Display panel brightness adjustment method and device

Abstract

The application discloses a display panel brightness adjusting method and device, wherein the brightness adjusting method comprises the following steps: obtaining a first display voltage required by a display pixel in a first display area when the display pixel displays a to-be-displayed gray scale; determining a second display voltage corresponding to a display pixel in a second display area based on a voltage mapping relationship when the brightness of the first display area and the second display area is the same and the first display voltage; and determining a target gray scale of the display pixel in the second display area based on the second display voltage. The application adjusts the pixel voltage of the second display area based on the first display area by calling the voltage mapping relationship of the first display area and the second display area, so as to calculate the adjusted gray scale, and makes the brightness of the first display area and the second display area consistent.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a method and apparatus for adjusting the brightness of a display panel. Background Technology

[0002] The latest developments in under-display camera (UDC) systems provide a truly borderless and notch-free full-screen viewing experience for smart devices such as mobile phones, TVs, laptops, and tablets.

[0003] Currently, the display effect of display panels using under-display cameras (UDC) is unsatisfactory. Therefore, many UDC display panel manufacturers adopt the practice of keeping the pixel density of different display areas consistent in order to avoid the "screen door effect". However, due to the inconsistent aperture ratio of different display areas, there are problems such as different brightness in different display areas. Summary of the Invention

[0004] This application provides a method and apparatus for adjusting the brightness of a display panel to solve the technical problem of the difference in brightness between the first display area and the second display area when the display panel displays a pure image.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a method for adjusting the brightness of a display panel, wherein the display panel includes a first display area and a second display area, and the brightness adjustment method includes:

[0006] Obtain the first display voltage required for the display pixels in the first display area to display the grayscale to be displayed;

[0007] Based on the voltage mapping relationship when the brightness of the first and second display areas is the same, and the first display voltage, the second display voltage corresponding to the display pixels in the second display area is determined;

[0008] The target grayscale of the display pixels in the second display area is determined based on the second display voltage.

[0009] In one embodiment, the step of determining the second display voltage corresponding to the display pixels in the second display area based on the voltage mapping relationship when the brightness of the first display area and the second display area is the same and the first display voltage includes:

[0010] Based on the voltage mapping relationship when the brightness of the first display area and the second display area are the same, as well as the ratio of the luminous efficiency of the first display area and the second display area and the first display voltage, the second display voltage corresponding to the display pixels in the second display area is determined.

[0011] In one embodiment, determining the second display voltage corresponding to the display pixels in the second display area, based on the voltage mapping relationship when the brightness of the first display area and the second display area is the same, and the luminous efficiency ratio of the first display area and the second display area and the first display voltage, includes:

[0012] Based on the first voltage-current mapping relationship of the display pixels in the first display area and the first display voltage, the first current of the display pixels in the first display area is determined;

[0013] The second current of the display pixels in the second display area is determined based on the first current and the ratio of the luminous efficiency of the first display area to that of the second display area.

[0014] Based on the second voltage-current mapping relationship and the second current of the display pixels in the second display area, the second display voltage corresponding to the display pixels in the second display area is determined.

[0015] In one embodiment, the voltage mapping relationship when the brightness of the first display area and the second display area is the same satisfies the following formula (1). The second display voltage is determined according to formula (1), which is:

[0016] (1)

[0017] Where gain is the adjustment coefficient, V1 is the first display voltage, V2 is the second display voltage, a1 is the peak value of the highest point in the first voltage-current mapping relationship, b1 is the abscissa corresponding to the peak value in the first voltage-current mapping relationship, c1 is the standard deviation in the first voltage-current mapping relationship, a2 is the peak value of the highest point in the second voltage-current mapping relationship, b2 is the abscissa corresponding to the peak value in the second voltage-current mapping relationship, and c2 is the standard deviation in the second voltage-current mapping relationship.

[0018] Preferably, the adjustment coefficient is the ratio of the luminous efficiency of the first display area to that of the second display area.

[0019] In one embodiment, the step of determining the target grayscale of a display pixel in the second display area based on a second display voltage includes:

[0020] The register value corresponding to the second display voltage in the second display area is determined according to formula (2), which is:

[0021] (2)

[0022] Where Bgl2 is the register value corresponding to the second display voltage; V2 is the second display voltage; n is the number of bits in the register corresponding to the second display area; Vgsp is the minimum voltage value of the display pixel in the second display area; and Vgmp is the maximum voltage value of the display pixel in the second display area.

[0023] The target grayscale of the display pixels in the second display area is determined based on the register value corresponding to the second display voltage.

[0024] In one embodiment, the brightness adjustment method further includes:

[0025] Determine the position of the image pixels in the pure grayscale image that correspond to the first and second display areas of the display panel;

[0026] Replace the grayscale to be displayed of the image pixels in the image that correspond to the second display area with the target grayscale;

[0027] In one embodiment, the step of determining the position of image pixels in a pure grayscale image corresponding to the first and second display areas of the display panel includes:

[0028] Based on the actual size of the first display area and the pixel resolution of the image, obtain the physical distance per unit pixel of the image;

[0029] Based on the physical distance per unit pixel in the image, the actual distance from the boundary of the second display area to the boundary of the first display area, and the actual radius of the second display area, the coordinates of the center of the second display area in the image and the number of pixels occupied by the radius of the second display area in the image are obtained.

[0030] In one embodiment, obtaining the first display voltage required for the display pixels in the first display area to display the grayscale to be displayed includes:

[0031] In response to the grayscale to be displayed being a bound point grayscale, the bound point voltage corresponding to the bound point grayscale is used as the first display voltage;

[0032] In response to the grayscale to be displayed being a non-binding grayscale, the first binding grayscale and the second binding grayscale closest to the grayscale to be displayed are obtained, and the first display voltage is obtained based on the first binding voltage corresponding to the first binding grayscale and the second binding voltage corresponding to the second binding grayscale; wherein, the first binding grayscale is smaller than the grayscale to be displayed, and the grayscale to be displayed is smaller than the second binding grayscale.

