Brightness debugging method and device for display panel

Abstract

The invention discloses a brightness debugging method and device for a display panel, and the method comprises the steps: obtaining a plurality of actual display brightness of the display panel in a preset period and the refresh frequency of the display panel, the preset period is greater than or equal to the refresh period of the display panel, and the refresh period comprises at least m holding frames; the holding frame comprises a black frame insertion section and a light emitting section; determining the average brightness of each holding frame in the refresh cycle according to the plurality of actual display brightness and the refresh frequency; the modulation brightness of each holding frame is controlled to be equal, the overall black insertion proportion in a single refresh cycle is kept unchanged, the preset black insertion proportion of each holding frame is determined, the modulation brightness is the ratio of the average brightness to the preset light emitting proportion, and the overall black insertion proportion is the sum of all the black insertion proportions in the refresh cycle. According to the brightness debugging method and device of the display panel, the Gamma debugging effect of the display panel is not affected, and the problem that the display panel is prone to flicker can be solved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and in particular, to a method and device for adjusting the brightness of a display panel. Background Art

[0002] With the development of the active matrix organic light emitting diode (AMOLED) industry and the expansion of application scenarios, variable refresh rate (VRR) technology has been increasingly favored by the market in recent years. However, due to the large electron mobility and hysteresis of low temperature poly-silicon (LTPS), LTPS-TFTs will leak electricity at low refresh frequencies, causing brightness deviation of OLED devices and resulting in screen flicker. Summary of the Invention

[0003] The present invention provides a method and device for adjusting the brightness of a display panel, which neither affect the Gamma adjustment effect of the display panel nor can improve the problem of easy flickering of the display panel.

[0004] According to one aspect of the present invention, there is provided a method for adjusting the brightness of a display panel, the brightness adjustment method comprising:

[0005] Obtaining a plurality of actual display brightnesses of the display panel within a preset period and the refresh rate of the display panel, wherein the preset period is greater than or equal to the refresh period of the display panel, the refresh period includes at least m hold frames, m≥1, and m is an integer; the hold frame includes a black insertion segment and a light emitting segment;

[0006] Determining the average brightness of each of the hold frames within the refresh period according to the plurality of actual display brightnesses and the refresh rate;

[0007] Controlling the modulation brightness of each of the hold frames to be equal and keeping the overall black insertion ratio within a single refresh period unchanged to determine the preset black insertion ratio of each of the hold frames, wherein the modulation brightness is the ratio of the average brightness to a preset light emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

[0008] Optionally, the determining the average brightness of each of the hold frames within the refresh period according to the plurality of actual display brightnesses and the refresh rate specifically includes:

[0009] Determining an actual display brightness curve of the display panel according to the plurality of actual display brightnesses within the preset period;

[0010] Filter the actual display brightness curve to obtain a deformed brightness curve, where the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period;

[0011] Obtain the maximum brightness value and the minimum brightness value in the deformed brightness curve;

[0012] Determine the average brightness of each hold frame within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency.

[0013] Optionally, the determining the average brightness of each hold frame within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency specifically includes:

[0014] Determine the average brightness of the nth hold frame according to the following formula:

[0015]

[0016]

[0017] where, L(t n ) is the average brightness of the nth hold frame, t n is the t moment of the refresh period, L max is the maximum brightness value, L min is the minimum brightness value, k is the refresh frequency, is the brightness change rate, m≥n>0, and n is an integer.

[0018] Optionally, the controlling the modulation brightness of each hold frame to be equal and keeping the overall black insertion ratio within a single refresh period unchanged to determine the preset black insertion ratio of each hold frame specifically includes:

[0019] Control the modulation brightness of each hold frame to be equal, control the preset black insertion ratio of the hold frame at the set time to be the set black insertion ratio, and control the average brightness of the hold frame at the set time to be the set average brightness to determine the preset black insertion ratio of each hold frame.

