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Forum Index : Microcontroller and PC projects : R61505V display driver

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kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 12:03am 14 Oct 2015
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Has anyone ever made a R61505V-based TFT operational from a MM? I see there is a good selection of those in AliExpress, and they are relatively cheap and round. Edited by kiiid 2015-10-15
http://rittle.org

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Zonker

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Joined: 18/08/2012
Location: United States
Posts: 772
Posted: 01:15am 14 Oct 2015
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A round TFT..? Awesome... This would be perfect for gauge displays... Where did you see them..?
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 01:49am 14 Oct 2015
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AliExpress
There are pieces on eBay as well
http://rittle.org

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viscomjim
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Joined: 08/01/2014
Location: United States
Posts: 925
Posted: 02:02am 14 Oct 2015
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THOSE ARE AWESOME!!!! It would be great to have that library.
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10406
Posted: 03:04am 14 Oct 2015
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Can't see any with any sort of breakout board. The bare flexible PCB makes things too hard to develop with as you never know if problems are software or hardware.
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 04:32am 14 Oct 2015
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From the same link to AliExpress
http://rittle.org

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WhiteWizzard
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Joined: 05/04/2013
Location: United Kingdom
Posts: 2948
Posted: 05:04am 14 Oct 2015
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I've often wondered how the pixel addressing works on these round TFTs.

The spec says 220(RGB)x220 (whatever that means!). Where do you think pixel x=0,y=0 is? Could it be the centre? Or is it the top left

Seriously, has anyone played with one of these ever to enlighten me on pixel x,y referencing

WW
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 05:20am 14 Oct 2015
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There are two possible ways to interpret this:

1. The circle is embedded into an imaginary square, and all pixels which are not within the circle are not physically implemented. That means the pixel with coordinates (0,0) actually does not exist on the screen.

2. The entire circle is a one-dimentional helical line like a CD with (0,0) being in the centre.

Which one of these is in reality - I am yet to find out. I have a nice idea for a project with round display, but apparently they are all using either ST7789 (the smaller ones), or R61505V (the bigger ones), and neither of these is currently supported by MMEdited by kiiid 2015-10-15
http://rittle.org

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