[0033] In one embodiment, in response to the displayed grayscale being a bound-point grayscale, the bound-point voltage corresponding to the bound-point grayscale is used as the first display voltage, including:

[0034] The binding point voltage corresponding to the gray level of the binding point is determined according to formula (3), which is:

[0035] (3)

[0036] Where Bgl is the register value corresponding to the grayscale to be displayed; V1 is the first display voltage; n is the number of bits in the register corresponding to the first display area; Vgsp is the minimum voltage value of the displayed pixel in the first display area; and Vgmp is the maximum voltage value of the displayed pixel in the first display area.

[0037] In one embodiment, obtaining a first display voltage based on a first binding point voltage corresponding to a first binding point grayscale and a second binding point voltage corresponding to a second binding point grayscale includes:

[0038] The voltage of the first binding point corresponding to the gray level of the first binding point is determined according to formula (4), which is:

[0039]

[0040] Wherein, Bgl01 is the register value corresponding to the grayscale of the first binding point, n is the number of bits of the register corresponding to the first display area, Vgsp is the minimum voltage value of the displayed pixel in the first display area, and Vgmp is the maximum voltage value of the displayed pixel in the first display area.

[0041] The voltage at the second binding point corresponding to the grayscale of the second binding point is determined according to formula (5), which is:

[0042]

[0043] Wherein, Bgl02 is the register value corresponding to the grayscale of the second binding point;

[0044] The first display voltage is determined according to formula (6), which is:

[0045] (6)

[0046] Where Bgl is the register value corresponding to the grayscale to be displayed.

[0047] In one embodiment, the transmittance of the first display area is less than that of the second display area.

[0048] To solve the above-mentioned technical problems, another technical solution adopted in this application is: providing a display panel brightness adjustment device, wherein the display panel includes a first display area and a second display area, and the display panel brightness adjustment device includes:

[0049] The first voltage determination module is used to obtain the first display voltage required when the display pixels in the first display area display the grayscale to be displayed.

[0050] The second voltage determination module is used to determine the second display voltage corresponding to the display pixels in the second display area based on the voltage mapping relationship when the brightness of the first display area and the second display area are the same and the first display voltage.

[0051] The target grayscale determination module is used to determine the target grayscale of the display pixels in the second display area based on the second display voltage.

[0052] The beneficial effects of this application are as follows: This application obtains the first display voltage required for the display pixels in the first display area to display the grayscale to be displayed. Based on the voltage mapping relationship when the brightness of the first and second display areas is the same and the first display voltage, it determines the second display voltage corresponding to the display pixels in the second display area. Based on the second display voltage, it determines the target grayscale of the display pixels in the second display area. Using the first display area as a reference, the pixel voltage of the second display area is adjusted, thereby calculating the adjusted target grayscale of the second display area. This avoids the phenomenon of uneven brightness when the main screen area and the secondary screen area display a pure grayscale image using the same grayscale, achieving the effect of consistent brightness between the first and second display areas. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0054] Figure 1 This is a flowchart of one embodiment of the display panel brightness adjustment method of this application;

[0055] Figure 2 This is a schematic diagram of the structure of one embodiment of the display panel of this application;

[0056] Figure 3 This is a flowchart illustrating another embodiment of the display panel brightness adjustment method in this application;

[0057] Figure 4 For this application Figure 3 A flowchart of one embodiment corresponding to step S4;

[0058] Figure 5 For this application Figure 1 A flowchart of one embodiment corresponding to step S1;

[0059] Figure 6 For this application Figure 1 A flowchart of one embodiment corresponding to step S2;

[0060] Figure 7 This is a schematic diagram of the voltage-current relationship fitting curve of the display pixels in the first display area / second display area in this application;

[0061] Figure 8 For this application Figure 1 A flowchart of one embodiment corresponding to step S3;

[0062] Figure 9 This application presents a schematic diagram of one embodiment of the display panel brightness adjustment device. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0064] Please see Figure 1 , Figure 1 This is a flowchart illustrating one embodiment of the display panel brightness adjustment method of this application. This application provides a display panel brightness adjustment method, the display panel including a first display area and a second display area, the steps of which include:

[0065] S1: Obtain the first display voltage required for the display pixels in the first display area to display the grayscale to be displayed.

[0066] The first display voltage can be a driving voltage that drives the display pixels in the first display area to emit light, such as a data signal on a data line connected to the display pixels in the first display area. The first display voltage is determined based on the grayscale value of the display pixels in the first display area AA1, where there is a correspondence between the grayscale value and the voltage value; the corresponding voltage value can be derived from the grayscale value. The first display area AA1 can be the main screen area.

[0067] S2: Based on the voltage mapping relationship when the brightness of the first display area and the second display area are the same, and the first display voltage, determine the second display voltage corresponding to the display pixels in the second display area.

[0068] The second display voltage can be a driving voltage that drives the display pixels in the second display area to emit light, such as a data signal on a data line connected to the display pixels in the second display area. The voltage mapping relationship when the brightness of the first display area AA1 and the second display area AA2 is the same can be obtained in advance through experiments, so that the second display voltage of the display pixels in the second display area AA2 can be derived based on the first display voltage determined in step S1. For example, the pixel structure in the first display area AA1 differs from that in the second display area AA2 (e.g., differences in pixel density, scan line length, pixel driving circuit structure, etc.), resulting in differences in the display characteristics of the first display area AA1 and the second display area AA2. The second display area AA2 can be a sub-screen area used to integrate photosensitive elements, such as a camera.

[0069] S3: Determine the target grayscale of the display pixels in the second display area based on the second display voltage.

