| 摘要 |
PURPOSE: To provide a bright diffusion screen having no reflection of circumference light and a high contrast and a liquid crystal display device with high display dignity using it. CONSTITUTION: In a diffusion screen, an opening area of light guide part 1 through which a display light is passed is made larger at the side of an incidence plane 5 of the display light, and a light absorption material is arranged inside of a base material part 2 surrounding it or at the side of a observation plane 4. This diffusion screen is arranged at the front of a liquid crystal panel, and a back light source is made to be virtually a parallel light. Because the area of a light absorption part is large at the side of the observation plane 4, the absorption efficiency of the circumference light can be made excellent and to display in the high contrast can be made possible, and also because the opening area of the light guide part 1 is large at the side of the incident plane 5 of the display light, the use efficiency of the display light from the back becomes excellent. Because the characteristics in the specific field angle of the liquid crystal panel and the diffusion screen, the higher contrast display can be made. |
