CarTFT CTF-700SH and 800x480

**clam** · 07-11-2009, 03:28 AM

I recently bought a CTF-700SH transflective LCD from cartft.com. The LCD seems nice, although I haven't yet had the chance to try it in bright sunlight. But I have been completely unable to get it to display its native resolution of 800x480. (Seems I'm hardly unique in having this problem, but a search didn't turn up any solutions for this particular LCD.)

I've tried countless modelines, tried the onboard video (945GC) on my Intel D945GCLF2 motherboard as well as a couple spare PCI video cards I had floating around (a Radeon 9250 and a GeForce FX 5200), and tried it under both Linux and Windows, to no avail.

The closest to success I've come was with the following timings:

Code:

Modeline "800x480" 39.822 800 828 918 1066 480 481 483 500 -hsync -vsync

...but although those got me a 800x480 screen that filled the display, the picture quality was terrible, with horizontal scaling artifacts that gave me the impression it was resampling the 800x480 signal down to 640x480 and then back to 800x480.

I'm starting to wonder if this display can even display an 800x480 signal, although the specs page certainly seems to suggest it can.

Does anyone have any experience with the CTF-700 display and whether it can display 800x480? Bonus points if you can provide timings or other configuration info.

If all else fails, image quality isn't terrible when feeding it 800x600 -- but it feels silly to have a LCD and not be able to run at its native resolution...

**clam** · 07-21-2009, 12:51 AM

Well, I checked with Oliver at cartft.com about this problem. I tried both the driver he recommended, and the following timings he suggested:

Code:

Pixel   31,250
H       42,80,102
V       1,3,13

Unfortunately, these give me the same result I had before: an 800x480 display with horrible horizontal scaling artifacts, as though it was being resampled down to 640 and back up.

Have to say I'm pretty thoroughly disappointed in this LCD -- I've invested many hours tinkering with it, with no success at all at getting it to display its native resolution.

**rijk** · 07-21-2009, 02:13 PM

i have the same problem as you, the cpc doesn't support the 480x800 resolution.
But that very same screen on the desktop and it does display 480x800.
So i think its not the display, but the videocard / onboard video that’s at fault

**davedave1234** · 07-21-2009, 03:42 PM

Why not just use 800x600? I have the lower priced version of that display and it looks perfect at 800x600 with every front end and skin I have tried.

**clam** · 07-25-2009, 10:57 PM

Originally Posted by rijk

i have the same problem as you, the cpc doesn't support the 480x800 resolution.
But that very same screen on the desktop and it does display 480x800.
So i think its not the display, but the videocard / onboard video that’s at fault

Good thinking, but I just tried it on one of my desktops with the same results. I've also tried several different video cards on both machines. Still no luck.

**clam** · 07-25-2009, 10:59 PM

Originally Posted by davedave1234

Why not just use 800x600? I have the lower priced version of that display and it looks perfect at 800x600 with every front end and skin I have tried.

That's the best option I've found so far, and I may wind up doing just that. To be fair, it doesn't look all that bad. But I do see noticeable vertical scaling artifacts (esp. w/ small text), and I'd much prefer that everything look perfect.

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