Luminescence control method for improving high contrast interference
By dividing the image into multiple sub-screens and arranging them in different display orders, and inserting sub-screens without assigned grayscale, the problem of inaccurate grayscale display on high-contrast images is solved, thus improving image quality.
Patent Information
- Application Number
- CN202510646307.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-06-11
- Filing Date
- 2025-05-20
- Publication Date
- 2025-12-12
AI Technical Summary
When a display device presents a high-contrast image, the coupling effect caused by the difference in grayscale values of different light-emitting elements on the same scan line leads to inaccurate grayscale display.
By dividing the image into multiple sub-screens and arranging different display orders for each sub-screen group, inserting sub-screens without assigned grayscale, and controlling the light-emitting elements to display different sub-screens in different sub-display time periods, the coupling effect caused by grayscale differences is reduced.
It effectively improves the grayscale display accuracy of display devices under high-contrast images, reduces the coupling effect between light-emitting elements, and enhances image quality.
Smart Images
Figure CN121122172A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for controlling an electronic device, and more particularly to a method for controlling the light emission of a display device. Background Technology
[0002] See Figure 1 The image is divided into eight sub-screens numbered 1 to 8, and is sequentially displayed in eight sub-display time periods numbered T1 to T8. C1 to C4 are defined as the first to fourth channels, respectively, and S1 to S2 are defined as the first and second scan lines, respectively. Each channel and each scan line are electrically connected through a light-emitting element that can display grayscale values in the range of 0 to F, where F represents the maximum grayscale value that the light-emitting element can display. When the grayscale value of the image screen corresponding to the four light-emitting elements of the first channel C1 to the fourth channel C4 on the first scan line S1 is (1, 1, 1, 1), and the grayscale value of the image screen corresponding to the four light-emitting elements of the first channel C1 to the fourth channel C4 on the second scan line S2 is (1, 0, 0, 0), then the sub-screen number 1 displays four partial grayscale values of (1, 1, 1, 1) on the four light-emitting elements of the first channel C1 to the fourth channel C4 on the first scan line S1, and four partial grayscale values of (1, 0, 0, 0) on the four light-emitting elements of the first channel C1 to the fourth channel C4 on the second scan line S2. The partial grayscale value assigned to each light-emitting element in the sub-screen number 2 to the sub-screen number 8 is 0. When the grayscale value of the image image corresponding to the four light-emitting elements of the first channel C1 to the fourth channel C4 on the first scan line S1 is (1, 1, 1, 1), and the grayscale value of the image image corresponding to the four light-emitting elements of the first channel C1 to the fourth channel C4 on the second scan line S2 is (1, F, F, F), then sub-image number 1 displays four parts of grayscale value (1, 1, 1, 1) on the first scan line S1 corresponding to the four light-emitting elements of the first channel C1 to the fourth channel C4, and displays four parts of grayscale value (1, f, f, f) on the second scan line S2. Sub-image number 2 displays four parts of grayscale value (0, 0, 0, 0) on the first scan line S1 corresponding to the four light-emitting elements of the first channel C1 to the fourth channel C4, and displays four parts of grayscale value (0, f, f, f) on the second scan line S2. The display method of each subsequent sub-image follows the same principle.
[0003] When the image is a high-contrast image, meaning that the grayscale values displayed by different light-emitting elements in different channels of the same scan line differ significantly (e.g., some grayscale values of the light-emitting elements in the first channel of the same scan line are 1, while some grayscale values of the light-emitting elements in the second channel are F), the scan line needs to provide different magnitudes of current signals for different grayscale values. During the change of the current signal, different light-emitting elements on the same scan line will be affected by the coupling effect caused by the change in the current signal, resulting in the actual current value received by the light-emitting element not being equal to the original current signal. This leads to a discrepancy between the grayscale value actually displayed by the light-emitting element and the original grayscale value of the image. This type of high-contrast interference phenomenon results in poor picture quality of the display device. Summary of the Invention
[0004] The purpose of this invention is to provide a light emission control method to improve the inaccuracy of grayscale display when a display device presents a high-contrast image.
[0005] The present invention provides a light emission control method for improving the problem of inaccurate grayscale display when a display device presents a high-contrast image. The method is executed by a driving circuit to control a display including multiple light-emitting elements. The light emission control method includes steps (A) to (D).
