Light control film

A technology of light control film and light transmission film, applied in the field of light control film, can solve the problems of increasing film thickness and reducing light transmittance, etc.

Active Publication Date: 2014-02-19
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this inevitably creates problems of increasing film thickness and reducing light transmittance

Method used

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Examples

Experimental program
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Effect test

example 1-5

[0223] Microreplication was performed using the UV curing process described in PCT Publication No. WO9511464 and above. Unless otherwise specified, the UV curing process used in these examples does not include Figure 5 The optional second radiation source.

[0224] Tool A, with a patterned area of ​​approximately 7 inches by 36 inches (17.8 cm by 91.4 cm), was secured to a mandrel with an approximate diameter of 37 inches (94 cm) using 3M 8402 tape. Melinex453 film is wound from the unwinding idler to the rewinding idler along the surface of tool A, such as Figure 5 shown. The surface-treated (adhesion-promoting) side of the film faces the tool. Heat the mandrel to 54°C (130°F). Run the film at a line speed of 10 cm / sec (20 ft / min) at a nip pressure of 207 kPa (30 psi) at the point of contact between the first nip roll (95 Shore D nitrile rubber roll) and the mandrel . exist Figure 5 Resin was applied to the membrane by manually pouring small, continuous beads of res...

example 6 and 7

[0236] A film of Teonex Q71 with a thickness of 6 μm was primed on one side with a 5% solids solution of Vitel 1200B in an 85% / 15% mixture of dioxolane and cyclohexanone and dried in an oven at 160°F for 2 minute. The coating thickness was 300 nanometers as measured with a white light interferometer. The film was then coated on the opposite side with a silicone-polyurea adhesive consisting of MQ resin (SR545) and silicone polyurea (SPU) elastomer at 55 : 45 ratio of 28% solids solution composition. SPU elastomers are formed by the condensation reaction of 33 kDa diamodimethicone, Dytek A, and Desmodur W in a ratio of 1:1:2, as described in US Patent No. 6,824,820. The film was then dried in an oven at 160°F for 2 minutes and laminated to a PET film by passing the material through a nip roll in contact with a Loparex 10256 fluorosilicone-treated PET release liner. The coating thickness was 4.2 microns as measured by a white light interferometer.

[0237] Example 6 was prepa...

example 8

[0239] A sample prepared according to Example 1 was coated with a layer of silica to generate Example 8 as follows. Silica deposition was performed in a batch reactive ion plasma etcher (Plasmatherm, model 3280). The microreplicated article was placed on the power electrode, and the chamber was pumped to a base pressure of 5 mTorr. First, the article was plasma treated in an argon plasma at a pressure of 25 mTorr for 20 seconds. After that, tetramethylsilane vapor was introduced at a flow rate of 150 sccm, and the plasma was maintained at a power of 1000 watts for 10 seconds, thereafter, oxygen was added to tetramethylsilane at a flow rate of 500 sccm, Hold for another 10 seconds. After this step, while the plasma was still on, the tetramethylsilane vapor flow was reduced in a stepwise fashion from 150 seem to 50 seem, 25 seem, and 10 seem, each of these steps lasting 10 seconds. After the final step with a tetramethylsilane vapor flow of 25 sccm, the flow was stopped and i...

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Abstract

The present disclosure provides a light control film that is capable of transmitting light, or allowing a viewer to observe information, only within a viewing region centered around the normal (perpendicular line) to a surface. The light control film generally blocks information or light outside of this viewing region, and provides security in all directions including right-and-left and up-and-down of the film. The light control film includes a plurality of light-transmissive cavities that are surrounded by a light absorbing material, such that each of the plurality of cavities is optically isolated from adjacent cavities. Each of the light-transmissive cavities effectively block light which enters the cavity outside of a viewing (that is, cutoff) angle.

Description

Background technique [0001] Light control films (LCFs) (also known as light-collimating films) are optical films (eg, privacy films) that are constructed to modulate the transmission of light, so that what others see is generally obscured. Various LCFs are known and generally comprise a light transmissive film having a plurality of parallel grooves formed of a light absorbing material. [0002] The LCF can be positioned against a display surface, image surface, or other surface to be viewed. In the case of normal incidence angle (that is, 0 degree viewing angle), the observer watches the image through the LCF in the direction perpendicular to the film surface, and the image is visible. As the viewing angle increases, the amount of light transmitted through the LCF decreases until a cutoff angle is reached where essentially all light is blocked by the light-absorbing material and the image is no longer visible. This creates secrecy from the observer by preventing observation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/04G02F1/1335
CPCG02B5/02G02B27/0018G02B2207/123G02F1/133524G02B5/04G02F1/1335
Inventor 库尔特·J·霍尔沃森雷蒙德·J·肯尼布莱恩·W·利克肯尼斯·A·P·梅耶尔斯科特·M·塔皮奥迈克尔·E·劳特斯奥勒斯特尔·小本森加里·E·盖德斯
Owner 3M INNOVATIVE PROPERTIES CO
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