Display panel, sampling method thereof and display driving chip

Abstract

The application provides a display panel, a sampling method thereof and a display driving chip, and solves the problems of low sampling accuracy, high power consumption and large SRAM source occupation in the prior art. The display panel comprises a first display area and a second display area; the sampling method comprises: judging whether the first display area and the second display area exist display pictures; when the first display area exists a display picture and the second display area does not exist a display picture, collecting the aging value of the first display area by using a first sampling mode; when the second display area exists a display picture and the first display area does not exist a display picture, collecting the aging value of the second display area by using a second sampling mode, or when the first display area and the second display area both exist display pictures, collecting the aging values of the first display area and the second display area by using the second sampling mode; the first sampling mode and the second sampling mode are different.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel, a sampling method thereof and a display driving chip. BACKGROUND

[0002] A display panel supporting off-screen display is prone to aging, and the aging area needs to be compensated. The current compensation method for the display panel generally samples the aging value of the entire display area of the display panel. This sampling method has the problems of low sampling accuracy, high power consumption and excessive occupation of SRAM resources. SUMMARY

[0003] Therefore, the embodiments of the present application provide a sampling method of a display panel, which solves the problems of low sampling accuracy, high power consumption and excessive occupation of SRAM resources in the prior art.

[0004] The first aspect of the present application provides a sampling method of a display panel, the display panel comprising a first display area and a second display area; the sampling method comprising:

[0005] determining whether the first display area and the second display area exist display pictures;

[0006] when the first display area exists a display picture and the second display area does not exist a display picture, collecting the aging value of the first display area by using a first sampling method;

[0007] when the second display area exists a display picture and the first display area does not exist a display picture, collecting the aging value of the second display area by using a second sampling method, or

[0008] when the first display area and the second display area both exist display pictures, collecting the aging value of the first display area and the second display area by using the second sampling method;

[0009] The first sampling method and the second sampling method are different.

[0010] In one embodiment, when the first display area exists a display picture and the second display area does not exist a display picture, collecting the aging value of the first display area by using the first sampling method comprises:

[0011] when the first display area exists a display picture and the second display area does not exist a display picture, determining whether the display picture changes within a time interval of adjacent sampling moments;

[0012] When no change occurs, the statistics show the number of samples contained in the display duration of the display screen without change, and the aging value of the display screen at the first display frame corresponding sampling time in the display duration is collected, and the first aging value is determined based on the number of samples and the aging value at the first display frame corresponding sampling time;

[0013] When a change occurs, the aging value of the display screen after the change at the first display frame corresponding sampling time is collected, and the second aging value is determined based on the aging value at the first display frame corresponding sampling time;

[0014] Preferably, the statistics of the number of samples contained in the display duration of the display screen without change includes: using a fixed sampling interval time, the number of sampling interval times contained in the display duration of the display screen without change is counted;

[0015] Preferably, the first aging value is determined based on the number of samples and the aging value at the first display frame corresponding sampling time includes: the product of the aging value at the first display frame corresponding sampling time and the number of samples is determined as the first aging value;

[0016] Preferably, the second aging value is determined based on the aging value at the first display frame corresponding sampling time includes: the aging value at the first display frame corresponding sampling time of the display screen after the change is determined as the second aging value.

[0017] In one embodiment, when the first display area exists a display screen and the second display area does not exist a display screen, determining whether the display screen changes within the time interval of adjacent sampling time includes:

[0018] Comparing the brightness difference of the display screen at adjacent sampling time, when the difference is less than a threshold value, it is determined that the display screen does not change; when the brightness difference is greater than the threshold value, it is determined that the display screen changes;

[0019] Preferably, the threshold value is 15-25 gray scale.

[0020] In one embodiment, when the second display area exists a display screen and the first display area does not exist a display screen, the aging value of the second display area is collected by using the second sampling method, which includes:

[0021] Using a fixed sampling interval time to collect aging data of the second display area for multiple times;

[0022] The accumulated value of the aging data collected at multiple sampling times is determined as the aging value of the second display area;

[0023] Preferably, when the first display area and the second display area both exist a display screen, the aging value of the first display area and the second display area is collected by using the second sampling method, which includes:

[0024] The first display area and the second display area are collected for multiple times of aging data with fixed sampling interval time;

[0025] The accumulated value of the aging data collected at multiple sampling moments is determined as the aging value of the first display area and the second display area.

[0026] In one embodiment, the first display area is a screen-off display area.

[0027] In one embodiment, when the first display area has a display picture and the second display area has no display picture, after the aging value of the first display area is collected by the first sampling method, the method further comprises compensating the first display area based on the aging value.

