CN108376532B - Brightness compensation method and device for display device - Google Patents

Abstract

The embodiment of the invention provides a brightness compensation method and a device of a display device, relates to the technical field of display, and can solve the problem that the brightness of a sub-pixel can only be adjusted by compensating a threshold voltage in the prior art; the display device comprises a plurality of sub-pixels, and the brightness compensation method of the display device comprises the following steps: acquiring an actual brightness value of each sub-pixel when a plurality of set display data are respectively input, wherein the plurality of set display data are partial values in a value range of the display data of the sub-pixel; and acquiring a compensation mapping relation of the sub-pixels according to the actual brightness value of the sub-pixels when each set display data is input and the target brightness value of the sub-pixels when the set display data is input, wherein the compensation mapping relation is the corresponding relation between each first display data and second display data in the value range of the display data of the sub-pixels, the second display data is obtained after the first display data is compensated, and the second display data is positioned in the value range of the display data of the sub-pixels.

Description

Brightness compensation method and device for display device

technical field

The present invention relates to the field of display technology, and in particular, to a brightness compensation method and device for a display device.

Background technique

The uniformity of the display screen of the display device is an important parameter index for evaluating the quality of the display device; especially for the organic light emitting diode (Organic Light Emitting Diode, OLED) display device, due to process, material and design reasons, it often occurs. The phenomenon of uneven brightness, resulting in a decrease in the quality of the display screen.

For the phenomenon of uneven brightness of the display screen, in the prior art, for the problem of uneven brightness caused by the drift or change of the threshold voltage, the brightness compensation is performed by compensating the threshold voltage to make the brightness of the display screen uniform. The threshold voltage method cannot compensate for uneven brightness caused by factors other than the threshold voltage, and thus cannot fundamentally solve the problem of uneven brightness in real devices.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a brightness compensation method and device for a display device, which can solve the limitation in the prior art that the brightness of a sub-pixel can only be adjusted by compensating for a threshold voltage.

To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

An aspect of an embodiment of the present invention provides a brightness compensation method for a display device, the display device includes a plurality of sub-pixels, and the brightness compensation method includes: acquiring each of the sub-pixels and inputting a plurality of set display data respectively The actual brightness value at the time of the display data, the plurality of set display data are part of the value range of the display data of the sub-pixel; according to the sub-pixel when each set display data is input The actual brightness value and the target brightness value of the sub-pixel when the set display data is input, and the compensation mapping relationship of the sub-pixel is obtained, and the compensation mapping relationship is each value within the display data value range of the sub-pixel. The corresponding relationship between the first display data and the second display data, the second display data is obtained by compensating the first display data, and the second display data is located in the display data value range of the sub-pixel Inside.

Further, the brightness compensation method further includes: judging whether the actual brightness values of the sub-pixels when multiple set display data are input respectively belong to the corresponding brightness deviation range, if the multiple set display data corresponding to At least one actual brightness value in the plurality of actual brightness values exceeds the corresponding brightness deviation range, then according to the actual brightness value of the sub-pixel when inputting each of the set display data and the sub-pixel when inputting the set display data. The target luminance value when data is displayed, and the compensation mapping relationship of the sub-pixels is obtained.

Further, according to the actual brightness value of the sub-pixel when each of the set display data is input and the target brightness value of the sub-pixel when the set display data is input, obtain the sub-pixel's brightness value. The compensation mapping relationship includes: according to the actual brightness value of the sub-pixel when each of the set display data is input and the target brightness value of the sub-pixel when the set display data is input, obtaining the sub-pixel's brightness value. For a plurality of compensation data, the compensation mapping relationship of the sub-pixel is acquired according to the plurality of compensation data of the sub-pixel.

Further, the acquiring the actual brightness value of each of the sub-pixels when a plurality of set display data are respectively input includes: for each of the set display data, acquiring each of the sub-pixels at multiple times. A plurality of luminance values when the set display data is input, and the average value of the plurality of luminance values is taken as the actual luminance value of the sub-pixel corresponding to the set display data.

