CN201570228U - LED dot matrix display board - Google Patents

Abstract

The utility model provides an LED dot matrix display board which comprises a control part of a single chip microcomputer and a display driving part connected with the control part of the single chip microcomputer, wherein the control part of the single chip microcomputer comprises a single chip microcomputer, a data memory, a latch and an interface chip; the display driving part consists of a line scanning signal shift register, a column dot matrix data shift register, a decoder, a line driving circuit and 28 pieces of 8*8 LED dot matrix modules; an output end of the line scanning signal shift register is connected with an input end of the column dot matrix data shift register; an output end of the column dot matrix data shift register is connected with input ends of the 8*8 LED dot matrix modules; the output end of the line scanning signal shift register is connected with an input end of the decoder; an output end of the decoder is connected with an input end of the line driving circuit; and an output end of the line driving circuit is connected with the input ends of the 8*8 LED dot matrix modules. The LED dot matrix display board has the benefits of having simple display principle and low cost, and realizing dynamic shifting display of any multiple characters.

Description

LED dot matrix display board

technical field

The utility model belongs to the field of display technology, in particular to an LED dot matrix display board.

Background technique

LED dot matrix display boards are widely used in public places and other places to display Chinese characters, characters and image information. The principle of LED dot matrix display is that in the PN junction of some semiconductor materials, when the injected minority carriers recombine with the majority carriers, the excess energy will be released in the form of light, thereby directly converting electrical energy into light. able. When a reverse voltage is applied to the PN junction, it is difficult for minority carriers to inject, so it does not emit light. The luminous color and luminous efficiency of LED are related to the material and process of making LED. At present, red, green and blue are widely used. Due to the low working voltage of the LED (only 1.5-3V), it can actively emit light and have a certain brightness, and the brightness can be adjusted by voltage (or current), and it is shock-resistant, vibration-resistant, and has a long life (100,000 hours). Among the display devices, there is currently no other display method that rivals the LED display method. A display made by putting red and green LEDs together as a pixel is called a dual-primary color screen or a pseudo-color screen; a display that puts red, green, and blue LED tubes together as a pixel is called a tri-primary color screen or full color screen. The pixel size of indoor LED screens is generally 2-10 mm, and several LED dies that can produce different primary colors are often packaged into one body. The pixel size of outdoor LED screens is mostly 12-26 mm, and each pixel is composed of several Composed of various monochromatic LEDs, common finished products are called pixel tubes or pixel modules. If the LED display screen wants to display images, the luminance of each LED that constitutes the pixel must be adjustable, and the fineness of the adjustment is the gray level of the display screen. The higher the gray level, the more delicate the image displayed, the richer the color, and the more complex the corresponding display control system. At the current technical level, the color transition of the 256-level grayscale image is very soft, and the image restoration effect is relatively satisfactory. However, the display principle of the LED dot matrix display board in the prior art is complicated and the cost is high.

Contents of the invention

The purpose of the utility model is to provide an LED dot matrix display board, which solves the disadvantages of complicated display principle and high cost in the prior art.

The technical solution adopted by the utility model is: an LED dot matrix display board, including a single-chip microcomputer control part and a display driving part connected thereto; the single-chip microcomputer control part includes a single-chip microcomputer, a data memory, a latch and an interface chip; The output end of the single-chip microcomputer is connected with the input end of the latch, the output end of the latch is connected with the input end of the data memory, and the output end of the single-chip microcomputer is connected with the input end of the data memory; Bit register, column dot matrix data shift register, decoder, row drive circuit and 28 pieces of 8×8 LED dot matrix modules; the output end of the row scanning signal shift register is connected to the input end of the column dot matrix data shift register, and the column The output end of the dot matrix data shift register is connected to the input end of the 8×8 LED dot matrix module, the output end of the row scanning signal shift register is connected to the input end of the decoder, and the output end of the decoder is connected to the input end of the row driving circuit , the output terminal of the row driving circuit is connected with the input terminal of the 8×8 LED dot matrix module.

