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DS90UB925Q-Q1: DS90UB925 to DS90UB926 screen display dithering

Part Number: DS90UB925Q-Q1

Hello

We used two core boards.One is 921 to 926,another is 925 to 926.926 is the same screen.921 to 926 is normal.925 to 926 is dithering like the video.We tried to use 921 replace the 925.The issue remained.

Parameter is the same as below:

Resolution:1280*760,Frame:60,

Pixel clock:78MHz,

bpp:24bit,

Reducing pixel clock reduces dithering.But dithering still visible.What are the reasons for the issue?How to solve?