Display device and driving method

Abstract

The invention discloses a display device and a driving method, the display device comprises a display panel, a backlight module and a driving module, the driving module comprises a time sequence controller, a gamma chip and a microprogram controller, the display panel is provided with a light sensing module which is used for detecting the brightness of ambient light and is connected with the input end of the microprogram controller, and the light sensing module is connected with the input end of the microprogram controller. The microprogram controller generates a backlight brightness control signal according to the brightness of ambient light detected by the light sensing module and outputs the backlight brightness control signal to the backlight driving chip so as to control the brightness of the backlight source, and the time schedule controller obtains a gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller and inputs the gamma voltage compensation value to the gamma chip so as to control the brightness of the display panel. The linkage function is achieved through two kinds of compensation of the brightness of the display panel and the backlight brightness, the problem of flickering in an anti-tearing mode during high brushing in different environments is effectively solved, and meanwhile the adaptive environment and the picture grade of the high-brushing electronic sports screen are improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a driving method. Background Art

[0002] As mini-LED has advantages such as high contrast and high brightness, more and more displays are equipped with mini-LED, especially in MNT e-sports screen products, and the market demand for high-refresh e-sports screens is also increasing.

[0003] High refresh gaming screens have more stringent requirements on the quality of the picture. In order to prevent problems such as screen tearing during the game, such high-end monitors currently support Freesync (anti-tearing) mode, that is, the refresh rate can be adjusted according to the actual picture. The A-Si material used in the liquid crystal display (LCD) with mini LED backlight has the biggest defect of A-si, which is easy to leak electricity. When the refresh rate is switched, because the time of each line changes, that is, the charging time changes, this will cause the brightness of the picture at different refresh rates to be different. In the case of rapid refresh rate changes, it is easy to have flickering problems, which is not allowed for gaming screens. The current practice in the industry is to segment the high refresh rate and compensate for the leakage of different segments. This method is also very effective, but as the application scenarios of gaming screens become more and more diverse, in order to adapt to different environments, ambient light sensing elements are used to detect the intensity of ambient light to control the brightness of the display. In Freesync mode, compensating the brightness of the picture may achieve a good effect. If the brightness of the environment is relatively large, the display will also increase the display brightness synchronously. Then, under the enhancement of the backlight brightness, the previous compensation algorithm may not be applicable, and the screen will continue to flicker when switching frequencies. Summary of the invention

[0004] The purpose of the present application is to provide a display device and a driving method that can improve the flickering problem that occurs when the anti-tearing mode is enabled under different brightness environments.

[0005] The present application discloses a display device, which includes a display panel, a backlight module and a driving module. The driving module includes a timing controller, a gamma chip and a microprogram controller. The backlight module includes a backlight driving chip and a backlight source. A light sensing module is provided on the display panel. The light sensing module is used to detect the brightness of ambient light. The light sensing module is connected to an input end of the microprogram controller. One output end of the microprogram controller is connected to the timing controller, and the other output end is connected to the backlight driving chip. The timing controller is connected to the gamma chip. The microprogram controller generates a backlight brightness control signal according to the brightness of the ambient light detected by the light sensing module and outputs it to the backlight driving chip to control the brightness of the backlight source. The timing controller obtains a gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller and inputs it to the gamma chip to control the brightness of the display panel.

[0006] Optionally, the photosensitive module includes four photosensitive devices, all of which are thin-film transistor devices, and the four photosensitive devices are respectively a first photosensitive device, a second photosensitive device, a third photosensitive device and a fourth photosensitive device, the second photosensitive device and the third photosensitive device are arranged on the sky side of the display panel, the first photosensitive device and the four photosensitive devices are arranged on the left and right sides of the display panel respectively, and the distance from the first photosensitive device to the second photosensitive device is less than the distance from the first photosensitive device to the third photosensitive device or the fourth photosensitive device; the gate lines of the first photosensitive device and the second photosensitive device are connected together, and the first photosensitive device and The drain lines of the second photosensitive device are connected together, the gate lines of the third photosensitive device and the fourth photosensitive device are connected together, the drain lines of the third photosensitive device and the fourth photosensitive device are connected together, and the source lines of the first photosensitive device, the second photosensitive device, the third photosensitive device and the fourth photosensitive device are connected to the microprogram controller respectively; wherein, the degree of conduction of the four photosensitive devices is controlled by the brightness of the ambient light, and the voltage on the source line is controlled, and the microprogram controller generates a backlight brightness control signal according to the voltage on the source line of the first photosensitive device, the second photosensitive device, the third photosensitive device and the fourth photosensitive device, and outputs it to the backlight driver chip.

