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Light-redirecting article

A light redirection and product technology, which is applied in the direction of light guide, optics, optical components, etc., can solve the problem of difficult to obtain the overall manufacturing of small hemispherical lenses

Inactive Publication Date: 2010-02-24
SKC HAAS DISPLAY FILMS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain the monolithic fabrication of hemispherical lenslets using conventional methods

Method used

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Examples

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Embodiment 1

[0112] The following example shows that in one embodiment Figure 4A and 4B How each step is implemented given in:

[0113] 1. Substrate treatment. A thermal sensitive adhesive (TSA) material (Estane 5703; softening point 85° C.) was coated on a polyethylene terephthalate (PET) substrate to give a dry thickness of 7 μm. This was done by preparing an 8.3 wt% solution of Estane 5703 containing 1 wt% of fluorocarbon surfactant FC431 (based on the weight of Estane) from 3M Company in tetrahydrofuran (THF) and dissolving it at 101.6 cm 3 / m 2 The wet coverage is achieved by coating it on a 0.1mm thick polyethylene terephthalate (PET) sheet.

[0114] 2. Microsphere deposition and DASA self-accumulation. The water suspension containing 9.8wt% polystyrene microspheres (average diameter 3.4 μm, coefficient of variation (cv) 0.3), fish skin glue and Olin 10G surfactant was separated in 21.5cm 3 / m 2 of wet coverage applied to the TSA layer. The coating was then dried at 30°C to ...

Embodiment 2

[0121] The following are examples of steps in an alternative embodiment of the invention.

[0122] 1. Substrate treatment. A 20 μm thick TSA film containing low density polyethylene (LDPE) was extrusion coated onto a 100 μm thick PET substrate.

[0123] 2. Microsphere deposition and DASA self-accumulation. An aqueous suspension of poly(methyl methacrylate) (PMMA) microspheres (30 wt %) with an average size close to 10 μm and cv 2 The dry coverage of microspheres in an aqueous suspension containing 3% by weight of a polyalkylene oxide modified polydimethylsiloxane surfactant from Dow Corning. Examination of the coating by light microscopy revealed a mosaic monolayer containing 2D HCP domains.

[0124] 3. Embedding. To generate the close-packed micro-hemisphere arrays, the embedding of the microsphere close-packed arrays was accomplished by simply heating the assemblage in an oven set at 125°C for 2 minutes.

[0125] 4. Molding and curing. The coating with embedded microsph...

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Abstract

A method for forming a light-redirecting article is provided wherein a surface of a substrate is conditioned by applying a layer of an embedment material. A close-packed layer of microspheres is assembled using drying-assisted self-assembly and applied to the conditioned surface. Microspheres are then embedded halfway into the surface of the layer of the embedment material.

Description

technical field [0001] The present invention relates generally to light redirecting articles, and more particularly to light redirecting films formed with arrays of hemispherical microlenses. Background technique [0002] Transmissive liquid crystal display (LCD) panels offer a dense, lightweight alternative to other types of displays, but require some sort of backlighting to provide a modulated light source. refer to figure 1 A schematic block diagram of a display device 10, backlighting for an LCD panel 12 and similar display devices is typically provided by one or more light redirecting articles 20 positioned relative to the viewer on the LCD panel 12 and redirects light from one or more light sources 14 to pass through the LCD panel 12 . [0003] The inherent limitations of LCD technology create an urgent need to achieve an efficient backlight arrangement that directs as much light as possible through the LCD panel. In conventional operation, one or more diffuser and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V5/00F21V5/04G02F1/13357G02F1/1333
CPCG02F1/133606G02B6/0065G02F2001/133607G02F2001/133507G02B6/0051G02B6/0053G02F1/133507G02F1/133607G02F1/1335
Inventor K·查理C·W·兰德尔C·C·安德森
Owner SKC HAAS DISPLAY FILMS CO LTD
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