Sheets for plasma display panels and process for producing...

Optical: systems and elements – Glare or unwanted light reduction – Directional or angular discrimination

Reexamination Certificate

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C359S614000, C428S212000

Reexamination Certificate

active

07083292

ABSTRACT:
A PDP resin sheet11capable of transmitting a rectilinear light is prepared by alternately arranging a transparent section12and a dark section13in the direction of the sheet surface. The transparent section12and the dark section13may be formed perpendicular or inclined to the sheet surface, respectively. In the sheet11, the thickness T of the sheet may be about 0.12 to 0.25 mm, and the angle of the dark section13to the sheet surface may be about 70 to 90°. In addition, the ratio [P/T] of the periodical width P of the dark section relative to the thickness T of the sheet may be about 1/1 to 1/2, and the ratio [W1/W2] of the width W1of the transparent section relative to the width W2of the dark section may be about 30/1 to 10/1. Soft resins constituting the transparent section and the dark section may for example be an olefinic resin (particularly an ethylene-vinyl ester copolymer). Such a PDP sheet ensures an image display at high contrast even under a daylight environment, without reducing a plasma display luminance.

REFERENCES:
patent: 4128685 (1978-12-01), Lowrey et al.
patent: 5254388 (1993-10-01), Melby et al.
patent: 53-70834 (1978-06-01), None
patent: 6-504627 (1994-05-01), None
patent: 2002-196128 (2002-07-01), None
patent: 2002-319351 (2002-10-01), None
patent: WO 92/11549 (1992-07-01), None

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