[0006] Step (A): The driving circuit receives an image frame and divides the image frame into M sub-frames, where the M sub-frames include the first sub-frame to the Mth sub-frame, and M = 2. B +C=(N+E)+C, B>0, N>0, C≥0 and E≥0, these N sub-screens are the 2 B The E sub-images that need to be assigned grayscale are the 2 sub-images. B The C sub-screens that do not have grayscale assigned are the C sub-screens excluding the 2. B In addition to the existing sub-screen, there is an additional sub-screen without grayscale assignment. This image screen corresponds to a display time period, which includes M sub-display time periods.
[0007] In step (B), the driving circuit divides the light-emitting element into several sub-screen arrangement groups, each of which includes one or more light-emitting elements.
[0008] In step (C), the driving circuit arranges a display order consisting of the M sub-screens for each sub-screen arrangement group. Each display order is different, and the M sub-screens correspond to the M sub-display time periods in each display order.
[0009] In step (D), during each sub-display time period, the driving circuit controls the light-emitting element to display one of the M sub-screens corresponding to the sub-display time period according to the display order to which each sub-screen arrangement group is assigned.
[0010] The light emission control method of this invention, 0≤C≤2 B And 0≤E≤(2 B -1).
[0011] In the light emission control method of this invention, B, N, C, and E are all integers. When the driving circuit allocates the image frame as the M sub-frames, it includes the following four states:
[0012] (a) When C = 0 and E = 0, the image is divided into N sub-images.
[0013] (b) If C = 0 and E > 0, the image is divided into (N + E) sub-images.
[0014] (c) If C > 0 and E = 0, the image is divided into (N+C) sub-images.
[0015] (d) If C>0 and E>0, the image is divided into (N+E+C) sub-images.
[0016] The present invention provides a light emission control method in which the driving circuit assigns a grayscale value to each light emission element according to the image frame, and assigns the grayscale value to the first sub-frame to the Nth sub-frame among the M sub-frames.
[0017] The light emission control method of the present invention divides each grayscale value of the screen into N partial grayscale values, and allocates one partial grayscale value at a time from the first sub-screen to the Nth sub-screen. Each partial grayscale value is less than or equal to a grayscale preset value.
[0018] In the light emission control method of the present invention, when allocating a portion of grayscale values to one of the N sub-screens, if the remaining portion of grayscale values of the screen that has not yet been allocated is greater than or equal to the preset grayscale value, then the portion of grayscale values is equal to the preset grayscale value; if the remaining portion of grayscale values of the screen that has not yet been allocated is less than the preset grayscale value, then the portion of grayscale values is equal to the remaining portion of grayscale values of the screen that has not yet been allocated.
[0019] In the light emission control method of the present invention, each grayscale value of the frame is composed of A bits, and for each sub-frame, the portion of the grayscale value of each light-emitting element allocated to the sub-frame is no more than 2. A / N.
[0020] In the light emission control method of the present invention, each of the first sub-screens in the sub-screen arrangement group corresponds to a different sub-display time period.
[0021] In the light emission control method of the present invention, the E sub-screens and the C sub-screens are not assigned grayscale values, and the grayscale values of the E sub-screens and the C sub-screens are 0.
[0022] The beneficial effects of this invention are as follows: the driving circuit divides the image into M sub-images and assigns them to be displayed in the M sub-images. The light-emitting elements are divided into several sub-image arrangement groups, each sub-image arrangement group corresponding to a different display order. By displaying different sub-images in each sub-display time period and inserting sub-images without assigned grayscale, the coupling effect caused by excessive grayscale differences between different light-emitting elements is reduced, thereby improving the inaccurate grayscale display when the display device presents high-contrast images. Attached Figure Description
[0023] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings:
[0024] Figure 1 It is a timing diagram of the display order of sub-screens in existing technology;
[0025] Figure 2 This is a circuit diagram of the display used in the light emission control method of the present invention;
[0026] Figure 3 This is a flowchart illustrating the implementation of the light emission control method of the present invention;
[0027] Figure 4 This is a timing diagram of the sub-screen display sequence in the first embodiment of the light emission control method of the present invention;
[0028] Figure 5 This is a timing diagram of the sub-screen display sequence of the second embodiment of the light emission control method of the present invention;
[0029] Figure 6 This is a timing diagram of the sub-screen display sequence in the third embodiment of the light emission control method of the present invention;
[0030] Figure 7 This is a timing diagram of the sub-screen display sequence in the fourth embodiment of the light emission control method of the present invention;
[0031] Figure 8 This is a timing diagram of the sub-screen display sequence in the fifth embodiment of the light emission control method of the present invention;
[0032] Figure 9 This is a timing diagram of the sub-screen display sequence of the sixth embodiment of the light emission control method of the present invention. Detailed Implementation
[0033] Before the invention is described in detail, it should be noted that similar elements are represented by the same numbers in the following description.
