Brightness and color correction method and system of LED display screen

Abstract

The invention relates to the technical field of display, and provides a brightness and color correction method and system of an LED display screen, a temperature sensor is arranged on a substrate of the LED display screen, and the brightness and color correction method of the LED display screen comprises the steps of obtaining a current temperature value output by the temperature sensor; current adjustment parameters of the LED display screen are obtained according to the current temperature value and a preset parameter adjustment table describing the heat distribution adjustment parameter relation, and the current adjustment parameters are selected according to the heat distribution data corresponding to the current temperature value; and adjusting the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameter so as to correct the brightness and color of the different control areas.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to a brightness and color correction method and system for an LED display screen. Background Art

[0002] In the related art, the LED in the LED display screen of the display device will experience brightness decay as the temperature rises, resulting in color shift. When the display device is working, the temperature of each area of ​​the LED display screen may be inconsistent, resulting in uneven brightness and color of the display screen, affecting the user's visual experience.

[0003] How to calibrate the brightness and color of LED display screens and ensure the consistency of the brightness and color of LED display screens is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The object of the present invention is to provide a method and system for calibrating the brightness and color of an LED display screen, so as to solve the technical problem of uneven brightness and color of an LED display screen in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] On the one hand, the present invention provides a brightness and color correction method for an LED display screen. A temperature sensor is provided on a substrate of the LED display screen. The brightness and color correction method comprises: obtaining a current temperature value output by the temperature sensor; obtaining a current adjustment parameter of the LED display screen according to the current temperature value and a preset parameter adjustment table describing a relationship between thermal distribution and adjustment parameters, wherein the current adjustment parameter is selected according to thermal distribution data corresponding to the current temperature value; and adjusting brightness and color control data of different control areas of the LED display screen according to the current adjustment parameter to correct the brightness and color of the different control areas.

[0007] In one embodiment, the setting process of the parameter adjustment table includes: changing the working temperature of the LED display screen by setting different power-on time, using a thermal imager to collect thermal images of the LED display screen to obtain thermal distribution data, and collecting the temperature value of the temperature sensor at the same time; setting the brightness and color control data of different control areas according to the thermal distribution data; recording the thermal distribution data at different working temperatures, the corresponding temperature values ​​of the temperature sensors and the corresponding brightness and color control data of different control areas to obtain the parameter adjustment table.

[0008] In one embodiment, adjusting the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters includes: adjusting the driving current magnitudes of the light emitting chips of the different control areas according to the current adjustment parameters.

[0009] In one embodiment, the light emitting chip is an RGB LED light emitting chip, and the driving current of the light emitting chips in different control areas is adjusted according to the current adjustment parameter, including: adjusting the driving current of the RGB light emitting chips in different control areas according to the RGB configuration value of the current adjustment parameter.

[0010] In one embodiment, brightness and color control data of different control areas are set according to thermal distribution data, including: determining the temperature of each light-emitting chip on the thermal image according to the current temperature value and the corresponding relationship between the position of the temperature sensor on the substrate and the thermal image; and setting a corresponding light-emitting chip adjustment current for each light-emitting chip according to the temperature of each light-emitting chip on the thermal image.

[0011] In one embodiment, setting a corresponding light emitting chip adjustment current for each light emitting chip according to the temperature of each light emitting chip on the thermal image includes: setting a corresponding light emitting chip adjustment current for light emitting chips in an area on the substrate where the temperature exceeds 35 degrees Celsius.

[0012] In one embodiment, the temperature sensor is located in the middle of the substrate.

[0013] In one embodiment, before adjusting the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters, the method further includes: acquiring target color temperature data, and performing parameter correction on the current adjustment parameters according to the target color temperature data.

[0014] In one embodiment, brightness and color control data of different control areas are set according to thermal distribution data, including: dividing a thermal image into a plurality of image grids; determining the temperature of each image grid on the thermal image according to a current temperature value and a corresponding relationship between a position of a temperature sensor on a substrate and the thermal image; and setting the same light-emitting chip adjustment current for light-emitting chips of the same color corresponding to the same image grid according to the temperature of each image grid on the thermal image.

