2008/11/6 gardenyu : > http://www.ubasics.com/driving_static_lcds > > I am a little confused. Can I use a similar program Adam wrote to run 3 digits on a 4 digit LCD? When we talk about multiplexed displays we mean displays with more than one common per segment. The 4 digit displays with 40 pins sold by lumex and varitronix are static LCDs (not multiplexed), so you can use them the same way as the 3 digit in my article. Tie unused segments to COM. > Another question is: Since these LCD does not have backlight. I did some research and thought that I can use a transflective LCD with some little surface mount LEDs at the back of the LCD as backlight. These LEDs should have a very wide viewing angle, very small lumen. Correct me if I'm wrong. You can put LEDs directly behind the display, but without a diffuser you'll get uneven lighting. Jinx did some experiments with backlighting which you can read about (and see picutres of) here: http://home.clear.net.nz/pages/joecolquitt/led+lcd.html -Adam -- Please rate and vote for my contest entry: http://mypic32.com/web/guest/profiles?profileID=50331 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist