LED display screen control device capable of automatically adjusting display

Abstract

The utility model discloses an LED display screen control device capable of automatically adjusting display, which relates to the technical field of LED display, and comprises a sending box, an LED screen and an upper computer, an interface board and a peripheral circuit part are arranged in the sending box, a receiving card connected with the sending box is also arranged in the sending box, a brightness color temperature adjusting module and a gray level adjusting module are arranged in the receiving card, and the brightness color temperature adjusting module and the gray level adjusting module are connected with the upper computer. The brightness color temperature adjusting module and the gray scale adjusting module are connected with the LED screen. According to the utility model, parameters such as a screen watching distance, the lowest brightness and the highest brightness of the screen and the like are transmitted to the sending box through the upper computer, the sending box analyzes information of each frame of picture of the LED screen and receives environment brightness and color temperature information, and the receiving card adjusts display parameters of the LED screen through the brightness and color temperature adjusting module and the gray level adjusting module according to the parameters. And finally, the optimal display effect of the LED screen is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED display, in particular to an LED display screen control device capable of automatically adjusting display. Background Art

[0002] With the development of full-color LED display screens, the application scenarios are constantly expanding, and they are applied to indoor all-in-one machines and other scenarios with higher requirements for display effects. However, different manufacturers, even different batches of LED lamp beads from the same manufacturer, have slight differences in actual display color accuracy. In addition, the display effects that can be achieved by different LED driver chips, such as grayscale depth, minimum achievable brightness, maximum brightness and other parameters are very different. In addition, the actual viewing distance is very different, and the lighting conditions are constantly changing, resulting in unpredictable actual viewing effects for users; therefore, there is an urgent need for a full-color LED display control system that can automatically manage display effects, so as to automatically adapt to different application scenarios, light boards using different driver chips and lamp beads, and scenes with constantly changing environments.

[0003] Chinese patent document CN214897395U discloses "a brightness adjustment device for an LED display screen". It includes a display, a bracket, a brightness adjuster, a power input port and a light bar output port. The display surface is mounted with a display screen, the bottom of the display is connected to the bracket by welding, the surface of the bracket is fixedly connected to the brightness adjuster, the surface of the brightness adjuster is mounted with a light bar output port, the surface of the brightness adjuster is mounted with a power input port, the surface of the brightness adjuster is mounted with a dimming knob, and the surface of the brightness adjuster is mounted with a brightness bar. However, this patent adjusts the viewing angle and display brightness value of the LED screen at the physical level to adapt to environmental changes, but this method cannot effectively achieve precise control of the screen brightness according to the physical environment, cannot adapt to environments in more states, and reduces the compatibility of the LED screen. Summary of the invention

[0004] The utility model mainly solves the technical problem that the original LED display screen cannot automatically cope with various hardware configurations and complex application environments to achieve the best display effect. It provides an LED display screen control device that automatically adjusts display parameters. This patent transmits parameters such as screen viewing distance, minimum and maximum screen brightness to a sending box through a host computer. The sending box analyzes the information of each frame of the LED screen and receives the ambient brightness and color temperature information. The receiving card adjusts the LED screen display parameters such as grayscale level, brightness color temperature, etc. through a brightness and color temperature adjustment module and a grayscale adjustment module according to the above parameters, ultimately allowing the LED screen to achieve the best display effect.

[0005] The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: the utility model includes a sending box, an LED screen and a host computer, the sending box is provided with an interface board and a peripheral circuit part, and is also provided with a receiving card connected to the sending box, the receiving card is provided with a brightness and color temperature adjustment module and a grayscale adjustment module, and the brightness and color temperature adjustment module and the grayscale adjustment module are connected to the LED screen.

[0006] Preferably, the interface board is provided with an FPGA chip, the FPGA chip is provided with a DPC module and a DDR storage module, a network data sending module and a control signal data processing module, the interface board includes a connector CN1, the connector CN1 is provided with an LVDS differential interface and an ADC interface for temperature and brightness, a SerDes interface and a network interface.

[0007] Preferably, the peripheral circuit part of the sending box includes an HDMI / DP socket and an audio and video decoding unit, and also includes an Ethernet interface, a Gigabit network interface and an ambient brightness color temperature sensor. The serdes interface is connected to the Gigabit network interface, the temperature and brightness ADC interface is connected to the ambient brightness color temperature sensor, and the Ethernet interface is connected to the host computer.

