Light guide plate and surface illumination device

A technology of a light guide plate and a light incident surface, which is applied in the directions of electric light sources, lighting devices, optical waveguides and light guides, can solve the problems of producing color spots and insufficient suppression of color spots, and achieves the goal of suppressing and reducing color spots. Effect
CN103969733AActive Publication Date: 2014-08-06株式会社东北电子
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
株式会社东北电子
Publication Date
2014-08-06

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Abstract

A light guide plate includes a light introduction unit that confines light incident from a point light source through the light incident surface and a light guide plate body thinner than the maximum thickness of the light introduction unit. The light introduction unit includes an inclined surface inclined toward an end of a surface of the light guide plate body from a surface in a portion having the thickness greater than that of the light guide plate body. The light guide plate body includes a directivity conversion pattern located between the light introduction unit and an effective illumination region of the light guide plate body on at least one of a surface at a light emergent side and an opposite surface thereof. The directivity conversion pattern converts a directivity direction of the light passing through an effective illumination region from the light introduction unit such that an angle formed by the light and a direction perpendicular to the light incident surface increases when viewed from a direction perpendicular to a light exit surface.
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Description

technical field

[0001] The invention relates to a light guide plate and a surface light source device. Specifically, it relates to a surface light source device used as a backlight of a liquid crystal display device or the like, and a light guide plate used for the surface light source device. Background technique

[0002] In recent years, along with the reduction in thickness of mobile devices incorporating surface light source devices, reduction in thickness of surface light source devices has also been demanded. In order to reduce the thickness of the surface light source device, it is necessary to reduce the thickness of the light guide plate. However, even if the thickness of the flat light guide plate can be reduced, there is a limit to reducing the height of the light source composed of LED (light-emitting diode: light-emitting diode). Therefore, in the case of using a flat light guide plate, since the height of the light source is greater than the thickness of the ...

Claims

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