[0015] On the other hand, the present invention also provides a brightness and color correction system for an LED display screen, the brightness and color correction system comprising: a substrate, comprising a light-emitting circuit, a light-emitting chip, arranged on the substrate and electrically connected to the light-emitting circuit; a temperature sensor, arranged on the substrate; a controller, electrically connected to the light-emitting circuit and to the temperature sensor, for: obtaining current adjustment parameters of the LED display screen according to a current temperature value output by the temperature sensor and a pre-set parameter adjustment table describing a relationship between thermal distribution and adjustment parameters, wherein the current adjustment parameters are selected according to thermal distribution data corresponding to the current temperature value; adjusting brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters, and feeding them back to the light-emitting circuit to correct the brightness and color of the different control areas.

[0016] The beneficial effects of the brightness and color correction method and system of the LED display screen provided by the present invention are at least as follows: by presetting a parameter adjustment table and setting a temperature sensor on the LED display screen, corresponding thermal distribution data and corresponding adjustment parameters are selected from the parameter adjustment table according to the temperature collected by the temperature sensor, so that the brightness and color of different areas of the LED display screen can be controlled to ensure the uniformity of the brightness and color of different parts of the LED display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of an LED display screen provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a flow chart of a brightness and color correction method for an LED display screen provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of a process flow of setting a parameter adjustment table provided in an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of a brightness and color correction system for an LED display screen provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] In the related art, the LEDs in the LED display screen will experience brightness decay as the temperature rises, resulting in color shift. When the display device is working, the temperature of each area of ​​the LED display screen may be inconsistent, resulting in uneven brightness and color of the LED display screen.

[0025] The color of the LED display screen can be calibrated according to white. Specifically, white with a color temperature of 6500K can be used as the calibration reference color of the LED display screen. In order for the LED display screen to emit white light with a color temperature of 6500K, it is necessary to provide a set driving current for the LED chip in the LED display screen. If the LED chip is an RGB LED chip, that is, a red, green, and blue LED chip, in order to form a white light emission with a color temperature of 6500K, a set driving current can be provided for the red, green, and blue LED chips of the red, green, and blue LED chips, respectively, which can be recorded as the driving current IR0 of the red lamp bead, the driving current IG0 of the green lamp bead, and the driving current IB0 of the blue lamp bead.

[0026] When the temperature of the LED chip rises and the color shift occurs, the white light emitted by the LED chip may be bluish, that is, the color temperature of the light emitted by the LED chip increases. At this time, the color temperature of the LED chip light can be adjusted by adjusting the driving current of the LED chip. Specifically, the driving current of the red lamp bead can be increased, and the driving current of the green lamp bead can be reduced. If the red and green lamp beads of the red, green and blue LED chips are provided with currents IR1 and IG1, the driving current IR1 of the red lamp bead is greater than IR0, and the driving current IG1 of the green lamp bead is less than IG0. This solution can compensate for the brightness attenuation caused by the temperature rise of the LED chip and control the color temperature of the LED chip light at 6500K.

[0027] It can be seen that the driving current of the LED chip in the light-emitting area of ​​the LED display can be adjusted according to the temperature of the area where the LED chip is located, so as to solve the technical problem of inconsistent brightness and color in areas with different temperatures of the LED display in the prior art. Under laboratory conditions, thermal images can be used to observe the temperature of each part of the LED display, but when the LED display is working, it is impossible to use a thermal imager to collect the thermal image of the LED display in real time. However, the temperature of a certain position on the LED display can be measured, and the temperature of other areas of the LED display can be inferred through the historical thermal images corresponding to the temperature of this position. Specifically, the historical thermal images can be multiple thermal images collected in advance at different operating temperatures.

[0028] Furthermore, a temperature sensor can be set on the LED display screen. After measuring the temperature of a position on the LED display screen, the current temperature of each area on the LED display screen can be inferred based on the historical thermal image, and then the driving current of the LED chip corresponding to the temperature can be selected. By changing the configuration of the driving current of the LED chip, the color temperature of the LED chip after heating can be adjusted, so that the color temperature of the LED chip is maintained at 6500K.

[0029] Based on the above problems and solutions, an embodiment of the present invention provides a method and system for calibrating the brightness and color of an LED display screen.

