CN105741757A - High-refresh-rate 1/16 scanning P4 full-color LED display device and scanning method thereof - Google Patents

Abstract

The present invention relates to a high refresh rate 1/16 scanning P4 full-color LED display and its scanning method. The display includes a P4 unit board, a control board and a power supply module, each of the P4 unit boards and one of the control boards They are connected through connectors, one control board correspondingly controls one unit board to form a display control unit, and the signal transmission between P4 unit boards is realized through two gigabit network interfaces on the control board, and the connectors Connect with the power supply module to realize power supply. The beneficial effect is that the gray level of the display screen is increased while the refresh rate of the display screen is increased, so that the performance of the display screen is significantly improved, thereby obtaining a better display effect. And the data is transmitted through the network cable, which improves the data transmission efficiency. No separate power supply is required, which simplifies the operation in practical applications.

Description

High refresh rate 1/16 scanning P4 full-color LED display and scanning method

technical field

The invention relates to an LED display module, in particular to a P4 full-color LED display module with a high refresh rate of 1/16.

Background technique

LED (Light Emitting Diode) large-screen display system, as a new media playback tool, is a flat display screen composed of light-emitting diode dot matrix modules or pixel units. Since the late 1980s, with the continuous improvement of LED manufacturing technology, it has been widely used abroad. After my country's reform and opening up, especially in the 1990s, with the rapid growth of the national economy, the demand for information release in public places has become increasingly strong.

As a small-pitch indoor display, the P4 unit board has a wide range of applications. Due to the small spacing between pixels, the number of pixels per unit area is large, which has high requirements for the ability of the driving module. Taking the P4 unit board as an example, the driving mode of the traditional P4 unit board is shown in Figure 1. Generally speaking, if you want to increase the gray level of the display screen to make the display effect more delicate, the refresh rate will definitely decrease, and the overall display effect will not be improved. Therefore, when designing an LED display unit board, it is necessary to make a trade-off between the refresh rate and the gray level, so that its performance tends to be balanced.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the above prior art, to provide a high refresh rate 1/16 scan P4 full-color LED display and its scanning method, and to improve the refresh rate and gray level on the original basis at the same time, specifically by the following technical solutions accomplish:

The high refresh rate 1/16 scan P4 full-color LED display includes a P4 unit board, a control board and a power supply module, each of the P4 unit boards is connected to one of the control boards through a connector, and one control board The boards correspondingly control one unit board to form a display control unit, and the signal transmission between the P4 unit boards is realized through two gigabit network interfaces on the control board, and the connector is connected with the power supply module to realize power supply .

The further design of the high refresh rate 1/16 scan P4 full-color LED display module is that the P4 unit board receives the 8 groups of RGB column signals of the control board through the connector, and simultaneously performs 8 groups of RGB column signals The register operation produces a grayscale signal.

The further design of the high refresh rate 1/16 scan P4 full-color LED display module is that the connector is a pin-row female connector.

As above-mentioned high refresh rate 1/16 scanning P4 full-color LED display provides a kind of scanning method, described method comprises the following steps:

1) Convert the input 4-bit row control signal into a 16-bit row selection signal through a decoder;

2) Divide the 32-line P4 unit board into upper and lower half screens, each half screen has 16 lines, and the line selection signal is controlled by the latch to perform line scanning, and each line selection signal simultaneously scans two lines;

3) After a row selection signal completes the scanning of the corresponding row, a latch signal is generated to store the RGB signal formed by row scanning into the latch, so that the driver chip does not work;

4) After all the row selection signals complete the scanning of all rows, generate a field synchronous signal to make the driver chip enter the working state, and perform column driving to light up the LED through the driver chip according to the RGB signal in the latch.

A further design of the scanning method is that the control signal of each row in the step 1) is subjected to current amplification processing through the GS4953 chip.

A further design of the scanning method is that in the step 3), each half-screen is driven by 12 ICN2026 driver chips to achieve column driving.

A further design of the scanning method is that the decoder in the step 1) adopts a decoder composed of two 74HC138 cascaded.

The advantages of the present invention are as follows:

A high refresh rate 1/16 scan P4 full-color LED display provided by the present invention can improve the gray level of the display screen while increasing the refresh rate of the display screen, so that the performance of the display screen has been significantly improved, thereby obtaining better display effect. And the data is transmitted through the network cable, which improves the data transmission efficiency. In addition, the display does not need a separate power supply, which simplifies the operation in practical applications.

