Display screen brightness correction method and device, electronic equipment and storage medium

Abstract

The present disclosure relates to a display screen brightness correction method, a display screen brightness correction device, an electronic device and a storage medium. The display screen brightness correction method comprises: determining a standard frame image corresponding gray scale brightness mean value and a to-be-corrected frame image corresponding gray scale compensation brightness value based on the gray scale brightness of each frame image of a plurality of display screens when displayed; and determining the to-be-corrected frame image corresponding brightness control duty cycle based on the to-be-corrected frame image corresponding gray scale compensation brightness value and the standard frame image corresponding gray scale brightness mean value and the brightness control duty cycle when the standard frame image is displayed. The present application adjusts the brightness control duty cycle to make the display brightness of the to-be-corrected frame image consistent with the brightness when the standard frame image is displayed, thereby correcting the change of the light-emitting brightness when the screen body refresh frequency is caused by TFT threshold drift.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of information processing, and in particular to a display screen brightness correction method, a display screen brightness correction device, an electronic device, and a storage medium. BACKGROUND

[0002] Nowadays, many electronic devices use LTPO (Low Temperature Polycrystalline Oxide) screens for their display screens. LTPO is a combination of the current mainstream OLED screen LTPS (Low Temperature Poly-Silicon) and IGZO (indium gallium zinc oxide) solutions. LTPO combines the advantages of both LTPS and IGZO, retaining high electron mobility and having the advantages of low-frequency driving, lower power consumption, etc. However, under low-frequency driving, IGZO and LTPS TFT are under long-time bias, which can cause TFT threshold drift, resulting in changes in the luminance of the screen body refresh frequency. SUMMARY

[0003] The present disclosure provides a display screen brightness correction method, a display screen brightness correction device, an electronic device, and a storage medium.

[0004] In a first aspect, the present disclosure provides a display screen brightness correction method, comprising:

[0005] obtaining, for each display screen, a corresponding gray scale brightness value when the display screen displays each frame image in a refresh frequency range;

[0006] determining a standard frame image corresponding gray scale brightness mean value and a to-be-corrected frame image corresponding gray scale compensation brightness value based on the corresponding gray scale brightness values of each frame image displayed by each display screen; wherein the standard frame image is a frame image whose gray scale brightness has been determined in the refresh frequency range, the to-be-corrected frame image is a to-be-displayed frame image whose display brightness is to be corrected in the refresh frequency range, the standard frame image corresponding gray scale brightness mean value is an average value of a plurality of gray scale brightness values corresponding to the standard frame image displayed by a plurality of display screens, and the to-be-corrected frame image corresponding gray scale compensation brightness value is a gray scale brightness value that needs to be compensated when the to-be-corrected frame image is displayed by the to-be-corrected display screen;

[0007] determining a brightness control duty cycle corresponding to the to-be-corrected frame image displayed by the to-be-corrected display screen based on the to-be-corrected frame image corresponding gray scale compensation brightness value, the standard frame image corresponding gray scale brightness mean value, and a brightness control duty cycle when the standard frame image is displayed;

[0008] adjust a display brightness corresponding to a display of the to-be-corrected frame image by the to-be-corrected display screen based on the determined duty cycle of the to-be-corrected frame image.

[0009] In some embodiments, the determining the gray-scale compensation brightness value corresponding to the to-be-corrected frame image based on the gray-scale brightness values respectively corresponding to the displays of the frame images by the display screens comprises:

[0010] determining a gray-scale brightness mean value corresponding to the to-be-corrected frame image based on the gray-scale brightness values respectively corresponding to the displays of the frame images by the display screens, and a correlation between the gray-scale brightness mean value corresponding to the to-be-corrected frame image and the gray-scale compensation brightness value corresponding to the to-be-corrected frame image; wherein the gray-scale brightness mean value corresponding to the to-be-corrected frame image is an average of the multiple gray-scale brightness values respectively corresponding to the displays of the to-be-corrected frame image by the multiple display screens before the brightness correction;

[0011] obtaining the gray-scale compensation brightness value corresponding to the display of the to-be-corrected frame image by the to-be-corrected display screen based on the correlation between the gray-scale brightness mean value corresponding to the to-be-corrected frame image and the gray-scale compensation brightness value corresponding to the to-be-corrected frame image, and the gray-scale brightness mean value corresponding to the to-be-corrected frame image.

[0012] In some embodiments, the correlation comprises at least a linear correlation.

[0013] The determining the correlation between the gray-scale brightness mean value corresponding to the to-be-corrected frame image and the gray-scale compensation brightness value corresponding to the to-be-corrected frame image based on the gray-scale brightness values respectively corresponding to the displays of the frame images by the display screens comprises at least:

[0014] determining the gray-scale brightness mean value and the gray-scale brightness difference mean value respectively corresponding to each gray-scale when displaying the to-be-corrected frame image based on the gray-scale brightness values respectively corresponding to the displays of the frame images by the display screens; wherein the gray-scale brightness mean value corresponding to one gray-scale is determined as an average of the brightness values of the same gray-scale when displaying the to-be-corrected frame image by the multiple display screens; and the gray-scale brightness difference mean value corresponding to the one gray-scale is determined as an average of the difference values corresponding to the same gray-scale brightness when displaying the to-be-corrected frame image and the standard frame image.

[0015] determining a fitting parameter by performing linear fitting on a residual sum of squares of the gray-scale brightness difference mean value and the gray-scale brightness mean value respectively corresponding to each gray-scale through a least square method; and the fitting parameter is used to determine a linear correlation between the gray-scale brightness mean value corresponding to the to-be-corrected frame image and the gray-scale compensation brightness value corresponding to the to-be-corrected frame image.

[0016] In some embodiments, based on the gray scale compensation brightness value corresponding to the frame image to be corrected, the gray scale brightness mean value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed, a brightness control duty cycle corresponding to the frame image to be corrected when displayed on the display screen to be corrected is determined, at least including:

[0017] Based on the gray scale compensation brightness value corresponding to the frame image to be corrected, the gray scale brightness mean value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed, the brightness control duty cycle corresponding to the frame image to be corrected when displayed on the display screen to be corrected is determined, and the duty cycle change amount of the brightness control duty cycle when the standard frame image is displayed is determined.

[0018] Based on the duty cycle change amount and the brightness control duty cycle when the standard frame image is displayed, the brightness control duty cycle corresponding to the frame image to be corrected when displayed on the display screen to be corrected is determined.

[0019] In some embodiments, the display brightness corresponding to the frame image to be corrected when displayed on the display screen to be corrected is adjusted based on the determined brightness control duty cycle of the frame image to be corrected, including:

[0020] If the display brightness of the display screen to be corrected when displaying the frame image to be corrected does not reach a predetermined brightness value after adjusting the brightness control duty cycle, the gray scale brightness values corresponding to each frame image displayed on the display screen to be corrected are collected.

[0021] According to the collected gray scale brightness values corresponding to each frame image displayed on the display screen to be corrected, the gray scale compensation brightness value corresponding to the frame image to be corrected and the brightness control duty cycle corresponding to the frame image to be displayed are re-determined.

[0022] In some embodiments, the frame image to be corrected is a plurality of frame images.

[0023] The display brightness corresponding to the frame image to be corrected when displayed on the display screen to be corrected is adjusted based on the determined brightness control duty cycle of the frame image to be corrected, at least including:

[0024] According to the display order of each frame image to be corrected in the refresh frequency range, the display brightness corresponding to the frame image to be corrected is adjusted in sequence.

[0025] In some embodiments, the collected gray scale brightness values corresponding to each frame image displayed on each display screen include:

[0026] Each gray scale brightness value corresponding to each frame image displayed on each display screen; or,

[0027] The first gray scale brightness value and the second gray scale brightness value correspond to respective frame images displayed by the display screens, wherein the first gray scale brightness value and the second gray scale brightness value are part of the gray scale brightness values, and the second gray scale brightness value corresponds to a gray scale level lower than a gray scale level corresponding to the first gray scale brightness value; and the gray scale brightness values further include a third gray scale brightness value, which corresponds to a gray scale level lower than a gray scale level corresponding to the second gray scale brightness value.