[0030] The brightness and color correction method and system of the LED display screen according to the embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] In the technical solution of the embodiment of the present invention, the light emitting chip of the LED display screen is an LED chip. Figure 1 As shown, a temperature sensor 101 is provided at point A on the substrate 100 of the LED display screen, and the temperature of point A can be measured. After the electronic device including the LED display screen is produced, a thermal imager can be used to collect thermal images of the LED display screen, and the collected thermal images can be recorded. The temperature of point A is different in each recorded thermal image. In the actual application of the electronic device with the LED display screen, after the temperature of point A is collected, a thermal image corresponding to the temperature of point A can be selected. Through the thermal image, the temperature of each LED chip on the LED display screen can be obtained, so as to further determine the driving current of the corresponding LED chip that needs to be input when each LED chip emits 6500K white light at the current temperature. As Figure 1 As shown, the temperature sensor is located in the middle of the substrate. However, in practical applications, the location of the temperature sensor is not limited thereto.

[0032] Based on Figure 1 The temperature sensor is set at point A of the LED display as shown in FIG. Figure 2 As shown, the brightness and color correction method in the embodiment of the present invention includes:

[0033] Step S201, obtaining the current temperature value output by the temperature sensor.

[0034] Step S202, obtaining current adjustment parameters of the LED display screen according to the current temperature value and a preset parameter adjustment table describing the relationship between heat distribution and adjustment parameters, wherein the current adjustment parameters are selected according to heat distribution data corresponding to the current temperature value.

[0035] Specifically, the parameter adjustment table can set the correspondence between the current temperature value measured by the temperature sensor and the thermal distribution data, as well as the correspondence between the thermal distribution data and the adjustment parameters, so that when the current temperature value is known, the current adjustment parameters can be obtained by looking up the table. The adjustment parameters are the adjustment parameters of all light-emitting chips on the LED display that need to be adjusted due to temperature rise.

[0036] Step S203, adjusting the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters to calibrate the brightness and color of the different control areas.

[0037] Specifically, the current adjustment parameter may be a multiple of the original driving current of the light-emitting chip. The target driving current of the light-emitting chip may be determined according to the current adjustment parameter, and the target driving current may be input into the light-emitting chip, so that the light-emitting chip may emit light with a specified color temperature. The adjustment parameter is generally set for the light-emitting chip that needs to be adjusted due to temperature rise, and the driving current of the light-emitting chip that does not need to be adjusted remains the original driving current.

[0038] In the related art, the temperature of the substrate of a general LED display screen can reach about 40 degrees Celsius when it is working. In the technical solution of the embodiment of the invention, 45 degrees Celsius can be used as the dividing line. The light-emitting chips at positions below 45 degrees Celsius on the substrate of the LED backlight module do not need to be adjusted in parameters, and the light-emitting chips at positions equal to or above 45 degrees Celsius need to be adjusted in parameters. Among them, an adjustment parameter can be designed for each light-emitting chip at 45 degrees Celsius and above, and an adjustment parameter can also be designed for every two light-emitting chips at 45 degrees Celsius and above, and it is not limited to this. For example, when the original driving current is I0, the target driving current corresponding to 45 degrees Celsius can be designed as an adjustment parameter of 1.05*I0, and the target driving current corresponding to 46 degrees Celsius can be designed as an adjustment parameter of 1.06*I0.

[0039] According to the technical solution of the embodiment of the present invention, the adjustment parameters of various parts of the LED display screen can be determined according to the detected temperature of a point of the LED display screen, so that the brightness and color of the LED display screen can be simply and conveniently corrected to ensure the consistency of the brightness and color of the display screen.

[0040] Before obtaining the current adjustment parameters of the LED display according to the parameter adjustment table in step S202, it is necessary to first obtain the preset parameter adjustment table, and then search in the parameter adjustment table to obtain the current adjustment parameters corresponding to the current temperature value.

[0041] like Figure 3 As shown in the figure, the setting process of the parameter adjustment table includes:

[0042] Step S301, by setting different power-on durations, changing the working temperature of the LED display screen, using a thermal imager to collect thermal images of the LED display screen to obtain thermal distribution data, and at the same time collecting the temperature value of the temperature sensor.

