Running OLED128 Display on less than 5V

128x128 pixel 1.5" full colour OLED display with MicroSD card slot. [Product page]
Post Reply
nixon1
Posts: 2
Joined: Thu Oct 31, 2013 4:23 am

Running OLED128 Display on less than 5V

Post by nixon1 » Thu Oct 31, 2013 4:26 am

Hello,

I want to use the OLED128 display in a mobile setting. Is it possible to run it off of less than 5V? I am thinking of using a 3V coin cell or 3.7V lithium polymer battery.

Thanks!

andrew
Freetronics Staff
Freetronics Staff
Posts: 978
Joined: Sun Jul 14, 2013 7:06 am
Location: Melbourne, Australia
Contact:

Re: Running OLED128 Display on less than 5V

Post by andrew » Thu Oct 31, 2013 9:37 pm

The OLED runs from 3.3V nicely. I wouldn't recommend a coin cell, you will go through those pretty quickly :)

nixon1
Posts: 2
Joined: Thu Oct 31, 2013 4:23 am

Re: Running OLED128 Display on less than 5V

Post by nixon1 » Thu Oct 31, 2013 10:26 pm

Thanks! On a related note, could you tell me how much current the display draws? I need to decide what capacity lithium polymer battery I need for my application. I know the current will vary based on how much of the screen is illuminated and what colors are used, could you just give me a maximum or average value? I tried looking for this on the website and in the data sheets but couldn't find it.

- Chris

angusgr
Freetronics Staff
Freetronics Staff
Posts: 853
Joined: Tue Apr 09, 2013 11:19 pm
Location: Melbourne, Australia
Contact:

Re: Running OLED128 Display on less than 5V

Post by angusgr » Thu Oct 31, 2013 11:40 pm

Hi nixon1,

John surprised me, I actually thought 3.3V would be too low for the onboard boost converter. But I just tested it myself and then went back to the datasheets and calculated everything and it's fine, well within specifications.

I've updated the product page with some specifications, including power consumption: http://www.freetronics.com/products/128 ... ifications

For the power numbers I measured with VCC = 5V. At 3.3V the efficiency is probably marginally lower so I'd factor in a bit of extra headroom.

- Angus

Post Reply