Light guide plate, light source device and display apparatus
AssigneeSakai Display Products Corporation
InventorTakashi Uchida
Life of this patent
Estimating the term…
Abstract
Provided are a light guide plate which has a notch part formed at one edge part thereof and emits light made incident on the other edge part side from a light source through one surface thereof, such that it is possible to prevent the incident light from being irregularly reflected on the side face forming the notch part, and prevent an occurrence of stray light around the notch part, a light source device and a display apparatus. A side face forming the notch part has, on a light source side, an inclined face which is obliquely formed with respect to the incident light or a parallel face which is formed parallel to the incident light.
Claims10
A light guide plate which includes a major surface, a first side face, a second side face adjacent to the first side face, a third side face facing to the first side face, a fourth side face facing to the second side face, and a first notch part formed on the first side face, emits light entering from the second side face through the major surface, and has a rectangular shape in a plan view and a predetermined thickness, wherein:
- a face of the first notch part proximal to the second side face is an inclined side face which is formed obliquely with respect to the first side face,
- the inclined side face is configured such that an incident angle formed when the light entering from the second side face is directly made incident on the inclined side face is larger than a critical angle at which incident light is totally reflected by the inclined side face, and
- the light entering from the second side face and being totally reflected by the inclined side face progresses toward the third side face or the fourth side face.
Dependencies are inferred from the claim text.