Abstract:
A projection device capable of effectively performing the light utilization is disclosed, particularly comprising polarized beam components and reflective components regarded for controlling polarizing of light, reducing light missing during light transferring from a light source to a projection lens set, increase light utilization efficiency, wherein the polarizing beam components are regarded for separating the light into two orthogonal polarization waves; the present invention further comprises two modulated diaphragms regarded for controlling the strength of said two orthogonal polarization waves, equaling brightness of the polarization waves at final vision, keeping a good quality in final vision.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a projection device capable of effectively performing the light utilization, and more particularly to utilize polarized beam components and reflective components to control the light polarization such that the dissipation and attenuation of light can be further reduced during the transmission process to enhance the utilization efficiency of light. 
     2. Description of the Related Art 
     A light emitting diode (LED) is a semiconductor component. Since LEDs have advantages of high efficiency and long service life, currently the LEDs are widely applied in many different fields. For example, the LED can be applied to a projection display device to provide a light source required for projection. 
     With respect to a conventional projection display device, to reduce etendue effect and effectively utilize the light source, a polarization conversion system (PCS) is disposed inside the conventional projection display device. The PCS is also called beam splitting component that is divided into a reflective PCS and absorption PCS for converting beam polarization direction into S-wave or P-wave so as to increase the light utilization. 
     With reference to  FIG. 1  for a schematic diagram of a light source device of conventional projection equipment is depicted. As shown in  FIG. 1 , the light source device  1 ′ divides a non-polarized beam emitted by a light source emitter E′ into two polarized beams L 1 ′, L 2 ′ that are perpendicular to each other. The light source device  1 ′ includes a polarized beam splitting component  11 ′, two reflective micro-displays  12 ′,  13 ′, an illumination lens set  14 ′ and a projection lens set  15 ′. When the light source emitter E′ emits the non-polarized beam L′, the non-polarized beam L′ is concentrated by the illumination lens set  14 ′ to reach the polarized beam splitting component  11 ′. At this time, the non-polarized beam L′ is divided by the polarized beam splitting component  11 ′ into two polarized beams L 1 ′, L 2 ′ that are perpendicular to each other. Next, the two polarized beams L 1 ′, L 2 ′ are respectively projected to the two reflective micro-displays  12 ′,  13 ′ and reflected through the polarity of the two reflective micro-displays  12 ′,  13 ′, wherein the polarized beam L 1 ′ directly passes through the polarized beam splitting component  11 ′ to reach the projection lens set  15 ′. The polarized beam L 2 ′ is reflected to the projection lens set  15 ′ through the polarized beam splitting component  11 ′. Finally, the two polarized beams are projected to form images via the projection lens set  15 ′. 
     With the foregoing depiction, the structural design of the light source device  1 ′ is quiet simple, and the light source device  1 ′ has the following advantages:
     1. The light source device  1 ′ utilizes the polarized beam splitting component  11 ′ to polarize and convert the beam polarization direction so as to increase the light utilization.   2. In addition, the non-polarized beam L′ is divided into the two polarized beams L 1 ′, L 2 ′ that are perpendicular to each other and transmitted via two different paths and outputted to the projection lens set  15 ′ for projecting and imaging. Such the foregoing manner does not only control the beam strengths of two paths, but also control the polarization state of beams at two paths simultaneously. By incorporating a liquid crystal shutter glasses, a stereoscopic effect can be achieved for visual perception of a viewer.   

     The foregoing technique still has the following shortcomings although the light source device  1 ′ has many advantages.
     (A) Low light utilization: to reduce etenude effect and effectively use the light source, the conventional projection display device is realized by the beam splitting components. However, in actual operating, the beam is not really and completely polarized after passing through the beam splitting components. Consequently, the light utilization is absolutely low. Further, no additional room for disposing a beam polarized purification component between the beam splitting component and the reflective micro-displays of the conventional projection display can offset the beam that is not completely polarized yet. Although there are additional rooms to dispose beam polarized purification component, its optical property is also influenced by incident angles. Thus the uniformity of the illumination is affected well; and   (B) The brightness of polarized beams at different paths is unable to be controlled. As shown in  FIG. 1 , the beam is divided into the polarized beams L 1 ′, L 2 ′ at different paths after entering the polarized beam splitting component. The two polarized beams may have difference on strength due to quality of the beam splitting components and the lens sets. The expression of final stereoscopic imaging may be influenced as well.   