[0008] Preferably, the receiving card is provided with an FPGA chip, the grayscale adjustment module and the brightness and color temperature adjustment module are arranged in the FPGA chip, the grayscale adjustment module includes a grayscale level extension unit and a grayscale fine adjustment unit, and the receiving card is provided with a gigabit network receiving port, and the gigabit network receiving port is connected to the gigabit network interface.

[0009] Preferably, the DPC module is connected to the network data sending module via the DDR storage module, the network data sending module is connected to the Gigabit network interface, and the ambient brightness color temperature sensor and the Ethernet interface are connected to the DPC module and the network data sending module via the control signal data processing module.

[0010] Preferably, the FPGA chip is provided with an sdram storage unit, a light board correction unit and a scanning unit.

[0011] Preferably, the audio and video decoding unit includes a chip U12, and the chip U12 is provided with a LVDS differential signal sending part, an I2S signal part and a HDMI / DP receiving part, the LVDS differential signal sending part is connected to the LVDS differential interface, and the HDMI / DP receiving part is connected to the HDMI / DP socket.

[0012] Preferably, the LED screen is provided with a plurality of LED light boards, the LED light boards are provided with driving chips and lamp beads, and the LED light boards are connected to a receiving card.

[0013] The beneficial effects of the utility model are as follows: the patent uses the ambient brightness and color temperature sensor to sense the changes in the brightness and color temperature of the environment to adjust the brightness and color temperature, ensuring that the content of the LED screen remains real and natural when viewed by the user. According to the content of the displayed screen, the upper limit of the brightness is increased through the DPC function unit, while maintaining the display effect and reducing the power consumption of the LED screen. The grayscale expansion function unit adds an adjustable extension bit function, and automatically sets the grayscale extension bit according to the viewing distance and the minimum brightness. This function is run under appropriate conditions to avoid the problem of users seeing image jitter. The sending box and the receiving card perform data processing in combination with the display parameters and environmental parameters of the LED screen, so that the LED screen can achieve the optimal values ​​of display brightness, color temperature and grayscale extension bits in a variety of usage scenarios, and finally realize the LED screen's adaptiveness to different application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a cross-sectional view of an LED display screen device that automatically adjusts the display according to the present invention.

[0015] Figure 2 The structure diagram of a sending box with automatic adjustment display is provided in this utility model.

[0016] Figure 3 The structure diagram of a receiving card for automatically adjusting display is shown in the figure.

[0017] Figure 4 This is a practical circuit connection diagram of a HDMI / DP socket.

[0018] Figure 5 The present invention is a circuit connection diagram of an audio and video decoding unit.

[0019] Figure 6 The following is a circuit connection diagram of an interface board for this practical application.

[0020] Figure 7 This is a circuit connection diagram of an Ethernet chip for this practical application.

