Universal type 2 x 16 liquid crystal display (LCD) character module, with yellow backlight, ideal for embedded system development. A row of male header pins has been soldered for easy prototyping (just plug into breadboard). Suitable for Arduino and Raspberry Pi.
When you are using this LCD, you have choice whether to light up the backlight or not. If you choose to light up the LCD screen, then it would be like the picture below. To light up the LCD screen just connect LCD pin K to GND.
Or you don't wanna light up the LCD screen, just disconnect the LCD pin K from GND.