Can we PWM an LED backlight on LCD module

[Demon]

From what I've seen so far, backlights on LCDs (often over 100mA) still consume a lot of current compared to the logic circuit (usually in single mA). I'd like to improve that.



Since LED backlights generally run on 5V without resistors (I'm assuming resistors are now built-in and cannot be "easily" disabled), I was thinking of running the backlight on 7 VDC, but with PWM.

Is there a reason why this wouldn't work just like it does for ordinary single LEDs?

In my feeble mind, LED is LED, shouldn't it act the same way?