Brightness adjustment method, brightness adjustment device and display device

Abstract

A brightness adjustment method, a brightness adjustment device and a display device. The brightness adjustment method includes: dividing M first regions according to the distribution state of the common voltage V com , and the difference between the common voltages V com in different first regions is greater than a first threshold value (S01); dividing N second regions according to the distribution state of the pixel voltage V pixel , and the difference between the pixel voltages V pixel in different second regions is greater than a second threshold value (S02); calculating the voltage compensation value in each first region (S03); calculating the voltage compensation value in each second region (S04); overlapping the M first regions and the N second regions to obtain M×N adjustment regions (S05); calculating the Gamma voltage values of each adjustment region at different gray levels to obtain a set of Gamma data for the M×N adjustment regions (S06); driving a display module to display according to the Gamma data (S07), which can make the picture brightness uniform and effectively solve the problem of afterimage caused by insufficient charging and uneven charging.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to a brightness adjustment method, a brightness adjustment device, and a display device. Background Art

[0002] The sensitivity of the human eye to the change in the brightness of a display screen is related to the brightness of the screen, and the human eye is most sensitive to the change in the brightness of the screen at low brightness. Liquid crystal display is digitally driven, that is, the brightness of the display screen is divided into several gray levels. In order to make the relationship between the digital gray levels and the brightness change perceived by the human eye linear, Gamma voltage is introduced. In the related art, Gamma data can be preset in a display device, and during brightness adjustment, partition adjustment can be performed according to the stored Gamma data.

[0003] When a liquid crystal display shows the same screen for a long time and then switches to the next screen, the previous screen will remain in the next screen, and this phenomenon is called image sticking (image sticking is also called Image Sticking). When V pixel (pixel voltage) is undercharged, and when V com (common voltage) is unevenly charged and deviates in some areas, resulting in uneven brightness, the problem of image sticking is particularly serious. Summary of the Invention

[0004] Embodiments of the present disclosure provide a brightness adjustment method, a brightness adjustment device, and a display device, which can make the screen brightness uniform and effectively solve the problem of image sticking caused by undercharging and uneven charging.

[0005] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0006] Embodiments of the present disclosure provide a brightness adjustment method, including:

[0007] According to the distribution state of the common voltage V com in the current display screen, the current display screen is partitioned into M first regions, and the difference between the common voltages V com in different first regions is greater than a first threshold, where M is an integer greater than 1;

[0008] According to the distribution state of the pixel voltage V pixel in the current display screen, the current display screen is partitioned into N second regions, and the difference between the pixel voltages V pixel in different second regions is greater than a second threshold, where N is an integer greater than 1;

[0009] Calculate the voltage compensation value in each first region, where the voltage compensation value of the m-th first region is ΔV m , where m is an integer between 1 and M;

[0010] Calculate the voltage compensation values in each of the second regions, where the voltage compensation value of the nth second region is ΔV n , where n is an integer between 1 and N;

[0011] Overlap the M first regions and the N second regions to obtain M×N adjustment regions;

[0012] Calculate the Gamma voltage values of each of the adjustment regions at different gray levels to obtain a set of Gamma data for the M×N adjustment regions, where the Gamma voltage value of the adjustment region obtained by overlapping the mth first region and the nth second region is V+ΔV m +ΔV n , where V is the gray-level voltage at the current gray level;

[0013] Drive the display module to display according to the Gamma data.

[0014] Exemplarily, in the method, the common voltage compensation value ΔV of the mth first region m is calculated by the following formula (I):

[0015] ΔV m =V m -V p (I)

[0016] where V p为 is the average value of the common voltages V of the M first regions; V com is the value of the common voltage V of the mth first region m . com

[0017] Exemplarily, in the method, the pixel voltage compensation value ΔV of the nth second region n is calculated by the following formula (II):

[0018] ΔV n =V n -V p ’ (II)

[0019] where V p ’ 为 is the average value of the pixel voltages V of the N second regions, and V pixel is the value of the pixel voltage V of the nth second region n . pixel

[0020] Exemplarily, in the said according to the common voltage V in the current display screen com ​​Before partitioning the current display screen into M first regions according to the distribution state, the method further includes:

[0021] Detecting the ambient light luminance at different positions of the current display screen;

[0022] Querying a pre-stored correspondence table to determine the voltage compensation values at different positions, where the correspondence table includes the correspondence between the ambient light luminance and the voltage compensation values;

[0023] Determining the common voltage V in the current display screen according to the relationship between the voltage compensation values at different positions on the current display screen and the corresponding positions com and the pixel electrode V pixel voltage distribution state.

[0024] Exemplarily, between the querying of the predetermined correspondence table, the method further includes a step of obtaining the correspondence table, specifically including:

[0025] Detecting the ambient light luminance at different positions of the test display screen;

[0026] Calculating the average value of the ambient light luminance of the test display screen as the luminance standard;

[0027] Calculating the difference between the ambient light luminance at different positions on the test display screen and the luminance standard, and determining the voltage compensation value corresponding to each ambient light luminance according to the difference to obtain the correspondence table.

