An LCD display that can display a max of 16×2 charactors. with the help of the I2C bus convertor and related libraried, you can easily use this module with just 2 wires.
You can find the usage here:https://osoyoo.com/2014/12/07/16×2-i2c-liquidcrystal-displaylcd/
The Backlight can be controlled by the firmware or the on-board jumper:
lcd.backlight();// light on the backlight; lcd.noBacklight();//light off the backligth;
There is a jumper on the board, if you take away this jumper , the backlight will aways be off, and you can also control the LCD contrast by adjust the on-board potentiometer.
Arduino library: LiquidCrystal_I2C
For Raspberry Pi:
DownLoad Url osoyoo.com