[0070] Based on the grayscale-voltage correspondence of the second display area AA2, after obtaining the second display voltage, the target grayscale value corresponding to the display pixels in the second display area AA2 can be determined according to this correspondence. Then, the grayscale values ​​corresponding to the second display area AA2 in the data of the pure grayscale image to be displayed are reassigned, so that the display brightness of the second display area AA2 is consistent with that of the first display area AA1 under pure grayscale display. The brightness of the first display area AA1 using the first display voltage corresponding to the grayscale to be displayed is consistent with the brightness of the second display area AA2 using the second display voltage corresponding to the target grayscale. Using the first display area AA1 as a reference, the pixel voltage of the second display area AA2 is adjusted to calculate the target grayscale of the adjusted second display area, thus avoiding uneven brightness when the main screen area and the secondary screen area display a pure grayscale image using the same grayscale.

[0071] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of one embodiment of the display panel of this application; Figure 3 This is a flowchart illustrating another embodiment of the display panel brightness adjustment method in this application; the display panel brightness adjustment method in this application embodiment further includes:

[0072] S4. Determine the position of the image pixel in the pure grayscale image that corresponds to the second display area AA2 of the display panel.

[0073] S5. Replace the grayscale to be displayed of the image pixels corresponding to the second display area AA2 in the image with the target grayscale.

[0074] The target image data is generated by replacing the grayscale to be displayed (equivalent to the original grayscale) of the image pixels corresponding to the second display area AA2 in the original image with the target grayscale, thereby driving the display panel to display. Optionally, step S4 can be before step S1, after step S3, or between steps S1 and S3, as needed. The grayscale of the image pixels corresponding to the first display area AA1 remains unchanged and is still the original grayscale.

[0075] The display panel may include a first display area AA1 and a second display area AA2. The second display area AA2 may be located within the first display area AA1, that is, the first display area AA1 is arranged around the periphery of the second display area AA2. Optionally, in this embodiment, the position of the second display area AA2 is used to correspond to the position of optical components such as cameras. Preferably, the light transmittance of the second display area AA2 is greater than that of the first display area AA1. Since the light transmittance of the second display area AA2 is greater than that of the first display area AA1, in the prior art, when the display panel displays a pure grayscale image, there are problems such as different brightness between the first display area AA1 and the second display area AA2, and poor selfie effect. Specifically, this step is implemented as follows: based on the relative positional relationship of the first display area AA1 and the second display area AA2 in the design stage, the boundary between the first display area AA1 and the second display area AA2 is determined, and the determination result is saved. When compensating for the display pixels in the second display area AA2, the compensation effect can be stabilized by accurately compensating the display pixels located in the second display area AA2 whose positions have been confirmed.

[0076] Please see Figure 4 , Figure 4 For this application Figure 3 A flowchart illustrating one embodiment of step S4; in one embodiment, step S4, determining the position of the image pixel corresponding to the second display area in the pure grayscale image, includes:

[0077] S41: Based on the actual size of the first display area and the pixel resolution of the image, obtain the physical distance per unit pixel in the image.

[0078] For example, the height of the entire display area formed by the first display area AA1 and the second display area AA2 of the display panel is h, and the width is w. The resolution of the display pixels of the display panel is H*W. In this case, the physical distance per pixel is p=h / H or p=w / W. In this embodiment, the physical distance is chosen to be p=h / H. The display pixels within the entire display area formed by the first display area AA1 and the second display area AA2 correspond to the pixels in the image to be displayed (i.e., image data).

[0079] S42: Based on the physical distance per unit pixel in the image, the actual distance from the boundary of the second display area to the boundary of the first display area, and the actual radius of the second display area, obtain the coordinate position of the center of the second display area in the image and the number of pixels occupied by the radius of the second display area in the image.

[0080] Specifically, this step can be performed by calculating the pixel position of the center of the second display area AA2 in the image by calculating the pixel position of the boundary of the second display area AA2 in the image.

[0081] For example, please refer to [the document / reference]. Figure 1 When the second display area AA2 is circular, its actual radius R can be directly measured. The actual distances from the top, bottom, left, and right boundaries of the second display area AA2 to the top, bottom, left, and right boundaries of the first display area AA1 are h1, h2, h3, and h4, respectively. In other embodiments, when the second display area AA2 is not circular, a fitted circle of the second display area AA2 can be obtained in advance, thereby obtaining its actual radius R. Using h1, h2, h3, and h4, the coordinate positions x1, x2, x3, and x4 of the top, bottom, left, and right boundaries of the second display area AA2 in the corresponding image can be calculated, where x1 = ... x2= x3= x4= Specifically, the coordinates of pixel R1 (Rx, Ry) in the image corresponding to the center of the circular second display area AA2 are obtained by connecting the outer rectangular regions of the second display area AA2. The formulas for calculating Rx and Ry are as follows:

[0082] Rx= Ry= (8)

[0083] The position of the center pixel of the second display area AA2 can be calculated using the above formula (8). The length and width of the outer rectangular area of ​​the second display area AA2 are parallel to the two coordinate axes, and a coordinate system is established with the upper left corner as the origin.

[0084] Based on the coordinates of the center of the second display area in the image and the number of pixels occupied by the radius of the second display area in the image, the position of the image pixel corresponding to the second display area in the pure grayscale image can be obtained.

[0085] Specifically, this step uses the image pixel corresponding to the center of the second display area AA2 as the center, and then scans a circle with the number of pixels occupied by the radius of the second display area AA2 in the image to obtain the pixel corresponding to the second display area AA2 in the image. The remaining image pixels are the pixels corresponding to the first display area AA1 in the image.