     Therefore, for a light source device of conventional projection equipment, the foregoing shortcomings must be overcome to effectively perform the light utilization, and the beam strength at different paths can also be regulated. 
     SUMMARY OF THE INVENTION 
     In view of the shortcomings of the prior art, the inventor(s) of the present invention based on years of experience in the related industry to conduct extensive researches and experiments, and finally developed a projection device capable of effectively performing the light utilization as a first objective to improve the conventional light utilization. A projection device is disposed by utilizing character of polarized beam components such that the light utilization can be effectively performed to further save energy resource. 
     According to a second objective of the invention, a projection device capable of effectively performing the light utilization is provided to regulate the strength of different beam paths upon demands. By controlling a modulated diaphragm set, the beam strength with different paths can be regulated such that the beam strength can be balanced during the imaging, and excellent imaging quality of images can be remained. 
     To achieve the first objective and the second objective of the invention, the projection device capable of effectively performing the light utilization according to the invention is disposed between a light source and a projection lens set and includes a first polarized beam component capable of receiving a non-polarized beam provided by the light source; a first reflecting mirror correspondingly disposed with the first polarized beam component; a second reflecting mirror correspondingly disposed with the first polarized beam component, and the second reflecting mirror diagonally disposed with the first reflecting mirror; a second polarized beam component diagonally disposed with the first polarized beam component; a third polarized beam component disposed to one side of the second polarized beam component, and the third polarized beam component correspondingly disposed with the first reflecting mirror; a fourth polarized beam component disposed to one side of the second polarized beam component, and the fourth polarized beam component correspondingly disposed with the second reflecting mirror, and the fourth polarized beam component diagonally disposed with the third polarized beam component; at least two reflective components comprising a first reflective component and a second reflective component, wherein the first reflective component is opposite to the first reflecting mirror, and disposed to one side of the third polarized beam component; and the second reflective component is opposite to the second polarized beam component, and disposed to one side of the fourth polarized beam component; at least two modulated diaphragm sets comprising a first modulated diaphragm set and a second modulated diaphragm set, wherein the first modulated diaphragm set is disposed between the first reflecting mirror and the third polarized beam component, and the second modulated diaphragm set is disposed between the second reflecting mirror and the fourth polarized beam component. 
     When the non-polarized beam is irradiated to the first polarized beam component, the non-polarized beam is divided into a first polarized beam and a second polarized beam that are perpendicular to each other, so that, the first polarized beam is remained with an original beam path direction and irradiated to the first reflecting mirror, and the second polarized beam is reflected by the first polarized beam component and irradiated to the second reflecting mirror along a direction that is perpendicular to the original beam path direction. 
     The first polarized beam irradiated to the first reflecting mirror is reflected by the first reflecting mirror and irradiated to the third polarized beam component through the first modulated diaphragm set, and the second polarized beam irradiated to the second reflecting mirror is reflected by the second reflecting mirror and irradiated to the fourth polarized beam component through the second modulated diaphragm set. 
     The first polarized beam irradiated to the third polarized beam component directly passes through the third polarized beam component and is irradiated to the first reflective component, thus, the first reflective component changes a polarity of the first polarized beam and reflects the first polarized beam back to the third polarized beam component, such that, the first polarized beam is reflected by the third polarized beam component and irradiated to the second polarized beam component. 
     The second polarized beam irradiated to the fourth polarized beam component is reflected by the fourth polarized beam component and irradiated to the second reflective component, thus, the second reflective component changes a polarity of the second polarized beam and reflects the second polarized beam back to the fourth polarized beam component, such that, the second polarized beam directly passes through the fourth polarized beam component and is irradiated to the second polarized beam component. 
