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'[EE]: LCD question'
2003\06\20@045611 by john chung

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Hi there,

   I just managed to get my hands on some LCDs. The LCDs are from:
http://www.bgmicro.com

The information on the LCD are here:
http://www.bgmicro.com/prodinfo.asp?sid=981018518518519E-02202157192162&prodid=LCD1022&page=1&cri=LCD&stype=2

The datasheet is on the left link.
The name of the pdf is "2x16el.pdf"


Actually I have 2 questions.

1) How easy is it to interface with it. Data bus is 4 -bit. Is it much harder to talk to the LCD?
2) Do I really need an EL inverter to make it function. I don't really need the backlight function.
   Is there any good tutorial on EL inverter if I need it some day?

Sorry about these trivial questions. This is the first time I am interfacing with the LCD.

Appreciate your help,
John

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2003\06\20@052640 by Bob Axtell

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I've ONLY used 4-bit mode. It works so well, it can be driven from a PC
parallel port.

--Bob

At 05:01 PM 6/20/2003 +0800, you wrote:
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2003\06\20@053904 by john chung

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Bob,

   Do you have any experience with El inverters. Do I need them for this LCD component.

Please advice,
John


Bob Axtell wrote:

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2003\06\20@054523 by Jinx

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> The datasheet is on the left link.
> The name of the pdf is "2x16el.pdf"

Not the best data sheet, especially for someone who hasn't
used an LCD before. But the info is in there. It looks like a
standard HD44780-compatible LCD. The d/s for that is
much better

> 1) How easy is it to interface with it. Data bus is 4 -bit.
> Is it much harder to talk to the LCD?

It isn't harder or easier than 8-bit. Just needs a little more
code. Once the routines are written then it's pretty trivial
to write anything anywhere on the screen whether it's 4 or
8 bits. A 4-bit i/f uses fewer port lines, but data has to be
written in two 4-bit chunks, so transfer takes longer. An 8-bit
i/f obviously uses more port lines but data can be displayed
faster. Although typically data will go from PIC to screen in
< 100us even in 4-bit mode. The data buss can be used
with shift registers or latches so you could multi-task the
PICs port pins or use less of them, but a plain wiring would
need 11 pins for 8-bit i/f and 7 for 4-bit

> 2) Do I really need an EL inverter to make it function.

No

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2003\06\22@214640 by john chung

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Thanks to all that help me solve this puzzle :)

Thanks guys,
John

Jinx wrote:

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