|Re: Backlight option for any HP LCD Calc?|
Message #11 Posted by Paul Brogger on 26 Apr 2005, 5:13 p.m.,
in response to message #10 by Garth Wilson
You're helping me remember where my unease came from . . .
Once upon a time, I had a Sharp scientific -- a ruler-shaped LCD model. Upon disassembly, I noticed that there was no circuit board behind the LCD. I had the notion that if I cut a window in the back of the calculator and removed the reflective tape, I'd be able to see through the display.
Well, it didn't work so well. Like you say, nothing showed at all. But I had previously noticed that the front cover was a polarizing filter, and by rotating it 90 degrees, I could reverse the polarity of the display (light segments on a dark background).
So, I took another plastic LCD cover from a four-banger and put that behind my fenestrated scientific. It then worked as desired.
But I found out that my desire was misdirected: I couldn't put the calculator on a table and use it, as I now needed "backlight" to see the display clearly. I had to hold it up with a piece of white paper in the background to make it legible. Very inconvenient.
The whole experiment came to a sudden end when I sat down with the thing in my back pocket, cracking the LCD. Too bad!