Image display device and evaluating method of glass substrate for use in it
a technology of image display device and glass substrate, which is applied in the direction of electromagnetic radiation sensing, identification means, instruments, etc., can solve the problems of glass substrate yellowing, disadvantageous formation of a layer on the surface of glass substrate, yellowing of glass substrate, etc., and achieves high image display quality, easy and efficient selection, and high image display quality
Inactive Publication Date: 2008-02-28
ADACHI DAISUKE +2
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Benefits of technology
The present invention is an image display device that uses a glass substrate with low reflectance at a specific wavelength. This prevents the glass substrate from yellowing and improves the image display quality. The evaluating method of the glass substrate involves analyzing the content of a specific element in the glass substrate. This allows for easy selection of a glass substrate that does not yellow and provides an optimal glass substrate for the image display device.
Problems solved by technology
When an Ag electrode made of silver material is formed on a float glass substrate manufactured by the float method, however, a colored layer is disadvantageously formed on the surface of the glass substrate and the glass substrate changes into yellow (yellows).
When the glass substrate, especially the front-side glass substrate, yellows, the yellowing is fatal in the image display device.
Due to the yellowing of the glass substrate, the panel looks yellow, the commercial value decreases, display brightness of blue decreases to change display chromaticity, and, color temperature decreases to degrade picture quality especially in displaying white.
These problems occur not only in a PDP but also in a general image display device having a structure where an Ag electrode is formed on a glass substrate.
Method used
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[0034] An exemplary embodiment of the present invention will be described with reference to the drawings.
[0035] A PDP is hereinafter described as an example of image display devices. However, the present invention is useful for an image display device having a structure where an electrode made of Ag material is disposed on a glass substrate that is manufactured by the float method and has Sn++ on its surface.
[0036]FIG. 1 is a sectional and perspective view showing a schematic structure of the PDP. PDP 1 is formed of two glass substrates: front-side glass substrate 3 for displaying an image; and back-side glass substrate 10 facing the front-side glass substrate.
[0037] Front substrate 2 of PDP 1 has the following elements: [0038] display electrodes 6 that are formed on one principal surface of front-side glass substrate 3 and include scan electrode 4 and sustain electrode 5; [0039] dielectric layer 7 for covering display electrodes 6; and [0040] protective layer 8, made of MgO for ...
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Abstract
The present invention provides an image display device capable of displaying a good image by suppressing yellowing of a glass substrate, and an evaluating method of the glass substrate. The image display device is formed using the glass substrate where reflectance at wavelength of 220 nm is 5% or lower. In the evaluating method of the glass substrate for the image display device, Sn++ content in the glass substrate is analyzed using reflectance at wavelength of 220 nm.
Description
[0001] This application is a divisional of application Ser. No. 10 / 499,339, which is the National Stage of International Application No. PCT / JP2003 / 015123, filed Nov. 27, 2003.TECHNICAL FIELD [0002] The present invention relates to an image display device such as a plasma display panel (PDP) and an evaluating method of a glass substrate for use in it. BACKGROUND ART [0003] There are various types of image display devices for displaying a high definition television image on a large screen. PDPs belong to one of the various types. A PDP is hereinafter described as an example. [0004] A PDP is formed of two glass substrates: a front-side glass substrate for displaying an image; and a back-side glass substrate facing the front-side glass substrate. The front-side glass substrate has the following elements: [0005] a display electrode that is formed on one principal surface thereof and includes a stripe-like transparent electrode and a bus electrode; [0006] a dielectric film that covers th...
Claims
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IPC IPC(8): G02B1/00H01J11/44G01N21/33G09F9/30H01J17/16H01J17/49
CPCH01J11/12H01J11/34Y10S359/90H01J2211/442H01J11/44G01N21/33G09F9/30
Inventor ADACHI, DAISUKETSUJI, HIROYASUSUMIDA, KEISUKE
Owner ADACHI DAISUKE