LCD TFT Backlight voltage?
No, the backlight is six white LEDs in series. 5V is not enough to overcome the sum of diode threshold voltages so it won't work.

It is possible to buy LCD displays where the LEDs are in parallel and these can be powered from 5V. However series connection is more common since there are plenty of low cost boost ICs you can get to drive them, and these will allow operation from a wide range of supply voltages and incorporate PWM and current regulation brightness control (not always easy to get right, especially if you are worried about colour balance).