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Subject: Re: Electroluminescent displays
References: <9U8E9.158237$oRV.firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: Sun, 24 Nov 2002 19:46:46 GMT
Organization: AT&T Broadband
Date: Sun, 24 Nov 2002 19:46:46 GMT
John Fields wrote:
> In my experience changing the voltage changes the brightness, while
> changing the _frequency_ changes the color.
Is this last effect only a subtle one? I hadn't noticed it with our
products. They use a little three winding transformer in a self
oscillating circuit where the operation frequency depends on the
capacitive loading from the EL panels. We have a range of products
containing various sizes and numbers of EL backlights.
Thus, for the same transformer, frequency ranges from about 300 Hz to
700 Hz. Input voltage to the oscillator circuit must be controlled to
maintain brightness so the displays look the same when different models
of these products are used side-by-side. But I hadn't ever noticed a
color variation. Hmmm... Maybe I should have a closer look.
Over what frequencies have you noticed this effect with your displays?
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