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White polyester film for light reflective plate

A technology of polyester film and light reflection, which is applied in optics, optical components, nonlinear optics, etc., can solve the problems of reduced screen brightness, poor energy efficiency, low reflection efficiency, etc., and achieve the effect of improving reflectivity and brightness

Active Publication Date: 2011-09-07
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, if the reflection efficiency of the reflector is low, and there are elements that cause light leakage and attenuation in the system, the energy efficiency will deteriorate due to light loss due to repeated reflection, so the brightness of the screen will decrease, and the economic efficiency will decrease. Wait

Method used

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  • White polyester film for light reflective plate
  • White polyester film for light reflective plate
  • White polyester film for light reflective plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] As a catalyst used in the polymerization of polyethylene terephthalate, the total amount of Sb, K, P, Mg, Li, Ca, Ge, and Ti compounds relative to 1 ton of polyethylene terephthalate is 2.985 moles, using polyethylene glycol with a molecular weight of 4000, and using polyethylene terephthalate with a color tone (JIS-K7105) of 62.8 L value, 0.5 b value, and 0.2% turbidity after polymerization. Ethylene dicarboxylate, prepared and mixed with 65 parts by weight of polyethylene terephthalate, 5 weights of (PBT / PTMG) copolymer of polybutylene terephthalate and polybutylene 1,4-diol Parts (trade name: Hitoray manufactured by Toraydyne Co., Ltd.), 10 mol% isophthalic acid and 5 mol% copolymer of polyethylene glycol with a molecular weight of 1000 and polyethylene terephthalate (PET / I / PEG) 10 parts by weight and 20 parts by weight of polymethylpentene, dried at 180°C for 3 hours, and then supplied to extruder B (layer B) heated to 270-300°C.

[0190] On the other hand, 98 parts ...

Embodiment 2

[0192] Except that the composition of the polyester layer (A) was as described in Table 1, the same method as in Example 1 was used to obtain a film with a thickness of 300 μm. The gloss (60°) of the obtained film was 120%, and the physical properties as a substrate for a direct-type liquid crystal display reflector are shown in Table 1. High brightness is obtained in the direct type method.

Embodiment 3

[0194] Except that the composition of the polyester layer (A) was as described in Table 1, the same method as in Example 1 was used to obtain a film with a thickness of 300 μm. The gloss (60°) of the obtained film was 42%, and the physical properties as a substrate for a liquid crystal display reflector are shown in Table 1. Very high brightness is obtained in the direct mode.

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Abstract

The present invention provides a white polyester film for a liquid crystal display reflective plate, which, when used in side light-type liquid crystal displays and downright-type liquid crystal displays, can realize a high level of brightness. [MEANS FOR SOLVING PROBLEMS] A white polyester film for a light reflective plate, comprising a white polyester film having a thickness of not less than 200 mu, wherein, in at least one side (side A) of the white polyester film, when the wavelength dependency of spectral reflectance at a wavelength of 450 to 600 nm is approximated according to the following formula by a least square method, M is M = -0.0110 (% / nm), and R560 = 100 (%). Approximation formula R = M x lambda + B wherein R: light reflectance, %; lambda: wavelength of light, nm; M: wavelength coefficient, % / nm; B: constant, %; and R560: estimated reflectance obtained by introducing lambda = 560 into the approximation formula, %.

Description

Technical field [0001] The present invention relates to a white polyester film for light reflection plates. In particular, it is used for reflectors for small inverse prism-type liquid crystal displays such as notebook computers and mobile phones, for side-light source liquid crystal displays using the conventional BEF system, and for direct-type liquid crystal displays such as flat-panel TVs. The LCD reflector used in the reflector uses white polyester film. Furthermore, it relates to an ultra-white polyester film excellent in blue light reflection characteristics. Background technique [0002] As a light source of a liquid crystal display, a backlight type that irradiates light from the back side of the display, and a light reflective film shown in Patent Document 1, have been widely used because they are thin and can provide uniform illumination. At this time, in order to prevent the illumination light from escaping to the back of the screen, a light reflective plate mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/08B32B27/36C08J5/18C08J7/04G02F1/1335C08J7/043
CPCG02B5/0226B32B27/18G02B5/0284C08J5/18C08J7/047C08J2367/02B32B27/36G02F1/133605G02B5/045G02B5/08Y10T428/254Y10T428/25Y10T428/24942Y10T428/256Y10T428/31786C08J7/0427C09K2323/00C08J7/043
Inventor 藤井秀树田中和典奥田昌宽
Owner TORAY IND INC