What does the LCD datasheet give as the forward voltage for the LED ?

How much current is flowing through the backlight with your 11 ohm resistor?

What else is being powered from the 5V rail.

What is the current rating of your 7805 ? 100mA 1A 2A

Does the 7805 have a heatsink an what is its input voltage ?

Has the smoke escaped yet because when it does it will stop working !!!