CN112634824A - Mini-LED display screen splicing display driving system and driving display method - Google Patents
Mini-LED display screen splicing display driving system and driving display method Download PDFInfo
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
The embodiment of the invention discloses a spliced display driving system and a spliced display driving method for a Mini-LED display screen. The method comprises the steps that display data are read from a storage module through a display data processing unit, the read data and addresses are transmitted to a cache unit, an RGB data processing unit receives data output from the cache unit, the data are processed, a data stream, a latch signal and a clock signal are transmitted out, a driving unit receives the data stream, the latch signal and the clock signal output from the RGB data processing unit, the data stream, the latch signal and the clock signal are processed, a clock and a data read-in signal of a Mini-LED screen driving chip are generated, and finally display data can be spliced and displayed on a plurality of Mini-LED display screens.
Description
Technical Field
The embodiment of the invention relates to an LED display technology, in particular to a spliced display driving system and a drive display method for a Mini-LED display screen.
Background
Mini-LEDs are a new LED display technology derived from small-pitch LEDs, and are also called sub-millimeter light emitting diodes. The grain size of the LED is about 50 to 200 microns, which is between that of a traditional LED and a Micro LED, and has huge industrial development potential.
The Mini-LED backlight adopts a direct type LED backlight mode, so that the size of an LED crystal grain is greatly reduced. It has the advantages of adjustable regional brightness, high color rendering property, high contrast and the like. Meanwhile, the thin-wall solar cell module has the characteristics of thinner thickness, more electricity saving, flexibility and the like, and is more flexible to apply.
However, because of the cost factor, the Mini-LED can only have the size of 10mm × 10mm at present, and the large screen which can most embody the Mini-LED display technology is limited by the cost or the yield factor and is difficult to popularize and apply.
Based on the above, the application provides a spliced display driving system and a drive display method for a Mini-LED display screen to solve the problem of large-screen display of the Mini-LED.
Disclosure of Invention
The invention provides a spliced display driving system and a spliced display driving method for a Mini-LED display screen, which are used for realizing spliced display of display data on a plurality of Mini-LED display screens.
In a first aspect, an embodiment of the present invention provides a Mini-LED display screen splicing display driving system, including: a storage module, a control module and a Mini-LED display module,
the storage module is used for providing display data;
the control module is used for processing the display data into a display signal and sending the display signal to the Mini-LED display module;
and the Mini-LED display module receives the display signal to control the display of the Mini-LED display screen.
Optionally, the control module includes a display data processing unit, a buffer unit, an RGB data processing unit, and a display module driving unit;
the display data processing unit is used for reading display data from the storage module and transmitting the read data and addresses to the cache unit;
the buffer unit is used for writing the continuous data stream transmitted by the display data processing unit into the buffer unit for buffering and outputting data;
the RGB data processing unit receives the data output from the buffer unit, performs logic processing on the data, and transmits a data stream, a latch signal and a clock signal;
the display module driving unit is used for generating clock and data read-in signals required by the display module to drive display.
Optionally, the Mini-LED display module is formed by splicing a plurality of Mini-LED display units, and the number of Mini-LED display units is multiple.
Optionally, the display device further comprises a brightness adjusting unit, wherein the brightness adjusting unit is used for performing bit expansion on the 16-bit color data output from the buffer unit according to the requirements of the display module driving unit, and realizing a brightness adjusting function.
Optionally, the display device further comprises a selection unit, and the selection unit is configured to process and output the data signal and the RGB signal transmitted by the driving unit.
Optionally, the system further comprises a clock signal adjusting unit, wherein the clock signal adjusting unit is configured to divide the frequency of the external clock and transmit the divided frequency to different units in the control module.
In a second aspect, an embodiment of the present invention further provides a method for driving and displaying a Mini-LED display screen, including:
the display data processing unit reads the display data from the SD card and transmits the read data and the address to the cache unit;
the buffer unit writes the continuous data stream transmitted by the display data processing unit into a buffer and outputs the data stream in another channel;
the RGB data processing unit receives the data output from the buffer unit, performs logic processing on the data, and transmits a data stream, a latch signal and a clock signal;
the driving unit receives and processes the data stream, the latching signal and the clock signal output by the RGB data processing unit to generate a clock and a data read-in signal of a Mini-LED screen driving chip;
and the Mini-LED display module receives a clock and a data read-in signal display of the Mini-LED screen driving chip.
Optionally, the Mini-LED display module is formed by splicing a plurality of Mini-LED display units, and the number of Mini-LED display units is multiple.
Optionally, the method further includes:
the brightness adjusting unit receives the brightness adjusting signal, carries out bit expansion on the 16bit color data output from the cache unit according to the requirement of the display module driving unit, and realizes the brightness adjusting function.
