lcd4linux-users

[lcd4linux] help Wiring a large display?

[Ognjen B. <og...@ma...>]

HI all,

I just bought a 4x40 LCD display to wire up for lcd4linux, and i want to 
ask a few questions as this is my first experience with such a large lcd.

First things first, the LCD does not have 14 or 16 pins, but 18 (not 
including two for the backlight), what are the extra 4 pins for? i 
couldnt find any schematics for this display either on lcd4linux or 
lcdproc. Are the  schematics the same for all lcd sizes regardless of 
number of controllers in use?

I read about the dual enable lines, is there a schematic for this wiring 
anywhere?

Does this lcd require 8-bit mode? or can it use any of the others as 
well (4-bit, winamp, etc...)

Also the backlight has its own dedicated connector on it with an 'A' and 
a 'K' on each side and a 5V+ sign in the middle (i presume this might be 
a EL backlight as opposed to a normal LED one). Whats does the A and K 
mean, and which one is the positive (dont want to fry this, it wasnt 
cheap) and does it need a resistor or something(from what i know EL 
backlights are somewhat more fragile then led's)?

And help appreciated

Re: [lcd4linux] help Wiring a large display?

[paul k. <pau...@xs...>]

Hi,

Can you provide some details about the display. Manufacturer, type 
number etc?

Paul

Ognjen Bezanov wrote:

> HI all,
>
> I just bought a 4x40 LCD display to wire up for lcd4linux, and i want 
> to ask a few questions as this is my first experience with such a 
> large lcd.
>
> First things first, the LCD does not have 14 or 16 pins, but 18 (not 
> including two for the backlight), what are the extra 4 pins for? i 
> couldnt find any schematics for this display either on lcd4linux or 
> lcdproc. Are the  schematics the same for all lcd sizes regardless of 
> number of controllers in use?
>
> I read about the dual enable lines, is there a schematic for this 
> wiring anywhere?
>
> Does this lcd require 8-bit mode? or can it use any of the others as 
> well (4-bit, winamp, etc...)
>
> Also the backlight has its own dedicated connector on it with an 'A' 
> and a 'K' on each side and a 5V+ sign in the middle (i presume this 
> might be a EL backlight as opposed to a normal LED one). Whats does 
> the A and K mean, and which one is the positive (dont want to fry 
> this, it wasnt cheap) and does it need a resistor or something(from 
> what i know EL backlights are somewhat more fragile then led's)?
>
> And help appreciated
>
>
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>
>

Re: [lcd4linux] help Wiring a large display?

[Ognjen B. <og...@ma...>]

The display only has "WH-4004A" printed on the back of it, after 
googling about I came across winstars site

The datasheet can be found here (PDF format) 
http://ogijeovde.homelinux.net/crap/WH4004A.PDF

Sorry for bugging the mailinglist,  but the datasheet pretty much 
answers my questions =)

I should remember in future to look for datasheets first before asking 
the mailing list....

Of course if there are any pre-built and tested schematics for this LCD 
they would be welcome, rather then having to make one myself


Oh yeah, and can anyone tell me what a negative voltage output would be 
used for? (pin 16 on my LCD), is this required for the LCD to work?

paul kamphuis wrote:

> Hi,
>
> Can you provide some details about the display. Manufacturer, type 
> number etc?
>
> Paul
>
> Ognjen Bezanov wrote:
>
>> HI all,
>>
>> I just bought a 4x40 LCD display to wire up for lcd4linux, and i want 
>> to ask a few questions as this is my first experience with such a 
>> large lcd.
>>
>> First things first, the LCD does not have 14 or 16 pins, but 18 (not 
>> including two for the backlight), what are the extra 4 pins for? i 
>> couldnt find any schematics for this display either on lcd4linux or 
>> lcdproc. Are the  schematics the same for all lcd sizes regardless of 
>> number of controllers in use?
>>
>> I read about the dual enable lines, is there a schematic for this 
>> wiring anywhere?
>>
>> Does this lcd require 8-bit mode? or can it use any of the others as 
>> well (4-bit, winamp, etc...)
>>
>> Also the backlight has its own dedicated connector on it with an 'A' 
>> and a 'K' on each side and a 5V+ sign in the middle (i presume this 
>> might be a EL backlight as opposed to a normal LED one). Whats does 
>> the A and K mean, and which one is the positive (dont want to fry 
>> this, it wasnt cheap) and does it need a resistor or something(from 
>> what i know EL backlights are somewhat more fragile then led's)?
>>
>> And help appreciated
>>
>>
>> -------------------------------------------------------
>> SF email is sponsored by - The IT Product Guide
>> Read honest & candid reviews on hundreds of IT Products from real users.
>> Discover which products truly live up to the hype. Start reading now.
>> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
>> _______________________________________________
>> Lcd4linux-users mailing list
>> Lcd...@li...
>> https://lists.sourceforge.net/lists/listinfo/lcd4linux-users
>>
>>
>
>
>
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real users.
> Discover which products truly live up to the hype. Start reading now.
> http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click
> _______________________________________________
> Lcd4linux-users mailing list
> Lcd...@li...
> https://lists.sourceforge.net/lists/listinfo/lcd4linux-users
>
>