Screen brightness acquisition method, display panel and electronic equipment

Abstract

The invention discloses a screen brightness acquisition method, a display panel and electronic equipment, and belongs to the field of screen display. The screen is divided into a plurality of subareas, and the subareas comprise a target subarea provided with a photoelectric sensor; the method comprises the steps that under the condition that a dimming closing interval and a dimming opening interval of pulse width modulation alternately pass through partitions in the first direction, first brightness detected by a photoelectric sensor when the dimming closing interval passes through a target partition and second brightness detected by the photoelectric sensor when the dimming opening interval passes through the target partition are obtained respectively; and according to the first brightness and the second brightness, calculating to obtain the screen light leakage brightness of each target partition.

Description

Technical Field

[0001] The present application belongs to the field of screen display, and specifically relates to a method for obtaining screen brightness, a display panel and an electronic device. Background Art

[0002] Screen brightness adjustment through pulse width modulation (PWM) is a technical solution applied in the field of screen display.

[0003] In the related art, a hole is opened on the back of the screen, and a photoelectric sensor is set under the hole. The photoelectric sensor measures the brightness of the PWM dimming intervals that pass through the hole area in the screen in sequence, obtains the screen brightness, and further adjusts the screen brightness.

[0004] However, different areas of the entire screen have different physical properties, which leads to differences in brightness display in different areas. The relevant technology only measures the brightness of the opening area behind the screen, which makes it difficult to characterize the brightness of the entire screen, making the obtained screen brightness inaccurate, resulting in inaccurate final screen brightness adjustment. Summary of the invention

[0005] The purpose of the embodiment of the present application is to provide a method for obtaining screen brightness, which can solve the problem of inaccurately obtaining screen brightness in the related art.

[0006] In a first aspect, an embodiment of the present application provides a method for obtaining brightness of a screen, wherein the screen is divided into a plurality of partitions, wherein the partitions include a target partition in which a photoelectric sensor is provided, and the method includes:

[0007] When the dimming-off interval and the dimming-on interval of the pulse width modulation alternately pass through the partition along the first direction, respectively acquiring a first brightness detected by the photoelectric sensor when the dimming-off interval passes through the target partition, and a second brightness detected by the photoelectric sensor when the dimming-on interval passes through the target partition;

[0008] Calculate and obtain the screen light leakage brightness of each target partition according to the first brightness and the second brightness;

[0009] The overall brightness of the entire screen is calculated and obtained through the screen light leakage brightness of each target partition.

[0010] In a second aspect, an embodiment of the present application provides a display panel for implementing the method according to the first aspect, the display panel comprising: a screen, a circuit board, and a photoelectric sensor;

[0011] The screen corresponds to the circuit board, the back side of the screen is divided into a plurality of partitions along a first direction, and the photoelectric sensor is arranged in an area where at least part of the target partition is projected onto the circuit board; the photoelectric sensor is used to detect the first brightness and the second brightness generated by pulse width modulation; the circuit board includes a brightness calculation unit; the brightness calculation unit is used to calculate and obtain the overall brightness of the screen based on the first brightness and the second brightness.

[0012] In a third aspect, an embodiment of the present application provides an electronic device, which includes the display panel as described in the second aspect.

[0013] In summary, in the embodiment of the present application, the screen is divided into multiple partitions, and the target partitions in the partitions are configured with photoelectric sensors; in conjunction with the dimming-off interval and the dimming-on interval of the pulse width modulation that alternately passes through the partitions, the photoelectric sensor can accurately obtain the first brightness and the second brightness of each target partition, and the precise screen leakage brightness of the target partition can be calculated through the first brightness and the second brightness, and the precise overall brightness of the entire screen can be further obtained by comprehensively calculating the screen leakage brightness of all target partitions; compared with the related technology that only measures the brightness of the opening area behind the screen, the screen partition of the embodiment of the present application, the photoelectric sensor is set in the target partition, and the technical solution of obtaining the overall brightness of the entire screen by combining the measurement results of multiple photoelectric sensors can include all areas of the screen, eliminate the interference of the screen brightness display difference, so that the final result can better represent the actual situation of the entire screen, and improve the accuracy of screen brightness detection and acquisition, which is conducive to the subsequent accurate closed-loop adjustment of the screen brightness according to the screen brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flowchart of a method for obtaining screen brightness provided by an embodiment of the present application;

[0015] Figure 2 is a top view schematic diagram of pulse width modulation of a screen in an embodiment of the present application;

[0016] Figure 3 is a flowchart of an example of a method for obtaining screen brightness provided in an embodiment of the present application;

[0017] Figure 4 yes Figure 3 A schematic diagram of the partitions of an example of a method for obtaining screen brightness provided;

[0018] Figure 5 yes Figure 3 A schematic diagram of an example of a method for obtaining screen brightness is provided;

[0019] Figure 6is a flowchart of another example of a method for obtaining screen brightness provided in an embodiment of the present application;

[0020] Figure 7 yes Figure 6 Schematic diagram of the partition of the example of the method for obtaining the brightness of the screen provided

[0021] Figure 8 yes Figure 6 A schematic diagram of an example of a method for obtaining screen brightness is provided;

[0022] Fig. 9 is a flowchart of another example of a method for obtaining screen brightness provided in an embodiment of the present application;

[0023] Fig.10 yes Fig. 9 A schematic diagram of the partitions of an example of a method for obtaining screen brightness provided;

[0024] Fig.11 yes Fig. 9 A schematic diagram of the steps of an example of a method for obtaining screen brightness is provided;

[0025] Fig.12 is a schematic diagram of a side cross-sectional structure of a display panel provided in an embodiment of the present application;

[0026] Fig.13 This is a schematic diagram of a light intensity response curve of a photoelectric sensor provided in an embodiment of the present application.

[0027] Fig.14 Another light intensity response curve diagram of the photoelectric sensor provided in the embodiment of the present application is shown in FIG.

[0028] Fig.15 is a schematic diagram of a side cross-sectional structure of another display panel provided in an embodiment of the present application;

[0029] Fig.16 is a schematic diagram of a side cross-sectional structure of another display panel provided in an embodiment of the present application;

[0030] Fig.17 for Fig.16 Schematic diagram of another layout setting of photoelectric sensors;

[0031] Fig.18 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10-screen, 20-circuit board, 30-photoelectric sensor, 40-grid structure, 50-light diffusion film, 60-lighting strip, 70-dimming off interval, 80-dimming on interval, 31-first photoelectric sensor, 32-second photoelectric sensor, 61-first light strip, 62-second light strip, 63-third light strip. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0035] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0036] The following is a detailed description of the method for obtaining the brightness of the screen provided in the embodiment of the present application through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0037] Figure 1 is a flowchart of a method for obtaining screen brightness provided by an embodiment of the present application, wherein the screen is divided into a plurality of partitions, and the partitions include a target partition provided with a photoelectric sensor; Figure 1 , the method may include the following steps:

[0038] Step 101, when the dimming-off interval and the dimming-on interval of the pulse width modulation alternately pass through the partition along the first direction, respectively obtain the first brightness detected by the photoelectric sensor when the dimming-off interval passes through the target partition, and the second brightness detected by the photoelectric sensor when the dimming-on interval passes through the target partition.

[0039] According to the principle of pulse width modulation, the display content of the screen is refreshed on the screen in rows of pixels, so the screen picture of a specific frame is as follows: Figure 2 As shown, Figure 2: is a top view schematic diagram of pulse width modulation of the screen in an embodiment of the present application. A specific frame of the screen includes a plurality of intervals of non-luminous dimming-off intervals and luminous dimming-on intervals. When the screen is refreshed to enter the next frame, it can be observed that the dimming-off interval and the dimming-on interval move along the first direction X. When the dimming-off interval moves to completely cover the detection range of the photoelectric sensor, the photoelectric sensor can accurately detect and obtain the ambient light brightness at the location.

