2 inch composite signal LCD screens, where to get them?

[Mike Streetz]

I would like this: https://www.adafruit.com/product/911but for less money. 

I can find the screen for sale on its own, it’s the driver board I can’t find anywhere. 

Something like this seems to have the right size LCD: https://www.banggood.com/PVP-8-Bit-Color-Screen-Handheld-Game-Console-Support-TVOUTVideo-Classic-FC-Games-p-1113477.html?rmmds=search

but it is always out of stock. If they can sell the whole system for under $10 then the driver board and LCD must be for sale somewhere for well under that. The only issue would be if the screen board combo had a way to get a composite signal in. 

I’m open to methods of converting composite/hdmi out to work with such a screen, as long as it doesn’t cost too much. 

It’s all for a tiny console project running off a pi zero, ideally from the composite tv out, or from the hdmi if I can figure out a way to convert the signal into whatever cheap lcd/driver board combo I find. 

Any thoughts on sourcing and signal conversion are most welcome. 

Cheers,

Mike

 

[Kris]

Closest I found was 3.2 inch display for 10 dollars.
https://m.aliexpress.com/s/item/32699488794.html

If You're looking for that actual model then you should try taobao but unless you're very good with writing your own drivers and designing your own circuit board I wouldn't recommend it.

Also, I doubt very much that device is rendering from composite. It has cvbs out
But it will be spi or lvds internally.

Hints for tonal
http://hackaday.com/2017/03/28/source-parts-on-taobao-an-insiders-guide/

Kris

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From: Mike Streetz <got...@gmail.com>
Sent: 1 July 2017 09:44:17 GMT+10:00
To: sydney-h...@googlegroups.com
Subject: [RnD] 2 inch composite signal LCD screens, where to get them?

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Sent from my Android device with K-9 Mail. Please excuse my brevity.

[Matt Callow]

Does it have to be 2inches?

Does it have to be composite?

There are a number of drivers for TFT libraries in the rpi kernel now. Take a look here:
https://github.com/notro/fbtft

It has lots of info on screens that work. The drivers are now in the mainline kernel so no need to install separately.

I recently bought one of these, and it works without issue (except that you can't control the backlight)

http://www.ebay.com.au/itm/4-inch-RPi-IPS-Touch-Screen-Module-TFT-LCD-Display-For-Raspberry-Pi-Model-B-B/142272026995

Matt

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[Mike Streetz]

It has to be the same size as the adafruit 2" one as it's going into an existing case.

It doesn't have to be composite but it needs a decent refresh rate. 

Last I looked driving the LCD from the Pi led to variable frame rates that could drop down to 10fps. Has this been fixed now?

As long as the backlight is on I don't need to change brightness settings. 

The adafruit 911 ticks all the boxes but it's too expensive. 

Would be great if I could find a screen that size, drive it natively, and get 30fps in RetroPie. I'll have a look at that link and see if any of the supported screens fit the bill. 

Thanks

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