Company News
Two solutions of LCD module basic fault technique
- Time：2021/4/9Source：Shenzhen Kaixian Technology Co., Ltd.
- Question 1: the interface mode of display module is three wire serial interface (b), and the display screen does not show any after power on. How to debug after connecting with emulator does not reflect at all. What is the reason?
Answer: the three wire serial interface (b) module is in sleep state automatically after power on, and the display pin has no waveform output and the display screen has no display, which is normal. If there is no reflection during commissioning, check whether the connection is correct and whether the wiring is reliable, and then find out the reasons from the following aspects:
Question 2: the display module is a digital segment module. Why is the pen segment not shown on the LCD also hidden?
Answer: this phenomenon is called ghost, because the multi-channel drive display module adopts scanning mode, and there is voltage in the pen segment that is not displayed. Normally, when the voltage is far away from the threshold voltage of liquid crystal, the pen segment will not be displayed, but if the working voltage of the module rises beyond the normal working voltage, the voltage is close to the threshold voltage of the liquid crystal, and the pen section will It is hidden. To solve this phenomenon, we mainly consider the following two aspects:
1. Add voltage stabilizing circuit to main circuit to keep working voltage stable.
2. Inform us to lower the LCD Bias in the display module. Change the design, inform us to add voltage stabilizing circuit on the display module to make the LCD bias voltage fixed, and do not change with the external working voltage.
