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Using a raw TFT LCD panel

Posted: Thu Jul 19, 2012 8:17 pm
by tetravalence
Hello, I'm new to the Raspberry Pi Forums, but I joined because I have questions about using a TFT LCD display I found online. Here is a link to the display:
http://www.newhavendisplay.com/new-capa ... -5018.html
I've come up with a few potential methods, and I need opinions on the feasibility/possibility of each:
1) Finding an HDMI controller for the panel and using that. Appears to be the simplest, but I can't find any anywhere.
2) Making my own HDMI controller or HDMI converter. I have no idea how this would work, but these are the controllers provided:
http://www.newhavendisplay.com/nhd50800 ... -5597.html (8-bit input)
http://www.newhavendisplay.com/nhd50800 ... -5599.html (16-bit input)
3) Using the DSI connector. I have heard that this is not yet supported, however, and I wouldn't know how to wire it anyway.
The LCD also includes a touch panel, but that's another story (GPIO, I'm assuming).
My experience is in programming and not in hardware, so I'd appreciate any pointers. If necessary, I could write the needed drivers.

Re: Using a raw TFT LCD panel

Posted: Thu Jul 19, 2012 10:12 pm
by jkCBWPnet
I am also hoping for an answer to this post. I happen to have this:
http://www.adafruit.com/products/335
2.8" 8 bit tft lcd w/ 18 bit color...

I use it with Arduino.

I will do some reverse engineering of the Arduino code and compare it to the linux GPIO code that I have been playing with. This would allow me to output "stuff" to the screen, but not necessarily the GUI or CLI as I would hope. I need to somehow find out how to redirect the console through a pipe or something similar? Even a horribly hard (wasteful?) way would be to have some "cron screen-grab to ffmpeg somewhere" I could output that file to the lcd easy. What would the refresh rate/ cpu cycles/ ram use be? probably < 10hz @ a lot using a bunch? :D

Ok I might just buy a composite lcd from amazon or ebay, but it would be cool if anyone knows something that would help connect the lcd I already own. Thanks a bunch. I will reply if I get anywhere on my own...

Re: Using a raw TFT LCD panel

Posted: Sat Jul 21, 2012 6:47 pm
by tetravalence
I'm not sure about whether this would work, but I found an LCD controller with DVI input. HDMI to DVI cables are easy to find. However, I'm not sure if it could be connected to the panel I found. This dearth of information is driving me nuts. Anyway, here's the controller:
http://www.digitalview.com/products/alr ... controller
Does anyone know anything about this or how this would work?

Re: Using a raw TFT LCD panel

Posted: Sun Jul 22, 2012 10:07 am
by jmacdon3
I recently salvaged a Packard Bell 17" screen from a laptop from the following eBay shop

http://stores.ebay.com/njytouch/_i.html ... 3090304018

The company are chinese - njytouch - they have been very helpful. Their controller boards come with instructions - mostly pictures - my old shuttle desktop works a treat. I've just got to find the right confg.txt settings to get the Pi to drive it.

My board, about £25, has VGA and DVI-I inputs. Setting up is straightforward, just flat connector into the panel and HT. There is a small control board with controls for an on-screen menu.

Delivery was quite quick.

This message written curtesy of Raspbian. Have also got a card with Raspbmc - impressive - I've just watched Plan 9 from Outer Space (Youtube movies) and even that looked good.

You need to get access to the bare panel. Controllers are sold for specific models.

Re: Using a raw TFT LCD panel

Posted: Sun Jul 22, 2012 1:40 pm
by OMightyBuggy
They have some pretty cheap screens here https://www.adafruit.com/category/105 now, if people didn't see that they have added more Raspberry Pi things. :)

I bought the NTSC/PAL (Television) TFT Display - 2.5" Diagonal and it works very well with 3 double A batteries. Also bought the case and stuck the screen in it, lol. Snug fit but works. :D

Re: Using a raw TFT LCD panel

Posted: Sun Jul 22, 2012 9:40 pm
by tetravalence
I was actually just looking at their panels, they look like they'd save me a ton of hassle. Do you know if there's any way to power the LCD and the Pi from the same power source? Or power the LCD directly from the Pi?