Q:

LCD module with backlight

I am using COG-C144MVGI. I am trying to turn it on with my Raspberry Pi.
I am not sure if I am following the "power on sequence" correctly. Does this kind of LCD modules work without backlight? I am wondering if I am supposed to get some kind of reaction on the screen even without backlight. Thank you.
Here is the datasheet : 
https://www.avrfreaks.net/sites/default/files/COG-C144MVGI-08%20Full%20Spec.pdf

A:

Probably you will see information on the display when the backlight is off, but not when it is dark (or not so light).
(Also, there exist LCD displays without backlight).
However, a reason to switch backlight off, is to preserve current (especially useful in a battery operated system).
Page 6/7 show information about LED A/LED K how to control the backlight.

