| 摘要 |
PROBLEM TO BE SOLVED: To widen an observation area and to improve brightness by obtaining three-sheet constitution of Fresnel lens sheet, a lenticular lens sheet(A) and another lenticular lens sheet (B) which are disposed so that the surface of the lens of the lenticular lens sheet (B) may be opposed to a light shielding layer on an opposite side to the lens group of the lenticular lens sheet (A). SOLUTION: The surface of the lens 11 of the Fresnel lens sheet 10 is disposed to be opposed to the surface of the lens 21 group of the lenticular lens sheet (A) 20. Furthermore, another lenticular lens sheet (B) 30 different from the sheet (A) 20, having action to refract projected light in a horizontal direction and constituted by arraying the cylindrical lens 31 group long lengthwise in a vertical direction is disposed. Then, the screen has three-sheet constitution that the sheet (A) 20 and the sheet (B) 30 are disposed so that the array of the lens group of the sheet (B) 30 may be parallel with that of the sheet (A) 20 and the surface of the lens 31 group of the sheet (B) 30 may be opposed to the light shielding layer 25 on the opposite side to the lens group of the sheet (A) 20.
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