Further, the acquiring the actual brightness value of each of the sub-pixels when a plurality of set display data are respectively input includes: acquiring the display data corresponding to each of the sub-pixels when the plurality of gamma reference voltages are respectively input. Actual brightness value.

Further, the plurality of sub-pixels are all sub-pixels in the effective display area of the display device.

Further, the target brightness value of the sub-pixel when the set display data is input: the brightness value corresponding to the set display data on the gamma curve; The target brightness value when the set display data is set: when the sub-pixels of the same color input the set display data, the average value of the actual brightness values corresponding to each of the sub-pixels located within the first brightness value range. The brightness value; wherein, the first brightness value range is: the brightness value range with the highest occurrence frequency among the actual brightness values corresponding to the sub-pixels of the same color; The target brightness value at the time of data is: the average brightness value of the actual brightness values of the sub-pixels of the same color when the set display data is input.

Another aspect of the embodiments of the present invention further provides a brightness compensation device for a display device, the display device includes a plurality of sub-pixels, and the brightness compensation device includes: a brightness acquisition unit: configured to acquire the The actual brightness value when multiple set display data are input, and the multiple set display data are partial values within the value range of the display data of the sub-pixel; the compensation mapping relationship acquisition unit: used for The actual brightness value of the sub-pixel when inputting each of the set display data and the target brightness value of the sub-pixel when the set display data is input, and the compensation mapping relationship of the sub-pixel is obtained, and the compensation The mapping relationship is the corresponding relationship between each first display data and second display data within the value range of the sub-pixel display data, and the second display data is obtained by compensating the first display data, and The second display data is located within the value range of the display data of the sub-pixels.

Further, the luminance compensation device further includes a judgment unit; the judgment unit is used to judge whether the actual luminance value of the sub-pixels when a plurality of set display data are inputted respectively belong to the corresponding luminance deviation range, if the If at least one of the plurality of actual luminance values corresponding to the plurality of set display data exceeds the corresponding luminance deviation range, the compensation mapping relationship of the sub-pixel is obtained through the compensation mapping relationship obtaining unit.

Another aspect of the embodiments of the present invention further provides a display device, the display device includes a plurality of sub-pixels, the display device further includes a timing controller and a data driving circuit; the timing controller is used to connect each of the sub-pixels The first display data of the pixel generates the second display data according to the compensation mapping relationship obtained by the aforementioned luminance compensation method, and outputs the second display data to the data driving circuit.

Embodiments of the present invention provide a brightness compensation method and device for a display device, the display device includes a plurality of sub-pixels, and the brightness compensation method of the display device includes: acquiring each sub-pixel when a plurality of set display data are respectively input The actual brightness value of a plurality of set display data is part of the display data value range of the sub-pixel; according to the actual brightness value of the sub-pixel when inputting each set display data The set target brightness value when displaying data is obtained, and the compensation mapping relationship of the sub-pixel is obtained. The compensation mapping relationship is the corresponding relationship between each first display data and the second display data within the value range of the sub-pixel display data, and the second The display data is obtained by compensating the first display data, and the second display data is within the value range of the display data of the sub-pixel.

To sum up, in the present invention, the actual brightness value of the sub-pixel is directly measured, and the compensation mapping relationship between each first display data and the second display data of the sub-pixel within the display data value range of the sub-pixel is obtained according to the actual brightness value and the target brightness value. , in this way, in the actual display, the second display data after the compensation of the first display data corresponding to each sub-pixel can be obtained according to the obtained compensation mapping relationship can be used for actual display, so that the sub-pixel can be The brightness value of the pixel during display is closer to the target brightness value, that is, compared with the prior art, the brightness of the sub-pixel can only be adjusted by compensating the threshold voltage, resulting in the limitation of adjusting the uniformity of display brightness (for example, Only by compensating the threshold voltage can not solve the problem of uneven display brightness caused by other factors), in the present invention, by directly compensating the brightness of the measured sub-pixels, it can solve the display device brightness caused by arbitrary factors. The problem of uniformity (Mura), that is, the problem of uneven display brightness of the display device can be fundamentally more comprehensively solved.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a flowchart of a brightness compensation method of a display device according to an embodiment of the present invention;

