I can't get LED backlight to dim when I want it to.

Question

I am trying to get the display to dim between 10:00 pm and 7:00 am. I tried the following code to no avail. What am i missing??

 if(hour()> =7 && hour()<=10) {
      analogWrite(TFT_LED,255);
      } else {
      analogWrite(TFT_LED,40);      //dim backlight between 10:00pm and 7:00am
  }

Answer 1

I'm afraid that our displays don't support back light dimming. This has todo with the inner workings of the TFT_LED pin...