The beneficial effect of the utility model is that the display principle is simple, the cost is low, and the dynamic shift display of any number of characters can be realized.

Description of drawings

Fig. 1 is a functional block diagram of the utility model single-chip microcomputer control part;

Fig. 2 is a functional block diagram of the display driving part of the utility model.

In the figure, 1. Interface chip, 2. Single-chip microcomputer, 3. Latch, 4. Data memory, 5. Line scan signal shift register, 6. Decoder, 7. Line drive circuit, 8.8×8 LED dot matrix module , 9. Column dot matrix data shift register.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The utility model discloses an LED dot matrix display board, which comprises a single-chip microcomputer control part and a display drive part connected thereto; as shown in Figure 1, the single-chip microcomputer control part comprises a single-chip microcomputer 2, a data memory 4, a latch 3 and an interface chip 1; the output end of the single-chip microcomputer 2 is connected with the input end of the latch 3, the output end of the latch 3 is connected with the input end of the data memory 4, and the output end of the single-chip microcomputer 2 is connected with the input end of the data memory 4. As shown in Figure 2, the display drive part is composed of row scan signal shift register 5, column dot matrix data shift register 9, decoder 6, row drive circuit 7 and 28 8×8 LED dot matrix modules 8; row scan The output end of the signal shift register 5 is connected to the input end of the column dot matrix data shift register 9, the output end of the column dot matrix data shift register 9 is connected to the input end of the 8×8 LED dot matrix module 8, and the row scanning signal shift register 5 outputs The end is connected with the input end of the decoder 6, the output end of the decoder 6 is connected with the input end of the row drive circuit 7, and the output end of the row drive circuit 7 is connected with the input end of the 8×8 LED dot matrix module 8.

The working principle of the utility model is that after the data is received correctly and processed and stored in the display buffer, the display of the display board is controlled. The display mode adopts a progressive scan mode, and the single-chip microcomputer 2 first takes the first point row data from the display buffer, outputs it to the data memory 4, and outputs it bit by bit in 8-bit parallel through the serial input and parallel output mode of the line scan signal shift register 5 At the same time, the data at the output end of the data memory 4 is also shifted into the serial output end bit by bit, and output from the serial output end to the data serial input end of the next display driver part. After a bit of row data is output to the parallel output end of column dot matrix data shift register 9, send 8 row scan signals to row scan signal shift register 5 by single-chip microcomputer 2 again, like this, row scan signal shift register 5 The output data is an 8-bit row scanning signal, and the data output by the column dot matrix data shift register 9 is dot matrix data of one point and one row. Then the single-chip microcomputer 2 sends the data latch signal, and the line scan signal is latched to the decoder 6, and the dot matrix data to be displayed is latched to the output terminal of the latch 3, thereby lighting up a row of LEDs on the display board, and delaying After a period of time, light up the next line in turn, which realizes the progressive scanning display of the display board.

Claims (1)

1. a LED dot matrix display board is characterized in that: comprise Single-chip Controlling part and the display driving part that is attached thereto; Described Single-chip Controlling partly comprises single-chip microcomputer (2), data-carrier store (4), latch (3) and interface chip (1); The output terminal of single-chip microcomputer (2) is connected with the input end of latch (3), and the output terminal of latch (3) is connected with the input end of data-carrier store (4), and the output terminal of single-chip microcomputer (2) is connected with the input end of data-carrier store (4); Described display driving part is made up of line scan signals shift register (5), row dot array data shift register (9), code translator (6), horizontal drive circuit (7) and 28 8 * 8LED lattice modules (8); Described line scan signals shift register (5) output terminal is connected with row dot array data shift register (9) input end, row dot array data shift register (9) output terminal is connected with 8 * 8LED lattice module (8) input end, line scan signals shift register (5) output terminal is connected with the input end of code translator (6), the output terminal of code translator (6) is connected with the input end of horizontal drive circuit (7), and the output terminal of horizontal drive circuit (7) is connected with the input end of 8 * 8LED lattice module (8).

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