2 is a schematic diagram of a luminance curve and a luminance deviation range curve of a sub-pixel provided by an embodiment of the present invention;

3 is a schematic diagram of a gamma reference curve and an actual brightness value curve provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of another gamma reference curve and an actual luminance value curve provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Compared with the prior art, the brightness compensation of the display device can only be performed by measuring the threshold voltage, the embodiment of the present invention provides a brightness compensation method with wider applicability and more comprehensiveness. The difference between the actual brightness of the sub-pixels and the target brightness is used to compensate the brightness of the sub-pixels.

Of course, it should be understood here that the use of the brightness compensation method in the present invention is for a single sub-pixel in a plurality of sub-pixels in a display device, wherein, for the plurality of sub-pixels in the display device, the The multiple sub-pixels can be all sub-pixels in the effective display area of the display device, or all sub-pixels in a partial area in the effective display area of the display device (for example, the brightness of the partial area may be easily caused by the manufacturing process. , so in practice, only this part of the area can be compensated), which is not specifically limited in the present invention, and in practice, the area that needs to be compensated for brightness can be selected according to needs.

The brightness compensation method in the present invention will be further described below.

Specifically, as shown in Figure 1, the brightness compensation method includes:

Step S101: Acquire the actual luminance value of each sub-pixel when multiple set display data are input respectively, and the multiple set display data are partial values within the display data value range of the sub-pixel.

Specifically, it is generally preferred in practice that the plurality of set display data may be display data corresponding to a plurality of gamma reference voltages; that is, the preferred step S101 is: obtaining each sub-pixel and inputting a plurality of gamma reference voltages respectively. The actual brightness value of the display data corresponding to the gamma reference voltage; for example, the display data corresponding to the multiple gamma reference voltages may be the display data corresponding to 0 grayscale, 63 grayscale, 127 grayscale, and 255 grayscale, respectively, but not Not limited to this; the following embodiments are all examples of display data corresponding to the above-mentioned multiple set display data as 0 grayscale, 63 grayscale, 127 grayscale, and 255 grayscale respectively, to further illustrate the present invention.

Step S102, according to the actual brightness value of the sub-pixel when inputting each set display data and the target brightness value of the sub-pixel when inputting the set display data, obtain the compensation mapping relationship of the sub-pixel, and the compensation mapping relationship It is the corresponding relationship between each first display data and the second display data within the value range of the sub-pixel display data (that is, each first display data corresponds to a second display data one-to-one), and the second display data is a pair of The second display data is obtained by compensating the first display data, and the second display data is within the value range of the display data of the sub-pixel.

It should be noted here that the second display data is obtained by obtaining the first display data according to the compensation mapping relationship. If the obtained second display data exceeds the maximum value of the display data value range, the maximum value is regarded as the maximum value. For the second display data, also if the acquired second display data exceeds the minimum value of the display data value range, the minimum value is regarded as the second display data; that is, for very rare cases, The determination of the second display data is not completely obtained from the first display data through the compensation mapping relationship, and it is necessary to ensure that the second display data is located within the value range of the sub-pixel display data.

On this basis, it should be understood that there will inevitably be a certain difference between the above-mentioned actual brightness value and target brightness value. In practice, according to customer needs, product requirements, etc. The actual brightness value when displaying data can be regarded as qualified within a certain brightness deviation range; for example, as shown in Figure 2, the actual brightness L under a set display data (gray scale) only needs to be between the brightness L' and the brightness. L” can be considered to meet the actual brightness requirements, that is, the brightness value can be regarded as the target brightness value; of course, it should also be understood that the brightness deviation range here may vary according to different products and customer requirements. etc., there will be certain differences, which can be selected according to actual needs, which is not specifically limited in the present invention.