[0086] In detail, if the radius of the second display area AA2 is R, then the pixel distance of the radius of the second display area AA2 can be calculated as Pr = R / p based on the physical distance of a unit pixel as p. At this time, a circle can be drawn in the image with R1 (Rx, Ry) as the center and Pr as the radius. The pixels within this circle are the pixels of the second display area AA2, and the remaining pixels are the pixels of the first display area AA1.

[0087] Then, the pixel positions corresponding to the first display area AA1 and the pixel positions corresponding to the second display area AA2 are simultaneously saved to the memory.

[0088] This application obtains the dimensions of the first display area AA1 and the second display area AA2 in the display panel and the resolution of the image to be displayed, calculates and determines the image pixel positions corresponding to the first display area AA1 and the second display area AA2, then obtains the first display voltage of the first display area AA1 through steps S1-S3, then retrieves the voltage mapping relationship when the brightness of the first display area AA1 and the second display area AA2 is the same, adjusts the second display voltage of the second display area AA2 based on the voltage of the first display area AA1 to calculate the target grayscale, replaces the original grayscale value of the image pixel corresponding to the second display area AA2 in the original image, obtains the target image data, and outputs the target image data to the display panel so that the brightness of the adjusted second display area AA2 and the first display area AA1 is consistent.

[0089] Please see Figure 5 , Figure 5 For this application Figure 1 A flowchart of an embodiment corresponding to step S1; Step S1 of the brightness adjustment method in this application: obtaining the first display voltage required for the display pixels in the first display area to display the grayscale to be displayed, includes:

[0090] S11: Determine whether the grayscale to be displayed is a bound-point grayscale or is between two bound-point grayscales;

[0091] This step determines whether the grayscale to be displayed is a bound-point grayscale. If it is a bound-point grayscale, proceed to step S12; otherwise, proceed to step S13.

[0092] S12: In response to the grayscale to be displayed being a bound point grayscale, the bound point voltage corresponding to the bound point grayscale is used as the first display voltage;

[0093] In response to the grayscale to be displayed being a bound-point grayscale, i.e., when the grayscale to be displayed is the same as the bound-point grayscale, the bound-point voltage corresponding to the bound-point grayscale is used as the first display voltage V1. Specifically, the above step S12 includes: determining the bound-point voltage corresponding to the bound-point grayscale according to formula (3), where formula (3) is:

[0094] (3)

[0095] Wherein, Bgl is the register value corresponding to the grayscale to be displayed; n is the number of bits in the register corresponding to the first display area; Vgsp is the minimum voltage value driving the display pixels in the first display area; and Vgmp is the maximum voltage value driving the display pixels in the first display area. In one embodiment, when driving the display panel, the lowest driving voltage is 1V, and the highest driving voltage is 7.2V, where both Vgmp and Vgsp are within the range of 1~7.2V, and the voltage value of Vgmp is greater than the voltage value of Vgsp. The register value corresponding to the bound grayscale can be obtained by looking up a table or other means. The correspondence between the bound grayscale and the register value, as well as the correspondence between the bound grayscale and the display voltage, can be obtained in advance by performing gamma adjustment on the first display area, and this correspondence can be stored.

[0096] S13: In response to the grayscale to be displayed being a non-binding grayscale, obtain the first binding grayscale and the second binding grayscale that are closest to the grayscale to be displayed, and obtain the first display voltage based on the first binding voltage corresponding to the first binding grayscale and the second binding voltage corresponding to the second binding grayscale; wherein, the first binding grayscale is smaller than the grayscale to be displayed, and the grayscale to be displayed is smaller than the second binding grayscale.

[0097] In response to the grayscale to be displayed being located between two binding point grayscales, i.e., the grayscale to be displayed is different from the binding point grayscale, the binding point voltages corresponding to the two binding point grayscales are determined respectively, and the first display voltage is determined based on the binding point voltages corresponding to the two binding point grayscales.

[0098] The first display voltage is obtained based on the first binding point voltage corresponding to the first binding point grayscale and the second binding point voltage corresponding to the second binding point grayscale. This step includes:

[0099] The voltage of the first binding point corresponding to the gray level of the first binding point is determined according to formula (4), which is:

[0100]

[0101] Wherein, Bgl01 is the register value corresponding to the grayscale of the first binding point, n is the number of bits of the register corresponding to the first display area, Vgsp is the minimum voltage value of the displayed pixel in the first display area, and Vgmp is the maximum voltage value of the displayed pixel in the first display area. This is the voltage at the first binding point.

[0102] The voltage at the second binding point corresponding to the grayscale of the second binding point is determined according to formula (5), which is:

[0103]

[0104] Wherein, Bgl02 is the register value corresponding to the grayscale of the second binding point; This is the voltage at the second binding point;

[0105] The first display voltage is determined according to formula (6), which is:

[0106] (6)

[0107] Where Bgl is the register value corresponding to the grayscale to be displayed.

[0108] In one embodiment, when the grayscale to be displayed is a bound point grayscale, the bound point voltage corresponding to the bound point grayscale is taken as the first display voltage V1, and the first display voltage can be calculated according to formula (3); when the grayscale to be displayed is not the same as the bound point grayscale, the first bound point grayscale and the second bound point grayscale closest to the grayscale to be displayed are determined, the bound point voltages corresponding to the two bound point grayscales are determined respectively, and the first display voltage is determined according to the bound point voltages corresponding to the two bound point grayscales, and the first display voltage can be calculated according to formulas (4), (5) and (6). Through step S1, the first display voltage corresponding to the first display area AA1 under the grayscale to be displayed can be determined.

[0109] Optionally, step S2 includes: determining the second display voltage corresponding to the display pixels in the second display area based on the voltage mapping relationship when the brightness of the first display area and the second display area are the same, as well as the luminous efficiency ratio of the first display area and the second display area and the first display voltage.

