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Electromagnetic-wave shielding and light transmitting plate and display device

a technology of electromagnetic shielding and light transmitting plate, which is applied in the direction of solid cathode, gas-filled discharge tube, synthetic resin layered products, etc., can solve the problems of hard work in laminating the base plate, adverse effect of electromagnetic wave on the human body, and the problem of electromagnetic wave emission from these appliances, etc. problem, to achieve the effect of improving the near infrared ray blocking function, excellent electromagnetic shielding function and excellent durability

Inactive Publication Date: 2002-03-21
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] It is a first object of the present invention to solve the aforementioned problems and thus to provide an electromagnetic-wave shielding and light transmitting plate which solves the aforementioned problems, is suitably used for an electromagnetic-wave shield filter for a PDP, is thin and light, has excellent durability, has excellent electromagnetic-wave shielding function and improved near infrared ray blocking function, and still has high transparency in a range of visible light, thereby displaying distinct pictures.
[0013] It is a second object of the present invention to provide an electromagnetic-wave shielding and light transmitting plate which facilitates the work for laminating filter components, and which has excellent electromagnetic-wave shielding function and impact resistance (hard to be broken).
[0014] It is a third object of the present invention to provide an electromagnetic-wave shielding and light transmitting plate with a near infrared ray blocking film having improved resistance to heat, moisture, and ultraviolet ray.

Problems solved by technology

With the spread of electronic appliances including office automation apparatuses and communication instruments, electromagnetic wave emission from these appliances have come into a problem.
That is, adverse effect of electromagnetic wave to the human body is feared and it is also a problem that the electromagnetic wave affects precision apparatus to cause malfunction.
Accordingly, when used for a filter for a big screen, such a glass plate should be considerably heavy so that it is not only hard work to laminate the base plates but also difficult to secure such laminating work.
However, acrylic resin has a problem about heat resistance, that is, has poor heat resistance and may be easily thermally deformed.

Method used

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Examples

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Embodiment Construction

, Comparative Examples 1, 2

[0124] Materials for forming the near infrared ray blocking layer specified in Table 1 were dissolved into a mixed solvent composed of dichloromethane: 18.5 g, tetrahydrofuran: 37 g, and toluene: 37 g so as to prepare coating liquid, and this coating liquid was applied on a polyethylene film having a width of 200 mm and a thickness of 100 .mu.m and dried at a room temperature so as to form a near infrared ray blocking layer having a thickness of 5 .mu.m. In this manner, each near infrared ray blocking film was prepared.

[0125] Each near infrared ray blocking film thus prepared was kept at 80.degree. C. for 500 hours. The absorbance before and after the experience was measured and the residual ratio of absorbance at 1090 nm was calculated from the following equation:

[0126] Absorbance residual ratio at 1090 nm=Absorbance at 1090 nm after subjected to 80.degree. C. for 500 hours / Initial absorbance at 1090 nm

[0127] Results are shown in Table 1.

1 TABLE 1 Compa...

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Abstract

An electromagnetic-wave shielding and light transmitting plate is thin and light, hard to be broken, and hard to scatter even if broken. Further, the electromagnetic-wave shielding and light transmitting plate has significantly improved electromagnetic-wave shielding function and near infrared ray blocking function so that it can be suitably used as an electromagnetic-wave shielding filter for a PDP, and has high transparency so that distinct pictures are displayed. Furthermore, the electromagnetic-wave shielding and light transmitting plate has durability of near infrared ray blocking function, that is, excellent in resistance to heat, moisture, and ultraviolet ray. The plate has a ransparent base plate 2, an antireflection film 8, a conductive mesh member 3, and a near infrared ray blocking film 5 which are laminated and integrated by adhesive intermediate films 4A, 4B and adhesive agent 4C. The near infrared ray blocking film 5 comprises a base film and a near infrared ray blocking layer on a surface of the base film, wherein said near infrared ray blocking layer contains a near infrared ray absorbing agent composed of diimmonium compound and a copper type antioxidant such as 1,2-benzenethiol copper complex compound.

Description

[0001] This is a continuation application of PCT / JP00 / 08475 filed on Nov. 30, 2000.[0002] The present invention relates to an electromagnetic-wave shielding and light transmitting plate which has excellent electromagnetic-wave shielding characteristics, near infrared ray blocking property and optical transparency and, more particularly, to an electromagnetic-wave shielding and light transmitting plate suitable for a front filter of a PDP (plasma display panel). Further, the present invention relates to a display device, such as a PDP, having the electromagnetic-wave shielding and light transmitting plate.[0003] With the spread of electronic appliances including office automation apparatuses and communication instruments, electromagnetic wave emission from these appliances have come into a problem. That is, adverse effect of electromagnetic wave to the human body is feared and it is also a problem that the electromagnetic wave affects precision apparatus to cause malfunction.[0004] F...

Claims

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Application Information

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IPC IPC(8): B32B27/18G02B5/20G02B5/22G09F9/00H01J11/44H01J17/16H01J29/86H01Q1/52H05K9/00
CPCG02B5/204G02B5/208G02B5/22G02B5/223G02F2001/133331H01J11/44H01J29/868H01J2211/446H01Q1/526H05K9/00H05K9/0096G02F1/133331
Inventor SUGIMACHI, MASATOKOBAYASHI, TAICHI
Owner BRIDGESTONE CORP
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