is calculated. For example, the compensated current value I' is the corresponding (I' ₁ , I' ₂ , I' ₃ ) obtained according to the above steps, and the original current value I is (I ₁ , I ₂ , I ₃ ) obtained according to the above steps. , corresponding to three sets of correction coefficients, and based on these three correction coefficients, three correction curves corresponding to (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ] are obtained.

Because under the AM driving mode, when the current is far away from the corresponding current segmentation interval, the correction effect will drop sharply. For details, please refer to the figure. The current range between the two current segmentation points is the transition current area (mapped to the gamma table is the transitional gray scale area), so simply relying on the correction coefficient for correction will lead to insufficient uniformity.

Based on the above situation, the following solution of step 1053 is adopted.

Step 1053: Combine the at least two current segmentation points and the at least two compensation current values to fit the at least two correction curves to determine a segmentation correction curve.

Among them, the obtained segmented calibration curve corresponds to multiple segmented intervals. The formula corresponding to the obtained segmented correction curve is I’=Amp*I+bias, I’ is the compensated current value, I is the current current value, Amp is the compensation gain parameter, and bias is the compensation offset parameter.

For example, for the three current intervals (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ] obtained above, the first section fitting formula is The second fitting formula is/> The fitting formula of the third section is

Step 106: Determine at least two sets of compensation parameters corresponding to the at least two current segment intervals in the segment correction curve, and save the at least two sets of compensation parameters for each pixel in the display device. The corresponding compensation current is determined according to the at least two sets of compensation parameters to perform brightness and chromaticity compensation.

Each set of compensation parameters includes: compensation gain parameters and compensation offset parameters determined according to the segmented correction curve.

During specific implementation, since the segmented correction curves are different in each current segmented interval, multiple segments of compensation curves will be obtained correspondingly, and the segmented correction curves in each current segmented interval belong to straight lines. The formulas corresponding to each straight line can be the same or different, so each current segment interval will correspond to a set of compensation gain parameters and compensation offset parameters, so that each set of compensation gain parameters and compensation offset parameters can be saved as compensation parameters. .

FIG. 1G shows a specific flow diagram of step 106 of determining and saving compensation parameters according to an embodiment of the present disclosure. As shown in Figure 1G, in some embodiments, step 106 may further include the following steps.

Step 1061, determine the formula of the obtained piecewise calibration curve to be I’=Amp*I+bias.

Step 1062: Obtain at least two sets of Amp and bias in the formula of the segmented correction curve according to the at least two current segmented intervals.

For example, Figure 1H shows a schematic diagram of the segmented calibration curve corresponding to the three current intervals (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ]. As can be seen from Figure 1H, we can get Corresponding three sets of compensation parameters (Amp ₀₁ , Bias ₀₁ ), (Amp ₁₂ , Bias ₁₂ ), (Amp ₂₃ , Bias ₂₃ ).

Step 1063: Save at least two sets of Amp and bias as the at least two sets of compensation parameters.

In some embodiments, the at least two sets of compensation parameters can be saved in a hardware storage manner. At least two sets of compensation parameters are stored in hardware storage (for example, memory), so that there is no need to store the calculation formula of the entire segmented calibration curve, and storage space can be saved.

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 group of compensation gain The compensation parameter consists of parameter and compensation offset parameter.

According to the above, the at least two sets of compensation parameters are compensation parameters corresponding to different current segments. When the input current of the display device is in a certain segment, the compensation parameters corresponding to the segment are selected for compensation.

Figure 2A shows a comparison diagram of the relationship between the input current and the stimulation value As can be seen from Figure 2A, the relationship between the PM (passive matrix) micro-inorganic light-emitting diode display and the stimulus value X is linear. The active-driven micro-inorganic light-emitting diode display has the characteristics of high refresh rate, low flicker, healthy eye protection, and low power consumption. It is the future development trend of micro-inorganic light-emitting diode display. Since micro-inorganic light-emitting diodes are current-driven components, and the brightness response curve of micro-inorganic light-emitting diodes under different currents is nonlinear, conventional correction cannot satisfy the more complex display characteristics of active-driven micro-inorganic light-emitting diodes.