[0110] Because the first and second display areas have different structures, their luminous efficiencies differ, resulting in inconsistent brightness under the same display voltage calculated for the same grayscale. Based on the ratio of the luminous efficiencies of the first and second display areas and the first display voltage, the second display voltage is adjusted to ensure that the first and second display areas achieve consistent brightness under the corresponding display voltage.

[0111] Before step S2, a voltage mapping relationship between the display pixels in the first display area AA1 and the second display area AA2 when the brightness is the same can be established in advance. Then, the first display voltage is calculated in combination with step S1, and the second display voltage corresponding to the display pixels in the second display area is determined.

[0112] Please see Figure 6 , Figure 6 For this application Figure 1 A flowchart illustrating one embodiment corresponding to step S2; step S2 includes:

[0113] S21: Based on the first voltage-current mapping relationship of the display pixels in the first display area and the first display voltage, determine the first current of the display pixels in the first display area.

[0114] The first current can be the driving current that drives the display pixels in the first display area to emit light, that is, the driving current flowing through the light-emitting elements in the display pixels of the first display area. A first voltage-current mapping relationship between the first voltage and the first current of the display pixels in the first display area can be established in advance through experiments, so that the first current can be calculated in step S21. In the first display area AA1, there is a corresponding relationship between the first voltage and the first current of the display pixels, that is, a first voltage-current mapping relationship. The steps for establishing the first voltage-current mapping relationship in advance include:

[0115] The first current of the display pixels in the first display area under multiple first voltages can be obtained in advance through testing, etc.; Gaussian fitting is performed on the multiple first voltages and first currents to obtain the first voltage-current mapping relationship.

[0116] For the display pixels in the first display area AA1, multiple sets of first voltage and first current tests are performed, and Gaussian fitting is performed on the first voltage and first current based on the test results to obtain the first voltage-current mapping relationship of the first voltage and first current in the first display area AA1.

[0117] For example, the first voltage-current mapping relationship can be as follows: Since a1, b1, and c1 are known parameters, the first displayed voltage V1 is substituted into them. Thus, the first current I1 can be obtained.

[0118] S22: Determine the second current of the display pixels in the second display area based on the first current and the ratio of the luminous efficiency of the first display area and the second display area.

[0119] The second current can be the driving current that drives the display pixels in the second display area to emit light, that is, the driving current flowing through the light-emitting elements in the display pixels of the second display area. In the first display area AA1, the first brightness is proportional to the first current, and the ratio of the first brightness to the first current is the first luminous efficiency, i.e., L1 = η1 × I1, where L1 is the first brightness, η1 is the first luminous efficiency, and I1 is the first current. In the second display area AA2, the second brightness is proportional to the second current, and the ratio of the second brightness to the second current is the second luminous efficiency, i.e., L2 = η2 × I2, where L2 is the second brightness, η2 is the second luminous efficiency, and I2 is the second current. When the first brightness and the second brightness are the same, i.e., L1=L2, we can derive η1×I1=η2×I2, and further, η1 / η2=I2 / I1, where η1 / η2 is the ratio of the first luminous efficiency of the first display area to the second luminous efficiency of the second display area, and I2 / I1 is the ratio of the second current of the second display area to the first current of the first display area. From the above formula, we can deduce that the ratio of the first luminous efficiency to the second luminous efficiency is equal to the ratio of the second current to the first current. Therefore, the second current I2=(η1 / η2)I1.

[0120] S23: Based on the second voltage-current mapping relationship and the second current of the display pixels in the second display area, determine the second display voltage corresponding to the display pixels in the second display area.

[0121] A second voltage-current mapping relationship between the second voltage and the corresponding second current of the display pixels in the second display area can be established in advance through experiments; this will facilitate the subsequent calculation of the second display voltage in step S23. In the second display area AA2, there is a corresponding relationship between the second voltage and the second current of the display pixels, i.e., a second voltage-current mapping relationship. The steps for establishing this second voltage-current mapping relationship in advance include:

[0122] The second current of the display pixels in the second display area under multiple second voltages can be obtained through testing and other means; Gaussian fitting is performed on the multiple second voltages and second currents to obtain the second voltage-current mapping relationship.

[0123] For the display pixels in the second display area AA2, multiple sets of second voltage and second current tests were performed, and Gaussian fitting was performed on the second voltage and second current based on the test results to obtain the second voltage-current mapping relationship of the second voltage and second current in the second display area AA2.

[0124] For example, the second voltage-current mapping relationship can be as follows: Since a2, b2, and c2 are known parameters, the second current I2 is substituted into the equation. The second display voltage V2 can be derived from this.

[0125] The first voltage-current mapping relationship and the second voltage-current mapping relationship are described in detail below. Please refer to [link / reference]. Figure 7 , Figure 7 This is a schematic diagram of the voltage-current relationship fitting curve of the display pixels in the first display area / second display area in this application; optionally, the first voltage-current mapping relationship and the second voltage-current mapping relationship satisfy the following formula (7), formula (7) is:

[0126] (7)

[0127] Where a is the peak value of the Gaussian fitting curve, b is the abscissa corresponding to the peak value, and c is the standard deviation of the Gaussian fitting curve. I is the current of the display pixels in the first display area / second display area, and V is the voltage of the display pixels in the first display area / second display area. In one embodiment, the fitting relationship in the first and second display areas is consistent, and the corresponding Gaussian curves are consistent, that is, the values ​​of the peak value a, the abscissa b, and the standard deviation c of the Gaussian fitting curve are consistent. a, b, and c can be known parameters.