[0007] Optionally, the driving module includes a source voltage control circuit, which includes at least a first transistor and a second transistor, the control end of the first transistor and the control end of the second transistor are respectively connected to the source lines of the first photosensitive device, the second photosensitive device, the third photosensitive device and the fourth photosensitive device, the output end of the first transistor and the output end of the second transistor are respectively connected to a microprogram controller, the input end of the first transistor is connected to a power drive board through a first resistor, and the input end of the second transistor is connected to the power drive board through a second resistor. When the first transistor and the second transistor are turned on, the microprogram controller receives the voltage output by the power drive board and records the number of times, and generates a corresponding backlight brightness control signal according to the recorded number of times.

[0008] Optionally, the first photosensitive device and the fourth photosensitive device are arranged at two-fifths to one-half of the display panel in the direction from the ground side to the sky side, the light sensitivity of the first photosensitive device and the fourth photosensitive device is lower than that of the second photosensitive device and the third photosensitive device, and the liquid crystal box thickness located at two-fifths to one-half of the display panel in the direction from the ground side to the sky side is greater than the liquid crystal box thickness of other areas in the direction from the ground side to the sky side of the display panel.

[0009] Optionally, the timing controller includes a frequency detection module and an algorithm module, the frequency detection module is connected to the algorithm module, the algorithm module is connected to the gamma chip, the frequency detection module detects the frequency of the current frame and the next frame, when the frequency difference between the current frame and the next frame is greater than a preset value, the algorithm module generates a gamma voltage compensation value in real time according to the frequency difference and the backlight brightness control signal.

[0010] The present application also discloses a driving method, which is used to drive any of the above display devices, and the driving method includes:

[0011] Detect the brightness of ambient light;

[0012] Generate a backlight brightness control signal according to the brightness of the ambient light, and output it to the backlight driver chip to control the brightness of the backlight source;

[0013] A gamma voltage compensation value is obtained according to the backlight brightness control signal and input into the gamma chip to control the brightness of the display panel.

[0014] Optionally, the step of acquiring a gamma voltage compensation value according to a backlight brightness control signal and inputting the gamma voltage compensation value into the gamma chip to control the brightness of the display panel includes:

[0015] Detect the frequency of the next frame to determine whether to enter the anti-tearing mode. If not, control the timing controller to input a default gamma voltage value to the gamma chip. If the anti-tearing mode is entered, obtain the gamma voltage compensation value according to the backlight brightness control signal and input it to the gamma chip to control the brightness of the display panel.

[0016] If the absolute value of the frequency difference between the current frame and the next frame is greater than or equal to 30 Hz, it is determined that the anti-tearing mode is entered.

[0017] Optionally, in the anti-tearing mode, the backlight brightness is divided into at least three partitions, a gamma voltage compensation value is obtained by debugging each partition, and the step of obtaining the gamma voltage compensation value according to the backlight brightness control signal and inputting it into the gamma chip to control the brightness of the display panel includes:

[0018] The backlight brightness corresponding to the backlight brightness control signal is obtained, the partition where the backlight brightness is located is determined, a gamma voltage compensation value is obtained by looking up a table, and the value is input into the gamma chip to control the brightness of the display panel.

[0019] Optionally, the step of detecting the frequency of the next frame, determining whether to enter the anti-tearing mode, and if not entering the anti-tearing mode, controlling the timing controller to input a default gamma voltage value to the gamma chip, and if entering the anti-tearing mode, obtaining a gamma voltage compensation value according to a backlight brightness control signal, and inputting the gamma voltage compensation value to the gamma chip to control the brightness of the display panel includes:

[0020] If the anti-tearing mode is not entered, the backlight brightness remains unchanged, the algorithm module calculates the leakage size of each row of pixels, and generates a gamma voltage value according to the leakage size, and the timing controller sets the gamma voltage value generated by the algorithm module as a default gamma voltage;

[0021] If the anti-tearing mode is entered, a gamma voltage compensation value is obtained according to the backlight brightness control signal and input into the gamma chip to control the brightness of the display panel.