[0043] Specifically, the temperature field information of each part of the LED display screen can be obtained based on the thermal image obtained by thermal image acquisition. Figure 1 Taking the temperature sensor shown as being set at point A as an example, the thermal image temperature of point A can be obtained based on the temperature field information, and the thermal image temperature matches the temperature value measured by the temperature sensor. The temperature field information is the thermal distribution data. Multiple historical thermal images and thermal distribution data can be obtained at different operating temperatures, and these thermal distribution data and the temperature measured by the temperature sensor are saved accordingly. In this way, when the temperature value of the temperature sensor is collected, the corresponding thermal distribution data can be matched, and then the temperature of each part of the LED display can be determined.

[0044] Step S302, setting brightness and color control data of different control areas according to the heat distribution data, wherein the brightness and color control data can be used to adjust the current of the light emitting chip.

[0045] Specifically, brightness and color control data can be set for each part of the LED display screen according to the temperature of each part of the LED display screen. For example, the driving current of the light-emitting chip in the part below 45 degrees Celsius can be set as the original driving current, and the corresponding light-emitting chip adjustment current can be set for the light-emitting chip in the area where the temperature exceeds 45 degrees Celsius on the substrate. The driving current of the light-emitting chip in the part above 45 degrees Celsius can be set as the driving current after weighting the original driving current, and the weighted value corresponding to each temperature is different.

[0046] Step S303, recording the heat distribution data at different working temperatures, the temperature values ​​of the corresponding temperature sensors, and the corresponding brightness and color control data of different control areas to obtain a parameter adjustment table.

[0047] In the process of setting the parameter adjustment table in the embodiment of the present invention, the working temperature of the LED display screen can be changed by powering on the LED display screen, and the longer the lighting time, the higher the working temperature. In the process of heating up the LED display screen, every time the temperature of point A of the LED display screen increases by 1 degree Celsius, a thermal image of the LED display screen is collected using a thermal imager, and the collected thermal image and the current temperature of point A are recorded accordingly. Furthermore, the temperature field information of each part of the LED display screen can be obtained based on the thermal image, that is, the temperature of each part of the LED display screen can be obtained. Corresponding to the temperature of each part of the LED display screen, the adjusted driving current of the corresponding light-emitting chip can be set to control the color temperature of the light emitted by the light-emitting chip.

[0048] Based on the above information, a parameter adjustment table describing the one-to-one correspondence between the temperature at point A, the thermal image, and the driving current of all light-emitting chips can be established. Thus, when the LED display is working, the brightness and color control data of all light-emitting chips can be obtained by looking up the parameter adjustment table according to the collected temperature at point A. Based on the brightness and color control data, the adjusted driving current of the light-emitting chip, i.e., the target driving current of the light-emitting chip, can be obtained.

[0049] When setting the brightness and color control data of different control areas according to the thermal distribution data, the light emitting chip adjustment current can be set for each light emitting chip, or for a regional chipset consisting of multiple light emitting chips. For example, eight light emitting chips can be used as a regional chipset, the average temperature of the regional chipset can be obtained, and a light emitting chip adjustment current can be set for the average temperature. Specifically, the driving current of the light emitting chip is usually selected from three current values, and the light emitting chip adjustment current is the driving current of the light emitting chip after selecting a specific current value.

[0050] Specifically, in step S302, the temperature of each light-emitting chip on the thermal image can be determined according to the current temperature value and the correspondence between the position of the temperature sensor on the substrate and the thermal image; and the corresponding light-emitting chip adjustment current is set for each light-emitting chip according to the temperature of each light-emitting chip on the thermal image.

[0051] Specifically, the position of the temperature sensor on the substrate may be point A. The temperature of each part of the LED display screen may be determined based on the temperature value of point A and the corresponding thermal image. The temperature of each light-emitting chip of the LED display screen may be determined based on the position of the light-emitting chip of the LED display screen, so that the corresponding light-emitting chip adjustment current may be set for each light-emitting chip based on the temperature of each light-emitting chip.

