Light source device and projection display system thereof

Abstract

A light source device and a projection display system are provided. The light source device includes a first light source configured to emit first light, a wavelength conversion unit having at least one region, a second light source configured to emit second light, and a light combining element. The at least one region is configured to receive the first light and be excited to generate excited light. The light combining element is configured to converge excited light emitted from the wavelength conversion device and the second light.

What is claimed is: 
     
         1 . A light source device, comprising:
 a first light source configured to emit first light;   a wavelength conversion unit having at least one region, wherein the at least one region is configured to receive the first light and be excited to generate excited light;   a second light source configured to emit second light;   a light combining element, wherein the light combining element is configured to converge excited light emitted from the wavelength conversion device and the second light.   
     
     
         2 . The light source device according to  claim 1 , wherein the wavelength conversion unit has two regions, wherein the two regions comprise a first region and a second region, the first region is configured to scatter the first light and then emit it, and the second region is configured to receive the first light and be excited to generate excited light, wherein the first region and the second region emit the first light and the excited light in a time-sequence manner. 
     
     
         3 . The light source device according to  claim 1 , wherein a wavelength range of the second light is within a wavelength range of the excited light. 
     
     
         4 . The light source device according to  claim 2 , wherein further comprising a light splitting-combining assembly configured to guide the first light, the excited light and the second light, so as to cause the first light to be incident on the at least two regions of the wavelength conversion unit in a time-sequence manner and cause the first light and the excited light which are emitted from the wavelength conversion unit and the second light to be converged. 
     
     
         5 . The light source device according to  claim 1 , wherein the excited light comprises light having a same color as the second light and light having a different color from the second light. 
     
     
         6 . The light source device according to  claim 1 , wherein the light splitting-combining assembly comprises a light splitting element, a light guiding element and a light combining element;
 the light splitting element is disposed on an emission optical path of the first light and is configured to transmit the first light and reflecting light emitted from the first side of the wavelength conversion unit;   the light guiding element is configured to guide the light, that is emitted from the light splitting element after being reflected, to the light combining element;   the light combining element is configured to converge light guided-in by the light guiding element and light emitted from the second side of the wavelength conversion unit into one beam of light and then emit it in a same direction.   
     
     
         7 . The light source device according to  claim 6 , wherein the light guiding element comprises a reflecting element, the reflecting element comprises a transmitting region and a reflecting region, configured to combine, in etendue, the light emitted from the first side of the wavelength conversion unit with the second light. 
     
     
         8 . The light source device according to  claim 1 , wherein an excitation amount of the excited light can be controlled by adjusting a driving current of the first light source. 
     
     
         9 . The light source device according to  claim 1 , wherein the wavelength conversion unit has at least one reflective region. 
     
     
         10 . The light source device according to  claim 1 , wherein the at least one region is provided with yellow fluorescent material. 
     
     
         11 . The light source device according to  claim 1 , further comprising a control unit, and the control unit is configured to control the first light source and the second light source to be turned on or turned off in a time-sequence manner. 
     
     
         12 . The light source device according to  claim 6 , wherein the wavelength conversion unit is configured to emit scattered first light to the light combining element and emit the excited light to the light splitting element or the light combining element. 
     
     
         13 . The light source device according to  claim 6 , wherein the light guiding element comprises a first reflecting element and a second reflecting element, the first light is transmitted from the light splitting element to be incident on the wavelength conversion unit, and the second light is transmitted from the second reflecting element into the light combining element;
 the first reflecting element is disposed on an optical path of at least a portion of excited light emitted by the light splitting element, and is configured to reflect at least the portion of the excited light into the second reflecting element.   
     
     
         14 . The light source device according to  claim 13 , wherein the second reflecting element comprises a third transmitting region and a second reflecting region, the third transmitting region is configured to transmit the second light into the light combining element, and the second reflecting region is configured to reflect at least a portion of excited light, that is reflected from the first reflecting element, to the light combining element. 
     
     
         15 . The light source device according to  claim 11 , wherein during one rotation cycle of the wavelength conversion unit, the control unit is configured to control the first light source to be maintained in a turned-on state in one cycle, and control the second light source to be in a turned-on state only during a period corresponding to a portion of the second region of the wavelength conversion unit. 
     
     
         16 . The light source device according to  claim 11 , wherein further comprising two regions, the two regions are provided with two different color fluorescent materials;
 during one rotation cycle of the wavelength conversion unit, the control unit is configured to control the first light source to be maintained in a turned-on state in part of one cycle, and the control unit is configured to control the second light source to be in a turned-on state during a period corresponding to one of the two regions.   
     
     
         17 . The light source device according to  claim 1 , further comprising a light filter unit, and the light filter unit is disposed in a direction of an emission light of the light combining element, and is configured to filter and emit the converged light. 
     
     
         18 . A projection display system, comprising a light source device, wherein the light source device, comprising:
 a first light source configured to emit first light;   a wavelength conversion unit having at least one region, wherein the at least one region is configured to receive the first light and be excited to generate excited light;   a second light source configured to emit second light;   a light combining element, wherein the light combining element is configured to converge excited light emitted from the wavelength conversion device and the second light.   
     
     
         19 . The projection display system according to  claim 18 , wherein an excitation amount of the excited light can be controlled by adjusting a driving current of the first light source. 
     
     
         20 . The projection display system according to  claim 18 , further comprising a control unit, and the control unit is configured to control the first light source and the second light source to be turned on or turned off in a time-sequence manner.