[0022] Optionally, the step of generating a backlight brightness control signal according to the brightness of the ambient light and outputting the signal to the backlight driver chip to control the brightness of the backlight source includes the following steps:

[0023] The brightness of the ambient light is detected in real time. When the brightness value is greater than the preset brightness value, it is recorded as High. When the brightness value is less than the preset brightness value, it is recorded as Low. If the number of High occurrences is greater than or equal to 60, a backlight brightness control signal is generated and output to the backlight driver chip to control the brightness of the backlight source.

[0024] Compared with the solution of directly adjusting the backlight brightness, the present application sets a light sensing detection module to detect the brightness of ambient light, uses the microprogram controller to obtain the brightness of the ambient light detected by the light sensing module, and generates a backlight brightness control signal according to the brightness of the ambient light and outputs it to the backlight driver chip to control the brightness of the backlight source. The timing controller obtains the gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller, and inputs it to the gamma chip to control the brightness of the display panel. The two compensations of the brightness of the display panel and the backlight brightness realize the linkage function, which effectively solves the problem of flickering in Freesync mode under different environments, and also improves the adaptability of the high-refresh gaming screen to the environment and the picture taste. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;

[0027] Figure 2 is a schematic structural diagram of a display device according to a second embodiment of the present application;

[0028] Figure 3 is a schematic structural diagram of a photosensitive device according to a second embodiment of the present application;

[0029] Figure 4 is a schematic diagram of a partial circuit structure of a display device according to a second embodiment of the present application;

[0030] Figure 5 is a schematic structural diagram of a display device according to a third embodiment of the present application;

[0031] Figure 6 is a schematic flow chart of a driving method according to a fourth embodiment of the present application;

[0032] Figure 7 is a schematic flow chart of a driving method according to a fifth embodiment of the present application;

[0033] Figure 8 It is a flowchart of the driving method of the sixth embodiment of the present application.

[0034] Among them, 100, display device; 200, display panel; 210, photosensitive module; 220, photosensitive device; 221, first photosensitive device; 222, second photosensitive device; 223, third photosensitive device; 224, fourth photosensitive device; 300, driving module; 310, timing controller; 311, frequency detection module; 312, algorithm module; 320, gamma chip; 330, microprogram controller; 340, source voltage control circuit; 341, first transistor; 342, second transistor; 350, power driver board; 360, printed circuit board; 400, backlight module; 410, backlight driver chip; 420, backlight source; R1-first resistor; R2-second resistor. DETAILED DESCRIPTION

[0035] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0036] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0037] refer to Figure 1 As shown, as the first embodiment of the present application, a display device 100 is disclosed, wherein the display device 100 includes a display panel 200, a backlight module 400 and a driving module 300, wherein the driving module 300 includes a timing controller 310 (Timing Controller, TCON), a gamma chip 320 (gamma IC) and a microcontroller 330 (Microcontroller Unit, MCU), the backlight module 400 includes a backlight driver chip 410 and a backlight source 420, the display panel 200 is provided with a light sensing module 210, the light sensing module 210 is used to detect the brightness of the ambient light, the light sensing module 210 is connected to the input end of the microprogram controller 330, one output end of the microprogram controller 330 is connected to the timing controller 310, and the other output end is connected to the backlight driver chip 410, and the timing controller 310 is connected to the gamma chip 320; wherein, the microprogram controller 330 generates a backlight brightness control signal according to the brightness of the ambient light detected by the light sensing module 210, outputs it to the backlight driver chip 410, so as to control the brightness of the backlight source 420, and the timing controller 310 obtains a gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller 330, and inputs it to the gamma chip 320 to control the brightness of the display panel 200.

[0038] In this embodiment, a light sensing module 210 for detecting the brightness of ambient light is provided on the display panel 200, and real-time feedback is given to the microprogram controller 330. The microprogram controller 330 generates a backlight brightness control signal according to the brightness of the ambient light detected by the light sensing module 210, and outputs the signal to the backlight driver chip 410 to control the brightness of the backlight source 420. The timing controller 310 obtains a gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller 330, and inputs the value to the gamma chip 320 to control the brightness of the display panel 200. The timing controller 310 is linked with the microprogram controller 330 to simultaneously control the display brightness and the brightness compensation of the mini LED backlight brightness, thereby avoiding the situation where the display brightness is increased synchronously due to the large ambient brightness. Then, with the enhancement of the backlight brightness, the brightness compensation algorithm of the display panel 200 is not applicable, and the screen flickering problem continues to occur when the frequency is switched.

