LCD contrast Control negative STN

[Joe G \(Home\)]

Hi All,

We are changing from std Yellow positve STN to Blue/White negative STN.

Does the contrast voltage pin work in opposite direction between postive
and negative STN?

Eg
For deeper contrast on positive STN : Contrast Voltage reduced
For deeper contrast on negative STN Contrast Voltage increased

Are these statements above correct?

Thanks in advance
Joe

 

[Michael A. Terrell]

Hi All,

We are changing from std Yellow positve STN to Blue/White negative STN.

Does the contrast voltage pin work in opposite direction between postive
and negative STN?

Eg
For deeper contrast on positive STN : Contrast Voltage reduced
For deeper contrast on negative STN Contrast Voltage increased

Are these statements above correct?

What do the datasheets say?


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Joe G \(Home\)]

Sorry Michael,

This looks like a reply but realy it's the 1st post, as the 1st one didn't
go through.

So I am looking for replies.

Sorry to confuse.

Joe

 

[SparkyGuy]

Sorry Michael,

This looks like a reply but realy it's the 1st post, as the 1st one didn't
go through.

So I am looking for replies.

Sorry to confuse.

Joe

??

What do the datasheets say?

 

[Joe G \(Home\)]

What do the datasheets say?

I am waiting for the data sheets from the manufactuer that could be some
time.

Hence my email hear about -ve STN

Joe

 

[Gary Tait]

I am waiting for the data sheets from the manufactuer that could be some
time.

Hence my email hear about -ve STN

Joe

Why do you need to know so soon?
If you are doing a PCB design now, an want consitancy in operation, just
design the pot for either way. It is not that hard. Same for the code if
you are doing it from your host micro, but have a dip-switch, jumper, or
option diode to select positive or negative.

 

[Joe G \(Home\)]

<snip>
Tto improve my learning and experinces other people have had.

Joe