[0052] In the embodiment of the present invention, a corresponding thermal image may be set for every 1 degree Celsius rise in temperature at point A, or a corresponding thermal image may be set for every 2 degrees Celsius rise in temperature at point A, and the present invention is not limited thereto. A corresponding light-emitting chip adjustment current may be set for each light-emitting chip when the temperature of the light-emitting chip rises by 1 degree Celsius, or a corresponding light-emitting chip adjustment current may be set for each light-emitting chip when the temperature of the light-emitting chip rises by 2 degrees Celsius. For example, a light-emitting chip located at point B (not shown in the figure) on an LED display screen corresponds to a first light-emitting chip adjustment current set at 46 degrees Celsius and a second light-emitting chip adjustment current set at 47 degrees Celsius. If the temperature of the light-emitting chip at point B in the thermal distribution data of the thermal image is 46.4 degrees, then the chip adjustment current corresponding to the light-emitting chip at point B is the first light-emitting chip adjustment current.

[0053] In addition, in step S302, the thermal image can be divided into a plurality of image grids; the temperature of each image grid on the thermal image is determined according to the current temperature value and the corresponding relationship between the position of the temperature sensor on the substrate and the thermal image; and the same light-emitting chip adjustment current is set for the light-emitting chips of the same color corresponding to the same image grid according to the temperature of each image grid on the thermal image. The number of light-emitting chips in the image grid can be eight, that is, each image grid is a regional chipset.

[0054] Specifically, the position of the temperature sensor on the substrate may be point A mentioned above. The average temperature of each image grid of the LED display screen may be determined based on the temperature value of point A and the corresponding thermal image. The temperature of each light-emitting chip of the LED display screen may be determined based on the image grid position of the light-emitting chip of the LED display screen, so that the corresponding light-emitting chip adjustment current may be set for each light-emitting chip based on the temperature of each light-emitting chip. For example, if the average temperature of the first image grid is 47 degrees, the temperature of all the light-emitting chips covered by the first image grid may be determined to be 47 degrees, and the chip adjustment current corresponding to all the light-emitting chips covered by the first image grid is the second light-emitting chip adjustment current.

[0055] In step S203, the driving current of the light emitting chips in different control areas can be adjusted according to the current backlight adjustment parameters. Specifically, the light emitting chip can be an RGB LED light emitting chip. When the driving current of the light emitting chips in different control areas is adjusted according to the current adjustment parameters, the driving current of the RGB light emitting chips in different control areas can be adjusted according to the RGB configuration value of the current adjustment parameters.

[0056] Specifically, the three LED chips of the red, green and blue tricolor LED chips can be provided with set original driving currents respectively, which can be recorded as the driving current IR0 of the red LED chip, the driving current IG0 of the green LED chip, and the driving current IB0 of the blue LED chip. The adjustment parameters include RGB configuration values. For example, the configuration value of the red LED chip can be set to 1.1, the configuration value of the green LED chip can be set to 0.9, and the configuration value of the blue LED chip can be set to 1. At this time, the target driving current of the red LED chip is 1.1*IR0, the target driving current of the green LED chip is 0.9*IG0, and the target driving current of the blue LED chip is IB0.

[0057] When the temperature of the LED chip rises and the color shift occurs, the white light emitted by the LED chip may be bluish, that is, the color temperature of the light emitted by the LED chip increases. At this time, the color temperature of the light emitted by the LED chip can be adjusted by adjusting the driving current of the LED chip. Specifically, the driving current of the red LED chip can be increased, and the driving current of the green LED chip can be reduced. If the driving current is adjusted, the currents IR1 and IG1 provided to the red and green LED chips of the red, green and blue LED chips, at this time, the driving current IR1 of the red LED chip is greater than IR0, and the driving current IG1 of the green LED chip is less than IG0. This solution can compensate for the brightness attenuation caused by the temperature rise of the LED chip and control the color temperature of the light emitted by the LED chip at 6500K.

[0058] Before step S203, the target color temperature data can be obtained, and the current adjustment parameters can be corrected according to the target color temperature data. Specifically, the target color temperature data can be input by the user through the human-computer interaction interface, or can be pre-set in the memory and obtained by the controller when needed. The target color temperature data can be 6500K. At this time, there is no need to correct the current adjustment parameters. If the target color temperature data is not 6500K, the current adjustment parameters can be corrected according to the relationship between the target color temperature change and the drive current change. The relationship between the target color temperature change and the drive current change can be obtained through experience or experiments.