     The first polarized beam irradiated to the second polarized beam component is reflected by the second polarized beam component, and the second polarized beam irradiated to the second polarized beam component directly passes through the second polarized beam component, so that, the first polarized beam and the second polarized beam are converged together and irradiated to the projection lens set, then an image is able to be displayed by the projection lens set. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a light source of conventional projection equipment; 
         FIG. 2  is a projection device capable of effectively performing the light utilization according to a first embodiment of the invention; 
         FIG. 3  is a projection device capable of effectively performing the light utilization according to a second embodiment of the invention; 
         FIG. 4A  is a result that uses ZEMAX to simulate a size opened or closed by different modulated diaphragm sets of the projection device capable of effectively performing the light utilization according to the invention; 
         FIG. 4B  is a result that uses ASAP to simulate a size opened or closed by different modulated diaphragm sets of the projection device capable of effectively performing the light utilization according to the invention; and 
         FIG. 5  is a projection device capable of effectively performing the light utilization according to a third embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The foregoing and other technical characteristics of the present invention will become apparent with the detailed description of the preferred embodiments and the illustration of the related drawings. 
     First Embodiment 
     First of all, basic components according to a first embodiment of the invention are introduced. With reference to  FIG. 2  for a projection device capable of effectively performing the light utilization according to a first embodiment of the invention is depicted. The projection device capable of effectively performing the light utilization is disposed between a light source  2  and a projection lens set  3 , and realized by four polarized beam component, wherein the projection device includes a first polarized beam component  111  for receiving a non-polarized beam provided by the light source  2  and dividing the non-polarized beam into a first polarized beam T 1  and a second polarized beam U 1 ; a first reflecting mirror  141  correspondingly disposed with the first polarized beam component  111 ; a second reflecting mirror  142  correspondingly disposed with the first polarized beam component  111 , and the second reflecting mirror  142  diagonally disposed with the first reflecting mirror  141 ; a second polarized beam component  112  diagonally disposed with the first polarized beam component  111 ; a third polarized beam component  113  disposed to one side of the second polarized beam component  112 , and the third polarized beam component  113  correspondingly disposed with the first reflecting mirror  141 ; a fourth polarized beam component  114  disposed to one side of the second polarized beam component  112 , and the fourth polarized beam component  114  correspondingly disposed with the second reflecting mirror  142 , and the fourth polarized beam component  114  diagonally disposed with the third polarized beam component  113 . 
     In addition, to accomplish the first embodiment of the invention, the projection device further have two reflective components comprising a first reflective component  121  and a second reflective component  122 , wherein the first reflective component  121  is opposite to the first reflecting mirror  141 , and disposed to one side of the third polarized beam component  113 ; and the second reflective component  122  is opposite to the second polarized beam component  112 , and disposed to one side of the fourth polarized beam component  114 ; and at least two modulated diaphragm sets comprising a first modulated diaphragm set  131  and a second modulated diaphragm set  132 , wherein the first modulated diaphragm set  131  is disposed between the first reflecting mirror  141  and the third polarized beam component  113 , and the second modulated diaphragm set  132  is disposed between the second reflecting mirror  142  and the fourth polarized beam component  114 . 
     The first embodiment of the invention further has seven sets of lens sets capable of reducing the dissipation of polarized light during the projecting process. The lens sets include a first lens set  151  disposed between the first polarized beam component  111  and the light source  2 ; a second lens set  152  disposed between the first polarized beam component  111  and the first reflecting mirror  141 ; a third lens set  153  disposed between the first polarized beam component  111  and the second reflecting mirror  142 ; a fourth lens set  154  disposed between the first reflecting mirror  141  and the third polarized beam component  113 ; a fifth lens set  155  disposed between the second reflecting mirror  142  and the fourth polarized beam component  114 ; a sixth lens set  156  disposed between the third polarized beam component  113  and the first reflective component  121 ; and a seventh lens set  157  disposed between the fourth polarized beam component  114  and the second reflective component  122 . 