[0128] In another embodiment, the fitting relationships in the first display area and the second display area are inconsistent, and the corresponding Gaussian curves are inconsistent; that is, the peak value 'a', the corresponding abscissa 'b', and the standard deviation 'c' of the Gaussian fitting curve are inconsistent. Furthermore, the peak value 'a', the corresponding abscissa 'b', and the standard deviation 'c' of the Gaussian fitting curve can be obtained from both the first and second voltage-current mapping relationships. For example, the first voltage-current mapping relationship is... The second voltage-current mapping relationship is as follows: .in, , , The parameters can be known. and They can be different. They can be different. and Meanwhile, the first voltage-current mapping relationship determines the correspondence between the first current and the first voltage in the first display area, and the second voltage-current mapping relationship determines the correspondence between the second current and the second voltage in the second display area AA2, preparing for subsequent calculations.

[0129] Because in the existing technology, when the same grayscale is used to light up the display panel, the brightness of the first display area AA1 and the second display area AA2 are different. In order to achieve the same brightness, assuming that the first brightness of the first display area AA1 and the second brightness of the second display area AA2 are the same, the relationship between the display parameters in the first display area AA1 and the second display area AA2 is obtained. Then, combined with the first voltage-current mapping relationship and the second voltage-current mapping relationship, the voltage mapping relationship when the brightness of the first display area AA1 and the second display area AA2 are the same is obtained.

[0130] Based on the first voltage-current mapping relationship and the second voltage-current mapping relationship, the voltage mapping relationship between the first display area AA1 and the second display area AA2 is obtained when the first brightness and the second brightness are the same.

[0131] In one embodiment, when the first voltage-current mapping relationship and the second voltage-current mapping relationship of the first display area AA1 and the second display area AA2 are inconsistent, the voltage mapping relationship when the brightness of the first display area and the second display area are the same satisfies the following formula (1), which is:

[0132] The second display voltage is determined according to formula (1):

[0133] (1)

[0134] Where gain is the adjustment coefficient, V1 is the first display voltage, V2 is the second display voltage, a1 is the peak value of the highest point in the first voltage-current mapping relationship, b1 is the abscissa corresponding to the peak value in the first voltage-current mapping relationship, c1 is the standard deviation in the first voltage-current mapping relationship, a2 is the peak value of the highest point in the second voltage-current mapping relationship, b2 is the abscissa corresponding to the peak value in the second voltage-current mapping relationship, and c2 is the standard deviation in the second voltage-current mapping relationship. The adjustment coefficient gain = η1 / η2. When the brightness of the first display area AA1 and the second display area AA2 is the same, we can obtain η1∙I1 = η2∙I2. Therefore, the relationship between the adjustment coefficient and the first and second currents can be obtained as: gain = η1 / η2. 2= I2 / I1.

[0135] Formula (1) above can be obtained by combining the adjustment coefficient with the first voltage-current mapping relationship and the second voltage-current mapping relationship. The first voltage-current mapping relationship is: The second voltage-current mapping relationship is as follows: The adjustment coefficient gain = I2 / I1, therefore the above formula (1) can be obtained.

[0136] In one embodiment, when the first voltage-current mapping relationship of the first display area AA1 and the second voltage-current mapping relationship of the second display area AA2 are consistent, the peak value 'a' of the highest point of the Gaussian fitting curve, the abscissa 'b' corresponding to the peak value, and the standard deviation 'c' of the Gaussian fitting curve are... The following formula:

[0137] +b (8)

[0138] According to the above formula (8), the second display voltage can be determined when the first voltage-current mapping relationship of the first display area AA1 and the second voltage-current mapping relationship of the second display area AA2 are consistent. This is equivalent to a1=a2=a, b1=b2=b, c1=c2=c in formula (1), which is simplified to obtain formula (8).

[0139] Please see Figure 8 , Figure 8 For this application Figure 1 A flowchart of one embodiment corresponding to step S3; optionally, based on the second display voltage, the target grayscale of the display pixels in the second display area AA2 is determined, and this step S3 includes:

[0140] S31: Determine the register value of the second display area according to formula (2), which is:

[0141] (2)

[0142] Where Bgl2 is the register value corresponding to the second display voltage; n is the number of bits in the register corresponding to the second display area; Vgsp is the minimum voltage value of the display pixel in the second display area; and Vgmp is the maximum voltage value of the display pixel in the second display area.

[0143] S32: Determine the target grayscale of the display pixels in the second display area based on the register value corresponding to the second display voltage.

[0144] Based on the correspondence between the grayscale of the second display area AA2 and the register value, determine the grayscale corresponding to the current register value, i.e., the target grayscale.

[0145] Based on the second display voltage, the target grayscale value required for the display pixels in the second display area AA2 is determined, achieving the effect that the display brightness reference of the first display area AA1 and the second display area AA2 is consistent. The correspondence between the grayscale values ​​and register values ​​of the second display area, as well as the correspondence between the grayscale values ​​and the display voltage, can be obtained in advance by performing gamma adjustments on the second display area, and this correspondence can be stored.

[0146] Please see Figure 9 , Figure 9This is a schematic diagram of one embodiment of the display panel brightness adjustment device of this application. The display panel brightness adjustment device provided in this application can be used to execute the display panel brightness adjustment method provided in this application. The display panel brightness adjustment device provided in this application can be implemented by hardware and / or software. This application also provides a display panel brightness adjustment device 10, the display panel includes a first display area AA1 and a second display area AA2, and the display panel brightness adjustment device 10 includes: a first voltage determination module 11, a second voltage determination module 12, and a target grayscale determination module 13.

[0147] The first voltage determination module 11 is used to obtain the first display voltage required for the display pixels in the first display area AA1 to display the grayscale to be displayed.

[0148] The second voltage determination module 12 is used to determine the second display voltage corresponding to the display pixels in the second display area AA2 based on the voltage mapping relationship when the brightness of the first display area AA1 and the second display area AA2 is the same and the first display voltage.

[0149] The target grayscale determination module 13 is used to determine the target grayscale of the display pixels in the second display area AA2 based on the second display voltage.

[0150] The display panel brightness adjustment device provided in this application can be used to execute the display panel brightness adjustment method provided in this application, and has the beneficial effects provided by the above embodiments, which will not be repeated here.