[0040] According to the above-mentioned characteristic principle, the screen in the embodiment of the present application can be configured to be divided into multiple partitions according to the parameters of pulse width modulation, and the partitions include target partitions configured with corresponding photoelectric sensors; by measuring the brightness of each target partition, the screen leakage brightness of each target partition can be obtained, and the overall brightness of the entire screen can be further obtained. Finally, the brightness can be adjusted according to the overall brightness of the entire screen to reduce eye discomfort caused by screen flickering and improve user experience; ideally, the brightness display capability of all areas on the screen should be consistent, but due to the process or display content, there may be brightness display differences in different areas on the screen, and the target partition covers all areas on the entire screen that may have brightness display differences, so that the brightness obtained by the photoelectric sensor from the target partition detection is closer to the actual situation, thereby making the calculation result of the screen brightness more representative; the parameters of pulse width modulation may include the first direction, the width of the dimming off interval, and the width of the dimming on interval.

[0041] The dimming-off interval and the dimming-on interval alternately pass through the area measured by the photoelectric sensor along the first direction. In this regard, the photoelectric sensor will obtain the first brightness and the second brightness respectively. Through the photoelectric sensor of each target partition, the first brightness and the second brightness of each target partition can be obtained, and the next step of calculation can be performed based on this.

[0042] The first direction is the direction of pulse width modulation and the moving direction of the dimming-on interval and the dimming-off interval. For example, the first direction can be from the upper edge of the screen to the lower edge of the screen, or from the lower edge of the screen to the upper edge of the screen.

[0043] In some possible implementations of the embodiments of the present application, a single dimming-off interval can cover a single target partition, and a single dimming-on interval can cover a single target partition; the process of the dimming-off interval passing through the target partition includes the single dimming-off interval moving to cover the target partition, and the process of the dimming-on interval passing through the target partition includes the single dimming-on interval moving to cover the target partition.

[0044] In some other possible implementations of the embodiments of the present application, multiple dimming-off intervals and dimming-on intervals are required to cover a single target partition; the process of the dimming-off interval passing through the target partition includes multiple alternating dimming-off intervals and dimming-on intervals moving to cover the target partition, and the process of the dimming-on interval passing through the target partition includes multiple alternating dimming-off intervals and dimming-on intervals moving to cover the target partition.

[0045] For example, a combination of a dimming-off interval and two adjacent dimming-on intervals can completely cover the target partition, or a combination of a dimming-on interval and two adjacent dimming-off intervals can completely cover the target partition.

[0046] In some other possible implementations of the embodiments of the present application, a single dimming-off interval can cover multiple target partitions, and a single dimming-on interval can cover multiple target partitions; the process of the dimming-off interval passing through the target partition includes the single dimming-off interval moving to cover multiple target partitions at the same time, and the dimming-on interval moving to cover multiple target partitions at the same time.

[0047] For example, the first brightness may be the brightness acquired by the photoelectric sensor when a single dimming-off interval covers the target partition, or may be the brightness acquired by the photoelectric sensor when a plurality of alternating dimming-off intervals and dimming-on intervals cover the target partition.

[0048] For example, the second brightness may be the brightness acquired by the photoelectric sensor when a single dimming-on interval covers the target partition, or may be the brightness acquired by the photoelectric sensor when a plurality of alternating dimming-off intervals and dimming-on intervals cover the target partition.

[0049] By covering the target partition, the dimming off interval or the dimming on interval can cover the detection range of the photoelectric sensor in the target partition, so that the photoelectric sensor will not be disturbed by other light sources during detection, thereby enhancing the accuracy of the first brightness and the second brightness.

[0050] Step 102: Calculate and obtain the screen light leakage brightness of each of the target partitions according to the first brightness and the second brightness.

[0051] After obtaining the first brightness and the second brightness of the target partition, the screen light leakage brightness of the target partition can be obtained based on the calculation, and the screen light leakage brightness represents the brightness of the light emitted by the screen of the target partition.

[0052] Depending on the different methods of obtaining the first brightness and the second brightness, the calculation method of the screen leakage brightness of the target partition may also be different.

[0053] In some possible implementations of the embodiments of the present application, the difference between the first brightness value and the second brightness value can be directly used as the screen light leakage brightness of the target partition.

[0054] In some other possible implementations of the embodiments of the present application, the first brightness value and the second brightness value may be first compounded, and then the result of the compounding operation may be used as the screen leakage brightness of the target partition.

[0055] Step 103, calculating and obtaining the overall brightness of the entire screen through the screen light leakage brightness of each of the target partitions.

[0056] After obtaining the screen leakage brightness of each target partition, the comprehensive calculation result of the screen leakage brightness of all target partitions can be used as the overall leakage brightness of the entire screen. The overall leakage brightness of the entire screen represents the brightness of the light emitted by the entire screen. After obtaining the overall leakage brightness of the entire screen, the overall brightness of the entire screen can be obtained by substituting the screen transmittance. The overall brightness of the entire screen represents the perceived brightness of the entire screen in the user's naked eyes.

[0057] Depending on the different ways of obtaining the screen light leakage brightness of the target partition, the comprehensive calculation of the screen light leakage brightness of all the target partitions may also be different.

[0058] In some possible implementations of the embodiments of the present application, the comprehensive operation may be to add up the screen light leakage intensities of all target partitions, and use the sum as the overall light leakage brightness of the entire screen.

[0059] In some other possible implementations of the embodiments of the present application, the comprehensive operation may be to add up the screen leakage intensities of all target partitions, and use the ratio of the summed result to the number of target partitions as the overall leakage brightness of the entire screen.

[0060] Substituting the screen transmittance can be to obtain the product of the overall light leakage brightness of the entire screen and the screen transmittance, and use the product result as the overall brightness of the entire screen; the screen transmittance characterizes the ability of light to pass through the screen material when the screen displays an image. Different screen materials have different transmittances. For example, for a liquid crystal display (LCD), due to the effects of the liquid crystal layer and the polarizer, the screen transmittance is about 10%-30%. For an organic light-emitting diode (OLED) screen, the screen transmittance can reach more than 80%; in an embodiment of the present application, the screen transmittance can be stored as a constant in the corresponding hardware device for use in calculating the overall brightness of the screen.

[0061] In summary, in the embodiment of the present application, the screen is divided into multiple partitions, and the target partitions in the partitions are configured with photoelectric sensors; in conjunction with the dimming-off interval and the dimming-on interval of the pulse width modulation that alternately passes through the partitions, the photoelectric sensor can accurately obtain the first brightness and the second brightness of each target partition, and the accurate screen leakage brightness of the target partition can be calculated through the first brightness and the second brightness, and the accurate overall brightness of the entire screen can be further obtained by comprehensively calculating the screen leakage brightness of all target partitions; compared with the related art that only measures the brightness of the opening area behind the screen, the screen partition of the embodiment of the present application, the photoelectric sensor is set in the target partition, and the technical solution of obtaining the overall brightness of the entire screen by combining the measurement results of multiple photoelectric sensors can include all areas of the screen that may have brightness display differences, so that the measurement results can better represent the actual situation of the entire screen, improve the accuracy of screen brightness detection and calculation, and facilitate the subsequent accurate closed-loop adjustment of the screen brightness according to the screen brightness.

[0062] Figure 3 This is an example of a method for obtaining screen brightness provided by this application, refer to Figure 3 , the method may include the following steps:

[0063] Step 301 : acquiring a first brightness detected by the photoelectric sensor when the dimming-off interval passes through the target partition, and a second brightness detected by the photoelectric sensor when the dimming-on interval passes through the target partition.