Therefore, the linear compensation method cannot well compensate for the active driving mode of micro-inorganic light-emitting diode displays, while the segmented correction curve of the present disclosure can better reflect the active driving mode of micro-inorganic light-emitting diode displays. screen compensation. It can be understood that the stimulus value X (or stimulus value Y, Z) has a corresponding conversion relationship with brightness and chromaticity. Therefore, the characteristics of the optical curve reflected on the stimulus value Relationship curve with current value.

FIG. 2B shows a schematic flowchart of determining three corresponding sets of compensation parameters for an active-driving miniature inorganic light-emitting diode display. As shown in Figure 2B:

Step 201: Measure the characteristic curve L-I (ie, optical curve) of the miniature inorganic light-emitting diode.

Step 202: Fit the characteristic curve of the micro inorganic light-emitting diode (the fitting parameters only participate in the software calculation).

Step 203: Perform pixel-by-pixel brightness collection on the determined initial current segment points _Istart1 , _Istart2 , and _Istart3 .

Step 204: Select the target value, that is, measure the average brightness (corresponding to three average brightnesses).

Step 205: Measure the uniformity change curve corresponding to _Istart1 , _Istart2 , and _Istart3 of the display device (as shown in Figure 1E).

Step 206: Determine the corresponding current segmentation points I ₁ , I ₂ , and I ₃ according to the intersection points corresponding to each uniformity change curve to obtain three segmentation intervals (0, I ₁ ], (I ₁ , I ₂ ], (I ₂ , I ₃ ].

Step 207: Calculate the compensated currents I' ₁ , I' ₂ , and I' ₃ corresponding to the three average brightnesses through the compensation formula I'=f'(L _target ).

Step 208: Determine the correction curves corresponding to the three current segment intervals;

Step 209: Linearly fit the three calibration curves based on the current segmentation points I ₁ , I ₂ , I ₃ and the compensated currents I' ₁ , I' ₂ , I' ₃ to obtain the fitted segmentation correction. Curve (shown in Figure 1H).

Step 210: According to the segmented correction curve, the final compensation parameters (Amp ₀₁ , Bias ₀₁ ), (Amp ₁₂ , Bias ₁₂ ), (Amp ₂₃ , Bias ₂₃ ) are obtained.

Step 211: Store three sets of compensation parameters into hardware flash memory.

In this way, if you need to compensate a pixel later, you only need to measure the current of the pixel, determine the segmented interval according to the current, retrieve the corresponding compensation parameters from the flash memory according to the segmented interval, and calculate the compensation of the pixel. Current, the pixel is compensated according to the compensation current. The compensation parameters are stored using hardware storage.

The method for compensating the brightness and chromaticity of a display device provided by embodiments of the present disclosure compensates the display device through at least two sets of obtained compensation parameters, and can obtain a better compensation effect. Furthermore, 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 the AM driving mode, the method provided by the embodiment of the present disclosure is to compensate for the brightness and chromaticity of the display device. , the obtained segmented correction curve can be divided into at least two current segmented intervals, and then at least two sets of compensation parameters composed of compensation gain parameters and compensation offset parameters can be obtained, so that the corresponding pixel points of the display device can be determined The compensation gain parameters and compensation offset parameters are determined, and then the corresponding compensation current is determined based on the determined compensation gain parameters and compensation offset parameters, and the brightness and chromaticity compensation is performed on the pixel points of the display device based on the compensation current. This solution can combine the compensation gain parameter and the compensation offset parameter to determine a more accurate compensation current, ensure the uniformity index of the pixel transition gray scale, and greatly improve the visual effect and performance index of the display device.

It can be understood that the method for compensating the brightness and chromaticity of a display device provided by the embodiments of the present disclosure can be used to compensate for an active light-emitting display device (for example, an OLED display, a micro inorganic light-emitting diode tube display, etc.), or it can also To compensate the backlight of a passive light-emitting display device (for example, a liquid crystal display), various display devices can choose to use the methods provided by embodiments of the present disclosure to compensate for brightness and chromaticity according to actual needs.

