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Light control film and backlight device using it

A light control and thin film technology, applied in lighting devices, optics, light guides, etc., can solve problems such as scars, interference patterns, and inability to expand the viewing angle

Inactive Publication Date: 2008-12-24
KIMOTO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Generally speaking, although the diffuser can increase the ratio of light emitted to the front (orthogonal surface to the film) through the surface design based on geometric optics, it is prone to interference patterns due to the regularly arranged convex parts. In this way, flashes are produced, which has the disadvantage of being difficult to see
In addition, the result of excessive concentration of light on the front will not be able to expand the viewing angle
[0006] In addition, when the diffusion film is used alone, although the above-mentioned problems do not occur, the front brightness is not enough
[0007] Although the technique described in Patent Document 1 uses both a diffuser and a light-diffusing film, the disadvantage is that the use of a diffuser will reduce the frontal brightness improved by the diffuser
In addition, due to lamination of films, Newton's rings are formed between each member, and scratches due to contact between members may also occur in some cases.

Method used

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  • Light control film and backlight device using it
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  • Light control film and backlight device using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0129] Four types (1)-(4) forming specific concavo-convex are produced by laser precision machining technology. Among them, ultraviolet curable resin with a refractive index of 1.50 was injected into the molds of (1) to (3), and silicone resin with a refractive index of 1.40 was injected into the mold of (4). Then, after curing the injected resin, take it out from the mold to obtain light control films (1)-(4) of 23cm (light source and vertical direction)×31cm (light source and parallel direction) (the light source of Examples 1-4). control film).

[0130] Next, with a laser microscope (VK-9500: Keyence Corporation), using a 50x objective lens, the height data of the concave-convex surfaces (light exit surfaces) of the light control films (1) to (4) were measured. The measurement interval in the plane is about 0.26 μm. Because the field of view of the 50x objective lens is 270μm×202μm, the surface height data of the area of ​​1mm×1mm can be measured by using the automatic co...

Embodiment 5～8

[0139] Four types (5)-(8) forming specific concavo-convex are produced by laser precision machining technology. Among them, UV-curable resin with a refractive index of 1.50 is injected into the molds of (5) to (7), and silicone resin with a refractive index of 1.40 is injected into one mold (8). Next, after curing the injected resin, it was taken out from the mold to obtain light control films (5) to (8) (light control films of Examples 5 to 8) of 23 cm×31 cm.

[0140] Next, the surface height data of the concavo-convex surfaces (light-emitting surfaces) of the light control films (5)-(8) were measured in the same manner as in Examples 1-4. The measurement will be carried out at any five places on each light control film, and using this surface height data, calculate the average (θ nv ). Then, from the same surface height data, the surface area (A2) of the uneven surface was obtained, and the ratio (A1) to the measured area (A1) of the orthographic projection of the uneven s...

Embodiment 9～12

[0159] Four types (9)-(12) forming specific concavo-convex are produced by laser precision machining technology. Among them, UV-curable resin with a refractive index of 1.50 is injected into the molds of (9) to (11), and silicone resin with a refractive index of 1.40 is injected into the mold (12). Next, after curing the injected resin, it was taken out from the mold to obtain light control films (9) to (12) (light control films of Examples 9 to 12) of 23 cm to 31 cm.

[0160] Next, with a laser microscope (VK-9500: Keyence Corporation), using a 50x objective lens, the height data of the concave-convex surfaces (light exit surfaces) of the light control films (9) to (12) were measured. The measurement interval in the plane is about 0.26 μm. Because the field of view of the 50x objective lens is 270μm×202μm, the surface height data of the area of ​​1mm×1mm can be measured by using the automatic connection function. The measurement was carried out at any five places on each li...

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Abstract

The present invention provides a light control film capable of improving frontal brightness, having appropriate light diffusing properties, and having no problems of interference patterns and flare. It has a light control film (10) with a concave-convex surface, which is configured so that, in a substantially square region with an area of ​​1 mm2 or more set at any point on the concave-convex surface, the longitudinal direction of the substantially square region is adopted. In terms of the curved surface on the uneven surface obtained by approximating the height data of the uneven surface measured at specific intervals in the lateral direction, the inclination of the curved surface on the uneven surface to the reference plane of the film The average (θnv) of is greater than or equal to 27 degrees and less than or equal to 70 degrees at substantially all locations of the light control film.

Description

technical field [0001] The present invention relates to a light control film used for a backlight device such as a liquid crystal display, and a backlight device using the light control film. Background technique [0002] Conventionally, side-type or direct-type backlight devices (BackLight) have been mostly used in liquid crystal displays and the like. The side-type backlight device is mostly used in notebook computers because the thickness of the backlight device itself can be reduced; while the direct-type backlight device is mostly used in large-scale LCD TVs. [0003] In these conventional backlight devices, there is a component of light obliquely emitted from the front. Especially in side-type backlight devices, there are many light components obliquely emitted from the front, so it is difficult to obtain high front brightness. [0004] In a conventional backlight device, in order to increase the front brightness, several optical films such as a diffuser and a light ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/02F21V8/00G02F1/1335F21Y103/00
Inventor 饵取英树
Owner KIMOTO CO LTD