Working principle of driving IC for industrial LCD
Date:2019-07-30
Driver IC is one of the important components of industrial LCD screen. Have you known the working principle of driver IC of industrial LCD screen? Today, we will popularize the working principle and driving method of industrial LCD driving IC
Driving IC: LED is light-emitting diode. When the number of diodes is large or the power consumption of tubes is large, it needs to be driven, and there are several levels of drivers. These levels of drivers are integrated into an integrated electronic chip, which is called driving IC. In short, it plays the role of providing compensation current for diodes.
The working principle of driving IC is as follows
The chip contains a constant current generation circuit, which can set the output constant current value through the external resistor. The switching time of the output channel can be controlled through the enable end of the chip, and the switching frequency is up to 1 MHz. The current output response is very fast, supporting the application of high color level change and high picture refresh rate. The built-in open circuit detection, overheat power off, and over-current protection functions greatly enhance the reliability of the application system.
Driving method:
·Adjusting method by using current value
·Adjustment method using pulse amplitude modulation technology
The adjustment method of the current value is mainly to change the brightness of the current value adjustment. Here, it is assumed that the luminosity of the white light is 1 times, the luminosity of the white light and the luminosity of the current change become 1.7 times, and the luminosity of the white light becomes 3 times. Although the illuminance and the current value are not proportional, the red light is proportional. The main reason is that the physical properties of the red, green and blue chips are different from each other.