[0028] A second aspect of the embodiments of the present disclosure provides a display screen brightness correction device, which comprises:

[0029] A first processing unit is configured to obtain gray scale brightness values corresponding to respective frame images displayed by the display screens.

[0030] A second processing unit is configured to determine a mean gray scale brightness value corresponding to a standard frame image and a gray scale compensation brightness value corresponding to a frame image to be corrected, based on the gray scale brightness values corresponding to the respective frame images displayed by the display screens.

[0031] A third processing unit is configured to determine a brightness control duty cycle corresponding to the frame image to be corrected, based on the gray scale compensation brightness value corresponding to the frame image to be corrected, the mean gray scale brightness value corresponding to the standard frame image, and a brightness control duty cycle when the standard frame image is displayed.

[0032] A fourth processing unit is configured to adjust a display brightness corresponding to the frame image to be corrected, based on the determined brightness control duty cycle of the frame image to be corrected.

[0033] In some embodiments, the second processing unit is configured to

[0034] determine a gray scale brightness mean value corresponding to the frame image to be corrected and a correlation between the gray scale brightness mean value corresponding to the frame image to be corrected and a gray scale compensation brightness value corresponding to the frame image to be corrected based on the gray scale brightness values corresponding to the frame images displayed by the respective display screens; the gray scale brightness mean value corresponding to the frame image to be corrected is an average of the multiple gray scale brightness values corresponding to the frame image to be corrected displayed by the multiple display screens before brightness correction;

[0035] obtain the gray scale compensation brightness value corresponding to the frame image to be corrected displayed by the display screen to be corrected based on the correlation between the gray scale brightness mean value corresponding to the frame image to be corrected and the gray scale compensation brightness value corresponding to the frame image to be corrected and the gray scale brightness mean value corresponding to the frame image to be corrected.

[0036] In some embodiments, the correlation includes at least a linear correlation;

[0037] The second processing unit is configured to

[0038] determine a gray scale brightness mean value corresponding to each gray scale and a gray scale brightness difference mean value when the frame image to be corrected is displayed based on the gray scale brightness values corresponding to the frame images displayed by the respective display screens; the gray scale brightness mean value corresponding to one gray scale is determined as an average of the brightness values of the same gray scale when the frame image to be corrected is displayed by the multiple display screens; and the gray scale brightness difference mean value corresponding to the one gray scale is determined as an average of the difference values corresponding to the same gray scale brightness when the frame image to be corrected is displayed and when the standard frame image is displayed.

[0039] determine a fitting parameter by linear fitting the residual sum of squares of the gray scale brightness difference mean value corresponding to each gray scale and the gray scale brightness mean value using the least square method; the fitting parameter is used to determine a linear correlation between the gray scale brightness mean value corresponding to the frame image to be corrected and the gray scale compensation brightness value corresponding to the frame image to be corrected.

[0040] In some embodiments, the third processing unit is configured to

[0041] determine a brightness control duty cycle change amount of the display screen to be corrected relative to the brightness control duty cycle when the standard frame image is displayed based on the gray scale compensation brightness value corresponding to the frame image to be corrected, the gray scale brightness mean value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed.

[0042] determine the corresponding brightness control duty cycle of the to-be-corrected display screen when displaying the to-be-corrected frame image based on the duty cycle variation and the brightness control duty cycle when displaying the standard frame image.

[0043] In some embodiments, the fourth processing unit is configured to

[0044] If the display brightness of the to-be-corrected display screen when displaying the to-be-corrected frame image does not reach a predetermined brightness value after adjusting the brightness control duty cycle, the corresponding gray scale brightness values of the to-be-corrected display screen when displaying each frame image are collected.

[0045] According to the collected corresponding gray scale brightness values of the to-be-corrected display screen when displaying each frame image, the corresponding gray scale compensation brightness value of the to-be-corrected frame image and the corresponding brightness control duty cycle of the to-be-corrected frame image when being displayed are re-determined.

[0046] In some embodiments, the to-be-corrected frame image is a plurality of frame images.

[0047] The fourth processing unit is configured to

[0048] According to the display order of each to-be-corrected frame image in the refresh frequency range, the corresponding display brightness of the to-be-corrected frame image is adjusted in sequence.

[0049] In some embodiments, the obtained corresponding gray scale brightness values of each display screen when displaying each frame image include:

[0050] each gray scale brightness value corresponding to each display screen when displaying each frame image; or

[0051] a first gray scale brightness value and a second gray scale brightness value corresponding to each display screen when displaying each frame image, wherein the first gray scale brightness value and the second gray scale brightness value are part of the gray scale brightness values, and the gray scale level corresponding to the second gray scale brightness value is lower than the gray scale level corresponding to the first gray scale brightness value; wherein the gray scale brightness values further include a third gray scale brightness value, and the gray scale level corresponding to the third gray scale brightness value is lower than the gray scale level corresponding to the second gray scale brightness value.

[0052] A third aspect of the embodiments of the present disclosure provides an electronic device, comprising a processor and a memory, wherein the memory stores a computer program capable of running on the processor, and the processor is configured to run the computer program to execute the steps of the method of the first aspect.

[0053] The fourth aspect of the embodiments of the present disclosure provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the method in the first aspect.

[0054] The technical solutions provided by the embodiments of the present disclosure can have the following beneficial effects.

[0055] The display screen brightness correction method in the embodiments of the present disclosure comprises: acquiring a plurality of display screens corresponding gray scale brightness values when displaying a plurality of frames of images at a refresh frequency range; determining a standard frame image corresponding gray scale brightness average value and a to-be-corrected frame image corresponding gray scale compensation brightness value based on the plurality of display screens corresponding gray scale brightness values when displaying the plurality of frames of images; wherein the standard frame image is a frame image whose gray scale brightness has been determined in the refresh frequency range, the to-be-corrected frame image is a to-be-displayed frame image whose display brightness needs to be corrected in the refresh frequency range, the standard frame image corresponding gray scale brightness average value is an average value of a plurality of gray scale brightness values corresponding to the standard frame image displayed by the plurality of display screens, and the to-be-corrected frame image corresponding gray scale compensation brightness value is a gray scale brightness value that needs to be compensated when the to-be-corrected display screen displays the to-be-corrected frame image; determining a brightness control duty cycle corresponding to the to-be-corrected display screen when displaying the to-be-corrected frame image based on the to-be-corrected frame image corresponding gray scale compensation brightness value, the standard frame image corresponding gray scale brightness average value, and a brightness control duty cycle when the standard frame image is displayed; and adjusting the display brightness corresponding to the to-be-corrected display screen when displaying the to-be-corrected frame image based on the determined brightness control duty cycle corresponding to the to-be-corrected frame image. In the present application, a large number of frame image display corresponding gray scale brightness data of the display screen are collected to determine the to-be-corrected frame image corresponding gray scale compensation brightness value relative to the standard frame image, and then the brightness control duty cycle corresponding to the to-be-corrected frame image is determined through the to-be-corrected frame image corresponding gray scale compensation brightness value, so that the display brightness of the to-be-corrected frame image can be consistent with the brightness when the standard frame image is displayed by adjusting the brightness control duty cycle when the to-be-corrected display screen displays the to-be-corrected frame image, thereby correcting the change of the light-emitting brightness at the refresh frequency of the screen body caused by the TFT threshold drift.

[0056] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0057] The accompanying drawings, which are incorporated into the specification and constitute part of the specification, illustrate embodiments consistent with the present disclosure and, together with the specification, serve to explain the principles of the present disclosure.

[0058] Figure 1 is a display screen refresh frequency brightness decay schematic diagram according to an exemplary embodiment.

[0059] Figure 2 is a display screen brightness correction method flow chart according to an example embodiment.

[0060] Figure 3 is a display screen brightness correction method flow chart according to an example embodiment.

