I’m late to the party on this one.
The board version is silk screened on the back, typically just under the tiny ribbon cable.
Fysetc has several different versions of the display. Some are monochrome back lit, some are fixed color, and the v2.1 that I have is RGB and fully adjustable.
The only cautionary item I’ve run into these displays is that if/when they are on the same SPI bus as other devices. My board shares the SPI bus between the display and Steppers. This v2.1 display defaults to 12Mhz where my TMC drivers only run at 4Mhz. I had to set spi_speed:4000000 to change the display to run slower SPI speed that match the TMC drivers.
There is a menu_timeout, but it only changes the menu back to the main if there is no activity. Does not change LED brightness.
LED brightness is all controlled outside the [display] settings. I have a [neopixel display] section to control the colors. You can control the backlight independently from the dial since the neopixel chain count is 3.