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Forum index » Electronix » design
Handheld Game LCD runs on AC voltage?
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ajeromin@ea.com
electronics forum beginner


Joined: 21 Jul 2006
Posts: 1

PostPosted: Fri Jul 21, 2006 2:11 am    Post subject: Handheld Game LCD runs on AC voltage? Reply with quote
I'm hacking a small LCD video game for fun, and it seems that the
preprinted (not pixels) LCD panel is being fed AC voltage. I need to
convert these signals (all .6 to .8 volts) into DC power in the
simplest way possible. Can I just stick diodes on the feeds. This'll
cut the frequency in half probably right? I want to avoid convertors,
because I need to convert 200 AC feed lines. Any suggestions?

thanks.
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Luhan
electronics forum Guru


Joined: 10 Dec 2005
Posts: 365

PostPosted: Fri Jul 21, 2006 2:28 am    Post subject: Re: Handheld Game LCD runs on AC voltage? Reply with quote
ajeromin@ea.com wrote:
Quote:
I'm hacking a small LCD video game for fun, and it seems that the
preprinted (not pixels) LCD panel is being fed AC voltage. I need to
convert these signals (all .6 to .8 volts) into DC power in the
simplest way possible. Can I just stick diodes on the feeds. This'll
cut the frequency in half probably right? I want to avoid convertors,
because I need to convert 200 AC feed lines. Any suggestions?

thanks.

A $1,000,000 life insurance policy made out to "Luhan Monat"
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slebetman@yahoo.com
electronics forum Guru Wannabe


Joined: 28 Oct 2005
Posts: 145

PostPosted: Fri Jul 21, 2006 4:02 am    Post subject: Re: Handheld Game LCD runs on AC voltage? Reply with quote
ajeromin@ea.com wrote:
Quote:
I'm hacking a small LCD video game for fun, and it seems that the
preprinted (not pixels) LCD panel is being fed AC voltage. I need to
convert these signals (all .6 to .8 volts) into DC power in the
simplest way possible. Can I just stick diodes on the feeds. This'll
cut the frequency in half probably right? I want to avoid convertors,
because I need to convert 200 AC feed lines. Any suggestions?

200 lines? Are you talking about the signal lines. If so then they do
need to be AC. Not really sine-wave AC, square waves will do. The
signals need to change polarity constantly when the pixel is "on",
turning them on-off is not good enough, you really need + and -
voltages.

That is just how LCDs work. This is to prevent the liquid crystal from
"breaking down" and being forever turned "on". If you "pull" the
crystals in just one direction then sooner or later they will
permanently "stick" to that direction. Oh, sure they will sort-of work
on pure DC, for all of 5 minutes (approximately, the only one I've
tested lasted 2 minutes). After which they will be either forever black
or forever white and nothing you do will make them display anything
else.
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