High-contrast polaroid

Abstract

The utility model discloses a high-contrast polaroid. The high-contrast polaroid comprises a protective film, an anti-reflection layer, a polarizing layer, a phase compensation layer, a pressure-sensitive adhesive layer and a release film which are sequentially stacked from top to bottom, the polarizing layer comprises a liquid crystal polymer matrix and a nano metal wire grating embedded in the liquid crystal polymer matrix; a preparation material adopted by the phase compensation layer is an optical resin material with a birefringence characteristic; and the anti-reflection layer comprises 5-8 groups of SiO2 layers and Ta2O5 layers which are alternately deposited. According to the utility model, through the innovative layered structure design and material combination, the problems of low contrast ratio, narrow visual angle range, poor weather resistance and the like of the polaroid in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to polarizing sheet technical field especially relates to a high contrast polarizing sheet. BACKGROUND

[0002] As the core optical component of display device, the performance of polarizing sheet directly affects the contrast, color restoration and viewing angle of the screen. The traditional polarizing sheet is usually composed of polyvinyl alcohol (PVA) based polarizing film, pressure sensitive adhesive layer and protective film, but there are the following defects in practical application:

[0003] Limited contrast: the existing polarizing sheet is easily disturbed by reflected light in strong light or complex light environment, resulting in increased dark state brightness and decreased contrast;

[0004] Poor viewing angle performance: the polarization efficiency decreases at large viewing angle, and the contrast decays obviously;

[0005] Insufficient weather resistance: interlayer peeling or optical performance degradation easily occurs in high temperature and high humidity environment.

[0006] For example, the contrast of the traditional polarizing sheet decreases to below 500:1 at 60° viewing angle, and the contrast loss is more than 20% after long time use in high temperature and high humidity environment (60℃ / 90%RH), therefore, the existing polarizing sheet has been difficult to meet higher demand, and needs to be improved. SUMMARY

[0007] The utility model aims at providing a kind of high contrast polarizing sheet, through the innovative stratified structure design and material combination, solve the problems, such as low contrast, narrow viewing angle range and poor weather resistance of polarizing sheet in prior art.

[0008] To achieve the above-mentioned purpose, the following technical solutions are adopted:

[0009] A kind of high contrast polarizing sheet, including from top to bottom sequentially layer arrangement protective film, anti-reflection layer, polarizing layer, phase compensation layer, pressure sensitive adhesive layer and release film;The polarizing layer includes liquid crystal polymer matrix, and the nanometer metal wire grid embedded in liquid crystal polymer matrix;The preparation material of the phase compensation layer is optical resin material with birefringence characteristics;The anti-reflection layer includes 5-8 groups of alternately deposited SiO2 Layer and Ta2O5 Layer.

[0010] Further, the thickness of the polarizing layer is set to 10-50 μm.

[0011] Further, the diameter of the nanometer metal wire grid of the polarizing layer is 40-60 nm, and the wire length is 10-20 μm.

[0012] Further, the birefringence coefficient of the optical resin material is 0.10-0.20.

[0013] Further, the phase compensation layer has a thickness of 10-50 μm.

[0014] Further, the optical resin material is polycarbonate optical resin.

[0015] Further, the single set of SiO2 layer has a thickness of 40-60 nm, and the single set of Ta2O5 layer has a thickness of 25-35 nm.

[0016] Further, the anti-reflection layer has a thickness of 380-420 nm.

[0017] Further, the base material of the protective film and the release film is polyethylene terephthalate film, and the thickness is 50-100 μm.

[0018] Further, the pressure sensitive adhesive layer is acrylate pressure sensitive adhesive, and the thickness is 10-30 μm.

[0019] By using the above scheme, the present application has the following beneficial effects:

[0020] The polarizing layer comprises a liquid crystal polymer base body and a nano metal wire grid embedded in the liquid crystal polymer base body, the nano metal wire grid can accurately select and control the polarization direction of light, the liquid crystal polymer has unique optical anisotropy, and the polarization effect is further enhanced, meanwhile, the phase compensation layer is made of optical resin material with birefringence characteristics, can adjust the phase of light passing through the polarizing layer, optimize the polarization state and interference effect of light, reduce light scattering and reflection, and further improve the definition and contrast of images. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 1 is a structural schematic view of the present application;

[0022] Among them, the drawing mark explanation:

[0023] 1, protective film; 2, anti-reflection layer; 3, polarizing layer; 4, phase compensation layer; 5, pressure sensitive adhesive layer; 6, release film. DETAILED DESCRIPTION

[0024] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0025] Reference Figure 1As shown, this utility model provides a high-contrast polarizer. In one embodiment, it includes a protective film 1, an anti-reflection layer 2, a polarizing layer 3, a phase compensation layer 4, a pressure-sensitive adhesive layer 5, and a release film 6, which are stacked sequentially from top to bottom. The polarizing layer 3 includes a liquid crystal polymer matrix and a nano-metal grid embedded in the liquid crystal polymer matrix. The phase compensation layer 4 is prepared using an optical resin material with birefringence properties. The anti-reflection layer 2 includes 5-8 sets of alternately deposited SiO2 layers and Ta2O5 layers.

