Screen flickering sometimes

I’m using v7.11 version for my application. Sometimes some flickering will show up, including horizental lines or just some chars show up and disappear, not sure whether I use the LVGL features correctly, or is it some problems caused by the LCD driver?
Attached the sample videos for the issues. Thanks!
LVGLv7.11_flickering.zip (481.0 KB)

Try a program with the lcd driver and no LVGL running. Then try that with LVGL without any widget, a single free window. if it persists in the first case, the problem is with LCD driver. If it happened in the second case, there is something with matching.

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