Based on this, after step S101 and before step S102, the brightness compensation method of the present invention may further include:

Determine whether the actual brightness value of the sub-pixel falls within the corresponding brightness deviation range when multiple set display data are input respectively, if at least one of the multiple actual brightness values corresponding to the multiple set display data exceeds the corresponding brightness value (that is to say, the brightness uniformity of the display device is considered to be unqualified at this time), then step S102 is executed, that is, the actual brightness value of the sub-pixel when inputting each set display data and the sub-pixel are executed. The target brightness value of the pixel when the set display data is input, and the step of obtaining the compensation mapping relationship of the sub-pixel, so as to ensure that the first display data input by the sub-pixel is compensated through the compensation mapping relationship during actual display. The second display data, so that the brightness value displayed by the corresponding pixel is the same as or close to the target brightness value.

It should be noted here that for the above-mentioned brightness deviation range, the brightness deviation range of sub-pixels of different colors may have certain differences. , the brightness deviation range corresponding to its color needs to be selected.

To sum up, in the present invention, the actual brightness value of the sub-pixel is directly measured, and the compensation mapping relationship between each first display data and the second display data of the sub-pixel within the display data value range of the sub-pixel is obtained according to the actual brightness value and the target brightness value. , in this way, in the actual display, the second display data after the compensation of the first display data corresponding to each sub-pixel can be obtained according to the obtained compensation mapping relationship can be used for actual display, so that the sub-pixel can be The brightness value of the pixel during display is closer to the target brightness value, that is, compared with the prior art, the brightness of the sub-pixel can only be adjusted by compensating the threshold voltage, resulting in the limitation of adjusting the uniformity of display brightness (for example, Only by compensating the threshold voltage can not solve the problem of uneven display brightness caused by other factors), in the present invention, by directly compensating the brightness of the measured sub-pixels, it can solve the problem of uneven display brightness caused by any factors in the display device. The problem (Mura), that is, the problem of uneven display brightness of the display device can be substantially more comprehensively solved.

On this basis, in order to ensure that the acquired compensation mapping relationship is as accurate as possible, in practice, it is necessary to ensure the accuracy of the actual luminance value of the sub-pixels when each set display data is input. Therefore, the present invention preferably In step S101, obtaining the actual brightness value of each sub-pixel when multiple set display data are respectively input includes: for each set display data, obtaining each sub-pixel after multiple input of the set display data multiple brightness values when the display data is set, and the average value of the multiple brightness values is taken as the actual brightness value of the sub-pixel corresponding to the set display data.

In this way, by using the average value of the obtained brightness values as the actual brightness value, the error of the actual brightness value can be reduced, that is, the accuracy of the actual brightness value can be improved, thereby ensuring the accuracy of the obtained compensation mapping relationship , thereby improving the accuracy of luminance compensation for sub-pixels.

In addition, the following further describes the target luminance value of the sub-pixel when the set display data is input in step S102.

Specifically, the target brightness value may be: the brightness value corresponding to the set display data on the gamma curve.

Of course, the above target brightness value can also be: when all sub-pixels of the same color input the set display data, the actual brightness value corresponding to each sub-pixel is located in the average brightness value within the range of the first brightness value; wherein, the first brightness value The luminance value range is: the luminance value range with the highest frequency among the actual luminance values corresponding to each sub-pixel of the same color.

For example, assuming that all sub-pixels of the same color input a set display data, the actual brightness values corresponding to each sub-pixel are divided into 60, 80, 80, 90, 90, 90, 120 (in practice, the actual brightness value distribution is positive state distribution trend), at this time the actual brightness value is mainly concentrated in the first brightness value range of 80-90, in this case, the average brightness of 80, 80, 90, 90, 90 in the first brightness value range A value of 86 is used as the target luminance value of the color sub-pixel, so that positive compensation is required for sub-pixels whose luminance value is less than 86, and negative compensation is required for sub-pixels whose luminance value exceeds 86; of course, this is only a schematic example.

In addition, the above-mentioned target brightness value may also be an average brightness value of the actual brightness value of each sub-pixel of the same color when the set display data is input.