[0061] Figure 4 is a display screen brightness correction method flow chart according to an example embodiment.

[0062] Figure 5 is a display screen brightness correction method flow chart according to an example embodiment.

[0063] Figure 6 is a display screen brightness correction method flow chart according to an example embodiment. DETAILED DESCRIPTION

[0064] The example embodiments will now be described in detail with reference to the accompanying drawings. If the description of the embodiments with reference to the accompanying drawings is identical or similar, the same or similar components are designated by the same reference numerals as appropriate without repeated description thereof. The embodiments described in the example embodiments below do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0065] Now many electronic devices use LTPO (Low Temperature Polycrystalline Oxide) screens for their display screens. LTPO is a combination of the current mainstream OLED screen LTPS (Low Temperature Poly-Silicon) and IGZO (indium gallium zinc oxide) solutions. LTPO combines the advantages of both LTPS and IGZO, retaining high electron mobility and having the advantages of low-frequency driving, lower power consumption, etc. However, under low-frequency driving, IGZO and LTPS TFT are under long-time bias, which can cause TFT threshold drift, resulting in changes in luminous brightness as shown in the screen refresh frequency. Figure 1 is a display screen brightness correction method flow chart according to an example embodiment. Figure 1 is a display screen brightness correction method flow chart according to an example embodiment. Figure 1 As shown in the figure, under long-time bias, LTPS TFT can produce a certain threshold voltage drift, causing brightness decay.

[0066] The embodiments of the present disclosure provide a display screen brightness correction method. Figure 2is a flow chart of a display screen brightness correction method according to an exemplary embodiment. As shown in Figure 2 The display screen brightness correction method comprises:

[0067] Step 10, obtaining the gray scale brightness values corresponding to each frame image displayed by each display screen in a refresh frequency range;

[0068] Step 11, determining the gray scale brightness mean value corresponding to a standard frame image and the gray scale compensation brightness value corresponding to a frame image to be corrected based on the gray scale brightness values corresponding to each frame image displayed by each display screen; wherein the standard frame image is a frame image whose gray scale brightness has been determined in the refresh frequency range, the frame image to be corrected is a frame image to be displayed whose display brightness is to be corrected in the refresh frequency range, the gray scale brightness mean value corresponding to the standard frame image is the average of the multiple gray scale brightness values corresponding to the standard frame image displayed by the multiple display screens, and the gray scale compensation brightness value corresponding to the frame image to be corrected is the gray scale brightness value that needs to be compensated corresponding to the frame image to be corrected displayed by the display screen to be corrected;

[0069] Step 12, determining the brightness control duty cycle corresponding to the frame image to be corrected displayed by the display screen to be corrected based on the gray scale compensation brightness value corresponding to the frame image to be corrected, the gray scale brightness mean value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed;

[0070] Step 13, adjusting the display brightness corresponding to the frame image to be corrected displayed by the display screen to be corrected based on the determined brightness control duty cycle of the frame image to be corrected.

[0071] The brightness control duty cycle is used to determine the light-emitting time of the display light source of the display screen in a light-emitting period of the display light source, and one frame image displayed by the display screen corresponds to one light-emitting period of the display light source. The display brightness of the display screen when displaying one frame image can be adjusted by the brightness control duty cycle (EM duty). The greater the brightness control duty cycle, the longer the light-emitting time of the display light source in a light-emitting period of the display light source, and the brighter the display brightness of the display screen when displaying one frame image. The display brightness of the display screen when displaying one frame image is the average display brightness in the light-emitting period of the display light source when displaying one frame image, that is, the average brightness obtained by dividing the brightness accumulation of the light-emitting brightness of the display light source in the continuous light-emitting time by the light-emitting period of the display light source.

[0072] The multiple display screens can be display screens of the same type. The display screens of the same type can include display screens of the same model or display screens of the same attribute. For example, the display screens of the same type can be LTPO display screens of the same model installed on the same mobile phone.

[0073] The frame image refers to an image displayed at any frequency when the refresh frequency is 1-120 Hz; each frame image has a different gray scale, and each gray scale corresponds to a different brightness value;

[0074] The standard frame image is a frame image with a determined gray scale brightness, that is, the display brightness of the display screen when displaying the standard frame image is known and determined, that is, the brightness duty cycle of the display screen when displaying the standard frame image is determined. In actual application, the standard frame image can be determined as the first frame image when displaying the frame image in the frequency refresh range. Since the frame image is displayed from the first frame image to the 120th frame image in sequence when displaying the frame image in the frequency refresh range, the brightness decay can also be regarded as the brightness decay relative to the first frame image in sequence. Therefore, the first frame image can be taken as the standard frame image when displaying.

[0075] The frame image to be corrected is a frame image with brightness decay when the display screen displays the standard frame image in the frequency refresh range. These frame images with brightness decay need brightness correction when displaying, and therefore can all be regarded as frame images to be corrected.

[0076] The gray scale compensation brightness value corresponding to the frame image to be corrected is the gray scale brightness value that needs to be compensated when the display screen to be corrected displays the frame image to be corrected. When displaying the frame image to be corrected in the frequency refresh range, the frame image to be corrected will have brightness decay relative to the standard frame image, and the decayed brightness is the brightness that needs to be compensated. The size of the decayed brightness is the gray scale brightness value that needs to be compensated.

[0077] In the embodiment of the present disclosure, under low frame rate driving, although the signal voltage holding capability is improved by adopting IGZO TFT, OLED current is very sensitive to the characteristic change of the driving TFT, and in the case of long time bias, LTPS TFT will produce a certain threshold voltage drift, which will also affect the compensation effect of the pixel circuit, thereby causing the change of brightness. Therefore, the AMOLED pixel circuit design based on LTPO TFT needs to compensate the influence caused by the instability of IGZO TFT negative gate voltage bias under low frame rate driving through peripheral compensation circuit or other optical compensation scheme. In the present application, the display brightness adjustment can be realized by fine tuning the EM duty brightness control duty cycle corresponding to the frame image display through the DDIC display driving chip.

[0078] In the embodiments of the present disclosure, when determining the brightness control duty cycle corresponding to the frame image to be corrected, the gray scale brightness data of each frame image corresponding to the display of the same type of display screen in the refresh frequency range can be collected, and the brightness control duty cycle corresponding to the frame image to be corrected is determined according to the obtained data. Through the analysis and determination of the gray scale brightness data of multiple same type display screens, the determined brightness control duty cycle can be adaptively popularized in a large number of same type display screens. The display screen to be corrected in the present application belongs to the same type of display screen.

[0079] In the embodiments of the present disclosure, the refresh frequency range includes 120Hz / 60Hz, etc. The display screen brightness correction method of the present application can be applied to the display screen refresh display of 120Hz or 60Hz, etc. The standard frame image can be determined as the first frame display image in the refresh frequency range, and the frame image to be corrected can be determined as the second frame display image to the nth frame display image in the refresh frequency range, wherein n ranges from 2 to 120.

[0080] In the embodiments of the present disclosure, the gray scale includes at least 1-255 gray scales. A batch of screen bodies are collected to collect low-frequency driving brightness change data in one frame: taking the basic frequency of 120Hz as an example; record the brightness data {L1_1[1:255], L1_2[1:255]……L1_119[1:255], L1_120[1:255],……,{Ln_1[1:255], Ln_2[1:255]……Ln_119[1:255], Ln_120[1:255]}; wherein Ln_i[1:255] is the 1-255 gray scale brightness data corresponding to the i-th frame image display of the n-th screen body. Ln_i[1:255] contains 255 gray scale brightness data of 1 gray scale-255 gray scale. Wherein, i represents the display order of the frame image refresh in the refresh frequency range, i takes the value range of 1-120; n is the number of screen bodies.