[0064] Figure 3 The screen brightness acquisition method shown can be applied to a screen having the following characteristics: starting from one end of the screen, a plurality of grid structures are arranged adjacent to each other in sequence along the first direction on the back side of the screen; each of the grid structures has the same size; the grid structure is used to accommodate the photoelectric sensor; the area where each grid structure is projected on the screen is regarded as a partition; all the partitions are the target partitions; the width of the partition is less than or equal to the width of the dimming-off interval, and the width of the partition is less than or equal to the width of the dimming-on interval.

[0065] refer to Figure 4 , Figure 4 yes Figure 3 The corresponding screen partition diagram of the example of the screen brightness acquisition method provided, through the projection of multiple grid structures on the screen, the back of the screen is divided into multiple partitions; the grid structure can be realized by screen foam, middle frame, silicone cover and other components, and the specific grid structure and other effects of the grid structure will be described below. The size of each partition can be determined by factors such as pulse width modulation parameters and the working characteristics of the photoelectric sensor. Figure 4In the screen partition example shown, the width W of each partition is less than or equal to the width of the dimming off interval (70), and at the same time, the width W of each partition is also less than or equal to the width of the dimming on interval (80), so that a single dimming on interval (80) or a single dimming off interval can cover the entire partition; the width W of the partition, the width of the dimming on interval (80), and the width of the dimming off interval (70) respectively refer to their respective dimensions parallel to the first direction X, and the dimension L of the partition perpendicular to the first direction can be set according to the size of the field of view angle of the photoelectric sensor perpendicular to the first direction. The widths of all dimming off intervals (70) are consistent, and the widths of all dimming on intervals (80) are consistent.

[0066] exist Figure 3 In the method example shown, a photoelectric sensor is set in each partition of the screen, so that the brightness of all positions on the screen can be detected, and the brightness of the entire screen can be represented by the detection results of multiple photoelectric sensors and their subsequent calculation results.

[0067] The photoelectric sensor synchronizes the PWM trigger signal, that is, the detection timing of the photoelectric sensor is determined by the positional relationship between the dimming off interval, the dimming on interval and the target partition. By synchronizing the photoelectric sensor with the PWM trigger signal, the photoelectric sensor can be guaranteed to detect at the right time and the accuracy of the detection result can be guaranteed.

[0068] refer to Figure 5 , Figure 5 yes Figure 3 A schematic diagram of an example of a method for obtaining screen brightness is provided. Figure 5 A plurality of consecutive time nodes for executing step 301 are schematically shown.

[0069] like Figure 5 As shown in t0 of step 301, at time t0, the dimming off interval completely covers the target partition D1 where the photoelectric sensor S1 is located. At this time, the photoelectric sensor S1 collects and detects the brightness of the target partition D1 to obtain the first brightness S of the target partition D1. 11 ;

[0070] like Figure 5 As shown in t1 of step 301, at time t1, the dimming off interval is about to leave the target partition D1, at which time the photoelectric sensor S1 stops collecting and detecting, and at the same time, the adjacent dimming on interval completely covers the area D2 where the photoelectric sensor S2 is located. At this time, the photoelectric sensor S2 collects and detects the brightness of the target partition D2, and obtains the second brightness S of the target partition D2. 22 ;

[0071] like Figure 5As shown in t2, at the moment t2 of step 301, the next dimming off interval is about to enter the target partition D2, and the photoelectric sensor S2 stops collecting and detecting the brightness of the target partition;

[0072] like Figure 5 As shown in t3 of FIG. 3 , at the moment t3 of step 301, the dimming start interval completely covers the target partition D1. At this time, the photoelectric sensor S1 starts to collect and detect the brightness of the target partition D1, and obtains the second brightness S of the target partition D1. 12 ;

[0073] like Figure 5 As shown in t4 of step 301, at time t4, the next dimming off interval completely covers the target partition D2. At this time, the photoelectric sensor S1 stops collecting and detecting the brightness of the target partition, and the photoelectric sensor S2 starts collecting and detecting the brightness of the target partition D2, and obtains the second brightness S of the target partition D2. 21

[0074] It can be understood that the first brightness S 11 Characterizes the ambient light brightness of the target partition D1, the second brightness S 12 It represents the superposition value of the ambient light brightness of the target partition and the screen leakage brightness. The same can be applied to the target partition D2 and other target partitions.

[0075] Step 302: Taking the difference between the first brightness and the second brightness as the screen light leakage brightness of the target partition.

[0076] exist Figure 3 In the method example shown, in order to obtain the screen leakage brightness of the target partition, the first brightness and the second brightness of the target partition can be subtracted, and the subtraction result is used as the screen leakage brightness of the target partition. Figure 5 , the screen leakage brightness of the target partition D1 is S 12 -S 11 , the screen leakage brightness of the target partition D2 is S 12 -S 11 , and so on, the screen leakage brightness of each target partition can be obtained.

[0077] Step 303: Obtain the average screen light leakage brightness of the target partitions according to the screen light leakage brightness of each target partition and the number of the target partitions; and use the average screen light leakage brightness of the target partitions as the overall light leakage brightness of the screen.

[0078] After obtaining the screen light leakage brightness of all target partitions, the overall light leakage brightness of the entire screen can be obtained by adding and averaging. For example, the screen light leakage brightness of the target partitions obtained are A1, A2, A3...A n, the number of target partitions is n, then the overall light leakage brightness of the entire screen is S ALL =(A1+A2+A3......A n )÷n.

[0079] Step 304: The product of the overall light leakage brightness of the screen and the screen transmittance is taken as the overall brightness of the entire screen.

[0080] Finally, by substituting the screen transmittance, the overall brightness of the entire screen is obtained. For example, the overall screen leakage brightness obtained in step 303 is S ALL , the screen transmittance is k, then the overall brightness of the entire screen is k×S ALL .

[0081] In summary, Figure 3 In the example shown, the layout design is carried out through the working characteristics of the photoelectric sensor and the screen, which can accurately measure the leakage brightness of the screen and the ambient light brightness, and then obtain the accurate overall brightness of the entire screen, thereby improving the accuracy of screen brightness control.

[0082] Figure 6 This is another example of a method for obtaining screen brightness provided by this application. Figure 6 , the method may include the following steps:

[0083] Step 601, at the beginning of the first time period, modulate the photoelectric sensor to the first field of view angle to obtain the first brightness; at the end of the first time period, modulate the photoelectric sensor to the second field of view angle to obtain the second brightness; the length of the first time period is equal to the length of a single pulse cycle of the pulse width modulation.

[0084] Figure 6 The screen brightness acquisition method shown can be applied to a screen having the following characteristics: starting from one end of the screen, a plurality of grid structures are sequentially arranged adjacent to each other along the first direction on the back side of the screen; each of the grid structures has the same size; the grid structures are used to accommodate the photoelectric sensors; the area where each of the grid structures is projected on the screen is regarded as a partition; all the partitions are the target partitions; the width of the partition is equal to the sum of the widths of the two dimming-on intervals and the width of one dimming-off interval;

[0085] at the same time, Figure 6In the method shown, the photoelectric sensor can obtain the brightness of the area corresponding to the first field of view angle and the second field of view angle along the first direction (that is, the first field of view angle and the second field of view angle are located in the plane determined by the first direction and the photoelectric sensor); the width of the area corresponding to the first field of view angle is equal to the width of one dimming off interval, and the width of the area corresponding to the second field of view angle is equal to the width of the partition. The photoelectric sensor can obtain the brightness of the areas corresponding to the two different field of view angles by means of electronic control modulation.