[0028] Exemplarily, the detecting the ambient light luminance at different positions of the test display screen specifically includes:

[0029] Dividing the test display screen into a plurality of sub-regions arranged in an array of L rows and D columns, where both L and D are positive integers greater than or equal to 1;

[0030] Arranging photosensitive sensors in the outermost first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region among the plurality of sub-regions arranged in an array to obtain the ambient light luminance at different positions of the test display screen;

[0031] and / or

[0032] The detecting the ambient light luminance at different positions of the current display screen specifically includes:

[0033] Dividing the current display screen into a plurality of sub-regions arranged in an array of L rows and D columns, where both L and D are positive integers greater than or equal to 1;

[0034] In the first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region located at the periphery among the multiple sub-regions arranged in an array, photosensitive sensors are arranged to obtain the ambient light brightness at different positions of the current display screen.

[0035] An embodiment of the present disclosure further provides a brightness adjustment device, including:

[0036] A first partitioning module, configured to partition the current display screen into M first regions according to the distribution state of the common voltage V com in the current display screen, where the difference between the common voltages V com of different said first regions is greater than a first threshold, and M is an integer greater than 1;

[0037] A second partitioning module, configured to partition the current display screen into N second regions according to the distribution state of the pixel voltage V pixel in the current display screen, where the difference between the pixel voltages V pixel of different said second regions is greater than a second threshold, and N is an integer greater than 1;

[0038] A first calculation module, configured to calculate the voltage compensation value in each of the first regions, where the voltage compensation value of the m-th first region is ΔV m , and m is an integer between 1 and M;

[0039] A second calculation module, configured to calculate the voltage compensation value in each of the second regions, where the voltage compensation value of the n-th second region is ΔV n , and n is an integer between 1 and N;

[0040] A third partitioning module, configured to obtain M×N adjustment regions by overlapping the M first regions and the N second regions;

[0041] A third calculation module, configured to calculate the Gamma voltage value of each of the adjustment regions at different gray levels to obtain a set of Gamma data for the M×N adjustment regions, where the Gamma voltage value of the adjustment region obtained by overlapping the m-th first region and the n-th second region is V + ΔV m +ΔV n , and V is the gray level voltage at the current gray level;

[0042] A driving module, configured to drive the display module to perform display according to the Gamma data.

[0043] Exemplarily, the first calculation module specifically calculates the common voltage compensation value ΔV of the m-th first region according to the following formula (I) m :

[0044] ΔV m = V m - V p (I)

[0045] Wherein, V p为 is the average value of the common voltages V of the M first regions; V com is the value of the common voltage V of the m-th first region. m com n n

[0046] Exemplarily, the second calculation module is specifically configured to calculate the pixel voltage compensation value ΔV of the n-th second region according to the following formula (II): n :

[0047] ΔV n = V n - V p ’ (II)

[0048] Wherein, V p ’ 为 is the average value of the pixel voltages V of the N second regions, and V pixel is the value of the pixel voltage V of the n-th second region. n pixel com pixel

[0049] Exemplarily, the brightness adjustment device further includes:

[0050] a photosensor, configured to detect the ambient light brightness at different positions of the current display screen;

[0051] a query module, configured to query a pre-stored correspondence table to determine the voltage compensation values at different positions, where the correspondence table includes the correspondence between the ambient light brightness and the voltage compensation values;

[0052] a determination module, configured to determine the voltage distribution states of the common voltage V com and the pixel electrode V pixel in the current display screen according to the relationship between the voltage compensation values at different positions on the current display screen and the corresponding positions.

[0053] Exemplarily, the brightness adjustment device further includes: an acquisition module, configured to acquire the correspondence table, and the acquisition module specifically includes:

[0054] a receiving unit, configured to measure the ambient light brightness at different positions of the display screen;

[0055] a first calculation unit, configured to calculate the average value of the ambient light brightness of the measured display screen as the brightness standard;

[0056] A second calculation unit calculates the difference between the ambient light brightness at different positions in the test display screen and the brightness standard;

[0057] A data processing unit is configured to determine a voltage compensation value corresponding to each ambient light brightness according to the difference, so as to obtain the correspondence table.

[0058] Exemplarily, the photosensitive sensor is integrated on the display module, and the display screen of the display module is divided into a plurality of sub-regions arranged in an array according to L rows and D columns, where both L and D are positive integers greater than or equal to 1; the photosensitive sensors are arranged in the first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region located on the periphery among the plurality of sub-regions arranged in an array.

[0059] An embodiment of the present disclosure further provides a display device, including the brightness adjustment device as described above.

