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Ultrathin liquid crystal backlight guide light film, ultrathin liquid crystal backlight unit and portable computer

A technology of backlight unit and light guide film, which is applied in the field of portable computers, can solve the problems of reduced brightness uniformity, reduced brightness and uniformity of brightness, and reduced brightness of light and uniformity of brightness, etc., to achieve thinning, suppress brightness and brightness Reduced uniformity, less prone to uneven brightness

Active Publication Date: 2014-08-27
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned ultra-thin light guide film is prone to deformation due to changes over time.
Due to the curved surface of the above-mentioned light-guiding film after deformation, the brightness and uniformity of brightness of the light emitted from the above-mentioned light-guiding film may be reduced
In addition, the deformation of the above-mentioned light-guiding film causes the retardation of the above-mentioned light-guiding film to increase, and the optical characteristics of the light emitted from the light-guiding film change due to the retardation, and the brightness and brightness uniformity may decrease.
As a result, the brightness uniformity of the light emitted by the light guide film is reduced, which may cause uneven brightness of the display screen of the ultra-thin portable computer

Method used

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  • Ultrathin liquid crystal backlight guide light film, ultrathin liquid crystal backlight unit and portable computer
  • Ultrathin liquid crystal backlight guide light film, ultrathin liquid crystal backlight unit and portable computer
  • Ultrathin liquid crystal backlight guide light film, ultrathin liquid crystal backlight unit and portable computer

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0058] laptop

[0059] figure 1 The portable computer 1 is a notebook computer, and 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 above-mentioned portable computer 1 is a so-called "ultrabook (registered trademark)" in which the casing (the casing that houses all the components of the portable computer 1) (the thickest part (when the liquid crystal display unit 3 is closed)) is 21 mm or less (Hereinafter, it may also be referred to as "Slim PC 1").

[0060] The liquid crystal display part 3 of the ultra-thin computer 1 has a liquid crystal panel 4 and an edge-light ultra-thin liquid crystal backlight unit 11 (hereinafter, sometimes referred to as "backlight unit 11"), and the edge-light ultra-thin liquid crystal The backlight unit 11 irradiates light to the liquid crystal panel 4 from the back side. The surroundings of the front, side...

no. 2 approach

[0104] backlight unit

[0105] Figure 4 The backlight unit 31 includes: a light guide film 32 ; a reflection plate 13 stacked on the back of the light guide film 32 ; and a light source 15 that irradiates light to the light guide film 32 . The light source 15 is provided on the end face side substantially perpendicular to the ridge line direction in the finely modulated structure of the light guide film 32 described below.

[0106] Light guide film

[0107] The light guide film 32 is used as a light guide film of an edge-lit ultra-thin liquid crystal backlight unit that exists in a liquid crystal display portion of a notebook computer whose case thickness is 21 mm or less.

[0108] In the light guide film 32 , light enters from the end surface and exits substantially uniformly from the surface side. The light guide film 32 has a sheet main body 36 .

[0109] The surface of the sheet main body 36 has a wavy fine modulation structure. In addition, in the wavy finely modula...

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Abstract

The subject of the invention provides an ultrathin liquid crystal backlight light guide film which can restrain reduction of lightness and lightness uniformity at the same time of realizing thinness. In addition, the subject of the invention provides an ultrathin liquid crystal backlight unit and a portable computer which are not easy to generate nonuniformity of lightness by restraining reduction of lightness and lightness uniformity of the light emitted from the light guide film, and can realize thinness. The light guide film is an ultrathin liquid crystal backlight light guide film which roughly uniformly emits light emitted through end surfaces from surfaces, the thickness being below 600 [mu] m. The characteristics are that delay value (Re) is less than 50 nm and average residual stress is less than 8*105 Pa.

Description

technical field [0001] The invention relates to a light guide film for an ultra-thin liquid crystal backlight source, an ultra-thin liquid crystal backlight unit and a portable computer. Background technique [0002] A backlight system in which the liquid crystal layer is irradiated from the back side to emit light has become popular in liquid crystal display devices, and backlight units such as edge-light type and direct-light type are mounted on the lower surface side of the liquid crystal layer. Generally speaking, if Figure 5 As shown, the side-light backlight unit 111 is mounted on the inner surface side of the top plate 114, and the top plate is the outermost shell of the liquid crystal display part. The side-light backlight unit 111 has: The reflection plate 113 , the light guide plate 112 provided on the surface of the reflection plate 113 , and the light source 115 for irradiating light to the end surface of the light guide plate 112 (see Japanese Patent Laid-Open ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00G02F1/13357
CPCG02F1/1336G02F1/133611
Inventor 冈部元彦
Owner KEIWA INCORPORATED
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