Optionally, the method further includes: and the RGB data processing unit traverses the address position of each pixel point of the Mini-LED display module through a register and transmits RGB data to the corresponding address.
The embodiment of the invention discloses a spliced display driving system and a spliced display driving method for a Mini-LED display screen. The method comprises the steps that display data are read from a storage module through a display data processing unit, the read data and addresses are transmitted to a cache unit, an RGB data processing unit receives data output from the cache unit, the data are processed, a data stream, a latch signal and a clock signal are transmitted out, a driving unit receives the data stream, the latch signal and the clock signal output from the RGB data processing unit, the data stream, the latch signal and the clock signal are processed, a clock and a data read-in signal of a Mini-LED screen driving chip are generated, and finally display data can be spliced and displayed on a plurality of Mini-LED display screens.
Drawings
Fig. 1 is a schematic structural diagram of a Mini-LED display screen splicing display driving system in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control module according to a first embodiment of the present invention.
Fig. 3 is a flowchart of an SPI communication transmission protocol in the first embodiment of the present invention.
FIG. 4 is a flowchart illustrating a display data reading process according to an embodiment of the invention.
Fig. 5 is a flowchart of an instruction for implementing different states of the driving unit by the state machine according to the first embodiment of the present invention.
Fig. 6 is a flowchart of a Mini-LED panel driving display method according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first module may be termed a second module, and, similarly, a second module may be termed a first module, without departing from the scope of the present application. The first module and the second module are both modules, but they are not the same module. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is a schematic structural diagram of a Mini-LED display screen splicing display driving system provided in an embodiment of the present application, including: the Mini-LED display device comprises a storage module 1, a control module 2 and a Mini-LED display module 3, wherein the storage module 1 is used for providing display data, the control module 2 is used for processing the display data into display signals and sending the display signals to the Mini-LED display module 3, the Mini-LED display module 3 receives the display signals to control the Mini-LED display screen to display, the Mini-LED display module 3 is formed by splicing two or three Mini-LED display units, specifically, the display units are Mini-LED display screens with the resolution ratio of 135 x 120, the LED chips are 100 micrometers, and the spacing size between the LED chips is 680 micrometers.
In this embodiment, the storage module 1 may be a memory card, preferably a micro SD card, and the embodiment uses the micro SD card, which is more favorable for saving space. Specifically, the memory module 1 further comprises a random access memory SDRAM, the SDRAM is based on a dual bank structure, when the control module 2 accesses data from one bank, the other bank is ready for reading and writing data, so that the reading efficiency is improved exponentially, the random access memory SDRAM is synchronized by a clock signal, and simultaneously a data switching area can be formed, and ping-pong logic is adopted to enable reading and writing to be performed simultaneously, thereby ensuring high-speed data transmission.
In the present embodiment, as shown in fig. 2, the control module 2 includes a display data processing unit 21, a buffer unit 22, a brightness adjusting unit 23, an RGB data processing unit 24, a selecting unit 25, a clock signal adjusting unit 26, and a display module driving unit 27.
Specifically, the display data stored in the storage module 1 in this embodiment may be pictures or videos, and since videos are more complicated than display processing of pictures, the storage module 1 in this application exemplarily illustrates this embodiment by storing eight different video files. The display data processing unit 21 is configured to read the eight different video files from the storage module 1, and transmit the read data and addresses to the buffer unit 22. Specifically, the video file format stored in the storage module 1 is a.bin binary file format, and the display data participating in calculation in the storage module 1 is stored in a binary format-free format because the binary file is more quickly stored. The resolution of the video file stored in the storage module 1 is cut according to the resolution required by the display module, for example, when two Mini-LED screens are spliced, the resolution of the video file in the storage module 1 is cut to 135 × 240; when the three Mini-LED screens are spliced, the resolution of the video file in the storage module 1 is cut to 135 multiplied by 360; when the six Mini-LED screens are spliced, the resolution of the video file in the storage module 1 is cut to 135 multiplied by 720; when the eight Mini-LED screens are tiled, the resolution of the video file in storage module 1 is clipped to 135 x 960.
As shown in fig. 3 and 4, the display data processing unit 21 reads the display data from the memory card by using the SPI communication transmission protocol (the reading of the display data is controlled according to the SWITCH unit SWITCH), and transmits the read data and the address to the cache module.
