Brightness compensation method of display device, chip and display device

Abstract

The invention relates to the technical field of display, and discloses a brightness compensation method of a display device, a chip and the display device. The brightness compensation method comprises the following steps: acquiring a gamma preset value; obtaining a to-be-compensated display brightness value and a light-emitting control signal input and output difference deviation value; generating the pulse width of the low-level input signal before processing in the light-emitting initial signal through the brightness control table; obtaining the minimum change pulse width after the low-level input signal in the light-emitting initial signal is processed, and obtaining a gamma index value through calculation of a gamma index value calculation module; searching a gamma compensation value corresponding to the gamma index value through a gamma index value and gamma compensation value relation lookup table; and jointly outputting the gamma preset value and the gamma compensation value as an actual gamma value after brightness compensation. The chip is used for executing the brightness compensation method. The display device performs brightness compensation by adopting the brightness compensation method. The display brightness jump can be improved, the display quality can be improved, and the user experience is ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and particularly to a brightness compensation method, a chip, and a display device for a display device. Background Art

[0002] In display technologies, Organic Light Emitting Diode (OLED) displays are recognized by the industry as the third-generation display technology after Liquid Crystal Display (LCD) due to their many advantages such as being thin and light, actively emitting light, having a fast response speed, a wide viewing angle, rich colors, high brightness, low power consumption, and being resistant to high and low temperatures. Among them, Active Matrix OLED (AMOLED) can achieve large-size and high-resolution panel designs and has become a current research hotspot.

[0003] However, when driving a display with an existing display panel, due to limitations of the driving circuit, there is often a problem that the display brightness changes jumpily and is perceived by the user's eyes, which seriously affects the display effect and the user experience.

[0004] Therefore, it is a technical problem urgently to be solved by those skilled in the art to provide a brightness compensation method, a chip, and a display device for a display device that can effectively achieve brightness compensation for the display panel, improve the jump of the display brightness, is beneficial to improving the display quality, and ensures the user experience. Summary of the Invention

[0005] To solve the above technical problems, the present disclosure provides a brightness compensation method, a chip, and a display device for a display device.

[0006] The present disclosure provides a brightness compensation method for a display device, including:

[0007] Obtaining a gamma preset value;

[0008] Obtaining a display brightness value to be compensated and a difference offset value between the input and output of a light emission control signal;

[0009] According to the difference offset value between the input and output of the light emission control signal and the display brightness value to be compensated, generating a pulse width of a low-level input signal before processing in a light emission start signal through a brightness control table;

[0010] Obtaining a minimum change pulse width of the low-level input signal after processing in the light emission start signal, and calculating a gamma index value through a gamma index value calculation module according to the pulse width of the low-level input signal before processing in the light emission start signal;

[0011] The gamma compensation value corresponding to the gamma index value is obtained by looking up a pre-set relationship lookup table between the gamma index value and the gamma compensation value;

[0012] The gamma preset value and the gamma compensation value are jointly output as the actual gamma value corresponding to the display brightness value to be compensated.

[0013] Based on the same inventive concept, the present disclosure also provides a chip for performing the above brightness compensation method.

[0014] Based on the same inventive concept, the present disclosure also provides a display device that performs brightness compensation using the above brightness compensation method.

[0015] The technical solution provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0016] The brightness compensation method for the display device provided by the present disclosure can improve the brightness adjustment accuracy and avoid the step-like jump of the display brightness when the display device uses a light emission control signal for dimming. Specifically, the brightness compensation method for the display device of the present disclosure is as follows: First, obtain the gamma preset value, which can be understood as the original gamma value preset before brightness compensation. Then, obtain the display brightness value to be compensated and the input-output difference offset value of the light emission control signal. The pulse width of the low-level input signal in the light emission start signal before processing can be generated through a brightness control table. Next, obtain the minimum variable pulse width of the low-level input signal in the light emission start signal after processing. The minimum variable pulse width of the low-level input signal in the light emission start signal after processing is preset and represents the minimum variable pulse width of the start low-level input signal of the light emission signal control circuit in the gate drive circuit. Based on obtaining the minimum variable pulse width of the low-level input signal in the light emission start signal after processing, according to the pulse width of the low-level input signal in the light emission start signal corresponding to the display brightness value to be compensated obtained in the previous step, through the gamma index value calculation module, the gamma index value can be calculated. Then, through a preset lookup table of the relationship between the gamma index value and the gamma compensation value, the gamma compensation value corresponding to the gamma index value can be found, that is, the gamma compensation value corresponding to the display brightness value to be compensated is obtained. Finally, the gamma compensation value is superimposed on the gamma preset value and jointly output as the actual gamma value corresponding to the display brightness value to be compensated, and is input into the gamma register to drive the display panel of the display device to emit light and display. Since the brightness compensation method for the display device provided by the present disclosure generates gamma compensation for the display brightness value to be compensated, that is, during the dimming process, at the display brightness value where the display brightness value changes while the duty cycle of the light emission control signal remains unchanged and the display brightness is almost unchanged, so that the display brightness also slightly changes at the corresponding display brightness value to be compensated. In this way, there is a smooth brightness change process during the dimming process, avoiding the step mutation of the display brightness, effectively realizing the brightness compensation for the display panel, improving the display brightness jump, being beneficial to improving the display quality, and ensuring the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1It is a schematic diagram showing the display brightness of a display device and the duty cycle of a light emission control signal varying with the display brightness value in the prior art;

[0020] Figure 2 It is a schematic flowchart of a brightness compensation method for a display device provided by an embodiment of the present disclosure;

[0021] Figure 3 It is Figure 2 the flowchart timing diagram of;