[0039] like Figure 2 As shown, as the second embodiment of the present application, it is a further refinement and improvement of the above-mentioned first embodiment, referring to Figures 2 to 4 As shown, the photosensitive module 210 includes four photosensitive devices 220, and the four photosensitive devices 220 are all thin film transistor devices. The four photosensitive devices 220 are respectively a first photosensitive device 221, a second photosensitive device 222, a third photosensitive device 223 and a fourth photosensitive device 224. The second photosensitive device 222 and the third photosensitive device 223 are arranged on the sky side of the display panel 200, which generally refers to the upper side of the display panel 200 when it is placed vertically and displayed normally. The first photosensitive device 221 and the four photosensitive devices 220 are respectively arranged on the left and right sides of the display panel 200, and the distance from the first photosensitive device 221 to the second photosensitive device 222 is less than the first photosensitive device 221. The distance between the first photosensitive device 221 and the second photosensitive device 222 is relatively small, but both can monitor the brightness in the corresponding area and are not easy to block the display area; in addition, the positions of the four photosensitive devices 220 are generally symmetrical to each other, and are all set at the edge positions, maintaining a certain distance to ensure that they can sufficiently detect the ambient light received by the display area of ​​the display panel 200. The specific position setting can be adapted and adjusted according to the type of display device 100; of course, no adjustment is required, and compensation can be made through an algorithm to compensate for the ambient light detected at different positions according to the actual use environment.

[0040] In addition, in order to reduce the number of wirings, the gate lines of the first photosensitive device 221 and the second photosensitive device 222 are connected together and are both arranged on the first metal layer, the drain lines of the first photosensitive device 221 and the second photosensitive device 222 are connected together, the gate lines of the third photosensitive device 223 and the fourth photosensitive device 224 are connected together, the drain lines of the third photosensitive device 223 and the fourth photosensitive device 224 are connected together, and the first photosensitive device 221, the second photosensitive device 222, the third photosensitive device 223 and the fourth photosensitive device 224 are connected together. The source lines of the four photosensitive devices 224 are respectively connected to the microprogram controller 330; wherein, the degree of conduction of the four photosensitive devices 220 is controlled by the brightness of the ambient light, and the voltage on the source line is controlled. The microprogram controller 330 generates a backlight brightness control signal according to the voltage on the source line of the first photosensitive device 221, the second photosensitive device 222, the third photosensitive device 223 and the fourth photosensitive device 224, and outputs it to the backlight driver chip 410. The backlight driver chip 410 generates a corresponding PWM signal to control the display brightness of the backlight source 420.

[0041] Generally, the driving module 300 includes a printed circuit board 360 (PCBA), on which a source voltage control circuit 340 is arranged, and the source voltage control circuit 340 includes at least a first transistor 341 and a second transistor 342, wherein a control end of the first transistor 341 and a control end of the second transistor 342 are respectively connected to source lines of the first photosensitive device 221, the second photosensitive device 222, the third photosensitive device 223 and the fourth photosensitive device 224, and an output end of the first transistor 341 and an output end of the second transistor 342 are respectively connected to a microprogram controller 330, and the first transistor 341 and the second transistor 342 are respectively connected to source lines of the first photosensitive device 221, the second photosensitive device 222, the third photosensitive device 223 and the fourth photosensitive device 224. The input end of the second transistor 342 is connected to the power driving board 350 through the first resistor R1, and the input end of the second transistor 341 is connected to the power driving board 350 through the second resistor R2. When the first transistor 341 and the second transistor 342 are turned on, the microprogram controller 330 receives the voltage output by the power driving board 350 and records the number of times, and generates a corresponding backlight brightness control signal according to the recorded number of times; there is no need to use too much complicated circuit design, only the signal input and output of the four-way photosensitive device 220 needs to be added to the original driving circuit design, and the compensation code corresponding to the timing controller 310 and the microprogram control can be adjusted to achieve it.

