US RE45,442 E1 · Multiple wavelength light emitting device, electronic apparatus, and interference mirror

Abstract

A multiple wavelength light emitting device is provided wherewith the resonance strength and directivity between colors can be easily adjusted for balance. This light emitting device comprises a light emission means 4 for emitting light containing wavelength components to be output, and a semi-reflecting layer group 2 wherein semi-reflecting layers 2R, 2G, and 2B that transmit some light having specific wavelengths emitted from the light emission means and reflect the remainder are stacked up in order in the direction of light advance in association with wavelengths of light to be output. Light emission regions AR, AG, and AB are determined in association with the wavelengths of light to be output. The configuration is such that, in the light emission regions, the distances LR, LG and LB between a reflecting surface for fight from the light emission means side of the semi-reflecting layers 2R, 2G, and 2B that reflect light output from those light emission regions and a point existing in an interval from the end of the light emitting layer on the semi-reflecting layer group side to the reflecting layer are adjusted so as to have an optical path length at which that light resonates.

Claims50

Dependent claims

A multiple wavelength light emitting device for emitting light of a plurality of differing wavelengths comprising:

light emission means for emitting light containing wavelength components to be output;
a reflecting layer placed in proximity to said light emission means;
a semi-reflecting layer group opposite said reflecting layer with said light emission means therebetween, the semi-reflecting layer group having semi-reflecting layers that reflect some light emitted from said light emission means having specific wavelengths and that transmit the remainder of the light emitted from said light emission means, stacked in order, in a direction of light advance so as to correspond with light wavelengths to be output;
and
two or more light emission regions wherein the wavelength of the output light differs wherein:
the distance between the reflecting layer for light from the light emission means side of the semi-reflecting layer group that partially reflects light output from that light emission region and a point at which light is emitted, existing in an interval from an end surface of said light emission means on the semi-reflecting layer group side to a surface of said reflecting layer, is adjusted so as to have an optical path length such that light of the wavelength output from that light emission region resonates,
wherein said point in the interval from the end surface of said light emission means on the semi-reflecting layer group side to the surface of said reflecting layer is a light emission point in said light emission means.

4 more elements

A multiple wavelength light emitting device that comprises a plurality of light emission regions that emit lights of wavelengths corresponding to mutually different colors, comprising:

a first light emission means provided in a first light emission region, the first light emission means emitting a first color light that has a first wave length;
a second light emission means provided in a second light emission region, the second light emission means emitting a second color light that has a second wave length which is different from the first wave length;
a reflecting layer placed opposite to the first and second light emission means;
a semi-reflecting layer group placed so as to be opposite to the first and second light emission means on a side opposite to the reflecting layer with respect to the first and second light emission means, and formed by stacking a first semi-reflecting layer and a second semi-reflecting layer, the first semi-reflecting layer having a first reflecting surface configured to reflect primarily the first color light emitted by the first light emission means, the second semi-reflecting layer having a second reflecting surface configured to reflect primarily the second color light emitted by the second light emission means;
a first distance between the first reflecting surface of the first semi-reflecting layer in the first light emission region and a first point in the first light emission means being a distance that resonates the first color light to be emitted by the first light emission region;
and
a second distance between the second reflecting surface of the second semi-reflecting layer in the second light emission region and a second point in the second light emission means being a distance that resonates the second color light to be emitted by the second light emission region,
the first point existing in an interval from an end surface of the first light emission means on the semi-reflecting layer group side to a surface of the reflecting layer,
the second point existing in an interval from an end surface of the second light emission means on the semi-reflecting layer group side to the surface of the reflecting layer.

6 more elements

Dependencies are inferred from the claim text.

Multiple wavelength light emitting device, electronic apparatus, and interference mirror

Life of this patent

Multiple wavelength light emitting device, electronic apparatus, and interference mirror

Life of this patent

Abstract

Claims50