Patent ID: 8848136
Filing Date: 2014-09-30
Classification: G02B,G02F

Abstract:
1. A display device which outputs light emitted from a light source to an observer side in a form of an image, the display device comprising: a light guide plate having a light transmitting property, which has a light output face directed toward the observer side, a back face opposing to the light output face, and a side face positioned between the light output face and the back face; a light source disposed on the side face of the light guide plate so as to be capable of emitting light thereto; an optical sheet disposed on the observer side of the light guide plate; a liquid crystal panel disposed on the observer side of the optical sheet; and a device for enlarging a view disposed on the observer side of the liquid crystal panel, wherein a plurality of protruding unit optical elements are arranged in a row on the light output face side of the light guide plate, along the sheet face; the unit optical elements extend from the side face where the light source is disposed to the side face opposing thereto with a predetermined cross section, and are arranged in a row in a direction orthogonal to the extending direction thereof; a plurality of protruding unit prisms are arranged in a row on the light guide plate side face of the optical sheet, along the sheet face; the unit prisms extend in the arrangement direction of the unit optical elements, with a predetermined cross section, and are arranged in a row in a direction orthogonal to the extending direction of the unit prism; the device for enlarging a view is a view enlarging member which is disposed on the observer side of the liquid crystal panel; and the view enlarging member comprises a light enlarging portion provided with: a plurality of transmissive portions having a substantially trapezoidal cross section with a shorter upper base on the observer side and a longer lower base on the liquid crystal panel side, having a light transmitting property, and arranged in a row along the sheet face; and in-between portions formed between the adjacent light transmissive portions and having a refractive index smaller than that of the transmissive portion, the light enlarging portion totally reflecting light between an interface of the transmissive portions and the in-between portions, and the transmissive portions extend in one direction while maintaining the substantially trapezoidal cross section.