When you type a lot of text, you have to move your eyes from keyboard to screen and back. It can be tedious.
Just connect this "LCD helper" to USB port and place small LCD screen next to the keyboard. Now you can see the part of computer's screen (cursor and small surrounding area) right next to your fingers, which is much better.
There is the running program on PC that constantly captures part of screen and sends it to "LCD helper" via USB. Device has LPC 2148 ARM7 based microprocessor (by NXP/ Philips) with USB module (first attempt was with PIC18F4550, but it is quite slow). And microcontroller sends picture to the LCD screen.
Exemple of what you can see on LCD screen:
Copyright © Alexander Pradidenko