Backlight driving method, backlight driving system and display device

Abstract

The present invention discloses a backlight driving method, a backlight driving system and a display device. The backlight driving method includes the steps of: acquiring in real time the backlight brightness data of the displayed image on the display screen; obtaining the light emitting parameters of each LED light source on the display screen according to the backlight brightness data; generating a backlight control signal according to the light emitting parameters; generating brightness control data according to the light emitting parameters; obtaining brightness compensation control data according to the brightness control data and the display screen size; and adjusting the brightness of the area to be compensated and displayed on the display screen according to the backlight control signal and the brightness compensation control data. By acquiring and processing the backlight brightness data in real time, the present application respectively obtains a backlight control signal and brightness control data, calculates the brightness control data and the display screen size to obtain brightness compensation control data, so as to adjust the brightness of the area to be compensated on the display screen, thereby making the overall brightness of the display screen uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of television sets, and in particular to a backlight driving method, a backlight driving system and a display device. Background Art

[0002] Backlight edge compensation, that is, brightness uniformity compensation. In a conventional display screen, the backlight brightness is the brightest at the center under a white field, and the brightness becomes darker towards the four edges. Therefore, the backlight brightness uniformity of a conventional display screen is very poor. When the backlight brightness data is consistent with the brightness data of the main board display screen image, the maximum current of all backlight lamp beads on the display screen is the same. Currently, all backlight driving schemes only perform adaptation with equal current peaks in each LED channel, that is, the maximum current of the lamp beads at each position of the television set is the same. The existing scheme is to adjust the configuration parameters of the backlight driving chip by the micro control unit to achieve the matching of the peak current of the lamp beads at the edge position of the television set. Although this scheme can achieve local dimming matching for different duty cycles, when the effective current values of each LED channel are equal under the same duty cycle, it will cause the overall brightness of the display screen to be bright at the center and dim at the periphery, thereby affecting the display effect of the picture. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: to provide a backlight driving method, a backlight driving system and a display device to solve the problem of uneven display of the existing display screen.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is:

[0005] A backlight driving method includes the steps of:

[0006] Obtaining the backlight brightness data of the displayed image on the display screen in real time;

[0007] Obtaining the light emitting parameters of each LED light source on the display screen according to the backlight brightness data;

[0008] Generating a backlight control signal according to the light emitting parameters;

[0009] Generating brightness control data according to the light emitting parameters;

[0010] Obtaining brightness compensation control data according to the brightness control data and the display screen size;

[0011] Adjusting the brightness of the display area to be compensated on the display screen according to the backlight control signal and the brightness compensation control data.

[0012] Further, the step of generating brightness control data according to the light emitting parameters includes:

[0013] Dividing the display screen into several display areas;

[0014] Obtain the light-emitting parameters of the LED light sources in each display area;

[0015] Generate the brightness control data according to the light-emitting parameters;

[0016] Wherein, the light-emitting parameters include the current amplitude of the LED light sources.

[0017] Furthermore, the brightness compensation control data includes the display area to be compensated and the corresponding compensation value.

[0018] Furthermore, the step of obtaining the brightness compensation control data according to the brightness control data and the display screen size includes:

[0019] Obtain the display area to be compensated according to the display screen size;

[0020] Obtain the compensation value of the display area to be compensated;

[0021] Generate the brightness compensation control data according to the display area to be compensated and the corresponding compensation value.

[0022] Furthermore, the step of adjusting the brightness of the display area to be compensated on the display screen according to the backlight control signal and the brightness compensation control data includes:

[0023] Adjust the current amplitude of the corresponding LED light source according to the backlight control signal and the compensation value of the display area to be compensated to increase the brightness of the corresponding LED light source.

[0024] A backlight driving system, comprising: a main control module, an LED driving module and a display screen;

[0025] The main control module is connected to the LED driving module. The main control module is used to obtain the backlight brightness data in real time, and obtain the backlight control signal and the brightness control data according to the backlight brightness data and output them to the LED driving module;

[0026] The LED driving module is connected to the display screen. The LED driving module is used to obtain the brightness compensation control data according to the brightness control data and the display screen size, and adjust the brightness of the display area to be compensated on the display screen according to the brightness compensation control data and the backlight control signal.

[0027] Furthermore, the main control module includes a main control unit. The main control unit is connected to the LED driving module. The main control unit is used to obtain the backlight control signal and the brightness control data according to the backlight brightness data and output them to the LED driving module.