Specifically, the display data processing unit 21 includes the following signal ports: RSTN, CLK, SW, SD _ CLK, SD _ CS, SD _ DATAIN, SD _ DATAOUT, BTON. The RSTN signal port is used for low level reset, the CLK signal port is used for adjusting the control module 2 clock and frequency, in detail, 50 MHz; the SW signal port is used for the synchronized switch signal and switching the display data file; the SD _ CLK signal port acts as a clock signal to the SD Card, in detail, at a frequency of 50 MHz; the SD _ CS signal port is used as a chip select signal sent to the SD Card, and in detail, the signal is low and effective; the SD _ DATAIN signal port is used for writing data signals of the SD card, the SD _ DATAOUT signal port is used for reading data signals of the SD card, and the BTON signal port is used for receiving control signals of keys of a remote controller. The cache unit 22 may be a RAM, and is mainly used for implementing caching of read data of the SD card by calling resources of the cache unit 22 in the control module 2. By implementing buffering of 135 × 240 resolution pictures per frame by the buffer unit 22, stable transmission of data can be ensured. The advantage of invoking the buffer unit 22 in the control module 2 is to ensure more stable data transmission and more guaranteed timing control.
In this embodiment, two, three, six, and eight tiled display units are taken as an example for explanation, and in one embodiment, when the driving system is to process tiled display of two Mini-LED panels, the display module includes a first display module and a second display module. The number of the buffer units 22 is 32, and each RAM has a maximum capacity of 18 Kb. Each RAM has a maximum capacity of 18Kb to store video data of 135 x 240 resolution, 16 bits color, and 512Kb per frame. The buffer unit 22 is configured to write the continuous data stream sent by the display data processing unit 21 into the buffer unit 22 for buffering, and output the data stream in another channel; the continuous data stream and the output data stream are video data with a resolution of 135 x 240, a size of 512Kb per frame and a color of 16 bits. Further, after the display data is read from the SD card, the data addresses of all the pixels with the resolution of 135 × 240 in one frame are segmented according to the 135 × 30 module and stored in the 8 buffer units 22, respectively. The data of the first 4 buffer units 22 are output to the first display module for display, and the data of the last 4 buffer units 22 are output to the second display module for display.
In another embodiment, when the driving system is to process a tiled display of three Mini-LED panels, the display modules include a first display module, a second display module and a third display module. The number of the buffer units 22 is 48, and each RAM has the maximum capacity of 18 Kb. Each RAM has a maximum capacity of 18Kb to store video data having a resolution of 135 x 360, a color of 16 bits, and a size of 768Kb per frame. The buffer unit 22 is configured to write the continuous data stream sent by the display data processing unit 21 into the buffer unit 22 for buffering, and output the data stream in another channel; the continuous data stream and the output data stream are video data with the resolution of 135 x 360, the size of 768Kb per frame and the color of 16 bits. Further, after the display data is read from the SD card, the data addresses of all the pixels with 135 × 360 resolution of one frame are segmented according to 135 × 30 modules and stored in the 12 buffer units 22, respectively. The data of the first 4 buffer units 22 are output to the first display module for display, the data of the middle 4 buffer units 22 are output to the second display module for display, and the data of the last 4 buffer units 22 are output to the third display module for display.
In another embodiment, when the drive system is to handle a tiled display of six Mini-LED panels, the display modules include the first display module, the second display module …, and the sixth display module. The number of the buffer units 22 is 96, and each RAM has the maximum capacity of 18 Kb. Each RAM has a maximum capacity of 18Kb to store 1536Kb of video data per frame, with a resolution of 135 x 720, and a color of 16 bits. The buffer unit 22 is configured to write the continuous data stream sent by the display data processing unit 21 into the buffer unit 22 for buffering, and output the data stream in another channel; the continuous data stream and the output data stream are video data with a resolution of 135 x 720, a size of 1536Kb per frame, and a color of 16 bits. Further, after the display data is read from the SD card, the data addresses of all the pixels with 135 × 720 resolution of one frame are segmented according to 135 × 30 modules and stored in the buffer units 22, respectively. The data of the first 4 buffer units 22 are output to the first display module for displaying …, and the data of the second 4 buffer units 22 are output to the sixth display module for displaying.
In another embodiment, when the drive system is to handle a tiled display of eight Mini-LED panels, the display modules include the first display module, the second display module …, and the eighth display module. The number of the buffer units 22 is 128, and each RAM has a maximum capacity of 18 Kb. Each RAM has a maximum capacity of 18Kb to store 2048Kb of video data per frame with a resolution of 135 x 960 and a color of 16 bits. The buffer unit 22 is configured to write the continuous data stream sent by the display data processing unit 21 into the buffer unit 22 for buffering, and output the data stream in another channel; the continuous data stream and the output data stream are video data with a resolution of 135 x 9600, a size of 2048Kb per frame and a color of 16 bit. Further, after the display data is read from the SD card, the data addresses of all the pixels with 135 × 960 resolution of one frame are divided according to 135 × 30 modules and stored in the buffer units 22, respectively. The data of the first 4 buffer units 22 are output to the first display module for displaying …, and the data of the second 4 buffer units 22 are output to the eighth display module for displaying.