Description of drawings

Figure 1 is a schematic diagram of a traditional P4 unit board driver.

Fig. 2 is a schematic diagram of data transmission of the high refresh rate 1/16 scan P4 full-color LED display module of the present invention.

Fig. 3 is a schematic diagram of row and column control signals of the high refresh rate 1/16 scan P4 full-color LED display module of the present invention.

Fig. 4 is a schematic structural diagram of a high refresh rate 1/16 scan P4 full-color LED display module of the present invention.

detailed description

The solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

The high refresh rate 1/16 scan P4 full-color LED display in this embodiment is mainly composed of a P4 unit board, a control board and a power supply module. Each P4 unit board is connected to a control board through a connector, and a control board controls a unit board correspondingly to form a display control unit. The signals between the P4 unit boards are transmitted through two Gigabit network interface implementation, see Figure 2. The connector is connected with the power supply module to realize power supply. The connector in this embodiment is a pin and female connector.

Further, the P4 unit board of this embodiment receives 8 groups of RGB column signals of the control board through the connector, and generates a grayscale signal by simultaneously registering the 8 groups of RGB column signals. The P4 unit board is mainly composed of a row signal control module and a column signal control module. The row signal control module selects the row to be lit by decoding the row signal, and drives the selected row through the row current; the column signal control module registers the input RGB signal through the row when a row is selected, thereby generating It can control the column signal of all the lights in the row, and turn on the lights that need to be turned on.

A scan method is provided for the above-mentioned high refresh rate 1/16 scan P4 full-color LED display, which includes the following steps:

1) Convert the input 4-bit row control signal into a 16-bit row selection signal through a decoder;

2) Divide the 32-line P4 unit board into upper and lower half screens, each half screen has 16 lines, and the line selection signal is controlled by the latch to perform line scanning, and each line selection signal simultaneously scans two lines;

3) After a row selection signal completes the scanning of the corresponding row, a latch signal is generated to store the RGB signal formed by row scanning into the latch, so that the driver chip does not work;

4) After all the row selection signals complete the scanning of all rows, generate a field synchronous signal to make the driver chip enter the working state, and perform column driving to light up the LED through the driver chip according to the RGB signal in the latch.

In this embodiment, a unit board with a size of 128mm*256mmP4 is taken as an example, and the unit board includes 32*64 pixels. The implementation of the above-mentioned scanning method will be described below by dividing it into a data transmission mode, a driving mode and a scanning mode.

Data transmission method: Different from the traditional P4 full-color LED display module for data transmission through cables, the data transmission method of the new P4 full-color LED display module is divided into two parts: the data transmission between the control board and the unit board And the data transmission between the unit board and the unit board. The control board and the unit board are directly connected through the pin and female connectors, and the data is transmitted and common power supply is realized through the pin and female connectors. The data transmission between unit boards is realized through the Gigabit Ethernet port on the control board. There are two Gigabit Ethernet ports on the control board of each unit board, which are used to receive data and transmit data respectively. See the attached picture 2.

Driving mode: The LED unit board first scans the line synchronously. After scanning the first line, it does not display directly, but latches the information through the latch. After all the lines are scanned, it sends a field synchronous signal. At this time will be displayed on the LED unit board. The size of the P4 unit board is 64*32, that is, there are 32 rows and 64 columns. In this embodiment, two pieces of 74HC138 are cascaded to form a 4-16-bit decoder, and the input 4-bit row control signals A, B, C, and D are converted into 16-bit row selection signals to realize the 1/16 scan of the P4 unit board. Dynamic scanning. Since there are 64 pixels in each row, when the lights of a certain row need to be turned on at the same time, the required current is relatively large, so the control signal of each row needs to be amplified by the GS4953 chip. The P4 unit board has 32 rows and adopts 1/16 scan, so the unit board should be divided into upper and lower half screens, and each half screen has 16 rows for column driving. Each half-screen requires 12 pieces of ICN2026 to achieve column drive. When the display is driven, the row control signal selects a certain row, 4 pieces of ICN2026 receive 64-bit data at a time, and 12 pieces of ICN2026 in each half-screen can receive 64-bit R, G, B signals at a time. When the 64-bit data serial transmission ends, a latch signal is generated and the OE (enable) signal of ICN2026 is enabled, so that a row of lights that need to be lit is lit, see attached drawings 3 and 4.

