Perhaps screened background means faded transparent background made by reducing its opacity.

Dan rasa penasaran kita berkepanjangan lantaran terlihat sebuah telapak tangan putih yang membayang tipis entah di latar depan atau latar belakang.

http://nirwandewanto.blogspot.com/2009_01_01_archive.html

BOLA DUNIA yang lebih besar membayang-bayangi di latar belakang.

http://id.scribd.com/doc/96557627/LakonWAR

Dalam konteks ini, saya mengusulkan:
screen = selaput
screened = berselaput

Rujukan:
A pantograph is a screen that is printed in the background of a document. It is usually printed in a lighter color of ink and made up of a design that is hard to copy or scan. It can also be custom designed using a company's name or logo. Although it adds to the document's design, the main purpose of the pantograph is to help make the document hard to duplicate by someone trying to forge or alter the document. The newer scanners and copiers can now duplicate pantographs so that it is hard to distinguish the copy from the original. Other security features should be used along with a pantograph screen to make the document more secure.
http://www.softsource.ae/security/security-printing.html

Optical Deterrent Technology™ is a security pantograph in a screened background that is designed to distort the copy from the
original document when duplication is attempted on black and white or color copiers. While this feature is not guaranteed to work on
all copiers, it is effective on many popular copiers.
http://www.mhcdocumentexpress.com/content/fulldocsec.pdf

Apakah mungkin bahwa yang dimaksud di sini adalah latar belakang yang dicetak menggunakan teknik screen printing atau silkscreen printing
http://en.wikipedia.org/wiki/Screen_printing
Teknik mencetak ini di Indonesia dikenal dengan istilah 'sablon'