[0020] Optionally, the controlling the preset black insertion ratio of the hold frame at the set time to be the set black insertion ratio and controlling the average brightness of the hold frame at the set time to be the set average brightness specifically includes:

[0021] When m is an even number, control the preset black insertion ratio of the hold frame at the m / 2th time to be the average black insertion ratio within the refresh period, and control the average brightness of the hold frame at the m / 2th time to be the average value of the maximum brightness value and the minimum brightness value;

[0022] When m is an odd number, control the preset black insertion ratio of the ((m + 1) / 2)-th holding frame to be the average black insertion ratio within the refresh period, and control the average brightness of the ((m + 1) / 2)-th holding frame to be the average value of the maximum brightness value and the minimum brightness value.

[0023] Optionally, the filtering the actual display brightness curve to obtain the deformed brightness curve specifically includes:

[0024] Modulating the actual display brightness curve with the Jeita factor to obtain the deformed brightness curve.

[0025] Optionally, after determining the preset black insertion ratio of each holding frame, further includes:

[0026] Adjusting the black insertion ratio of each holding frame to the corresponding preset black insertion ratio.

[0027] Optionally, the refresh frequency is 60 Hz or less.

[0028] According to another aspect of the present invention, there is provided a brightness debugging device for a display panel, the brightness debugging device includes: an actual brightness acquisition module, an average brightness determination module, and a preset black insertion ratio determination module;

[0029] The actual brightness acquisition module is configured to acquire a plurality of actual display brightnesses of the display panel within a preset period and the refresh frequency of the display panel, wherein the preset period is greater than or equal to the refresh period of the display panel, the refresh period includes at least m holding frames, m ≥ 1, and m is an integer; the holding frame includes a black insertion section and a light emitting section;

[0030] The average brightness determination module is configured to determine the average brightness of each holding frame within the refresh period according to the plurality of actual display brightnesses and the refresh frequency;

[0031] The preset black insertion ratio determination module is configured to control the modulated brightness of each holding frame to be equal and keep the overall black insertion ratio within a single refresh period unchanged, so as to determine the preset black insertion ratio of each holding frame, wherein the modulated brightness is the ratio of the average brightness to the preset light emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

[0032] Optionally, the average brightness determination module includes an actual brightness curve determination unit, a curve processing unit, a brightness acquisition unit, and an average brightness determination unit;

[0033] The actual brightness curve determination unit is configured to determine the actual display brightness curve of the display panel according to the plurality of actual display brightnesses within the preset period;

[0034] The curve processing unit is used to perform filtering processing on the actual display brightness curve to obtain a deformed brightness curve, wherein the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period;

[0035] The brightness acquisition unit is used to acquire the maximum brightness value and the minimum brightness value in the deformed brightness curve;

[0036] The average brightness determination unit is used to determine the average brightness of each holding frame within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency.

[0037] This embodiment provides a brightness debugging method for a display panel. The brightness debugging method includes: first, obtaining the refresh frequency of the display panel and multiple actual display brightnesses within a preset period, where the preset period is greater than or equal to the refresh period of the display panel, so as to obtain the actual display brightness within a complete refresh period. A single refresh period includes at least m holding frames, and each holding frame includes a black insertion segment and a light-emitting segment. Then, determining the average brightness of each holding frame within a single refresh period according to the refresh frequency and multiple actual display brightnesses, and then determining the preset black insertion ratio of each holding frame. When determining the preset black insertion ratio, controlling the modulated brightness of each holding frame and keeping the overall black insertion ratio within a single refresh period unchanged, where the modulated brightness is determined according to the ratio of the average brightness to the preset light-emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period. In this embodiment, controlling the modulated brightness of each holding frame to be equal can make the brightness difference between each holding frame smaller, thereby improving the flicker problem generated by the display panel. Keeping the overall black insertion ratio within a single refresh period unchanged can not affect the Gamma debugging effect of the display panel, and ensure the uniformity of the display panel while suppressing flicker. In summary, the brightness debugging method for the display panel provided in this embodiment neither affects the Gamma debugging effect of the display panel nor can improve the problem that the display panel is prone to flicker.

[0038] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. Brief Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Figure 1It is a schematic flowchart of a method for adjusting the brightness of a display panel according to an embodiment of the present invention;

[0041] Figure 2 It is a schematic diagram of an actual display brightness curve formed by obtaining multiple actual display brightnesses of a display panel within a preset period according to an embodiment of the present invention;

[0042] Figure 3 It is a timing diagram within one refresh period according to an embodiment of the present invention;

[0043] Figure 4 It is a schematic flowchart of another method for adjusting the brightness of a display panel according to an embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of an actual display brightness curve and a deformed brightness curve according to an embodiment of the present invention;

[0045] Figure 6 It is a schematic flowchart of another method for adjusting the brightness of a display panel according to an embodiment of the present invention;

[0046] Figure 7 It is a schematic structural diagram of a device for adjusting the brightness of a display panel according to an embodiment of the present invention. Detailed implementation manners

[0047] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0049] Figure 1It is a schematic flowchart of a method for adjusting the brightness of a display panel according to an embodiment of the present invention. Refer to Figure 1 , the brightness adjustment method provided in this embodiment includes the following steps:

[0050] S110. Obtain multiple actual display brightnesses of the display panel within a preset period and the refresh frequency of the display panel. Here, the preset period is greater than or equal to the refresh period of the display panel. The refresh period includes at least m holding frames, m≥1, and m is an integer; the holding frame includes a blanking segment and a lighting segment.

[0051] Specifically, the refresh frequency of the display panel can be 15Hz, 30Hz, 45Hz, 60Hz, etc. The refresh period is determined according to the refresh frequency. Exemplarily, if the refresh frequency of the display panel is denoted as k, then the refresh period is 1 / k.

[0052] The obtained actual display brightness can be the average display brightness of each light-emitting unit in the entire display area of the display panel, or the average display brightness of the light-emitting units in a partial display area, or the maximum display brightness in the entire display area. Figure 2 It is a schematic diagram of an actual display brightness curve obtained by acquiring multiple actual display brightnesses of the display panel within a preset period according to an embodiment of the present invention. Refer to Figure 2 , Figure 2 The abscissa in represents time, and the ordinate represents the actual display brightness. In this embodiment, setting the preset period to be greater than or equal to the refresh period can obtain an actual display brightness curve within a complete single refresh period.

[0053] Figure 3 It is a timing diagram within a refresh period according to an embodiment of the present invention. Refer to Figure 3 , a single refresh period includes m holding frames, and each holding frame includes a blanking segment and a lighting segment. The light-emitting unit does not emit light during the blanking segment and emits light during the lighting segment. If the blanking segment duration of the first holding frame is denoted as P 11 , and the lighting segment duration is denoted as P 12 , the blanking segment duration of the second holding frame is denoted as P 21 , and the lighting segment duration is denoted as P 22 ... The blanking segment duration of the mth holding frame is denoted as P m1 , and the lighting segment duration is denoted as P m2 , then the blanking ratio of the first holding frame can be denoted as P 11 / (P 11 +P 12 ), and the lighting ratio can be denoted as P 12 / (P 11 +P 12 )... The blanking ratio of the mth holding frame can be denoted as P m1 / (P m1 +Pm2 ) The luminous ratio can be denoted as P m2 / (P m1 +P m2 ).

[0054] S120. Determine the average brightness of each holding frame within the refresh period according to multiple actual display brightnesses and refresh frequencies.

[0055] Specifically, the average brightness of each holding frame can be the actual display brightness at the middle moment of each holding frame, or the brightness obtained by integrating the actual display brightness within each holding frame and dividing by the total duration of the holding frame, or the average brightness of each holding frame obtained by deforming the actual display brightness curve formed by multiple actual display brightnesses and obtaining the deformed brightness curve.

[0056] S130. Control the modulation brightness of each holding frame to be equal and keep the overall black insertion ratio within a single refresh period unchanged to determine the preset black insertion ratio of each holding frame, where the modulation brightness is the ratio of the average brightness to the preset luminous ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

[0057] Specifically, the luminous ratio is the ratio of the luminous segment duration to the total duration of a single holding frame, the black insertion ratio is the ratio of the black insertion segment duration to the total duration of a single holding frame, and the total duration of the holding frame is the sum of the luminous segment duration and the black insertion segment duration. The sum of the luminous ratio and the black insertion ratio within a single holding frame is 1.

[0058] Denote the preset black insertion ratio in the first holding frame as δ1, the preset luminous ratio as 1 - δ1, the preset black insertion ratio in the second holding frame as δ2, the preset luminous ratio as 1 - δ2... the preset black insertion ratio in the mth holding frame as δ m , the preset luminous ratio is denoted as 1 - δ m , and denote the average brightness of the first holding frame as L(t1), the average brightness of the second holding frame as L(t2)... the average brightness of the mth holding frame as L(t m ), then in step S130, it is necessary to control:[[]]

[0059]

[0060] If before step S110, the selected refresh frequency of the display panel is k, a single refresh period includes m holding frames, and the black insertion ratio of each holding frame is δ, then in step S130, it is necessary to keep:[[]]

[0061] δ1 + δ2 + … δ m = mδ

[0062] Obtain δ1, δ2, …, δ of each hold frame according to the above two formulas m , and finally, the black insertion ratio of each hold frame can be controlled to be the preset black insertion ratio, thereby completing the debugging process of the display panel.

[0063] This embodiment provides a method for adjusting the brightness of a display panel. The brightness adjustment method includes: first, obtaining the refresh frequency of the display panel and multiple actual display brightnesses within a preset period, where the preset period is greater than or equal to the refresh period of the display panel, so that the actual display brightness within a complete refresh period can be obtained. A single refresh period includes at least m hold frames, and each hold frame includes a black insertion segment and a light-emitting segment. Then, determine the average brightness of each hold frame within a single refresh period according to the refresh frequency and multiple actual display brightnesses, and then determine the preset black insertion ratio of each hold frame. When determining the preset black insertion ratio, control the modulation brightness of each hold frame and keep the overall black insertion ratio within a single refresh period unchanged, where the modulation brightness is determined according to the ratio of the average brightness to the preset light-emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period. In this embodiment, controlling the modulation brightness of each hold frame to be equal can make the brightness difference between each hold frame smaller, thereby improving the flicker problem generated by the display panel. Keeping the overall black insertion ratio within a single refresh period unchanged does not affect the Gamma debugging effect of the display panel, and ensures the uniformity of the display panel while suppressing flicker. In summary, the brightness adjustment method of the display panel provided in this embodiment of the present invention neither affects the Gamma debugging effect of the display panel nor can improve the problem that the display panel is prone to flicker.

[0064] Optionally, Figure 4 is a schematic flowchart of another method for adjusting the brightness of a display panel according to an embodiment of the present invention. Refer to Figure 4 , the brightness adjustment method provided in this embodiment includes the following steps:

[0065] S210. Obtain multiple actual display brightnesses of the display panel within a preset period and the refresh frequency of the display panel, where the preset period is greater than or equal to the refresh period of the display panel, and the refresh period includes at least m hold frames, m≥1, and m is an integer; the hold frame includes a black insertion segment and a light-emitting segment.

[0066] Specifically, the content of step S210 is the same as the content of step S110. For the description of step S210, please refer to the description of step S110.

[0067] S220. Determine the actual display brightness curve of the display panel according to multiple actual display brightnesses within the preset period.

[0068] Specifically, refer to Figure 2 Figure 2 is the actual display brightness curve determined according to multiple actual display brightnesses.​

[0069] S230. Filter the actual display brightness curve to obtain a deformed brightness curve, where the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period.

[0070] Specifically, the actual display brightness curve includes some clutter. If the average brightness of each hold frame is determined according to the actual display brightness curve, it is easy that the calculated average brightness cannot accurately reflect the brightness of each hold frame. In this embodiment, the actual display brightness curve is filtered to obtain a deformed brightness curve, and the average brightness of each hold frame determined according to the deformed brightness curve can more accurately reflect the brightness of each hold frame. Figure 5 is a schematic diagram of an actual display brightness curve and a deformed brightness curve provided according to an embodiment of the present invention. Refer to Figure 5 , denote the actual display brightness curve as S1 and the deformed brightness curve as S2. The time interval from the adjacent maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period, that is, 1 / k.

[0071] It should be noted that Figure 5 the trend of the deformed brightness curve S2 in

[0072] is only one of the curves after filtering, and is not a limitation on the deformed brightness curve S2 in the present invention. The deformed brightness curve S2 after filtering can still be a linear curve.

[0073] Specifically, the maximum brightness value corresponding to the peak and the minimum brightness value corresponding to the valley can be directly obtained from the deformed brightness curve by using simple bubble sort.

[0074] S250. Determine the average brightness of each hold frame within the refresh period according to the maximum brightness value, the minimum brightness value and the refresh frequency.

[0075] Specifically, first determine the brightness change rate according to the maximum brightness value, the minimum brightness value and the refresh frequency. Denote the maximum brightness value as L max , denote the maximum brightness value as L min , denote the refresh frequency as k. Assume that the brightness corresponding to the deformed brightness curve at time 0 is the maximum brightness value, and the time interval from the peak to the valley of the brightness is Then the brightness change rate is Within one refresh period, the brightness at time t can be expressed as The average brightness of each hold frame can be the brightness at the middle time of each hold frame, or the brightness at a specific time of each hold frame.

[0076] The following takes the brightness when the average brightness of each holding frame is 1 / h of the total duration of each holding frame as an example for explanation. In step S110, m holding frames are selected within a single refresh period of the display panel, and the durations of each holding frame are equal. If the refresh frequency of the display panel is k, the total duration of each holding frame can be The average brightness L(t n ) of the nth holding frame within a refresh period can be represented by the brightness at time t n , where t n can be equal to the sum of the total durations of the previous n - 1 holding frames and 1 / h of the total duration of the nth holding frame, and t n is specifically represented as:

[0077]

[0078] The average brightness L(t n ) of the nth holding frame is represented as:

[0079]

[0080] Among them, h can be 2, that is, the average brightness of the nth holding frame can be the brightness at the middle moment of the nth holding frame, and h can also be 3 or 4, etc.

[0081] S260. Control the modulation brightness of each holding frame to be equal and keep the overall black insertion ratio within a single refresh period unchanged to determine the preset black insertion ratio of each holding frame, where the modulation brightness is the ratio of the average brightness to the preset light emission ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

[0082] Specifically, the content of step S260 is the same as the content of step S130. For the description of step S260, please refer to the description of step S130 for details.

[0083] Optionally, determining the average brightness of each holding frame within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency specifically includes:

[0084] Determine the average brightness of the nth holding frame according to the following formula:

[0085]

[0086]

[0087] Among them, L(t n ) is the average brightness of the nth holding frame, t n is the t moment of the refresh period, L max is the maximum brightness value, L min is the minimum brightness value, and k is the refresh frequency. is the brightness change rate, m≥n>0, and n is an integer.

[0088] Specifically, in this embodiment, the brightness at the middle moment of each holding frame is used as the average brightness of each holding frame.

[0089] Optionally, Figure 6 is a schematic flowchart of another method for adjusting the brightness of a display panel provided according to an embodiment of the present invention. Refer to Figure 6 , the method for adjusting the brightness provided in this embodiment includes the following steps:

[0090] S310. Obtain multiple actual display brightnesses of the display panel within a preset period and the refresh frequency of the display panel. Among them, the preset period is greater than or equal to the refresh period of the display panel, the refresh period includes at least m holding frames, m≥1, and m is an integer; the holding frame includes a black insertion segment and a light-emitting segment.

[0091] Specifically, the content of step S310 is the same as the content of step S110. For the description of step S310, reference can be made to the description of step S110.

[0092] S320. Determine the actual display brightness curve of the display panel according to the multiple actual display brightnesses within the preset period.

[0093] Specifically, the content of step S320 is the same as the content of step S220. For the description of step S320, reference can be made to the description of step S220.

[0094] S330. Perform filtering processing on the actual display brightness curve to obtain a deformed brightness curve. Among them, the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period.

[0095] Specifically, the content of step S330 is the same as the content of step S230. For the description of step S330, reference can be made to the description of step S230.

[0096] S340. Obtain the maximum brightness value and the minimum brightness value in the deformed brightness curve.

