Anomalies on the display

[budzik1678]

Hi. I built the PCB myself at home. While working, I noticed strange anomalies in the image. The anomalies are in different places and on different photos. I asked AI but didn't get a satisfactory answer. I tried reducing the frequency without any positive effect. I suspect ESD or power supply issues. The traces are very thin, 0.4 mm for power and 0.35 mm for data. Has anyone experienced this?

 

[MM..1]

Seems you try … doing many mistakes primary how value is crystal on right long wired place. Secondary your powering is without any capacitor > 100uF . How type is display bus? And how frequency you test lower? Where is your image stored , seems more as issue with memory no LCD.

[cartergray733]

Random image glitches are often caused by signal integrity or power noise issues. Check grounding, decoupling capacitors, power stability, and data line routing before blaming ESD. Thin traces and poor return paths can easily create these kinds of artifacts.

[budzik1678]

Problem solved. The series resistors on the WR, RD, RS, and CS lines between the STM and the LCD were missing. Now everything works. AI Copilot ultimately helped.