[0060] The beneficial effects brought by the embodiments of the present disclosure are as follows:

[0061] The brightness adjustment method, brightness adjustment device, and display device provided by the embodiments of the present disclosure perform analog Gamma partition adjustment through the overlapping partition method, that is, by combining the change of the common voltage V in different regions of the display screen and the charging change of the pixel voltage V in different regions, overlapping these two change regions together for partitioning to adjust the analog Gamma value, so that the brightness of different regions of the display screen is uniform, the adjustment range is relatively large, and the problem of afterimages caused by uneven or insufficient charging can be solved more effectively. com in different regions, and the charging change of the pixel voltage V pixel in different regions, overlapping these two change regions together for partitioning to adjust the analog Gamma value, so that the brightness of different regions of the display screen is uniform, the adjustment range is relatively large, and the problem of afterimages caused by uneven or insufficient charging can be solved more effectively. Description of the Drawings

[0062] Figure 1 A schematic diagram showing the voltage distribution state of the common voltage V in some display modules, where the solid line represents the V com voltage equipotential line; com voltage equipotential line;

[0063] Figure 2 A schematic diagram showing the voltage distribution state of the pixel voltage V in some display modules, where the solid line represents the V pixel voltage equipotential line; pixel voltage equipotential line;

[0064] Figure 3 A partition schematic diagram in the brightness adjustment method in some embodiments of the present disclosure;

[0065] Figure 4 A layout diagram of photosensitive sensors of a small-sized display module in some embodiments;

[0066] Figure 5Schematic layout diagram of photosensitive sensors of small and medium-sized display modules in some embodiments;

[0067] Figure 6 Schematic layout diagram of photosensitive sensors of medium-sized display modules in some embodiments;

[0068] Figure 7 Schematic layout diagram of photosensitive sensors of large-sized display modules in some embodiments;

[0069] Figure 8 Schematic flow chart of the brightness adjustment method provided by the embodiments of the present disclosure. Detailed implementation manners

[0070] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are some but not all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0071] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and the like used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. Similarly, the terms such as "a", "an", or "the" do not denote a quantity limitation, but mean that there is at least one. The terms "including" or "comprising" and the like mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0072] Before elaborating on the brightness adjustment method, brightness adjustment device, and display device provided by the embodiments of the present disclosure, it is necessary to make the following explanations regarding related technologies:

[0073] In the related art, Gamma data can be preset in a display device. When performing brightness adjustment, zonal adjustment can be performed according to the stored Gamma data. The zonal method adopted during Gamma adjustment is Digital Gamma (digital control circuit) zoning, and the brightness adjustment effect on the display screen is relatively weak. When a liquid crystal display shows the same picture for a long time and then switches to the next picture, the previous picture will remain in the next picture, and this phenomenon is called image sticking (image sticking is also called Image Sticking). When V pixel (pixel voltage) is undercharged and V com (common voltage) is unevenly charged and deviates in some areas, resulting in uneven brightness, the problem of image sticking is particularly serious.

[0074] In view of the above problems, embodiments of the present disclosure provide a brightness adjustment method, a brightness adjustment device, and a display device, which can make the brightness of different areas more uniform, and the adjustment range is relatively large, and can more effectively solve the problem of image sticking caused by undercharging and uneven charging.

[0075] The inventors have found through research that for a display module, the changes in the common voltage V com and the pixel voltage V pixel on the display screen are different.

[0076] Figure 1 The figure shows a schematic diagram reflecting the voltage distribution state of the common voltage V com in some display modules (that is, the voltage change of the common voltage V com ), where the solid line represents the V com voltage equipotential line. Figure 2 The figure shows a schematic diagram reflecting the voltage distribution state of the pixel voltage V pixel in some display modules (that is, the voltage change of the common voltage V com ), where the solid line represents the V pixel voltage equipotential line.

[0077] As Figure 1 shown, for the common voltage V com , its voltage distribution is generally such that the closer it is to the center, the more the V com value deviates from the target value. As Figure 2 shown, for the pixel voltage V pixel , the solid line zoning reflects the zoning situation where the V pixel charging effects are inconsistent, and the voltage distribution is generally gradually changing from the proximal end to the distal end of the display module. Therefore, the changes in the common voltage V com and the pixel voltage V pixel will cause deviations in Gamma in different areas.

[0078] In the related technologies, Digital Gamma (digital control circuit) is used for zoning, and during zoning compensation, look-up table compensation is performed according to the RGB grayscale values of the input picture. Compensation is based on a theoretical value and is digital compensation, so the effect is not obvious, and the effect on the brightness adjustment of the display picture is relatively weak. Because of uneven charging, there is a problem that the brightness is uneven due to deviation in some areas, especially the problem of ghosting is serious. com There is a problem that the brightness is uneven due to deviation in some areas, especially the problem of ghosting is serious.

[0079] Through research, the inventor adopted an overlapping zoning Gamma zoning method to improve the brightness uniformity of different regions, and the adjustable range is relatively large, which can effectively solve the problem of uneven brightness, and then improve the ghosting phenomenon.

[0080] As Figure 8 shown, the brightness adjustment method provided by the embodiment of the present disclosure includes the following steps:

[0081] Step S01: According to the distribution state of the common voltage V com in the current display picture, the current display picture is divided into M first regions, and the difference between the common voltages V com in different first regions is greater than a first threshold, and M is an integer greater than 1;

[0082] Step S02: According to the distribution state of the pixel voltage V pixel in the current display picture, the current display picture is divided into N second regions, and the difference between the pixel voltages V pixel in different second regions is greater than a second threshold, and N is an integer greater than 1;

[0083] Step S03: Calculate the common voltage compensation value in each first region, where the common voltage compensation value of the m-th first region is ΔV m , and m is an integer between 1 and M;

[0084] Step S04: Calculate the pixel voltage compensation value in each second region, where the pixel voltage compensation value of the n-th second region is ΔV n , and n is an integer between 1 and N;

[0085] Step S05: Overlap the M first regions and the N second regions to obtain M×N adjustment regions;

[0086] Step S06: Calculate the Gamma voltage value of each adjustment region at different gray levels to obtain a set of Gamma data for the M×N adjustment regions. Among them, the Gamma voltage value of the adjustment region obtained by overlapping the m-th first region and the n-th second region is V+ΔV m+ΔV n , where V is the gray-scale voltage at the current gray scale;

[0087] Step S07: Drive the display module to display according to the Gamma data.