[0042] Taking the two source lines S1 and S2 of the first photosensitive device 221 and the second photosensitive device 222 as an example, the two lines S1 and S2 are connected to the two MOS tubes of PCBA, namely the G level (gate level) of the first transistor 341 and the second transistor 342. The source level of the first transistor 341 and the second transistor 342 are first given a 3V voltage. If the gate is also given a 3V voltage, it is in a conducting state. The other end of the first transistor 341 and the second transistor 342 is connected to the input end GPIO of the microprogram controller 330. The input end of the microprogram controller 330 will record a voltage reaching 3V as a High state, and a voltage lower than 3V as a Low state. After the power is turned on, the MCU will automatically detect the High and Low conditions of the defined input terminal of the microprogram controller 330. Generally, if the microprogram controller 330 records the High state 60 times within 1 second, it is considered that the brightness of the environment has reached a very high state, and the brightness of the backlight source 420 needs to be adjusted. The microprogram controller 330 will call the previously adjusted compensation value code and write it into the LED PWM chip, so that the brightness of the backlight source 420 can be adjusted. If there are four light sensors 220, the S1, S2, S3, and S4 source lines corresponding to the four light sensors 220 are all connected to the GPIO of the microprogram controller 330. On the pin, as long as one GPIO has a High state 60 times within 1s, the backlight brightness needs to be adjusted to adapt to the quality loss caused by the high ambient light brightness; different times can also be set according to different specifications, for example, 55 times within 1s, or 65 times within 1s. Within this range, occasional false detection can be avoided (for example, if H appears several times, the system will adjust the brightness, which will cause flickering of brightness difference) and the reliability of dynamic adjustment can be improved.

[0043] When setting the position of the photosensitive device 220, the first photosensitive device 221 and the fourth photosensitive device 224 are usually set at two-fifths to one-half of the direction from the ground side to the sky side of the display panel 200, and are symmetrical to each other. The light sensitivity of the first photosensitive device 221 and the fourth photosensitive device 224 is lower than that of the second photosensitive device 222 and the third photosensitive device 223. In the direction from the ground side to the sky side of the display panel 200, the liquid crystal box thickness located in the two-fifths to one-half of the direction from the ground side to the sky side of the display panel 200 is greater than the liquid crystal box thickness of other areas in the direction from the ground side to the sky side of the display panel 200.

[0044] This embodiment takes into account that when the display panel 200 is used for a long time, the liquid crystal will fall due to the influence of gravity, thereby causing the liquid crystal to be deposited below the display panel 200, thereby increasing the cell thickness. The accumulation of liquid crystal will affect the transmittance of light, resulting in a decrease in brightness, that is, the actual brightness value of light is lower than the ideal value. If the display effect is to be guaranteed, the brightness of the backlight source 420 needs to be increased. Assuming that the brightness of 10 grayscales has a corresponding brightness compensation value of 1 under normal circumstances, but because the accumulation of liquid crystals causes an increase in cell thickness, the brightness compensation value required for the brightness of 10 grayscales is 1.2. If 1 is continued to be used as the compensation value, the actual displayed grayscale cannot reach 10 grayscales. Therefore, the light sensitivity of the first photosensitive device 221 and the fourth photosensitive device 224 located below is lower than that of the second photosensitive device 222 and the third photosensitive device 223, so that on the basis of the original compensation, the compensation value is further increased to ensure that the final display brightness meets the display requirements.

[0045] like Figure 5 As shown, as the third embodiment of the present application, it is a further refinement and improvement of any of the above embodiments. The timing controller 310 includes a frequency detection module 311 and an algorithm module 312. The frequency detection module 311 is connected to the algorithm module 312. The algorithm module 312 is connected to the gamma chip 320. The frequency detection module 311 detects the frequencies of the current frame and the next frame. When the frequency difference between the current frame and the next frame is greater than a preset value, the algorithm module 312 generates a gamma voltage compensation value in real time according to the frequency difference and the backlight brightness control signal.

[0046] In this embodiment, the frequency of the display panel 200 is detected. Under normal circumstances, the frequency of the previous and next frames is within a certain range of variation, the brightness change is not obvious, and the human eye will not see the difference, that is, the display is normal. Then the corresponding program controller and the related timing controller 310 output according to the default data, and the brightness of the corresponding display panel 200 and the backlight brightness do not need to be compensated; when entering from a low frequency to a high frequency, the frequency switches quickly, a line time changes, and the A-SI leakage causes the screen to flicker. When the real-time call of the gamma voltage compensation value encoding is no longer applicable through voltage compensation for the corresponding frequency segment with relatively large leakage, the timing controller 310 will detect the situation of the microprogram controller 330 to the LED PWM chip, confirm that the backlight brightness falls in that interval, and write the gamma voltage compensation value encoding value in the corresponding area into the gamma driver chip, so as to ensure that when the backlight brightness changes, a better gamma voltage compensation value can also be achieved.