For example, assuming that when all sub-pixels of the same color input the set display data, the actual brightness values corresponding to each sub-pixel are divided into 60, 80, 80, 90, 90, 90, 120, and the average value of the group of brightness values can be obtained. 87 as the target luminance value for all subpixels of that color.

On this basis, in the above step S102, the sub-pixel is obtained according to the actual brightness value of the sub-pixel when each set display data is input and the target brightness value of the sub-pixel when the set display data is input. The compensation mapping relationship is further explained.

For example, according to the actual brightness value of the sub-pixel when each set display data is input and the target brightness value of the sub-pixel when the set display data is input, a plurality of compensation data (compensated) of the sub-pixel can be obtained. The data corresponding to the gray level difference), and according to the multiple compensation data of the sub-pixel, the compensation mapping relationship of the sub-pixel is obtained.

Specifically, according to the _actual luminance value L of the sub-pixel when each set display data is input and the _target luminance value L of the sub-pixel when the set display data is input, multiple compensations of the sub-pixel are obtained. In terms of data, it can be based on the difference between the _actual luminance value Lactual and the _target luminance value Ltarget (that is, _Lactual - _Ltarget ) to obtain multiple compensation data for sub-pixels; it can also be based on the _actual luminance value Lactual and the target. The ratio of the luminance value L _target (that is, _Lactual / _Ltarget ) to obtain multiple compensation data of sub-pixels; it can also be the inverse of the ratio of the _actual luminance value Lactual to the _target luminance value Ltarget (that is, _Ltarget /L ( _actually ) to obtain multiple compensation data of sub-pixels, which is not limited in the present invention.

For another example, the compensation mapping relationship of the sub-pixels may be directly obtained according to the actual luminance value of the sub-pixel when each set display data is input and the target luminance value of the sub-pixel when the set display data is input.

Specifically, taking the brightness value corresponding to the display data with the target brightness value on the gamma curve as an example, referring to FIG. 3 , Y1 is the gamma curve 2.2 (Gamma2.2), which is a known curve, and Y2 is based on the The polyline obtained by connecting the display data corresponding to 0 grayscale, 63 grayscale, 127 grayscale, and 255 grayscale and the corresponding actual brightness (of course, the corresponding 0 grayscale, 63 grayscale, 127 grayscale, and 255 grayscale At least one of the actual brightness exceeds the set brightness deviation range), and the equation of any segment (0-63, 63-127, 127-255) of the polyline of Y2 can be obtained by calculation.

In this case, the compensation mapping relationship of the subpixels can be obtained by combining Y1 and Y2, that is, the corresponding relationship between each first display data and the second display data within the display data value range corresponding to the subpixels.

Specifically, referring to FIG. 3 , it is assumed that during actual display, any first display data corresponds to display data of 90 grayscales in the range of 63 to 127 grayscales. In the case of no compensation, at this time, the sub-pixel The actual brightness is L1, which is quite different from the target brightness L2 (the target brightness L2 of 90 grayscales can be obtained according to Y1). By using the technical solution of the present invention, the second brightness under the target brightness L2 can be obtained through Y2. Display data (that is, bring L2 into Y2 to obtain corresponding display data in the grayscale range of 63-127), in this case, the brightness L1' corresponding to the second display data is compared with the brightness L1 corresponding to the first display data. The target brightness L2 is closer to or equal to the target brightness L2, that is, through Y1 and Y2, the corresponding relationship between each first display data and the second display data in the display data value range corresponding to the sub-pixel can be obtained (ie, the compensation mapping relationship). ), so as to solve the problem of uneven display brightness of the display device; of course, the display data of 90 gray scales is only illustrated here for illustration, and other display data can refer to the above process, which will not be repeated here.

In addition, in order to improve the accuracy of the compensation mapping relationship, that is, the brightness corresponding to the second display data obtained from the first display data through the compensation mapping relationship is closer to the target brightness, in practice, the above Y2 can be fitted according to the type of Y1 (Refer to Y2 in FIG. 4 ), of course, other types of curves can be fitted according to actual compensation needs, which is not specifically limited in the present invention, and a suitable fitting method can be selected according to actual needs.