[0151] Optionally, the second voltage determination module 12 is used to: determine the second display voltage corresponding to the display pixels in the second display area AA2 based on the voltage mapping relationship when the brightness of the first display area AA1 and the second display area AA2 is the same, as well as the ratio of the luminous efficiency of the first display area AA1 and the second display area AA2 and the first display voltage.

[0152] Optionally, the second voltage determination module 12 includes:

[0153] The first current determination unit is used to determine the first current of the display pixels in the first display area AA1 based on the first voltage-current mapping relationship of the display pixels in the first display area AA1 and the first display voltage.

[0154] The second current determining unit is used to determine the second current of the display pixels in the second display area AA2 based on the first current and the ratio of the luminous efficiency of the first display area AA1 and the second display area AA2.

[0155] The second voltage determination unit is used to determine the second display voltage corresponding to the display pixel in the second display area AA2 based on the second voltage-current mapping relationship and the second current of the display pixel in the second display area AA2.

[0156] Optionally, the voltage mapping relationship based on the first display area AA1 and the second display area AA2 having the same brightness satisfies the following formula (1), wherein formula (1) is:

[0157] The second display voltage is determined according to formula (1).

[0158] (1)

[0159] Where gain is the adjustment coefficient, V1 is the first display voltage, V2 is the second display voltage, a1 is the peak value of the highest point in the first voltage-current mapping relationship, b1 is the abscissa corresponding to the peak value in the first voltage-current mapping relationship, c1 is the standard deviation in the first voltage-current mapping relationship, a2 is the peak value of the highest point in the second voltage-current mapping relationship, b2 is the abscissa corresponding to the peak value in the second voltage-current mapping relationship, and c2 is the standard deviation in the second voltage-current mapping relationship.

[0160] Optionally, the adjustment factor is the ratio of the luminous efficiency of the first display area AA1 and the second display area AA2.

[0161] Optionally, the target grayscale determination module 13 includes:

[0162] The register value determination unit is used to determine the register value corresponding to the second display voltage in the second display area AA2 according to formula (2), which is:

[0163] (2)

[0164] Where Bgl2 is the register value corresponding to the second display voltage; n is the number of bits in the register corresponding to the second display area; Vgsp is the minimum voltage value of the display pixel in the second display area; and Vgmp is the maximum voltage value of the display pixel in the second display area.

[0165] The target grayscale determination unit is used to determine the target grayscale of the display pixels in the second display area AA2 based on the register value corresponding to the second display voltage.

[0166] The display panel brightness adjustment device 10 also includes:

[0167] The pixel position determination module is used to determine the position of the image pixel in the pure grayscale image that corresponds to the second display area AA2;

[0168] The target image generation module is used to replace the grayscale to be displayed of the image pixels corresponding to the second display area AA2 in the image with the target grayscale;

[0169] Optionally, the pixel position determination module includes:

[0170] The pixel physical distance determination unit is used to obtain the physical distance per unit pixel of the image based on the actual size of the first display area AA1 and the pixel resolution of the image.

[0171] The pixel position determination unit is used to obtain the coordinate position of the center of the second display area AA2 in the image and the number of pixels occupied by the radius of the second display area AA2 in the image based on the physical distance of the unit pixel in the image, the actual distance from the boundary of the second display area AA2 to the boundary of the first display area AA1, and the actual radius of the second display area AA2.

[0172] Optionally, the first voltage determination module 11 includes:

[0173] The grayscale response unit with bound points, when responding to the grayscale to be displayed as a grayscale with bound points, uses the bound point voltage corresponding to the grayscale with bound points as the first display voltage;

[0174] The non-binding grayscale response unit, when responding to a non-binding grayscale to be displayed, obtains the first binding grayscale and the second binding grayscale closest to the grayscale to be displayed, and obtains a first display voltage based on the first binding voltage corresponding to the first binding grayscale and the second binding voltage corresponding to the second binding grayscale; wherein, the first binding grayscale is smaller than the grayscale to be displayed, and the grayscale to be displayed is smaller than the second binding grayscale.

[0175] Among them, the binding point grayscale response unit is used to determine the binding point voltage corresponding to the binding point grayscale according to formula (3), which is:

[0176] (3)

[0177] Where Bgl is the register value corresponding to the grayscale to be displayed; n is the number of bits in the register corresponding to the first display area; Vgsp is the minimum voltage value of the pixel displayed in the first display area; and Vgmp is the maximum voltage value of the pixel displayed in the first display area.

[0178] Optional, unbound grayscale response units include:

[0179] The first binding point voltage determination subunit is used to determine the first binding point voltage corresponding to the first binding point grayscale according to formula (4), which is:

[0180]

[0181] Wherein, Bgl01 is the register value corresponding to the grayscale of the first binding point, n is the number of bits of the register corresponding to the first display area, Vgsp is the minimum voltage value of the displayed pixel in the first display area, and Vgmp is the maximum voltage value of the displayed pixel in the first display area.

[0182] The second binding point voltage determination subunit is used to determine the second binding point voltage corresponding to the second binding point grayscale according to formula (5), which is:

[0183]

[0184] Wherein, Bgl02 is the register value corresponding to the grayscale of the second binding point;

[0185] The first display voltage determination subunit is used to determine the first display voltage according to formula (6), which is:

[0186] (6)

[0187] Where Bgl is the register value corresponding to the grayscale to be displayed.

[0188] Optionally, the transmittance of the first display area AA1 is less than the transmittance of the second display area AA2.

[0189] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for adjusting the brightness of a display panel, the display panel comprising a first display area and a second display area, characterized in that, include: Obtain the first display voltage required for the display pixels in the first display area to display the grayscale to be displayed; Based on the voltage mapping relationship when the brightness of the first display area and the second display area is the same, and the luminous efficiency ratio of the first display area and the second display area and the first display voltage, the second display voltage corresponding to the display pixel in the second display area is determined; Based on the second display voltage, the target grayscale of the display pixels in the second display area is determined.