[0028] Further, the LED driving module includes a micro-control unit and an LED driving unit;

[0029] The micro-control unit is respectively connected to the main control unit and the LED driving unit. The micro-control unit is configured to obtain the brightness compensation control data according to the brightness control data and the display screen size, and output the brightness compensation control data and the backlight control signal to the LED driving unit;

[0030] The LED driving unit is connected to the display screen. The LED driving unit is configured to adjust the brightness of the display area to be compensated according to the brightness compensation control data and the backlight control signal.

[0031] Further, the display screen includes a plurality of display units. The plurality of display units are configured to divide the display screen into a plurality of display areas. Each display unit includes an LED light source. The brightness compensation control data includes the display area to be compensated and the compensation value of the display area to be compensated. The LED driving unit is configured to adjust the current amplitude of the corresponding LED light source according to the backlight control signal, the display area to be compensated, and the compensation value of the display area to be compensated, so as to adjust the brightness of the corresponding LED light source.

[0032] A display device includes the backlight driving system as described in any one of the above.

[0033] The beneficial effects of the present invention are as follows: By obtaining and processing the backlight brightness data in real time, and respectively obtaining the backlight control signal and the brightness control data according to the light-emitting parameters in the backlight brightness data, calculating the brightness compensation control data by combining the brightness control data and the display screen size, so as to adjust the brightness of the display area to be compensated on the display screen, thereby making the overall brightness of the display screen uniform. Description of the Drawings

[0034] Figure 1 It is the first block diagram of the flow of the backlight driving method according to the embodiment of the present invention;

[0035] Figure 2 It is the second block diagram of the flow of the backlight driving method according to the embodiment of the present invention;

[0036] Figure 3 It is the third block diagram of the flow of the backlight driving method according to the embodiment of the present invention;

[0037] Figure 4 It is the schematic diagram of the backlight driving system according to the embodiment of the present invention;

[0038] Figure 5 It is the current amplitude diagram of each display unit of the display screen according to the embodiment of the present invention;

[0039] Figure 6 Schematic diagram of a backlight driving system in the prior art;

[0040] Figure 7 Current amplitude diagram of each display unit of a display screen in the prior art.

[0041] Label description:

[0042] 100, main control module; 110, main control unit; 200, LED driving module; 210, micro control unit; 220, LED driving unit; 300, display screen; 310, display unit; 400, power supply module. Detailed implementation manners

[0043] To describe in detail the technical content, achieved object and effects of the present invention, the following is described in conjunction with the implementation manners and accompanied by the drawings.

[0044] Embodiment

[0045] Please refer to Figures 1 to 5 , an embodiment of the present invention is a backlight driving method applied to a display device supporting local dimming.

[0046] Please refer to Figure 1 , the backlight driving method includes the steps of:

[0047] S1. Obtain the backlight brightness data of the displayed image on the display screen in real time;

[0048] S2. Obtain the light emitting parameters of each LED light source on the display screen according to the backlight brightness data;

[0049] S3. Generate a backlight control signal according to the light emitting parameters;

[0050] S4. Generate brightness control data according to the light emitting parameters;

[0051] S5. Obtain brightness compensation control data according to the brightness control data and the display screen size;

[0052] S6. Adjust the brightness of the display area to be compensated on the display screen according to the backlight control signal and the brightness compensation control data.

[0053] The principle of the backlight driving method in this embodiment is as follows: The backlight brightness data of the displayed image on the display screen 300 is obtained in real time, and the light-emitting parameters of each LED light source on the display screen 300 are obtained from the backlight brightness data. According to the light-emitting parameters, a backlight control signal SPI and brightness control data DATA are generated. The brightness control data DATA and the size of the display screen 300 are calculated to obtain brightness compensation control data DATA_1. Then, according to the brightness compensation control data DATA_1 and the backlight control signal SPI, the brightness of the area to be compensated on the display screen 300 is adjusted.

[0054] It can be understood that in this embodiment, the brightness compensation control data DATA_1 is separated from the brightness control data DATA. The brightness control data DATA and the brightness compensation control data DATA_1 are synchronized. The brightness control data DATA is the brightness data for the screen refresh of the display screen 300, and the brightness compensation control data DATA_1 is the compensated brightness data obtained through calculation based on the backlight brightness data and the size of the display screen 300. The driving circuit for driving the display screen 300 performs brightness compensation on the darker areas at the edges of the display screen 300 according to the backlight control signal SPI and the brightness compensation control data DATA_1, so as to make the overall brightness of the display screen 300 uniform, which is beneficial to improving the imaging quality of the display.

