Author Topic: No Green on 24-bit color TFT  (Read 866 times)

wilens

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No Green on 24-bit color TFT
« on: June 30, 2016, 06:43:41 PM »
I'm using an NHD-7.0-800480EF-ATXV# driven directly from an FPGA. When I generate color bars with the following values I get these colors:

r[7:0] <= 0; // Black
g[7:0] <= 0;
b[7:0] <= 0;

r[7:0] <= 8'h00; // Black
g[7:0] <= 8'hff;
b[7:0] <= 8'h00;

r[7:0] <= 8'h00; // Blue
g[7:0] <= 8'hff;
b[7:0] <= 8'hff;

r[7:0] <= 8'h00; // Blue
g[7:0] <= 8'h00;
b[7:0] <= 8'hff;

r[7:0] <= 8'hff; // Red
g[7:0] <= 8'h00;
b[7:0] <= 8'h00;

r[7:0] <= 8'hff; // Red
g[7:0] <= 8'hff;
b[7:0] <= 8'h00;

r[7:0] <= 8'hff; // Whitish Violet
g[7:0] <= 8'h00;
b[7:0] <= 8'hff;

r[7:0] <= 8'hff; // Whitish Violet
g[7:0] <= 8'hff;
b[7:0] <= 8'hff;

The green (G7-G0) interface does nothing at all - no change in color at all! I see all the signal values (including green) are correct on the flex connector with an oscilloscope. The color bars are extremely stable with no flickering. I also tried a NHD-7.0-800480EF-ATXL#; but it does the same thing.

wilens

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Re: No Green on 24-bit color TFT
« Reply #1 on: July 02, 2016, 01:10:46 PM »
Ooopps, sorry. I was probing the pads on the connector - not the pins. The pins were not well soldered down. Got all the colors now.

 

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