[0086] refer to Figure 7 , Figure 7 yes Figure 6 The screen partition diagram corresponding to the example of the screen brightness acquisition method provided, through the projection of multiple grid structures on the screen, the back of the screen is divided into multiple partitions; the grid structure can be realized by screen foam, middle frame, silicone cover and other components. Similarly, the size of each partition can be determined by factors such as pulse width modulation parameters and the working characteristics of the photoelectric sensor, but it is different from Figure 4 The screen partition examples shown are different. Figure 7 In the screen partition example shown, the width of the dimming off interval (70) is equal to the width of the dimming on interval (80), and the width W2 of the partition is greater than or equal to the sum of the widths of the two dimming on intervals (80) and the width of one dimming off interval (70), so that one partition requires multiple alternating dimming off intervals (70) and dimming on intervals (80) to cover; the width W2 of the partition, the width of the dimming on interval (80), and the width of the dimming off interval (70) refer to their respective dimensions parallel to the first direction X, and the dimension L2 of the partition perpendicular to the first direction can be set according to the size of the field of view angle of the photoelectric sensor perpendicular to the first direction. It should be noted that the above setting of the width W2 of the partition is only Figure 7 An optional setting method in the screen partitioning example provided, the setting of W2 is not limited to the above form.

[0087] exist Figure 6 In the method example shown, a photoelectric sensor is set in each partition of the screen, so that the brightness of all positions of the screen can be detected, and the brightness display capability of the entire screen can be represented by the detection results of multiple photoelectric sensors and their subsequent calculation results. Figure 3 The difference between the examples shown is that Figure 6 In the example shown, the screen partitions have a larger width, and a single photosensor can be electronically modulated to change the range of the field of view angle to detect the brightness of two different field of view angle ranges, where the smaller field of view angle range can correspond to the width of a single dimming-off interval, and the larger field of view angle range can correspond to the total width of a dimming-off interval and two adjacent dimming-on intervals.

[0088] Similarly, the photoelectric sensor synchronizes the PWM trigger signal, that is, the detection timing of the photoelectric sensor is determined by the positional relationship between the dimming off interval, the dimming on interval and the target partition. By synchronizing the photoelectric sensor with the PWM trigger signal, it can be ensured that the photoelectric sensor detects at the appropriate time and the accuracy of the detection result is guaranteed.

[0089] refer to Figure 8 , Figure 8 yes Figure 6 A schematic diagram of an example of a method for obtaining screen brightness is provided. Figure 7 The execution process of step 601 in the first time period T5 and step 602 in the second time period T6 are schematically shown. The time length of the first time period T5 is the length of a single pulse cycle of pulse width modulation; the first time period T5 and the second time period T6 are two time periods separated by an interval and of equal time length, t51 and t52 are the start time and the end time of T5, respectively, and t61 and t62 are the start time and the end time of T6, respectively; the time interval between the first time period T5 and the second time period T6, that is, the time interval from time t52 to time t61, is equal to the time length of the first time period T5; among the two detection ranges of the photoelectric sensor S3, the smaller detection range corresponds to a field of view angle of the photoelectric sensor, and the larger detection range corresponds to a field of view angle of the photoelectric sensor, b.

[0090] It should be noted that pulse width modulation controls the alternating on and off of the backlight source in a certain area of ​​the screen according to the current pulse, thereby controlling the area to alternately change into a dimming on interval and a dimming off interval. Due to the visual persistence effect of the naked eye, the human eye will observe that the dimming on interval or the dimming off interval has moved along the first direction X. In a complete pulse cycle, the dimming on interval and the dimming off interval will alternate once, that is, the human eye will observe that a dimming on interval moves along the X direction to the position of the adjacent dimming off interval. Similarly, the human eye's observation result of a dimming off interval is that the dimming off interval moves along the X direction to the position of the adjacent dimming on interval; based on the above principle, the change of the field of view angle of the photoelectric sensor can be synchronously controlled by the current pulse, so that the photoelectric sensor can capture the brightness of the corresponding areas of different field of view angles at different times, so as to further calculate the average light leakage brightness of the screen.

[0091] like Figure 8 As shown in t51 in FIG. 1 , the field of view of the photoelectric sensor S3 is a, and its corresponding detection range just corresponds to a dimming start interval. The brightness collected and detected by the photoelectric sensor S3 is the first brightness S at the beginning of the first time period. a5 ,like Figure 8As shown in t52 in FIG. 1 , at the end time t52 of the first time period T5, the field of view angle of the photoelectric sensor S3 is modulated to b. The detection range corresponding to the field of view angle b at time t52 corresponds to two dimming on intervals and one dimming off interval. The brightness collected by the photoelectric sensor is the second brightness S at the end time of the first time period. b5 , understandable, S b5 It is the comprehensive brightness of the entire target partition, which is the superposition of the brightness of a single dimming-off interval and the brightness of two dimming-on intervals; the first brightness includes the brightness of the area in the target partition corresponding to the first field of view angle, and the second brightness includes the brightness of the area in the target partition corresponding to the second field of view angle.

[0092] Step 602: at the beginning of the second time period, modulate the photoelectric sensor to the second field of view angle to obtain the second brightness; at the end of the second time period, modulate the photoelectric sensor to the first field of view angle to obtain the first brightness; the first time period and the second time period are two time periods with an interval and equal time length, and the time interval between the end of the first time period and the beginning of the second time period is equal to the time length of the first time period.

[0093] like Figure 8 As shown in t61 in FIG. 1 , the field of view of the photoelectric sensor S3 is b, and its detection range corresponds to two dimming on intervals and one dimming off interval. The brightness collected and detected by the photoelectric sensor S3 is the second brightness S at the beginning of the first time period. b6 ,like Figure 8 As shown in t62 in FIG. 1 , at the end time t62 in the second time period T6, the field angle of the photoelectric sensor S3 is modulated to a, and the detection range of the field angle a at time t62 corresponds to a dimming start interval, and the brightness collected by the photoelectric sensor is the first brightness S of the second time period. a6 Understandable, S b6 It is the comprehensive brightness of the entire target partition, which is the superposition of the brightness of a single dimming-on interval and the brightness of two dimming-off intervals; the first brightness includes the brightness of the area in the target partition corresponding to the first field of view angle, and the second brightness includes the brightness of the area in the target partition corresponding to the second field of view angle.

[0094] Step 603, calculate and obtain the average screen leakage brightness of the target partition based on the first brightness at the beginning of the first time period, the second brightness at the end of the first time period, the second brightness at the beginning of the second time period, and the first brightness at the end of the second time period, and use the average leakage brightness as the screen leakage brightness of the target partition.

[0095] exist Figure 6In the method example shown, in order to obtain the screen leakage brightness of the target partition, the first brightness at the start of the first time period, the second brightness at the end of the first time period, the second brightness at the start of the second time period, and the first brightness at the end of the second time period can be comprehensively calculated. The result of the comprehensive calculation is the average screen leakage brightness of the target partition, and then the average screen leakage brightness of the target partition is used as the screen leakage brightness of the target partition; refer to Figure 8 , the screen light leakage brightness of the area corresponding to the viewing angle a is S a5 -S a6 , the ambient brightness of the entire target partition is S b6 -(S a5 -S a6 ), the average screen leakage brightness of the entire target partition can be obtained by 3(S b5 -S b6 )+2(S a5 -S a6 )=S p Calculate, S p It is the screen light leakage brightness of the target partition.

[0096] It should be noted that since the frequency of pulse width modulation (up to 3840Hz) is much higher than the refresh frequency of the screen (common values ​​are 60, 120, 144, 240Hz, etc.), it can be considered that during the T5 and T6 time periods, although the dimming-off interval and the dimming-on interval have moved, the display content of the screen itself has not changed, that is, the screen leakage brightness is unchanged, and the average screen leakage brightness calculated from this is relatively accurate.

[0097] Step 604: acquiring the average of the screen leakage brightness of the target partitions according to the screen leakage brightness of each target partition and the number of the target partitions; and taking the average of the screen leakage brightness of the target partitions as the overall leakage brightness of the screen.