[0055] Please refer to Figure 2 , the step of generating the brightness control data DATA according to the light-emitting parameters includes:

[0056] S41. Divide the display screen into several display areas;

[0057] In this step, by increasing the number of divisions of the display areas, the brightness compensation accuracy of the display screen 300 is improved, so that the display brightness is more uniform.

[0058] S42. Obtain the light-emitting parameters of the LED light sources in each display area;

[0059] S43. Generate the brightness control data according to the light-emitting parameters;

[0060] Among them, the light-emitting parameters include the current amplitude of the LED light source.

[0061] In this embodiment, the brightness compensation control data DATA_1 includes the display area to be compensated and the corresponding compensation value.

[0062] It can be understood that all the brightness data of the display areas can be obtained through the brightness compensation control data DATA_1, including the display area to be compensated and the corresponding required compensation value.

[0063] Please refer toFigure 3 and Figure 4 Specifically, the step of obtaining the brightness compensation control data DATA_1 according to the brightness control data DATA and the size of the display screen 300 includes:

[0064] S51. Obtain the display area to be compensated according to the size of the display screen;

[0065] S52. Obtain the compensation value of the display area to be compensated;

[0066] S53. Generate the brightness compensation control data according to the display area to be compensated and the corresponding compensation value.

[0067] Furthermore, the step of adjusting the brightness of the display area to be compensated on the display screen 300 according to the backlight control signal SPI and the brightness compensation control data DATA_1 includes:

[0068] Adjust the current amplitude of the corresponding LED light source according to the backlight control signal SPI and the compensation value of the display area to be compensated, so as to increase the brightness of the corresponding LED light source.

[0069] It can be understood that in the backlight driving method of this embodiment, the display screen 300 is divided into multiple display areas. The brightness compensation control data DATA_1 is obtained according to the size of the display screen 300 and the current amplitude of the LED light source, and records in real time the display area to be compensated on the display screen 300 and the corresponding compensation value, and realizes brightness compensation by adjusting the current amplitude of the LED light source in the display area to be compensated. The compensation value in this embodiment is the compensation value of the current amplitude. In other embodiments, the compensation value of the brightness can be preferentially obtained and then converted into the compensation value of the corresponding current amplitude through calculation.

[0070] Please refer to Figure 4 This embodiment also discloses a backlight driving system, including: a main control module 100, an LED driving module 200 and a display screen 300; the main control module 100 is connected to the LED driving module 200, and the main control module 100 is used to obtain backlight brightness data in real time, and obtain a backlight control signal SPI and brightness control data DATA according to the backlight brightness data and output them to the LED driving module 200; the LED driving module 200 is connected to the display screen 300, and the LED driving module 200 is used to obtain brightness compensation control data DATA_1 according to the brightness control data DATA and the size of the display screen 300, and adjust the brightness of the display area to be compensated on the display screen 300 according to the brightness compensation control data DATA_1 and the backlight control signal SPI.

[0071] The working principle of the backlight driving system in this embodiment is as follows: The main control module 100 acquires and processes backlight brightness data in real time. Specifically, it obtains the light-emitting parameters of each LED light source on the display screen 300 from the backlight brightness data, and obtains the backlight control signal SPI and the brightness control data DATA according to the light-emitting parameters, and sends the brightness control data DATA and the backlight control signal SPI to the LED driving module 200. The LED driving module 200 calculates the brightness compensation control data DATA_1 based on the brightness control data DATA and the size of the display screen 300, and adjusts the brightness of the display screen 300 according to the backlight control signal SPI and the brightness compensation control data DATA_1.

[0072] It can be understood that the backlight driving system obtains the backlight control signal SPI and the brightness control data DATA through the main control module 100 according to the backlight brightness data, and then calculates the brightness compensation control data DATA_1 by the LED driving module 200 based on the brightness control data DATA and the size of the display screen 300, so that the brightness control data DATA and the brightness compensation control data DATA_1 are separated. The LED driving module 200 adjusts the brightness of the display screen 300 according to the brightness compensation control data DATA_1 and the backlight control signal SPI. Therefore, the brightness of the darker display area is compensated, so that the display brightness of the display screen 300 remains uniform.

[0073] Specifically, the main control module 100 includes a main control unit 110, the main control unit 110 is connected to the LED driving module 200, and the main control unit 110 is used to obtain the backlight control signal SPI and the brightness control data DATA according to the backlight brightness data and output them to the LED driving module 200. The LED driving module 200 includes a micro-control unit 210 and an LED driving unit 220; the micro-control unit 210 is respectively connected to the main control unit 110 and the LED driving unit 220, and the micro-control unit 210 is used to obtain the brightness compensation control data DATA_1 according to the brightness control data DATA and the size of the display screen 300, and output the brightness compensation control data DATA_1 and the backlight control signal SPI to the LED driving unit 220; the LED driving unit 220 is connected to the display screen 300, and the LED driving unit 220 is used to adjust the brightness of the display area to be compensated according to the brightness compensation control data DATA_1 and the backlight control signal SPI.