[0088] In the above solution, the Digital Gamma zoning method adopted in the related art is changed, and an overlapping zoning method is adopted, that is, the voltage change of the common voltage and the charging change of the pixel voltage are combined, and the two change regions are overlapped to perform Gamma zoning adjustment. In this way, the brightness uniformity can be improved, and the adjustable range is relatively larger, effectively solving the problem of uneven brightness, and further effectively solving the ghosting problem caused by insufficient charging and uneven charging.

[0089] It should be noted that the common voltage V in the above step S01 com zoning step, the pixel voltage V in step S02 pixel The front and back orders of the zoning steps can be interchanged and are not limited. The front and back orders of step S03 and step S04 can be interchanged.

[0090] In step S01, the distribution state of the common voltage V com refers to the change state of the common voltage V com . According to the change of the common voltage V com , M first regions are divided. The zoning principle can be: the common voltage V within the same first region com is approximately equal or the difference is within a certain range, and the difference between the common voltages V between different first regions com is greater than the first threshold. This first threshold can be determined in advance according to experience, etc.

[0091] Taking the Figure 3 shown embodiment as an example, M can be equal to 4. Therefore, the display screen is sequentially divided into 4 first regions from the center outwards, namely region A, region B, region C, and region D. It should be noted that the above is only an example. In actual applications, for different display products, the number of zoning of the first region can be adjusted according to the change data of the common voltage V com of the specific product according to the above zoning principle. The above is only an example and is not limited thereto.

[0092] In addition, it should also be noted that Figure 3 in the example of com , when zoning according to the change of the common voltage V comWhen partitioning the varying regions, the voltage equipotential lines do not necessarily arrange according to this rule. For example, the widths of different first regions are not necessarily equal, or the same first region is not necessarily symmetric about the center of the display screen, or the voltage equipotential lines are not necessarily straight lines and can also be oblique lines or irregular lines, etc.

[0093] In step S02, the pixel voltage V pixel The distribution state, that is, the charging change of the pixel voltage V pixel According to the change of the pixel voltage V pixel N second regions are divided. The partitioning principle can be as follows: The pixel voltages V within the same second region pixel Are approximately equal or the difference is within a certain range, and the difference between the pixel voltages V between different first regions pixel Is greater than the second threshold. This second threshold can be predetermined according to experience, etc.

[0094] Taking the embodiment shown in the figure as an example, N can be equal to 4. From the proximal end to the distal end of the display screen, it is divided into 4 first regions, namely region 1, region 2, region 3, and region 4. It should be noted that the above is only an example. In actual applications, for different display products, the number of partitions of the second region can be adjusted according to the change data of the pixel voltage V pixel According to the above partitioning principle, and the above is only an example and not limited thereto.

[0095] In addition, it should also be noted that Figure 3 In the example of pixel When partitioning according to the charging change of the pixel voltage V, the voltage equipotential lines are partitioned more regularly from the proximal end to the distal end. However, this is only a schematic. For different display products, in actual applications, when partitioning according to the charging change of the pixel voltage V pixel The voltage equipotential lines do not necessarily arrange according to this rule. For example, the widths of different second regions are not necessarily equal, or the voltage equipotential lines are not necessarily straight lines and can also be oblique lines or irregular lines, etc.

[0096] In addition, it should be noted that in the above example, M = N = 4, but in actual applications, the values of M and N can be the same or different, and the number of partitions of the first region and the second region can be adjusted according to the change data of the common voltage V com And the pixel voltage V pixel According to the above partitioning principle.

[0097] In step S05, after overlapping the M first regions and the N second regions, M×N adjustment regions can be obtained, and these adjustment regions are numbered: A1, B1, C1, D1, A2, B2, C2, D2, …… mn……MN.

[0098] Still takingFigure 3 Taking the example shown, after 4 first regions and 4 second regions overlap, 16 adjustment regions are obtained. Combining Figure 3 , these 16 partitions are shown in Table 1 below:

[0099] Table 1

[0100]

[0101] It should be noted here that as Figure 3 shown, when the coverage of the first region approaching the center and the second region near the proximal end is small and there is no overlap, the actual number of divided adjustment regions may not be M×N. However, theoretically, it can be considered here that the Gamma voltage value of the adjustment region where no overlap occurs is the same as that of the adjacent adjustment region.

[0102] For example, still taking the partition result in Table 1 as an example, in the actual picture as shown, there is no overlap between the 3rd region, the 4th region and the D region. That is, the D3 region and the D4 region do not overlap. At this time, it can be considered that the Gamma voltage value of the D3 region is the same as that of the adjacent C3 region; the Gamma voltage value of the D4 region is the same as that of the adjacent B4 region.

