Rayman said...
I think displaying a high-color picture on the display will be a challenge for the Prop! I'm not really sure if this display actually has any GRAM... It may just be like a regular VGA monitor, with no memory. In that case, the TFT itself will hold an image for a while, but will need to be constantly updated...
^ I was thinking the same thing.
Thanks for providing the datasheet.· My take is that it is a simple video display with no onboard ram, requiring a constant stream of video data to display an image.
For most ucontroller projects, the 6 bit color is probably sufficient to make a great touch screen interface.
I'm not certain that you could drive the display in full color without external ram...·I'm not certain an SD card could provide the data fast enough.· You'd need 391680 bytes for full 24bit color depth (480 x 272 x 3 bytes), and have to pass that 60 times a second; that's 23.5 MBs.
edit -
Tubular said...
One thing that interests me about that display (and its 4.3" cousins) is that they don't specify a minimum dot clock.· I wonder if it therefore possible to assemble images on the fly (JPG decoding?) .· Or to send 1/8 of the screen, then pause and assemble the next 1/8, send the next 1/8 etc..
·You know, I'm not sure if the display is 'static'...· That's a damn good question.
Post Edited (Agent420) : 8/18/2009 11:38:12 AM GMT
Well, I'll find out tomorrow maybe!
I'm going to start by trying a very slow SPIN driver and see if it will work at all...
It is a little strange that the datasheet doesn't give a minimum dot clock...
If it does need 60 Hz, my fallback plan is to modify the VGA driver to drive the display. Perhaps even allowing simultaneous VGA and LCD display...
I would definitely be interested in a used touchscreen. Will you be selling the Accessory board for the PSM at the Expo? How much is the Accessory board? ·Thanks!
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What electronics need - MORE POWER!!!!!!!
Sorry, I won't have more accessory boards ready for the expo... The excitement over this new display caused a bit of delay on that front...
I'll have to double check, but I think I only have the "like new" displays at the moment...· But, I'm expecting the "slightly used" ones in the near future...
Comments
Thanks for providing the datasheet.· My take is that it is a simple video display with no onboard ram, requiring a constant stream of video data to display an image.
For most ucontroller projects, the 6 bit color is probably sufficient to make a great touch screen interface.
I'm not certain that you could drive the display in full color without external ram...·I'm not certain an SD card could provide the data fast enough.· You'd need 391680 bytes for full 24bit color depth (480 x 272 x 3 bytes), and have to pass that 60 times a second; that's 23.5 MBs.
edit - ·You know, I'm not sure if the display is 'static'...· That's a damn good question.
Post Edited (Agent420) : 8/18/2009 11:38:12 AM GMT
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Visit some of my articles at Propeller Wiki:
MATH on the propeller propeller.wikispaces.com/MATH
pPropQL: propeller.wikispaces.com/pPropQL
pPropQL020: propeller.wikispaces.com/pPropQL020
OMU for the pPropQL/020 propeller.wikispaces.com/OMU
I'm going to start by trying a very slow SPIN driver and see if it will work at all...
It is a little strange that the datasheet doesn't give a minimum dot clock...
If it does need 60 Hz, my fallback plan is to modify the VGA driver to drive the display. Perhaps even allowing simultaneous VGA and LCD display...
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
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What electronics need - MORE POWER!!!!!!!
Post Edited (blittled) : 8/18/2009 4:21:40 PM GMT
I'll have to double check, but I think I only have the "like new" displays at the moment...· But, I'm expecting the "slightly used" ones in the near future...
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
I'm able to turn the backlight on, change the color on the display and can read from the touchscreen!
A lot of work to do though...
But, I'm very happy because now I have something new to talk about at the expo!
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm
I hope someone will record the talk at the Expo.
Jim
Here's the Digikey part number for the connector I'm using: 609-3439-1-ND
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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm