piclist 1998\10\07\223553a >
Thread: LCD Problem
www.piclist.com/techref/lcds.htm?key=lcd
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face BY : Peter Schultz email (remove spam text)



Hi,
Vo voltage for the LCD contrast adjustment, You need a 10-5 KOhm trimmerpot
between Vdd and Vss the wiper goes to
Vo. There are more tricky circuits to control the contrast ( contrast is
very temperature dependent ) but this is the easiest way to check. Do not
connect any data line, if your PS rising time is OK it  will reset itself
and adjusting the pot You must see all dots in one line are on.
The reason of using different pins for the background LCD because they usual
current is 100-300 mA and most of the designers do not want to dissipate
that thru the 5V power supply .
I have Optrex data sheet better discription of the data lines. Let me know
and I will fax You,
Cheers,
Peters

<000001bdf264$51e2a060$362aa8c0@jupiter.dvp.com> 7bit

In reply to: <3.0.3.32.19981007182414.007d7510@postoffice2.mail.cornell.edu>
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