US 7,320,534 B2Granted

Display device

AssigneesMurakami Corporation, Nippon Seiki Co., Ltd.

InventorsTomohiko Sugikawa, Keiichi Nagano, Yuichi Takahashi, Teruko Yokoo

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Abstract

Disclosed is a display device at a low cost which enhances the color purity of light to be projected, and which resists deterioration due to ambient light such as infrared ray. This display device includes an LED, an optical member for selectively outputting light components, of which wavelength is a predetermined minimum-limit wavelength or longer, from incident light, and a mirror for selectively reflecting light components, of which wavelength is a predetermined maximum-limit wavelength or shorter, from irradiated light. One of the optical member or the mirror receives light directly from the LED, and outputs it to the other. Subsequently, the other receives the light from one of the optical member and the mirror, and outputs it.

Claims20

Dependent claims

A display device for projecting an image, comprising:

an LED for emitting light;
an optical member which selectively outputs light components having wavelengths not shorter than a predetermined minimum-limit wavelength, the minimum-limit wavelength being shorter than a peak wavelength of the light from the LED and lying within a FWHM of the light from the LED;
and
a mirror which selectively reflects light components having wavelengths not longer than a predetermined maximum-limit wavelength, the maximum-limit wavelength being longer than the peak wavelength of the light from the LED and lying within the FWHM of the light from the LED,
wherein one of the optical member and the mirror is positioned to receive the light from the LED and to output or reflect the light components having the wavelengths not shorter than the minimum-limit wavelength or the light components having the wavelengths not longer than the maximum-limit wavelength to the other one of the optical member and the mirror.

2 more elements

Dependencies are inferred from the claim text.