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Browse Prior Art Database

Viewing Angle Limitation Method for Displays

IP.com Disclosure Number: IPCOM000123106D
Original Publication Date: 1998-May-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 21K

Publishing Venue

IBM

Related People

Inoue, H: AUTHOR

Abstract

Disclosed is a method for limitation of viewing angle for various displays.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Viewing Angle Limitation Method for Displays

   Disclosed is a method for limitation of viewing angle
for various displays.

   A basic structure of this method is shown in the
following Figure.  The film, that is composed of transparent
substance and untransparent substance, is placed on a panel.

   Only the lay that angle, theta, is less than arctan(a / L)
can transit the film, and n, theta, and phi satisfy the Snell's low,
sin(phi) = n*sin(theta).  In the result, nobody can see the display
from the direction that angle, phi, is more than arcsin(n
sin(arctan(a / L))).  The method can prevent to be looked furtively
from an off angle direction, and realize a security panel.