[0098] After obtaining the screen light leakage brightness of all target partitions, the overall light leakage brightness of the entire screen can be obtained by adding and averaging. For example, the screen light leakage brightness of the target partitions obtained are A1, A2, A3...A n , the number of target partitions is n, then the overall light leakage brightness of the entire screen is S ALL =(A1+A2+A3......A n )÷n.

[0099] Step 605: The product of the overall light leakage brightness of the screen and the screen transmittance is taken as the overall brightness of the screen.

[0100] Finally, by substituting the screen transmittance, the overall brightness of the entire screen is obtained. For example, the overall screen leakage brightness obtained in step 604 is S ALL , the screen transmittance is k, then the overall brightness of the entire screen is k×S ALL .

[0101] In summary, Figure 6 In the example shown, the layout design is carried out according to the working characteristics of the photoelectric sensor and the screen, which can accurately measure the screen's light leakage brightness and ambient light brightness, and then obtain the accurate overall brightness of the entire screen, thereby improving the accuracy of the screen brightness. Figure 3 Compared to the examples shown, Figure 5 The example shown ensures the accuracy of the photoelectric sensor detection results while greatly reducing the number of photoelectric sensors used and reducing the implementation cost of the entire solution by combining a wider screen partition and a photoelectric sensor that can detect two field angles.

[0102] Fig. 9 This is another example of a method for obtaining the brightness of a screen in the present application, referring to Fig. 9 , the method may include the following steps:

[0103] Step 901: For a target partition corresponding to each lighting band, obtain a first brightness and a second brightness detected by a photoelectric sensor in the target partition.

[0104] Fig. 9 The screen brightness acquisition method shown can be applied to a screen having the following characteristics: starting from one end of the screen, a plurality of light-guiding strips with different light-guiding properties are sequentially arranged on the back of the screen along the first direction, and the light-guiding properties of any two adjacent light-guiding strips are different, and the widths of the light-guiding strips with different light-guiding properties are different; each light-guiding strip serves as the partition in the projection area of ​​the screen; one of the partitions corresponding to the light-guiding strips with the same light-guiding properties is taken as the target partition.

[0105] In the screen design stage, you are not limited to using grid structure for partitioning. Fig.10 , Fig.10 yes Fig. 9 The screen partition diagram of the screen brightness acquisition method example provided, through the projection of multiple light strips on the screen, the back of the screen is divided into multiple partitions; light strips with different light-guiding properties can be realized by different types of lossless light-guiding materials. The size of the light strip is determined by the parameter factors of pulse width modulation. Fig.10In the screen partition example shown, different types of lighting bands may be a third lighting band, a second lighting band, and a first lighting band arranged in sequence along the first direction, wherein the width WP1 of the first lighting band is equal to the difference between the width of the dimming off interval (70) and the width of the dimming on interval (80); the sum of the width WP2 of the second lighting band and the width WP1 of the first lighting band is equal to the width of the dimming off interval (70); the width WP3 of the third lighting band is equal to the width of the dimming on interval (80); the width WP3 of the third lighting band, the width WP2 of the second lighting band, the width WP1 of the first lighting band, the width of the dimming on interval (80), and the width of the dimming off interval (70) respectively refer to their respective dimensions parallel to the first direction X, and the dimensions L3 of the third lighting band, the second lighting band, and the first lighting band perpendicular to the first direction are equal to the dimensions of the screen perpendicular to the first direction. It should be noted that the above division of the third light belt, the second light belt, and the first light belt, as well as the setting of the width WP1 of the first light belt, the width WP2 of the second light belt, and the width WP3 of the third light belt are only Fig.10 An optional setting in the screen partition example provided. Fig. 9 The setting of the lighting strip in the provided method example is not limited to the above-mentioned form.

[0106] The light strips are made of lossless light-guiding materials, so that the brightness of the screen partitions corresponding to multiple light strips with the same light-guiding performance can be uniformly collected and obtained by only one photoelectric sensor. Fig.10 In the screen partition example shown, among the partitions corresponding to the light strips with the same light guiding performance, one partition is selected as the target partition, and the corresponding photoelectric sensor is set. For example, for all the first light strips using light guiding material 1 on the entire screen, the partition corresponding to one of the first light strips is selected as the target partition and a photoelectric sensor is set to obtain the brightness of the partitions corresponding to all the first light strips.

[0107] Similarly, the photoelectric sensor synchronizes the PWM trigger signal, that is, the detection timing of the photoelectric sensor is determined by the positional relationship between the dimming off interval, the dimming on interval and the target partition. By synchronizing the photoelectric sensor with the PWM trigger signal, it can be ensured that the photoelectric sensor detects at the appropriate time and the accuracy of the detection result is guaranteed.

[0108] refer to Fig.11 , Fig.11 yes Fig. 9 A schematic diagram of an example of a method for obtaining screen brightness is provided. Fig.11 A plurality of consecutive time nodes for executing step 901 are schematically shown.

[0109] like Fig.11As shown in t7 of step 901, at time t7, the target partition P2 corresponding to the second lighting band is covered by the dimming off interval, and the photoelectric sensor detects and obtains the first brightness S of P2. 27 The photoelectric sensor detects and obtains the second brightness S of the target partition P3 corresponding to the third lighting belt 37 ;

[0110] like Fig.11 As shown in t8 of step 901, at time t8, the target partition P1 corresponding to the first lighting band is covered by the dimming off interval, and the photoelectric sensor detects and obtains the first brightness S of P1. 18 , the photoelectric sensor detects and obtains the second brightness S of P2 28 , the photoelectric sensor detects and obtains the first brightness S of P3 38 ;

[0111] like Fig.11 As shown in t9 of step 901, at time t9, P1 is covered by the dimming start interval, and the photoelectric sensor obtains the second brightness S of P1. 19

[0112] Step 902: For each lighting band, the difference between the first brightness and the second brightness is used as the screen leakage brightness of the target partition.

[0113] It can be understood that in step 902, the first brightness of the target partition is the ambient light brightness of the target partition, and the second brightness of the target partition is the superposition value of the screen leakage brightness of the target partition and the ambient light brightness.

[0114] exist Fig. 9 In the method example shown, in order to obtain the screen leakage brightness of the target partition, the difference between the first brightness and the second brightness of the target partition can be used as the screen leakage brightness of the target partition. Fig.11 , the screen leakage brightness of the target partition P1 is S 19 -S 18 , the screen leakage brightness of the target partition P2 is S 28 -S 27 , the screen leakage brightness of the target partition P3 is S 38 -S 27 .

[0115] Step 903: The sum of the screen light leakage brightness of all the target partitions is taken as the overall light leakage brightness of the entire screen.

[0116] Since the light-collecting belt adopts lossless light-guiding material, the screen light leakage brightness of the target partition is the screen light leakage brightness of the screen partition corresponding to all the light-collecting belts with the same light-guiding performance. The back area of ​​the screen is completely covered by the light-collecting belt. Therefore, the sum of the results obtained in step 902 can be directly used as the light leakage brightness of the entire screen. For example, if the result obtained at the end of step 902 is that the screen light leakage brightness corresponding to the first light-collecting belt is A1, the screen light leakage brightness corresponding to the second light-collecting belt is A2, and the screen light leakage brightness corresponding to the third light-collecting belt is A3, then the light leakage brightness S of the entire screen is ALL =A1+A2+A3.

[0117] Step 904: taking the product of the overall light leakage brightness of the screen and the screen transmittance as the overall brightness of the screen.

[0118] Finally, by substituting the screen transmittance, the overall brightness of the entire screen is obtained. For example, the overall screen leakage brightness obtained in step 903 is S ALL , the screen transmittance is k, then the overall brightness of the entire screen is k×S ALL .

