xfrings created this 3.3V to 5V level converter to drive a RGB LED Matrix from a Raspberry Pi:

RGBMatrixHat

The design files and source code are available on GitHub:

The RGB LED Matrices are large scale panels which are the ones which are used on video walls (for example in Times Square or on the faces of skyscrapers). Essentially these are ordered rows of RGB LEDs with no driving logic or controllers on them what-so-ever. All driving and control logic needs to be implemented externally.