I am writing to request technical assistance regarding a display issue we are encountering while developing with the STM32MP257FA. We have connected an OLED display via the LTDC interface using the RGB888 communication protocol.
[Issue Description] While the display output is functional and the image is visible, the colors appear significantly "washed out" (desaturated) compared to the original source image. It feels like some color data is being lost or attenuated.
[Troubleshooting Steps Taken] To address this, we have already performed the following debugging steps:
Signal Integrity: We suspected a potential issue with the R5 data line (and others) and have attempted to adjust hardware parameters, including impedance matching, trace length, and clock timing.
Cross-Verification: We replaced the OLED module with a new one to rule out a component defect, but the symptom remains identical.
[Attachments] For your reference, I have attached the following files:
Schematic: Our hardware circuit design.
Original Image: The source image file. (123.png)
Issue Photo: A photo of the actual display showing the color degradation.(20260109_114411.jpg)
Could you please advise if there are any specific configuration settings or hardware considerations we might have missed?
Additionally, I would greatly appreciate it if you could share any hardware reference design guides or application notes related to the LTDC interface for this MCU.
Best regards
