Illuminator and display device used thereby

Abstract

The illumination device comprises a light guide plate 2 and point light sources 1 arranged at the incident face side of the light guide plate, and fine scattering structures 20 separated from each other are formed on almost whole surfaces of a light-emitting surface and the surface at an opposite side. The fine scattering structure 20 has a directivity of a longitudinal direction in its shape, and the longitudinal direction is almost parallel with the direction connecting the fine scattering structure and the point light source. Further, the surface at the opposite side of the light-emitting surface of the light guide plate is divided into a plurality of areas 9, 10, 11, and a thickness of the light guide plate at each area becomes thinner as it becomes distant from the light source.

Description

technical field [0001] The present invention relates to a lighting device used in computer equipment, a mobile phone, or general electronic equipment, and a display device using the lighting device. Background technique [0002] In recent years, color liquid crystal display devices used in computer equipment, mobile phones, etc. have been increasingly required to be thinner, lighter in weight, higher in brightness, and lower in power consumption. Along with this, as a light source of an illuminating device used in a color liquid crystal display device, high-brightness LEDs with high luminous efficiency are often used. In addition, the design of the light guide plate that confines the light from the light source and irradiates it on the liquid crystal display element has also actively realized the design that pays attention to point light sources such as LEDs. In detail, it is disclosed that: on the back of the light guide plate, arranging diffuse pattern elements with direc...

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Problems solved by technology

[0003] In this way, in the conventional lighting device, since the longitudinal direction of the shape is almost perpendicular to the direction connecting the diffusion pattern element and the light source, there is a problem that the arc direction with respect to the diffusion pattern element cannot be sufficiently obtained. Arrangement density of diffuse graphic elements, difficult to arrange graphic

Or, when about 1 / 2 of the light guide plate has a slope, it is difficult to design a diffuse graphic element because the reflection angle of light that is multiple-reflected internally in the sloped portion changes synchronously with the propagation

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