[0028] Preferably, when the second display area has a display picture and the first display area has no display picture, after the aging value of the second display area is collected by the second sampling method, the method further comprises compensating the second display area based on the aging value.

[0029] Preferably, when the first display area and the second display area both have display pictures, after the aging values of the first display area and the second display area are collected by the second sampling method, the method further comprises compensating the first display area and the second display area based on the aging values.

[0030] The second aspect of the present application provides a display driving chip, which uses the above-mentioned sampling method to sample a display panel, the display panel comprising a first display area and a second display area; the display driving chip comprising:

[0031] a display area judging module, configured to judge whether the first display area and the second display area have display pictures;

[0032] a first sampling module, connected to the display area judging module, configured to collect the aging value of the first display area by the first sampling method;

[0033] a second sampling module, connected to the display area judging module, configured to collect the aging value of the second display area or the first display area and the second display area by the second sampling method.

[0034] In one embodiment, the display driving chip further comprises:

[0035] a display content comparing module and a difference calculating module, the display content comparing module being connected to the display area judging module, the difference calculating module being located between the display content comparing module and the first sampling module, the display content comparing module being configured to compare the brightness of the display picture of the first display area at adjacent sampling moments, and the difference calculating module being configured to calculate the brightness difference of the display picture of the first display area at adjacent sampling moments.

[0036] Preferably, the display driving chip further comprises a threshold judging module between the difference calculating module and the first sampling module, the threshold judging module being configured to judge the size of the luminance difference value of the display picture of the first display area at the adjacent sampling time and the threshold value;

[0037] Preferably, the display driving chip further comprises a counting module and a multiplier module, the counting module being connected with the first sampling module, and the multiplier module being connected with the counting module, the counting module being configured to count the sampling times of the first display area, and the multiplier module being configured to calculate the product of the aging value at the first sampling time and the sampling times;

[0038] Preferably, the display driving chip further comprises an accumulation module connected with the second sampling module, the accumulation module being configured to accumulate the aging data collected by the second sampling module;

[0039] Preferably, the display driving chip further comprises an accumulated value integrating module connected with the multiplier module and the accumulation module respectively, the accumulated value integrating module being configured to integrate the aging value in the multiplier module and / or the accumulation module.

[0040] In an embodiment, the display driving chip further comprises an aging compensation module connected with the first sampling module and the second sampling module respectively, the aging compensation module being configured to compensate the first display area based on the aging value obtained by sampling the first display area;

[0041] Alternatively, the aging compensation module is configured to compensate the second display area based on the aging value obtained by sampling the second display area;

[0042] Alternatively, the aging compensation module is configured to compensate the first display area and the second display area based on the aging value obtained by sampling the first display area and the second display area;

[0043] Preferably, the display driving chip further comprises a first memory and / or a second memory, the first memory and the second memory being connected with the aging compensation module respectively,

[0044] The first memory is configured to write and / or read the data in the aging compensation module;

[0045] The second memory is configured to output the compensation data to the display area.

[0046] The third aspect of the present application provides a display panel comprising the display driving chip.

[0047] In the present application, the aging value of the first display area is collected by using the first sampling mode, and the aging value of the second display area or the first display area and the second display area is collected by using the second sampling mode, which is conducive to improving the sampling accuracy, and using the two sampling modes is conducive to reducing the occupied static random access memory resources, reducing power consumption, and effectively prolonging the service life of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 Structure diagram of a display panel in an embodiment of the present application.

[0049] Figure 2 Flowchart of a sampling method of a display panel in an embodiment of the present application.

[0050] Figure 3 Flowchart of a sampling method of a display panel in another embodiment of the present application.

[0051] Figure 4 Flowchart of a sampling method of a display panel in another embodiment of the present application.

[0052] Figure 5 Flowchart of a sampling method of a display panel in another embodiment of the present application.

[0053] Figure 6 Structure diagram of a display driving chip in an embodiment of the present application.

[0054] Figure 7 Structure diagram of a display driving chip in another embodiment of the present application.

[0055] Figure 8 Structure diagram of a display driving chip in another embodiment of the present application.

[0056] Figure 9 Structure diagram of a display driving chip in another embodiment of the present application.

[0057] Figure 10 Structure diagram of a display driving chip in another embodiment of the present application. DETAILED DESCRIPTION

[0058] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work, fall within the scope of the present application.

[0059] In addition, in order to better illustrate the present application, numerous specific details are given in the following detailed description. Those skilled in the art should understand that the present application can be implemented without some specific details. In some examples, methods and means familiar to those skilled in the art are not described in detail, in order to highlight the main idea of the present application.

[0060] It should be noted that like reference numerals and characters refer to like elements throughout the following figures and the text, such that when a figure is cited in this disclosure, further definitions and explanations of the cited element should not be necessary in subsequent figures.