It should be noted that, whether the compensation mapping relationship corresponding to the first display data and the second display data in each sub-pixel is obtained through compensation data based on the actual brightness value and the target brightness value, or based on the actual brightness value and the target brightness value. The luminance value directly obtains the compensation mapping relationship corresponding to the first display data and the second display data in each sub-pixel. Although the compensation mapping relationship obtained by the two methods is different, the purpose of the two compensation mapping relationships is the same. Compensate the mapping relationship to display the initial display data (first display data) of the screen to obtain the second display data, so as to satisfy the actual brightness value when the second display data (corresponding pixel voltage) is input to the corresponding sub-pixel compared with When the first display data (corresponding pixel voltage) is input to the sub-pixel, the actual luminance value is closer to the target luminance value, thereby achieving luminance uniformity of the entire display screen.

The brightness compensation method of the present invention is further described below through specific data, and the sub-pixels in the entire effective display area are taken as an example, referring to the following table:

It can be seen from the above table that some sub-pixels (the sub-pixels R and G corresponding to the black and bold parts in the above table) have the actual brightness value and the target brightness value when the grayscale L64 (corresponding to the input voltage is 6.4V) is set. There is a difference in brightness between them. At this time, the actual display gray levels of sub-pixel R and sub-pixel G are L60 and L56 respectively, that is, there is a difference between the displayed gray level and the set gray level. In this case, refer to the aforementioned The brightness compensation method is to compensate the sub-pixel, that is, the first display data corresponding to the input voltage of 6.4V is compensated through the compensation mapping relationship to obtain the second display data (that is, the display data corresponding to the input voltage after compensation in the above table). ), at this time, the second display data is input to the above-mentioned sub-pixel R and sub-pixel G to be compensated through the timing controller (T-con), and the compensated input voltage received by the sub-pixel R and sub-pixel G is 6.8V and 7.2V, so that the sub-pixel R and sub-pixel G display gray scale after compensation is consistent with the set gray scale L64, and the displayed brightness value after compensation is consistent with the target brightness value, thereby realizing the brightness uniformity of the entire display screen.

An embodiment of the present invention further provides a brightness compensation device for a display device, wherein the display device includes a plurality of sub-pixels, and the brightness compensation device includes:

Brightness acquisition unit: used to acquire the actual brightness value of each sub-pixel when multiple set display data are input respectively, and the multiple set display data are partial values within the display data value range of the sub-pixel.

It should be noted here that, in order to obtain the actual brightness value of each sub-pixel when multiple set display data are inputted as accurately as possible, in the actual detection process, it is necessary to ensure that the entire detection environment is in an absolute dark state. .

Compensation mapping relationship acquisition unit: used to obtain the compensation mapping relationship of sub-pixels according to the actual brightness value of the sub-pixel when inputting each set display data and the target brightness value of the sub-pixel when inputting the set display data , the compensation mapping relationship is the corresponding relationship between each first display data and the second display data within the value range of the sub-pixel display data, the second display data is obtained after compensating the first display data, and the second display data Within the display data value range of sub-pixels.

In this way, the brightness compensation device directly measures the actual brightness value of the sub-pixel in the display device, and obtains each of the first display data and the second display data of the sub-pixel within the display data value range according to the actual brightness value and the target brightness value. The data compensation mapping relationship, in this way, in the actual display of the display device, the first display data corresponding to each sub-pixel can be compensated according to the obtained compensation mapping relationship. The second display data after compensation can be used for actual display. display, so that the brightness value of the sub-pixel during display can be closer to the target brightness value, that is, compared with the prior art, the brightness of the sub-pixel can only be adjusted by compensating the threshold voltage, resulting in the adjustment of display brightness uniformity. (for example, the problem of uneven display brightness caused by other factors cannot be solved only by compensating for the threshold voltage), in the present invention, by directly compensating the brightness of the measured sub-pixels, it can solve the problem of display devices caused by arbitrary factors. The problem of uneven display brightness (Mura), that is, the problem of uneven display brightness of the display device can be substantially more comprehensively solved.

