| 摘要 |
PURPOSE: To change the light emitting state of a prism sheet and to obtain such an image of good image quality that is bright and easily seen to give no fatigue to the observer by using a film having a light-diffusing performance in a specified range. CONSTITUTION: An image quality improving film 21 is disposed between a liquid crystal display element 11 and a prism sheet 18. The film 21 essentially consists of a colorless transparent plastic material and contains at least one kind of spherical light-diffusing particles. The film 21 has >=80% transmittance for all rays and 5 to 15 deg. diffusion half-power angle of incident light beams at a right angle. As for the plastic material as the main component, for example, polymethyl methacrylate, polycarbonate, polyvinylchloride, polyvinyl alcohol and polyester can be used. As for the spherical light-diffusing particles, plastic particles or glass particles having 1-20μm average particle size are used. The compsn. of these materials is formed into a film of 30-300μm average thickness to obtain the image quality improving film 21. |