[0022] Figure 4 It is after adopting Figure 2 a schematic diagram showing the display brightness of a display device and the duty cycle of a light emission control signal varying with the display brightness value after the brightness compensation method;

[0023] Figure 5 It is for the application of Figure 2 a schematic plan view of a display device with the brightness compensation method;

[0024] Figure 6 It is a schematic diagram showing the linear correspondence between the display brightness value node and the low - level pulse width duty cycle of the light emission control signal provided by an embodiment of the present disclosure;

[0025] Figure 7 It is another schematic flowchart of a brightness compensation method for a display device provided by an embodiment of the present disclosure;

[0026] Figure 8 It is another schematic flowchart of a brightness compensation method for a display device provided by an embodiment of the present disclosure;

[0027] Figure 9 It is Figure 5 a circuit block diagram included in the driving chip in;

[0028] Figure 10 It is after adopting Figure 2 a position comparison diagram of the fine - tuning step positions of gamma compensation values and the original brightness positions after the brightness compensation method. Specific Embodiments

[0029] In order to more clearly understand the above - mentioned objects, features, and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all of the embodiments.

[0031] In the prior art, when a display device drives light emission for display, due to the limitation of the driving circuit of the display panel, the change precision of the duty ratio of the light emission control signal of the display panel is less than the change precision of the DBV (Display Brightness Value). Suppose the driving method of a certain display panel is that one driving circuit drives two rows of light-emitting devices. Then, the duty ratio of the light emission control signal (EM signal, i.e., Emit signal) of the display panel changes only once every four rows. Taking the resolution of this display panel as 2400 rows as an example, the maximum number of changes in the duty ratio of the light emission control signal is at most 2400 / 4 = 600 times, while the number of changes in the DBV corresponding to the dimming of the light emission control signal (i.e., EM dimming) is about 1000 times or more. Therefore, the change precision of the duty ratio of the light emission control signal of the display panel is less than the change precision of the DBV value. Taking a certain project known to the applicant as an example, the number of changes in the DBV value of the display panel is 1184 times, while the number of changes in the duty ratio of the light emission control signal is only 546 times.

[0032] Therefore, due to the limitation of the change precision of the duty ratio of the light emission control signal of the display panel, the duty ratio of the light emission control signal of the display panel changes in a step-like manner as the DBV value changes, and the brightness of the display panel also shows a step-like change. For example, as Figure 1 shown, Figure 1 is a schematic diagram showing the display brightness and the duty ratio of the light emission control signal of a display device in the prior art changing with the display brightness value, where Lum represents the display brightness of the display panel, with the unit of nit; EM duty represents the duty ratio of the light emission control signal of the display panel, with the unit of percent, i.e., percentage. It can be Figure 1 seen that the DVB value changes by 60 times from 500 to 560, while the EM duty, i.e., the duty ratio of the light emission control signal of the display panel, changes in a step-like and jumpy manner. The DVB value changes by 60 times from 500 to 560, and the EM duty only changes 12 times (the reason is that the duty ratio of the light emission control signal of the display panel changes only once every four rows). That is to say, during the EM dimming process, when some DBV values change, the EM duty does not change. Only when the DBV value becomes some specific DBV values, the EM duty will change, and the display brightness will also change jumpily. That is, at a certain DBV value, when the duty ratio of the light emission control signal of the display panel changes jumpily, the display brightness also changes jumpily at this DBV value. And this jumpy change in the display brightness is easily perceptible to the user's eyes, seriously affecting the display effect and the user experience.

[0033] Therefore, in the prior art during EM dimming, the EM Duty changes in a step-like manner with the DBV value, and similarly, the display brightness also changes in steps with the DBV value. As a result, the accuracy of the display brightness change with the DBV value is not high. In severe cases, the user's naked eyes can perceive the problem of brightness jump.

[0034] Based on the above problems, the present application proposes a brightness compensation method, a chip, and a display device for a display device, which can effectively achieve the compensation of the display brightness, improve the brightness jump of the display, is beneficial to improving the display quality, and ensures the user experience. The specific embodiments of the brightness compensation method, the chip, and the display device proposed in the present application are described in detail as follows.

[0035] Please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic flowchart of a brightness compensation method for a display device provided by an embodiment of the present disclosure. Figure 3 is Figure 2 The timing diagram of the process. A brightness compensation method for a display device provided in this embodiment includes:

[0036] S10: Obtain the gamma preset value GammaLevel;

[0037] S11: Obtain the display brightness value DBV to be compensated (x) and the difference offset value EM_Low_Offset between the input and output of the light emission control signal;

[0038] S12: According to the difference offset value EM_Low_Offset between the input and output of the light emission control signal and the display brightness value DBV to be compensated (x) , generate the pulse width EM_Low_In of the low-level input signal before processing in the light emission start signal through a brightness control table (i.e., BC table);

[0039] S13: Obtain the minimum change pulse width EM_step of the low-level input signal after processing in the light emission start signal, and calculate the gamma index value Gamma Level Index through a gamma index value calculation module (i.e., GammaLevel Index Calculate) according to the pulse width EM_Low_In of the low-level input signal before processing in the light emission start signal;

[0040] S14: Look up the gamma compensation value Gamma Leveloffset corresponding to the gamma index value Gamma Level Index through a preset lookup table of the relationship between the gamma index value and the gamma compensation value (i.e., GammaLevel Index Tooffset LUT);

[0041] S15: The gamma preset value Gamma Level and the gamma compensation value Gamma Level offset are jointly output as the display brightness value to be compensated DBV (x) The corresponding actual gamma value Gamma (x) .