[0097] Specifically, the content of step S340 is the same as the content of step S240. For the description of step S340, reference can be made to the description of step S240.

[0098] S350. Determine the average brightness of each holding frame within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency.

[0099] Specifically, the content of step S350 is the same as the content of step S250. For the description of step S350, reference can be made to the description of step S250.

[0100] S360, controlling the modulation brightness of each holding frame to be equal, controlling the preset black insertion ratio of the holding frame of the set time to be the set black insertion ratio, and controlling the average brightness of the holding frame of the set time to be the set average brightness, so as to determine the preset black insertion ratio of each holding frame.

[0101] Specifically, the black insertion ratio and the average brightness can be set by the user. The black insertion ratio can be the average value of the overall black insertion ratio of the display panel, and the average brightness can be the maximum brightness value, the minimum brightness value, or the average value of the maximum brightness value and the minimum brightness value in the deformation brightness curve. The first setting time can be the first time, the m / 2 time, the m / 3 time, or the m time, etc. When the preset black insertion ratio and the average brightness of the holding frame of the first setting time are determined, the preset black insertion ratio and the average brightness of each other holding frame can be quickly determined, so that the display brightness of the display panel can be quickly adjusted according to the determined preset black insertion ratio and the average brightness.

[0102] Optionally, controlling the preset black insertion ratio of the set-th holding frame to be the set black insertion ratio, and controlling the average brightness of the set-th holding frame to be the set average brightness specifically includes:

[0103] When m is an even number, the preset black insertion ratio of the m / 2th holding frame is controlled to be the average black insertion ratio in the refresh cycle, and the average brightness of the m / 2th holding frame is controlled to be the average of the maximum brightness value and the minimum brightness value;

[0104] When m is an odd number, the preset black insertion ratio of the (m+1) / 2th holding frame is controlled to be the average black insertion ratio in the refresh cycle, and the average brightness of the (m+1) / 2th holding frame is controlled to be the average of the maximum brightness value and the minimum brightness value.

[0105] Specifically, taking m as an even number as an example, the modulation brightness of each holding frame is controlled to be equal according to the following formula, the preset black insertion ratio of the holding frame for the m / 2th time is controlled to be the average black insertion ratio in the refresh cycle, and the average brightness of the holding frame for the m / 2th time is controlled to be the average of the maximum brightness value and the minimum brightness value:

[0106]

[0107] Among them, δ is the average black insertion ratio in the refresh cycle;

[0108] Combining the above formulas, the preset black insertion ratio of the nth hold frame can be obtained as:

[0109]

[0110] The average black insertion ratio δ in the refresh cycle can be determined by obtaining the number of frames held by the display panel in a single refresh cycle and the overall black insertion ratio in the single refresh cycle before step S110 .

[0111] In this embodiment, the preset black insertion ratio of the m / 2-th or (m + 1) / 2-th holding frame is set as the average black insertion ratio, and the average brightness of the m / 2-th or (m + 1) / 2-th holding frame is the average value of the maximum brightness value and the minimum brightness value, which can make the change trend of the preset black insertion ratio from the 1st holding frame to the m-th holding frame first gradually decrease and then gradually increase. Thus, the change trend of the average display brightness from the 1st holding frame to the m-th holding frame is first gradually decrease and then gradually increase, further avoiding too large a difference in the display brightness between the 1st holding frame and the m-th holding frame after debugging, and further improving the flicker problem of the display panel.

[0112] Optionally, filtering the actual display brightness curve to obtain a deformed brightness curve specifically includes: modulating the actual display brightness curve with the Jeita factor to obtain a deformed brightness curve. Such a setting can improve the filtering effect and facilitate obtaining the maximum brightness value and the minimum brightness value in subsequent steps.

[0113] Optionally, after determining the preset black insertion ratio of each holding frame, it further includes: adjusting the black insertion ratio of each holding frame to the corresponding preset black insertion ratio.