[0034] The light emission control method of the present invention is used to improve the problem of inaccurate grayscale display when a display device presents a high-contrast image. It is executed by a driving circuit 91 to control a display 92 including a plurality of light-emitting elements 921.
[0035] For ease of understanding, each embodiment is illustrated with reference to... Figure 2 The presented form is described. (See also...) Figure 2 The driving circuit 91 includes a first scan line SC1 and a second scan line SC2 controlled by a horizontal scan control circuit, and a first channel CH1, a second channel CH2, a third channel CH3, and a fourth channel CH4 controlled by a constant current circuit. The display 92 includes eight light-emitting elements 921. Each scan line and each channel extends from the driving circuit 91 into the display 92, and each scan line and each channel is electrically connected in the display 92 through one of the light-emitting elements 921.
[0036] See Figure 3 The light emission control method of the present invention is executed by the driving circuit 91 and includes steps (A) to (D).
[0037] Step (A): The driving circuit 91 receives an image frame and divides the image frame into M sub-frames, including the first sub-frame to the Mth sub-frame, where M = 2. B +C=(N+E)+C, where B and N are positive integers, C and E are positive integers or 0, and 0≤C≤2 B And 0≤E≤(2 B -1). The N sub-screens are the 2 B The sub-screens that need to be assigned grayscale values must have grayscale values greater than or equal to 0. These E sub-screens are the 2... B Sub-pictures that are not assigned a grayscale value will have a grayscale value of 0. These C sub-pictures are excluding the 2... B In addition to the existing sub-screen, there is an additional sub-screen without assigned grayscale, with a grayscale value of 0. This image screen corresponds to a display time period, which includes M sub-display time periods. See also Figure 4 In the first embodiment of the light emission control method of the present invention, B=3, C=0 and E=0, therefore N=8, M=8+0+0=8. The image screen is divided into eight sub-screens, corresponding to the display time period including the eight sub-display time periods.
[0038] In step (B), the driving circuit 91 divides the light-emitting element 921 into several sub-screen arrangement groups, each sub-screen arrangement group including one or more of the light-emitting elements 921. See also... Figure 2 For ease of understanding, in each embodiment, the light-emitting element 921 on the first channel CH1 and the light-emitting element 921 on the third channel CH3 are used as a first sub-screen arrangement group 11, and the light-emitting element 921 on the second channel CH2 and the light-emitting element 921 on the fourth channel CH4 are used as a second sub-screen arrangement group 12, and the grayscale preset value is a numerical value f for explanation.
[0039] The driving circuit 91 assigns a grayscale value to each light-emitting element 921 based on the image frame, and then divides each grayscale value into N partial grayscale values, each partial grayscale value being less than or equal to a preset grayscale value. The partial grayscale values are sequentially assigned from the first sub-frame to the Nth sub-frame. When assigning a partial grayscale value to one of the N sub-frames, if the unassigned portion of the image grayscale value is greater than or equal to the preset grayscale value, then the partial grayscale value is equal to the preset grayscale value; if the unassigned portion of the image grayscale value is less than the preset grayscale value, then the partial grayscale value is equal to the unassigned portion of the image grayscale value. Each image grayscale value consists of A bits, and for each sub-frame, the portion of the image grayscale value of each light-emitting element 921 assigned to each sub-frame is no greater than 2. A / N. Therefore, 0 ≤ partial grayscale values ≤ 2. A / N, 1≤grayscale preset value≤2 A / N.