[0042] Specifically, the brightness compensation method of the display device provided in this embodiment can improve the brightness adjustment accuracy and avoid the display brightness from jumping in a stepped manner when the display device uses a light emission control signal for dimming. The brightness compensation method of the display device provided in this embodiment compensates the brightness for some DBV values corresponding to the situation where certain DBV values change while the EM duty remains unchanged during the EM dimming process. For example Figure 1 in, during the process from the DBV value of 500 to the DBV value of 503, since the EM duty remains unchanged, the display brightness Lum also remains unchanged. Only when the DBV value becomes 504 does the display brightness suddenly change following the change of the EM duty. Then the brightness compensation in this embodiment is for the actual gamma values obtained after compensation corresponding to the DBV values of 501 - 503 respectively. Specifically, the brightness compensation method of the display device in this embodiment is as follows: First, obtain the gamma preset value GammaLevel. The gamma preset value GammaLevel can be understood as the preset original gamma value that does not cause the display brightness to change before brightness compensation. Then obtain the display brightness value to be compensated DBV (x) and the input and output difference offset value of the light emission control signal EM_Low_Offset; among them, the display brightness value to be compensated DBV (x) can be understood as the corresponding DBV value that needs to be compensated for brightness, such as Figure 1 in, except for the DBV values of 500, 504, 508, 512, etc. where the display brightness changes, all other DBV values are the corresponding DBV values that need to be compensated for brightness; and the input and output difference offset value of the light emission control signal EM_Low_Offset represents the preset difference offset value between the input and output of the preset light emission control signal, i.e., the EM signal, in the EM dimming mode. According to the display brightness value to be compensated DBV (x) , the pulse width EM_Low_In of the low-level input signal in the light emission start signal before processing can be generated through the brightness control table (i.e., the BC table). Specifically, the brightness control table, i.e., the BC table, is a preset table corresponding to each display brightness value node, i.e., the DBV node, and the pulse width EM_Low_Innode of the low-level input signal in each light emission start signal before processing. If in the brightness control table, the display brightness value to be compensated DBV (x) is located between the DBVnode (1) value and the DBVnode (2)If it is between the values, then the display brightness value to be compensated, DBV (x) The pulse width of the low-level input signal in the corresponding light-emitting start signal before processing, EM_Low_Innode (x) Is also at DBVnode (1) The EM_Low_Innode corresponding to the value (1) And DBVnode (2) The EM_Low_Innode corresponding to the value (2) If in the brightness control table, the display brightness value to be compensated, DBV (x) Is located between the DBVnode (6) Value and the DBV node (7) Value, then the display brightness value to be compensated, DBV (x) The pulse width of the low-level input signal in the corresponding light-emitting start signal before processing, EM_Low_Innode (x) Is also at DBVnode (6) The EM_Low_Innode corresponding to the value (6) And DBVnode (7) The EM_Low_Innode corresponding to the value (7) Between; then by looking up the brightness control table, the obtained EM_Low_Innode (1) And EM_Low_Innode (2) , and the light-emitting control signal input and output difference offset value EM_Low_Offset, the pulse width of the low-level input signal in the corresponding light-emitting start signal before processing, EM_Low_Innode (x) Of the display brightness value to be compensated, DBV (x) Can be generated.

[0043] Next, obtain the minimum change pulse width EM_step after processing the low-level input signal of the light-emitting start signal. The minimum change pulse width EM_step after processing the low-level input signal of the light-emitting start signal is also preset, which represents the minimum change pulse width after processing the start low-level input signal of the light-emitting signal control circuit in the gate drive circuit; on the basis of obtaining the minimum change pulse width EM_step after processing the low-level input signal of the light-emitting start signal, and according to the display brightness value to be compensated, DBV (x)The pulse width EM_Low_In of the low-level input signal in the corresponding light emission start signal before processing is calculated by the gamma index value calculation module (i.e., Gamma Level Index Calculate) to obtain the gamma index value Gamma Level Index. The gamma index value calculation module is integrated in a driving chip such as an IC and is used to convert and calculate the light emission control signal, i.e., the EM signal, etc., to obtain the corresponding gamma signal. That is, through the gamma index value calculation module, the display brightness value to be compensated DBV is calculated. (x) The corresponding gamma index value Gamma Level Index. Then, through a preset relationship lookup table between the gamma index value and the gamma compensation value (i.e., GammaLevel Index To offset LUT), the gamma compensation value Gamma Level offset corresponding to the gamma index value Gamma Level Index is found, that is, the display brightness value to be compensated DBV is obtained. (x) The corresponding gamma compensation value Gamma Level offset. Finally, the gamma compensation value Gamma Level offset is superimposed on the gamma preset value Gamma Level and jointly output as the display brightness value to be compensated DBV. (x) The corresponding actual gamma value Gamma (x) , and is input into the gamma register to drive the display panel of the display device to emit light and display.

[0044] Since the brightness compensation method of the display device provided in this embodiment is for the display brightness value to be compensated DBV (x) , that is, in EM dimming, at the DBV value where although the DBV value changes but the EM duty remains unchanged and the display brightness is almost unchanged originally, gamma compensation is generated, so that at the corresponding display brightness value to be compensated DBV (x) , the display brightness also changes slightly. In this way, there is a smooth brightness change process as a whole during the dimming process, avoiding step mutations in the display brightness, being able to effectively implement the brightness compensation for the display panel, improving the display brightness jump, being beneficial to improving the display quality, and ensuring the user experience.

