Color wheel apparatus and optical engine having the same
Disclosed is a color wheel apparatus for a DLP type display device having a color wheel unit, which has a color filter and a rotation part for supporting the color filter and rotating integrally with the color filter; a color wheel supporter for rotatably supporting the color wheel unit; a sensor having a light emitter provided in the color wheel supporter and emitting light to the rotation part, and a light receiver to receive the light reflected from the rotation part; and an index part patterned on a predetermined region of a circumference of the rotation part to irregularly reflect the light emitted from the light emitter.
1. A color wheel apparatus for a digital light processing (DLP) type display apparatus, comprising:
a color wheel unit comprising a color filter and a rotation part for supporting the color filter and rotating integrally with the color filter;
a color wheel supporter for rotatably supporting the color wheel unit;
a sensor comprising a light emitter provided in the color wheel supporter for emitting light to the rotation part, and a light receiver for receiving the light reflected from the rotation part; and
an index part patterned on a predetermined region of a circumference of the rotation part for irregularly reflecting the light emitted from the light emitter.
2. The color wheel apparatus according to claim 1 , wherein the index part is patterned to have a serrated shape that scatters the light emitted from the light emitter.
3. The color wheel apparatus according to claim 1 , wherein the index part is formed at an incline on the rotation part and irregularly reflects the light emitted from the sensor.
4. The color wheel apparatus according to claim 1 , wherein the rotation part comprises:
a filter supporter for supporting the color filter;
a motor body coupled to the filter supporter and rotates integrally with the filter supporter; and
a motor shaft coupled to the color wheel supporter for allowing the motor body to rotate, wherein the index part is formed on an outer circumference of at least one of the motor body and the filter supporter.
5. An optical engine for a digital light processing (DLP) type display device, comprising:
a light source to emit light;
a color wheel apparatus for selectively filtering light emitted from the light source;
a DLP panel for forming an image by adjusting a reflecting angle of the light passed through the color wheel apparatus; and
a projecting lens for projecting the image formed on the DLP panel to a screen, wherein the color wheel apparatus comprises:
a color wheel unit comprising a color filter and a rotation part for supporting the color filter and rotating integrally with the color filter;
a color wheel supporter for rotatably supporting the color wheel unit;
a sensor comprising a light emitter provided in the color wheel supporter for emitting light to the rotation part, and a light receiver to receive the light reflected from the rotation part; and an index part patterned on a predetermined region of a circumference of the rotation part to irregularly reflect the light emitted from the light emitter.
6. The optical engine according to claim 5 , wherein the index part is patterned to have a serrated shape that scatters the light emitted from the sensor.
7. The optical engine according to claim 5 , wherein the index part is formed at an incline on the rotation part to irregularly reflect the light emitted from the sensor.
8. The optical engine according to claim 5 , wherein the rotation part comprises a filter supporter for supporting the color filter; a motor body coupled to the filter supporter for rotating integrally with the filter supporter; and a motor shaft coupled to the color wheel supporter thereby allowing the motor body to rotate, and
wherein the index part is formed on an outer circumference of at least one of the motor body and the filter supporter.