[0081] The display screen brightness correction method in the embodiments of the present disclosure includes: acquiring respective gray scale brightness values corresponding to respective frames of images when a plurality of same type display screens display the frames of images in a refresh frequency range; determining a gray scale brightness mean value corresponding to a standard frame of image and a gray scale compensation brightness value corresponding to a frame of image to be corrected based on the respective gray scale brightness values corresponding to the respective frames of images when the plurality of same type display screens display the frames of images in the refresh frequency range; wherein the standard frame of image is a frame of image whose display brightness in the refresh frequency range has been determined, the frame of image to be corrected is a frame of image to be displayed whose display brightness in the refresh frequency range is to be corrected, the gray scale brightness mean value corresponding to the standard frame of image is an average value of a plurality of gray scale brightness values corresponding to a plurality of display screens displaying the standard frame of image, and the gray scale compensation brightness value corresponding to the frame of image to be corrected is a gray scale brightness value that needs to be compensated when a display screen to be corrected displays the frame of image to be corrected; determining a brightness control duty cycle corresponding to the frame of image to be corrected when the display screen to be corrected displays the frame of image to be corrected based on the gray scale compensation brightness value corresponding to the frame of image to be corrected, the gray scale brightness mean value corresponding to the standard frame of image, and a brightness control duty cycle when the standard frame of image is displayed; and adjusting a display brightness corresponding to the frame of image to be corrected when the display screen to be corrected displays the frame of image to be corrected based on the determined brightness control duty cycle of the frame of image to be corrected. In the present application, a large amount of gray scale brightness data corresponding to frame of image display of same type display screens is collected to determine the gray scale compensation brightness value corresponding to the frame of image to be corrected relative to the standard frame of image, and then the corresponding brightness control duty cycle is determined based on the gray scale compensation brightness value corresponding to the frame of image to be corrected, so that when the display screen to be corrected displays the frame of image to be corrected, the display brightness of the frame of image to be corrected can be made consistent with the display brightness of the standard frame of image by adjusting the brightness control duty cycle, thereby correcting the change in luminous brightness at the refresh frequency of the screen body caused by TFT threshold drift.

[0082] Figure 3 A display screen luminance display diagram after brightness correction according to an exemplary embodiment is shown. As shown in Figure 3 the display screen luminance display diagram after brightness correction can compensate for the luminance decay caused by threshold voltage drift of LTPS TFT due to long time bias, thereby making the display luminance of the front and rear frames of image consistent.

[0083] In the embodiments of the present disclosure, when the brightness control duty cycle corresponding to the frame of image to be corrected is determined, the change amount of the duty cycle based on the brightness control duty cycle when the standard frame of image is displayed can be determined based on the gray scale compensation brightness value corresponding to the frame of image to be corrected; and the brightness control duty cycle corresponding to the frame of image to be corrected is determined based on the determined change amount of the duty cycle and the brightness control duty cycle when the standard frame of image is displayed.

[0084] In some embodiments,

[0085] The gray scale compensation brightness value corresponding to the to-be-corrected frame image is determined based on the gray scale brightness values corresponding to the respective frame images displayed by the respective display screens, and the method comprises:

[0086] The gray scale brightness mean value corresponding to the to-be-corrected frame image is determined based on the gray scale brightness values corresponding to the respective frame images displayed by the respective display screens, and the correlation between the gray scale brightness mean value corresponding to the to-be-corrected frame image and the gray scale compensation brightness value corresponding to the to-be-corrected frame image; wherein the gray scale brightness mean value corresponding to the to-be-corrected frame image is the average of the plurality of gray scale brightness values corresponding to the respective display screens when displaying the to-be-corrected frame image before brightness correction.

[0087] The gray scale compensation brightness value corresponding to the to-be-corrected frame image is determined based on the gray scale brightness values corresponding to the respective frame images displayed by the respective display screens, and the method comprises:

[0088] In the embodiments of the present disclosure, the correlation between the gray scale brightness mean value corresponding to the to-be-corrected frame image and the gray scale compensation brightness value corresponding to the to-be-corrected frame image can be determined by analyzing the gray scale brightness values of the respective frame images displayed by a large number of display screens, and the gray scale compensation brightness value can be obtained based on the correlation and the gray scale brightness mean value corresponding to the to-be-corrected frame image. The correlation can include a linear correlation, a proportional relationship, a quadratic linear relationship, etc. For example, the gray scale brightness mean value corresponding to the i-th to-be-corrected frame image is X_i; the gray scale compensation brightness value corresponding to the i-th to-be-corrected frame image is Y_i; wherein Y_i and X_i can have a linear relationship: Y_i=aX_i+b, a and b are fitting parameters, i represents the display order of the frame image refresh in the refresh frequency range, and i takes a value in the range of 1-120. Each i value corresponds to a set of fitting parameters a and b for each to-be-corrected frame image. Or,

[0089] Y_i and X_i can have a quadratic linear relationship: Y_i=aX 2 _i+bX_i+c, a, b, and c are fitting parameters, i represents the display order of the frame image refresh in the refresh frequency range, and i takes a value in the range of 1-120. Each i value corresponds to a set of fitting parameters a, b, and c for each to-be-corrected frame image. The gray scale compensation brightness value corresponding to the to-be-corrected frame image displayed by the to-be-corrected display screen can be obtained by the fitting parameters and the linear relationship.

[0090] In some embodiments,

[0091] The correlation at least includes a linear correlation;

[0092] The correlation between the average gray scale brightness value corresponding to the to-be-corrected frame image and the gray scale compensation brightness value corresponding to the to-be-corrected frame image is determined based on the gray scale brightness values corresponding to the respective frame images displayed by the respective display screens, and at least includes:

[0093] The average gray scale brightness value and the average gray scale brightness difference value corresponding to each gray scale when the to-be-corrected frame image is displayed are determined based on the gray scale brightness values corresponding to the respective frame images displayed by the respective display screens; wherein the average gray scale brightness value corresponding to one gray scale is determined as the average value of the brightness values of the same gray scale when the to-be-corrected frame image is displayed by the plurality of display screens; and the average gray scale brightness difference value corresponding to the one gray scale is determined as the average value of the difference values corresponding to the same gray scale brightness when the to-be-corrected frame image is displayed and when the standard frame image is displayed.

[0094] The residual sum of squares of the average gray scale brightness difference value and the average gray scale brightness value corresponding to each gray scale is linearly fitted by the least square method to determine a fitting parameter; the fitting parameter is used to determine the linear correlation between the average gray scale brightness value corresponding to the to-be-corrected frame image and the gray scale compensation brightness value corresponding to the to-be-corrected frame image.

[0095] In the embodiments of the present disclosure, the linear correlation at least includes a linear correlation of a straight line or a quadratic relationship. The gray scale compensation brightness value is obtained through the linear correlation between the average gray scale brightness value corresponding to the to-be-corrected frame image and the gray scale compensation brightness value corresponding to the to-be-corrected frame image, and the average gray scale brightness value corresponding to the to-be-corrected frame image. Then the brightness control duty cycle corresponding to the to-be-corrected frame image is determined through the gray scale compensation brightness value.

[0096] In the embodiments of the present disclosure, the average gray scale brightness value corresponding to each gray scale is Lave_i[j]; wherein Lave_i[j] = (L1_i[j] + … + Ln_i[j]) / n; n is the number of screens, i represents the display order of the frame image refresh in the refresh frequency range, i takes a value in the range of 1-120, and j is the gray scale. The average gray scale brightness difference value corresponding to each gray scale is Lave'_i[j]; Lave'_i[j] = (L1_i[j] - L1_1[j] + L2_i[j] - L2_1[j] + … + Ln_i[j] - Ln_1[j]) / n, wherein i is greater than 2; in L1_i[j], i = 1 corresponds to the standard frame image, and i greater than 2 corresponds to the to-be-corrected frame image.

[0097] In the embodiments of the present disclosure, the average gray scale brightness value corresponding to the i-th to-be-corrected frame image is X_i; and the gray scale compensation brightness value corresponding to the i-th to-be-corrected frame image is Y_i; wherein Y_i and X_i can have a linear relationship: Y_i = aX_i + b, a and b are both fitting parameters.

[0098] In the embodiments of the present disclosure, the fitting parameters a and b can be obtained by a least square method

[0099] obtained; wherein S_r is a residual sum of squares, and the fitting parameters a and b are obtained by finding the minimum value of S_r. For example, S_r is solved to be equal to 0 as much as possible, and the fitting parameters a and b are obtained. Wherein i represents the display order of the frame image refresh in the refresh frequency range, and i takes a value range of 1-120. Each value of i corresponds to a set of fitting parameters a and b for each frame image to be corrected.

[0100] In some embodiments, based on the gray scale compensation luminance value corresponding to the frame image to be corrected, the gray scale luminance mean value corresponding to the standard frame image, and the luminance control duty cycle when the standard frame image is displayed, the luminance control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected is determined, at least including:

[0101] Based on the gray scale compensation luminance value corresponding to the frame image to be corrected, the gray scale luminance mean value corresponding to the standard frame image, and the luminance control duty cycle when the standard frame image is displayed, the luminance control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected is determined, and the duty cycle change amount of the luminance control duty cycle relative to the luminance control duty cycle when the standard frame image is displayed;

[0102] Based on the duty cycle change amount and the luminance control duty cycle when the standard frame image is displayed, the luminance control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected is determined.

[0103] In the embodiments of the present disclosure, when the frame image is displayed in the refresh frequency range, the standard frame image has a determined luminance control duty cycle, and the luminance control duty cycle corresponding to the frame image to be corrected can be adjusted on the basis of the luminance control duty cycle of the standard frame image, that is

[0104] In determining the luminance control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected, the duty cycle change amount of the luminance control duty cycle corresponding to the frame image to be corrected relative to the luminance control duty cycle corresponding to the standard frame image can be determined first, and then the luminance control duty cycle corresponding to the frame image to be corrected is obtained by combining the duty cycle change amount on the basis of the luminance control duty cycle corresponding to the standard frame image. The luminance control duty cycle corresponding to the standard frame image is the luminance control duty cycle corresponding to the display screen when displaying the standard frame image.

[0105] For example, in determining the brightness control duty cycle corresponding to the j-th to-be-corrected frame image, the brightness control duty cycle corresponding to the j-th to-be-corrected frame image can be determined by the gray scale compensation brightness Y_i[j] corresponding to the j-th gray scale, the gray scale brightness average corresponding to the standard frame image, and the brightness control duty cycle corresponding to the standard frame image. Wherein, D[i] is the variation of the brightness control duty cycle corresponding to the i-th to-be-corrected frame image relative to the brightness control duty cycle corresponding to the standard frame image;

[0106] D[i] = D1 / Lave_1[j]*Y_i[j], wherein D1 is the EM duty of the standard frame image; the first frame image is determined as the standard frame image, Lave_1[j] is the gray scale brightness average corresponding to the j-th gray scale of the standard frame image, and Y_i[j] is the j-th gray scale compensation brightness corresponding to the i-th to-be-corrected frame image. The brightness control duty cycle corresponding to the i-th to-be-corrected frame image can be determined as D i ; D i = D[i] + D1; that is, the variation of the brightness control duty cycle corresponding to the i-th to-be-corrected frame image relative to the brightness control duty cycle corresponding to the standard frame image is added to the brightness control duty cycle corresponding to the standard frame image, to obtain the brightness control duty cycle corresponding to the i-th to-be-corrected frame image. When displaying the to-be-corrected frame image, the brightness control duty cycle of the display screen can be directly adjusted to the brightness control duty cycle D i .

[0107] In some embodiments, based on the determined brightness control duty cycle of the to-be-corrected frame image, the display brightness of the to-be-corrected display screen when displaying the to-be-corrected frame image is adjusted, including:

[0108] If the display brightness of the to-be-corrected display screen when displaying the to-be-corrected frame image does not reach the predetermined brightness value after adjusting the brightness control duty cycle, the gray scale brightness values corresponding to the display of each frame image of the to-be-corrected display screen are collected;

[0109] According to the collected gray scale brightness values corresponding to the display of each frame image of the to-be-corrected display screen, the gray scale compensation brightness value corresponding to the to-be-corrected frame image and the brightness control duty cycle corresponding to the display of the to-be-corrected frame image are re-determined.

[0110] In the embodiments of the present disclosure, the predetermined brightness value is a brightness that the to-be-corrected display screen needs to reach when displaying the to-be-corrected frame image. If the display brightness of the to-be-corrected display screen when displaying the to-be-corrected frame image does not reach the predetermined brightness value, it means that the obtained brightness control duty cycle is not accurate, at least for adjusting the to-be-corrected display screen, and the ideal display brightness is not reached. At this time, the gray scale brightness data of the display screen can be added to the n display screens in the above embodiment, for re-determining the gray scale compensation brightness value corresponding to the to-be-corrected frame image and the brightness control duty cycle corresponding to the to-be-corrected frame image when displaying, and testing and verifying by using a new batch of modules until passing the verification, so as to avoid some defects caused by process fluctuations.

[0111] In some embodiments, the to-be-corrected frame image is a plurality of frame images.

[0112] The adjusting of the display brightness corresponding to the to-be-corrected frame image when the to-be-corrected display screen displays the to-be-corrected frame image based on the determined brightness control duty cycle of the to-be-corrected frame image at least includes:

[0113] According to the display order of each to-be-corrected frame image in the refresh frequency range, the display brightness corresponding to the to-be-corrected frame image when displaying is adjusted in sequence.

[0114] In the embodiments of the present disclosure, there can be one standard frame image and 119 to-be-corrected frame images in the refresh frequency range. The second frame image to the 120th frame image can be regarded as to-be-corrected frame images. The 119 to-be-corrected frame images can be displayed in sequence according to the arrangement order from the second frame image to the 120th frame image when displaying.

[0115] At the same time, when sequentially displaying, the corresponding brightness control duty cycles of each frame image can be determined by the above method; that is, the brightness control duty cycle D2 corresponding to the second frame image, the brightness control duty cycle D3 corresponding to the third frame image, and so on, and the brightness control duty cycle D120 corresponding to the 120th frame image. 120 When adjusting the display brightness corresponding to each frame image in sequence, the display brightness corresponding to the second frame image is adjusted by D2, the display brightness corresponding to the third frame image is adjusted by D3, and so on, so as to realize the display brightness adjustment of each frame image in the refresh frequency range.

[0116] In some embodiments, the obtained gray scale brightness value corresponding to each frame image when each display screen displays each frame image respectively includes:

[0117] The gray scale brightness value corresponding to each frame image when each display screen displays each frame image respectively; or

[0118] The first gray scale brightness value and the second gray scale brightness value correspond to part of the gray scale brightness values, and the gray scale level corresponding to the second gray scale brightness value is lower than the gray scale level corresponding to the first gray scale brightness value; wherein the gray scale brightness values further include a third gray scale brightness value, and the gray scale level corresponding to the third gray scale brightness value is lower than the gray scale level corresponding to the second gray scale brightness value.

[0119] In the embodiments of the present disclosure, the first gray scale brightness value can be a high gray scale brightness value, the second gray scale brightness value can be a middle gray scale brightness value, and the third gray scale brightness value can be a low gray scale brightness value. When the frequency refresh range is 255 Hz, the gray scale level corresponding to the first gray scale brightness value can be the gray scale brightness value corresponding to gray scale 171-255, the gray scale level corresponding to the second gray scale brightness value can be the gray scale brightness value corresponding to gray scale 86-170, and the gray scale level corresponding to the third gray scale brightness value can be the gray scale brightness value corresponding to gray scale 1-85. Because the amount of data collected in the present application is too large, part of the gray scale brightness values can be selected to determine the gray scale brightness mean value corresponding to the standard frame image and the gray scale compensation brightness value corresponding to the frame image to be corrected when applied. That is, the gray scale brightness value data used to determine the gray scale brightness mean value corresponding to the standard frame image and the gray scale compensation brightness value corresponding to the frame image to be corrected in the above embodiments can be the gray scale brightness value corresponding to each frame image displayed by each display screen, or the first gray scale brightness value and the second gray scale brightness value corresponding to each frame image displayed by each display screen, or the second gray scale brightness value and the third gray scale brightness value corresponding to each frame image displayed by each display screen.