Further, due to the inevitable difference between the actual brightness value of the sub-pixel and the target brightness value, in practice, according to customer needs, product requirements, etc., the actual brightness value of the sub-pixel when inputting the set display data. It can be regarded as qualified within a certain brightness deviation range. Based on this, the brightness compensation device can also include a judgment unit, and the judgment unit is used to judge whether the actual brightness value of the sub-pixel when a plurality of set display data are inputted respectively. The corresponding luminance deviation range, if at least one of the plurality of actual luminance values corresponding to the plurality of set display data exceeds the corresponding luminance deviation range, the compensation mapping relationship obtaining unit obtains the compensation mapping relationship of the sub-pixels.

That is, when the judgment unit judges that at least one of the actual luminance values of the sub-pixels when the multiple set display data are respectively input exceeds the corresponding luminance deviation range, then step S102 in the above-mentioned luminance compensation method is executed by the compensation mapping relationship acquisition unit. A step of.

An embodiment of the present invention further provides a display device, the display device includes a plurality of sub-pixels, and at the same time the display device further includes a timing controller (T-con) and a data driving circuit, the timing controller is used for A display data generates second display data according to the compensation mapping relationship obtained by any of the aforementioned brightness compensation methods, and outputs the second display data to the data driving circuit.

It should be noted here that, for the display device, the aforementioned brightness compensation device can be integrated into the display device, for example, the brightness acquisition unit in the brightness compensation device can be integrated into each sub-pixel during the manufacturing process of the display device. , the compensation mapping relationship acquisition unit can be integrated into the processor or timing controller inside the display device, so that the display device itself can realize the measurement of sub-pixel brightness and the acquisition of the compensation mapping relationship, and according to the compensation mapping relationship The second display data is generated and output to the data driving circuit.

It is also possible to set the aforementioned brightness compensation device and the display device as two independent parts, for example, the brightness acquisition unit in the brightness compensation device may be a charge coupled device image sensor (Charge Coupled Device, CCD), and the acquisition unit (such as a charge coupled device image sensor) is obtained through the compensation mapping relationship. It can be set in the processor of the PC) according to the actual brightness value measured by the brightness acquisition unit, to obtain the compensation mapping relationship (when using this method to obtain the actual brightness, the cleanliness of the display screen surface should be ensured to avoid the influence of sundries on the light. Then, the acquired acquisition compensation mapping relationship can be stored in the display device, so that the display device can generate the second display data according to the compensation mapping relationship when displaying, And output to the data drive circuit, so that the problem of uneven display brightness of the display device caused by any factor can be solved, that is, the problem of uneven display brightness of the display device can be essentially more comprehensively solved.

Of course, the brightness compensation device in the present invention is not limited to the two setting methods provided above. In practice, part of the brightness compensation device can also be integrated into the display device as needed, which is not specifically limited in the present invention; , using the technical scheme of the present invention, the amount of code (code) data is relatively large, and the takt (TaktTime, TT) requirements are relatively high in actual mass production. In practice, HDMI (High Definition Multimedia Interface, high-definition multimedia interface) to achieve rapid transmission.