[0119] In summary, Fig. 9 In the example shown, the screen is divided into multiple zones by multiple lighting strips, multiple photoelectric sensors are added accordingly, and the layout design is carried out according to the working characteristics of the photoelectric sensors and the screen working characteristics. The screen's light leakage brightness and ambient light brightness can be accurately measured, and the overall brightness of the entire screen can be accurately obtained, thereby improving the accuracy of screen brightness control. Figure 6 Compared to the examples shown, Fig. 9 The example shown in the paper not only ensures the accuracy of the detection results of the photoelectric sensor, but also further reduces the number of photoelectric sensors by introducing a light guide belt made of lossless light guide material. Fig.11 The example shown can reduce the number of photoelectric sensors used to three, further reducing the implementation cost of the entire solution. At the same time, the light strip requires less space than the grid structure, increasing the expansion space on the back of the screen.

[0120] In an embodiment of the present application, the screen is divided into multiple partitions, and a target partition in the partition is configured with a photoelectric sensor; in conjunction with the dimming-off interval and the dimming-on interval of the pulse width modulation that alternately passes through the partition, the photoelectric sensor can accurately obtain the first brightness and the second brightness of each target partition, and the accurate screen leakage brightness of the target partition can be calculated through the first brightness and the second brightness, and the accurate overall brightness of the entire screen can be further obtained by comprehensively calculating the screen leakage brightness of all target partitions; compared with the related art that only measures the brightness of the opening area behind the screen, the screen partition of the embodiment of the present application, the photoelectric sensor is set in the target partition, and the technical solution of obtaining the overall brightness of the entire screen by combining the measurement results of multiple photoelectric sensors can include all areas of the screen, so that the final result can better represent the actual situation of the entire screen, improve the accuracy of screen brightness detection and acquisition, and facilitate the subsequent accurate closed-loop adjustment of the screen brightness according to the screen brightness.

[0121] refer to Fig.12 , is a schematic diagram of a side cross-sectional structure of a display panel provided in an embodiment of the present application, wherein the display panel provided in an embodiment of the present application applies the above-mentioned method for obtaining the brightness of a screen; the display panel comprises: a screen (10), a circuit board (20) and a photoelectric sensor (30); the screen (10) corresponds to the circuit board (20), the back side of the screen (10) is divided into a plurality of partitions along a first direction, and a photoelectric sensor (30) is arranged in an area where at least part of the target partition is projected onto the circuit board (20); the photoelectric sensor (30) is used to detect a first brightness and a second brightness generated by pulse width modulation in the target partition, and the circuit board comprises a brightness calculation unit (not shown in the figure), and the brightness calculation unit is used to calculate and obtain the overall brightness of the screen (10) according to the first brightness and the second brightness.

[0122] In order to obtain the overall brightness of the screen (10), a photoelectric sensor (30) can be arranged on a circuit board (20) corresponding to the screen (10). In order to eliminate the brightness display difference that may exist in different areas of the screen (10), the screen (10) is partitioned, and the photoelectric sensor (30) is arranged at a position on the circuit board (20) corresponding to the target partition. In the embodiment of the present application, the screen (10) in the display panel is partitioned, and the photoelectric sensor (30) is arranged for the target partition. By partitioning the entire screen (10), the area in the screen (10) where the brightness display difference exists can also be included in the brightness detection and acquisition process, thereby eliminating the brightness display difference that may exist in different areas of the screen (10), making the overall brightness of the entire screen (10) obtained closer to the actual situation and more accurate, thereby improving the accuracy of the final brightness control of the screen (10) according to the overall brightness of the entire screen (10); the brightness calculation unit can be an independent computing hardware deployed on the circuit board (20). In other embodiments not shown, the screen brightness can also be directly calculated by the central processor of the electronic device where the screen (10) is located.

[0123] Furthermore, the partitioning can be performed by using a grid structure (40), and combined with reference Figure 2 and Fig.12 The display panel further comprises a plurality of grid structures (40), the plurality of grid structures (40) being arranged adjacent to each other in sequence on the back side of the screen (10) starting from one end of the screen (10) along a first direction X, the grid structures (40) being used to accommodate the photoelectric sensors (30); and the area projected on the screen (10) by the grid structures (40) is divided into a partition.

[0124] In the present application, one possible implementation of partitioning the screen (10) is to partition the screen (10) using a plurality of grid structures (40). The grid structures (40) are projected onto the screen (10) and serve as the basis for partitioning the screen (10). The plurality of grid structures (40) can cover the entire back of the screen (10), so that the partitions include all areas of the screen (10), including areas where there may be brightness display differences. These areas will be included in the subsequent brightness acquisition process, so that the influence of the brightness display differences of different areas on the overall brightness of the screen (10) is minimized. At the same time, the grid structure (40) also serves to accommodate the photoelectric sensor (30).

[0125] For further reference, Fig.12 The grid structure (40) presents a hollow column structure, one end of the hollow column structure is connected to the back of the screen (10), and a light diffusion film (50) is laminated on the side of the screen (10) connected to the hollow column structure; the other end of the hollow column structure is connected to a circuit board (20) corresponding to the screen (10).

[0126] The grid structure (40) can be set as a hollow column structure, and the two ends of the hollow column structure are respectively connected to the screen (10) and the circuit board (20). The photoelectric sensor (30) is accommodated in the grid structure (40), which can play a role of partitioning and limiting the photoelectric sensor (30). Fig.13 , Fig.13 is a schematic diagram of a light intensity response curve of a photoelectric sensor (30) provided in an embodiment of the present application, Fig.13 The relationship between the light intensity response of the photoelectric sensor (30) in two adjacent partitions and the position of the central axis of the photoelectric sensor (30) in the embodiment of the present application is exemplarily described. Since the acquisition angle of the photoelectric sensor (30) may be large, the detection ranges of adjacent photoelectric sensors (30) overlap, resulting in repeated acquisition and calculation of light intensity. The photoelectric sensor (30) obtains brightness by collecting light intensity, which will affect the accuracy of the brightness acquisition of the screen (10). The grid structure (40) can limit the acquisition angle of the photoelectric sensor (30) to avoid repeated acquisition. At the same time, the light diffusion film (50) is attached to the side of the screen (10) connected to the hollow column structure, so that the photoelectric sensor (30) in the grid structure (40) can keep the brightness response of each pixel point of the screen (10) partition corresponding to the grid structure (40) consistent. Fig.14 , Fig.14 is another schematic diagram of a light intensity response curve of a photoelectric sensor (30) provided in an embodiment of the present application, Fig.14 The invention exemplarily describes the relationship between the brightness response of the photoelectric sensor (30) in a single partition and the position of the central axis of the photoelectric sensor (30) before and after the light diffusion film (50) is set. Since the light propagates in a straight line, the light is reflected and converged in the grid structure (40), resulting in that the closer the position of the central axis of the photoelectric sensor (30) in the partition is, the higher the light intensity is, which affects the acquisition of brightness by the photoelectric sensor (30) and makes the brightness acquired by the photoelectric sensor (30) inaccurate. The light diffusion film (50) is set on the screen (10) to change the reverse direction of the propagation of the light entering the grid structure (40) from the screen (10), reduce the occurrence of reflection and convergence, and improve the accuracy of the brightness acquired by the photoelectric sensor (30).

[0127] A possible implementation of the grid structure (40) is as follows Fig.12 As shown, Fig.12 The structure of the display panel shown is similar to Figure 3 Corresponding to the method example shown, the width of the grid structure (40) is less than or equal to the width of a single dimming on interval (80), and the width W of the grid structure (40) is less than or equal to the width of a single dimming off interval (70); the width W of the grid structure (40) is the length of the side of the grid structure (40) parallel to the first direction.