[0045] Such as Figure 1 and Figure 4 shown, Figure 4 is a schematic diagram showing the change of the display brightness and the duty cycle of the light emission control signal of the display device after adopting the Figure 2 brightness compensation method, where Lum represents the change trend of the display brightness of the display device in this embodiment, with the unit of nit; EM duty represents the duty cycle of the light emission control signal of the display device in this embodiment, with the unit of percent, i.e., percentage. Comparing Figure 1 and Figure 4It can be known that the change of the display brightness of the existing display device shows a similar stepped change (such as Figure 1 the stepped change trend therein), and the brightness mutation only occurs at certain DBV values. After adopting the brightness compensation method provided in this embodiment, gamma compensation is performed at some specific display brightness values DBV to be compensated (x) , thereby making the change process of the display brightness relatively smooth (such as Figure 4 the change trend shown by the dotted line K therein, Figure 4 the display brightness Lum graph indicated by the dotted line shows the change of the display brightness under EM dimming in the prior art), avoiding the occurrence of brightness mutation, which is beneficial to improving the smoothness of the brightness change of the entire picture, and further improving the display quality.

[0046] In some alternative embodiments, please refer to Figures 2 - 4 、 Figure 5 and Figure 6 for combination. Figure 5 is a schematic plan view of a display device applying the Figure 2 brightness compensation method, Figure 6 is a schematic linear correspondence diagram between the display brightness value node and the low-level pulse width duty ratio of the light emission control signal provided in the embodiment of the present disclosure. The display device 111 adopting the Figure 2 embodiment of the brightness compensation method includes a display panel 000, and the display panel 000 includes a light emission control circuit 10 and a light emission module 20 that are electrically connected. The light emission control circuit 10 is used to provide a light emission control signal EM for the light emission module 20; optionally, the display panel 000 may include a display area AA and a non-display area NA, and the light emission control circuit 10 may be located in the non-display area NA, that is, the border area of the display panel 000. The light emission module 20 may be a circuit module included in the pixel circuit of the display panel 000, and the light emission control circuit 10 may provide the light emission control signal EM for the light emission module 20 through a light emission control signal line; it can be understood that in the Figure 5 of this embodiment, only the light emission control circuit 10 and the light emission module 20 are schematically shown in a block diagram. In actual implementation, the structure of the display panel 000 includes but is not limited to this, and the actual structure of the display panel in related technologies can be specifically referred to for understanding.

[0047] It can be understood that the brightness compensation method of this embodiment can be executed by a driving chip bound to the display panel 000, that is, the non-display area NA of the display device 000, such as the lower border area, can be bound with a driving chip or can be bound with a driving chip through a flexible circuit board. The module implementing the above brightness compensation method is integrated in the driving chip, and the brightness compensation can be performed when the display panel 000 is dimmed.

[0048] In the brightness compensation method of the display device 111 provided in this embodiment, when obtaining the display brightness value DBV to be compensated(x) Before that, it also includes determining a target display brightness value (DBV) range, where the target display brightness value range includes multiple display brightness value nodes (DBV node). Different display brightness value nodes (DBV node) correspond to different low-level pulse width duty ratios of the light-emitting control signal (i.e., if the light-emitting control signal EM is low-level enabled, it represents the pulse width (EM_Low_In) of the low-level input signal in the light-emitting start signal before processing); among them, the display brightness value to be compensated (DBV) (x) is located between two adjacent display brightness value nodes (DBV node).

[0049] This embodiment explains that when the display device 111 is dimmed, the display brightness levels are equivalent to individual display brightness value nodes (DBV node). The entire DBV value range is divided into multiple target display brightness value (DBV) ranges corresponding to multiple display brightness levels respectively. There is a PWM dimming range corresponding to between two adjacent display brightness levels, and different PWM dimming ranges correspond to different PWM duty ratio ranges. In PWM dimming, usually, the display brightness corresponding to the display brightness value range is adjusted by adjusting the low-level pulse width duty ratio (EM duty) (or high-level pulse width duty ratio) of the light-emitting control signal EM in the pixel circuit and the data voltage provided to the pixel circuit. The low-level pulse width duty ratio (or high-level pulse width duty ratio) of the light-emitting control signal EM is used to control the light-emitting time of the light-emitting device within one frame, and the magnitude of the data voltage is used to control the driving current flowing through the light-emitting device. The data voltage is generally provided by the driving chip, and the display screen is driven to emit light by the driving chip. The data voltage exists in the form of a gamma register value in the driving chip. Therefore, the dimming scheme involved in this embodiment is to adjust the display brightness by adjusting the low-level pulse width duty ratio of the light-emitting control signal in the pixel circuit (i.e., if the light-emitting control signal EM is low-level enabled, it represents the pulse width (EM_Low_In) of the low-level input signal in the light-emitting start signal before processing) and the gamma register value.

[0050] The entire DBV value range can be divided into multiple target display brightness value (DBV) ranges corresponding to multiple display brightness levels respectively. The target display brightness value range includes multiple display brightness value nodes (DBV node), such as Figure 6 the shown DBVnode (1) 、DBV node (2) ……DBV node (n) 、DBV node (n+1) ……DBV node (10), the duty cycle of the low-level pulse width of the light emission control signal corresponding to different display brightness value nodes (i.e., if the light emission control signal EM is low-level enabled, it represents the pulse width EM_Low_In node of the low-level input signal in the light emission start signal before processing) is different, such as DBVnode (1) The duty cycle of the low-level pulse width of the corresponding light emission control signal, that is, the pulse width of the low-level input signal in the light emission start signal before processing, is EM_Low_In node (1) , DBV node (2) The duty cycle of the low-level pulse width of the corresponding light emission control signal, that is, the pulse width of the low-level input signal in the light emission start signal before processing, is EM_Low_In node (2) ……DBV node (n) The duty cycle of the low-level pulse width of the corresponding light emission control signal, that is, the pulse width of the low-level input signal in the light emission start signal before processing, is EM_Low_In node (n) , DBV node (n+1) The duty cycle of the low-level pulse width of the corresponding light emission control signal, that is, the pulse width of the low-level input signal in the light emission start signal before processing, is EM_Low_In node (n+1) ……DBV node (10) The duty cycle of the low-level pulse width of the corresponding light emission control signal, that is, the pulse width of the low-level input signal in the light emission start signal before processing, is EM_Low_In node (10) . Among them, the display brightness value to be compensated, DBV (x) is located between two adjacent display brightness value nodes, DBVnode, such as the display brightness value to be compensated, DBV (x) can be located between DBV node (1) and DBV node (2) , or can be located between DBV node (n) and DBV node (n+1) and so on.

