I want to say that "when I press number 2 and 3 in the keypad of the mobile phone, the lights of keys with respect to those numbers are on". Is there a better way to express the lights of the keys are on? Maybe using a verb is better?
Another, related, word is "backlight". That word means the light behind a key, a keyboard, a screen, etc. which has lighting behind it.
Backlight can also be a verb, and there is a past participle, "backlit".
- The screen is backlit
- The later gameboys have a backlit screen
- A keyboard with a dimmable RGB backlight
I have not heard of individual keys being backlit, but I suppose it could happen.
Backlighting is also sometimes used in photography, examining inside eggs, etc.