Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
If you want to do this in real time with opaque and shadows at a colored HD TV screen then your microcontroller is not the right choice.
If it is an 8 character alphanumeric display then it is an easy task.
You see it can't be answered with your given information.
It additionally depends on the uused display (character count, interface, resolution ....) and on your controller parameters (memory, clock frequency....)