In the embodiment of the present disclosure, the three primary colors of RGB are used as examples for explanation. It can be understood that other colors can also be selected for parameter calculation, such as yellow, cyan, magenta, etc.

It should be noted that the methods in the embodiments of the present disclosure can be executed by a single device, such as a computer or server. The method of this embodiment can also be applied in a distributed scenario, and is completed by multiple devices cooperating with each other. In this distributed scenario, one device among the multiple devices can only perform one or more steps in the method of the embodiment of the present disclosure, and the multiple devices will interact with each other to complete all the steps. method described.

It should be noted that some embodiments of the present disclosure have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the above-described embodiments and still achieve the desired results. Additionally, the processes depicted in the figures do not necessarily require the specific order shown, or sequential order, to achieve desirable results. Multitasking and parallel processing are also possible or may be advantageous in certain implementations.

Embodiments of the present disclosure also provide a display device with good full-grayscale brightness and chromaticity uniformity.

FIG. 3A shows a schematic diagram of an exemplary display device 300 according to an embodiment of the present disclosure.

As shown in FIG. 3A , the display device 300 may include a display module 301, a memory 302, and a control unit. The display module 301 and the memory 302 are both electrically coupled to the control unit. The display module 301 can display according to the display data provided by the control unit; the memory 302 is configured to: receive at least two sets of compensation parameters obtained by the method 100, and save the at least two sets of compensation parameters; the control unit obtains the The display module 301 retrieves the current display data from the memory 302 according to the current display data, calculates the compensation current according to the compensation parameters, and controls the display module 301 to control the display module 301 according to the compensation current. Display data for compensation.

The active-driven micro-inorganic light-emitting diode display has the characteristics of high refresh rate, low flicker, healthy eye protection, and low power consumption. It is the future development trend of micro-inorganic light-emitting diode display. Since micro-inorganic light-emitting diodes are current-driven components, and the brightness response curve of micro-inorganic light-emitting diodes under different currents is nonlinear, conventional correction cannot satisfy the more complex display characteristics of active-driven micro-inorganic light-emitting diodes. Therefore, in some embodiments, the display device 300 may be an actively driven micro-inorganic light-emitting diode display screen, and the pixels of the display device 300 are micro-inorganic light-emitting diodes.

In this way, at least two sets of compensation parameters are calculated according to the response characteristics of micro-inorganic light-emitting diodes in the AM driving mode according to the embodiment of the present disclosure, and the memory 302 is used to save at least two sets of compensation parameters. This hardware storage method is simple and convenient. When the micro inorganic light-emitting diode needs to perform brightness and chromaticity compensation, the controller 303 only needs to retrieve the corresponding compensation parameters from the memory 302 and use the multiplier and the adder to perform simple calculations to obtain the corresponding compensation current, and then control the active driving mode of the micro-LED. The display data of the inorganic light-emitting diode display is compensated, the operation is convenient and quick, and a good compensation effect can be obtained.

In some embodiments, when performing compensation, the control unit is specifically configured to:

Determine the current value corresponding to the target pixel point in the display module 301 and the display gray level of the target pixel point; determine the target segment interval of the current value in at least two current segment intervals, and obtain the target Target compensation parameters in segmented intervals, the target compensation parameters include: target compensation gain parameters and target compensation offset parameters; calculate the compensation current of the target pixel point according to the target compensation gain parameters and the target compensation offset parameters. , controlling the display module 301 to compensate the target pixel according to the compensation current.

Specifically: obtain the output current value I corresponding to the target pixel point, determine the target current segment interval where the current value I is located, and retrieve the target compensation parameter (target compensation gain parameter) of the target current segment interval from the memory 302 and target compensation offset parameters). The current value obtained by using "I* target compensation gain parameter + target compensation offset parameter" is used as the compensation current. According to the compensation current, the target pixel is current compensated, so that the brightness and chromaticity of the target pixel are consistent with those of the surrounding pixels. adapt. Effectively improve the uniformity of brightness and chroma of transitional grayscales.

