Dai Nippon Printing Co., Ltd.

Masahiro Gotou

Hiroshi Yamamoto

Hiroshi Sekiguchi

The present invention provides a display device which can ensure a large viewing angle while maintaining high light source energy use efficiency. The display device, which outputs light emitted from a light sourceto an observer side in a form of an image, comprises: a light guide platewhich has a light output face, a back face, and a side face positioned between the light output face and the back face; a light sourcewhich emits light to the side face of the light guide plate; an optical sheetdisposed on the observer side of the light guide plate; a liquid crystal paneldisposed on the observer side of the optical sheet; and a devicefor enlarging a view disposed on the observer side of the liquid crystal panel.

Display device having enlarged viewing angle

A light guide plate shaped substantially like a plate includes a light incident surface, a light exit surface and a reflective surface, which is opposite to the light exit surface, configured to reflect light toward the light exit surface. A plurality of optical units is arranged along the reflective surface in a direction orthogonal to the light incident surface. Each optical unit is shaped substantially like a quadratic prism that is convex toward the reflective surface and has a top surface and two slopes being formed opposite to each other with respect to the top surface. A dimension of the top surface is constant in a direction of arrangement of the optical units and an interval between adjacent optical units becomes greater as the adjacent optical units lie further away from the light incident surface in the direction of arrangement of the optical units.

Growing community of inventors

Tokyo, Japan

Masahiro Gotou