Display randomly shifts with artifacts at the border

[xinanhuang]

Hi! So I recently connected a st7735s display (80x160) up to my esp32 board and seem to not be able to get rid of random artifacts that cover the border of the screen. It also seems that the display is shifted at times, to which I tried to fix through changing the starting draw location in st77xx.h and changing the size of the draw area. However this doesn’t seem to improve the result, and the display also randomly shifts the displayed content in random direction once in a while.

I’m wondering if this is a timing issue, and if so, how would I be able to fix this? Thanks!

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[makermelissa]

Could you try a slightly older version of the library to see if that fixes the issue? The width and height were recently swapped on this display. Thanks.

[xinanhuang]

Hi! It seems the issue persisted even I called back to the earlier location.

[makermelissa]

Ok, good to know I didn't break anything. Thanks for reporting this.

[makermelissa]

So is this an Adafruit 160x80 display that you are experiencing this with or a different brand? I'm wondering if it's related to #103.

[dsvilko]

You can try setting in _ST77xx.h: #define ST77XX_MADCTL_RGB 0x08 and in _ST7735.cpp:

_colstart = 26;
_rowstart = 1;

Together with thetft.invertDisplay(true), this has fixed the issues I was having with the 0.96" 80x160(RGB)IPS from Aliexpress.