[0047] like Figure 6As shown, as a fourth embodiment of the present application, a driving method is disclosed, the driving method is used to drive the display device as described in any of the above embodiments, the driving method comprising:

[0048] S1: detects the brightness of ambient light;

[0049] S2: Generate a backlight brightness control signal according to the brightness of the ambient light, and output it to the backlight driver chip to control the brightness of the backlight source;

[0050] S3: Obtaining a gamma voltage compensation value according to a backlight brightness control signal, and inputting the value into the gamma chip to control the brightness of the display panel.

[0051] In this embodiment, the light sensing module of the display panel is used to detect the brightness of the ambient light. The microprogram controller generates a backlight brightness control signal according to the brightness of the ambient light detected by the light sensing module and outputs it to the backlight driver chip to control the brightness of the backlight source. The timing controller obtains a gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller and inputs it to the gamma chip to control the brightness of the display panel. The TCON is connected to the MCU to adjust the OC brightness and the backlight brightness respectively, so as to improve the picture display quality while avoiding flickering in the Freesync mode.

[0052] like Figure 7 As shown, as the fifth embodiment of the present application, it is a further refinement and improvement of the fourth embodiment, and the step S2 includes the following steps:

[0053] S21: Real-time detection of the brightness of the ambient light. When the brightness value is greater than the preset brightness value, it is recorded as High. When the brightness value is less than the preset brightness value, it is recorded as Low. If the number of High occurrences is greater than or equal to 60, a backlight brightness control signal is generated and output to the backlight driver chip to control the brightness of the backlight source.

[0054] The microprogram controller will automatically detect the High and Low conditions of the defined input terminal of the microprogram controller; generally, if the microprogram controller records the High state 60 times within 1s, it is considered that the brightness of the environment has reached a very high state, and a backlight brightness control signal is generated and output to the backlight driver chip to control the brightness of the backlight source. The microprogram controller will call the previously adjusted compensation value code and write it into the LED PWM chip to adjust the brightness of the backlight source.

[0055] The step S3 comprises:

[0056] S31: Detect the frequency of the next frame and determine whether to enter the anti-tearing mode. If not, control the timing controller to input a default gamma voltage value to the gamma chip; if the anti-tearing mode is entered, obtain a gamma voltage compensation value according to the backlight brightness control signal and input it to the gamma chip to control the brightness of the display panel;

[0057] Among them, if the absolute value of the frequency difference between the current frame and the next frame is greater than or equal to 30Hz, it is judged to enter the anti-tearing mode and Freesync mode to achieve linkage adjustment of the backlight brightness and the display panel brightness.

[0058] Furthermore, in the anti-tearing mode, the backlight brightness is divided into at least three partitions, and a gamma voltage compensation value is obtained by debugging each partition. The backlight brightness corresponding to the backlight brightness control signal is obtained to determine the partition where the backlight brightness is located. The gamma voltage compensation value is obtained by looking up the table and input into the gamma chip to control the brightness of the display panel.

[0059] Usually, four brightness nodes (unit: nit) are set, and the four brightness nodes A, B, C, and D form three brightness partitions (A, B), (B, C), and (C, D). In these three brightness intervals, in the (A, B) brightness interval, for example: select the backlight brightness of (A+B) / 2, enter the Freesync mode, debug the code (GM code) corresponding to the gamma compensation value, select the best GMcode, recorded as code1, and similarly generate code2 and code3 in the other two brightness intervals in the same way, and write the three codes to the TCON flash memory for storage.

[0060] TCON will receive the data signal from the graphics card, and will first determine whether to enter the Freesync mode. If not, the default code value will be called normally and written to the gamma chip to maintain the GM value under the current default refresh rate. If TCON detects that it has entered the Freesync mode, TCON will detect the situation of the MCU to the LED PWM chip to confirm which range the backlight brightness falls into. For example, if the brightness of the LED PWM controlled by the MCU falls in the (A, B) range, TCON will call code1 in the lookup table as the GM code value and write it to the GM IC. This ensures that when the backlight brightness changes, a better GM compensation value can be achieved.