[0061] In addition, if the terms "first", "second" and the like are used herein, they are used only for distinguishing one item from another, and do not imply or suggest a relative importance.

[0062] Active-matrix organic light-emitting diode (AMOLED) display technology has the advantages of high color gamut range, high contrast, wide viewing angle and fast response. AMOLED display technology has been widely applied to mobile phones, wearables, vehicle displays and other products.

[0063] Each pixel of the AMOLED display panel emits light autonomously under current driving, and does not require a backlight panel, so the AMOLED is excellent in contrast and color performance. The organic light-emitting material is used as a red (R), green (G), and blue (B) sub-pixel. Even if the driving voltage remains unchanged, the sub-pixel brightness will decay after a long period of use. This phenomenon is aging. Current display panels mostly support AOD display or all-weather display mode, which is prone to aging. In order to eliminate or weaken aging, compensation needs to be performed on the display panel. Currently, the same sampling method is generally used to sample the entire display area, which has the problems of inaccurate sampling, excessive SRAM resource occupation, and high power consumption.

[0064] Therefore, the first aspect of the present application provides a sampling method for a display panel, referring to Figure 1 the structural schematic diagram of the display panel, the display panel 100 includes a first display area 110 and a second display area 120; referring to Figure 2 and Figure 3 the flowchart of the sampling method, the sampling method includes the following steps.

[0065] S100: Determine whether the first display area and the second display area have display pictures.

[0066] It can be understood that the method for determining whether the first display area and the second display area have display pictures is a conventional method, and is not improved in the present application, and will not be described in detail here. Illustratively, AOD display can be performed in the first display area, or AOD display can be performed in the second display area.

[0067] S200: When the first display area has a display picture and the second display area does not have a display picture, a first sampling method is used to collect the aging value of the first display area.

[0068] In the present application, the display panel includes a screen-off display mode and a non-screen-off display mode, the first display area is used to execute the screen-off display mode, and the second display area or the first display area and the second display area are used to execute the non-screen-off display mode. In one embodiment, the first display area is a screen-off display area, and the screen-off display mode is executed in the first display area.

[0069] It should be noted that the screen-off display refers to controlling a local display area of a screen to display some important information, such as time, weather, and the like, without lighting the entire display panel screen. In one embodiment, when the first display area has a display picture and the second display area does not have a display picture, the first sampling mode is used to collect the aging value of the first display area, including: when the first display area has a display picture and the second display area does not have a display picture, it is determined whether the display picture changes within a time interval of adjacent sampling moments; when no change occurs, the number of samples contained in the display time length during which the display picture does not change is counted, and the aging value of the display picture at the sampling moment corresponding to the first display frame within the display time length is collected, and the first aging value is determined based on the number of samples and the aging value at the sampling moment corresponding to the first display frame; when a change occurs, the aging value of the changed display picture at the sampling moment corresponding to the first display frame is collected, and the second aging value is determined based on the aging value at the sampling moment corresponding to the first display frame.

[0070] Exemplarily, the picture displayed by the first display area lasts for 2h, the picture displayed in the first hour is a first picture, the picture displayed in the second hour is a second picture, and the second picture is different from the first picture; the aging value of the first picture at the sampling moment corresponding to the first display frame is collected, the number of samples within 1h of the first picture is counted, and the first aging value within the first hour is determined based on the number of samples and the aging value at the sampling moment corresponding to the first display frame; the aging value of the second picture at the sampling moment corresponding to the first display frame is collected, the number of samples within 1h of the second picture is counted, and the first aging value within the second hour is determined based on the number of samples and the aging value at the sampling moment corresponding to the first display frame.

[0071] Exemplarily, the picture displayed by the first display area lasts for 2h, the picture displayed in the first hour is a first picture, and the picture displayed in the second hour changes frame by frame; the aging value of the first picture at the sampling moment corresponding to the first display frame is collected, the number of samples within 1h of the first picture is counted, and the first aging value is determined based on the number of samples and the aging value at the sampling moment corresponding to the first display frame; within the second hour, the aging value at the sampling moment corresponding to each display frame is collected, and the aging value corresponding to each display frame is a second aging value.

[0072] In one embodiment, the number of samples contained in the display duration during which the display picture does not change is determined by using a fixed sampling interval time to count the number of sampling interval times contained in the display duration during which the display picture does not change. Thus, the number of sampling interval times is the number of samples, and the sampling method is simple, convenient, easy to implement, high in sampling accuracy, and low in SRAM resource occupation.

