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Messages - markgm

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TFTs / NHD-3.5-320240MF-ATXL with full controller?
« on: August 12, 2016, 04:09:06 AM »
Hi I was wondering if New Haven do the above display with a full controller onboard with GRAM so we could possibly update it serially.
The problem we are having with the above display is maintaining the link to the display to keep it from flickering.

What is the general cost increase from going to a Gate Source chip with RGB interface to onboard Controller with GRAM so you can update it slow parallel or serial?

TFTs / Re: TFT LCD drive problem
« on: August 10, 2016, 02:43:09 AM »
It looks ok to me, but all colours are off. You will need to check your signals from DE H & V. Use init with a Colour so it is easier to determine if anything is coming through. But most of all you need to look at the timing of signals. Also I don't see you switching the Backlight.

TFTs / Re: NV3035C Dot Clock Lower Timing 6.1MHz
« on: August 10, 2016, 02:30:15 AM »
Thanks for the reply. Yes I have seen flickering. I guess the device is based around 60Hz refresh for a 320*240 display hence the 6.4MHz nominal.

TFTs / NV3035C Dot Clock Lower Timing 6.1MHz
« on: August 09, 2016, 05:03:51 AM »

I am using the NHD-3.5-320240MF-ATXL#-T-1 with a built in NV3035C. I was wondering what the limit is for the 6.1MHz min Dot Clk. Is this related to the retention of the signal level for each TFT cell? The reason I ask is that I have been able to operate it way outside its limits, down to around 1MHz Dot Clk without problems. Obviously when I pause while debugging the screen will fade but this takes a few seconds.

So the question is, since it looks like it is edge driven from the Dot Clk, HSync and VSync, why would it be critical to drive it at 6.1MHz and above? I could understand the upper limit of 8MHz (possibly not achieving the correct levels).

Thanks in advance for any assistance given.

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