Specifically, the buffer unit 22 includes the following signal ports: a CLKA signal port for receiving a clock signal of RAMA, the clock signal having a frequency of 10 MHz; a CLKB signal port for receiving a clock signal of RAMB, the clock signal having a frequency of 10 MHz; an ADDRA signal port for receiving read data signal addresses from the RGB data processing unit 24; an ADDRB signal port for receiving a data signal storage address sent by the display data processing unit 21; a DIB signal port for receiving 8bit data read by the SD card; a RST signal port for receiving reset and low level reset; and a DOA signal port for receiving the address of the ADDRA from the RGB data processing unit 24, and reading the 16-bit data DOA corresponding to the address to output.
Specifically, the brightness adjusting unit 23 is configured to perform bit expansion on the 16-bit color data output from the buffer unit 22 according to the requirement of the display module driving unit 27, and implement a brightness adjusting function.
The brightness adjusting unit 23 is mainly configured to detect an input key signal and switch the brightness state by using a state machine according to the key signal. In the input signal inc is the signal for increasing the brightness level and dec is the signal for decreasing the brightness level.
The input condition of the inc, dec signals is detected at each rising edge of the CLK clock. When the key signal is detected to be active (inc, dec are active high), the brightness state adj _ state is changed. When the inc signal is high, the brightness is raised to the previous state. When the dec signal is high, the magnitude decreases to the next state. When the key valid signal is not detected, the brightness is kept in the current state.
The main logic for luminance change is to shift the d _ o [47:0] RGB data bits forward, shifting the R, G, B data bits forward by one bit, respectively, to increase luminance by one level. By shifting the data bits back by one bit, the luminance data is reduced by one level. And switching the brightness level by using the state machine to realize the change of the brightness.
In this embodiment, the brightness adjusting unit 23 includes the following signal ports: IR RX signal port, rstn signal port, DOA signal port, Inc signal port, dec signal port, led indicator light signal port, and d o signal port.
The IR _ RX signal port is used for receiving a brightness control signal output by the infrared remote controller; the rstn signal port is used for receiving a reset signal, and particularly, the low level is effective; the DOA signal port is used for receiving an input data signal; the Inc signal port is used for receiving the key signals with the increased brightness levels, and the brightness of each signal is changed once; the dec signal port is used for receiving key signals for reducing the brightness level, each signal changing the brightness once; the led indicator light signal port scans the next line every time a pulse is output in a line scanning mode; the d _ o signal port is used for receiving the adjusted data signal and further increasing the bit width to 48 bits;
the RGB data processing unit 24 performs logic processing on RGB data, and sends out a data stream, a latch signal, and a clock.
The RGB data processing unit 24 transmits RGB data of each pixel of 135 × 240 or 135 × 360Mini-LED screen, and traverses an address position of each pixel through registers such as adr _ ic _ r, adr _ port _ r, adr _ line _ r, and transmits RGB data to a corresponding address.
Specifically, 135 × 240 pixels are divided into 8 135 × 30 pixel modules for parallel output control, 135 × 360 pixels are divided into 12 135 × 30 pixel modules for parallel output control, wherein each 135 × 30 pixel module is controlled by 9 display module driving units 27, and each display module driving unit 27 controls 15ports and 30 lines.
The RGB data processing unit 24 performs data transmission on 8 or 12 135 × 30 pixel modules in parallel, and reads RGB data for each pixel by using a clock CLK. The cnt _ r is used as a counter, the RGB data of each pixel point are output in series, and every time the cnt _ r is timed, the gs _ r [46:0] and the gs _ r [47] in the gs _ r [47:0] register are cascaded, namely, the last bit is placed into the first bit, and simultaneously, the data of the gs _ r [47] are read by each cn _ t. When cnt _ r is 47, all RGB data gs _ r of the pixel point are transmitted out, and then switching is performed to the next pixel point. This is continued until data of each point of each display module driving unit 27 is transmitted.
When cnt _ R is equal to 46, the address of the next pixel is transmitted to the buffer unit 22 as the ADDRA signal, and the buffer unit 22 transmits the corresponding RGB data signal GS _ R according to the address. And then transmitted to the RGB data processing unit 24 through the brightness adjusting unit 23 for reading, and so on in a cycle.
In this embodiment, every 9 display module driving units 27 finishes reading (adr _ ic _ r is 3' h0), the play _ r is pulled high, the data is latched, and then the reading of the data is continued.
