| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a contrast improvement sheet having an adhesive layer capable of following and adhering to the surface recesses of the contrast improvement sheet even without autoclave treatment. <P>SOLUTION: In a lens sheet, lens parts 121, each having a trapezoidal cross-sectional shape, are arranged at predetermined intervals, a wedge part 122 between the adjacent lens parts is filled with a material identical with or different from that of the lens part 121, and the wedge part 122 has its apex on an observer side or a video source side and has a light absorption effect. On an observer side surface of the lens sheet, a lower bottom surface 122a which is the apical surface of the wedge part is recessed with a depth d relative to the apical plane surface of the lens part. The lens sheet is laminated to an observer side base sheet via an adhesive layer on the observer side surface of the lens sheet to constitute a contrast improvement sheet. The ratio of a storage elastic modulus E' of the adhesive layer at 20°C to that at 50°C, E'(20°C)/E'(50°C), is 1.7 or more and less than 2.5. <P>COPYRIGHT: (C)2012,JPO&INPIT |
