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From: "Jack B. Pollack"
Subject: LCD Question
Date: Fri, 1 Nov 2002 08:23:13 -0500
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I have several questions about a LCD display in a portable clock that I
There are 13 'pad' connections on the PC board that connect the LCD display
to the PCB and 'blob chip'. If I look at these connections with a scope
there is a square wave on each of them.
The display has no electronics in it, how is the data transferred to the
display and decoded? How are the individual segments on the display
The second question is about the LCD backlight:
There is a thin film (looks like a piece of paper) with 2 contacts on it.
When 50V AC is applied the film glows blue and backlights the LCD. I would
like to find out more about this type of backlight technology and how to
build a similar driver circuit for the backlight.
Any insight would be appreciated.
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