[0128] Through the pulse width modulation parameters, i.e., the width of the dimming on interval (80) and the width of the dimming off interval (70), in the first direction, the required partition width W can be determined, and the width W of the grid structure (40) to be set can be further obtained through the required partition width W. The partition width W can have different values ​​according to the difference in the screen brightness acquisition method. Fig.12 and Figure 3 In the example shown, the width W of the partition needs to be less than or equal to the width of the dimming off interval (70) of the pulse width modulation. Since the partition is divided by the area where the grid structure (40) is projected on the back of the screen (10), when setting the grid structure (40), the width W of the grid structure (40) is set to be less than or equal to the width of the dimming off interval (70) of the pulse width modulation. The relationship between the width of the grid and the width of the dimming on interval (80) can be set with reference to the above method. By setting the width of the grid to be less than or equal to the width of the dimming off interval (70), the dimming off interval (70) can completely cover the partition, ensuring that the brightness obtained by the photoelectric sensor (30) at this time is not interfered by the light emitted by the screen (10), thereby improving the accuracy of brightness acquisition.

[0129] The width of the dimming light-off interval is related to the frequency of the pulse width modulation. The higher the frequency of the pulse width modulation, the smaller the width of the dimming light-off interval.

[0130] Another possible implementation of the grid structure (40) is as follows Fig.15 As shown, Fig.15 The structure of the display panel shown is similar to Figure 6 The method examples shown correspond to Fig.15 It is a schematic diagram of a side cross-sectional structure of another display panel provided in an embodiment of the present application, wherein a width W2 of the grid structure (40) is greater than or equal to the sum of the widths of two dimming on intervals (80) and the width of one dimming off interval (70); the photoelectric sensor (30) respectively obtains the brightness of the areas corresponding to the first field of view angle (a) and the second field of view angle (b), wherein the width of the area corresponding to the first field of view angle (a) is equal to the width of one dimming off interval (70); the width of the area corresponding to the first field of view angle (b) is equal to the width of the grid structure (40); and the width W of the grid structure (40) is the length of the side of the grid structure (40) parallel to the first direction.

[0131] like Fig.15As shown, the photoelectric sensor (30) can be configured to obtain the brightness of the area corresponding to the first field of view angle a and the second field of view angle b respectively through electrical control modulation; the width of the area corresponding to the first field of view angle a is equal to the width of one of the dimming off intervals (70), and the width of the area corresponding to the second field of view angle b is equal to the width W2 of the grid structure (40); at the same time, according to the working characteristics of the photoelectric sensor (30) that can detect through two field of view angles, the grid structure (40) is widened. Through the above settings, with Figure 6 The method example shown can also accurately obtain the overall brightness of the screen (10), which is similar to Fig.12 Compared to the grid structure (40) shown, Fig.15 The grid structure (40) has a larger width (i.e. Figure 7 W2 is greater than Figure 4 W in the figure, therefore, when partitioning the screen (10), fewer grid structures (40) can be used to cover the entire back of the screen (10), thereby reducing the density of the grid structures (40). The photoelectric sensors (30) correspond to the grid structures (40), so the number of photoelectric sensors (30) will also be reduced, and the technical solution for obtaining the overall brightness of the screen (10) will cost less.

[0132] In some display panels, a light strip (60) may also be used to partition the screen (10), see Fig.10 , along a first direction, starting from one end of the screen (10), a plurality of light-collecting strips (60) with different light-guiding properties are sequentially arranged adjacent to each other on the back side of the screen (10); the light-collecting strips (60) of any two adjacent light-collecting strips (60) are different in light-guiding properties, and the widths of the light-collecting strips (60) with different light-guiding properties are different; the projection area of ​​each light-collecting strip (60) on the screen (10) is divided into a partition; and a photoelectric sensor (30) is arranged on a target partition in the partition corresponding to the light-collecting strips (60) with the same light-guiding properties.

[0133] Another possible implementation of partitioning the screen (10) in the present application is to partition by multiple lighting strips (60), wherein the length of the lighting strips (60) is consistent with the dimension of the screen (10) perpendicular to the first direction, that is, the lengths of all lighting strips (60) are the same; the projection area of ​​the lighting strips (60) on the screen (10) is divided into partitions, and the lighting strips (60) are laid on the back of the screen (10) so that the partitions include all areas of the screen (10), including areas where there may be differences in brightness display. These areas will be included in the subsequent brightness acquisition process, so that the impact of the differences in brightness display in different areas on the overall brightness of the screen (10) is minimized.

[0134] A possible combination of the lighting strip (60) Fig.10 and Fig.16 As shown, Fig.16 The structure of the display panel shown is similar to Fig. 9 Corresponding to the method example shown, a plurality of light strips (60) with different performances include, in sequence along the first direction: a third light strip (63), a second light strip (62), and a first light strip (61); the width of the first light strip (61) is equal to the difference between the width of the pulse width modulation dimming off interval (70) and the width of the pulse width modulation dimming on interval (80); the sum of the width of the second light strip (62) and the width of the first light strip (61) is equal to the width of the pulse width modulation dimming off interval (70); the width of the third light strip (63) is equal to the width of the pulse width modulation dimming on interval (80).

[0135] Through the parameters of pulse width modulation, i.e., the width of the dimming on interval (80) and the width of the dimming off interval (70), in the first direction, the required partition width can be determined, and the width of the light-collecting belt (60) can be further set according to the required partition width. Different lighting performances can be achieved through different types of lossless light-guiding materials; the lossless light-guiding material can transmit the light entering the light-collecting belt (60) without loss, and change the propagation direction of the light. Therefore, the light passing through the light-collecting belt (60) with the same light-guiding performance can be uniformly collected. By further measuring, the brightness of all partitions corresponding to the light-guiding strip (60) with this light-guiding performance can be obtained; by associating the width of the light-guiding strip (60) with the width of the dimming light-on interval (80) of the pulse width modulation and the width of the dimming light-off interval, the light-guiding strip (60) can be accurately covered by the dimming light-on interval (80) or the dimming light-off interval, so that the light-guiding strip (60) is not interfered with by other light sources, thereby enhancing the accuracy of the detection results collected by the photoelectric sensor (30), and further improving the accuracy of the overall brightness of the entire screen (10).

[0136] In addition, reference Fig.17 , Fig.17 for Fig.16 Another schematic diagram of the layout of the photoelectric sensor (30) is shown in the figure. The setting of the lossless light-guiding material makes the setting position of the photoelectric sensor (30) no longer limited to the back of the screen (10). The photoelectric sensor (30) can be set at other positions of the display panel. The light belt and the photoelectric sensor (30) are connected by a lead wire made of the same material as the light belt. The brightness of each light belt (60) is collected by the photoelectric sensor (30) outside the screen (10), thereby reducing the space requirement on the back of the screen (10). For example, Fig.17The layout of the leads and photoelectric sensors respectively provided for all the first light strips and all the second light strips is drawn as an example. All the first light strips (61) are connected to the first photoelectric sensor (31) outside the screen (10) through the leads of the same light-conducting material as the first light strips, and the brightness of all the first light strips (61) is collected and obtained through the first photoelectric sensor (31); all the second light strips (62) are connected to the second photoelectric sensor (32) outside the screen (10) through the leads of the same light-conducting material as the second light strips, and the brightness of all the second light strips (62) is collected and obtained through the second photoelectric sensor (32); it can be understood that for all the third light strips (63), the photoelectric sensors can also be connected by leads to collect and obtain the brightness of all the third light strips (63).

[0137] The structural design of the light strip (60) is matched with Fig. 9 The method example shown can accurately obtain the overall brightness of the screen (10). Compared with the grid structure (40) mentioned above, the design of the light strip (60) requires less space on the back of the screen (10), and the number of required photoelectric sensors (30) is further reduced, thereby reducing the implementation cost of the entire solution and increasing the expansion space on the back of the screen (10).

[0138] Fig.18 1 is a structural block diagram of an electronic device provided in an embodiment of the present application. The electronic device 180 may include the display panel 181 mentioned above:

[0139] For example, the electronic device may include a computer, a television, a mobile phone, a camera, an instrument, a wearable device, a virtual reality device, or any other electronic device having a display function.