In the present embodiment, the RGB data processing unit 24 includes the following signal ports: a D _ GS signal port for receiving the adjusted gray data signal of the corresponding display module; an RSTN signal port for receiving a reset signal; a CLK signal port for receiving a clock signal; an ADDRA signal port for receiving an address signal of a next frame data signal; a PLAT signal port for receiving a latch signal; a PCLK signal port for receiving a drive unit clock signal; a DA signal port for receiving the data signal of the first display module; a DB signal port for receiving the data signal of the second display module, and if the display is a three-screen splicing display, a DC signal port for receiving the data signal of the third display module,
the selection unit 25 is used for performing selection processing on the data signal and the RGB signal transmitted by the driving unit and outputting the data signal and the RGB signal.
The clock signal conditioning unit 26 is used to divide the frequency of the external clock and transmit it to different units in the control module 2. In this embodiment, each clock is associated with the triggering of an associated signal. The clock of each unit in the control module 2 is closely related to the instruction of the signal and the internal state. Regarding the clock of the output and input in the whole control module 2, the input CLK clock is the control module 2 clock, which is related to the signal transmission of the whole control module 2, because most of the control module 2 is a sequential circuit. The output clock DCLK is mainly a clock signal required by the display module driving unit 27, and controls signal transmission inside the driving unit.
In this embodiment, a Mini-LED full-color driving unit is used to address each LED chip, independently current-drive, and thereby display imaging. The display module driving unit 27 receives and processes the data stream, the latch signal and the clock signal output by the RGB data processing unit 24 to generate a clock and a data read-in signal of the Mini-LED panel driving chip.
The display module driving unit 27 mainly includes a data reading clock DCLK, a data reading signal SDI, a control module 2 reset signal rstn, a debugging signal FS and le (logic elements). The main logical idea implemented by the display module driving unit 27 is to generate a counter cnt _ r according to the DCLK clock, which implements the command requirements of the driving unit.
The cnt _ r timer is used to realize the pre-set control command, i.e. the write status register command needs to send out the pre-set control command of 14 clock DCLK rising edges of the LE packet. The status register is then used to store data into the register using cnt _ r.
In the driving unit, the instructions of different states of the driving unit are realized through a state machine, and the instruction flow is shown in fig. 5. The drive unit comprises 9 groups of 48-bit state buffers in total, wherein 3 groups are Global state buffers represented by Global-1, Global-2 and Global-3, the other 6 groups are local state buffers represented by R-1, R-2, G-1, G-2, B-1 and B-2, and each group of state buffers is divided into 3 16-bit state buffers.
In the present embodiment, the display module driving unit 27 includes the following signal ports: a DCLK signal port for receiving a data read clock signal; an SDI signal port for receiving a data read signal; an RSTN signal port for receiving a reset signal; an FS signal port for receiving debug signals and le (logic elements).
In this embodiment, the display device further includes an infrared receiving module, where the infrared receiving module is configured to receive a remote control signal sent by an infrared remote controller, and transmit the signal to the display data processing unit 21 and the brightness adjusting unit 23.
In this embodiment, the infrared receiving module receives a signal sent by the remote controller, and transmits the signal to the display data processing unit 21 and the brightness adjusting unit 23. The system comprises three signal ports, an IR _ RX signal port and an infrared receiving signal; a Bton1 signal port and a video switching function; bton2 signal port, brightness adjustment signal. The infrared receiving module uses 3.3V working voltage and can receive remote control of 8-10 meters of an infrared remote controller.
Specifically, the display module is remotely controlled through remote control of the infrared remote controller, the infrared receiving module receives a remote control signal sent by the infrared remote controller and sends the remote control signal to the control module 2 through the serial communication interface, and the control module 2 debugs display parameters, such as brightness, chromaticity and the like, of the Mini-LED display screen through the display module driving unit 27 after processing the remote control signal.
In this embodiment, the number of the keyboards of the infrared remote controller may be at least 16, the LED indicator includes 6 adjustment position indicator lights and an infrared emission signal indicator light, the keyboard includes 10 program keys "0-9", and 6 function keys of confirmation, instruction position, + key, -key, pause and reset, the keys 0-9 can play corresponding files, the keys + can increase the play speed, the keys-can reduce the play speed, and after the pause key is pressed, the pause key is pressed again to continue.
According to the technical scheme, the Mini-LED display screen splicing display driving system comprises the infrared receiving module for receiving the remote control signal sent by the infrared remote controller, so that the problem of complex debugging of the display screen is solved, and the effect of remote and simple debugging is achieved.
In this embodiment, the present embodiment further includes a switch module, and the switch module is used to control the display data processing unit 21 to selectively read the display data in the storage module 1. Different functions are realized by adjusting the switch module, and the running state and the effective realization of the adjusting result are displayed by the arranged LED indicating lamp. The switch module comprises a switch unit (switch) and a button unit (button), the switch unit is used for switching and selecting the display data in the storage module 1, the button unit adjusts the brightness of the display module in three levels and comprises a first button unit and a second button unit, and the first button unit adjusts the three brightness levels, triggers the first button unit once and improves the first brightness level until the highest brightness level is reached; and the second button unit is used for adjusting three brightness levels, triggering once and reducing one level until the lowest brightness level is reached.