[0051] Since the brightness control table, i.e., the BC table, is a pre-set table corresponding to each display brightness value node, i.e., DBV node, and the pulse width EM_Low_In node of the low-level input signal in each light emission start signal, therefore, if in the brightness control table, it is found that the display brightness value to be compensated, DBV (x) is located between the DBVnode (1) value and the DBV node (2) value, then the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value to be compensated, DBV (x) (x) ​Also at the DBVnode (1) The EM_Low_Innode corresponding to the value (1) And the DBVnode (2) The EM_Low_Innode corresponding to the value (2) Between; then by looking up the brightness control table, the found EM_Low_Innode (1) And EM_Low_Innode (2) , and through the preset difference offset value EM_Low_Offset of the input and output of the light emission control signal, the display brightness value DBV to be compensated can be generated (x) The pulse width EM_Low_Innode of the low-level input signal of the light emission start signal corresponding to the value before processing (x) . If in the brightness control table, the display brightness value DBV to be compensated (x) Is located between the DBVnode (n) Value and the DBV node (n+1) Value, then the display brightness value DBV to be compensated (x) The pulse width EM_Low_Innode of the low-level input signal of the light emission start signal corresponding to the value (x) Is also at the DBVnode (n) The EM_Low_Innode corresponding to the value (n) And the DBVnode (n+1) The EM_Low_Innode corresponding to the value (n+1) Between; then by looking up the brightness control table, the found EM_Low_Innode (n) And EM_Low_Innode (n+) , and through the preset difference offset value EM_Low_Offset of the input and output of the light emission control signal, the display brightness value DBV to be compensated can be generated (x) The pulse width EM_Low_Innode of the low-level input signal of the light emission start signal corresponding to the value (x) .

[0052] Optionally, as Figures 2 - 6 、 Figure 7 Shown, Figure 7 Is another flow schematic block diagram of the brightness compensation method of the display device provided by the embodiment of the present disclosure. In this embodiment, the brightness compensation method of the display device includes:

[0053] S20: Obtain the gamma preset value GammaLevel;

[0054] S21: Obtain the display brightness value DBV to be compensated (x)And the light emission control signal input and output difference offset value EM_Low_Offset;

[0055] According to the light emission control signal input and output difference offset value EM_Low_Offset and the display brightness value to be compensated DBV (x) , generate the pulse width EM_Low_In of the low-level input signal before processing in the light emission start signal through the brightness control table (i.e., BC table); that is, the brightness control table BC table is based on the linear interpolation method, interpolates and calculates the display brightness value to be compensated DBV (x) The corresponding pulse width EM_Low_Innode of the low-level input signal before processing in the light emission start signal (x) . Specifically:

[0056] S221: The target display brightness value range includes adjacent first display brightness value nodes DBVnode (n) and second display brightness value nodes DBVnode (n+1) , and the display brightness value to be compensated DBV (x) is located between the first display brightness value node DBVnode (n) and the second display brightness value node DBVnode (n+1) ;

[0057] S222: The brightness control table BC table is based on the linear interpolation method to obtain the first pulse width corresponding to the first display brightness value node DBVnode (n) and the second pulse width corresponding to the second display brightness value node DBVnode (n+1) ;

[0058] S223: According to the first pulse width, the second pulse width, and the light emission control signal input and output difference offset value EM_Low_Offset, based on the linear interpolation calculation formula:

[0059] EM_Low_Innode (x) =LinearInterpoltatin(DBV node (n) , EM_Low_In

[0060] node (n) , DBV node (n+1) , EM_Low_In node (n+1) , DBV (x) )+EM_Low_Offset;

[0061] S224: Calculate the third pulse width corresponding to the display brightness value to be compensated DBV (x) ;

[0062] Among them, the first pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the first display brightness value node DBVnode (n) before processing (n) ; the second pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the second display brightness value node DBVnode (n+1) before processing (n+1) ; the third pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (x) before processing (x) .

[0063] S23: Obtain the minimum change pulse width EM_step after processing the low-level input signal in the light emission start signal, and calculate the gamma index value Gamma Level Index through the gamma index value calculation module (i.e., GammaLevel Index Calculate) according to the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (x) before processing (x) .

[0064] S24: Look up the gamma compensation value Gamma Leveloffset corresponding to the gamma index value Gamma Level Index through the preset gamma index value and gamma compensation value relationship lookup table (i.e., GammaLevel Index Tooffset LUT).

[0065] S25: The gamma preset value Gamma Level and the gamma compensation value Gamma Level offset are jointly output as the actual gamma value Gamma corresponding to the display brightness value DBV to be compensated (x) before processing (x) .

[0066] This embodiment explains that in the brightness compensation method, according to the input and output difference offset value EM_Low_Offset of the light emission control signal and the display brightness value DBV to be compensated (x) , generate the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal before processing through the brightness control table BC table (x) , including: The brightness control table BC table interpolates and calculates the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated based on the linear interpolation method (x) before processing (x) . Specifically

[0067] The target display brightness value range includes adjacent first display brightness value nodes DBVnode (n) and second display brightness value nodes DBVnode (n+1) , and the display brightness value to be compensated DBV (x) is located between the first display brightness value node DBVnode (n) and the second display brightness value node DBVnode (n+1) .

