BUF20800-Q1: about VCOM work volatge is abnormal issue

Lawrence He

Part Number: BUF20800-Q1

Tool/software:

Hi, Support Team

we use BUF20800-Q1 and find VCOM Voltage is abnormal and then abnormal display defect but became normal display after a few seconds. as below chart:

schematic:

VCOM work voltage waveform catch screen:

and then abnormal display defect but became normal display after a few seconds.

about Vcom voltage have pulse cause display is defect?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

0 Patrick Yao over 1 year ago

Hi Lawrence,

With the abnormal IC, will this anomaly be reproduced every time you power on the display? Or this anomaly will occasionally occur on every IC?

Patrick

0 Lawrence He over 1 year ago in reply to Patrick Yao

Genius 3115 points

Hi, Patrick

With the abnormal IC, will this anomaly be reproduced every time you power on the display?

Yes, why VCOM could effect display?

if any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence

0 Patrick Yao over 1 year ago in reply to Lawrence He

Hi Lawrence,

VCOM is the common node of the LCD TFT, it should be stable so that the LCD will maintain correct voltage.

Patrick

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