[0103] In step S06, when calculating the Gamma voltage value of each adjustment region at different gray levels, the Gamma voltage value of each adjustment region at different gray levels is equal to the sum of the gray level voltage at the current gray level, the common voltage compensation value of the first region where the adjustment region is located, and the pixel voltage compensation value of the second region where the adjustment region is located. That is to say, first calculate the common voltage compensation value of each first region; then, according to the change of pixel voltage charging, the analog Gamma value is preliminarily adjusted, and the adjustment result is partitioned and fitted with the common voltage compensation value of each first region to obtain a new set of Gamma values for analog Gamma partition adjustment using the overlapping partition method.

[0104] Taking Figure 3 the embodiment shown as an example, for each adjustment region to perform Gamma voltage adjustment, the common voltage V com is divided into four first regions A, B, C, and D, and according to the pixel voltage, it is divided into four second regions 1, 2, 3, and 4. After overlapping, 16 adjustment regions are obtained. Taking the A1 region as an example, first determine the voltage compensation value ΔV com of the A region V A , and then determine the charging attenuation degree ΔV pixel of the 1 region V s . Then the analog Gamma value of the A1 region at GL255 is V 255 +ΔV A +ΔV s , and the analog Gamma value at G L0 is V0 +ΔV A +ΔV s The other fifteen partitions are analogous to each other, and a set of simulated Gamma data for each adjustment area is obtained. This method has a relatively large adjustment range, and the brightness of the panel can be adjusted according to the newly generated sixteen pairs of simulated Gamma values ​​to achieve the purpose of adjusting the brightness uniformly.

[0105] Exemplarily, in step S03, for each first region, the common voltage compensation value ΔV of the mth first region is m Calculated by the following formula (I):

[0106] ΔV m =V m -V p (I)

[0107] Among them, V p为 The common voltage V of the M first regions com Average value; V m is the common voltage V of the mth first region com value.

[0108] Exemplarily, in step S04, the pixel voltage compensation value ΔV of the nth second region is n Calculated by the following formula (II):

[0109] ΔV n =V n -V p ' (II)

[0110] Among them, V p ' 为 N pixel voltages V of the second regions pixel Average value, V n is the pixel voltage V of the nth second region pixel value.

[0111] by Figure 3 For example, the common voltage V of the four regions A, B, C, and D can be A 、V B 、V C 、V D Calculate the average common voltage V p , that is, V p =(V A +V B +V C +V D ) / 4, and then calculate the difference ΔV of each first area A Taking area A as an example, ΔV A= V A -V p , this difference ΔV A is the common voltage compensation value for area A. By analogy for the other three areas B, C, and D, ΔV A , ΔV B , ΔV C , and ΔV D are obtained. Similarly, for the four second areas 1, 2, 3, and 4, the average pixel voltage V p’ can be calculated by calculating the pixel voltages of areas 1, 2, 3, and 4. V p’ = (V 1 + V 2 + V 3 + V 4 ) / 4. Then, calculate the difference ΔV s between the pixel voltage of each second area and the average pixel voltage. Taking area 1 as an example, ΔV 1 = V 1 - V p’ . This difference ΔV 1 is the pixel voltage compensation value for area 1.

[0112] Of course, it can be understood that in other embodiments, the method for obtaining the pixel voltage compensation value and the common voltage compensation value in each adjustment area is not limited to this.

[0113] In the related art, the existing partition compensation is to perform look-up table compensation according to the RGB grayscale value of the input image. It is compensated according to a theoretical value and mostly digital compensation. The effect is not obvious because there is uneven charging, and there is a problem of uneven brightness caused by V com deviating in some areas.

[0114] To further solve this problem, in the brightness adjustment method in the embodiments of the present disclosure, the actual brightness situation can be detected by a photosensor, and the voltage compensation can be performed more accurately according to the actual brightness value fed back by the photosensor, so as to solve the problems of uneven charging and residual images, and ensure that the displayed brightness is uniform in any environment.

[0115] Exemplarily, before step S01 in the method, the following steps are further included:

[0116] S01': Detect the ambient light brightness at different positions of the current display image;

[0117] S02': Query the pre-stored correspondence table to determine the voltage compensation value at different positions. The correspondence table includes the correspondence between the ambient light brightness and the voltage compensation value;

[0118] S03’. Determine the common voltage V in the current display screen based on the relationship between the voltage compensation values at different positions on the current display screen and the corresponding positions. com and the pixel electrode voltage V pixel voltage distribution state.

[0119] It should be noted here that through the correspondence between the voltage compensation value and the position, the change of the common voltage and the change of the pixel voltage can be reflected.

[0120] In the above solution, the detection of the ambient light is incorporated into the Gamma adjustment of the display module. Especially for large-size display products, the brightness can be adaptively adjusted according to the environmental conditions, and the zonal compensation for balancing the brightness of the entire screen is combined during the adaptive brightness adjustment. Among them, the photosensitive sensor is used to detect the ambient light, calculate the current ambient light brightness of each zone and the difference between each zone; when there is a voltage drop in each zone resulting in uneven brightness, the voltage compensation data can be queried from the correspondence table, and the common voltage V com and the pixel electrode voltage V pixel voltage distribution state. That is to say, according to the actual brightness value fed back by the photosensitive sensor, the voltage compensation is carried out more accurately.