[0061] like Figure 8 As shown, as the sixth embodiment of the present application, it is a further improvement on the fifth embodiment, and the step S31 includes:

[0062] S311: If the anti-tearing mode is not entered, the backlight brightness remains unchanged, the algorithm module calculates the leakage size of each row of pixels, and generates a gamma voltage value according to the leakage size, and the timing controller sets the gamma voltage value generated by the algorithm module as a default gamma voltage;

[0063] S312: If the anti-tearing mode is entered, a gamma voltage compensation value is obtained according to the backlight brightness control signal, and inputted into the gamma chip to control the brightness of the display panel.

[0064] If the anti-tearing mode is not entered, it can be seen that the frequency of the previous and next frames is within a certain range of variation, the brightness change is not obvious, and the human eye will not see the difference, that is, it is displayed normally. Then the corresponding program controller and the related timing controller output according to the default data, and the brightness of the corresponding display panel and the backlight brightness do not need to be compensated; when entering the high frequency from the low frequency, the frequency switches quickly, the time of a line changes, the A-SI leakage causes the screen to flicker, and the gamma voltage compensation value encoding is called in real time according to the leakage size. When the voltage compensation for the corresponding frequency segment with relatively large leakage is no longer applicable, the timing controller will detect the situation of the microprogram controller MCU to the LED PWM chip, confirm which interval the backlight brightness falls in, and write the gamma voltage compensation value encoding value in the corresponding area into the gamma driver chip, thus ensuring that when the backlight brightness changes, a better gamma voltage compensation value can be achieved.

[0065] It should be noted that the limitations of the various steps involved in this scheme, without affecting the implementation of the specific scheme, are not considered to limit the order of the steps, that is, the steps written in front can be executed first, or can be executed later, or even simultaneously. As long as this scheme can be implemented, it should be considered to belong to the scope of protection of this application. The inventive concept of this application can form a lot of embodiments, but the length of the application document is limited and cannot be listed one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form a new embodiment. After the various embodiments or technical features are combined, the original technical effect will be enhanced.

[0066] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A display device, comprising a display panel, a backlight module and a driving module, wherein the driving module comprises a timing controller, a gamma chip and a microprogram controller, and the backlight module comprises a backlight driving chip and a backlight source, characterized in that: The display panel is provided with a light sensing module, which is used to detect the brightness of ambient light. The light sensing module is connected to the input end of the microprogram controller, one output end of the microprogram controller is connected to the timing controller, and the other output end is connected to the backlight driving chip, and the timing controller is connected to the gamma chip; Among them, the microprogram controller generates a backlight brightness control signal according to the brightness of the ambient light detected by the light sensing module and outputs it to the backlight driver chip to control the brightness of the backlight source. The timing controller obtains a gamma voltage compensation value according to the backlight brightness control signal generated by the microprogram controller and inputs it into the gamma chip to control the brightness of the display panel.

2. The display device according to claim 1, wherein: The photosensitive module includes four photosensitive devices, all of which are thin film transistor devices, and the four photosensitive devices are respectively a first photosensitive device, a second photosensitive device, a third photosensitive device and a fourth photosensitive device, the second photosensitive device and the third photosensitive device are arranged on the sky side of the display panel, the first photosensitive device and the four photosensitive devices are arranged on the left and right sides of the display panel respectively, and the distance from the first photosensitive device to the second photosensitive device is less than the distance from the first photosensitive device to the third photosensitive device or the fourth photosensitive device; The gate lines of the first photosensitive device and the second photosensitive device are connected together, the drain lines of the first photosensitive device and the second photosensitive device are connected together, the gate lines of the third photosensitive device and the fourth photosensitive device are connected together, the drain lines of the third photosensitive device and the fourth photosensitive device are connected together, and the source lines of the first photosensitive device, the second photosensitive device, the third photosensitive device and the fourth photosensitive device are connected to the microprogram controller respectively; Among them, the conduction degree of the four photosensitive devices is controlled by the brightness of the ambient light, and the voltage on the source line is controlled. The microprogram controller generates a backlight brightness control signal based on the voltage on the source line of the first photosensitive device, the second photosensitive device, the third photosensitive device and the fourth photosensitive device, and outputs it to the backlight driver chip.

