Patent ID: 8144397

Claim:
A laminated sheet, in which a plurality of screen sheets are stacked, the laminated sheet comprising: a multilayer sheet A including two or more layers with different linear expansion coefficients; and a single sheet B which is a sheet other than the multilayer sheet A, wherein at least in a temperature range from 10° C. to 30° C., expressions (*1), (*2) and (*3) are satisfied, and, when all sheets are stacked, either (i) or (ii) below applies: [ E ⁢ ⁢ 1 ]  ⁢ θ A  > 0 ( * ⁢ 1 ) - 2 ≤ δ AB ≤ 10 ⁢ ⁢ mm ( * ⁢ 2 ) δ AB = E A ⁢ t A 3 ⁢ δ A + E B ⁢ t B 3 ⁢ δ B E A ⁢ t A 3 + E B ⁢ t B 3 ( * ⁢ 3 ) where (i) a viewing-side sheet is convex on an image light source side, and an image light source-side sheet is convex on the viewing side, and (ii) the viewing-side sheet and the image light source side-sheet are both convex on the image light source side, and a curvature of the viewing-side sheet is greater than a curvature of the image light source-side sheet, where, Δθ A : a rate of change in a warping δ A of the multilayer sheet A due to changes in the temperature (mm/° C.), δ AB : a warping of the entirety of the sheets when all sheets are stacked, and the four corners thereof are fixed without a frame (mm: positive figures are the convex direction on the image light source side), δ A : a warping of the multilayer sheet A (mm: positive figures are the convex direction on the image light source side), δ B : a warping of the sheet B (mm: positive figures are the convex direction on the image light source side), E A : Young's modulus of the multilayer sheet A (Pa), E B : Young's modulus of the sheet B (Pa), t A : a thickness of the multilayer sheet A (mm), and t B : a thickness of the sheet B (mm).