Patent ID: 7686496
Filing Date: 2010-03-30
Classification: G02B

Abstract:
1. A light guide plate comprising: an incidence end face provided by a first minor face; a distal end face provided by a second minor face opposite to said incidence end face; an emission face provided by a first major face; a back face provided by a second major face opposite to said emission face, light incident to said incidence end face being emitted from said emission face on the way of propagating within said light guide plate, wherein a plurality of prismatic projection rows are formed on said emission face or said back face as to run across a light supply direction toward said distal end face from said incidence end face; each of said plurality of projection rows is formed of a first slope and a second slope which meet each other to provide a ridge line; said second slope is located nearer than said first slope to said incidence end face; said emission face or said back face on which said plurality of projection rows are formed is provided with a first region and a second region that is remote than said first region from said incidence end face; and, said first slope gives inclination angle θa with respect to an imaginary plane bridging valley lines of mutually adjacent projections of all said projections so that the following conditions 1 to 3 are satisfied,