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Surface light source element and image display device having the surface light source element

A surface light source and component technology, applied in the field of surface light source components, can solve the problems of not being able to achieve brightness and performance, and achieve the effects of improving brightness, easy distribution of surface brightness, and easy uniformity

Inactive Publication Date: 2011-11-30
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In recent years, although there are strong demands on the market for image display devices for TVs to be larger, lighter, thinner, and lower in power consumption, the necessary brightness cannot be achieved on the basis of meeting these requirements.
Therefore, although it is conceivable to incorporate a prism sheet, which is a commercially available brightness enhancement film, into the light guide plate as described in Patent Document 3, sufficient performance cannot be obtained even in this way.

Method used

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  • Surface light source element and image display device having the surface light source element
  • Surface light source element and image display device having the surface light source element
  • Surface light source element and image display device having the surface light source element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] A mirror surface stamper made of stainless steel was used for the stamper on the injection surface side (hereinafter referred to as stamper 1 ). On the other hand, a stamper on the bottom side (hereinafter referred to as stamper 2) in which prism patterns with a height of 0.007 mm and an apex angle of 130 degrees are arranged at predetermined intervals was produced by directly V-shaped grooves with an apex angle of 130 degrees and a height of 0.007 mm were produced by cutting the mold nest, and electroforming was performed directly from the cutting nest to form a nickel electroformed layer, and the master was peeled off.

[0163] These stampers 1 and 2 are used as a transfer module, assembled in the mold fixed side cavity and the mold movable side cavity of the injection molding machine, and a guide with a fine structure for a 40-inch LCD TV is obtained by injection molding. Light board. The outer dimensions of the obtained light guide plate are: length×width×height ar...

Embodiment 2

[0169] A negative photoresist (CA3000) manufactured by Tokyo Ohka Kogyo Co., Ltd. was applied to clean glass, heated on a hot plate at 110° C. for 2 minutes, and then cooled to room temperature. This glass substrate was brought into close contact with a photomask provided with slits at predetermined intervals, and rotated at a constant speed from -35° to +35°, during which 1400 mJ of UV light was irradiated. After stripping the photomask, the substrate was developed. A conductive nickel film was formed on the surface of the obtained master by a conventional method, and nickel was electroformed as a metal for electroforming on the conductive nickel film to form a nickel electroformed layer. Furthermore, the master was peeled off from the nickel conductive film, and a stamper on the injection surface side with a height of 0.01 mm and a flat portion with a width of about 0.01 mm on the top portion and a trapezoidal pattern with an inclination angle of 55 degrees was produced. (h...

Embodiment 3

[0174] A stamper on the bottom side (hereinafter referred to as stamper 5) in which prism patterns with a height of 0.007 mm and a vertex angle of 120 degrees are arranged at predetermined intervals is produced by directly inserting a diamond turning tool into the mold. V-shaped grooves with a vertex angle of 120 degrees and a height of 0.007 mm were produced by cutting, and electroforming was directly performed from the cutting nest to form a nickel electroforming layer, and the master was peeled off.

[0175] The stamper 3 and the stamper 5 used in Example 2 were used as a transfer module, assembled into the mold fixed side cavity and the mold movable side cavity of the injection molding machine, and obtained a 40-inch LCD TV by injection molding. Light guide plate with fine structure. The outer dimensions of the obtained light guide plate are: length×width×height are 900×511×4 mm. In this light guide plate, the exit surface is a mirror surface, the height of the V-shaped c...

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Abstract

An object of the present invention is to improve the luminance in the front direction in a surface light source element including a light guide plate having a primary light source on at least one end surface, a reflection unit, and a prism sheet. A surface light source element using a light guide plate (1) with concave strips (9) on the bottom surface (7) side is characterized in that after passing through the prism sheet of the optical sheet on the light guide plate (1), in order to emit light in the front direction , the average slope R of the bottom surface of the light guide plate relative to the slope of the concave strip (9) is set within the range of the angle shown in the following formula, R≤{π / 2-sin-1(0.422 / nLGP)} / 2R≥sin-1(1 / nLGP)-sin-1(0.643 / nLGP) R: Average slope (radian) relative to the bottom surface of the light guide plate (1) nLGP: Refraction of the base material of the above-mentioned light guide plate (1) Rate.

Description

technical field [0001] The present invention relates to a side-light type surface light source element having a plurality of primary light sources, and an image display device using the surface light source element, and particularly relates to a side light used in liquid crystal display devices and illuminated billboard devices requiring high image quality. A type surface light source element, and an image display device using the surface light source element. Background technique [0002] There are two types of surface light source elements used in image display devices: a direct type and an edge type. [0003] The direct-type surface light source element is a surface light source element in which a plurality of primary light sources are arranged on the back surface of a plate-shaped member forming a light emitting surface. Since the direct type has a feature that the light source is arranged on the backside of the light emitting surface, it is easy to increase in size, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00G02B6/00G02F1/13357F21Y101/02
CPCG02B6/0053G02B6/0036G02B6/0038
Inventor 木下诚二
Owner KURARAY CO LTD
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