Illumination system and projection apparatus

Abstract

An illumination system includes a green light source, a red light source, a blue light source, a first splitter, a second splitter, and a thermoelectric cooler. The first splitter is disposed downstream of the light sources, the first splitter being capable of reflecting a first color light beam and allowing a second color light beam to pass. The second splitter is disposed at the light paths of the light sources, and the second splitter being capable of reflecting a third color light beam and allowing the first color light beam and the second color light beam to pass, wherein the color of the first color light beam, the second color light beam, and the third color light beam are substantially different. The thermoelectric cooler is thermally coupled to the red light source, and neither the green light source nor the blue light source is thermally couple to any thermoelectric cooler.

What is claimed is: 
     
         1 . An illumination system, comprising:
 a green light source;   a red light source, comprising at least one semi-conductor die;   a blue light source;   a first splitter, disposed downstream of the green light source, the red light source, and the blue light source; the first splitter being capable of reflecting a first color light beam and allowing a second color light beam to pass;   a second splitter, disposed at the light paths of the green light source, the red light source, and the blue light source, the second splitter being capable of reflecting a third color light beam and allowing the first color light beam and the second color light beam to pass, wherein the color of the first color light beam, the second color light beam, and the third color light beam are substantially different; and   a thermoelectric cooler, thermally coupled to the red light source, and neither the green light source nor the blue light source being thermally coupled to any thermoelectric cooler.   
     
     
         2 . The illumination system according to  claim 1 , wherein a specified time period refer to time needed to play a single frame, wherein, within the specified time period, the green light beam is outputted for a time length of at least 45% of the specified time period. 
     
     
         3 . The illumination system according to  claim 1 , wherein the green light beam having a duty of at least 60% or more. 
     
     
         4 . The illumination system according to  claim 1 , wherein the illumination system comprises no more than one thermoelectric cooler. 
     
     
         5 . The illumination system according to  claim 1 , wherein each of the red light source, the green light source, and the blue light source comprises at least one LED die respectively. 
     
     
         6 . The illumination system according to  claim 5 , wherein each of the green light source, the red light source, and the blue light source has a circuit board respectively, the circuit board of the red light source comprises a first side and a second side, the LED die is disposed at the first side of the circuit board, the second side is connected to a cold side of the thermoelectric cooler. 
     
     
         7 . The illumination system according to  claim 6 , further comprising a heat dissipation device thermally coupled to a heat side of the thermoelectric cooler, the green light source has power consumption rate of no less than 48 Watts. 
     
     
         8 . The illumination system according to  claim 1 , wherein the first splitter and the second splitter forms an X-shape structure. 
     
     
         9 . The illumination system according to  claim 1 , wherein the first splitter has one side slantly facing the green light source and the blue light source. 
     
     
         10 . The illumination system according to  claim 9 , wherein the second splitter has one side slantly facing the red light source and another side slantly facing the green light source. 
     
     
         11 . A projection apparatus, comprising:
 a green light source;   a red light source, comprising at least one semi-conductor die;   a blue light source;   a thermoelectric cooler, thermally coupled to the red light source;   a light valve, disposed downstream of the red light source, the blue light source and the green light source;   a projection lens, disposed downstream of the light valve; and   a prism, disposed at a light path between the light valve and the projection lens;   wherein, neither the blue light source nor the green light source is thermally coupled to any thermoelectric cooler.   
     
     
         12 . The projection apparatus according to  claim 11 , wherein the green light beam having a duty of at least 60% or more. 
     
     
         13 . The projection apparatus according to  claim 11 , further comprising:
 a first splitter, disposed downstream of the green light source, the red light source, and the blue light source, the first splitter being capable of reflecting a first color light beam and allowing a second color light beam to pass; and   a second splitter, disposed at the light paths of the green light source, the red light source, and the blue light source, and the second splitter being capable of reflecting a third color light beam and allowing the first color light beam and the second color light beam to pass, wherein the color of the first color light beam, the second color light beam, and the third color light beam are substantially different.   
     
     
         14 . The projection apparatus according to  claim 13 , wherein the first splitter and the second splitter forms an X-shape structure. 
     
     
         15 . The projection apparatus according to  claim 13 , wherein the green light source, the red light source, and the blue light source comprises at least one LED die respectively. 
     
     
         16 . The projection apparatus according to  claim 13 , wherein the first splitter has one side slantly facing the green light source and the blue light source. 
     
     
         17 . The projection apparatus according to  claim 16 , wherein the second splitter has one side slantly facing the red light source and another side slantly facing the green light source. 
     
     
         18 . The projection apparatus according to  claim 13 , further comprising a heat dissipation device thermally coupled to a heat side of the thermoelectric cooler and the green light source has power consumption rate of no less than 48 Watts. 
     
     
         19 . The projection apparatus according to  claim 18 , further comprising a heat fin set, thermally coupled to the thermoelectric cooler. 
     
     
         20 . The projection apparatus according to  claim 11 , wherein the projection apparatus comprises no more than one thermoelectric cooler.