Patent ID: 7651235
Filing Date: 2010-01-26
Classification: G02F,G09G

Abstract:
1. A planar light source device configured to illuminate a transmissive liquid crystal device having a display region configured of pixels arrayed in a two-dimensional matrix from the rear side, said planar light source device comprising: P×Q planar light source units corresponding to P×Q display region units assuming the display region of said liquid crystal display device is divided into P×Q hypothetical display region units; wherein a light source provided to each planar light source unit has j and wherein the light-emitting device units in each planar light source unit are classified into at least a first light-emitting device unit and a second light-emitting device unit; and wherein each light-emitting device unit is configured of i (where i is an integer of 1 or greater) red light-emitting devices which emit red light, 2i green light-emitting devices which emit green light, and i blue light-emitting devices which emit blue light; and wherein, at each planar light source unit; (A) red light-emitting devices are classified into red light-emitting devices having a first luminance value, and red light-emitting devices having a second luminance value lower than that of the first luminance value, (B) green light-emitting devices are classified into green light-emitting devices having a first luminance value, and green light-emitting devices having a second luminance value lower than that of the first luminance value, (C) blue light-emitting devices are classified into blue light-emitting devices having a first luminance value, and blue light-emitting devices having a second luminance value lower than that of the first luminance value, (D) the classification category of the luminance value of the red light-emitting devices making up the first light-emitting device unit differs from the classification category of the luminance value of the red light-emitting devices making up the second light-emitting device unit, (E) the 2i green light-emitting devices making up each green light-emitting device unit are configured of green light-emitting devices having a first luminance value, and green light-emitting devices having a second luminance value that is different from the first luminance value, (F) the classification category of the luminance value of the blue light-emitting devices making up the first light-emitting device unit differs from the classification category of the luminance value of the blue light-emitting devices making up the second light-emitting device unit, and (G) said first light-emitting device unit and said second light-emitting device unit are placed in at least twofold rotational symmetry.