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Semi-transmitting film, semi-transmitting polarizing film and polarization light source and liquid crystal device with said films

A liquid crystal display device and light source device technology, applied in the direction of optical filters, optics, polarizing elements, etc., can solve the problems of inability to obtain effects, collapse of the polarization state of the optical film 91, and inapplicability of translucent and semi-reflective liquid crystal display devices, etc.

Inactive Publication Date: 2003-07-30
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, this brightness enhancement system is not suitable for known semi-transmissive and semi-reflective liquid crystal display devices.
Please refer to Figure 17 As shown, in the known semi-transmitting and semi-reflecting liquid crystal display device, since there is an optical film 91 having a semi-transmitting and semi-reflecting function between the back side absorbing polarizing film 90 and the light source device 61 or the light guide plate 52 Therefore, when the reflective polarizing film is arranged on the light source device 61 or the light guide plate 52, the polarization state of the optical film 91 will collapse, and the full effect cannot be obtained.

Method used

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  • Semi-transmitting film, semi-transmitting polarizing film and polarization light source and liquid crystal device with said films
  • Semi-transmitting film, semi-transmitting polarizing film and polarization light source and liquid crystal device with said films
  • Semi-transmitting film, semi-transmitting polarizing film and polarization light source and liquid crystal device with said films

Examples

Experimental program
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Effect test

reference example 1

[0124] The light transmittance of HC-TAC having a polymer film having an in-plane retardation value of 4 nm was measured by the following method (A), or the light reflectance was measured by the method (B). In addition, next, the light utilization rate was evaluated by the following (C) method. The results are shown in Table 1.

[0125] (A) Light transmittance

[0126] The total light transmittance was measured using a haze computer (HGM-2DP) manufactured by SuGa Measuring Instrument Co., Ltd.

[0127] (B) Light reflectivity

[0128] The light reflectance was measured using the reflectance and transmittance meter "HR-100" manufactured by Murakami Color Technology Research Institute.

[0129] (C) Light utilization efficiency

[0130] The sum of the measured values ​​of (A) and (B) above is the light utilization efficiency. Moreover, the upper limit of the light utilization efficiency is originally 100%, so the calculated light utilization efficiency may exceed 100%. In th...

example 1

[0132] On the hard skin layer obtained by using HC-TAC in Reference Example 1, an optical multilayer film manufactured by Vacuum Instrument Industry Co., Ltd. was used to form a high-vacuum evaporation device, and niobium oxide, which is an inorganic compound, was deposited by evaporation to form Semi-transparent and semi-reflective layer. At this time, glass for monitoring light transmittance is installed in a reaction chamber, and evaporation is stopped when the initial light transmittance reaches a minimum value. The obtained translucent and semireflective film composed of polymer film / niobium oxide was evaluated by the same method as that of Reference Example 1, and the results are shown in Table 1.

example 2

[0134] Except that the niobium oxide used as the inorganic compound was changed to lead sulfide, the semi-transparent and semi-reflective film was fabricated and evaluated in the same manner as in Example 1. The results are shown in Table 1.

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Abstract

The present invention is to provide a translucent semi-reflective polarizer in which a system to improve luminance including a reflection type polarizer is used and the visibility is improved, and to apply the polarizer to a light source device of polarized light and to a translucent semi-reflective liquid crystal display device. The invention provides a transflective film comprising a polymer film having an in-plane phase retardation value of about 30 nm or less and a transflective layer made of an inorganic compound, wherein the transflective layer is coated on the polymer film and a reflectance of the transflective film is from about 10% to about 95%. When an absorption-type polarizer is laminated to the polymer film side of the transflective film, a transflective polarizer is provided. When a reflection-type polarizer is laminated to the transflective layer side of the transflective film, a transflective polarizer used in a system improving luminance is provided. Using these transflective polarizers, a polarizing light source device and a transflective liquid crystal display device are provided.

Description

technical field [0001] The present invention relates to a translucent and semi-reflective liquid crystal display device that illuminates the display screen from the back in a dark place and uses an external ambient light source to illuminate the display screen in a bright place, and has a better light source device and components. In detail, the semi-transparent and semi-reflective film (film), the semi-transparent and semi-reflective polarizing film, and the polarized light source device and semi-transparent and semi-reflective liquid crystal display device using these films. In the semi-transmissive and semi-reflective liquid crystal display device, it is possible to improve the utilization efficiency of light to brighten the screen, or to prolong the usable time of the battery. Background technique [0002] Liquid crystal display devices are used in various fields due to their advantages of small size and light weight. In liquid crystal display devices, liquid crystal mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/13357
CPCG02F1/13362G02F1/133555C09K2323/03C09K2323/031Y10T428/24355G02F1/1335
Inventor 东浩二本多卓西来拓也
Owner SUMITOMO CHEM CO LTD