[0059] Based on the ideas of the above technical solutions, such as Figure 4 As shown, the present invention provides a brightness and color correction system for an LED display screen, comprising:

[0060] The substrate includes a light emitting circuit 401 .

[0061] The light emitting chip 402 is disposed on the substrate and electrically connected to the light emitting circuit.

[0062] The temperature sensor 403 is disposed on the substrate.

[0063] The controller 404 is electrically connected to the light-emitting circuit and to the temperature sensor, and is used to: obtain the current adjustment parameters of the LED display screen according to the current temperature value output by the temperature sensor and a preset parameter adjustment table describing the relationship between the thermal distribution and the adjustment parameters, wherein the current adjustment parameters are selected according to the thermal distribution data corresponding to the current temperature value; adjust the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters, and feed it back to the light-emitting circuit to correct the light output color of the different control areas.

[0064] In the process of setting the parameter adjustment table in the embodiment of the present invention, the LED display screen can be powered on and lit up. The longer the lighting time is, the higher the working temperature is, so as to change the working temperature of the LED display screen. In the process of heating up the LED display screen, every time the temperature of point A of the LED display screen increases by 1 degree Celsius, a thermal image of the LED display screen is collected using a thermal imager, and the collected thermal image and the current temperature of point A are recorded accordingly. Furthermore, the temperature field information of each part of the LED display screen can be obtained according to the thermal image, that is, the temperature of each part of the LED display screen can be obtained. Corresponding to the temperature of each part of the LED display screen, the adjusted driving current of the corresponding light-emitting chip can be set to control the color temperature of the light emitted by the light-emitting chip.

[0065] The parameter adjustment table can be stored in the controller or in the controller's host computer and can be obtained when the controller needs it. The parameter adjustment table is a database file that describes the one-to-one correspondence between the temperature at point A, the thermal image, and the driving current of all light-emitting chips. When the LED display screen is working, the brightness and color control data of all light-emitting chips can be obtained by looking up the parameter adjustment table according to the collected temperature at point A. According to the brightness and color control data, the adjusted driving current of the light-emitting chip, that is, the target driving current of the light-emitting chip, can be obtained. The target driving current is input into the light-emitting chip by the light-emitting circuit, so that the color temperature of the light emitted by the light-emitting chip can be controlled.

[0066] Specifically, the parameter adjustment table can set the correspondence between the current temperature value measured by the temperature sensor and the thermal distribution data, as well as the correspondence between the thermal distribution data and the backlight adjustment parameters, so that when the current temperature value is known, the current adjustment parameters can be obtained by looking up the table. The adjustment parameters are the adjustment parameters of all light-emitting chips on the LED display that need to be adjusted due to temperature rise.

[0067] Furthermore, the adjustment parameters are generally set for the light-emitting chips that need to be adjusted due to temperature rise, and the driving current of the light-emitting chips that do not need to be adjusted remains the original driving current. The driving current of the light-emitting chips below 45 degrees Celsius can be set as the original driving current, and the corresponding light-emitting chip adjustment current can be set for the light-emitting chips in the area on the substrate where the temperature exceeds 45 degrees Celsius.

[0068] According to the technical solution of the embodiment of the present invention, the adjustment parameters of various parts of the LED display screen can be determined according to the detected temperature of a point of the LED display screen, so that the brightness and color of the LED display screen can be simply and conveniently corrected to ensure the consistency of the brightness and color of the display screen.

