Title:
SCREEN INFORMATION PROTECTION DEVICE AND SCREEN INFORMATION PROTECTION METHOD
Document Type and Number:
Japanese Patent JP2009258213
Kind Code:
A
Abstract:
To control leakage of screen information due to leaked electromagnetic waves.
An adjustment part 12 applies a white signal to the brightness of each pixel constituting a screen, or the brightness of the pixel is linearly transformed and the contrast of a display image is reduced. Thereby, the image information reproduced from the leaked electromagnetic waves becomes approximately a solid color image, and information leakage can be controlled.
Inventors:
ISHIYAMA FUMIHIKO
Application Number:
JP2008104535A
Publication Date:
November 05, 2009
Filing Date:
April 14, 2008
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G09G5/02; G06F21/60; G06F21/84; G09G3/20; G09G5/00; G09G5/10
Attorney, Agent or Firm:
Hidekazu Miyoshi
Katsuhito
Katsuhito