[0073] In one preferred embodiment, determining the first aging value based on the number of samples and the aging value at the sampling time corresponding to the first display frame includes multiplying the aging value at the sampling time corresponding to the first display frame by the number of samples to determine the first aging value. Preferably, determining the second aging value based on the aging value at the sampling time corresponding to the first display frame includes determining the aging value at the sampling time corresponding to the first display frame of the changed display picture as the second aging value. For example, if the changed display picture continues to change frame by frame, the second aging value is the aging value at the first sampling time multiplied by 1. If the changed display picture remains unchanged for a certain period of time, the aging value of the display panel after the display picture changes is calculated using the calculation method of the first aging value. Thus, the above-mentioned method for determining the first aging value and the second aging value is simple, convenient, and easy to implement, and can accurately determine the first aging value and the second aging value, thereby reducing the power consumption of the timing controller in the display panel.

[0074] In the prior art, the aging value is determined by using a fixed sampling interval time to accumulate the aging value at each sampling time, and the display panel is compensated based on the accumulated aging value. In the present application, whether the display picture in the first display area changes, especially whether the display picture changes when AOD display is performed, is determined by sampling the aging value at the sampling time corresponding to the first display frame, and the first aging value and the second aging value are determined by multiplying the aging value at the sampling time corresponding to the first display frame by the number of samples. Unlike the prior art of accumulating the aging value at each sampling time in real time, the sampling method of the present application can reduce the power consumption of the timing controller in the display panel, effectively prolong the service life of the display panel, and accurately sample the aging value.

[0075] In one embodiment, when the first display area has a display picture and the second display area does not have a display picture, determining whether the display picture changes within the time interval between adjacent sampling times includes comparing the luminance difference of the display picture between adjacent sampling times, determining that the display picture does not change when the difference is less than a threshold value, and determining that the display picture changes when the luminance difference is greater than the threshold value. Thus, the operation is simple, convenient, and easy to implement, and the time interval of the sampling time overlaps with the time interval for determining whether the display picture changes, thereby reducing the power consumption of the timing controller.

[0076] In a preferred embodiment, the threshold value is 15-25 gray scales, for example, can be 15 gray scales, 20 gray scales or 25 gray scales, etc. Thus, it can be more accurate to determine whether the display screen changes.

[0077] It can be understood that when the AOD display is performed in the first display area, the display screen includes time, date, weather and / or camera function identification. For example, the display screen includes time, the displayed time generally does not change within one minute. Within the one minute, the fixed sampling interval time is collected, the aging value of the first display frame corresponding to the sampling time is collected, the number of sampling interval times is counted, and the first aging value is determined. When the time is about to enter the next minute, the display screen changes, the aging value when the display screen changes is collected, the display screen does not change within the next minute, the aging value when the display screen changes is the aging value of the first display frame corresponding to the sampling time, the number of sampling interval times is counted, and the first aging value is determined. Repeat the above process.

[0078] In an embodiment, referring to the sampling method flowchart of the display panel shown in Figure 4 to Figure 5 When the first display area has a display screen and the second display area has no display screen, the first sampling method is used to collect the aging value of the first display area, and the method further includes the following steps.

[0079] S210: Compensate the first display area based on the aging value.

[0080] Compensating the first display area with the aging value is beneficial to prolong the service life of the first display area, and thus the service life of the display panel is longer.

[0081] S300: When the second display area has a display screen and the first display area has no display screen, the second sampling method is used to collect the aging value of the second display area.

[0082] The first sampling method and the second sampling method are different.

[0083] In a specific embodiment, the non-screen-off display mode is executed in the second display area. For example, normal display is performed in the second display area, such as displaying a webpage, a display screen, a video animation, etc.

[0084] In an embodiment, when the second display area has a display screen and the first display area has no display screen, the second sampling method is used to collect the aging value of the second display area, including: using a fixed sampling interval time to collect aging data of the second display area multiple times; and determining the accumulated aging data collected at the multiple sampling times as the aging value of the second display area.

[0085] In an embodiment, referring to the sampling method flowchart of the display panel shown in Figure 4The sampling method flowchart of the display panel shown further comprises the following steps when the second display area exists a display picture and the first display area does not exist a display picture.

[0086] S310: compensating the second display area based on the aging value.

[0087] S400: when the first display area and the second display area both exist a display picture, collecting the aging value of the first display area and the second display area by using the second sampling mode.

[0088] In one embodiment, the non-screen-off display mode is executed in the first display area and the second display area, for example, normal display is performed in the first display area and the second display area, such as displaying a webpage, displaying a picture, displaying a video animation, etc.

[0089] In one embodiment, when the first display area and the second display area both exist a display picture, collecting the aging value of the first display area and the second display area by using the second sampling mode comprises: collecting aging data of the first display area and the second display area for multiple times by using a fixed sampling interval time; and determining the accumulated value of the aging data collected at the multiple sampling moments as the aging value of the first display area and the second display area.

