Can everyone understand the signal of the LED screen? If we understand these different signals, we can promptly solve the problem and avoid the occurrence of garbled code and other phenomena. LED display screen manufacturer Leiling Display explains the five common signal reasons for everyone:
They are: CLK clock signal, STB latch signal, EN enable signal, data signal, ABCD line signal
1. CLK clock signal: A shift pulse provided to the shift register, each pulse causing data to be moved in or out by one bit. The data on the data port must be coordinated with the clock signal in order to transmit data normally, and the frequency of the data signal must be 1/2 times the frequency of the clock signal. In any case, when there is an abnormality in the clock signal, it will cause the entire board to display in disorder.
2. STB latch signal: Sends the data in the shift register to the latch and displays its data content through the driver circuit by lighting up the LED. However, as the driving circuit is controlled by the EN enable signal, the prerequisite for its illumination must be that the enable is in the open state. The latch signal also needs to be coordinated with the clock signal to display a complete image. In any case, when there is an abnormality in the latch signal, it will cause the entire board to display in disorder.
3. EN enable signal: Full screen brightness control signal, also used for screen blanking. Just adjust its duty cycle to control the brightness change. When the enable signal is abnormal, the entire screen will experience phenomena such as off light, dim light, or trailing.
4. Data signal: Provide the data required for displaying the image. It is necessary to coordinate with the clock signal to transmit data to any display point. Generally, in the display screen, the red, green, and blue data signals are separated. If a certain data signal is short circuited to the positive or negative pole, the corresponding color will appear fully lit or not lit. When the data signal is suspended, the corresponding color display may vary.
5. ABCD line signal: It only exists during dynamic scanning display. ABCD is actually a binary number, and A is the lowest bit. If binary is used to represent the ABCD signal, the maximum control range is 16 lines (1111). In a 1/4 scan, only the AB signal is needed, because the representation range of the AB signal is 4 lines (11). When there is an abnormality in the line control signal, there will be phenomena such as display misalignment, highlighting, or image overlap.