[0021] In the picture, 1. LED light board, 2. receiving card, 3. shell. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0023] Embodiment: This embodiment is an LED display screen control device that automatically adjusts the display. The purpose of this invention is to set a display control circuit to adaptively adjust the brightness of the display screen according to the brightness state changes of the actual environment to adapt to the actual environment, so that users can clearly identify the display content on the display screen under various environmental conditions. When the existing display screen is adjusted to adapt to the environment, in most cases, the brightness value of the screen is manually adjusted after the environmental brightness changes are manually sensed to ensure that the LED screen adapts to the current environmental state. The method of manually adjusting the display state of the LED screen can neither accurately adjust the various parameters of the LED screen so that the LED screen can achieve the best display state in a variety of environments, but is also affected by the reaction speed and perception ability of the adjuster, resulting in a lag in adjusting the display state of the LED screen, and the problem of being unable to adjust the best LED display state to adapt to the environment. Therefore, in order to solve the problem that the LED screen cannot adapt to the environment to automatically adjust the display effect of the LED screen. In this embodiment, Figures 1 to 3 As shown, the LED display screen control device that automatically adjusts the display includes a display adjustment part and a display part. The display part includes a plurality of LED light boards 1. Different LED light boards 1 use different types of driver chips to drive corresponding lamp beads, so that different light boards can achieve adjustment changes within different brightness ranges, broaden the brightness change range of the display screen, and thus improve the compatibility of the LED display screen with more environments. The receiving card is wrapped between the LED light board and the outer shell. The display adjustment part includes a sending box and a receiving card. The sending box is provided with an interface board and a peripheral circuit. The peripheral circuit includes various types of connectors and audio decoding units. The input includes a video source, ambient brightness and color temperature, and a host computer control signal (brightness value, viewing distance, minimum brightness, maximum brightness, and color coordinates, etc.), and the output includes an audio signal and an LED screen display image. The input enters the sending box through the connector, and the output is also transmitted to the receiving card through the connector. The connector includes an HDMI / DP socket, an ambient color temperature and brightness interface, an audio output interface, an Ethernet interface, and a Gigabit network interface. The connector on the sending box 5 includes an HDMI / DP socket, such as Figure 6 As shown, the HDMI / DP socket includes a chip CN12 and a chip U15. The chip CN12 is connected to the pin 17 of the chip U15 through the pin 2. The HDMI / DP line is connected through the HDMI / DP socket to introduce the HDMI / DP signal from the display screen to the sending box 5; the audio output unit transmits the audio signal parsed by the audio decoding unit to the device connected outside the sending box 5; the ambient color temperature and brightness interface, through which the actual ambient brightness and color temperature detection results of the display screen are transmitted to the ambient brightness and color temperature sensor for analysis and confirmation; the Ethernet interface transmits the signal controlled by the host computer to the Ethernet part, such as Figure 7As shown, the Ethernet interface includes chip U5, which is an Ethernet PHY chip. The model of chip U5 used in this embodiment is YT8512. The chip receives the network signal sent by the host computer, converts it into RMII signal and sends it to the control signal data processing module in FPGA for processing. Gigabit network interface, the sending box transmits the processed display data parameters to the receiving card 2 through several Gigabit network ports.

[0024] The interface board in the sending box 5 includes an FPGA chip and a connector, such as Figure 6 As shown, the connector is CN1, which is connected to the FPGA chip and the connection port. The interface board has an LVDS differential interface for receiving the video signal transmitted by the audio decoding unit; a 100M network interface for receiving the network control signal transmitted by the Ethernet part; a temperature and brightness ADC interface for receiving the ambient brightness and color temperature results collected by the ambient brightness and color temperature sensor; and a serdes interface for transmitting the parameters to the receiving card 3 in the form of a gigabit network signal. Figure 5 As shown, chip U12 is the main operating part of the audio and video decoding unit. This part uses the HDMI / DP receiving chip IT6802, which is responsible for receiving HDMI / DP signals and sending LVDS differential signals that the FPGA can receive to the FPGA interface board. Chip U12 also transmits I2S signals to the audio output unit for audio output and connection to external speakers. The FPGA core is chip U1, and the FPGA chip model used in this embodiment is EG4S20BG256. The LED screen broadcast display status is directly imported into the audio decoding unit for processing after being received via the HDMI / DP socket. The data processed by the audio decoding unit is processed by the DPC function module and the image scaling module inside the FPGA chip and then transmitted to the post-DDR memory management module. The module reads the processed data in sequence, and after reading, the processed data is split into several parts and sent to the receiving card 2 from several gigabit network interfaces through the network data sending module for subsequent processing.

[0025] The Gigabit network receiving port set in the receiving card 3 obtains the data transmitted by the sending box 5 and puts it into the FPGA for processing. The FPGA part in the receiving card 3 includes a brightness and color temperature adjustment module, a grayscale registration expansion unit, and a grayscale fine adjustment unit. The data flow of the FPGA processing the transmission of the sending box is as follows: first, the network data is split into video data streams and control data according to type, which includes ambient brightness values ​​and color temperature values; then the video data stream is sequentially passed through image segmentation, gamma conversion, brightness and color temperature adjustment, grayscale expansion and other modules; then the brightness and color temperature adjustment module and the grayscale expansion module adjust the effect through the parameters in the control data; finally, the display interface on the receiving card is transmitted to the driver chip on the light board through the scanning display unit to drive the LED. After completing the above processing, the sdram storage unit in the receiving card 2 receives the data processed by the FPGA and transmits it to the LED light board 1 for data adaptation after passing through the light board correction unit and the scanning display unit.

