Patent ID: 9053672
Filing Date: 2015-06-09
Classification: G09G,H04N

Abstract:
1. A stereoscopic image display device comprising: a liquid crystal panel portion to be horizontally scanned sequentially from an upper part to a lower part of a liquid crystal panel screen based on a stereoscopic image signal, thereby varying a transmittance of light depending on a gray scale of said stereoscopic image signal; a light guiding portion provided on a back face side of said liquid crystal panel portion for receiving light from a light source portion and diffusing said light to form a uniform surface light source; a light detecting portion for detecting a light intensity of light emitted from said light guiding portion; and a light source controlling portion for controlling a light emission intensity value of said light source portion in such a manner that a light detection value of said light detecting portion is equal to a preset reference light detection value, wherein said light source portion includes a plurality of back lights provided corresponding to respective regions obtained by virtually dividing said liquid crystal panel screen into a plurality of parts, said plurality of back lights have a light emission intensity controlled based on said light emission intensity value and have ON and OFF operations controlled in response to a light emission driving signal, said light emission driving signal is constituted to sequentially turn ON said plurality of back lights synchronously with said stereoscopic image signal and to turn ON said plurality of back lights at the same time in a predetermined timing, and is constituted to individually control a light emission period for said plurality of back lights based on image information about said stereoscopic image signal, and said light detecting portion is controlled to carry out a detecting operation in such timing as to turn ON the back lights at the same time based on a light detection gate signal.