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Area light source device and transmission type image display device

An image display device and image display technology, which are applied to lighting devices, lighting device components, optics and other directions, and can solve problems such as uneven brightness

Inactive Publication Date: 2006-11-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional surface light source device, if the distance between the light sources is set longer, or the distance between the light source and the light diffusion plate is set shorter, it is difficult for the light diffuser to diffuse the light from a plurality of light sources. Sufficient diffusion, therefore, there is a problem that brightness unevenness is likely to occur

Method used

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  • Area light source device and transmission type image display device
  • Area light source device and transmission type image display device
  • Area light source device and transmission type image display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0032] figure 2 In the first embodiment shown in , the surface light source device has: a plurality of light sources 2, which are arranged separately from each other; a light diffusion plate 3, which is arranged on the upper side (front side) of these plurality of light sources 2; 4. It consists of a plurality of prisms integrally formed on the surface of the light diffusion plate 3 on the light source 2 side. The cross-sectional shape of the prism is an isosceles triangle shape, and the base of the isosceles triangle is connected to the surface of the light-diffusing plate 3 on the light source side.

[0033] When the interval a between adjacent prisms is 0 (a=0), it is preferable to configure it so that the following formula (1) is satisfied.

[0034] 【Number 1】

[0035] i) when a=0

[0036] the tan -1 (L / 4d)=(π / 2-α / 2)-sin -1 {n×sin(3α / 2-π / 2)} …Formula (1)

[0037] L: Interval of light sources

[0038] d: the distance between the light source and the light diffuser ...

no. 2 Embodiment approach

[0052] image 3 In the second embodiment shown in , the surface light source device has: a plurality of light sources 2, which are arranged separately from each other; a light diffusion plate 3, which is arranged on the upper side (front side) of these plurality of light sources 2; 4. It consists of a plurality of prisms integrally formed on the surface of the light diffusion plate 3 on the light source 2 side. The cross-sectional shape of the prism is a trapezoid, and the lower base (the longer base) of the trapezoid is connected to the surface of the light-diffusing plate 3 on the light source side.

[0053] In the second embodiment, it is preferable to satisfy the following formula (3) and The way of formula (4) constitutes.

[0054] 【Number 3】

[0055] a≥0

[0056] the tan -1 (L / 3d) = sin -1 (n×sinθ) …Formula (3)

[0057] L: Interval of light sources

[0058] d: the distance between the light source and the light diffuser

[0059] θ: Angle formed by the inclined s...

no. 3 Embodiment approach

[0070] Figure 4 In the third embodiment shown in , the surface light source device has: a plurality of light sources 2, which are arranged separately from each other; a light diffusion plate 3, which is arranged on the upper side (front side) of these plurality of light sources 2; 4. It consists of a plurality of prisms integrally formed on the surface of the light diffusion plate 3 on the light source 2 side. The cross-sectional shape of the prism is an isosceles triangle shape, and the base of the isosceles triangle is connected to the surface of the light-diffusing plate 3 on the light source side. Adjacent prisms in the shape of isosceles triangles are configured such that their apex angles α differ from each other. That is, the apex angle α, to correspond to the horizontal distance L from the light source 2 1 And satisfy the following formula (5) mode change. In this configuration, the height (thickness) h of all the prisms is set to be the same. In addition, the lig...

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Abstract

A surface light source device and a transmissive type image display device are provided to allow the emission of light having uniform brightness even while the surface light source device has the reduced number of light sources and the reduced thickness. A plurality of light sources(2) are apart from one another within a lamp box(5). A light diffusing plate(3) is disposed at the front of the light sources. The distance between neighboring light sources is set to 10 millimeters or more. The distance between the light diffusing plate and the light source is set to 50 millimeters or less. A deflection structure(4) is installed at the light source-side of the light diffusing plate or within the diffusing plate. The deflection structure emits the incidence light, which is incident on the light diffusing plate from the light sources, in a substantially perpendicular direction with respect to a surface of the light diffusing plate.

Description

technical field [0001] The present invention relates to a surface light source device having a plurality of light sources arranged separately from each other and a light diffusion plate on the front side of the light sources, and a transmissive image display device without uneven brightness using the surface light source device. Background technique [0002] As a transmissive image display device, for example, a surface light source device is arranged as a backlight on the lower surface side (rear side) of a transmissive image display unit in which a pair of polarizing plates are arranged on both upper and lower surfaces of a transmissive liquid crystal element. structure. As such a surface light source device, a surface light source device is known in which a plurality of light sources are arranged in a light box and a light diffusion plate is arranged on the front side of these light sources (see Patent Document 1). As such a surface light source device, a structure capab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V5/02G02B5/02
CPCG02F1/133604G02F1/133606G02F1/133611G02F1/13362
Inventor 金光昭佳
Owner SUMITOMO CHEM CO LTD