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Messages - wilens

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1
TFTs / Re: No Green on 24-bit color TFT
« 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.

2
TFTs / 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.

3
TFTs / Re: NHD-7.0-800480EF-ATXV
« on: June 06, 2015, 09:09:15 AM »
Concerning porches:
I am new to displays; but I have come to some conclusions and I hope you can confirm or correct me. Since I am spinning my own controller, it seems that the porches don't matter (they don't change the image) except that they add dead time and slow down throughput. Porches are a throwback to analog CRT days. The first DEN enabled data word after HSD is always the first pixel. The last enabled data word before the next HSD is always the last pixel for that row. It is just that some controllers use the extra porch time to add video effects.
http://en.wikipedia.org/wiki/Vertical_blanking_interval


4
TFTs / Enabling Built In Self Test - BIST
« on: May 09, 2015, 08:26:42 AM »
For the NHD-7.0-800480EF-ATXV, I noticed that the HX8264‐D02 Source Driver has a BIST pin (Built In Self Test). There is no pin like this on the 40-pin TFT connector; but I was wondering if perhaps one of the traces or resistors on the flex circuit was connected to this pin which would allow me to easily test the product?

5
TFTs / Re: NHD-7.0-800480EF-ATXV
« on: March 11, 2015, 07:15:06 PM »
Thanks again for your help. I guess I'm a bit ignorant about how the porches relate to ghosting and flickering in an LCD. Can you point me to somewhere I can read up on it?

6
TFTs / Re: NHD-7.0-800480EF-ATXV
« on: March 11, 2015, 08:42:46 AM »
Thanks for your answers.

The data sheet gives a range of HS Front Porch 1-255 DCLK and VS Front Porch 1-255 Th. Does this mean I can use anything in this range and it doesn't matter, or do these values adjust the position of the screen and I need to determine them on my own?

7
TFTs / NHD-7.0-800480EF-ATXV
« on: March 11, 2015, 07:10:20 AM »
I'm planning to use an NHD-7.0-800480EF-ATXV-T driven directly from an FPGA.

What mode is the source driver set to? DE or HSD/VSD mode?

What HS front porch value should I use? Also VS front porch?

Will it be readable in direct sunlight?

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