The target pixel point i can be any pixel point of the display device 300, and the aforementioned method is used for compensation for each pixel point of the display device 300.

For example, the compensation parameters are divided into three groups: the first group is the compensation parameters (Amp ₀₁ , Bias ₀₁ ) corresponding to the current interval (0, I ₁ ], and the second group is the compensation parameters corresponding to the current interval (I ₁ , I ₂ ] Parameters (Amp ₁₂ , Bias ₁₂ ), the third group is the compensation parameters (Amp ₂₃ , Bias ₂₃ ) corresponding to the current interval (I ₂ , I ₃ ], assuming that the input current of a certain pixel is I, and I ₁ <I ₂ , then you need to select (Amp ₁₂ , Bias ₁₂ ) at this time, and then calculate the corresponding compensation current I'=Amp ₁₂ *I+Bias ₁₂ , and perform pixel-level brightness and chromaticity compensation based on the obtained I'.

In some embodiments, on the premise of ensuring compensation accuracy, the memory is configured to: use a first storage bit width to save the compensation gain parameter, and use a second storage bit width to save the compensation offset parameter. . Among them, the first storage bit width and the second storage bit width can be adjusted according to actual needs. The specific values are not specifically limited here. Specifically, the compensation gain parameter and the compensation offset can be determined through the ratio of the compensation gain parameter and the compensation offset parameter. The storage bit width corresponding to the shift parameter.

Figure 3B shows a schematic diagram of the correction error under different bit number ratios under 16 bit.

As shown in Figure 3B, the compensation parameters are stored using hardware storage. The ordinate is the correction error corresponding to the hardware storage (i.e., the deviation between the actual corrected data (brightness and chromaticity) and the theoretically corrected data), because Hardware storage can only store data with a precision similar to 8/16/32bit, while the precision calculated by the software can be arbitrarily high, so there must be correction errors when the hardware stores correction parameters. The abscissa is the number of bits occupied by the compensation gain parameter in the correction coefficient. Different curves in Figure 3B represent different number of bits occupied by the compensation offset (for example, 1bit/2bit/3bit/4bit/5bit). The curves in Figure 3B correspond to the number of bits one by one. It can be seen from Figure 3B that the compensation gain parameter is an inflection point when it is 11 bits. It is meaningless to select a value after 11 bits for the compensation gain parameter. Therefore, the total bit width occupied by the compensation gain parameter and the compensation offset parameter is 16 bits. The compensation gain parameter and The ratio of compensation offset parameters is 11:5, then the first storage bit width in the above process is 11 bits, and the second storage bit width is 5 bits.

It is easier to store each set of compensation parameters in hardware storage. Since the corresponding segmented correction curve is composed of the compensation straight lines corresponding to each current interval, when you need to compensate the pixel points, you only need to retrieve the corresponding set of compensation from the memory. parameters, and then use the multiplier and adder to obtain the corresponding compensation current. The operation is simple and fast, so that the brightness and chromaticity compensation of the pixels of the display device can be performed based on the compensation current.

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, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The processing The method 100 described in any of the above embodiments is implemented when the computer executes the program.

FIG. 4 shows a schematic hardware structure diagram of an exemplary computer device 400 provided by an embodiment of the present disclosure. The device 400 may include a processor 402, a memory 404, an input/output interface 406, a communication interface 408, and a bus 410. The processor 402, the memory 404, the input/output interface 406 and the communication interface 408 realize communication connections between each other within the device through the bus 410.

The processor 402 can be implemented using a general-purpose CPU (Central Processing Unit, central processing unit), a microprocessor, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits, and is used to execute related tasks. program to implement the technical solutions provided by the embodiments of this specification.

The memory 404 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 404 can store operating systems and other application programs. When the technical solutions provided by the embodiments of this specification are implemented through software or firmware, the relevant program codes are stored in the memory 404 and called and executed by the processor 402 .