3. The display device according to claim 2, wherein: The driving module includes a source voltage control circuit, which includes at least a first transistor and a second transistor. The control end of the first transistor and the control end of the second transistor are respectively connected to the source lines of the first photosensitive device, the second photosensitive device, the third photosensitive device and the fourth photosensitive device. The output end of the first transistor and the output end of the second transistor are respectively connected to a microprogram controller. The input end of the first transistor is connected to a power drive board through a first resistor, and the input end of the second transistor is connected to the power drive board through a second resistor. When the first transistor and the second transistor are turned on, the microprogram controller receives the voltage output by the power drive board and records the number of times, and generates a corresponding backlight brightness control signal according to the recorded number of times.

4. The display device according to claim 2, wherein: The first photosensitive device and the fourth photosensitive device are arranged at two-fifths to one-half of the display panel in the direction from the ground side to the sky side, the light sensitivity of the first photosensitive device and the fourth photosensitive device is lower than that of the second photosensitive device and the third photosensitive device, and the liquid crystal box thickness located at two-fifths to one-half of the display panel in the direction from the ground side to the sky side is greater than the liquid crystal box thickness of other areas in the direction from the ground side to the sky side of the display panel.

5. The display device according to claim 2, wherein: The timing controller includes a frequency detection module and an algorithm module, the frequency detection module is connected to the algorithm module, the algorithm module is connected to the gamma chip, the frequency detection module detects the frequency of the current frame and the next frame, when the frequency difference between the current frame and the next frame is greater than a preset value, the algorithm module generates a gamma voltage compensation value in real time according to the frequency difference and the backlight brightness control signal.

6. A driving method, characterized in that: Used to drive the display device according to any one of claims 1 to 5, the driving method comprising: Detect the brightness of ambient light; Generate a backlight brightness control signal according to the brightness of the ambient light, and output it to the backlight driver chip to control the brightness of the backlight source; A gamma voltage compensation value is obtained according to the backlight brightness control signal and input into the gamma chip to control the brightness of the display panel.

7. The driving method according to claim 6, characterized in that: The step of obtaining a gamma voltage compensation value according to a backlight brightness control signal and inputting the value into the gamma chip to control the brightness of the display panel comprises: Detect the frequency of the next frame to determine whether to enter the anti-tearing mode. If not, control the timing controller to input a default gamma voltage value to the gamma chip. If the anti-tearing mode is entered, obtain the gamma voltage compensation value according to the backlight brightness control signal and input it to the gamma chip to control the brightness of the display panel. If the absolute value of the frequency difference between the current frame and the next frame is greater than or equal to 30 Hz, it is determined that the anti-tearing mode is entered.

8. The driving method according to claim 7, characterized in that: In the anti-tearing mode, the backlight brightness is divided into at least three partitions, and a gamma voltage compensation value is obtained by debugging each partition. The step of obtaining the gamma voltage compensation value according to the backlight brightness control signal and inputting it into the gamma chip to control the brightness of the display panel includes: The backlight brightness corresponding to the backlight brightness control signal is obtained, the partition where the backlight brightness is located is determined, a gamma voltage compensation value is obtained by looking up a table, and the value is input into the gamma chip to control the brightness of the display panel.

9. The driving method according to claim 7, characterized in that: The step of detecting the frequency of the next frame, determining whether to enter the anti-tearing mode, and if not entering the anti-tearing mode, controlling the timing controller to input a default gamma voltage value to the gamma chip, and if entering the anti-tearing mode, obtaining a gamma voltage compensation value according to a backlight brightness control signal, and inputting the gamma voltage compensation value to the gamma chip to control the brightness of the display panel includes: If the anti-tearing mode is not entered, the backlight brightness remains unchanged, the algorithm module calculates the leakage size of each row of pixels, and generates a gamma voltage value according to the leakage size, and the timing controller sets the gamma voltage value generated by the algorithm module as a default gamma voltage; If the anti-tearing mode is entered, a gamma voltage compensation value is obtained according to the backlight brightness control signal and input into the gamma chip to control the brightness of the display panel.

10. The driving method according to claim 6, characterized in that: The step of generating a backlight brightness control signal according to the brightness of the ambient light and outputting the signal to the backlight driving chip to control the brightness of the backlight source comprises the following steps: The brightness of the ambient light is detected in real time. When the brightness value is greater than the preset brightness value, it is recorded as High. When the brightness value is less than the preset brightness value, it is recorded as Low. If the number of High occurrences is greater than or equal to 60, a backlight brightness control signal is generated and output to the backlight driver chip to control the brightness of the backlight source.

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