[0068] Based on the linear interpolation method, the brightness control table BC table obtains the first pulse width corresponding to the first display brightness value node DBVnode (n) and the second pulse width corresponding to the second display brightness value node DBVnode (n+1) .

[0069] According to the first pulse width, the second pulse width, the input and output difference offset value EM_Low_Offset of the light emission control signal, based on the linear interpolation calculation formula:

[0070] EM_Low_Innode (x) = LinearInterpoltatin(DBV node (n) , EM_Low_In

[0071] node (n) , DBV node (n+1) , EM_Low_In node (n+1) , DBV (x) ) + EM_Low_Offset;

[0072] Calculate the third pulse width corresponding to the display brightness value DBV to be compensated (x) .

[0073] Among them, the first pulse width is the pulse width EM_Low_Innode (n) of the low-level input signal in the light emission start signal corresponding to the first display brightness value node DBVnode before being processed (n) , the second pulse width is the pulse width EM_Low_Innode (n+1) of the low-level input signal in the light emission start signal corresponding to the second display brightness value node DBVnode before being processed (n+1) , and the third pulse width is the pulse width EM_Low_Innode (x) of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated before being processed (x) .

[0074] The LinearInterpoltatin in this embodiment represents a linear interpolation function. The brightness control table set through this function can only find the pulse width EM_Low_Innode of the low-level input signal of the light-emitting start signal corresponding to each display brightness value node DBVnode before processing. For non-display brightness value nodes, it is necessary to first find the pulse width EM_Low_Innode of the low-level input signal of the light-emitting start signal corresponding to each adjacent display brightness value node DBVnode through the brightness control table BC table, and then add the offset value, that is, add the light-emitting control signal input and output difference offset value EM_Low_Offset, to obtain the display brightness value DBV to be compensated. (x) The pulse width EM_Low_Innode of the low-level input signal of the corresponding light-emitting start signal before processing (x) .

[0075] In some alternative embodiments, please refer to Figures 2 - 6 、 Figure 8 , Figure 8 which is another flowchart block diagram of the brightness compensation method for the display device provided by the embodiments of the present disclosure. In this embodiment, the brightness compensation method for the display device includes:

[0076] S30: Obtain the gamma preset value GammaLevel;

[0077] S31: Obtain the display brightness value DBV to be compensated (x) and the light-emitting control signal input and output difference offset value EM_Low_Offset;

[0078] According to the light-emitting control signal input and output difference offset value EM_Low_Offset and the display brightness value DBV to be compensated (x) , generate the pulse width EM_Low_In of the low-level input signal of the light-emitting start signal before processing through the brightness control table (i.e., BC table); that is, the brightness control table BC table is based on the linear interpolation method, interpolates and calculates to obtain the pulse width EM_Low_Innode of the low-level input signal of the light-emitting start signal corresponding to the display brightness value DBV to be compensated (x) The pulse width EM_Low_Innode of the low-level input signal of the corresponding light-emitting start signal before processing (x) . Specifically:

[0079] S321: The target display brightness value range includes adjacent first display brightness value nodes DBVnode (n) and second display brightness value nodes DBVnode (n+1) , and the display brightness value DBV to be compensated (x) is located at the first display brightness value node DBVnode (n)and the second display brightness value node DBVnode (n+1) between;

[0080] S322: The brightness control table BC table obtains the first display brightness value node DBVnode (n) corresponding to the first pulse width, and the second display brightness value node DBVnode (n+1) corresponding to the second pulse width;

[0081] S323: According to the first pulse width, the second pulse width, the input and output difference offset value EM_Low_Offset of the light emission control signal, based on the linear interpolation calculation formula:

[0082] EM_Low_Innode (x) =LinearInterpoltatin(DBV node (n) , EM_Low_In

[0083] node (n) , DBV node (n+1) , EM_Low_In node (n+1) , DBV (x) )+EM_Low_Offset;

[0084] S324: Calculate the third pulse width corresponding to the display brightness value DBV to be compensated (x) ;

[0085] Among them, the first pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the first display brightness value node DBVnode (n) before processing, the second pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the second display brightness value node DBVnode (n) before processing, and the third pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (n+1) before processing, the fourth pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (n+1) before processing, and the fifth pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (x) before processing, the sixth pulse width is the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (x) .

[0086] S33: Obtain the minimum change pulse width EM_step after processing the low-level input signal of the light emission start signal, and according to the pulse width EM_Low_Innode of the low-level input signal in the light emission start signal corresponding to the display brightness value DBV to be compensated (x) before processing (x), through the gamma index value calculation module (i.e., GammaLevel Index Calculate), the gamma index value Gamma Level Index is calculated, specifically as follows:

[0087] Gamma Level Index = EM_Low_In % EM_step; where Gamma Level Index represents the gamma index value, and EM_Low_In represents the display brightness value to be compensated DBV (x) The pulse width of the low-level input signal in the corresponding light-emitting start signal before processing, and EM_step represents the minimum variable pulse width of the low-level input signal in the light-emitting start signal after processing.

[0088] S34: Through the preset gamma index value and gamma compensation value relationship lookup table (i.e., GammaLevel Index Tooffset LUT), the gamma compensation value Gamma Leveloffset corresponding to the gamma index value Gamma Level Index is found;

[0089] S35: The gamma preset value Gamma Level and the gamma compensation value Gamma Level offset are jointly output as the display brightness value to be compensated DBV (x) The corresponding actual gamma value Gamma (x) .