The input/output interface 406 is used to connect the input/output module to realize information input and output. The input/output/module can be configured in the device as a component (not shown in the figure), or can be externally connected to the device to provide corresponding functions. Input devices can include keyboards, mice, touch screens, microphones, various sensors, etc., and output devices can include monitors, speakers, vibrators, indicator lights, etc.

The communication interface 408 is used to connect a communication module (not shown in the figure) to realize communication interaction between this device and other devices. The communication module can realize communication through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

Bus 410 includes a path that carries information between various components of the device, such as processor 402, memory 404, input/output interface 406, and communications interface 408.

It should be noted that although the above-mentioned device 400 only shows the processor 402, the memory 404, the input/output interface 406, the communication interface 408 and the bus 410, during specific implementation, the device 400 may also include all necessary components to achieve normal operation. Required additional components. In addition, those skilled in the art can understand that the above-mentioned device 400 may only include components necessary to implement the embodiments of this specification, and does not necessarily include all components shown in the figures.

The computer device 400 of the above embodiments is used to implement the corresponding method 100 in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be described again here.

Based on the same inventive concept, corresponding to any of the above embodiment methods, the present disclosure also provides a non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions use To enable the computer to execute the method 100 as described in any of the above embodiments.

The computer-readable media in this embodiment include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information may be computer-readable instructions, data structures, modules of programs, 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), and 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 disc (DVD) or other optical storage, Magnetic tape cassettes, tape magnetic disk storage or other magnetic storage devices or any other non-transmission medium can be used to store information that can be accessed by a computing device.

The computer instructions stored in the storage media of the above embodiments are used to cause the computer to execute the method 100 as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be described again here.

Based on the same inventive concept, corresponding to the method 100 of any of the above embodiments, the present disclosure also provides a computer program product, which includes a computer program. In some embodiments, the computer program is executable by one or more processors such that the processors perform the method 100 . Corresponding to the execution subject corresponding to each step in each embodiment of the method 100, the processor that executes the corresponding step may belong to the corresponding execution subject.

The computer program product of the above embodiments is used to cause the processor to execute the method 100 as described in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be described again here.

Those of ordinary skill in the art should understand that the discussion of any above embodiments is only illustrative, and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the spirit of the present disclosure, the above embodiments or Technical features in different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of the disclosed embodiments as described above, which are not provided in detail for the sake of brevity.

Additionally, to simplify illustration and discussion, and so as not to obscure embodiments of the present disclosure, well-known power supplies/components with integrated circuit (IC) chips and other components may or may not be shown in the provided figures. Ground connection. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present disclosure, and this also takes into account the fact that details regarding the implementation of these block diagram devices are highly dependent on the implementation of the disclosed embodiments. platform (i.e., these details should be well within the understanding of those skilled in the art). Where specific details (eg, circuits) are set forth to describe exemplary embodiments of the present disclosure, it will be apparent to those skilled in the art that systems may be constructed without these specific details or with changes in these specific details. The embodiments of the present disclosure are implemented below. Accordingly, these descriptions should be considered illustrative rather than restrictive.

Although the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art from 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 variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure shall be included in the protection scope of the present disclosure.

Claims (13)