[0114] Specifically, after adjusting the black insertion ratio of each holding frame to the preset black insertion ratio, the Flicker value of the display panel will become lower. Flicker in the industry is mainly quantified by the Flicker index. The more negative the Flicker value, the lighter the flicker degree. It is found through experiments that before the display panel adopts the brightness debugging method provided in this embodiment, its Flicker value at a brightness of 200 nit is -34.9. After debugging with the brightness debugging method provided in this embodiment, that is, after adjusting the black insertion ratio of each holding frame to the corresponding preset black insertion ratio, the Flicker value of the display panel at a brightness of 200 nit is -52.9. It can be seen that the brightness debugging method provided in this embodiment can significantly improve the problem of easy flicker of the display panel.

[0115] Optionally, the refresh frequency is 60 Hz or less.

[0116] Specifically, the refresh frequency k ≤ 60 Hz. The brightness debugging method of the display panel provided in this embodiment can suppress the flicker phenomenon of the display panel at a low refresh frequency.

[0117] Figure 7 is a schematic structural diagram of a brightness debugging device for a display panel according to an embodiment of the present invention. Refer to Figure 7 , the brightness debugging device provided in this embodiment includes: an actual brightness acquisition module 110, an average brightness determination module 120, and a preset black insertion ratio determination module 130;

[0118] The actual brightness acquisition module 110 is configured to acquire a plurality of actual display brightnesses of the display panel within a preset period and the refresh frequency of the display panel, where the preset period is greater than or equal to the refresh period of the display panel, the refresh period includes at least m hold frames, m≥1, and m is an integer; the hold frame includes a black insertion segment and a light-emitting segment;

[0119] The average brightness determination module 120 is configured to determine the average brightness of each hold frame within the refresh period according to the plurality of actual display brightnesses and the refresh frequency;

[0120] The preset black insertion ratio determination module 130 is configured to control the modulation brightness of each hold frame to be equal and keep the overall black insertion ratio within a single refresh period unchanged, so as to determine the preset black insertion ratio of each hold frame, where the modulation brightness is the ratio of the average brightness to the preset light-emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

[0121] Optionally, the average brightness determination module includes an actual brightness curve determination unit, a curve processing unit, a brightness acquisition unit, and an average brightness determination unit;

[0122] The actual brightness curve determination unit is configured to determine the actual display brightness curve of the display panel according to the plurality of actual display brightnesses within the preset period;

[0123] The curve processing unit is configured to perform filtering processing on the actual display brightness curve to obtain a deformed brightness curve, where the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period;

[0124] The brightness acquisition unit is configured to acquire the maximum brightness value and the minimum brightness value in the deformed brightness curve;

[0125] The average brightness determination unit is configured to determine the average brightness of each hold frame within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency.

[0126] The brightness debugging device of the display panel provided in this embodiment has corresponding beneficial effects with the display panel brightness debugging method provided in any embodiment of the present invention. For the technical details not elaborated in this embodiment, please refer to the display panel brightness debugging method provided in any embodiment of the present invention.

[0127] It should be understood that the various forms of the processes shown above can be used, reordering, adding, or deleting steps. For example, the steps described in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitations are imposed herein.

[0128] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for adjusting the brightness of a display panel, characterized in that, Including: Obtaining a plurality of actual display brightnesses of the display panel within a preset period and the refresh frequency of the display panel, where the preset period is greater than or equal to the refresh period of the display panel, the refresh period includes at least m holding frames, m≥1, and m is an integer; the holding frame includes a black insertion segment and a light-emitting segment; Determining the average brightness of each of the holding frames within the refresh period according to the plurality of actual display brightnesses and the refresh frequency; Controlling the modulation brightness of each of the holding frames to be equal and keeping the overall black insertion ratio within a single refresh period unchanged to determine the preset black insertion ratio of each of the holding frames, where the modulation brightness is the ratio of the average brightness to the preset light-emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

2. The brightness adjustment method according to claim 1, characterized in that, The determining the average brightness of each of the holding frames within the refresh period according to the plurality of actual display brightnesses and the refresh frequency specifically includes: Determining the actual display brightness curve of the display panel according to the plurality of actual display brightnesses within the preset period; Performing a filtering process on the actual display brightness curve to obtain a deformed brightness curve, where the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period; Obtaining the maximum brightness value and the minimum brightness value in the deformed brightness curve; Determining the average brightness of each of the holding frames within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency.

