Color artifacts on display (SPI+18-bit RGB) using ST7701s driver

[HP]

Hi!

I'm getting 2 round displays up and running using tGFX on an STM32F767 (custom board, external SDRAM and QSPI)

I think almost everything is running but I have some weird artifacts. the clearest I can show is the color wheel test.

While the image is 24-bit and the display is 18-bit I wonder why I see the clear lines across the display (Please disregard the red stripe horisontally - that's a smudge on the protective film)

To me it would seem like something like a rounding of the color information but that would make much more sense if I was coming from less than 18-bit.

Anyone who can offer some insights here or point me in a direction? I tried with a real image and certain colors just get REALLY wonky..

[contactmeajay]

 

Hi,

I am also trying st7701s using rgb and spi 9-bit.

i  facing an issues of getting vertical bands when i try to draw horizontal lines.

have you experienced any such issue or suggest some reason.

Regards

Ajay Sharma

[BaileyKuphal]

thanks for sharing