[0026] In this embodiment, the polarizer structure adopts a stacked structure, such as... Figure 1 As shown, from top to bottom, the layers are: protective film 1, anti-reflection layer 2, polarizing layer 3, phase compensation layer 4, pressure-sensitive adhesive layer 5, and release film 6. Among them, the polarizing layer 3 is a specially designed polarizing layer and is the core functional layer of the polarizer. This layer is composed of liquid crystal polymer material and nano-metal grid. The nano-grid can precisely select and control the polarization direction of light, further enhancing the polarization effect. In a preferred embodiment, the thickness of the polarizing layer 3 is set to 10-50 μm, the diameter of the nano-metal grid of the polarizing layer 3 is 40-60 nm, and the line length is 10-20 μm. The polarization efficiency is improved by the synergistic effect of the polarization selectivity of the nano-grid and the optical anisotropy of the liquid crystal polymer.

[0027] The phase compensation layer 4 is made of an optical resin material with specific birefringence properties, which can adjust the phase of the light transmitted through the polarizing layer 3, optimize the polarization state and interference effect of the light, reduce light scattering and reflection, and thus improve the clarity and contrast of the image. In a preferred embodiment, the thickness of the phase compensation layer 4 is set to 10-50 μm, and the birefringence coefficient of the optical resin material is 0.10-0.20. Preferably, the optical resin material is polycarbonate optical resin.

[0028] For the anti-reflection layer 2, this layer is made of low-refractive-index and high-refractive-index materials, which are alternately deposited on the outermost layer of the polarizer by chemical vapor deposition according to design requirements. By precisely controlling the thickness and deposition rate of each material layer, effective interference cancellation of reflected light is achieved to form an anti-reflection coating. In a preferred embodiment, it is composed of alternately deposited low-refractive-index material SiO2 and high-refractive-index material Ta2O5, with a total of 5-8 layers. The thickness of a single SiO2 layer is 40-60 nm, and the thickness of a single Ta2O5 layer is 25-35 nm. The interference effect suppresses surface reflected light. Preferably, the thickness of the anti-reflection layer 2 is 380-420 nm.

[0029] For the pressure sensitive adhesive layer 5, an acrylate pressure sensitive adhesive can be used, with a thickness of 10-30 μm, for bonding the polarizing sheet to the display panel; at the same time, for the protective film 1 and the release film 6, the base material is polyethylene terephthalate film, with a thickness of 50-100 μm, wherein the protective film 1 is used for protecting the internal functional layer from mechanical damage, and the release film 6 is used for temporarily covering the pressure sensitive adhesive layer 5 until use.

[0030] The preferred embodiments of the present application have been described above with the preferred embodiments, but are not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-contrast polarizer, characterized in that, The material comprises, from top to bottom, a protective film, an anti-reflection layer, a polarizing layer, a phase compensation layer, a pressure-sensitive adhesive layer, and a release film; the polarizing layer comprises a liquid crystal polymer matrix and a nano-metal grid embedded in the liquid crystal polymer matrix; the phase compensation layer is prepared using an optical resin material with birefringence properties; the anti-reflection layer comprises 5-8 sets of alternately deposited SiO2 layers and Ta2O5 layers.

2. The high-contrast polarizer according to claim 1, characterized in that, The thickness of the polarizing layer is set to 10-50 μm.

3. The high-contrast polarizer according to claim 2, characterized in that, The polarizing layer has a diameter of 40-60 nm and a line length of 10-20 μm.

4. The high-contrast polarizer according to claim 1, characterized in that, The birefringence of the optical resin material is 0.10-0.

20.

5. The high-contrast polarizer according to claim 4, characterized in that, The thickness of the phase compensation layer is 10-50 μm.

6. The high-contrast polarizer according to claim 1, characterized in that, The optical resin material is polycarbonate optical resin.

7. The high-contrast polarizer according to claim 1, characterized in that, The thickness of a single SiO2 layer is 40-60 nm, and the thickness of a single Ta2O5 layer is 25-35 nm.

8. The high-contrast polarizer according to claim 1, characterized in that, The thickness of the anti-reflective layer is 380-420 nm.

9. The high-contrast polarizer according to claim 1, characterized in that, The substrate of the protective film and release film is a polyethylene terephthalate film with a thickness of 50-100 μm.

10. The high-contrast polarizer according to claim 1, characterized in that, The pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive with a thickness of 10-30 μm.

Images