[0040] In step (C), the driving circuit 91 arranges a display order consisting of the M sub-screens for each sub-screen arrangement group. Each display order is different, and the M sub-screens correspond to M sub-display time periods in each display order. The first sub-screen of each sub-screen arrangement group corresponds to a different sub-display time period. The implementation of the display order is characterized by differences in the order of sub-screens between different sub-screen arrangement groups, while the order of sub-screens of each light-emitting element 921 within the same sub-screen arrangement group is consistent. (See reference...) Figure 4 The display order of the first sub-screen arrangement group 11 is 12345678, and the display order of the second sub-screen arrangement group 12 is 87654321. The numbers 1 to 8 are defined as the first sub-screen to the eighth sub-screen, respectively.
[0041] In step (D), during each sub-display time period, the driving circuit 91 controls the light-emitting element 921 to display one of the M sub-screens corresponding to the sub-display time period according to the display order to which each sub-screen arrangement group is assigned.
[0042] See Figure 4 In this embodiment, the image grayscale value of the four light-emitting elements corresponding to the first channel CH1 to the fourth channel CH4 on the first scan line SC1 is (1, 1, 1, 1), and the image grayscale value of the four light-emitting elements corresponding to the first channel CH1 to the fourth channel CH4 on the second scan line SC2 is (1, 0, 0, 0). During the first sub-display time period, the first sub-screen arrangement group 11 displays the first sub-screen, and the second sub-screen arrangement group 12 displays the eighth sub-screen. That is, during the first sub-display time period, the first scan line SC1 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with a grayscale value of (1, 0, 1, 0), and the second scan line SC2 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with a grayscale value of (1, 0, 0, 0). During the second sub-display time period, the first sub-screen arrangement group 11 displays the second sub-screen, and the second sub-screen arrangement group 12 displays the seventh sub-screen. That is, during the second sub-display time period, the first scan line SC1 displays the grayscale values (0, 0, 0, 0) for the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4, and the second scan line SC2 displays the grayscale values (0, 0, 0, 0) for the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4. The display method follows the same pattern in each subsequent sub-display time period. After eight sub-display time periods, the display 92 completes the display of the image. By displaying different sub-screens in each sub-screen arrangement group within the same sub-display time period, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thus solving the problems encountered in the prior art.
[0043] See Figure 5 In the second embodiment of the light emission control method of the present invention, B=3, C=1 and E=0, therefore N=8 and M=8+0+1=9. The image is divided into nine sub-images, corresponding to the display time period including the nine sub-display time periods.
[0044] The display order of the first sub-screen arrangement group 11 is 123456789, and the display order of the second sub-screen arrangement group 12 is 987654321. The numbers 1 to 9 are defined as the first sub-screen to the ninth sub-screen, respectively.
[0045] During the first sub-display time period, the first sub-screen arrangement group 11 displays the first sub-screen, and the second sub-screen arrangement group 12 displays the ninth sub-screen. That is, during the first sub-display time period, the first scan line SC1 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, 1, 0), and the second scan line SC2 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, 0, 0). During the second sub-display time period, the first sub-screen arrangement group 11 displays the second sub-screen, and the second sub-screen arrangement group 12 displays the eighth sub-screen. That is, during the second sub-display time period, the first scan line SC1 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, 0, 0, 0), and the second scan line SC2 displays the same grayscale values. This display method continues in each subsequent sub-display time period. After nine sub-display time periods, the display 92 completes the display of the image. By displaying different sub-screens in each sub-screen arrangement group within the same sub-display time period and inserting sub-screens without assigned grayscale values, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thus solving the problems encountered in the prior art.
[0046] See Figure 6 In the third embodiment of the light emission control method of the present invention, B=3, C=1 and E=0, therefore N=8, M=8+0+1=9, and it is roughly the same as the second embodiment. The difference is that the image screen displays the grayscale values (1, F, F, F) of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 on the second scan line SC2.
[0047] During the first sub-display time period, the first sub-screen arrangement group 11 displays the first sub-screen, and the second sub-screen arrangement group 12 displays the ninth sub-screen. That is, during the first sub-display time period, the first scan line SC1 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, 1, 0), and the second scan line SC2 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, f, 0). During the second sub-display time period, the first sub-screen arrangement group 11 displays the second sub-screen, and the second sub-screen arrangement group 12 displays the eighth sub-screen. That is, during the second sub-display time period, the first scan line SC1 displays four partial grayscale values (0, 0, 0, 0) for the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4, and the second scan line SC2 displays four partial grayscale values (0, f, f, f) for the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4. The display method follows the same pattern in each subsequent sub-display time period. After nine sub-display time periods, the display 92 completes the display of the image. By displaying different sub-screens in each sub-screen arrangement group within the same sub-display time period and inserting sub-screens without assigned grayscale values, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thus solving the problems encountered in the prior art.