[0090] In one embodiment, referring to Figure 5 The sampling method flowchart of the display panel shown further comprises the following steps when the first display area and the second display area both exist a display picture.

[0091] S410: compensating the first display area and the second display area based on the aging value.

[0092] In one embodiment, the De-burning (DBI) compensation technology is used to compensate the first display area and / or the second display area.

[0093] It should be noted that the first display area and / or the second display area has a corresponding decay rate at different gray scales (brightness) of different display pictures, and the decay rate corresponding to different gray scales is represented by a decay value, and the decay value of the current display picture collected by single sampling is the aging data or the aging value. It can be understood that the compensation of the display panel in the present application can be the compensation of the brightness of the display panel.

[0094] It should be noted that Figure 1 The structural diagram of the display panel shown is only used to explain the present application and cannot be understood as a limitation of the present application. For example, the first display area and the second display area can be located at the same side or opposite sides in the display panel, Figure 1In the present application, only the case that the first display area and the second display area are located at the same side in the display panel is shown.

[0095] In the present application, when the first display area has a display picture and the second display area does not have a display picture, i.e. the first display area performs the screen-off display mode, the first sampling method is used to collect the aging value of the first display area, i.e. the first aging value and the second aging value are determined by multiplying the aging value of the first display frame corresponding to the sampling time by the sampling number; when the second display area or the first display area and the second display area perform the non-screen-off display mode, the second sampling method is used to collect the aging value of the second display area or the first display area and the second display area, which is beneficial to improve the sampling accuracy, and the use of the two sampling methods is beneficial to reduce the occupied static random access memory resources, reduce the power consumption, especially reduce the power consumption of the timing controller in the display panel, and effectively prolong the service life of the display panel.

[0096] Exemplarily, the display panel of the present application is divided into a main display panel and a sub-display panel, the first display area is located in the sub-display panel, and the second display area is located in the main display panel; in the screen-off display mode, only the first display area displays; and in the non-screen-off display mode, the second display area displays or the first display area and the second display area jointly display.

[0097] In one specific embodiment, the display panel includes a main display panel and a sub-display panel, the first display area is located in the sub-display panel, and the second display area is located in the main display panel; in the screen-off display mode, only the first display area displays; and in the non-screen-off display mode, the first display area and the second display area jointly display; and the sampling method of the display panel includes the following process:

[0098] 1. Sampling process:

[0099] (1) Determine whether the main display panel and the sub-display panel have a display picture.

[0100] (2) When the sub-display panel has a display picture and the main display panel does not have a display picture, compare the display pictures, and calculate the brightness difference value of the display pictures at the front and rear sampling times.

[0101] When the brightness difference value of the display pictures at the front and rear sampling times is less than a threshold value (such as a threshold value of 20 gray scales), it is determined that the display picture has not changed; the aging value of the display picture at the sampling time corresponding to the first display frame is collected, for example, the aging value of the first frame of the display picture, the above judgment of whether the brightness of the display picture changes is repeatedly performed at a fixed interval, the sampling interval time, i.e. the sampling number, is counted by the counting module, and the aging value calculation method is: aging value = first frame aging value x sampling number.

[0102] When the brightness difference of the display pictures at the current and previous sampling time is greater than the threshold, it is determined that the display picture changes, the aging value of the first frame of the display picture is collected, the sampling number is 1, and the aging value calculation method is: aging value = aging value of the first frame x 1.

[0103] Generally, it is determined that the display picture of the auxiliary display panel does not change.

[0104] (3) When the display pictures of the main display panel and the auxiliary display panel exist, the main display panel and the auxiliary display panel adopt the same sampling method, and the aging data is collected once at a fixed interval, for example, once every 5 seconds, the collected aging data is accumulated, and the accumulated value is taken as the aging value.

[0105] 2. Compensation process:

[0106] The aging value or accumulated aging value calculated by the sampling process enters the compensation table, the compensation value corresponding to each aging value or accumulated aging value is obtained, and then the compensation value is output, thereby completing the DBI compensation process.

[0107] It should be noted that after the collected aging data is accumulated, the accumulated value needs to be integrated before the compensation process. The accumulated value integration step is a conventional operation, and will not be described in detail here.

[0108] The second aspect of the application provides a display driving chip, which uses the above-mentioned sampling method to sample a display panel, the display panel comprising a first display area and a second display area; referring to Figure 6 the structural schematic diagram of the display driving chip, the display driving chip 200 comprises: a display area judgment module, used for judging whether the first display area and the second display area exist display pictures; a first sampling module, connected with the display area judgment module, used for collecting the aging value of the first display area by using the first sampling method; and a second sampling module, connected with the display area judgment module, used for collecting the aging value of the second display area or the first display area and the second display area by using the second sampling method.

