When using the dot matrix LCD screen, if there are many dots and few dots missing, half-width deviation, as shown in the figure below:
The dot matrix LCD screen displays the half-width deviation as shown in the figure above, which is normal after restarting, but appears irregularly.
Similar to this kind of dot matrix LCD screen with more dots, fewer dots, misalignment, etc., are all LCD screen timing mismatches. This situation occurs randomly and will not be fixed. The most common solution is to appropriately reduce the reading and writing refresh speed of the dot matrix LCD screen, which is mainly for speed matching. It does not need to be reduced much, and it will not affect the system work.
This is the only way for dot matrix LCD screens with fewer and more dots, and 99% of customers have solved it. The dot matrix LCD screen is read normally, and the write signal is changed from high to low by adding 7,8 empty instructions to a little bit longer-just a little bit.
