Reply by Tom Digby July 13, 20052005-07-13
Lou C wrote:
>>LCD crystals require a AC drive signal, DC
would kill them.
> 
> 
> Really?  What do you mean "kill them"?  I would think an improper
DC bias 
> MIGHT make the segments non-viewable, but not destroy the LCD.

I've heard that sustained DC across an LCD unit does some kind of 
electrolysis thing to the electrodes.  With AC the electrolysis effects 
during any half-cycle cancel out on the next half-cycle before any harm 
is done, but with DC there may be a point of no return where the display 
is ruined.

I would expect at least some LCD manufacturers to have something about 
this up in their Web stuff.  If they don't, some engineering schools might.


-- 
                      Tom Digby
                      http://www.well.com/~bubbles/

Beginning Microcontrollers with the MSP430

Reply by July 13, 20052005-07-13
Hi guys,

 

Firts off all, thansk for your're replies. Secondly as mentioned I could not
get my lcd working with an MSP so I choose for renesas, sorry. And that did
the trick for me very easy. But as far as understanding the whole topic..
nah. Sorry.

 

As far I can see the bias is indeed for setting the contrast but that is in
conjuction with the waveform. And that is where Ti could not help me,
unortunatly.

 

But as mentioned thanks.

 

b.t.w al thanks for the document I'll go though it and hopefully this will
answer my questions. Thanks guys.

 

martijn 

 

  _____  

From: msp430@msp4... [mailto:msp430@msp4...] On Behalf Of
Onestone
Sent: woensdag 13 juli 2005 14:41
To: msp430@msp4...
Subject: Re: [msp430] OT: LCD BIAS understanding

 

Well according to some texts I have it will destroy the crystals,  which 
is a reasonable interpretation of making the pixels non viewable I 
guess. hey, I didn't profess to be an expert.

Al

Lou C wrote:

>>LCD crystals require a AC drive signal, DC
would kill them.
>>    
>>
>
>Really?  What do you mean "kill them"?  I would think an improper
DC bias 
>MIGHT make the segments non-viewable, but not destroy the LCD.
>
>Lou
>
>
>
>
>.
>
> 
>>  Terms of Service. 

 

  _____  






Reply by Onestone July 13, 20052005-07-13
Well according to some texts I have it will destroy the crystals,  which 
is a reasonable interpretation of making the pixels non viewable I 
guess. hey, I didn't profess to be an expert.

Al

Lou C wrote:

>>LCD crystals require a AC drive signal, DC
would kill them.
>>    
>>
>
>Really?  What do you mean "kill them"?  I would think an improper
DC bias 
>MIGHT make the segments non-viewable, but not destroy the LCD.
>
>Lou
>
>
>
>
>.
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>  
>


Reply by Lou C July 13, 20052005-07-13
>LCD crystals require a AC drive signal, DC would kill them.

Really?  What do you mean "kill them"?  I would think an improper DC
bias 
MIGHT make the segments non-viewable, but not destroy the LCD.

Lou



Reply by Onestone July 12, 20052005-07-12
I've just uploaded this to the files area, since a few people seem 
interested.

Al

Jonathan Kirwan wrote:

>On Tue, 12 Jul 2005 23:07:51 +0930, Al wrote:
>
>  
>
>><snip>
>>For a more complete view download a tech manual, such as g321ev. pdf 
>>    
>>
>>from an Lcd manufaturer such as Seiko.
>
>Do you have a working link?  I'm interested in reading a detailed
>description.
>
>(Just used google without much success -- no, I will not screw around
>with alldatasheet.com to even find out.)
>
>Thanks,
>Jon
>
>
>.
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>
>  
>


Reply by Jonathan Kirwan July 12, 20052005-07-12
On Tue, 12 Jul 2005 15:51:44 -0300, augusto wrote:

>http://www.tiking.com/compment.asp?compment=SII\G321EV.pdf55555555G3
>
>click in the first button 

I clicked on a number of buttons there.  At first, I had no luck.
Here is one of the pages it took me to, that looked interesting
though:

  http://www.tiking.com/fenlei.asp?lei=G3

One of the links takes me to an error page, namely:

  http://www.tiking.com/error.asp

But after thinking about this, I realized that it is probably because
I have my security set rather high and I don't permit cookies from
anyone other than specific sites I permit, when I care to do so.  So I
changed this, and that seemed to make it work.

Thanks,
Jon

Reply by augusto einsfeldt July 12, 20052005-07-12
http://www.tiking.com/compment.asp?compment=SII\G321EV.pdf55555555G3

click in the first button 


-----Original Message-----
From: msp430@msp4... [mailto:msp430@msp4...] On Behalf Of
Jonathan Kirwan
Sent: Tuesday, July 12, 2005 3:18 PM
To: msp430@msp4...
Subject: Re: [msp430] OT: LCD BIAS understanding


On Tue, 12 Jul 2005 19:06:17 +0200, you wrote:

>Hi,
>
>http://www.google.com/search?q=g321ev.pdf
>
>Regards,

I did that and checked the links.  nada.

Jon


.

 
Yahoo! Groups Links



 



-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.323 / Virus Database: 267.8.12/46 - Release Date: 11/7/2005
 


Reply by Jonathan Kirwan July 12, 20052005-07-12
On Tue, 12 Jul 2005 19:06:17 +0200, you wrote:

>Hi,
>
>http://www.google.com/search?q=g321ev.pdf
>
>Regards,

I did that and checked the links.  nada.

Jon

Reply by rolf...@... July 12, 20052005-07-12
Hi,

http://www.google.com/search?q=g321ev.pdf

Regards,

Rolf

msp430@msp4... schrieb am 12.07.05 18:29:29:
> 
> On Tue, 12 Jul 2005 23:07:51 +0930, Al wrote:
> 
> ><snip>
> >For a more complete view download a tech manual, such as g321ev. pdf 
> >from an Lcd manufaturer such as Seiko.
> 
> Do you have a working link?  I'm interested in reading a detailed
> description.
> 
> (Just used google without much success -- no, I will not screw around
> with alldatasheet.com to even find out.)
> 
> Thanks,
> Jon
> 
> 
> .
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 



Reply by Jonathan Kirwan July 12, 20052005-07-12
On Tue, 12 Jul 2005 23:07:51 +0930, Al wrote:

><snip>
>For a more complete view download a tech manual, such as g321ev. pdf 
>from an Lcd manufaturer such as Seiko.

Do you have a working link?  I'm interested in reading a detailed
description.

(Just used google without much success -- no, I will not screw around
with alldatasheet.com to even find out.)

Thanks,
Jon