| 摘要 |
PURPOSE:To improve the luminance of a screen and reduce the power consumption by constituting an element, which obtains a linearly polarized light, of a grid polarizer which separates an incident natural light into two polarized components orthogonal to each other and an element which rotates the plane of polarization of one luminous flux at 90 deg. and leading two polarized components to a liquid crystal panel and allowing them to contribute to the luminance of the screen. CONSTITUTION:The natural light emitted from a light source 11 is transmitted through a diffusing plate 1 and is made incident on a grid polarizer 2, and the polarized component perpendicular to a metallic grating of this light is transmitted through but the other polarized component is reflected. The reflected light is transmitted through a quater-wave plate 10 to become a circularly polarized light and is reflected on a mirror 12 and is transmitted through the quarter-wave plate 10 again to be returned to a linearly polarized light. At such a time, the plane of polarization is rotated at 90 deg. from the incidence state and the light is transmitted through the polarizer 2. Thus, two polarized components orthogonal to each other are made incident on a liquid crystal panel 8 after their planes of polarization are matched to each other. The light whose polarization direction is modulated by the liquid crystal panel 8 is made incident on an analyzer 9, and the polarization direction is allowed to correspond to light and darkness to display the light. Thus, polarized components are used to reduce the loss in the polarizer. |
