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Optical compensation membrane for liquid crystal display

A technology of optical compensation film and liquid crystal display, which is applied in the field of optical compensation film and can solve the problems of difficult preparation and the like

Inactive Publication Date: 2009-05-06
FAR EASTERN NEW CENTURY COPRRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the orientation of the optical axis of the C-plate is perpendicular to the plane of the plate, it is difficult to prepare, therefore, it is necessary to provide a C-plate that is easier to manufacture

Method used

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  • Optical compensation membrane for liquid crystal display
  • Optical compensation membrane for liquid crystal display
  • Optical compensation membrane for liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The PVA samples of Example 1 were prepared by the following sequential steps:

[0072] (1). The preparation degree of polymerization is 2600 and the degree of saponification is 98mol% of PVA ester particles;

[0073] (2). At a temperature of 80°C to 95°C, add PVA ester grains to water to dissolve the ester grains;

[0074] (3). Add methanol to the solution of (2) until the ratio of methanol to water is about 1:5 (at this time, the solid content of PVA is 8-10%), and obtain the first solution;

[0075] (4). At a temperature of 40°C to 70°C, the crosslinking agent melamine formaldehyde (purchased from Cytec Company, product name cymel 303) and the catalyst p-toluenesulfonic acid are mixed and stirred for 15min to 1hr to obtain the second Solution (wherein, by weight, the consumption of cross-linking agent is 25wt% of PVA, and the consumption of catalyst is 6.25wt% of PVA);

[0076] (5). Add the second solution to the first solution and stir for 30min to 1hr to obtain a ...

Embodiment 2

[0098] In this example, the C plate prepared in Example 1 is used to make a TN-LCD, and the measured viewing angles are listed in Table 2, Figure 4 It is the equal contrast curve figure of embodiment 2.

[0099] Table 2

[0100]

Embodiment 3

[0102] Embodiment 3 is prepared in the same manner as Example 1, but the degree of polymerization of the PVA used in Embodiment 3 is respectively 3800, and the test results are also shown in Table 2, and the obtained equal contrast curves are as follows Figure 5 shown.

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Abstract

The invention discloses an optical compensating film, which is characterized by the following: C plate is made of polymer in connection with the liquid crystal box, whose thickness is ranged from 5 to 60 mum; the polymer is polyvinyl alcohol with polymerization degree ranged from 2000 to 5000, which displays cross-linking to make the optic axis of C plate parallel the common light inlet direction as well as more than 60 nm to delay the plate phase along the thickness direction.

Description

technical field [0001] The present invention provides an optical compensation film (optical compensator) for liquid crystal display, especially relates to a kind of optical compensation film with negative uniaxial birefringent plate (negative uniaxial birefringent plate), the thickness of the negative uniaxial birefringent plate It is between 5 and 60 μm and is cross-linked and made of polyvinyl alcohol with a degree of polymerization greater than 2000 and less than 5000. Background technique [0002] Known optical compensation films are used to correct phase retardation of a liquid crystal cell (LC cell) or a polarizer of a liquid crystal display. Here are a few examples of compensation films commonly used in liquid crystal displays. The C-plate has an extraordinary axis or an optical axis that is perpendicular to the plane of the plate or parallel to the direction of incident light. A-plate is a uniaxial birefringent plate and is used to compensate light leakage of liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13363G02F1/1335G02F1/133
Inventor 游在安林必松陈智仁黄久芳林文逸
Owner FAR EASTERN NEW CENTURY COPRRATION