| 摘要 |
A light source that uses a light emitting diode with a wavelength converting element is configured to produce a non-uniform angular color distribution, e.g., &Dgr;u′v′>0.015 within an angular distribution from 0° to 90°, that can be used with specific light based device that translate the angular color distribution into a uniform color distribution. The ratio of height and width for the wavelength converting element is selected to produce the desired non-uniform angular color distribution. The use of a controlled angular color non-uniformity in the light source and using it in applications that translate the non-uniformity into a uniform color distribution, e.g., with a uniformity of &Dgr;u′v′<0.01, increases the efficiency of the system compared to conventional systems in which a uniform angular light emitting diode is used.
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