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2.4" TFT LCD Brightness Control



I am using NHD-2.4-240320SF-CTXI#-FT1 LCD which has built-in ILI9340 controller. I connected the LCD's backlight LED pins directly to a power source and they are working good (internally biased). I want to control the LCD's brightness through the ILI9340 controller's backlight control registers but am unable to change the brightness level using those registers.

I want to know, can the LCD's backlight be controlled through ILI9340 registers or do I need to control the brightness externally through some circuit.


The backlight is independent of the TFT controller.  Therefore the latter would be correct; you would need to control the brightness externally.


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