[0121] It should also be noted that before the above step S01’, the method may further include the step of obtaining the correspondence table. This step of obtaining the correspondence table can be carried out during the test stage of the display product. Specifically, it includes:

[0122] S01”. Detect the ambient light brightness at different positions of the test display screen;

[0123] S02”. Calculate the average value of the ambient light brightness of the test display screen as the brightness standard;

[0124] S03”. Calculate the difference between the ambient light brightness at different positions on the test display screen and the brightness standard, and determine the voltage compensation value corresponding to each ambient light brightness according to the difference to obtain the correspondence table.

[0125] In this way, the above solution can report the ambient light brightness according to the function of the photosensitive sensor, calculate the average brightness as the brightness standard, calculate the brightness difference of each zone for table lookup compensation, so as to guide the screen brightness, and then call the lookup table according to the voltage compensation algorithm for voltage compensation.

[0126] In addition, in some embodiments, in the brightness adjustment method provided by the embodiments of the present disclosure, a photosensitive sensor is used to detect the ambient light brightness, and the photosensitive sensor needs to detect the ambient light brightness both in the test stage and in the gamma adjustment stage.

[0127] The photosensitive sensor can be integrated on the display module. To avoid the photosensitive sensor affecting the display, during application, the photosensitive sensor cannot be distributed at the center of the display module. Therefore, the embodiments of the present disclosure also provide specific steps for the photosensitive sensor to detect the ambient light brightness, as follows:

[0128] In the test stage: divide the test display screen into multiple sub-regions arranged in an array of L rows and D columns, where both L and D are positive integers greater than or equal to 1; arrange photosensitive sensors in the first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region located on the periphery among the multiple sub-regions arranged in an array to obtain the ambient light brightness at different positions of the test display screen.

[0129] In the Gamma adjustment stage: divide the current display screen into multiple sub-regions arranged in an array of L rows and D columns, where both L and D are positive integers greater than or equal to 1; arrange photosensitive sensors in the first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region located on the periphery among the multiple sub-regions arranged in an array to obtain the ambient light brightness at different positions of the current display screen.

[0130] The main function of the ambient light detection in the test stage is to obtain the corresponding relationship table (LUT) according to the test results (brightness values), and this corresponding relationship table includes the relationship between the ambient light brightness value and the voltage compensation value. That is, this corresponding relationship table gives the voltage compensation values to be compensated for different brightness differences.

[0131] It should be noted that there is no limit to the number of partitions of the sub-regions, and it can be adjusted according to the test data of the actual product.

[0132] For example, for Figure 4 the small-sized display module shown, it can be divided into only two sub-regions, 1 and 2, and one photosensitive sensor is set in each sub-region; for Figure 5 the medium-small-sized display module shown, it can be divided into only four sub-regions, 1, 2, 3, and 4, and one photosensitive sensor is set in each sub-region; for Figure 6 the medium-sized display module shown, it can be divided into sub-regions of 4 rows and 4 columns, and photosensitive sensors are arranged only in the peripheral sub-regions (i.e., the sub-regions labeled 1 to 12 in the figure); for Figure 7 the large-sized display module shown, it can be divided into sub-regions of 11 rows and 7 columns, and photosensitive sensors are arranged only in the peripheral sub-regions (i.e., the sub-regions labeled 1 to 32 in the figure).

[0133] It should be understood that the above is only an exemplary embodiment of the ambient light detection, and in actual applications, it is not limited thereto.

[0134] In addition, an embodiment of the present disclosure further provides a brightness adjustment device, including:

[0135] A first partitioning module, configured to partition the current display screen into M first regions according to the distribution state of the common voltage V com in the current display screen, where the difference between the common voltages V com of different first regions is greater than a first threshold, and M is an integer greater than 1;

[0136] A second partitioning module, configured to partition the current display screen into N second regions according to the distribution state of the pixel voltage V pixel in the current display screen, where the difference between the pixel voltages V pixel of different second regions is greater than a second threshold, and N is an integer greater than 1;

[0137] A first calculation module, configured to calculate the voltage compensation value in each of the first regions, where the voltage compensation value of the m-th first region is ΔV m , and m is an integer between 1 and M;

[0138] A second calculation module, configured to calculate the voltage compensation value in each of the second regions, where the voltage compensation value of the n-th second region is ΔV n , and n is an integer between 1 and N;

[0139] A third partitioning module, configured to overlap the M first regions and the N second regions to obtain M×N adjustment regions;

[0140] A third calculation module, configured to calculate the Gamma voltage values of each of the adjustment regions at different gray levels to obtain a set of Gamma data for the M×N adjustment regions, where the Gamma voltage value of the adjustment region obtained by overlapping the m-th first region and the n-th second region is V+ΔV m +ΔV n , and V is the gray level voltage at the current gray level;

[0141] A driving module, configured to drive the display module to perform display according to the Gamma data.