[0109] It should be noted that the above-mentioned description "connected" can be direct connection or indirect connection. For example, the display area judgment module connected with the first sampling module can be indirect connection, and the display area judgment module connected with the second sampling module can be direct connection.

[0110] In one embodiment, referring to Figure 7As shown in the structural schematic diagram of the display driving chip, the display driving chip further comprises a display content comparison module and a difference value calculation module, the display content comparison module is connected with the display area judgment module, the difference value calculation module is located between the display content comparison module and the first sampling module, the display content comparison module is used for comparing the brightness of the display picture of the first display area at adjacent sampling moments, and the difference value calculation module is used for calculating the brightness difference value of the display picture of the first display area at adjacent sampling moments.

[0111] In one embodiment, with reference to Figure 8 As shown in the structural schematic diagram of the display driving chip, the display driving chip further comprises a threshold value judgment module located between the difference value calculation module and the first sampling module, and the threshold value judgment module is used for judging the size of the brightness difference value of the display picture of the first display area at adjacent sampling moments and the threshold value.

[0112] In one embodiment, with reference to Figure 9 As shown in the structural schematic diagram of the display driving chip, the display driving chip further comprises a counting module connected with the first sampling module and a multiplier module connected with the counting module, the counting module is used for counting the sampling times of the first display area, and the multiplier module is used for calculating the product of the aging value at the first sampling moment and the sampling times.

[0113] In one embodiment, with reference to Figure 10 As shown in the structural schematic diagram of the display driving chip, the display driving chip further comprises an accumulation module connected with the second sampling module and used for accumulating the aging data collected by the second sampling module.

[0114] In one embodiment, with reference to Figure 10 As shown in the structural schematic diagram of the display driving chip, the display driving chip further comprises an accumulated value integration module connected with the multiplier module and the accumulation module respectively and used for integrating the aging value in the multiplier module and / or the accumulation module.

[0115] In one embodiment, with reference to Figure 10 As shown in the structural schematic diagram of the display driving chip, the display driving chip further comprises an aging compensation module connected with the first sampling module and the second sampling module respectively, the aging compensation module is used for compensating the first display area based on the aging value obtained by sampling the first display area, or the aging compensation module is used for compensating the second display area based on the aging value obtained by sampling the second display area, or the aging compensation module is used for compensating the first display area and the second display area based on the aging value obtained by sampling the first display area and the second display area.

[0116] It should be noted that the aging compensation module is connected to the first sampling module and the second sampling module indirectly. For example, the aging compensation module is connected to the second sampling module through the accumulation module and the accumulation value integration module.

[0117] In one embodiment, referring to Figure 10 the structural schematic diagram of the display driving chip, the display driving chip further comprises a first memory and / or a second memory, the first memory and the second memory are connected to the aging compensation module respectively, the first memory is used for writing and / or reading data in the aging compensation module; and the second memory is used for outputting compensation data to the display area.

[0118] For example, the first memory is a flash memory (FLASH), and the second memory is an SRAM.

[0119] In one specific embodiment, the display panel comprises a main display panel and a sub-display panel, the first display area is located in the sub-display panel, and the second display area is located in the main display panel. In the screen-off display mode, only the first display area displays, and in the non-screen-off display mode, the first display area and the second display area display together. The display driving chip uses the above-mentioned sampling method to drive the display panel, comprising the following steps:

[0120] 1. Sampling process:

[0121] (1) The display area judgment module judges whether the second display area of the main display panel and the first display area of the sub-display panel exist display pictures.

[0122] (2) When the display area judgment module judges that the display picture exists only in the first display area of the sub-display panel, the display content comparison module compares the display pictures, the difference calculation module calculates the brightness difference of the display pictures at the two sampling moments, and the threshold judgment module is used to judge the size of the brightness difference of the display pictures at the two sampling moments and the threshold value (for example, the threshold value is set to 20 gray scales).

[0123] When the threshold judgment module judges that the brightness difference of the display pictures at the two sampling moments is less than the threshold value, it is determined that the display picture has not changed. The first display frame corresponds to the sampling module to collect the aging value of the display picture at the first sampling moment, which can be the aging value of the first frame of the display picture, for example. The display content comparison module, the difference calculation module and the threshold judgment module are repeatedly used to judge whether the brightness of the display picture exceeds the threshold value at a fixed interval, for example, 5 seconds. The counting module counts the sampling interval time, that is, the sampling number, and the aging value is calculated in the multiplier module. The aging value calculation method is: aging value = first frame aging value x sampling number. The collected aging value is integrated in the accumulation value integration module.

