DS90C189-Q1: display

Adityan Jothi1

Part Number: DS90C189-Q1

I am driving G156HTN02.0 LCD display thro DS90C189 in SIDO mode. I use 148.5MHz as pixel class and VSYNC, HSYNC and DE signals are good. But on display I get multiple windows like as attached pic. What could be the isssue.

Adityan

over 5 years ago

0 Charley Cai over 5 years ago

TI__Genius 12866 points

Hi Adityan,

Do you have a picture of the expected output?

Best Regards,

Charley Cai

0 Adityan Jothi1 over 5 years ago in reply to Charley Cai

Prodigy 50 points

This is the pic

0 Charley Cai over 5 years ago in reply to Adityan Jothi1

TI__Genius 12866 points

Hi Adityan,

Could you provide the output timing including horizontal and vertical resolution and verify if the resolution matches the expected timing by the display?

This looks like the output resolution might be off.

The color looks off as well. Could you also verify the C189 LVDS mapping matches the expected mapping?

Best Regards,

Charley Cai

0 Adityan Jothi1 over 5 years ago in reply to Charley Cai

Prodigy 50 points

Hi Charley.

Yes.it is timing issue. Thanks for the feedback. Still I have issue with color. I use G156HTN02.0 LCD I do not know which color mapping to use.

Thank You

Adityan

0 Charley Cai over 5 years ago in reply to Adityan Jothi1

TI__Genius 12866 points

Hi Adityan,

Do you have the datasheet of the G156HTN02.0 LCD?

Could you share your C189 input and output connection?

Best Regards,

Charley Cai

0 Adityan Jothi1 over 5 years ago in reply to Charley Cai

Prodigy 50 points

Hi,

I have attached data sheet of the LCD and connection schematic.

Adityan20160628_GD_PSpec_G156HTN02.0_KAGA.PDF bscan_color_part.pdf

0 Charley Cai over 5 years ago in reply to Adityan Jothi1

TI__Genius 12866 points

Hi Adityan,

This is where I see some issues.

On your schematic, OA_3+ is connected to pin 1 of the connector, OA_3- is connected to pin 2 and so on.

By C189 datasheet definition, OA will be the odd bits and OB will be the even bits.

The input LVCMOS data is split into odd and even pixels starting with the odd (first) pixel outputs OA_[3:0]+/- and then the even (second) pixel outputs OB_[3:0]+/-.

On the display datasheet page 17, connector pin 1 is assigned to Even pixels.

Could you check in your system to see if the signals are routed this way?

If odd/even channels are flipped, you will see color shift.

Best Regards,

Charley Cai

0 Adityan Jothi1 over 5 years ago in reply to Charley Cai

Prodigy 50 points

Thanks. This solves moset of the problem. Still I have some color issue.

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DS90C189-Q1: display