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From: ydoubleuz on 23 Apr 2008 04:55
Hi All,

Sorry if these questions irrate any one out there.

Just about to begin some works on Monochrome LCDs. I had some
experience dealing with those characters LCD driven by HD controllers.

Any info on how these LCDs work? Went through the web and most are ads
and sites selling these LCDs. Went through a couple of datasheets but
still not much details. I suppose similarly to those char LCD, there
should be a driver but cant find any info about it.

Another question is the inverter. What is it for?

ywz
From: larwe on 23 Apr 2008 07:26
On Apr 23, 4:55 am, "ydoubl...(a)gmail.com" <ydoubl...(a)gmail.com> wrote:

> Just about to begin some works on Monochrome LCDs. I had some
> experience dealing with those characters LCD driven by HD controllers.

What kind of monochrome LCDs? There are some simple LCDs with the
controller integrated on the glass. These are usually controlled over
an SPI or I2C interface. Cellphone LCDs are often this type. It's not
much more difficult than driving a character LCD, except that you have
to render the text yourself (and have your own font in ROM).

Bigger LCDs need to be supplied with data constantly from an external
controller chip. You would often select a micro with on-chip LCD
controller for such applications (a PDA type micro).

> Another question is the inverter. What is it for?

Providing high voltage to the backlight, EL or CCFL. If you are asking
about inverters I guess you are not asking about simple LCDs, since
they are usually LED backlit.

From: santech1888 on 23 Apr 2008 14:59
On Apr 23, 1:55 am, "ydoubl...(a)gmail.com" <ydoubl...(a)gmail.com> wrote:
> Hi All,
>
> Sorry if these questions irrate any one out there.
>
> Just about to begin some works on Monochrome LCDs. I had some
> experience dealing with those characters LCD driven by HD controllers.
>
> Any info on how these LCDs work? Went through the web and most are ads
> and sites selling these LCDs. Went through a couple of datasheets but
> still not much details. I suppose similarly to those char LCD, there
> should be a driver but cant find any info about it.

There are two types of chips on LCD: standard chips or programmable
chips.
With standard chips, you can manage data with serial SPI interface.
With programmable chip on glass (PCOG), you can have standalone masked
programmed ROM or OTP (One Time programmable) ROM microcontroller on
the LCD glass.

There are some information available at http://san-tech-lcd.info

From: cbarn24050 on 23 Apr 2008 15:17
On Apr 23, 9:55�am, "ydoubl...(a)gmail.com" <ydoubl...(a)gmail.com> wrote:
> Hi All,
>
> Sorry if these questions irrate any one out there.
>
> Just about to begin some works on Monochrome LCDs. I had some
> experience dealing with those characters LCD driven by HD controllers.
>
> Any info on how these LCDs work? Went through the web and most are ads
> and sites selling these LCDs. Went through a couple of datasheets but
> still not much details. I suppose similarly to those char LCD, there
> should be a driver but cant find any info about it.
>
> Another question is the inverter. What is it for?
>
> ywz

I take it you mean graphic lcds. You need a controller, some panels
have one built in, many do not. Most use the Epson SED series. Look on
their website for a datasheet.
From: Tarkin on 24 Apr 2008 02:01
ydoubleuz(a)gmail.com wrote:

> Hi All,
>
> Sorry if these questions irrate any one out there.
>
> Just about to begin some works on Monochrome LCDs. I had some
> experience dealing with those characters LCD driven by HD controllers.
>
> Any info on how these LCDs work? Went through the web and most are ads
> and sites selling these LCDs. Went through a couple of datasheets but
> still not much details. I suppose similarly to those char LCD, there
> should be a driver but cant find any info about it.
>
> Another question is the inverter. What is it for?
>
> ywz

Try here to start:
http://www.myke.com/lcd.htm
Way back when I bought his book comparing microcontrollers.
He had the info in there about the HD44780-based LCD's that is on
the site at the link.

HTH and TTFN,
Tarkin

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