In detail, in the present embodiment, the brightness adjustment function of the brightness adjustment unit 23 is implemented by an infrared remote controller, and the main method for implementing the brightness adjustment function of the brightness adjustment unit 23 is to detect an input key signal and implement the switching of the brightness state by using a state machine according to the key signal.
The embodiment of the invention discloses a Mini-LED display screen splicing display driving system, which is characterized in that a signal is transmitted to a Mini-LED driving chip by reading and processing display data in a storage module, and finally the display data can be spliced and displayed on a plurality of Mini-LED display screens, so that the problem of large-screen display of the Mini-LED is solved.
Example two
The embodiment further provides a driving display method for splicing and displaying two, three, six and eight Mini-LED panels, as shown in fig. 6, which includes the following steps:
s100, the display data processing unit reads the display data from the SD card and transmits the read data and the address to the buffer unit.
In the present embodiment, the reading of the display data is controlled according to SWITCH, and the SPI operating mode (SD _ CS signal is active low) is enabled for signal gating, and the flow charts are shown in fig. 3 and 4. The main logic is to use a STATE machine to perform each of the operating STATEs in SPI mode, including initialization (STATE _ SPI _ init), null STATE (STATE _ SPI _ idle), Transmit (STATE _ SPI _ tx), Transmit 1(STATE _ SPI _ tx1), and Transmit 2(STATE _ SPI _ tx 2). And sending a state, wherein each clock rising edge receives 1-bit data, and at least 8 clocks are needed for transmitting 8-bit data.
And secondly, reading data according to the command CMD requirement according to the transmission mode of the SD card. Specifically, the video file format stored in the SD card is a bin binary file format, and the display data participating in calculation in the SD card is stored in a binary format-free format because the binary file is more quickly stored. The resolution of the video file stored in the SD card is cut according to the resolution required by the display of the display module, for example, when two Mini-LED screens are spliced for display, the resolution of the video file in the storage module is cut to 135 x 240; when three Mini-LED screens are spliced and displayed, the resolution of a video file in the storage module is cut to 135 multiplied by 360; the final display resolution is determined by the resolution required for display by the display module.
S200, the cache unit writes the continuous data stream transmitted by the display data processing unit into the cache and outputs the data stream in another channel.
In this embodiment, when two tiled screens are used, after the display data is read from the SD card, the data addresses of all the pixels with the resolution of 135 × 240 in one frame are divided according to the 135 × 30 module and stored in 8 buffer units respectively. The data of the first 4 cache units are output to a first display module for display, and the data of the last 4 cache units are output to a second display module for display; the cache unit may be an RAM, and is mainly used for implementing the cache of the data read by the SD card by calling the resources of the cache unit in the control module. The continuous data stream and the output data stream are video data with a resolution of 135 x 240, a size of 512Kb per frame and a color of 16 bits.
In this embodiment, when there are three tiled screens, after the display data is read from the SD card, the data addresses of all pixels with 135 × 360 resolution of one frame are divided according to 135 × 30 modules and stored in 12 buffer units, respectively. The data of the first 4 cache units are output to a first display module for display, the data of the middle 4 cache units are output to a second display module for display, and the data of the last 4 cache units are output to a third display module for display; the cache unit may be an RAM, and is mainly used for implementing the cache of the data read by the SD card by calling the resources of the cache unit in the control module. The continuous data stream and the output data stream are video data with the resolution of 135 x 360, the size of 768Kb per frame and the color of 16 bits.
In this embodiment, when there are six tiled screens, after the display data is read from the SD card, the data addresses of all pixels with 135 × 720 resolution of one frame are divided according to 135 × 30 modules and stored in 24 buffer units, respectively. The data of the first 4 cache units are output to a first display module for displaying …, and the data of the second 4 cache units are output to a sixth display module for displaying; the cache unit may be an RAM, and is mainly used for implementing the cache of the data read by the SD card by calling the resources of the cache unit in the control module. The continuous data stream and the output data stream are video data with a resolution of 135 x 720, a size of 1536Kb per frame, and a color of 16 bits.
In this embodiment, when the number of the tiled display screens is eight, after the display data is read from the SD card, the data addresses of all the pixels with the resolution of 135 × 960 in one frame are divided according to the 135 × 30 module and stored in the 32 buffer units respectively. The data of the first 4 cache units are output to the first display module to be displayed …, and the data of the second 4 cache units are output to the eighth display module to be displayed; the cache unit may be an RAM, and is mainly used for implementing the cache of the data read by the SD card by calling the resources of the cache unit in the control module. The continuous data stream and the output data stream are video data with a resolution of 135 x 960, a size of 2048Kb per frame and a color of 16 bit.
