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LCD graphical displays

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JasonL220

New Member
does anyone know of any 122*32 graphical lcd displays that run from a 3.3V power supply? possibly with a 3.3V backlight?

thanks
 

Hero999

Banned
No, I don't think they are any.

3.3V is too low for LEDs and an inverter to power a CCT backlight would require a considerable current.

Can't you just use a switching regulator to provide a higher voltage, or use a higher voltage supply and a regulator to power the 3.3V part of the circuit?
 

Oznog

Active Member
I think they're out there, cell phones commonly have 3.3v systems.

How big an LCD did you need? What display type?

Sounds to vague to make a recommendation on yet.
 

hjames

New Member
I'm pretty sure all LCD's require more than 3V to work - and sometimes there's some really odd bias voltages required for the graphical ones. A small stepup switcher is ~1cm on a side and is relatively cheap.
 

Hero999

Banned
Oznog said:
I think they're out there, cell phones commonly have 3.3v systems.
But don't they have a little smps to increase the voltage?
 

hjames

New Member
I remember getting one of these graphical displays once (without reading the data sheet too carefully) 128x32 matrix display

http://www.mouser.com/search/Produc...1N000virtualkey62800000virtualkey628-G1213B1N

Then when I'm about to mess with it, I finally realize that the part needs a -8V bias signal, which also doubles as the contrast adjust. That and it is a 5V part. Too much hassle.

OLED's seem like a better tradeoff - supply a single high voltage ~12V, and since all the parts are relatively new, all the logic levels are sitting at 3V.
 
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