Patent ID: 6700632
Filing Date: 2004-03-02
Classification: G02B,Y10S

Abstract:
A front-lighting illuminator, comprising:a front light guide plate; and a light source disposed on one of side surfaces of said front light guide plate; wherein said front light guide plate includes an incidence surface on which light from said light source is incident, and two light transmission surfaces, said incident light being made to exit from one of said two transmission surfaces thereof and to enter a liquid-crystal cell through a front surface thereof which is disposed behind said front light guide plate; and wherein a plurality of dots each constituted by a small recess or protrusion portion for reflecting said light from said incidence surface toward said one light transmission surface are formed in or on another surface of said two light transmission surfaces of said front light guide plate opposite to said one light transmission surface, each of said dots being substantially rectangular in plan view and being substantially V-shape in section with a vertex angle of about 70.6Â°Â±2.5Â°, and an inclination angle of said section being in a range of from 35Â°to 43Â°so as to enable an increase of light quantity exiting from said front light guide plate and entering said liquid crystal cell.