Patent ID: 8848115

Claim:
A 3D image signal controlling method to control a 3D image display device, said method comprising: preparing a 3D image display device, said 3D image display device comprising a backlight module, a first linear polaroid disposed in front of said backlight module, a first liquid crystal layer disposed in front of said first linear polaroid, a second linear polaroid disposed in front of said first liquid crystal layer, a second liquid crystal layer disposed in front of said second linear polaroid to change a linear polarization orientation of image signals, and a retarding layer disposed in front of said second liquid crystal layer to transform said linear polarization orientation into a circular polarization orientation, said first linear polaroid having a first polarization orientation, said second linear polaroid having a second polarization orientation; inputting a left eye image into said first liquid crystal layer, turning off said backlight module and switching gray levels of said second liquid crystal layer to a minimum gray level during (4N-3)th time interval, wherein N is natural number; stopping inputting said left eye image, turning on said backlight module and remaining said gray levels of said second liquid crystal layer as said minimum gray level during (4N-2)th time interval; inputting a right eye image into said first liquid crystal layer, turning off said backlight module and switching said gray levels of said second liquid crystal layer to a maximum gray level during (4N-1)th time interval; and stopping inputting said right eye image, turning on said backlight module and remaining said gray levels of said second liquid crystal layer as said maximum gray level during (4N)th time interval.