S300, the RGB data processing unit receives the data output from the buffer unit, performs logic processing on the data, and transmits a data stream, a latch signal and a clock signal.
Specifically, the RGB data processing unit transmits RGB data of each pixel point of the Mini-LED 135 × 240 screen. And traversing the address position of each pixel point through registers such as adr _ ic _ r, adr _ port _ r and adr _ line _ r, and transmitting RGB data to the corresponding address. The 135 x 240 pixel points are divided into 8 135 x 30 pixel point modules for parallel output control; each 135 × 30 is controlled by 9 display module driving units, and each display module driving unit controls 15ports and 30 lines; the RGB data processing unit is realized by carrying out data transmission on 8 135 x 30 pixel modules in parallel and reading RGB data of each pixel through a clock CLK. The cnt _ r is used as a counter, the RGB data of each pixel point are output in series, and every time the cnt _ r is timed, the gs _ r [46:0] and the gs _ r [47] in the gs _ r [47:0] register are cascaded, namely, the last bit is placed into the first bit, and simultaneously, the data of the gs _ r [47] are read by each cn _ t. When cnt _ r is 47, all RGB data gs _ r of the pixel point are transmitted out, and then switching is performed to the next pixel point. The process is continued until the data of each point of each display module driving unit is transmitted.
Specifically, the RGB data processing unit transmits RGB data of each pixel point of the Mini-LED 135 × 360 screen. And traversing the address position of each pixel point through registers such as adr _ ic _ r, adr _ port _ r and adr _ line _ r, and transmitting RGB data to the corresponding address. 135 × 360 pixel points are divided into 12 135 × 30 pixel point modules for parallel output control; each of the above 135 × 30 is controlled by 9 display module driving units, and each display module driving unit controls 15ports and 30 lines. The RGB data processing unit is realized by carrying out data transmission on 12 135 x 30 pixel modules in parallel and reading RGB data of each pixel through a clock CLK. The cnt _ r is used as a counter, the RGB data of each pixel point are output in series, and every time the cnt _ r is timed, the gs _ r [46:0] and the gs _ r [47] in the gs _ r [47:0] register are cascaded, namely, the last bit is placed into the first bit, and simultaneously, the data of the gs _ r [47] are read by each cn _ t. When cnt _ r is 47, all RGB data gs _ r of the pixel point are transmitted out, and then switching is performed to the next pixel point. The process is continued until the data of each point of each display module driving unit is transmitted.
When cnt _ R is equal to 46, the address of the next pixel is transmitted to the buffer unit as the ADDRA signal, and the buffer unit transmits the corresponding RGB data signal GS _ R according to the address. And then the light is transmitted to the RGB data processing unit for reading through the brightness adjusting unit, and the process is repeated in a circulating way.
Further, when the display module driving unit finishes reading every 9 display module driving units (adr _ ic _ r is 3' h0), the play _ r is pulled high, the data is latched, and then the reading of the data is continued.
And S400, receiving and processing the data stream, the latch signal and the clock signal output by the RGB data processing unit by the driving unit to generate a clock and a data read-in signal of the Mini-LED screen driving chip.
Specifically, the full-color driving unit addresses each LED chip, independently current-drives, and thereby displays an image. One Mini-LED display screen has 36 driving units, and one driving unit can control 512 pixels.
The display module driving unit mainly includes a data reading clock DCLK, a data reading signal SDI, a control module reset signal rstn, a debugging signal FS and le (logic elements). The main logic idea of the display module driving unit is to generate a counter cnt _ r according to the DCLK clock, and the counter realizes the command requirement of the driving unit.
The cnt _ r timer is used to realize the pre-set control command, i.e. the write status register command needs to send out the pre-set control command of 14 clock DCLK rising edges of the LE packet. The status register is then used to store data into the register using cnt _ r.
In the driving unit, the instructions of different states of the driving unit are realized through a state machine, and the instruction flow is shown in fig. 5. The drive unit comprises 9 groups of 48-bit state buffers in total, wherein 3 groups are Global state buffers represented by Global-1, Global-2 and Global-3, the other 6 groups are local state buffers represented by R-1, R-2, G-1, G-2, B-1 and B-2, and each group of state buffers is divided into 3 16-bit state buffers.
Further, the display module driving unit includes the following: a control module clock CLK port with a frequency of 10 MHZ; an RSTN port for low level reset; the SDI port of the data read signal is a DCLK port of the data read clock, an FS port of the debug signal, and an le (logic elements) port. The logic of the signal formation needs to follow the control instruction requirements specified by the drive unit.
And S500, the Mini-LED display module receives the clock of the Mini-LED screen driving chip and displays the data reading signal.