[0074] It can be understood that after the main control unit 110 obtains the backlight brightness data, it obtains the light-emitting parameters from the backlight brightness data, and outputs the backlight control signal SPI and the brightness control data DATA according to the light-emitting parameters. The micro control unit 210 calculates the to-be-compensated display area with a darker edge of the display screen 300 and the corresponding compensation value based on the brightness control data DATA and the size of the display screen 300, and generates the brightness compensation control data DATA_1, and sends the brightness compensation control data DATA_1 and the backlight control signal SPI to the LED driving unit 220. The LED driving unit 220 adjusts the brightness of the area to be compensated on the display screen 300 according to the brightness compensation control data DATA_1 and the backlight control signal SPI, and performs brightness compensation on the area with a darker edge of the display screen 300, so as to keep the brightness of the display screen 300 uniform.

[0075] Please refer to Figure 6 , in the backlight driving system of the prior art, the micro control unit 210 directly sends the brightness control data DATA to the LED driving chip through simple shifting. The control signal sent by the main control unit 110 to the micro control unit 210 is the same as the control signal sent by the micro control unit 210 to the LED driving chip, and the brightness control data DATA in this signal will not be compensated. Please refer to Figure 7 , in the prior art, the current amplitude of all display units 310 of the display screen 300 is m, that is, the effective current values of each LED channel are equal under the same duty cycle. Therefore, the brightness of the edge of the display screen 300 is always lower than that of the inner side, and the backlight brightness uniformity of the display screen 300 is poor. Compared with the prior art, in this embodiment, the received brightness control data DATA is separated from the control signal and calculated with the size of the display screen 300 to obtain the brightness compensation control data DATA_1, which includes the display area to be compensated on the display screen 300 and the corresponding compensation value, and local brightness adjustment is performed on the display area to be compensated, which is beneficial to keeping the display brightness of the display screen 300 uniform.

[0076] In this embodiment, the display screen 300 includes a plurality of display units 310. The plurality of display units 310 are used to divide the display screen 300 into a plurality of display areas. Each display unit 310 includes an LED light source. The brightness compensation control data DATA_1 includes the compensation value of the display area that needs brightness compensation. The LED driving unit 220 adjusts the current amplitude of the corresponding LED light source according to the backlight control signal SPI and the compensation value of the display area that needs brightness compensation.

[0077] Among them, the LED driving unit 220 includes an LED driving chip. The micro-control unit 210 first performs initialization configuration on the LED driving chip. The micro-control unit 210 adjusts the register configuration of the LED driving chip according to the brightness conditions of different regions of the display screen 300. Specifically, the backlight control signal SPI and the brightness compensation control data DATA_1 are sent to the LED driving chip to complete the refresh of the backlight brightness of the display screen 300, realizing the adjustment of the backlight brightness of the display screen 300 within each frame data cycle, while ensuring that the backlight current has no sudden change, and realizing the smooth switching of the brightness of the display picture.

[0078] The display screen 300 is divided into multiple display regions. The brightness compensation control data DATA_1 is adjusted according to the size of the display screen 300 and the current amplitude of the LED light source, and records in real time the display regions that need to be compensated on the display screen 300 and the corresponding compensation values, and adjusts the current amplitude of the LED light source in the display regions that need brightness compensation through the LED driving chip, so as to achieve brightness compensation. Please refer to Figure 5 , for example, the current amplitude of the display unit 310 located inside the display screen 300 is n, and the current amplitude of the compensated display unit 310 located at the edge is "n + a" or "n + b". The brightness compensation control data DATA_1 will not have any impact on the smoothness of the current of the LED driving chip during the frequent adjustment process, and meets the frequent switching of the data of the main control unit 110. The backlight driving system of this embodiment is particularly applicable in scenarios where the brightness uniformity requirement of the display screen 300 is relatively high.

[0079] This embodiment also discloses a display device, including the backlight driving system as described in any one of the above. Among them, the display device further includes a power supply module 400, and the power supply module 400 is electrically connected to the display screen 300, the LED driving module 200, and the main control module 100, and is used to supply power to the display screen 300, the LED driving module 200, and the main control module 100.

