Illuminating device, and liquid crystal display device and portable terminal device including the illuminating device
AssigneeNEC Corporation
InventorHideyuki Shirota
Life of this patent
Estimating the term…
Abstract
On the side surface of an optical guide plate (104), an engaging protrusion (105) is formed for fixing the optical guide plate (104) on to a frame (101) by fitting the optical guide plate in a recessed portion formed on the frame. The light emitted from an LED (107) enters the optical guide plate (104) from a light-incident end surface and travels in the optical guide plate (104) while spreading in a fan-shape. The engaging protrusion (105) is formed outside the outgoing-angle range of the beam (109) spreading in the fan-shape, thereby preventing occurrence of bright line caused by reflection of light at the corner portion of the base of the engaging protrusion (105).
Claims5
An illuminating device comprising:
- a light source that emits light spreading in a fan-shape;
- and
- an optical guide plate including a light-incident end surface that receives therein light emitted from said light source, a luminescence section that converts the received light into a surface-emission light for emission thereof, and a protrusion that fixes the optical guide plate onto a housing, wherein:
- said protrusion is formed on the side surface of the optical guide plate that crosses at right angles said light-incident end surface of said optical guide plate at a position outside an outgoing-angle range of the light that travels through said light-incident end surface while spreading in a fan-shape.
A liquid crystal display device comprising:
- a light source that emits light spreading in a fan-shape;
- an optical guide plate including a light-incident end surface that receives therein light emitted from said light source, a luminescence section that converts the received light into a surface-emission light for emission thereof, and a protrusion that fixes said optical guide plate onto a housing;
- and
- a liquid crystal display panel that uses light emitted from said luminescence section of said optical guide plate as a backlight source, wherein:
- said protrusion is formed on a side surface of said optical guide plate that crosses at right angles said light-incident end surface of said optical guide plate at a position outside an outgoing-angle range of the light that travels through said light-incident end surface while spreading in a fan-shape and that does not overlap an effective display area of said liquid crystal display panel.
Dependencies are inferred from the claim text.