1. A method for compensating the brightness and chromaticity of a display device, the display device comprising a plurality of pixels, the method comprising: Determining the optical curve of the display device; Obtaining at least two target optical parameters of the display device; Determine at least two current segmentation points, and determine at least two current segmentation intervals based on the at least two current segmentation points; Determine at least two compensation current values based on the at least two target optical parameters and in combination with the optical curve; Calculate a segmented correction curve based on the at least two current segmentation points and the at least two compensation current values; Determine at least two sets of compensation parameters corresponding to the at least two current segmented intervals in the segmented correction curve, and save the at least two sets of compensation parameters for each pixel point in the display device according to the required The at least two sets of compensation parameters are used to determine corresponding compensation currents for brightness and chromaticity compensation; Wherein, each set of compensation parameters includes: compensation gain parameters and compensation offset parameters determined according to the segmented correction curve; Determining at least two sets of compensation parameters corresponding to the at least two current segment intervals in the segment correction curve, and saving the at least two sets of compensation parameters, including: The formula to determine the obtained segmented correction curve is I’=Amp*I+bias, I’ is the compensated current value, I is the current current value, Amp is the compensation gain parameter, and bias is the compensation offset parameter; According to the at least two current segmented intervals, at least two sets of Amp and bias are obtained in the formula of the segmented correction curve; At least two sets of Amp and bias are saved as the at least two sets of compensation parameters. 2. The method of claim 1, wherein obtaining at least two target optical parameters of the display device includes: Determine at least two initial gray levels; Determine at least two initial current segmentation points corresponding to the at least two initial gray levels according to the gray level and current correspondence table; Use a full-screen point-by-point brightness collection device to collect the average brightness value corresponding to each initial current segmentation point of the display device at the at least two initial current segmentation points to obtain at least two average brightness values, and combine the at least two initial current segmentation points. Two average brightness values serve as the at least two target optical parameters. 3. The method of claim 2, wherein determining at least two current segmentation points includes: Determine at least two uniformity change curves respectively corresponding to the at least two initial current segment points; At least two intersection points of the at least two uniformity change curves are used as the at least two current segment points. 4. The method of claim 1, wherein calculating a segmented correction curve based on the at least two current segmentation points and at least two compensation current values includes: Obtain at least two current segmentation intervals based on the at least two current segmentation points; Determine correction curves respectively corresponding to the at least two current segment intervals based on the optical curve, and obtain at least two correction curves; Combining the at least two current segmentation points and the at least two compensation current values, the at least two correction curves are fitted to determine a segmentation correction curve. 5. The method according to claim 1, wherein the at least two sets of compensation parameters can be saved in a hardware storage manner. 6. The method according to any one of claims 1 to 5, wherein the number of the at least two current segmentation points is n, the number of segments of the segmentation correction curve is n, and the segmentation correction Each segment of the curve corresponds to a set of compensation parameters consisting of compensation gain parameters and compensation offset parameters. 7. The method of claim 1, wherein determining an optical curve of the display device includes: Determine the target color among the three primary colors; Obtain current values corresponding to multiple optical parameters corresponding to the target color of the display device, and formulate a relationship curve between the optical parameters and current values of the target color; The relationship curve between the optical parameters and the current value of the target color is fitted, and the fitted relationship curve between the optical parameters and the current value of the target color is processed by an inverse function to obtain the optical curve of the target color. 8. A display device, comprising: The display module is configured to: display according to the display data; A memory configured to: receive at least two sets of compensation parameters obtained using the method described in any one of claims 1 to 7, and save the at least two sets of compensation parameters; A control unit, electrically coupled to the display module and the memory, and configured to: obtain the current display data of the display module, and retrieve corresponding compensation parameters from the memory according to the current display data. , calculate the compensation current according to the compensation parameters, and control the display module to compensate the display data according to the compensation current. 9. The display device according to 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 of claim 8, wherein the control unit is configured to: Determine the current value corresponding to the target pixel in the display module and the display grayscale of the target pixel; Determine the target segment interval in which the current value is in at least two current segment intervals, and obtain the target compensation parameters of the target segment interval, where the target compensation parameters include: a target compensation gain parameter and a target compensation offset parameter; Calculate the compensation current of the target pixel according to the target compensation gain parameter and the target compensation offset parameter, and control the display module to compensate the target pixel according to the compensation current. 11. The display device according to claim 8, wherein the memory is configured to: The first storage bit width is used to save the compensation gain parameter, and the second storage bit width is used to save the compensation offset parameter. 12. A computer device, comprising one or more processors, a memory; and one or more programs, wherein the one or more programs are stored in the memory and used by the one or more processors To execute, the program includes instructions for executing the method according to any one of claims 1 to 7. 13. A non-volatile computer-readable storage medium containing a computer program that, when executed by one or more processors, causes the processor to execute any one of claims 1 to 7 Methods.