We are trying to do some authentication of digital content
(m-coupons) using barcodes.
So we will be displaying the m-coupon with a barcode
on the java enambled mobile phone screen and barcode
scanner at the point of sales would read the barcode.

we were wondering if there are any issues with reading barcodes
from a handphone screen. what about refraction and reflection
Do we need optical barcode scanners or the normal laser ones
would be fine?

Also, does it also work for old phone which had back light concept
and not pixel light?

Would appreciate any information in this regard.
Sourabh Sharma