[0120] The present disclosure provides a display screen brightness correction device. Figure 5 is a structural schematic diagram of a display screen brightness correction device according to an exemplary embodiment. As shown in Figure 5 The display screen brightness correction device includes:

[0121] The first processing unit 51 is configured to obtain the gray scale brightness value corresponding to each frame image displayed by each display screen when the multiple display screens display the frame images in the refresh frequency range;

[0122] The second processing unit 52 is configured to determine a gray scale brightness average value corresponding to a standard frame image and a gray scale compensation brightness value corresponding to a frame image to be corrected based on the gray scale brightness values corresponding to the display of each frame image by each display screen, wherein the standard frame image is a frame image with a determined gray scale brightness in a refresh frequency range, the frame image to be corrected is a frame image to be displayed with a display brightness to be corrected in the refresh frequency range, the gray scale brightness average value corresponding to the standard frame image is an average value of a plurality of gray scale brightness values corresponding to the display of the standard frame image by a plurality of display screens, and the gray scale compensation brightness value corresponding to the frame image to be corrected is a gray scale brightness value that needs to be compensated corresponding to the display of the frame image to be corrected by the display screen to be corrected.

[0123] The third processing unit 53 is configured to determine a brightness control duty cycle corresponding to the display of the frame image to be corrected by the display screen to be corrected based on the gray scale compensation brightness value corresponding to the frame image to be corrected, the gray scale brightness average value corresponding to the standard frame image, and a brightness control duty cycle when the standard frame image is displayed.

[0124] The fourth processing unit 54 is configured to adjust the display brightness corresponding to the display of the frame image to be corrected by the display screen to be corrected based on the determined brightness control duty cycle of the frame image to be corrected.

[0125] The brightness control duty cycle is used to determine the light-emitting time of the display light source of the display screen in a light-emitting period of the display light source, and the display of one frame image by the display screen corresponds to one light-emitting period of the display light source. The display brightness of the display screen when displaying one frame image can be adjusted by the brightness control duty cycle (EM duty). The greater the brightness control duty cycle, the longer the light-emitting time of the display light source in a light-emitting period of the display light source, and the brighter the display brightness of the display screen when displaying one frame image. The display brightness of the display screen when displaying one frame image is the average display brightness in the light-emitting period of the display light source when displaying one frame image, that is, the average brightness obtained by dividing the brightness accumulation of the light-emitting brightness of the display light source in the continuous light-emitting time by the light-emitting period of the display light source.

[0126] The plurality of display screens can be display screens of the same type. The display screens of the same type can include display screens of the same model or display screens of the same attribute. For example, the display screens of the same type are LTPO display screens of the same model installed on the same mobile phone.

[0127] The frame image refers to an image displayed at any frequency when the refresh frequency is 1-120 Hz. Each frame image has different gray scales, and each gray scale corresponds to different brightness values.

[0128] The standard frame image is a frame image with a determined gray scale brightness, i.e., the display brightness of the display screen when displaying the standard frame image is known and determined, i.e., the duty cycle of the brightness of the display screen when displaying the standard frame image is determined. In actual application, the standard frame image can be determined as the first frame image when displaying the frame images in the frequency refresh range. Since the frame images are displayed in sequence from the first frame image to the 120th frame image when displaying the frame images in the frequency refresh range, the brightness decay can also be regarded as the brightness decay relative to the brightness of the first frame image in sequence. Therefore, the first frame image can be taken as the standard frame image when displaying.

[0129] The frame image to be corrected is a frame image with brightness decay when displaying the standard frame image in the frequency refresh range. These frame images with brightness decay need to be corrected when displaying, and therefore can all be regarded as the frame image to be corrected.

[0130] The gray scale compensation brightness value corresponding to the frame image to be corrected is the gray scale brightness value that needs to be compensated when the display screen to be corrected displays the frame image to be corrected. When displaying the frame image to be corrected in the frequency refresh range, the frame image to be corrected will have brightness decay relative to the standard frame image, wherein the decayed brightness is the brightness that needs to be compensated. The size of the decayed brightness is the gray scale brightness value that needs to be compensated.

[0131] In the embodiments of the present disclosure, under the low frame rate driving, although the signal voltage preservation capability is improved by adopting the IGZO TFT, the OLED current is very sensitive to the characteristic change of the driving TFT, and in the case of long time bias, the LTPS TFT will have a certain threshold voltage drift, which will also affect the compensation effect of the pixel circuit, thereby causing the change of the brightness. Therefore, the AMOLED pixel circuit design based on the LTPO TFT needs to compensate the influence caused by the instability of the negative gate voltage bias of the IGZO TFT under the low frame rate driving through the peripheral compensation circuit or other optical compensation scheme. In the present application, the display brightness adjustment can be realized by fine tuning the EM duty brightness control duty cycle corresponding to the frame image display through the DDIC display driving chip.

[0132] In the embodiments of the present disclosure, when determining the brightness control duty cycle corresponding to the frame image to be corrected, the gray scale brightness data corresponding to the display of each frame image in the refresh frequency range of the display screen of the same type can be collected, and the brightness control duty cycle corresponding to the frame image to be corrected is determined according to the obtained data. By analyzing and determining the gray scale brightness data of the display screen of the same type, it is beneficial to adaptively popularize the determined brightness control duty cycle in a large number of display screens of the same type. In the present application, the display screen to be corrected belongs to the display screen of the same type.

[0133] In the embodiments of the present disclosure, the refresh frequency range includes 120Hz / 60Hz, etc. The display screen brightness correction method of the present application can be applied to screen refresh display of 120Hz or 60Hz, etc. The standard frame image can be determined as the first frame display image in the refresh frequency range, and the frame image to be corrected can be determined as the second frame display image to the nth frame display image in the refresh frequency range, wherein n ranges from 2 to 120.

[0134] In the embodiments of the present disclosure, the gray scale at least includes 1-255 gray scales. A batch of screen body low-frequency driving brightness change data in a frame is collected: taking the basic frequency of 120Hz as an example; the brightness data {L1_1[1:255], L1_2[1:255]…L1_119[1:255], L1_120[1:255], …, {Ln_1[1:255], Ln_2[1:255]…Ln_119[1:255], Ln_120[1:255]} is recorded; wherein Ln_i[1:255] is the corresponding 1-255 gray scale brightness data of the nth screen body when the i frame image is displayed. Ln_i[1:255] contains 255 gray scale brightness data of each gray scale from 1 gray scale to 255 gray scale. Wherein, i represents the display order of the frame image refresh in the refresh frequency range, i takes the value range of 1-120; n is the number of screen bodies.

[0135] The display screen brightness correction device in the embodiments of the present disclosure is used for: obtaining respective gray scale brightness values corresponding to respective frames of images when a plurality of same type display screens display the frames of images in a refresh frequency range; determining a gray scale brightness mean value corresponding to a standard frame of image and a gray scale compensation brightness value corresponding to a frame of image to be corrected based on the respective gray scale brightness values corresponding to the respective frames of images when the plurality of same type display screens display the frames of images in the refresh frequency range; wherein the standard frame of image is a frame of image whose display brightness in the refresh frequency range has been determined, the frame of image to be corrected is a frame of image to be displayed whose display brightness in the refresh frequency range is to be corrected, the gray scale brightness mean value corresponding to the standard frame of image is an average value of a plurality of gray scale brightness values respectively corresponding to the standard frame of image displayed by the plurality of display screens, and the gray scale compensation brightness value corresponding to the frame of image to be corrected is a gray scale brightness value that needs to be compensated corresponding to the frame of image to be corrected displayed by the display screen to be corrected; determining a brightness control duty cycle corresponding to the frame of image to be corrected displayed by the display screen to be corrected based on the gray scale compensation brightness value corresponding to the frame of image to be corrected, the gray scale brightness mean value corresponding to the standard frame of image, and a brightness control duty cycle when the standard frame of image is displayed; and adjusting the display brightness corresponding to the frame of image to be corrected displayed by the display screen to be corrected based on the determined brightness control duty cycle of the frame of image to be corrected. In the present application, a large amount of gray scale brightness data corresponding to frame of images of same type display screens is collected to determine the gray scale compensation brightness value corresponding to the frame of image to be corrected relative to the standard frame of image, and then the corresponding brightness control duty cycle is determined based on the gray scale compensation brightness value corresponding to the frame of image to be corrected, so that when the frame of image to be corrected is displayed by the display screen to be corrected, the display brightness of the frame of image to be corrected can be made consistent with the brightness when the standard frame of image is displayed by adjusting the brightness control duty cycle, thereby correcting the change of the light-emitting brightness at the refresh frequency of the screen body caused by the TFT threshold value drift.

