Hi Allen,

What brand of touchscreen are you using?  What is the controller/type?

Resistive screens will degrade over time (the time depends on the manufacturer) and will need to be re-calibrated.

Other screens require a hardware calibration/linerization to be performed.

Best regards,

Erick


> We at TA are using the canned touchscreen calibration routine that comes
> with v. 6.2.1.
> 
>  
> 
> The issue we are having is that with some touchscreen panels, when we do
> the calibration routine, the coordinates of the button on the
> touchscreen become shifted to the right relative to the button displayed
> on the screen.  This causes the wrong button to be activated when the
> user selects a button option.
> 
>  
> 
> The effect seems to be worse at the bottom of the screen than at the
> top.
> 
>  
> 
> I was wondering if I could find out what the calibration algorithm is so
> that we can see if there's something we can do hardware wise to keep
> this from happening.  The touchscreen and display are secured together
> in a fixture so it isn't mechanical movement.
> 
>  
> 
> It doesn't do it to all touchscreens, but we would like to reduce the
> occurrences as much as possible.
> 
>  
> 
> Any help you can provide will be appreciated.
> 
>  
> 
>  
> 
>  
> 
> Allen
>