Gravity: I2C 16x2 Arduino LCD with RGB Backlight Display V1.1

Hi, what chip exactly is build in as backlight in version 1.1, the one with address 0x6b? 

I tried to transfer the code from the GitHub example, because I am not using Arduino, but some other MPU.

However, the backlight color setting is not working it seems, it is always blue.

I want to look things up in the datasheet.

Thx