[0048] See Figure 7 In the fourth embodiment of the light emission control method of the present invention, B=3, C=1 and E=0, therefore N=8, M=8+0+1=9, and it is roughly the same as the third embodiment. The difference is that the display order of the first sub-screen arrangement group 11 is 123456798, and the display order of the second sub-screen arrangement group 12 is 897654321.
[0049] During the first sub-display time period, the first sub-screen arrangement group 11 displays the first sub-screen, and the second sub-screen arrangement group 12 displays the eighth sub-screen. That is, during the first sub-display time period, the first scan line SC1 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, 1, 0), and the second scan line SC2 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, f, f, f). During the second sub-display time period, the first sub-screen arrangement group 11 displays the second sub-screen, and the second sub-screen arrangement group 12 displays the ninth sub-screen. That is, during the second sub-display time period, the first scan line SC1 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, 0, 0, 0), and the second scan line SC2 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, 0, f, 0). The display method follows the same pattern in each subsequent sub-display time period. After nine sub-display time periods, the display 92 completes the display of the image. By displaying different sub-screens in each sub-screen arrangement group within the same sub-display time period and inserting sub-screens without assigned grayscale values, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thus solving the problems encountered in the prior art.
[0050] See Figure 8 In the fifth embodiment of the light emission control method of the present invention, B=3, C=0 and E=1, therefore N=7 and M=7+1+0=8. The image is divided into eight sub-images, each sub-image is not assigned a grayscale level, and corresponds to the display time period including the eight sub-display time periods.
[0051] The display order of the first sub-screen arrangement group 11 is 12345678, and the display order of the second sub-screen arrangement group 12 is 87654321. The numbers 1 to 8 are defined as the first sub-screen to the eighth sub-screen, respectively.
[0052] During the first sub-display time period, the first sub-screen arrangement group 11 displays the first sub-screen, and the second sub-screen arrangement group 12 displays the eighth sub-screen. That is, during the first sub-display time period, the first scan line SC1 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, 1, 0), and the second scan line SC2 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, f, 0). During the second sub-display time period, the first sub-screen arrangement group 11 displays the second sub-screen, and the second sub-screen arrangement group 12 displays the seventh sub-screen. That is, during the second sub-display time period, the first scan line SC1 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, 0, 0, 0), and the second scan line SC2 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, f, f, f). The display method follows the same pattern in each subsequent sub-display time period. After the eight sub-display time periods, the display 92 completes the display of the image. By displaying different sub-screens in each sub-screen arrangement group within the same sub-display time period and inserting sub-screens without assigned grayscale values, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thus solving the problems encountered in the prior art.
[0053] See Figure 9 In the sixth embodiment of the light emission control method of the present invention, B=3, C=1 and E=1, therefore N=7 and M=7+1+1=9. The image is divided into nine sub-images, two sub-images are not assigned gray levels, and each sub-image corresponds to a display time period including the nine sub-display time periods.
[0054] The display order of the first sub-screen arrangement group 11 is 123456789, and the display order of the second sub-screen arrangement group 12 is 987654321. The numbers 1 to 9 are defined as the first sub-screen to the ninth sub-screen, respectively.
[0055] During the first sub-display time period, the first sub-screen arrangement group 11 displays the first sub-screen, and the second sub-screen arrangement group 12 displays the ninth sub-screen. That is, during the first sub-display time period, the first scan line SC1 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, 1, 0), and the second scan line SC2 displays the grayscale values of the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 as (1, 0, f, 0). During the second sub-display time period, the first sub-screen arrangement group 11 displays the second sub-screen, and the second sub-screen arrangement group 12 displays the eighth sub-screen. That is, during the second sub-display time period, the first scan line SC1 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, 0, 0, 0), and the second scan line SC2 displays the four light-emitting elements 921 corresponding to the first channel CH1 to the fourth channel CH4 with four partial grayscale values of (0, 0, f, 0). The display method follows the same pattern in each subsequent sub-display time period. After nine sub-display time periods, the display 92 completes the display of the image. By displaying different sub-screens in each sub-screen arrangement group within the same sub-display time period and inserting sub-screens without assigned grayscale values, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thus solving the problems encountered in the prior art.