It should also be noted here that the display device may at least include a liquid crystal display device (LCD) and an organic light emitting diode (Organic Light Emitting Diode, OLED) display device, and the display device can be applied to liquid crystal displays, liquid crystal televisions, In any product or component with display function, such as digital photo frame, mobile phone or tablet.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. A brightness compensation method for a display device, the display device comprising a plurality of sub-pixels, wherein the brightness compensation method comprises: Acquiring the actual brightness value of each of the sub-pixels when a plurality of set display data are respectively input, and the plurality of set display data are partial values within the value range of the display data of the sub-pixel; According to the actual brightness value of the sub-pixel when each of the set display data is input and the target brightness value of the sub-pixel when the set display data is input, the compensation mapping relationship of the sub-pixel is obtained. The compensation mapping relationship is the corresponding relationship between each first display data and second display data within the display data value range of the sub-pixel, and the second display data is obtained after compensating the first display data , the second display data is located within the display data value range of the sub-pixel; The obtaining of the actual brightness value of each of the sub-pixels when a plurality of set display data are respectively input includes: For each of the set display data, obtain a plurality of luminance values of each of the sub-pixels when the set display data is input multiple times, and use the average value of the plurality of luminance values as the sub-pixel Corresponds to the actual brightness value under the display data that should be set. 2. The brightness compensation method according to claim 1, wherein the brightness compensation method further comprises: Judging whether the actual brightness value of the sub-pixel when multiple set display data are inputted respectively belongs to the corresponding brightness deviation range, if at least one of the multiple actual brightness values corresponding to the multiple set display data is actual brightness value beyond the corresponding brightness deviation range, then obtain the Compensation mapping relationship for sub-pixels. 3. The brightness compensation method according to claim 1, wherein, The compensation mapping relationship of the sub-pixel is obtained according to the actual brightness value of the sub-pixel when each of the set display data is input and the target brightness value of the sub-pixel when the set display data is input. include: According to the actual brightness value of the sub-pixel when each of the set display data is input and the target brightness value of the sub-pixel when the set display data is input, obtain a plurality of compensation data of the sub-pixel, According to a plurality of compensation data of the sub-pixels, the compensation mapping relationship of the sub-pixels is acquired. 4. The brightness compensation method according to claim 1, wherein, The plurality of sub-pixels are all sub-pixels in an effective display area of the display device. 5. The brightness compensation method according to any one of claims 1-4, wherein, The target brightness value of the sub-pixel when the set display data is input: the brightness value corresponding to the set display data on the gamma curve; Or, the target brightness value of the sub-pixels when the set display data is input: the actual brightness values corresponding to the sub-pixels of the sub-pixels of the same color when the set display data is input The average brightness value located in the first brightness value range; wherein, the first brightness value range is: the brightness value range with the highest occurrence frequency among the actual brightness values corresponding to each of the sub-pixels of the same color; Or, the target brightness value of the sub-pixels when the set display data is input: an average brightness value of the actual brightness values of the sub-pixels of the same color when the set display data is input. 6. A brightness compensation device for a display device, wherein the display device comprises a plurality of sub-pixels, and the brightness compensation device comprises: Brightness acquisition unit: used to acquire the actual brightness value of each of the sub-pixels when a plurality of set display data are respectively input, and the plurality of set display data are within the value range of the display data of the sub-pixels part of the value; Compensation mapping relationship acquisition unit: used for acquiring the sub-pixel according to the actual brightness value of the sub-pixel when each of the set display data is input and the target brightness value of the sub-pixel when the set display data is input. The compensation mapping relationship of the sub-pixels, the compensation mapping relationship is the corresponding relationship between each first display data and the second display data within the value range of the display data of the sub-pixels, and the second display data is the corresponding relationship between the first display data and the second display data. A display data is obtained after compensation, and the second display data is within the value range of the display data of the sub-pixel. 7. The brightness compensation device according to claim 6, wherein the brightness compensation device further comprises a judgment unit; The judging unit is used to judge whether the actual brightness value of the sub-pixels when a plurality of set display data are inputted respectively belong to the corresponding brightness deviation range, if the actual brightness values corresponding to the multiple set display data are If at least one of the values exceeds the corresponding luminance deviation range, the compensation mapping relationship of the sub-pixel is obtained by the compensation mapping relationship obtaining unit. 8. A display device comprising a plurality of sub-pixels, wherein the display device further comprises a timing controller and a data driving circuit; The timing controller is configured to generate the second display data from the first display data of each sub-pixel according to the compensation mapping relationship obtained by the brightness compensation method according to any one of claims 1-5, and output it to the second display data. Describe the data drive circuit.

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