[0142] Exemplarily, the brightness adjustment device further includes:

[0143] A photosensor, configured to detect the ambient light brightness at different positions of the current display screen;

[0144] A query module, configured to query a pre-stored correspondence table to determine the voltage compensation values at different positions, where the correspondence table includes the correspondence between the ambient light brightness and the voltage compensation values;

[0145] A determining module, configured to determine the common voltage V in the current display screen according to the relationship between the voltage compensation values at different positions on the current display screen and the corresponding positions com and the pixel electrode voltage V pixel voltage distribution state.

[0146] Exemplarily, the brightness adjustment device further includes: an acquisition module, configured to acquire the correspondence table, and the acquisition module specifically includes:

[0147] A receiving unit, configured to measure the ambient light brightness at different positions of the display screen;

[0148] A first calculation unit, configured to calculate the average value of the ambient light brightness of the measured display screen as the brightness standard;

[0149] A second calculation unit, calculating the difference between the ambient light brightness at different positions on the measured display screen and the brightness standard;

[0150] A data processing unit, configured to determine the voltage compensation value corresponding to each ambient light brightness according to the difference to obtain the correspondence table.

[0151] Exemplarily, the photosensitive sensor is integrated on the display module, and the display screen of the display module is divided into a plurality of sub-regions arranged in an array of L rows and D columns, where both L and D are positive integers greater than or equal to 1; the photosensitive sensors are arranged in the first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region located on the periphery among the plurality of sub-regions arranged in an array.

[0152] Exemplarily, the first calculation module specifically calculates the common voltage compensation value ΔV of the m-th first region according to the following formula (I) m :

[0153] ΔV m =V m -V p (I)

[0154] where, V p为 is the average value of the common voltage V of M first regions; V com is the common voltage V of the m-th first region m value. com value.

[0155] Exemplarily, the second calculation module is specifically configured to calculate the pixel voltage compensation value ΔV of the n-th second region according to the following formula (II) n :

[0156] ΔV n =Vn -V p ’ (II)

[0157] Among them, V p ’ 为 The pixel voltage V of N said second regions pixel Average value, V n is the pixel voltage V of the nth said second region pixel value.

[0158] Obviously, the brightness adjustment device provided by the embodiments of the present disclosure can also bring the corresponding beneficial effects brought by the brightness adjustment method provided by the embodiments of the present disclosure, which will not be elaborated herein.

[0159] The embodiments of the present disclosure also provide a display device, including the brightness adjustment device provided by the embodiments of the present disclosure. Obviously, the display device provided by the embodiments of the present disclosure can also bring the beneficial effects brought by the brightness adjustment method provided by the embodiments of the present disclosure, which will not be elaborated herein.

[0160] The following points need to be explained:

[0161] (1) The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0162] (2) For clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of the layer or region is enlarged or reduced, that is, these drawings are not drawn according to the actual scale. It can be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element can be "directly" on or under the other element or there can be an intermediate element.

[0163] (3) Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0164] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A brightness adjustment method, characterized in that, comprising: According to the distribution state of the common voltage V com in the current display screen, the current display screen is partitioned into M first regions, and the difference between the common voltages V com of different said first regions is greater than a first threshold value, where M is an integer greater than 1; According to the distribution state of the pixel voltage V in the current display screen pixel , the current display screen is partitioned into N second regions, and the difference between the pixel voltages V of different said second regions pixel is greater than a second threshold value, where N is an integer greater than 1; Calculate the voltage compensation values in each of the first regions, where the voltage compensation value of the m-th first region is ΔV m , where m is an integer between 1 and M; Calculate the voltage compensation value in each of the second regions, where the voltage compensation value of the nth second region is ΔV n , where n is an integer between 1 and N; Overlapping the M first regions and the N second regions to obtain M×N adjustment regions; Calculate the Gamma voltage values of each of the adjustment regions at different gray levels to obtain a set of Gamma data for M×N of the adjustment regions, where the Gamma voltage value of the adjustment region obtained by overlapping the m-th first region and the n-th second region is V+ΔV m +ΔV n , where V is the gray level voltage at the current gray level; Driving the display module to perform display according to the Gamma data.

2. The brightness adjustment method according to claim 1, characterized in that, In the method described above, the common voltage compensation value ΔV of the m-th first region m is calculated by the following formula (I): ΔV m = V m - V p (I) Among them, V p为 is the common voltage V of M of the first regions com average value; V m is the common voltage V value of the m-th of the first regions com value.

3. The brightness adjustment method according to claim 1, characterized in that, In the method described above, the pixel voltage compensation value ΔV of the n-th second region n is calculated by the following formula (II): ΔV n = V n - V p ’ (II) Among them, V p ’ 为 The pixel voltage V of N said second regions pixel Average value, V n Is the pixel voltage V of the nth said second region pixel Value.

4. The brightness adjustment method according to claim 1, characterized in that, Before partitioning the current display screen into M first regions according to the distribution state of the common voltage V com in the current display screen, the method further includes: Detecting the ambient light brightness at different positions of the current display screen; Querying a pre-stored correspondence table to determine the voltage compensation values at different positions, the correspondence table including the correspondence between the ambient light brightness and the voltage compensation values; Determine the voltage distribution state of the common voltage V com and the pixel electrode V pixel in the current display screen according to the relationship between the voltage compensation values at different positions on the current display screen and the corresponding positions.

