Light guide plate display device

Patent metadata

Field	Value
Publication number	US-9903996-B2
Application number	US-201515328009-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Sep 3, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A light guide plate display device includes a light guide plate, a plurality of light source devices, and a plurality of prisms. The light guide plate includes a display face and a plurality of end faces, and is formed of a light transmitting material. The light source devices are provided along respective end faces of the light guide plate, and radiate light from the end face toward an inside of the light guide plate. The prisms are formed inside the light guide plate. The prisms respectively have a plurality of side faces which face the respective light source devices. The respective side faces are inclined at least in two stages of a transmitting inclined face which transmits light radiated from the light source device, and a reflecting inclined face which reflects the light radiated from the light source device, and outputs the light to the display face, in a thickness direction of the light guide plate.

First claim

The invention claimed is:

1. A light guide plate display device comprising:
a light guide plate which includes a display face and a plurality of end faces, and is formed of a light transmitting material;
a plurality of light source devices which are provided along the plurality of end faces of the light guide plate, respectively, and radiate light from the respective plurality of end faces of the light guide plate toward an inside of the light guide plate; and
a plurality of prisms which are formed inside the light guide plate,
wherein the respective plurality of prisms have a plurality of side faces which face the respective plurality of light source devices,
wherein the respective plurality of side faces are inclined in at least two stages of a transmitting inclined face which transmits light radiated from the respective plurality of light source devices, and a reflecting inclined face which reflects the light radiated from the respective plurality of light source devices, and outputs the light to the display face, in a thickness direction which is perpendicular to the display face of the light guide plate,
wherein the plurality of light source devices respectively include
a plurality of light sources which are arranged along one of the plurality of end faces of the light guide plate, and include an effective output face which faces the one of the plurality of end faces of the light guide plate,
a light source board which includes a light source mounting face on which the plurality of light sources are mounted,
a light input lens which is disposed between the plurality of light sources and the one of the plurality of end faces of the light guide plate, and
a reflecting plate which surrounds the plurality of light sources, the light source board, and the light input lens except for a portion between the light source board and the one of the plurality of end faces of the light guide plate,
wherein the light input lens includes a first lens face which faces the plurality of light sources, and makes light radiated from the respective plurality of light sources parallel, and a second lens face which faces the one of the plurality of end faces of the light guide plate, and diffuses the light which is paralleled on the first lens face,
wherein the reflecting plate includes a neck portion in which an interval of the light guide plate in the thickness direction becomes extremely small, between the effective output face and the light source mounting face, and the reflecting plate is open so as to expand from the neck portion toward the one of the plurality of end faces of the light guide plate, and
wherein an interval of the reflecting plate in the neck portion is larger than a width of the effective output face, in the thickness direction of the light guide plate.

2. The light guide plate display device of claim 1 ,
wherein the reflecting plate is a mirror-finished reflecting plate.

3. The light guide plate display device of claim 1 ,
wherein the light source mounting face of the light source board is a black color.

4. The light guide plate display device of claim 1 ,
wherein the respective plurality of end faces of the light guide plate are formed in a protruded V shape toward the respective plurality of light source devices.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Fukui Atsushi
• Matsumura Keizou
• Yamaguchi Takayuki

Classifications

• G09F13/16

  Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape · CPC title

• G02B6/0088

  of the light guide or other optical sheets in the package · CPC title

• G02B6/006

  to produce indicia, symbols, texts or the like · CPC title

• G02B6/0083

  Details of electrical connections of light sources to drivers, circuit boards, or the like · CPC title

• G02B6/003

  Lens or lenticular sheet or layer · CPC title