[0136] In some embodiments, the second processing unit is configured to

[0137] determine the gray scale brightness mean value corresponding to the frame of image to be corrected based on the respective gray scale brightness values corresponding to the respective frames of images displayed by the respective display screens, and a correlation between the gray scale brightness mean value corresponding to the frame of image to be corrected and the gray scale compensation brightness value corresponding to the frame of image to be corrected; wherein the gray scale brightness mean value corresponding to the frame of image to be corrected is an average value of a plurality of gray scale brightness values respectively corresponding to the frame of image to be corrected displayed by the plurality of display screens before brightness correction;

[0138] obtain the gray scale compensation brightness value corresponding to the frame of image to be corrected displayed by the display screen to be corrected based on the correlation between the gray scale brightness mean value corresponding to the frame of image to be corrected and the gray scale compensation brightness value corresponding to the frame of image to be corrected, and the gray scale brightness mean value corresponding to the frame of image to be corrected.

[0139] In some embodiments, the correlation relationship at least comprises a linear correlation relationship.

[0140] The second processing unit is configured to

[0141] Based on the gray scale brightness values corresponding to the respective display screens when displaying the respective frames of images, the average gray scale brightness value and the average gray scale brightness difference value corresponding to each gray scale when displaying the frame of images to be corrected are determined; the average gray scale brightness value corresponding to one gray scale is determined as the average value of the brightness values of the same gray scale when the multiple display screens display the frame of images to be corrected; and the average gray scale brightness difference value corresponding to the one gray scale is determined as the average value of the difference values corresponding to the same gray scale brightness when displaying the frame of images to be corrected and the frame of standard images.

[0142] The least square method is used to linearly fit the residual sum of squares of the average gray scale brightness difference value and the average gray scale brightness value corresponding to each gray scale, so as to determine the fitting parameter; the fitting parameter is used to determine the linear correlation relationship between the average gray scale brightness value corresponding to the frame of images to be corrected and the gray scale compensation brightness value corresponding to the frame of images to be corrected.

[0143] In some embodiments, the third processing unit is configured to

[0144] Based on the gray scale compensation brightness value corresponding to the frame of images to be corrected, the average gray scale brightness value corresponding to the frame of standard images, and the brightness control duty cycle when displaying the frame of standard images, the brightness control duty cycle corresponding to the frame of images to be corrected when the display screen to be corrected displays the frame of images to be corrected is determined, and the duty cycle change amount relative to the brightness control duty cycle when displaying the frame of standard images is determined.

[0145] Based on the duty cycle change amount and the brightness control duty cycle when displaying the frame of standard images, the brightness control duty cycle corresponding to the frame of images to be corrected when the display screen to be corrected displays the frame of images to be corrected is determined.

[0146] In some embodiments, the fourth processing unit is configured to

[0147] If the display brightness of the display screen to be corrected when displaying the frame of images to be corrected does not reach the predetermined brightness value after adjusting the brightness control duty cycle, the gray scale brightness values corresponding to the respective frames of images displayed by the display screen to be corrected are collected.

[0148] Based on the collected gray scale brightness values corresponding to the respective frames of images displayed by the display screen to be corrected, the gray scale compensation brightness value corresponding to the frame of images to be corrected and the brightness control duty cycle corresponding to the frame of images to be corrected when displaying the frame of images to be corrected are re-determined.

[0149] In some embodiments, the frame of images to be corrected is multiple.

[0150] the fourth processing unit, configured to

[0151] According to the display order of each of the to-be-corrected frame images in the refresh frequency range, the corresponding display brightness when the to-be-corrected frame images are displayed is adjusted in sequence.

[0152] In some embodiments, the acquired gray scale brightness value corresponding to each frame image displayed by each display screen respectively comprises:

[0153] the gray scale brightness value corresponding to each frame image displayed by each display screen respectively; or

[0154] the first gray scale brightness value and the second gray scale brightness value corresponding to each frame image displayed by each display screen respectively, wherein the first gray scale brightness value and the second gray scale brightness value are part of the gray scale brightness values, and the gray scale level corresponding to the second gray scale brightness value is lower than the gray scale level corresponding to the first gray scale brightness value; wherein the gray scale brightness values further include a third gray scale brightness value, and the gray scale level corresponding to the third gray scale brightness value is lower than the gray scale level corresponding to the second gray scale brightness value.

[0155] In the embodiments of the present disclosure, in actual application, to prevent the problems of large dispersion of high and low gray scales, too many test pictures of gray1~gray255 gray scales, and long test time, when collecting screen body brightness data, the high part gray scales can be collected.

[0156] In the present application, the brightness change in 1 frame after compensation is small, and there is no brightness flicker. The implementation is simple, and the EM duty in 1 frame can be fine-tuned through the DDIC display driving chip. No new signal or existing signal action, small impact on power consumption.

[0157] Figure 4 is a screen body brightness verification flowchart in a factory according to an exemplary embodiment. As Figure 4 shown, the screen body brightness verification flowchart in the factory comprises:

[0158] Step 41, collecting frame image display corresponding brightness decay data of a batch of screen bodies;

[0159] Step 42, generating brightness compensation data according to the brightness decay data collected in step 41;

[0160] Step 43, converting the brightness data into a brightness control duty cycle;

[0161] Step 44, verifying the display brightness of the screen body in small batches in the factory based on the brightness control duty cycle;

[0162] Step 45, if the verification is passed, the factory mass produces the application, and if there is a screen body that fails the verification, collects the brightness attenuation data of the screen body that fails the verification as the collection data of step 41.

[0163] The embodiments of the present disclosure further provide an electronic device, comprising a processor and a memory, wherein the memory has stored a computer program capable of running on the processor, and the processor is configured to run the computer program to execute the steps of the method according to the embodiments.

[0164] The embodiments of the present disclosure further provide a computer readable storage medium having stored a computer program, wherein the computer program is configured to be executed by a processor to implement the steps of the method according to the embodiments.

[0165] Figure 6 is a device block diagram of an electronic device according to an exemplary embodiment. The electronic device device can be a mobile phone, a computer, a digital broadcast electronic device, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0166] Referring to Figure 6 , the electronic device device can include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0167] The processing component 802 usually controls overall operations of the electronic device device, such as operations associated with touch, phone calls, data communications, camera operations, and recording operations. The processing component 802 can include one or more processors 820 to execute instructions to complete all or part of steps of the methods described above. In addition, the processing component 802 can include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.

[0168] The memory 804 is configured to store various types of data to support operations of the electronic device device. Examples of these data include instructions for any application or method operating on the electronic device device, contact data, phonebook data, messages, pictures, videos, etc. The memory 804 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0169] The power component 806 provides power to various components of the electronic device. The power component 806 can include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the electronic device.

[0170] The multimedia component 808 includes a screen providing an output interface between the electronic device and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes the touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding action. In some embodiments, the multimedia component 808 includes a front camera and / or a rear camera. When the electronic device is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capability.

[0171] The audio component 810 is configured to output and / or input an audio signal. For example, the audio component 810 includes a microphone (MIC) configured to receive an external audio signal when the electronic device is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 also includes a speaker for outputting an audio signal.