[0124] When the threshold judging module judges that the luminance difference of the display image at the two sampling time points is greater than the threshold value, it is determined that the display image has changed, the second sampling module collects the aging value of the display image at the latter sampling time point as the aging value of the sampling time point corresponding to the first display frame, the counting module counts the sampling number as 1, and the aging value is calculated in the multiplier module. The aging value calculation method is: aging value = aging value of the first frame

[0125] The collected aging value is integrated in the accumulated value integration module.

[0126] In general, it is determined that the display image of the secondary display panel does not change.

[0127] (3) When the display area judging module judges that the second display area in the primary display panel and the first display area in the secondary display panel both exist, the second sampling module uses the same sampling method to sample the primary display panel and the secondary display panel, and aging data is collected once at a fixed interval, for example, once every 5 seconds. The collected aging data is accumulated in the accumulation module, and the accumulated value is used as the aging value. The collected aging value is integrated in the accumulated value integration module.

[0128] 2. Compensation process:

[0129] The aging value or accumulated aging value integrated in the accumulated value integration module enters the compensation process difference compensation table in the aging compensation module, and the compensation value corresponding to each aging value or accumulated aging value is obtained. The compensation value is output through the second memory, and the DBI compensation process is completed. The first memory is used to write and / or read data in the aging compensation module.

[0130] The third aspect of the present application provides a display panel comprising the display driving chip described above.

[0131] It can be understood that the display driving chip has the functions of the above-mentioned sampling function and the functions that a conventional display driving chip should have. Here, it will not be described in more detail.

[0132] In one embodiment, the display panel comprises a primary display panel and a secondary display panel, the secondary display panel is used to execute the screen-off display mode, the primary display panel and the secondary display panel execute the non-screen-off display mode at the same time, the first display area is in the secondary display panel, and the second display area is in the primary display panel. It can be understood that the brightness of the first display area remains basically unchanged when the screen is off.

[0133] Exemplarily, the display panel can be a foldable display panel, the display panel exposed on the outside after folding can be a secondary display panel, and the display panel on the opposite side of the secondary display panel can be a primary display panel. The primary display panel is hidden after folding, and the secondary display panel is used to display time, date, weather, and / or camera function identifier. When the display panel is unfolded, the primary display panel and the secondary display panel display simultaneously.

[0134] Exemplarily, the type of the display panel is not particularly limited, and the display panel can be a mobile phone, a tablet, a smart watch, or the like. The display panel can be an OLED display panel, and can also be an LCD display panel.

[0135] It should be noted that, in addition to the display driving chip, the display panel also includes an array substrate, a pixel layer, a packaging structure, and other structures that a conventional display panel should have. Details are not described herein.

[0136] The basic principles of the application are described above in combination with specific embodiments, but it should be noted that the advantages, advantages, and effects mentioned in the application are only examples and are not limited. These advantages, advantages, and effects cannot be considered as the must-have of each embodiment of the application. In addition, the above-mentioned specific details are only for the purpose of example and understanding, and are not limited to the above-mentioned specific details. The application must be realized by the above-mentioned specific details.

[0137] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the application to the forms disclosed herein. Although the above has discussed a plurality of example aspects and embodiments, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations.

Claims

1. A sampling method of a display panel, characterized in that, The display panel comprises a first display area and a second display area; the sampling method comprises: determining whether the first display area and the second display area have a display picture; when the first display area has the display picture and the second display area does not have the display picture, collecting an aging value of the first display area by using a first sampling mode; when the second display area has the display picture and the first display area does not have the display picture, collecting an aging value of the second display area by using a second sampling mode, or when the first display area and the second display area both have the display picture, collecting aging values of the first display area and the second display area by using the second sampling mode; the first sampling mode and the second sampling mode are different; when the first display area has the display picture and the second display area does not have the display picture, collecting an aging value of the first display area by using a first sampling mode comprises: when the first display area has the display picture and the second display area does not have the display picture, determining whether the display picture changes within a time interval of adjacent sampling moments; when there is no change, counting the number of samplings contained in the display time length during which the display picture does not change, collecting an aging value of the display picture at a first display frame corresponding sampling moment within the display time length, and determining a first aging value based on the number of samplings and the aging value at the first display frame corresponding sampling moment; when there is a change, collecting an aging value of the changed display picture at a first display frame corresponding sampling moment, and determining a second aging value based on the aging value at the first display frame corresponding sampling moment; when the second display area has the display picture and the first display area does not have the display picture, collecting an aging value of the second display area by using a second sampling mode comprises: collecting aging data of the second display area for multiple times by using a fixed sampling interval time; and determining an accumulated value of the aging data collected at multiple sampling moments as the aging value of the second display area; when the first display area and the second display area both have the display picture, collecting aging values of the first display area and the second display area by using the second sampling mode comprises: collecting aging data of the first display area and the second display area for multiple times by using a fixed sampling interval time; and determining an accumulated value of the aging data collected at multiple sampling moments as the aging values of the first display area and the second display area.

