Light source device and projection display method
AssigneeAppotronics China Corporation
InventorsYi Li, Yi Yang
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Abstract
The present invention discloses a method and apparatus for a projection system using a solid-state light source and a color wheel. A set of primary light sources (such as RGB light source) with a light source controller is utilized to replace the UHP lamp. The color wheel has multiple color filter segments that are sequentially disposed on the path of the light when the wheel rotates. Based on a sync signal received from the rotating color wheel, the light source controller sequentially turns the primary light sources on and off in accordance with the sequence of the color filter segments of the color wheel. During each of the spoke periods, to generate a varying mixture of the two color lights, at least two primary color light sources are turned on simultaneously.
Claims20
A light source device comprising:
- a first solid state light source for generating a first color light;
- a second solid state light source for generating a second color light;
- a light combining device for receiving the first and second color lights and combining them into a combined light beam;
- a color filter device disposed to receive a light spot generated by the combined light beam, including a first filter segment transmitting at least a portion of the first color light and a second filter segment transmitting at least a portion of the second color light, wherein portions of the first and second filter segments define one or more spoke ranges located near one or more boundaries between adjacent ones of the first and second filter segments, including a first spoke range located near a first boundary between the first and second filter segments;
- a drive mechanism for driving the color filter device to move periodically, wherein the first and second filter segments and the first spoke range are alternately disposed on a path of the combined light beam to be illuminated by the light spot when the color filter device moves;
- and
- a light source control device for controlling the first and second light sources, wherein the light source control device turns on only the first light source when at least a portion of the light spot is located in the first filter segment outside of any spoke range, turns on only the second light source when at least a portion of the light spot is located in the second filter segment outside of any spoke range, and turns on both the first and the second light sources when the light spot is located entirely in the first spoke range.
A method for providing a light source comprising:
- generating a first color light using a first solid state light source;
- generating a second color light using a second solid state light source;
- combining the first and second color lights into a combined light beam using a light combining device;
- providing a color filter device disposed to receive a light spot generated by the combined light beam, the color filter including a first filter segment transmitting at least a portion of the first color light and a second filter segment transmitting at least a portion of the second color light, wherein portions of the first and second filter segments define one or more spoke ranges located near one or more boundaries between adjacent ones of the first and second filter segments, including a first spoke range located near a first boundary between the first and second filter segments;
- moving the color filter device periodically, wherein the first and second filter segments and the first spoke range are alternately disposed on a path of the combined light beam to be illuminated by the light spot when the color filter device moves;
- and
- controlling the first and second light sources using a light source control device, including:
- turning on only the first light source when at least a portion of the light spot is located in the first filter segment outside of any spoke range, turning on only the second light source when at least a portion of the light spot is located in the second filter segment outside of any spoke range, and turning on both the first and the second light sources when the light spot is located entirely in the first spoke range.
Dependencies are inferred from the claim text.