Further, the driving display method includes:
and S600, the brightness adjusting unit receives the brightness adjusting signal, performs bit expansion on the 16-bit color data output from the cache unit according to the requirement of the display module driving unit, and realizes the brightness adjusting function.
Specifically, the brightness adjusting unit detects an input key signal, and switches the brightness state by using a state machine according to the key signal. In the input signal inc is the signal for increasing the brightness level and dec is the signal for decreasing the brightness level.
And S700, the selection unit performs selection processing on the data signal and the RGB signal transmitted by the driving unit and outputs the data signal and the RGB signal.
And S800, the clock signal adjusting unit divides the frequency of the external clock and transmits the frequency divided frequency to different units in the control module.
In particular, each clock is associated with the triggering of an associated signal. The clock of each unit in the control module is closely related to the instruction of the signal and the internal state. For the clock of the output and the input in the whole control module, the input CLK clock is the control module clock, and is related to the signal transmission of the whole control module, because most of the control module is a sequential circuit. The output clock DCLK is mainly a clock signal required by the driving unit of the display module and controls the signal transmission inside the driving unit.
The embodiment discloses a spliced display driving display method for a Mini-LED display screen, which comprises the steps of reading display data from a storage module through a display data processing unit, transmitting the read data and addresses to a cache unit, receiving the data output from the cache unit by an RGB data processing unit, processing the data, transmitting a data stream, a latch signal and a clock signal, receiving the data stream, the latch signal and the clock signal output from the RGB data processing unit by a driving unit, processing the data stream, the latch signal and the clock signal, generating a clock and a data read-in signal of a Mini-LED screen driving chip, and finally enabling the display data to be spliced and displayed on a plurality of Mini-LED display screens.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A Mini-LED display screen splicing display driving system is characterized by comprising: a storage module, a control module and a Mini-LED display module,
the storage module is used for providing display data;
the control module is used for processing the display data into a display signal and sending the display signal to the Mini-LED display module;
and the Mini-LED display module receives the display signal to control the display of the Mini-LED display screen.
2. The Mini-LED display screen splicing display driving system according to claim 1, wherein the control module comprises a display data processing unit, a cache unit, an RGB data processing unit and a display module driving unit;
the display data processing unit is used for reading display data from the storage module and transmitting the read data and addresses to the cache unit;
the buffer unit is used for writing the continuous data stream transmitted by the display data processing unit into the buffer unit for buffering and outputting data;
the RGB data processing unit receives the data output from the buffer unit, performs logic processing on the data, and transmits a data stream, a latch signal and a clock signal;
the display module driving unit is used for generating clock and data read-in signals required by the display module to drive display.
3. The spliced display driving system for a Mini-LED display screen according to claim 2, wherein the Mini-LED display module is formed by splicing a plurality of Mini-LED display units.
4. The Mini-LED display screen splicing display driving system according to any one of claim 2, further comprising a brightness adjusting unit, wherein the brightness adjusting unit is used for carrying out bit expansion on the 16-bit color data output from the cache unit according to the requirements of the display module driving unit and realizing a brightness adjusting function.
5. The Mini-LED display screen splicing display driving system according to any one of claim 2, further comprising a selection unit, wherein the selection unit is used for processing and outputting the data signals and the RGB signals transmitted by the driving unit.
6. The Mini-LED display screen splicing display driving system according to any one of claim 2, further comprising a clock signal adjusting unit, wherein the clock signal adjusting unit is used for dividing the frequency of an external clock and transmitting the divided frequency to different units in the control module.
7. A Mini-LED display screen driving display method is characterized by comprising the following steps:
the display data processing unit reads the display data from the SD card and transmits the read data and the address to the cache unit;
the buffer unit writes the continuous data stream transmitted by the display data processing unit into a buffer and outputs the data stream in another channel;
the RGB data processing unit receives the data output from the buffer unit, performs logic processing on the data, and transmits a data stream, a latch signal and a clock signal;
the driving unit receives and processes the data stream, the latching signal and the clock signal output by the RGB data processing unit to generate a clock and a data read-in signal of a Mini-LED screen driving chip;
and the Mini-LED display module receives a clock and a data read-in signal display of the Mini-LED screen driving chip.
8. The spliced display driving system for a Mini-LED display screen according to claim 7, wherein the Mini-LED display module is formed by splicing a plurality of Mini-LED display units.
9. The method of driving a display according to claim 7, further comprising:
the brightness adjusting unit receives the brightness adjusting signal, carries out bit expansion on the 16bit color data output from the cache unit according to the requirement of the display module driving unit, and realizes the brightness adjusting function.
10. The method of driving a display according to claim 1, further comprising: and the RGB data processing unit traverses the address position of each pixel point of the Mini-LED display module through a register and transmits RGB data to the corresponding address.
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