lcd 16x2

L

lakis

New Member

• Nov 27, 2012

• #1

Hi guys
recently i bought a LCD 16x2 to connect with my pic18f4520 .But when i got the LCD i saw that there are 16 pin in the lcd two more pin for LED backlight.
My question is to i have to connect the two LED back light pin or it will work fine and without those.
Thank you.

 

W

Wp100

Well-Known Member

• Nov 27, 2012

• #2

Hi,

It will work fine without the backlight.

The backlight typically need about 4.2v max so a dropper resistor from the +5v line is needed if you want it on.

 

Last edited: Nov 27, 2012

L

lakis

New Member

• Nov 27, 2012

• #3

thanks for your answer .
if i connect 5v it will destroy my screen?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Nov 27, 2012

• #4

lakis said:

thanks for your answer .
if i connect 5v it will destroy my screen?

Click to expand...

Yes!!! The small screens can take @300mA - -- @120mA your datasheet will tell you. I use either a 20Ω or an 82Ω resistor to current limit the backlight.

 

L

lakis

New Member

• Nov 27, 2012

• #5

thank you