3. The brightness adjustment method according to claim 2, characterized in that, The determining the average brightness of each of the holding frames within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh frequency specifically includes: Determining the average brightness of the nth holding frame according to the following formula: Among them, L(t n ) is the average luminance of the nth said holding frame, t n is the t moment of the said refresh period, L max is the said maximum luminance value, L min is the said minimum luminance value, k is the said refresh frequency, is the luminance change rate, m≥n>0, and n is an integer.

4. The brightness adjustment method according to claim 2, characterized in that, The controlling the modulation brightness of each of the holding frames to be equal and keeping the overall black insertion ratio within a single refresh period unchanged to determine the preset black insertion ratio of each of the holding frames specifically includes: Controlling the modulation brightness of each of the holding frames to be equal, controlling the preset black insertion ratio of the set-th holding frame to be the set black insertion ratio, and controlling the average brightness of the set-th holding frame to be the set average brightness to determine the preset black insertion ratio of each of the holding frames.

5. The brightness adjustment method according to claim 4, characterized in that, The controlling the preset black insertion ratio of the set-th holding frame to be the set black insertion ratio and controlling the average brightness of the set-th holding frame to be the set average brightness specifically includes: When m is an even number, controlling the preset black insertion ratio of the m / 2-th holding frame to be the average black insertion ratio within the refresh period, and controlling the average brightness of the m / 2-th holding frame to be the average of the maximum brightness value and the minimum brightness value; When m is an odd number, controlling the preset black insertion ratio of the (m + 1) / 2-th holding frame to be the average black insertion ratio within the refresh period, and controlling the average brightness of the (m + 1) / 2-th holding frame to be the average of the maximum brightness value and the minimum brightness value.

6. The brightness adjustment method according to claim 2, characterized in that, The performing a filtering process on the actual display brightness curve to obtain a deformed brightness curve specifically includes: Modulating the actual display brightness curve with a Jeita factor to obtain the deformed brightness curve.

7. The brightness adjustment method according to claim 1, characterized in that, After determining the preset black insertion ratio of each of the holding frames, further including: Adjust the black insertion ratio of each of the holding frames to the corresponding preset black insertion ratio.

8. The brightness adjustment method according to any one of claims 1-7, characterized in that, The refresh rate is 60 Hz or less.

9. A brightness adjustment device for a display panel, characterized in that, Comprising: An actual brightness acquisition module, an average brightness determination module, and a preset black insertion ratio determination module; The actual brightness acquisition module is configured to acquire a plurality of actual display brightnesses of the display panel within a preset period and the refresh rate of the display panel, wherein the preset period is greater than or equal to the refresh period of the display panel, the refresh period includes at least m holding frames, m≥1, and m is an integer; the holding frames include a black insertion segment and a light-emitting segment; The average brightness determination module is configured to determine the average brightness of each of the holding frames within the refresh period according to the plurality of actual display brightnesses and the refresh rate; The preset black insertion ratio determination module is configured to control the modulation brightness of each of the holding frames to be equal and keep the overall black insertion ratio within a single refresh period unchanged, so as to determine the preset black insertion ratio of each of the holding frames, wherein the modulation brightness is the ratio of the average brightness to the preset light-emitting ratio, and the overall black insertion ratio is the sum of all black insertion ratios within the refresh period.

10. The brightness adjustment device according to claim 9, characterized in that,The average brightness determination module includes an actual brightness curve determination unit, a curve processing unit, a brightness acquisition unit, and an average brightness determination unit; The actual brightness curve determination unit is configured to determine the actual display brightness curve of the display panel according to the plurality of actual display brightnesses within the preset period; The curve processing unit is configured to perform filtering processing on the actual display brightness curve to obtain a deformed brightness curve, wherein the time interval from the maximum brightness value to the minimum brightness value in the deformed brightness curve is the refresh period; The brightness acquisition unit is configured to acquire the maximum brightness value and the minimum brightness value in the deformed brightness curve; The average brightness determination unit is configured to determine the average brightness of each of the holding frames within the refresh period according to the maximum brightness value, the minimum brightness value, and the refresh rate.

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