With the process of urbanization accelerating, China's economy continued to rise in 2016. In order to meet the needs of the promotion of various industries, all the streets are all kinds of full-color LED display occupy, which also appeared a more concerned about the issue, then led the working principle of the display is how What about it?
Want to understand the working principle of the led display, we must first clear the led display a variety of signal to the direction, led display there are five kinds of signals, these five signals must be coordinated with the completion of data transmission, in order to complete the display The display work.
LED display by the data acquisition system, control system, and display system composed of three parts. Data signals for: peripherals - computer - DVI graphics - data transmission card - data receiving card - HUB adapter board - display.
The actual situation is, HUB adapter board as the last part of the data transmission, all the signals can be HUB adapter board to find. HUB adapter board is the signal generated by the control panel is divided into several tributaries of the card board, also known as the sub-line board. Under normal circumstances, according to the LED electronic screen itself, the number of longitudinal components determined.
The display contains a variety of signals. Signal from the HUB board, through the cable connected to the cell board or module, to complete the data transmission. In addition to the data signal is serial transmission, the other signals are parallel transmission. Now the various signal effects are analyzed as follows:
1. CLK clock signal:
A shift pulse is provided to the shift register, and each pulse causes the data to be shifted in or out of one bit. Data on the data port must be coordinated with the clock signal to normally transmit data, the frequency of the data signal must be 1/2 of the frequency of the clock signal. In any case, when the clock signal is abnormal, will make the whole board display chaotic.
2. STB latch signal:
When all the data transmission is completed, the STB latch signal is valid, the data in the shift register is latched, and its data content through the drive circuit to light up the LED display. However, since the drive circuit is controlled by the EN enable signal, its lighting condition must be enabled. The latch signal also needs to be coordinated with the clock signal to show the complete picture. In any case, when the latch signal is abnormal, will make the whole board display chaotic.
3. EN enable signal:
The entire screen brightness control signal is also used for display blanking. As long as the adjustment of its duty cycle can control the brightness changes. When the enable signal is abnormal, the entire screen will appear off, dark or smear and so on.
4. color data signal:
Provides the data needed to display the image. Must be coordinated with the clock signal to transfer the data to any of the display points. Usually in the display in the red, green and blue data signal separation, if a data signal short to the positive or negative, the corresponding color will appear full or not bright, when the data signal is floating when the corresponding color display The situation is uncertain.
5. ABCD line signal:
Only in the dynamic scan display exists, ABCD is a binary number, A is the lowest bit, if the binary control ABCD signal control the maximum range is 16 lines (0000-1111), 1/4 scan as long as the AB signal can be, Because the AB signal representation range is 4 lines (00-11). When the line control signal is abnormal, there will be dislocation, highlight or image overlap.
Shenzhen LightS Technology Co., Ltd. was founded in 2012, is a professional engaged in LED display, LED lighting product development, production, sales and service as one of the national high-tech private enterprises. Companies in the "build the world's first-class LED brand" business vision, is committed to providing customers with high-quality, high-performance LED applications and services!
We have various different kinds of LED display, including indoor, outdoor, mobile truck, floor standing kiosk, taxi top, curtain, window glass, unconventional LED display and so on.
Since the establishment of the LED display based on the prospective research and business strategy of the precise positioning of the company to achieve the product characteristics, market internationalization, business integration, professional services development pattern; with its unique competitive advantage, by the customer And the supplier's recognition and support, the rapid development of domestic LED applications into the field of leading enterprises.
Our team keep the "let the world Lights up" in mind ,business mission to professional cast quality, integrity to win the future, to become the leader of the times, "Made in China" Tim add color!