Newhaven Display Forum

Newhaven Products => TFTs => Topic started by: wilens on June 30, 2016, 06:43:41 PM

Title: No Green on 24-bit color TFT
Post by: wilens 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.
Title: Re: No Green on 24-bit color TFT
Post by: wilens 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.