Patent ID: 6969187
Filing Date: 2005-11-29
Classification: G02B

Abstract:
1. A light guiding plate for a front light mounted on a reflective display unit having a display portion, wherein the light guiding plate guides light from a light source and irradiates the light onto the display portion, the light guiding plate comprising: an incidence plane, which permits light to enter the light guiding plate; an opposite end plane opposite to the incidence plane; an exit plane facing the display portion, wherein light entering the light guiding plate through the incidence plane exits from the exit plane toward the display portion; and a reflection-exit plane opposite to the exit plane, wherein light reflected on the display portion passes through the exit plane and the reflection-exit plane, wherein the reflection-exit plane has a first end intersecting the incidence plane and a second end intersecting the opposite end plane, wherein an inclination angle defined by the exit plane and a line that contains the first end and the second end is greater than 0.20° and less than 0.75°, and wherein the reflection-exit plane includes a light admission portion that reflects light entering through or reflected on the incidence plane to the exit plane.