[0172] The I / O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which can be a keypad, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0173] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of the electronic device. For example, sensor assembly 814 can detect the on / off state of the electronic device, the relative positioning of components such as the display and keypad of the electronic device, changes in the position of the electronic device or a component of the electronic device, the presence or absence of user contact with the electronic device, orientation or acceleration / deceleration of the electronic device, and temperature changes of the electronic device. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, or a temperature sensor.

[0174] Communication component 816 is configured to facilitate wired or wireless communication between electronic devices and other devices. The electronic devices can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0175] In an exemplary embodiment, the electronic device may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0176] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0177] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for correcting the brightness of a display screen, characterized in that, include: When multiple display screens display frame images within the refresh rate range, obtain the grayscale brightness values ​​corresponding to each frame image displayed on each display screen. Based on the grayscale brightness values ​​corresponding to each frame of image displayed on each display screen, the average grayscale brightness value corresponding to the standard frame image and the grayscale compensation brightness value corresponding to the frame image to be corrected are determined. The standard frame image is a frame image with a determined grayscale brightness within the refresh frequency range, and the frame image to be corrected is a frame image to be displayed with brightness to be corrected within the refresh frequency range. The average grayscale brightness value corresponding to the standard frame image is the average of multiple grayscale brightness values ​​corresponding to multiple display screens when displaying the standard frame image, and the grayscale compensation brightness value corresponding to the frame image to be corrected is the grayscale brightness value to be compensated corresponding to the display screen to be corrected when displaying the frame image to be corrected. Based on the grayscale compensation brightness value corresponding to the frame image to be corrected, the average grayscale brightness value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed, the brightness control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected is determined. Based on the determined brightness control duty cycle of the frame image to be corrected, the display brightness corresponding to the display screen displaying the frame image to be corrected is adjusted.

2. The display screen brightness correction method according to claim 1, characterized in that, The step of determining the grayscale compensation brightness value corresponding to the frame image to be corrected based on the grayscale brightness values ​​corresponding to each frame image displayed on each display screen includes: Based on the grayscale brightness values ​​corresponding to each frame of image displayed on each display screen, the average grayscale brightness value corresponding to the frame image to be corrected is determined, as well as the correlation between the average grayscale brightness value corresponding to the frame image to be corrected and the grayscale compensation brightness value corresponding to the frame image to be corrected; wherein, the average grayscale brightness value corresponding to the frame image to be corrected is the average of multiple grayscale brightness values ​​corresponding to the multiple display screens when displaying the frame image to be corrected before brightness correction; Based on the correlation between the average grayscale brightness of the frame image to be corrected and the grayscale compensation brightness value of the frame image to be corrected, and the average grayscale brightness of the frame image to be corrected, the grayscale compensation brightness value corresponding to the display screen to be corrected when displaying the frame image to be corrected is obtained.

3. The display screen brightness correction method according to claim 2, characterized in that, The association relationship includes at least a linear correlation; The method of determining the correlation between the average grayscale brightness value of the frame image to be corrected and the grayscale compensation brightness value of the frame image to be corrected, based on the grayscale brightness values ​​corresponding to each frame image displayed on each display screen, includes at least the following: Based on the grayscale brightness values ​​corresponding to each frame of image displayed on each display screen, the average grayscale brightness and average grayscale brightness difference corresponding to each grayscale when displaying the frame image to be corrected are determined; wherein, the average grayscale brightness corresponding to a grayscale is determined as the average brightness value of the same grayscale when multiple display screens display the frame image to be corrected; the average grayscale brightness difference corresponding to a grayscale is determined as the average difference between the brightness values ​​corresponding to the same grayscale when multiple display screens display the frame image to be corrected and when displaying the standard frame image; The least squares method is used to linearly fit the mean gray level brightness difference and the sum of squared residuals of the mean gray level brightness to the mean gray level brightness, and the fitting parameters are used to determine the linear correlation between the mean gray level brightness of the frame image to be corrected and the gray level compensation brightness value of the frame image to be corrected.

4. The display screen brightness correction method according to claim 1, characterized in that, Based on the grayscale compensation brightness value corresponding to the frame image to be corrected, the average grayscale brightness value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed, the brightness control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected is determined, including at least: Based on the grayscale compensation brightness value corresponding to the frame image to be corrected, the average grayscale brightness value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed, the duty cycle change of the brightness control duty cycle when the display screen to be corrected displays the frame image to be corrected relative to the brightness control duty cycle when the standard frame image is displayed is determined. Based on the change in duty cycle and the brightness control duty cycle when the standard frame image is displayed, the brightness control duty cycle corresponding to the display screen to be corrected when displaying the frame image to be corrected is determined.

5. The display screen brightness correction method according to claim 1, characterized in that, The step of adjusting the display brightness of the display screen when displaying the frame image to be corrected, based on the determined brightness control duty cycle of the frame image to be corrected, includes: If the display brightness of the display screen to be calibrated does not reach the predetermined brightness value when the frame image to be calibrated is displayed after adjusting the brightness control duty cycle of the frame image to be calibrated, then the grayscale brightness values ​​corresponding to each frame image displayed by the display screen to be calibrated are collected. Based on the collected grayscale brightness values ​​corresponding to each frame of the image displayed on the screen to be calibrated, the grayscale compensation brightness value corresponding to the frame image to be calibrated and the brightness control duty cycle corresponding to the frame image to be calibrated when it is to be displayed are re-determined.

6. The display screen brightness correction method according to claim 1, characterized in that, The frame images to be corrected are multiple; The step of adjusting the display brightness of the display screen when displaying the frame image to be corrected, based on the determined brightness control duty cycle of the frame image to be corrected, includes at least the following: According to the display order of each frame image to be corrected within the refresh frequency range, the display brightness of each frame image to be corrected is adjusted sequentially.

7. The display screen brightness correction method according to claim 1, characterized in that, The acquired grayscale brightness values ​​corresponding to each frame of image displayed on each display screen include: The grayscale brightness values ​​corresponding to each frame of image displayed on each display screen; or... Each display screen displays a first grayscale brightness value and a second grayscale brightness value corresponding to each frame of image. The first grayscale brightness value and the second grayscale brightness value are both partial grayscale brightness values ​​among the grayscale brightness values, and the grayscale level corresponding to the second grayscale brightness value is lower than the grayscale level corresponding to the first grayscale brightness value. The grayscale brightness values ​​also include a third grayscale brightness value, and the grayscale level corresponding to the third grayscale brightness value is lower than the grayscale level corresponding to the second grayscale brightness value.

8. A display screen brightness correction device, characterized in that, include: The first processing unit is used to obtain the grayscale brightness value corresponding to each frame image displayed on each display screen when multiple display screens display frame images within the refresh frequency range. The second processing unit is used to determine the average grayscale brightness value corresponding to the standard frame image and the grayscale compensation brightness value corresponding to the frame image to be corrected based on the grayscale brightness values ​​corresponding to each frame image displayed on each display screen. The standard frame image is a frame image with a determined grayscale brightness within the refresh frequency range, and the frame image to be corrected is a frame image to be displayed with brightness to be corrected within the refresh frequency range. The average grayscale brightness value corresponding to the standard frame image is the average of multiple grayscale brightness values ​​corresponding to each of the multiple display screens when displaying the standard frame image, and the grayscale compensation brightness value corresponding to the frame image to be corrected is the grayscale brightness value to be compensated corresponding to the display screen to be corrected when displaying the frame image to be corrected. The third processing unit is used to determine the brightness control duty cycle corresponding to the display screen displaying the frame image to be corrected based on the grayscale compensation brightness value corresponding to the frame image to be corrected, the average grayscale brightness value corresponding to the standard frame image, and the brightness control duty cycle when the standard frame image is displayed. The fourth processing unit is used for output.

9. An electronic device, characterized in that, include: A processor and a memory for storing a computer program capable of running on the processor, wherein the processor, when running the computer program, performs the steps of the method according to any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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