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Light source-side polarizing plate for liquid crystal display device, and liquid crystal display device comprising same

A technology of liquid crystal display device and polarizing plate, which can be used in polarizing elements, optics, optical elements, etc., and can solve problems such as expensive

Pending Publication Date: 2019-06-14
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TAC membranes are more expensive than typical polymer membranes

Method used

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  • Light source-side polarizing plate for liquid crystal display device, and liquid crystal display device comprising same
  • Light source-side polarizing plate for liquid crystal display device, and liquid crystal display device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082]A polarizer was prepared by stretching a polyvinyl alcohol film (VF-PS6000, Kuraray Co., Ltd., thickness: 60 μm) to 3 times its original length at 60 °C, dyed the stretched film with iodine, and The dyed film was stretched to 2.5 times the length of the stretched film in a boric acid solution at °C to prepare a polarizing plate.

[0083] A film prepared by melt extrusion of polyethylene terephthalate (PET) resin was stretched in MD to 3 times its original length while mechanically moving the film in MD, and then the film was stretched in MD to three times its original length to prepare a polyethylene terephthalate film. At a wavelength of 550 nm, the thickness of the polyethylene terephthalate film was 40 μm, Re according to Formula 3 was 185 nm, Rth according to Formula 4 was 6,800 nm, and NZ according to Formula 5 was 19. The prepared polyethylene terephthalate film was used as a base material of the first protective film. Re, NZ and Rth were measured at a wavelength...

Embodiment 2 to 4

[0087] A polarizing plate was prepared by the same method as in Example 1, except that the refractive index and retardation of the polyethylene terephthalate film were changed as listed in Table 1, and the first primer layer and the second The refractive index or thickness of the primer layer.

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Abstract

The present invention provides a light source-side polarizing plate for a liquid crystal display device, and a liquid crystal display device comprising the same, the polarizing plate comprising a polarizer and a protective film formed on a light incident surface of the polarizer, wherein the protective film includes a first primer layer, a protective film substrate, and a second primer layer, which are sequentially laminated on the polarizer, and when a refractive index of the second primer layer is np2, a refractive index of the first primer layer is np1, and refractive indexes of the protective film substrate in x-axis and y-axis directions are nx and ny, the protective film has a relation of equation 1 or 2, each of the first primer layer and the second primer layer has a thickness of 60nm to 120nm, the refractive index difference np1-np2 of the first primer layer and the second primer layer is larger than 0 and equal to or smaller than 0.1, and the protective film substrate has a value of |nx-ny| which is larger than 0 and equal to or smaller than 0.01.

Description

technical field [0001] The present invention relates to a light source side polarizing plate used in a liquid crystal display device and a liquid crystal display device including the light source side polarizing plate. Background technique [0002] Polarizing plates are disposed on the upper and lower surfaces of the liquid crystal panel to control the oscillation direction of light to visualize display patterns of the liquid crystal display device. The polarizing plate includes a polarizing plate and a protective film formed on at least one surface of the polarizing plate. The protective film is usually formed of a triacetyl cellulose (TAC) film. TAC membranes are more expensive than typical polymer membranes. In place of the TAC film, an inexpensive polyester-based polymer film including a polyethylene terephthalate (PET) film or the like is used. [0003] The light source side polarizing plate disposed between the liquid crystal panel and the backlight unit transmits l...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/04G02B1/14
CPCG02F1/133502G02F1/133528G02F2202/40G02B1/04G02B5/30G02B1/14G02F1/133567G02B5/3041G02F1/1339
Inventor 朴锡珍
Owner SAMSUNG SDI CO LTD
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