[0056] In summary, the driving circuit 91 divides the image into M sub-screens corresponding to M sub-display time periods, and divides the grayscale value of the image received by each light-emitting element 921 into N partial grayscale values, which are then assigned to the N sub-screens within the M sub-screens for display. The light-emitting elements 921 are divided into several sub-screen arrangement groups, each corresponding to a different display order. By displaying different sub-screens in each sub-display time period within the same arrangement group, and inserting sub-screens without assigned grayscale values according to the settings of parameters C and E, the coupling effect caused by excessive grayscale differences between different light-emitting elements 921 is reduced, thereby improving the accuracy of grayscale display when the display device presents high-contrast images.
[0057] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.
Claims
1. A light emission control method for improving the problem of inaccurate grayscale display when a display device presents a high-contrast image, wherein the method is executed by a driving circuit to control a display comprising a plurality of light-emitting elements, characterized in that, The light emission control method includes: (A) The driving circuit receives an image frame and divides the image frame into M sub-frames, where the M sub-frames include the first sub-frame to the Mth sub-frame, and M = 2. B +C=(N+E)+C, B>0, N>0, C≥0 and E≥0, these N sub-screens are the 2 B The E sub-images that need to be assigned grayscale are the 2 sub-images. B The C sub-screens that do not have grayscale assigned are the C sub-screens excluding the 2. B In addition to the existing sub-screen, there is an additional sub-screen without grayscale assignment. This image screen corresponds to a display time period, which includes M sub-display time periods. (B) The driving circuit divides the light-emitting element into several sub-screen arrangement groups, each of which includes one or more light-emitting elements; (C) The driving circuit arranges a display sequence consisting of the M sub-screens for each sub-screen arrangement group, and each display sequence is different. The M sub-screens in each display sequence correspond to the M sub-display time periods. (D) During each of the sub-display time periods, the driving circuit controls the light-emitting element to display one of the M sub-screens corresponding to the sub-display time period according to the display order to which each sub-screen arrangement group is assigned.
2. The light emission control method according to claim 1, characterized in that, 0≤C≤2 B And 0≤E≤(2 B -1).
3. The light emission control method according to claim 1, characterized in that, B, N, C, and E are all integers. When the driving circuit allocates the image frame into the M sub-frames, it includes the following four situations: (a) When C = 0 and E = 0, the image is divided into N sub-images. (b) If C = 0 and E > 0, the image is divided into (N + E) sub-images. (c) If C > 0 and E = 0, the image is divided into (N+C) sub-images. (d) If C>0 and E>0, the image is divided into (N+E+C) sub-images.
4. The light emission control method according to claim 3, characterized in that, The driving circuit assigns a grayscale value to each of the light-emitting elements according to the image, and assigns the grayscale value to the first sub-image to the Nth sub-image among the M sub-images.
5. The light emission control method according to claim 4, characterized in that, The driving circuit divides each grayscale value of the image into N grayscale values, and assigns one grayscale value at a time, starting from the first sub-image and sequentially up to the Nth sub-image. Each grayscale value is less than or equal to a preset grayscale value.
6. The light emission control method according to claim 5, characterized in that, When assigning the grayscale value to one of the N sub-screens, if the remaining portion of the grayscale value that has not yet been assigned is greater than or equal to the grayscale preset value, then the grayscale value is equal to the grayscale preset value. If the remaining portion of the grayscale value that has not yet been assigned is less than the grayscale preset value, then the grayscale value is equal to the remaining portion of the grayscale value that has not yet been assigned.
7. The light emission control method according to any one of claims 4 to 6, characterized in that, Each grayscale value of the image consists of A bits, and for each sub-image, the portion of the grayscale value of each light-emitting element allocated to that sub-image is no more than 2. A / N.
8. The light emission control method according to claim 1, characterized in that, Each sub-screen group has a first sub-screen that corresponds to a different sub-display time period.
9. The light emission control method according to claim 1, characterized in that, The E sub-screens and the C sub-screens are not assigned grayscale values, and the grayscale values of the E sub-screens and the C sub-screens are 0.