DFR0847 - 0.96" TFT - GDI Interface, backlight

Good afternoon,

I'm using the DFR0847 display in a device, connecting it to the DFR0654 board (esp32-e) using the GDI interface.

I'd like to turn the display off if the user hasn't interacted with the device for a given time, but as I'm using GDI rather than the pins on the back, I don't know how to do that. Can you advise please? Which pin should I pull up/down?

Thanks.