2. The method according to claim 1, characterized in that, The step of determining the second display voltage corresponding to the display pixels in the second display area based on the voltage mapping relationship when the brightness of the first display area and the second display area is the same, and the luminous efficiency ratio of the first display area and the second display area and the first display voltage, includes: Based on the first voltage-current mapping relationship of the display pixels in the first display area and the first display voltage, the first current of the display pixels in the first display area is determined; Based on the first current and the ratio of the luminous efficiency of the first display area to that of the second display area, the second current of the display pixels in the second display area is determined; Based on the second voltage-current mapping relationship of the display pixels in the second display area and the second current, the second display voltage corresponding to the display pixels in the second display area is determined.

3. The method according to claim 1, characterized in that, The voltage mapping relationship when the brightness of the first display area and the second display area is the same satisfies the following formula (1), which is: The second display voltage is determined according to formula (1). Where gain is the adjustment coefficient, V1 is the first display voltage, V2 is the second display voltage, a1 is the peak value of the highest point in the first voltage-current mapping relationship, b1 is the abscissa corresponding to the peak value in the first voltage-current mapping relationship, c1 is the standard deviation in the first voltage-current mapping relationship, a2 is the peak value of the highest point in the second voltage-current mapping relationship, b2 is the abscissa corresponding to the peak value in the second voltage-current mapping relationship, and c2 is the standard deviation in the second voltage-current mapping relationship.

4. The method of claim 3, wherein, The adjustment coefficient is the ratio of the luminous efficiency of the first display area to that of the second display area.

5. The method of claim 1, wherein, The step of determining the target grayscale of the display pixels in the second display area based on the second display voltage includes: The register value corresponding to the second display voltage in the second display area is determined according to formula (2), which is: （2） Wherein, Bgl2 is the register value corresponding to the second display voltage; V2 is the second display voltage; n is the number of bits in the register corresponding to the second display area; Vgsp is the minimum voltage value of the display pixel in the second display area; and Vgmp is the maximum voltage value of the display pixel in the second display area. The target grayscale of the display pixels in the second display area is determined based on the register value corresponding to the second display voltage.

6. The method of claim 1, wherein, Also includes: Determine the position of the image pixel in the pure grayscale image that corresponds to the second display area; Replace the grayscale to be displayed of the image pixels in the image corresponding to the second display area with the target grayscale.

7. The method of claim 6, wherein, The step of determining the position of the image pixel in the pure grayscale image corresponding to the second display area includes: Based on the actual size of the first display area and the pixel resolution of the image, the physical distance per unit pixel of the image is obtained; Based on the physical distance per unit pixel in the image, the actual distance from the boundary of the second display area to the boundary of the first display area, and the actual radius of the second display area, the coordinate position of the center of the second display area in the image and the number of pixels occupied by the radius of the second display area in the image are obtained.

8. The method of claim 1, wherein, The first display voltage required for the display pixels in the first display area to display the grayscale to be displayed includes: In response to the grayscale to be displayed being a bound-point grayscale, the bound-point voltage corresponding to the bound-point grayscale is used as the first display voltage; In response to the grayscale to be displayed being a non-binding grayscale, the first binding grayscale and the second binding grayscale closest to the grayscale to be displayed are obtained, and the first display voltage is obtained based on the first binding voltage corresponding to the first binding grayscale and the second binding voltage corresponding to the second binding grayscale; wherein, the first binding grayscale is smaller than the grayscale to be displayed, and the grayscale to be displayed is smaller than the second binding grayscale.

9. The method of claim 8, wherein, The response to the grayscale to be displayed being a bound-point grayscale, wherein the bound-point voltage corresponding to the bound-point grayscale is used as the first display voltage, includes: The binding point voltage corresponding to the grayscale of the binding point is determined according to formula (3), which is: （3） Wherein, Bgl is the register value corresponding to the grayscale to be displayed; V1 is the first display voltage; n is the number of bits in the register corresponding to the first display area; Vgsp is the minimum voltage value of the displayed pixel in the first display area; and Vgmp is the maximum voltage value of the displayed pixel in the first display area.

10. The method of claim 9, wherein, The first display voltage is obtained based on the first binding point voltage corresponding to the first binding point grayscale and the second binding point voltage corresponding to the second binding point grayscale, including: The first binding point voltage corresponding to the first binding point grayscale is determined according to formula (4), where formula (4) is: Wherein, Bgl01 is the register value corresponding to the first binding point grayscale, n is the number of bits of the register corresponding to the first display area, Vgsp is the minimum voltage value of the displayed pixel in the first display area, and Vgmp is the maximum voltage value of the displayed pixel in the first display area. The second binding point voltage corresponding to the gray level of the second binding point is determined according to formula (5), which is: Wherein, Bgl02 is the register value corresponding to the grayscale of the second binding point; The first display voltage is determined according to formula (6), which is: (6) Wherein, Bgl is the register value corresponding to the grayscale to be displayed.

11. The method of claim 1, wherein, The transmittance of the first display area is less than that of the second display area.

12. A display panel brightness adjustment apparatus, the display panel comprising a first display area and a second display area, characterized by, The brightness adjustment device includes: The first voltage determination module is used to obtain the first display voltage required when the display pixels in the first display area display the grayscale to be displayed. The second voltage determination module is used to determine the second display voltage corresponding to the display pixels in the second display area based on the voltage mapping relationship when the brightness of the first display area and the second display area are the same, the luminous efficiency ratio of the first display area and the second display area and the first display voltage; The target grayscale determination module is used to determine the target grayscale of the display pixels in the second display area based on the second display voltage.

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