Can I use the 5V to light the backlight?
Please refer to the Backlight Information on our datasheet as the backlight condition. Use the formula V=IxR to calculate the RA value. In the example below we take 5V as customer's power supply, 3.5V as typical voltage supply for the backlight with 48 mA of current. Using the formula below we get the value of RA as 31.25Ω.