led matrix display rj45 hub75 tpm2.net protocol

 https://www.sparkfun.com/tutorials/44

  Open-Source methods for embedded TCP/IP networking. This tutorial will show you how to control a full color LED matrix from anywhere in the world using a Java script on the remote computer and an ARM development board connected to a tri-color serial LED matrix listening to a specific UDP port.

    Intro
    Connections, TCP/IP
    LED Matrix Server
        Hardware
        Software
    Java LED Client
    Expanding the system
        Adding more LEDs
        Internet Enabling the LED matrix server    

 https://en.wikipedia.org/wiki/Dot_matrix

 led matrix  dmx512 HUB08 HUB12 HUB75 HUB40

LED matrix WiseLord 

https://github.com/microcontrollersig/brian-led-matrix-petrol-signs

https://github.com/WiseLord/volmatrix

 http://www.marwedels.de/malte/ledmatrix/index.php

 http://harbaum.org/till/ledmatrix/index.html