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Reflective polarizer sheet

A polarizer, reflective technology, applied in the field of optical films, can solve problems such as color shift

Inactive Publication Date: 2010-01-20
ETERNAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the optical anisotropy of the cholesteric liquid crystal reflective polarizer, the color of the reflected light will change with the viewing angle, resulting in The so-called color shift (chromaticity difference) problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0077] Here, experimental examples and comparative examples of preparation of adhesive layer compositions will be described. The adhesive layer composition is divided into three categories, namely, a composition without blue colorant, a composition with blue colorant added, and a composition with blue colorant and microbeads added. The preparation method is as follows:

[0078] 1. Composition without blue pigment (composition A):

[0079] Mix the adhesive (acrylic resin pressure-sensitive adhesive, AO-802, produced by Eternal Company) with the solvent (ethyl acetate) and stir evenly (solid content is 25%), and prepare the composition A of the adhesive layer, such as Table 1 shows.

[0080] 2. Add the composition of blue pigment (composition B-E):

[0081] Dissolve the blue dye (D-96, produced by Ciba Company) in the solvent (ethyl acetate), and then mix it with the adhesive (acrylic resin pressure-sensitive adhesive, AO-802, produced by Eternal Company) and mix evenly (solid...

experiment example 5

[0112] The values ​​of ΔX0° and ΔX60° of Experimental Example 5 are significantly smaller than the values ​​of ΔX0° and ΔX60° of Comparative Example 2. It shows that adding blue dye and microbeads to the adhesive layer at the same time can improve the effect of color difference comparable to the reflective polarizer with a large amount of blue dye added to the adhesive layer (Experimental Example 4).

[0113] From the values ​​of ΔX0° and ΔX60° in Experimental Examples 6-8, it can be known that the formation of light-condensing microstructures on the surface of the reflective polarizer can further reduce the chromaticity difference caused when the reflective polarizer is applied to the backlight module, and Reduce the chromaticity difference between large horizontal viewing angle (60°) and normal viewing angle (0°). Especially in reducing the chromaticity difference between normal viewing angles (0°), its performance is particularly remarkable.

[0114]It can be seen from the...

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Abstract

The invention provides a reflective polarizer sheet which comprises a cholesterol liquid crystal layer, a phase difference membrane with a 1 / 4 wave length and a bonding layer. The bonding layer is positioned between the cholesterol liquid crystal layer and the phase difference membrane with the 1 / 4 wave length; and a jointing agent and blue pigment are included in the bonding layer. The blue pigment is added in the bonding layer of the reflective polarizer sheet so as to compensate the color problem caused by the reflective polarizer sheet self and a large horizontal viewing angle. A micro bead can be added in the bonding layer of the reflective polarizer sheet or a condenser micro-structure is configured on the outer side of the phase difference membrane with the 1 / 4 wave length so as to further improve the color problem caused by the reflective polarizer sheet self and the large horizontal viewing angle.

Description

technical field [0001] The invention relates to an optical film, especially a reflective polarizer, which can improve the utilization rate of light source and reduce the optical color shift of different viewing angles. Background technique [0002] Among flat-panel displays, liquid crystal displays are the only ones that use linearly polarized light to create bright, dark, and gray scales. Generally speaking, the main structure of a liquid crystal display ("LCD" for short) includes a liquid crystal display panel and a backlight module. Therefore, the basic principle of its display screen is that the light is provided by the backlight module, and then the light generates linearly polarized light after passing through the polarizer. Then, with the arrangement and twist of the liquid crystal molecules in the liquid crystal display panel, bright and dark changes occur, and a rich picture is displayed. [0003] However, the total brightness of the current liquid crystal display...

Claims

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Application Information

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IPC IPC(8): G02B5/30F21V8/00G02F1/1335
Inventor 孙郁明廖钦义
Owner ETERNAL MATERIALS CO LTD
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