[0140] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0141] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for obtaining screen brightness, characterized in that: The screen is divided into a plurality of partitions, and the partitions include a target partition provided with a photoelectric sensor; and the method includes: When the dimming-off interval and the dimming-on interval of the pulse width modulation alternately pass through the partition along the first direction, respectively acquiring a first brightness detected by the photoelectric sensor when the dimming-off interval passes through the target partition, and a second brightness detected by the photoelectric sensor when the dimming-on interval passes through the target partition; Calculate and obtain the screen light leakage brightness of each target partition according to the first brightness and the second brightness; The overall brightness of the entire screen is calculated and obtained through the screen light leakage brightness of each target partition.

2. The method according to claim 1, characterized in that A plurality of grid structures are arranged adjacent to each other in sequence along the first direction on the back side of the screen; each of the grid structures has the same size; the grid structures are used to accommodate the photoelectric sensors; the area where each of the grid structures is projected onto the screen is regarded as a partition; and all the partitions are the target partitions.

3. The method according to claim 2, characterized in that The width of the partition is less than or equal to the width of the dimming off interval, and the width of the partition is less than or equal to the width of the dimming on interval; The calculating and obtaining the screen light leakage brightness of each target partition according to the first brightness and the second brightness includes: The difference between the first brightness and the second brightness is used as the screen light leakage brightness of the target partition.

4. The method according to claim 2, characterized in that: The width of the partition is greater than or equal to the sum of the widths of the two dimming-on intervals and the width of one dimming-off interval; the photoelectric sensor obtains the brightness of the area corresponding to the first field of view angle and the second field of view angle; the width of the area corresponding to the first field of view angle is equal to the width of one dimming-off interval, and the width of the area corresponding to the second field of view angle is equal to the width of the partition; the obtaining of the first brightness detected by the photoelectric sensor when the dimming-off interval passes through the target partition, and the second brightness detected by the photoelectric sensor when the dimming-on interval passes through the target partition, includes: At the beginning of a first time period, the photoelectric sensor is modulated to the first viewing angle to obtain the first brightness; at the end of the first time period, the photoelectric sensor is modulated to the second viewing angle to obtain the second brightness; the length of the first time period is equal to the length of a single pulse cycle of the pulse width modulation; At the beginning of the second time period, the photoelectric sensor is modulated to the second field of view angle to obtain the second brightness; at the end of the second time period, the photoelectric sensor is modulated to the first field of view angle to obtain the first brightness; the first time period and the second time period are two time periods with an interval and equal time length, and the time interval between the end of the first time period and the beginning of the second time period is equal to the time length of the first time period; The calculating and obtaining the screen light leakage brightness of each target partition according to the first brightness and the second brightness includes: According to the first brightness at the start of the first time period, the second brightness at the end of the first time period, the second brightness at the start of the second time period, and the first brightness at the end of the second time period, the average screen leakage brightness of the target partition is calculated and the average leakage brightness is used as the screen leakage brightness of the target partition.

5. The method according to claim 3 or claim 4, characterized in that: The calculating and obtaining the overall brightness of the entire screen through the screen light leakage brightness of each target partition includes: According to the screen light leakage brightness of each target partition and the number of the target partitions, obtaining the average value of the screen light leakage brightness of the target partition; Taking the average of the screen light leakage brightness of the target partition as the overall light leakage brightness of the screen; The product of the overall light leakage brightness of the screen and the screen transmittance is taken as the overall brightness of the entire screen.

6. The method according to claim 1, characterized in that A plurality of light-guiding strips with different light-guiding properties are arranged in sequence on the back of the screen along the first direction, and the light-guiding properties of any two adjacent light-guiding strips are different, and the widths of the light-guiding strips with different light-guiding properties are different; each light-guiding strip serves as the partition in the projection area of ​​the screen; one of the partitions corresponding to the light-guiding strips with the same light-guiding property is taken as the target partition.

7. The method according to claim 6, characterized in that The acquiring of the first brightness detected by the photoelectric sensor when the dimming-off interval passes through the target partition, and the second brightness detected by the photoelectric sensor when the dimming-on interval passes through the target partition, comprises: For each target partition corresponding to each lighting belt, obtaining a first brightness and a second brightness detected by a photoelectric sensor in the target partition; The calculating and obtaining the screen light leakage brightness of each target partition according to the first brightness and the second brightness includes: For each lighting band, the difference between the first brightness and the second brightness is used as the screen light leakage brightness of the target partition.

8. The method according to claim 6, characterized in that The calculating and obtaining the overall brightness of the entire screen through the screen light leakage brightness of each target partition includes: The sum of the screen light leakage brightness of all the target partitions is used as the overall light leakage brightness of the screen; The product of the overall light leakage brightness of the screen and the screen transmittance is taken as the overall brightness of the screen.

9. A display panel, used to implement the method according to any one of claims 1 to 8, characterized in that: The display panel includes: a screen, a circuit board and a photoelectric sensor; The screen corresponds to the circuit board, the back side of the screen is divided into a plurality of partitions along a first direction, and the photoelectric sensor is arranged in an area where at least part of the target partition is projected onto the circuit board; the photoelectric sensor is used to detect the first brightness and the second brightness generated by pulse width modulation in the target partition; the circuit board includes a brightness calculation unit, and the brightness calculation unit is used to calculate and obtain the overall brightness of the screen based on the first brightness and the second brightness.

10. The display panel according to claim 9, characterized in that: The display panel also includes a plurality of grid structures, which are arranged adjacent to each other in sequence on the back side of the screen along the first direction starting from one end of the screen, and are used to accommodate the photoelectric sensors; the area projected by the grid structures on the screen is divided into one of the partitions.

11. The display panel according to claim 10, characterized in that: The grid structure is a hollow column structure, one end of which is connected to the back of the screen, and a light diffusion film is provided on the side of the screen connected to the hollow column structure; the other end of the hollow column structure is connected to the circuit board corresponding to the screen.

12. The display panel according to claim 11, characterized in that: The width of the grid structure is less than or equal to the width of a single dimming-on interval, and the width of the grid structure is less than or equal to the width of a single dimming-off interval; the width of the grid structure is the length of a side of the grid structure parallel to the first direction.

13. The display panel according to claim 11, characterized in that: The width of the grid structure is greater than or equal to the sum of the width of the two dimming-on intervals and the width of one dimming-off interval; the photoelectric sensor obtains the brightness of the areas corresponding to the first field of view angle and the second field of view angle respectively; the width of the area corresponding to the first field of view angle is equal to the width of one dimming-off interval, and the width of the area corresponding to the second field of view angle is equal to the width of the grid structure; the width of the grid structure is the length of the side of the grid structure parallel to the first direction.

14. The display panel according to claim 9, characterized in that: Along the first direction, starting from one end of the screen, a plurality of light-guiding strips with different light-guiding properties are arranged adjacent to each other on the back of the screen in sequence; the light-guiding properties of any two adjacent light-guiding strips are different, and the widths of the light-guiding strips with different light-guiding properties are different; each of the light-guiding strips is divided into one of the partitions in the projection area of ​​the screen; The target partition in the partition corresponding to the lighting belt with the same light guiding performance is provided with the photoelectric sensor.

15. The display panel according to claim 9, characterized in that: The plurality of light strips with different performances include, in sequence along the first direction: a third light strip, a second light strip, and a first light strip, the width of the first light strip being equal to the difference between the width of the dimming-off interval of the pulse width modulation and the width of the dimming-on interval of the pulse width modulation; the sum of the width of the second light strip and the width of the first light strip being equal to the width of the dimming-off interval of the pulse width modulation; the width of the third light strip being equal to the width of the dimming-on interval of the pulse width modulation.

16. An electronic device, characterized in that: The electronic device comprises the display panel as described in any one of claims 9 to 15.

Images