[0090] This embodiment explains that after obtaining the minimum variable pulse width EM_step of the low-level input signal in the light-emitting start signal after processing, and the pulse width EM_Low_In node(x) of the low-level input signal in the light-emitting start signal corresponding to the display brightness value to be compensated DBV(x) before processing, the gamma index value Gamma Level Index can be calculated through the gamma index value calculation module (i.e., Gamma Level Index Calculate) integrated in the driving chip. The specific calculation process is that the gamma index value calculation module can implement the calculation of the gamma index value, Gamma Level Index = EM_Low_In % EM_step; where EM_Low_In represents the pulse width of the low-level input signal in the light-emitting start signal corresponding to the display brightness value to be compensated DBV(x) before processing, that is, EM_Low_Innode (x), EM_step represents the minimum change pulse width after processing the low-level input signal in the light emission start signal. When the two are divided and the division is not exact, the remainder obtained is the gamma index value Gamma Level Index corresponding to the display brightness value to be compensated DBV(x). Finally, through the gamma index value and gamma compensation value relationship lookup table preset in the driving chip, the gamma index value and gamma compensation value in the gamma index value and gamma compensation value can be in a one-to-one correspondence relationship. Looking up this table can obtain the gamma compensation value Gamma Level offset corresponding to the gamma index value Gamma Level Index, thereby achieving the gamma brightness compensation effect for the display brightness value to be compensated DBV(x).

[0091] In some alternative embodiments, please continue to refer to Figures 2 - 5 and Figure 9 , Figure 9 is Figure 5 a circuit block diagram included in the driving chip in Figure 2 In this embodiment, the display device 111 adopting the brightness compensation method of

[0092] embodiment includes a driving chip 30; the driving chip 30 is integrally provided with a gamma preset value generation circuit 301, a gamma compensation value generation circuit 302, and a gamma register 303;

[0093] The gamma preset value generation circuit 301 is configured to generate a gamma preset value Gamma Level;

[0094] The output ends of the gamma preset value generation circuit 301 and the gamma compensation value generation circuit 302 are both electrically connected to the gamma register 303.

[0095] This embodiment explains that the above brightness compensation method can be executed by integrating the gamma preset value generation circuit 301 and the gamma compensation value generation circuit 302 in the driving chip 30. Among them, the gamma preset value generation circuit 301 is a module structure that is generally integrated in the driving chip 30. After the gamma preset value generation circuit 301 in the prior art generates the gamma preset value GammaLevel, it directly outputs it to the gamma register 303, and then adjusts the display brightness through the gamma register 303. In this embodiment, by adding an integrated gamma compensation value generation circuit 302 in the driving chip 30, the gamma compensation value generation circuit 302 is configured to be used according to Figure 2The brightness compensation method of the embodiment generates a gamma compensation value Gamma Level offset, and finally enables the gamma preset value Gamma Level of the gamma preset value generation circuit 301 and the gamma compensation value Gamma Level offset generated by the gamma compensation value generation circuit 302 to be superimposed and fed into the gamma register 303 together from their respective output ends, completing the brightness compensation during the dimming process and improving the display quality.

[0096] Optionally, as Figures 2 - 9 , Figure 10 shown, Figure 10 is a position comparison diagram of the fine-tuning step positions of the gamma compensation value and the original brightness positions after adopting the Figure 2 brightness compensation method. Figure 1 and Figure 10 Lum in Figure 4 represents the display brightness of the display device in the prior art (i.e., the display brightness change trend without adopting the brightness compensation method of this embodiment), Figure 10 Lum in Figure 10 represents the display brightness of the display device in this embodiment (i.e., the display brightness change trend after adopting the brightness compensation method of this embodiment), Figure 1 Gamma Level offset in Figure 4 represents the fine-tuning step position after adopting the gamma compensation value. It can be seen from

[0097] that by adopting the brightness compensation method of this embodiment, after the gamma compensation value is fine-tuned step by step, the actual display brightness can be changed from

[0098] to 12 , thereby improving the smoothness of the brightness change of the entire picture, further improving the display quality, and improving the problem of sudden brightness change.

[0097] Optionally, in this embodiment, the gamma preset value generation circuit 301 generates a gamma preset value according to the preset gray level of the picture to be displayed, that is, by inputting the picture or image to be displayed, the preset gray level of the display picture can be obtained, and then the gamma preset value Gamma Level corresponding to the preset gray level is generated. It can be understood that the principle of the gamma preset value generation circuit 301 generating the gamma preset value Gamma Level in this embodiment will not be elaborated, and specific understanding can be referred to the dimming method in the related technology.

[0098] Optionally, the brightness compensation method provided in this embodiment realizes that the change accuracy of the actual gamma value is consistent with the change accuracy of all display brightness values in the target display brightness value range. This embodiment explains that after adopting the above brightness compensation method, the change accuracy of all display brightness values in the target display brightness value range is 12bit, and the range is 2 12That is, under the change precision of 0 - 4095, the change precision of the actual gamma value presented in the final gamma register 301 of this embodiment can also reach 12 bits, achieving as much as possible the consistency between the change precision of the actual gamma value after compensation and the change precision of all display brightness values in the target display brightness value range. Thus, the effect of optimizing the brightness change precision can be achieved, and the brightness mutation problem caused by the change precision of the duty cycle of the light emission control signal being less than the change precision of the DBV (Display Brightness Value) can be improved, which is beneficial to improving the display quality.

[0099] In some alternative embodiments, please continue to refer to Figure 2 and Figure 5 , this embodiment provides a chip 00. Optionally, the chip 00 can be a driving chip 30, which can be bonded to the non-display area of the display panel 000 through a flexible circuit board to form a display device 111 with the display panel 000. The chip 00 of this embodiment can also be a display driver chip DDIC (Display Driver IC). The 00 of this embodiment is used to execute the brightness compensation method of any of the above embodiments, thereby improving the problem of sudden change in display brightness and enhancing the display quality.

