Patent ID: 8388157

Claim:
A light guide sheet comprising: a material sheet having a film shape, the material sheet being configured to introduce therein light from a first light emitter and light from a second light emitter; a first illumination portion provided on the material sheet, the first illumination portion diffusing the light from the first light emitter; and a second illumination portion provided on the material sheet, the second illumination portion diffusing the light from the second light emitter, wherein the material sheet has a first slit portion between the first illumination portion and the second illumination portion, the first slit portion including two or more first slits and a bridge, each of the first slits having substantially a strip shape provided therein, the first slit portion being provided around the first illumination portion, and one of the two or more first slits has a first end and a second end, said one of the two or more first slits bends at a bending point, said one of the two or more first slits having a first portion extending from the first end to the bending point and a second portion extending from the second end to the bending point, the bending point of said one of the two or more first slits is opposed to an end of another of the two or more first slits in a certain direction, said another of the two or more first slits has a portion extending from the end of said another of the two or more first slits in parallel to the second portion of said one of the two or more first slits, and the first portion of said one of the two or more first slits extends beyond the bridge and the end of said another of the two or more first slits.