Tag Archives: prototype

Driving an LCD shutter with a PIC 16F917

lcd_off lcd_on

This is a prototype I put together using an LCD shutter from a 5 dollar novelty keychain. I’m driving the shutter using the built in LCD segment driver on a PIC 16F917. The ultimate goal of this is to investigate the feasibility of adding stereoscopic support to my graphics engine by triggering the LCD with a photo sensor in the corner of the screen. Every even frame would have a light square in the corner and a black square in the odd frames.

The switching response in the LCD seems pretty poor. In the video below I’m strobing it ~18Hz. The red LED on the bread board is switched on when the LCD is dark. In this test the LED shines right through when it should be blocked. I don’t know whether or not the issue is with how the shutter is being driven or if it’s a response time issue. I’ll have to do more testing to figure that out. I don’t have time to move forward with this so I’m going to have to shelve it for now…