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DS90UB941AS-Q1: Flash screen problem when temperture ramp up

Part Number: DS90UB941AS-Q1

Hi Team,

This is brandon, meeting a problem on DS90UB941. 

The Flash Screen problem happended when the working temperture ramp up. 

The car machine is placed in the incubator, and the large screen is placed outside the incubator. In the incubator environment, the temperature change process (low temperature rises to high temperature or high temperature decreases), during which a flashing screen occurs

 Screen

Analyze the reasons:

1. During the temperature change process, the input of UB941 is normal (input signal DSI, input clock CLK, etc.), but the output FPDLINK signal is occasionally interrupted. The interruption time is about 100us-7ms; it will automatically recover after interruption.

2.When FPDLINK is interrupted for a short time, that is, UB948 has no corresponding input, UB948 has no LVDS output; and the 948-LOCK signal will be pulled low.

3. When there is no output of LVDS CLK/DATA for a short time (about 100us-7ms), a flashing screen will appear.

4.Disconnect the screen without connecting 948, 941 forces the output pattern mode.

When the temperature changes, the output Fpdlink of 941 will be interrupted for a short time. Confirmed to be the problem with the 941 chip.

Could you help analysis the reason, and give us some suggestions soon?

BR

Brandon

  • Hi Brandon,

    What is the clock source of the 941AS? External or the DSI clk?

    Can you try the same test except with the pattern generator on the 941AS enabled? can you try this test with your normal clk source as the source and with the internal clk as the clk source?

    Regards,

    Michael W.