The reasons that affect the display of garbled characters on COG screens are as follows:
<p> & nbsp; <\/p> 1It is related to the speed of the program's clock frequency: if it is a fast microcontroller, the clock can be adjusted appropriately to prolong the delay.<p> & nbsp; <\/p> 2Related to communication interface: If using a parallel port, there will be no random display phenomenon. If using an SPI serial port, it is necessary to add unused empty pins to connect to VSS or VDD (preferably connected to VSS: this is less sensitive to the program, but the power consumption will be around 1mA); If connected to VDD, if the program is not written properly, it will still display randomly, but connecting VDD has the lowest power consumption, about 0.05mA~0.3mA.

<p> & nbsp; <\/p> 3Related to nearby interference: do a good job in anti-interference and electrostatic discharge during circuit design; Sometimes, if EL backlight is used, its electric field can affect normal display and cause display flicker. It is necessary to handle the EL electrodes in the circuit design, such as designing them to be farther away from the screen or changing the electrode direction, in order to solve the EL interference problem. Using LED light-emitting diodes as backlight will not have such phenomena.