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Powering LCD backlight
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Please be positive and constructive with your questions and comments.

Powering LCD backlight

by altheahanson on Fri Sep 21, 2018 10:17 pm

I am purchasing several of the White LED Backlight Module - Large 45mm x 86mm. But I need to know what you recommend to power them? Also can two be run off one power source? I actually need a larger light but I think I can mount them side by side as long as I can power them with a reasonable size battery solution. One more question- are they cool to the touch while in operation?

I make 3D printed lithophanes and this seems like a perfect solution to illuminate them.

Thanks so much!

altheahanson
 
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Joined: Fri Sep 21, 2018 10:13 pm

Re: Powering LCD backlight

by adafruit_support_bill on Sat Sep 22, 2018 6:36 am

Electrically, you would handle these as any other white LED. These have a forward voltage (Vf) of about 3v, so if powering with more than 3v, you will need to add a current limiting resistor to keep the current under 20mA.
https://cdn-shop.adafruit.com/datasheet ... 45W-1W.pdf

You can wire multiple modules in series or in parallel depending on the voltage of your power source. This guide has some details on powering groups of LEDs:
https://learn.adafruit.com/lets-put-led ... om-scratch

Each LED will give off less than .02 watts of heat. So they will stay relatively cool in operation.

adafruit_support_bill
 
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Re: Powering LCD backlight

by altheahanson on Sat Sep 22, 2018 11:24 am

Thanks so much!

altheahanson
 
Posts: 2
Joined: Fri Sep 21, 2018 10:13 pm

Please be positive and constructive with your questions and comments.