[0026] Therefore, in this embodiment, the following method is used to improve the degree of fit between the display screen brightness and the ambient brightness state during adaptive adjustment. Before adjusting the screen brightness, it is first necessary to measure the minimum brightness and maximum brightness of the LED display screen and the color coordinates of the maximum brightness through the brightness meter in the ambient brightness color temperature sensor, and set them in the host computer together with the actual viewing distance as a measurement indicator. According to the minimum brightness and the actual viewing distance, the host computer sets the specific value of the extended grayscale depth of the grayscale level extension in the receiving card 2 according to the corresponding table of the minimum brightness and the acceptable extended grayscale depth of the viewing distance obtained from the actual detection results, and sends it to the grayscale extension unit in the receiving card 2 through the control signal transmission channel. The extended grayscale depth ranges from 0 to 6 bits. The larger the extended depth, the more obvious the jitter of the screen display. This function is turned off when the extended grayscale depth value is 0. Therefore, it can be seen that the smaller the minimum brightness, the greater the extended grayscale depth at the same viewing distance; the farther the viewing distance, the greater the extended grayscale depth at the same minimum brightness. When the display screen adjusts its own display brightness to adapt to the actual ambient brightness state changes, the video source played by the display screen is input to the sending box through the HDMI / DP interface in the connection port. The audio and video decoding unit in the sending box separates the audio and video into video data and control data, and the video data needs to enter the FPGA for processing. During processing, it first passes through the DPC function module in the FPGA chip. The DPC function module controls the average value of the grayscale value of the picture below a certain limit value and sets the value to b, that is, a limit standard is set under the current ambient brightness state to avoid the subsequent screen from floating values ​​when adaptively adjusting its own brightness changes. The upper computer sends the maximum brightness of the LED screen to the DPC function module through the control signal transmission channel. The DPC function module automatically sets the DPC limit value based on the actual brightness obtained by the ambient brightness color temperature sensor and the maximum brightness of the LED screen. Therefore, when the average value avg of the pixel grayscale value of a frame played by the display screen is greater than the limit value, the limit value b is first obtained based on the maximum brightness and the current ambient brightness. The grayscale values ​​of all pixels in the picture are divided by the average value avg and then multiplied by the limit value b to obtain the grayscale value output by the pixel of this frame. Then the image is scaled and other image processing is performed on the screen and written into the DDR module. The network data sending module reads the temporarily stored DDR data and splits it into several data blocks. The split data blocks are distributed to each gigabit network port in turn and sent to the receiving card 2.

[0027] The receiving card 3 receives the data block transmitted by the sending box 5 through the gigabit network interface, and the data block is transmitted to the FPGA chip in the receiving card for the next step of data parameter processing. The FPGA on the receiving card 3 first performs network data analysis and splits the data into display data and control data. The display data only captures the screen belonging to the display area of ​​the receiving card 2 and sends it to the next level. The SDR display data is generally an 8-bit grayscale value. The display data separated by the analysis also needs to undergo image segmentation and gamma transformation processing steps. After gamma transformation, 22-bit display data is generated and transmitted to the brightness and color temperature adjustment module. The display data passes through the brightness and color temperature adjustment unit and, according to the brightness value sent by the host computer, the red, green and blue display data are multiplied by a brightness value coefficient as a whole. The red, green and blue grayscale values ​​are multiplied by a coefficient according to the ambient light and the default color temperature value to obtain the target color temperature value. The 22-bit display data output after gamma conversion is converted into 16-bit grayscale values ​​that can be received by the actual light board driver chip through the grayscale expansion unit and the grayscale fine adjustment unit. During the conversion process, the number of 1 to 6 bits of the 22 bits to be reset to zero is selected according to the minimum gray brightness, the current ambient brightness, and the viewing distance. This method is used to control the strength of the display screen jitter to achieve a balance between the display effect and the algorithm shortcomings. A mapping table is set in the grayscale fine adjustment unit. After the display data passes through the grayscale expansion unit, the grayscale value is input and a new grayscale value can be obtained according to the mapping table. The grayscale value of the display is adjusted according to the new grayscale value to improve the accuracy of the display grayscale level.