Scanning method: The P4 unit board has 32 rows and 64 columns, and because it is a full-color display, each pixel has three light-emitting diodes R, G, and B, so when it is driven by two half-screens, 24 (4 *3*2) Only one ICN2026 chip can complete the column drive. Take the R signal of the above half screen as an example, the four ICN2026s share a clock signal CLK, latch the signal LAT, and enable the signal OE. Each ICN2026 receives an input signal respectively. Assume AR_1, AR_2, AR_3, AR_4. The control board transmits the AR signal through the connector, and the four-way AR data is serially shifted into the buffer of the ICN2026 under the control of CLK. In the 1/16 scanning mode, each row selection signal controls two rows at the same time, so the specific scanning method is: first input the D0 bit data of 64 pixels in the first row and the seventeenth row, and each row is 192 bits ( R, G, B each 64 bits). Since each monochromatic signal is serialized by 4 input signals at the same time, only 16 clock cycles are needed to complete the buffering of 64-bit data. After the input is completed, the latch signal LAT is valid, and ICN2026 outputs this group of signals at this time. Assuming that 8bit grayscale control is implemented, the following operations are performed while outputting: first, the FPGA logic controls the row selection signal to select the second row and the eighteenth row; second, the second row and the eighteenth row The D0-bit data is shifted into ICN2026, and then the above operation is repeated, the second row and the eighteenth row are output at the same time, the third row and the nineteenth row are selected, and the data shift input of the third row and the nineteenth row , until the display of D0 in the sixteenth and thirty-second lines is completed. At the same time as the data output of the sixteenth and thirty-second rows, the row control signal reselects the first row, and then starts to output the data of D1 from the first row, and so on until all the data D0 to D7 are output. Complete 8bit grayscale control. Due to the reduction of the time required for driving, a higher level of grayscale control can actually be adopted, and the display effect can be improved at the same refresh rate.

To sum up, the high refresh rate 1/16 scan P4 full-color LED display of this embodiment provided by the present invention can increase the refresh rate of the display screen while increasing its gray level, so that the performance of the display screen has been significantly improved. , so as to obtain a better display effect. And the data is transmitted through the network cable, which improves the data transmission efficiency. No separate power supply is required, which simplifies the operation in practical applications.

Claims (6)

1. one kind high refresh rate 1/16 sweeps P4 all-colour LED display, it is characterized in that, including P4 cell board, panel and supply module, connected by connector between every piece of described P4 cell board and a described panel, one panel respectively correspondingly controls a cell board and forms a display control unit, two gigabit networking interfaces that signal between P4 cell board passes through on panel realize, and described connector connects with described supply module, it is achieved power supply.

2. high refresh rate 1/16 according to claim 1 sweeps P4 all-colour LED display module, it is characterised in that described P4 cell board receives 8 groups of RGB column signals of panel by adapter, and produces grey scale signal by 8 groups of RGB column signals carry out registration operations simultaneously.

3. high refresh rate 1/16 according to claim 1 sweeps P4 all-colour LED display module, it is characterised in that described connector is pricking with needle row's female connectors.

High refresh rate 1/16 as described in claim 1-3 sweeps a kind of scan method of P4 all-colour LED display, it is characterised in that comprise the steps:

1) convert 4 row control signals of input to 16 row by decoder and select signal；

2) 32 row P4 cell boards being divided into upper and lower two half screens, every half screen is 16 row, controls row by latch and selects signal to enter line scans, and each row selects signal to carry out two row scannings simultaneously；

3), after a row selects the scanning that signal completes corresponding row, produce a latch signal and the rgb signal that row scanning is formed is stored in latch, make driving chip not work；

4) after all row select signal to complete the scanning of all row, produce a field sync signal and make driving chip enter duty, and enter Drive of row and column according to the rgb signal in latch by driving chip and light LED.

4. scan method according to claim 4, it is characterised in that in described step 1), the control signal of every a line carries out current amplifying process by GS4953 chip.

5. scan method according to claim 4, it is characterised in that in described step 3), every half screen realizes row driving by 12 ICN2026 type driving chip.

6. scan method according to claim 4, it is characterised in that decoder described in described step 1) adopts the decoder of two panels 74HC138 cascade composition.