2. The sampling method of claim 1, wherein, Counting the number of samplings contained in the display time length during which the display picture does not change comprises: counting the number of sampling interval times contained in the display time length during which the display picture does not change by using a fixed sampling interval time.

3. The sampling method of claim 2, wherein, Determining a first aging value based on the number of samplings and the aging value at the first display frame corresponding sampling moment comprises: determining the product of the aging value at the first display frame corresponding sampling moment and the number of samplings as the first aging value.

4. The sampling method of claim 2, wherein, The determining the second aging value based on the aging value corresponding to the first display frame sampling moment includes: determining the aging value of the first display frame sampling moment of the changed display picture as the second aging value.

5. The sampling method of claim 1, wherein, The judging whether the display picture changes in the time interval of adjacent sampling moments includes: The comparing the luminance difference of the display picture in adjacent sampling moments, and determining that the display picture does not change when the difference is less than a threshold value, and determining that the display picture changes when the luminance difference is greater than the threshold value.

6. The sampling method of claim 5, wherein, The threshold value is 15-25 gray scales.

7. The sampling method of claim 1, wherein, The first display area is a screen-off display area.

8. The sampling method of claim 1, wherein, The adopting the first sampling method to collect the aging value of the first display area when the first display area has the display picture and the second display area does not have the display picture further includes: compensating the first display area based on the aging value.

9. The sampling method of claim 1, wherein, The adopting the second sampling method to collect the aging value of the second display area when the second display area has the display picture and the first display area does not have the display picture further includes: compensating the second display area based on the aging value.

10. The sampling method of claim 1, wherein, The adopting the second sampling method to collect the aging value of the first display area and the second display area when the first display area and the second display area both have the display picture further includes: compensating the first display area and the second display area based on the aging value.

11. A display driving chip, characterized in that, The display panel is sampled by using the sampling method in any one of claims 1-10, and the display panel includes a first display area and a second display area; and the display driving chip includes: a display area judging module, configured to judge whether the first display area and the second display area have a display picture; a first sampling module, connected to the display area judging module, configured to collect the aging value of the first display area by using a first sampling method; a second sampling module, connected to the display area judging module, configured to collect the aging value of the second display area or the first display area and the second display area by using a second sampling method.

12. The display driver chip of claim 11, wherein, Further includes: a display content comparing module and a difference calculating module, the display content comparing module is connected to the display area judging module, the difference calculating module is located between the display content comparing module and the first sampling module, the display content comparing module is configured to compare the luminance of the display picture of the first display area in adjacent sampling moments, and the difference calculating module is configured to calculate the luminance difference of the display picture of the first display area in adjacent sampling moments.

13. The display driver chip of claim 12, wherein, The display driving chip further includes: a threshold value judging module, located between the difference calculating module and the first sampling module, the threshold value judging module is configured to judge the size of the luminance difference of the display picture of the first display area in adjacent sampling moments and a threshold value.

14. The display driver chip of claim 13, wherein, The display driving chip further comprises a counting module and a multiplier module, the counting module is connected with the first sampling module, the multiplier module is connected with the counting module, the counting module is used for counting the sampling times of the first display area, and the multiplier module is used for calculating the product of the aging value at the first sampling time and the sampling times.

15. The display driver chip of claim 14, wherein, The display driving chip further comprises an accumulation module connected with the second sampling module and used for accumulating the aging data collected by the second sampling module.

16. The display driver chip of claim 15, wherein, The display driving chip further comprises an accumulated value integration module connected with the multiplier module and the accumulation module respectively and used for integrating the aging value in the multiplier module and / or the accumulation module.

17. The display driver chip of claim 12, wherein, The display driving chip further comprises an aging compensation module connected with the first sampling module and the second sampling module respectively, the aging compensation module is used for compensating the first display area based on the aging value obtained by sampling the first display area; Or, the aging compensation module is used for compensating the second display area based on the aging value obtained by sampling the second display area; Or, the aging compensation module is used for compensating the first display area and the second display area based on the aging value obtained by sampling the first display area and the second display area.

18. The display driver chip of claim 17, wherein, The display driving chip further comprises a first memory and / or a second memory, the first memory and the second memory are connected with the aging compensation module respectively, The first memory is used for writing and / or reading the data in the aging compensation module; The second memory is used for outputting compensation data to the display area.

19. A display panel, characterized by The display driving chip comprises any one of claims 11-18.

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