5. The brightness adjustment method according to claim 4, characterized in that, Before querying the pre-stored correspondence table, the method further includes the step of obtaining the correspondence table, specifically including: Detecting the ambient light brightness at different positions of the test display screen; Calculating the average value of the ambient light brightness of the test display screen as the brightness standard; Calculating the difference between the ambient light brightness at different positions on the test display screen and the brightness standard, and determining the voltage compensation value corresponding to each ambient light brightness according to the difference to obtain the correspondence table.

6. The brightness adjustment method according to claim 5, characterized in that, The detecting the ambient light brightness at different positions of the test display screen specifically includes: Dividing the test display screen into a plurality of sub-regions arranged in an array of L rows and D columns, where L and D are both positive integers greater than or equal to 1; Arranging photosensitive sensors in the outermost first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region among the plurality of sub-regions arranged in an array to obtain the ambient light brightness at different positions of the test display screen; and / or The detecting the ambient light brightness at different positions of the current display screen specifically includes: Dividing the current display screen into a plurality of sub-regions arranged in an array of L rows and D columns, where L and D are both positive integers greater than or equal to 1; Arranging photosensitive sensors in the outermost first row sub-region, the L-th row sub-region, the first column sub-region, and the D-th column sub-region among the plurality of sub-regions arranged in an array to obtain the ambient light brightness at different positions of the current display screen.

7. A brightness adjustment device, characterized in that, comprising: The first partition module is used to partition the current display screen into M first regions according to the distribution state of the common voltage V com in the current display screen, where the difference between the common voltages V com of different first regions is greater than a first threshold, and M is an integer greater than 1; The second partition module is used to partition the current display screen into N second regions according to the distribution state of the pixel voltage V pixel in the current display screen, where the difference between the pixel voltages V pixel in different second regions is greater than a second threshold, and N is an integer greater than 1; The first calculation module is configured to calculate the voltage compensation values within each of the first regions, where the voltage compensation value of the m-th first region is ΔV m , and m is an integer between 1 and M; A second calculation module, configured to calculate a voltage compensation value for each of the second regions, where the voltage compensation value for the nth second region is ΔV n , where n is an integer between 1 and N; A third partitioning module for overlapping the M first regions and the N second regions to obtain M×N adjustment regions; A third calculation module, configured to calculate Gamma voltage values of each of the adjustment regions at different gray levels, so as to obtain a set of Gamma data for M×N adjustment regions, where the Gamma voltage value of the adjustment region obtained by overlapping the m-th first region and the n-th second region is V+ΔV m +ΔV n , where V is the gray level voltage at the current gray level; A driving module for driving the display module to perform display according to the Gamma data.

8. The brightness adjustment device according to claim 7, characterized in that, The first calculation module specifically calculates the common voltage compensation value ΔV of the m-th first region according to the following formula (I) m : ΔV m = V m - V p (I) Among them, V p为 The common voltage V of the M first regions com Average value; V m Is the common voltage V of the m-th first region com Value.

9. The brightness adjustment device according to claim 7, characterized in that, The second calculation module is specifically configured to calculate the pixel voltage compensation value ΔV of the nth second region according to the following formula (II) n :[[]]END]] ΔV n = V n - V p ’ (II) Among them, V p ’ 为 The pixel voltage V of N of the second regions pixel average value, V n is the pixel voltage V of the nth of the second regions pixel value.

10. The brightness adjustment device according to claim 7, characterized in that, The brightness adjustment device further includes: A photosensitive sensor for detecting the ambient light brightness at different positions of the current display screen; A query module for querying a pre-stored correspondence table to determine the voltage compensation values at different positions, the correspondence table including the correspondence between the ambient light brightness and the voltage compensation values; A determining module, configured to determine a voltage distribution state of a common voltage V com and a pixel electrode V pixel in the current display screen according to a relationship between voltage compensation values at different positions on the current display screen and the corresponding positions.

11. The brightness adjustment device according to claim 10, wherein, the brightness adjustment device further comprises: an acquisition module for acquiring the correspondence table, and the acquisition module specifically comprises: a receiving unit for testing the ambient light brightness at different positions of the display screen; a first calculation unit for calculating the average value of the ambient light brightness of the tested display screen as the brightness standard; a second calculation unit for calculating the difference between the ambient light brightness at different positions on the tested display screen and the brightness standard; a data processing unit for determining the voltage compensation value corresponding to each ambient light brightness according to the difference to obtain the correspondence table.

12. The brightness adjustment device according to claim 10, wherein, the photosensitive sensor is integrated on the display module, and the display screen of the display module is divided into a plurality of sub-regions arranged in an L-row and D-column array, and both L and D are positive integers greater than or equal to 1; the photosensitive sensor is arranged in the first row sub-region, the L-th row sub-region, the first column sub-region and the D-th column sub-region located on the periphery among the plurality of sub-regions arranged in an array.

13. A display device, wherein, it comprises the brightness adjustment device according to any one of claims 7 to 12.

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