[0069] According to the brightness and color correction method and system of the LED display screen provided by the embodiment of the present invention, by pre-setting a parameter adjustment table and setting a temperature sensor on the display screen, corresponding thermal distribution data and corresponding adjustment parameters are selected from the parameter adjustment table according to the temperature collected by the temperature sensor, so that the brightness and color of different areas of the LED display screen can be controlled to ensure the uniformity of the brightness and color of different parts of the LED display screen.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calibrating brightness and color of an LED display screen, characterized in that: A temperature sensor is provided on the substrate of the LED display screen, and the brightness and color correction method comprises: Obtaining the current temperature value output by the temperature sensor; Obtaining the current adjustment parameters of the LED display screen according to the current temperature value and a preset parameter adjustment table describing the relationship between the heat distribution adjustment parameters, wherein the current adjustment parameters are selected according to the heat distribution data corresponding to the current temperature value; The brightness and color control data of different control areas of the LED display screen are adjusted according to the current adjustment parameters to correct the brightness and color of the different control areas.

2. The brightness and color correction method of an LED display screen as claimed in claim 1, characterized in that: The setting process of the parameter adjustment table includes: By setting different power-on durations, the operating temperature of the LED display screen is changed, a thermal imager is used to collect thermal images of the LED display screen to obtain thermal distribution data, and the temperature value of the temperature sensor is collected at the same time; Setting brightness and color control data of different control areas according to the heat distribution data; The heat distribution data at different working temperatures, the temperature values ​​of the corresponding temperature sensors and the corresponding brightness and color control data of different control areas are recorded to obtain the parameter adjustment table.

3. The brightness and color correction method of an LED display screen as claimed in claim 1, characterized in that: Adjusting the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters includes: The driving current magnitudes of the light emitting chips in the different control areas are adjusted according to the current adjustment parameters.

4. The brightness and color correction method of an LED display screen as claimed in claim 1, characterized in that: The light emitting chip is an RGB LED light emitting chip, and the driving current of the light emitting chips in different control areas is adjusted according to the current adjustment parameter, including: The driving currents of the RGB light-emitting chips in the different control areas are adjusted according to the RGB configuration values ​​of the current adjustment parameters.

5. The brightness and color correction method of an LED display screen as claimed in claim 2, characterized in that: The brightness and color control data of different control areas are set according to the heat distribution data, including: Determine the temperature of each light-emitting chip on the thermal image according to the current temperature value and the corresponding relationship between the position of the temperature sensor on the substrate and the thermal image; A corresponding light emitting chip adjustment current is set for each light emitting chip according to the temperature of each light emitting chip on the thermal image.

6. The brightness and color correction method of an LED display screen as claimed in claim 5, characterized in that: Setting a corresponding light emitting chip adjustment current for each light emitting chip according to the temperature of each light emitting chip on the thermal image includes: setting a corresponding light emitting chip adjustment current for light emitting chips in an area on the substrate where the temperature exceeds 35 degrees Celsius.

7. The brightness and color correction method of an LED display screen as claimed in claim 1, characterized in that: The temperature sensor is located in the middle of the substrate.

8. The brightness and color correction method of an LED display screen as claimed in claim 1, characterized in that: Before adjusting the brightness and color control data of different control areas of the LED display screen according to the current adjustment parameters, the method further includes: Target color temperature data is acquired, and the current adjustment parameters are corrected according to the target color temperature data.

9. The brightness and color correction method of an LED display screen as claimed in claim 2, characterized in that: The brightness and color control data of different control areas are set according to the heat distribution data, including: dividing the thermal image into a plurality of image grids; Determine the temperature of each image grid on the thermal image according to the current temperature value and the corresponding relationship between the position of the temperature sensor on the substrate and the thermal image; The same light emitting chip adjustment current is set for light emitting chips of the same color corresponding to the same image grid according to the temperature of each image grid on the thermal image.

10. A brightness and color correction system for an LED display screen, characterized in that: The brightness and color correction system comprises: A substrate including a light emitting circuit, A light-emitting chip is disposed on the substrate and is electrically connected to the light-emitting circuit; A temperature sensor is disposed on the substrate; A controller is electrically connected to the light emitting circuit and the temperature sensor, and is used for: Obtaining current adjustment parameters of the LED display screen according to the current temperature value output by the temperature sensor and a preset parameter adjustment table describing the relationship between heat distribution and adjustment parameters, wherein the current adjustment parameters are selected according to the heat distribution data corresponding to the current temperature value; The brightness and color control data of the different control areas of the LED display are adjusted according to the current adjustment parameters, and fed back to the light-emitting circuit to correct the brightness and color of the different control areas.

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