Light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths
First Claim
1. A light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths, comprising:
- a first light emitting device;
a second light emitting device having an oscillation wavelength different from that of said first light emitting device;
a power supply node for applying a voltage to said first light emitting device and said second light emitting device; and
a modulation circuit for adjusting a lighting time of each of said first light emitting device and said second light emitting device by controlling an ON/OFF state of a current flowing through each of said first light emitting device and said second light emitting device to obtain desired intensity of mixed light from said first light emitting device and said second light emitting device;
wherein a value of a current flowing from said power supply node into each of said first light emitting device and said second light emitting device is gradually changed to adjust chromaticity of mixed light from said first light emitting device and said second light emitting device to obtain a desired white color.
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Accused Products
Abstract
A current of the same amount or in a constant ratio is applied to each of a combination of a blue light emitting diode having a small wavelength variation and a green light emitting diode having a large wavelength variation. With this, as an amount of applied current increases, an oscillation wavelength of the green light emitting diode having the large wavelength variation changes from a long wavelength side to a short wavelength side and mixes with a blue color of the blue light emitting diode having the small wavelength variation to gradually change chromaticity as a whole. When desired chromaticity is obtained, the amount of the current is fixed.
22 Citations
19 Claims
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1. A light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths, comprising:
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a first light emitting device; a second light emitting device having an oscillation wavelength different from that of said first light emitting device; a power supply node for applying a voltage to said first light emitting device and said second light emitting device; and a modulation circuit for adjusting a lighting time of each of said first light emitting device and said second light emitting device by controlling an ON/OFF state of a current flowing through each of said first light emitting device and said second light emitting device to obtain desired intensity of mixed light from said first light emitting device and said second light emitting device; wherein a value of a current flowing from said power supply node into each of said first light emitting device and said second light emitting device is gradually changed to adjust chromaticity of mixed light from said first light emitting device and said second light emitting device to obtain a desired white color. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light emitting apparatus generating white light by mixing of light of a plurality of oscillation wavelengths, comprising:
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a light emitting device for emitting light of a plurality of different oscillation wavelengths; a power supply node far applying a voltage to said light emitting device; and a variable resistance for adjusting a value of a current flowing through said light emitting device; wherein a value of a current flowing from said power supply node into said light emitting device is gradually changed to adjust chromaticity of mixed light resulting from the plurality of different oscillation wavelengths of said light emitting device to obtain a desired white color; and wherein a resistance value of said variable resistance is adjusted to obtain chromaticity of mixed light resulting from the plurality of different wavelengths of said light emitting device corresponding to the desired white color. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification