LED full color display display principle and signal trend analysis
As the urbanization process continues to accelerate, the Chinese economy continues to rise in 2016. In order to meet the promotion needs of various industries, all the streets and alleys are occupied by a variety of full-color LED display screens, which also presents a problem that everyone is more concerned about, so how is the working principle of led display? What about it?
Want to understand the working principle of the led display, we must first understand the various signal directions of the led display, led display has five kinds of signals, these five kinds of signals must cooperate to complete the data transmission, in order to complete the display The display works. Leading editors will introduce the role of the five signals.
The LED display is made up of 3 parts: data acquisition system, control system and display system. The trend of data signals is peripheral computer - DVI graphics card - data sending card - data receiving card - HUB switch board - display screen.
The actual situation is that the HUB transfer board is the last link of data transmission. All the signals can be found in the HUB adapter board. The HUB switchboard is a card board that divides the signals emitted by the control board into several tributaries, also known as the distributing boards. In general, according to the longitudinal number of LED electronic screen module itself.
The display contains various signals. The signal starts from the HUB board and completes the data transmission through the line to the unit board or module. Besides the serial transmission of data signals, all other signals are transmitted in parallel. A variety of signal functions are now analyzed as follows:
1, CLK clock signal:
A shift pulse is provided to the shift register, and each pulse will cause data to move in or out of one bit. The data on the data port must be coordinated with the clock signal to transmit data normally. The frequency of the data signal must be 1/2 times the frequency of the clock signal. In any case, when the clock signal is abnormal, the whole panel will be disordered.
2, STB latch signal:
When the data transmission is completed, the STB latch signal is valid, and the data in the shift register is locked and the data content is displayed through the drive circuit on LED. However, because the driving circuit is controlled by the EN enable signal, the prerequisite for lighting is to enable the state to be turned on. The latched signal also needs to be coordinated with the clock signal to display the complete image. In any case, when the latch signal is abnormal, the whole panel will be disordered.
3, EN makes energy signal:
The whole screen brightness control signal is also used for screen blanking. As long as the duty cycle is adjusted, the brightness changes can be controlled. When the enabling signal is abnormal, the whole screen will appear unlit, dark bright or tailed.
4. Color data signal:
Provide the data needed to display the image. It must be coordinated with the clock signal to transmit data to any display point. Generally, the red and green data signals are separated from the display screen. If a data signal is short circuited to the positive or negative, the corresponding color will be all bright or not bright. When the data signal is suspended, the corresponding color will be indefinite.
5, ABCD line signal:
Only in dynamic scanning display, ABCD is actually a binary number, A is the lowest, if the use of binary representation ABCD signal control maximum range is 16 lines (0000-1111), 1/4 scan as long as the AB signal is OK, because the AB signal is 4 lines (00-11). When the control signal is abnormal, there will be a display of malposition, highlight or image overlap.
Shenzhen lead Optoelectronic Technology Co., Ltd., founded in 2007, is a national high and new technology private enterprise which focuses on the research and development, manufacturing, sales and service of LED display products. The company is in line with the leader photoelectricity: a good screen, ten thousand kinds of wind colors. "Enterprise vision, committed to providing customers with high quality, high-performance LED application products and services!
On the basis of the forward-looking research on LED display and the accurate positioning of the business strategy, the company has realized the development pattern of product characteristics, market internationalization, business comprehensive and service specialization; with its unique competitive advantage, it has been recognized and supported by customers and suppliers, and has rapidly developed into a domestic LE D is the leading enterprise in the field of application products.
The leader team is adhering to the principle of "no accumulation of thousands of miles", no accumulation of small streams, no river, quality is the root, reputation is the source, human is the foundation. "The business philosophy, keep in mind the enterprise spirit of" living in danger, thick and thin, and win step by step ", with the vision of" leading the way people photoelectric: a good screen, ten thousand kinds of wind color ", strive to be the leader of the times, add color to the" made in China "!