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Optical waveguide sheet, edge-lit backlight unit and laptop computer

A technology for a portable computer and a backlight unit, applied in the field of light guide sheets, can solve the problems of damage to the light guide sheet 211, uneven brightness, uneven brightness of the liquid crystal display surface, etc., and achieves the effect of suppressing uneven brightness and realizing thinning

Inactive Publication Date: 2014-04-09
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inventors found that if using Image 6 The portable computer with the edge-lit backlight unit 210 shown in the figure has the disadvantage of uneven brightness on the liquid crystal display surface (uneven brightness)
The inventors of the present invention have intensively studied the causes of the above-mentioned disadvantages, and as a result, it has been found that the back surface of the light guide sheet 211 of the side-light type backlight unit 210 rubs against the top plate 216, the back surface of the light guide sheet 211 is damaged, and the incident Light to the damage is diffused, resulting in uneven brightness

Method used

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  • Optical waveguide sheet, edge-lit backlight unit and laptop computer
  • Optical waveguide sheet, edge-lit backlight unit and laptop computer
  • Optical waveguide sheet, edge-lit backlight unit and laptop computer

Examples

Experimental program
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Effect test

no. 1 approach

[0066] Laptop 1

[0067] figure 1 The portable computer 1 has an operation part 2 and a liquid crystal display part 3, and the liquid crystal display part 3 is connected to the operation part 2 in a rotatable (openable and closable) manner. The portable computer 1 is a so-called ultrabook (registered trademark) (hereinafter sometimes referred to as “ultra-slim computer 1 ”) whose case thickness (the thickest part (when the liquid crystal display unit 3 is closed)) is 21 mm or less.

[0068] The liquid crystal display unit 3 of the ultra-thin computer 1 has a liquid crystal panel 4 and an edge-lit backlight unit 11 (hereinafter sometimes referred to as “backlight unit 11”). The edge-lit backlight unit 11 faces the liquid crystal panel from the back side 4. Light is irradiated. The back, side, and surface periphery of the liquid crystal panel 4 are held by a case 6 for a liquid crystal display portion of the casing. Here, the case 6 for the liquid crystal display unit has a ...

no. 2 approach

[0115] Light guide sheet 21

[0116] Figure 4 Instead of the light guide sheet 12 of the first embodiment, the light guide sheet 21 is used in an edge-light type backlight unit of a liquid crystal display portion of a portable computer whose case thickness is 21 mm or less. The light guide sheet 21 has a three-layer structure of a light guide layer 22 , a low refractive index layer 23 laminated on the back of the light guide layer 22 , and a hard coat layer 14 laminated on the back of the low refractive index layer 23 . Regarding the hard coat 14, due to the image 3 The hard coat layer 14 is the same, so the same reference numerals are used, and the description thereof is omitted. The light guide sheet 21 is generally square in plan view, and is formed in a plate shape (not wedge-shaped) with a generally uniform thickness. The average thickness of the light guide sheet 21 is 600 μm or less. The upper limit of the average thickness of the light guide sheet 21 is more pref...

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Abstract

The optical waveguide sheet of the present invention is for use in an edge-lit backlight unit of a liquid crystal display unit of laptop computers having a housing thickness of no greater than 21 mm, and includes: an optical waveguide layer containing a polycarbonate-based resin as a principal component; and a hard coat layer laminated on the back face side of the optical waveguide layer, an average thickness of the optical waveguide sheet being no greater than 600 [mu]m. An average thickness of the hard coat layer is preferably from 2 [mu]m to 20 [mu]m. The optical waveguide sheet preferably further includes a lower refractive index layer that is laminated on the back face of the optical waveguide layer and has a refractive index lower than that of the optical waveguide layer, and the hard coat layer is preferably laminated on the back face of the lower refractive index layer.

Description

technical field [0001] The present invention relates to a light guide sheet, an edge-light type backlight unit, and a laptop computer. Background technique [0002] In liquid crystal display devices, a backlight system in which the liquid crystal layer is irradiated from the back to emit light is popularized, and backlight units such as side-light type and direct-type type are installed on the lower surface side of the liquid crystal layer. like Figure 5 As shown, the side-lit backlight unit 110 generally includes a top plate 116 located at the backmost side of the liquid crystal display part, a reflective sheet 115 disposed on the surface of the top plate 116, and a light guide sheet 111 disposed on the surface of the reflective sheet 115. , and a light source 117 that irradiates light to the end surface of the light guide sheet 111 (see Japanese Patent Laid-Open Publication No. 2010-177130). in the Figure 5 In the edge type backlight unit 110 of the present invention, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00F21V8/00G02F1/13357
CPCG02B6/0043G02B6/0065G02B6/0055G02F1/1336G02F1/133611
Inventor 中嶋宏纪古田旭
Owner KEIWA INCORPORATED