[0080] In summary, the backlight driving method, backlight driving system, and display device provided by the present invention obtain the backlight control signal and the brightness control data respectively by acquiring and processing the backlight brightness data in real time, calculate the brightness compensation control data by combining the brightness control data and the display screen size, so as to adjust the brightness of the regions that need to be compensated on the display screen, thereby making the overall brightness of the display screen uniform. In addition, the brightness compensation control data will not have any impact on the smoothness of the current of the LED driving chip during the frequent adjustment process, realizing the smooth switching of the brightness of the display picture, and is particularly applicable in scenarios where the brightness uniformity requirement of the display screen is relatively high.

[0081] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A backlight driving method, characterized in that, Including steps: Obtaining the backlight brightness data of the image displayed on the display screen in real time; Obtaining the light-emitting parameters of each LED light source on the display screen according to the backlight brightness data; Generating a backlight control signal according to the light-emitting parameters; Generating brightness control data according to the light-emitting parameters; The step of generating brightness control data according to the light-emitting parameters includes: dividing the display screen into several display areas; obtaining the light-emitting parameters of the LED light sources in each display area; generating the brightness control data according to the light-emitting parameters; wherein, the light-emitting parameters include the current amplitude of the LED light source; Obtaining brightness compensation control data according to the brightness control data and the display screen size; Obtaining the display area to be compensated according to the display screen size; Obtaining the compensation value of the display area to be compensated; Generating the brightness compensation control data according to the display area to be compensated and the corresponding compensation value; The brightness compensation control data includes the display area to be compensated and the corresponding compensation value; Adjusting the brightness of the display area to be compensated on the display screen according to the backlight control signal and the brightness compensation control data; The step of adjusting the brightness of the display area to be compensated on the display screen according to the backlight control signal and the brightness compensation control data includes: Adjusting the current amplitude of the corresponding LED light source according to the backlight control signal and the compensation value of the display area to be compensated to increase the brightness of the corresponding LED light source; Wherein, the brightness compensation control data is separated from the brightness control data, the brightness control data and the brightness compensation control data are synchronized, the brightness control data is the brightness data for refreshing the display screen of the display, the brightness compensation control data is the compensated brightness data obtained through calculation according to the backlight brightness data and the display screen size, and the driving circuit for driving the display to display performs brightness compensation on the darker areas at the edge of the display screen according to the backlight control signal and the brightness compensation control data; the brightness compensation control data is obtained according to the display screen size and the current amplitude of the LED light source, records in real time the display area to be compensated on the display screen and the corresponding compensation value, and realizes brightness compensation by adjusting the current amplitude of the LED light source in the display area to be compensated.

2. A backlight driving system, characterized in that, Including: A main control module, an LED driving module and a display screen, and when the backlight driving system runs, it is used to implement the backlight driving method described in any one of claims 1; The main control module is connected to the LED driving module, and the main control module is used to obtain the backlight brightness data in real time, and obtain the backlight control signal and the brightness control data according to the backlight brightness data and output them to the LED driving module; The LED driving module is connected to the display screen, and the LED driving module is used to obtain the brightness compensation control data according to the brightness control data and the display screen size, and adjust the brightness of the display area to be compensated on the display screen according to the brightness compensation control data and the backlight control signal.

3. The backlight driving system according to claim 2, characterized in that, The main control module includes a main control unit, which is connected to the LED driving module. The main control unit is configured to obtain a backlight control signal and brightness control data based on the backlight brightness data and output them to the LED driving module.

4. The backlight driving system according to claim 3, wherein The LED driving module includes a micro control unit and an LED driving unit; The micro control unit is respectively connected to the main control unit and the LED driving unit. The micro control unit is configured to obtain the brightness compensation control data according to the brightness control data and the display screen size, and output the brightness compensation control data and the backlight control signal to the LED driving unit; The LED driving unit is connected to the display screen. The LED driving unit is configured to adjust the brightness of the display area to be compensated according to the brightness compensation control data and the backlight control signal.

5. The backlight driving system according to claim 4, wherein The display screen includes a plurality of display units. The plurality of display units are configured to divide the display screen into a plurality of display areas. Each display unit includes an LED light source. The brightness compensation control data includes the display area to be compensated and the compensation value of the display area to be compensated. The LED driving unit is configured to adjust the current amplitude of the corresponding LED light source according to the backlight control signal, the display area to be compensated, and the compensation value of the display area to be compensated, so as to adjust the brightness of the corresponding LED light source.

6. A display device, characterized in that, It includes the backlight driving system according to any one of claims 2-5.

Images