[0028] The host computer transmits the color coordinates of the LED screen to the brightness and color temperature adjustment unit of the receiving card 2 through the control signal transmission channel; after the brightness and color temperature adjustment module of the receiving card 2 receives the actual ambient color temperature of the brightness sensor, it automatically adjusts the color temperature of the display screen in combination with the standard color coordinates of the display screen. When adjusting the color temperature, after the pre-processing of the sending box and the receiving card 2, the specific adjustment standard for adjusting the display screen parameters is converted into a data control signal and transmitted to the light board correction unit. The light board correction unit corrects the slight difference in the brightness of each light point by multiplying the grayscale value of each pixel on the light board by the coefficient corresponding to the adjustment standard, and finally writes it to the sdram storage unit. After the scanning display unit reads the display data in the sdram, it outputs it according to the driving timing requirements on the light board, sends it to the driver chip on the light board to connect the LED light, and finally realizes the adaptive adjustment of the display screen brightness and the environment, ensuring that the user can maintain a good use state under different ambient brightness conditions. The display screen control circuit in this embodiment only requires the LED screen 1 to use a brightness sensor and a color temperature sensor to measure and record the minimum and maximum brightness and the viewing distance, and to increase the adjustable limit value of the display screen brightness through the DPC function unit to cope with different ambient brightness scenes; the grayscale extension function unit increases the adjustable extension bit function, automatically sets the grayscale extension bit according to the viewing distance and the minimum brightness, to avoid the problem of image jitter seen by the user; the brightness color temperature part realizes the function of automatically adjusting the color temperature value of the LED screen according to the ambient color temperature according to the recorded original color temperature value and the ambient color temperature value. This enables the display screen to realize adaptive different application scenarios, and at the same time, in order to further increase the compatibility of the display screen with various environments and various hardware configurations.

Claims

1. A LED display screen control device that automatically adjusts the display, characterized in that: It includes a sending box, an LED screen and a host computer. The sending box is provided with an interface board and a peripheral circuit part, and is also provided with a receiving card connected to the sending box. The receiving card is provided with a brightness and color temperature adjustment module and a grayscale adjustment module. The brightness and color temperature adjustment module and the grayscale adjustment module are connected to the LED screen.

2. The LED display screen control device for automatically adjusting display according to claim 1, characterized in that: The interface board is provided with an FPGA chip, the FPGA chip is provided with a DPC module and a DDR storage module, a network data sending module and a control signal data processing module, and the interface board includes a connector CN1, the connector CN1 is provided with an LVDS differential interface and an ADC interface for temperature and brightness, a SerDes interface and a network interface.

3. The LED display screen control device for automatically adjusting display according to claim 2, characterized in that: The peripheral circuit part of the sending box includes an HDMI / DP socket and an audio and video decoding unit, an Ethernet interface, a Gigabit network interface and an ambient brightness color temperature sensor, the serdes interface is connected to the Gigabit network interface, the temperature and brightness ADC interface is connected to the ambient brightness color temperature sensor, and the Ethernet interface is connected to a host computer.

4. The LED display screen control device for automatically adjusting display according to claim 3, characterized in that: The receiving card is provided with an FPGA chip, the grayscale adjustment module and the brightness and color temperature adjustment module are arranged in the FPGA chip, the grayscale adjustment module includes a grayscale level extension unit and a grayscale fine adjustment unit, and the receiving card is provided with a gigabit network receiving port, and the gigabit network receiving port is connected to the gigabit network interface.

5. The LED display screen control device for automatically adjusting display according to claim 3, characterized in that: The DPC module is connected to the network data sending module through the DDR storage module, the network data sending module is connected to the Gigabit network interface, and the ambient brightness color temperature sensor and the Ethernet interface are connected to the DPC module and the network data sending module through the control signal data processing module.

6. The LED display screen control device for automatically adjusting display according to any one of claims 2 to 4, characterized in that: The FPGA chip is provided with an sdram storage unit, a light board correction unit and a scanning unit.

7. The LED display screen control device for automatically adjusting display according to claim 3, characterized in that: The audio and video decoding unit includes a chip U12, which is provided with a LVDS differential signal sending part, an I2S signal part and an HDMI / DP receiving part. The LVDS differential signal sending part is connected to the LVDS differential interface, and the HDMI / DP receiving part is connected to the HDMI / DP socket.

8. The LED display screen control device for automatically adjusting display according to claim 7, characterized in that: The LED screen is provided with a plurality of LED light boards, the LED light boards are provided with driving chips and lamp beads, and the LED light boards are connected to the receiving card.

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