| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the necessity of improving luminance of a light source accompanied by power consumption increase and achieve a bright display by improving light use efficiency. SOLUTION: In this method, a polarized light controlling layer 2 which varies a vibrating plane of linearly polarized light is installed on a light emitting side of a light guiding plate 1 which emits the incident light, which is entered from the side thereof, from either upper surface or lower surface, and the parallel degree of the vibrating plane of the linearly polarized light, which is emitted from light guiding plate 1, to a transmission axis of the polarizing plate 3 which is installed on the light guiding plate 1 side of a transmission display element 4 is improved through the polarized light controlling layer 2 and the linearly polarized light enters the polarizing plate 3. Thereby, the absorption loss due to the polarizing plate 3 can be suppressed so that the transmittance of the polarizing plate 3 can be increased to improve the display brightness of the display element. Comparing with the conventional method, if the display brightness is same, the luminance of the light source can be decreased to reduce the power consumption and enhance the life of the battery in the display element of the battery power supply type such as portable personal computers. |