[0100] In some alternative embodiments, please continue to refer to Figure 2 and Figure 5 , this embodiment provides a display device 111, and the display device 111 performs brightness compensation using the brightness compensation method of any of the above embodiments. It can be understood that the display device 111 provided in this embodiment can be a computer, a television, an in-vehicle display device, or other display devices 111 with a display function, and the present invention does not make specific limitations thereto. After adopting the brightness compensation method of any of the above embodiments, the display device 111 provided by the embodiments of the present invention has the beneficial effects provided by the embodiments of the present invention. For the specific description of the brightness compensation method of the display device, reference can be made to the above embodiments, and details are not repeated herein.

[0101] It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0102] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brightness compensation method for a display device, characterized in that: include: Get the gamma preset value; Obtaining a display brightness value to be compensated and an input and output difference offset value of a light emitting control signal; According to the input and output difference offset value of the light emitting control signal and the display brightness value to be compensated, a pulse width of the low-level input signal before being processed in the light emitting start signal is generated through a brightness control table; Obtaining the minimum change pulse width of the low-level input signal in the light-emitting start signal after processing, and calculating the gamma index value through the gamma index value calculation module according to the pulse width of the low-level input signal in the light-emitting start signal before processing; By using a preset gamma index value and gamma compensation value relationship lookup table, a gamma compensation value corresponding to the gamma index value is obtained; The gamma preset value and the gamma compensation value are output together as the actual gamma value corresponding to the display brightness value to be compensated.

2. The brightness compensation method of a display device according to claim 1, characterized in that: The display device further comprises a display panel, wherein the display panel comprises a light emitting control circuit and a light emitting module which are electrically connected, wherein the light emitting control circuit is used to provide a light emitting control signal for the light emitting module; Before obtaining the display brightness value to be compensated, it also includes determining a target display brightness value interval, wherein the target display brightness value interval includes multiple display brightness value nodes, and different display brightness value nodes correspond to different low-level pulse width duty ratios of the light control signal; wherein the display brightness value to be compensated is located between two adjacent display brightness value nodes.

3. The brightness compensation method of a display device according to claim 2, characterized in that: According to the input and output difference offset value of the light emitting control signal and the display brightness value to be compensated, the pulse width of the low-level input signal before being processed in the light emitting start signal is generated through a brightness control table, including: The brightness control table interpolates and calculates the pulse width of the low-level input signal before being processed in the light-emitting start signal corresponding to the display brightness value to be compensated based on the linear interpolation method.

4. The brightness compensation method of a display device according to claim 3, characterized in that: The target display brightness value interval includes a first display brightness value node and a second display brightness value node that are adjacent to each other, and the display brightness value to be compensated is located between the first display brightness value node and the second display brightness value node; The brightness control table obtains, based on a linear interpolation method, that the first display brightness value node corresponds to a first pulse width, and the second display brightness value node corresponds to a second pulse width; According to the first pulse width, the second pulse width, and the input and output difference offset value of the light emitting control signal, a third pulse width corresponding to the display brightness value to be compensated is calculated based on a linear interpolation calculation formula; Among them, the first pulse width is the pulse width of the low-level input signal in the light-emitting start signal corresponding to the first display brightness value node before being processed, the second pulse width is the pulse width of the low-level input signal in the light-emitting start signal corresponding to the second display brightness value node before being processed, and the third pulse width is the pulse width of the low-level input signal in the light-emitting start signal corresponding to the display brightness value to be compensated before being processed.

5. The brightness compensation method of a display device according to claim 4, characterized in that: The linear interpolation calculation formula is: EM_Low_Innode (x) =LinearInterpoltatin(DBV node (n) ,EM_Low_In node (n) ,DBV node (n+1) ,EM_Low_In node (n+1) ,DBV (x) )+EM_Low_Offset; Among them, DBV (x) is the display brightness value to be compensated, EM_Low_Innode (x) is the third pulse width, DBV node (n) The first display brightness value node, EM_Low_In node (n) is the first pulse width, DBV node (n+1) The second display brightness value node, EM_Low_In node (n+1) is the second pulse width, and EM_Low_Offset is the input and output difference offset value of the light emitting control signal.

6. The brightness compensation method of a display device according to claim 1, characterized in that: The minimum change pulse width after the low-level input signal in the light-emitting start signal is obtained, and the gamma index value is calculated by the gamma index value calculation module according to the pulse width of the low-level input signal in the light-emitting start signal before being processed, including: Gamma Level Index=EM_Low_In%EM_step; wherein Gamma Level Index represents the gamma index value, EM_Low_In represents the pulse width of the low-level input signal in the luminous start signal corresponding to the display brightness value to be compensated before being processed, and EM_step represents the minimum change pulse width of the low-level input signal in the luminous start signal after being processed.

7. The brightness compensation method of a display device according to claim 1, characterized in that: The display device comprises a driving chip; the driving chip is integrated with a gamma preset value generating circuit, a gamma compensation value generating circuit and a gamma register; The gamma preset value generating circuit is configured to generate the gamma preset value, and the gamma compensation value generating circuit is configured to generate the gamma compensation value; The output ends of the gamma preset value generating circuit and the gamma compensation value generating circuit are both electrically connected to the gamma register.

8. The brightness compensation method of a display device according to claim 7, characterized in that: The gamma preset value generating circuit generates the gamma preset value according to a preset gray scale of a picture to be displayed.

9. The brightness compensation method of a display device according to claim 2, characterized in that: The variation accuracy of the actual gamma value is consistent with the variation accuracy of all display brightness values ​​in the target display brightness value interval.

10. A chip, characterized in that: The chip is used to execute the brightness compensation method described in any one of claims 1-9.

11. A display device, characterized in that: The display device performs brightness compensation using the brightness compensation method described in any one of claims 1 to 9.

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