     In the present invention, the first polarized beam component  111 , the second polarized beam component  112 , the third polarized beam component  113 , and the fourth polarized beam component  114  are a polarizing beam splitter (PBS) that utilizes surface coating technique such that two kinds of polarized light respectively generate two different optical behaviors having transmittance or reflection while passing through components. The first reflective component  121  and the second reflective component  122  are reflective liquid crystal micro-displays having liquid crystal on silicon. The modulated diaphragm sets are able to adjust luminous flux of the first polarized beam T 1  and the second polarized beam U 1 . 
     The process of projecting polarized beam in the first embodiment of the invention is introduced as the following. With reference to  FIG. 2 , firstly, the illumination beam path according to the first embodiment of the invention is introduced. When the non-polarized beam is irradiated to the first polarized beam component  111 , the non-polarized beam is divided into a first polarized beam T 1  and a second polarized beam U 1  that are perpendicular to each other, then, the first polarized beam T 1  is remained with an original beam path direction and irradiated to the first reflecting mirror  141 , and the second polarized beam U 1  is reflected by the first polarized beam component  111  and irradiated to the second reflecting mirror  142  along a direction that is perpendicular to the original beam path direction. 
     Next, the first polarized beam T 1  irradiated to the first reflecting mirror  141  is reflected by the first reflecting mirror  141  and irradiated to the third polarized beam component  113  through the first modulated diaphragm set  131 , and the second polarized beam U 1  irradiated to the second reflecting mirror  142  is reflected by the second reflecting mirror  142  and irradiated to the fourth polarized beam component  114  through the second modulated diaphragm set  132 . 
     The first polarized beam T 1  irradiated to the third polarized beam component  113  directly passes through the third polarized beam component  113  and is irradiated to the first reflective component  121 , thus, the first reflective component  121  changes a polarity of the first polarized beam T 1  and reflects the first polarized beam T 1  back to the third polarized beam component  113 , such that, the first polarized beam T 1  is reflected by the third polarized beam component  113  and irradiated to the second polarized beam component  112 . 
     The second polarized beam U 1  irradiated to the fourth polarized beam component  114  is reflected by the fourth polarized beam component  114  and irradiated to the second reflective component  122 , thus, the second reflective component  122  changes a polarity of the second polarized beam U 1  and reflects the second polarized beam U 1  back to the fourth polarized beam component  114 , such that, the second polarized beam U 1  directly passes through the fourth polarized beam component  114  and is irradiated to the second polarized beam component  112 . 
     Afterward the projection beam path according to the first embodiment of the invention is introduced, the first polarized beam T 1  irradiated to the second polarized beam component  112  is reflected by the second polarized beam component  112 , and the second polarized beam U 1  irradiated to the second polarized beam component  112  directly passes through the second polarized beam component  112 , so that, the first polarized beam T 1  and the second polarized beam U 1  are converged together and irradiated to the projection lens set  3 , then an image is able to be displayed by the projection lens set  3 . 
     Second Embodiment 
     Referring to  FIG. 3 , there is illustrated a projection device capable of effectively performing the light utilization according to a second embodiment of the invention. The projection device capable of effectively performing the light utilization according to a second embodiment of the invention is disposed between a light source  2  and a projection lens set  3 , wherein the projection device includes a first polarized beam component  111  capable of receiving non-polarized light provided by the light source  2  and the non-polarized light into a first polarized light T 2  and a second polarized light U 2 ; a second polarized beam component  112  correspondingly disposed with the first polarized beam component  111 ; and a third polarized beam component  113  correspondingly disposed with the first polarized beam component  111 . At the same time, the third polarized beam component  113  is also diagonally disposed with the second polarized beam component  112 . Further, the device also has a fourth polarized beam component  114  correspondingly disposed with the second polarized beam component  112  and the third polarized beam component  113  at the same time. 
     In addition, to accomplish the second embodiment of the invention, the projection device further have two reflective components having a first reflective component  121  and a second reflective component  122 , wherein the first reflective component  121  is disposed to one side of the second polarized beam component  112 , and the second reflective component  122  is disposed to one side of the third polarized beam component  113 . Two modulated diaphragm sets included a first modulated diaphragm set  131  and a second modulated diaphragm set  132  are provided, wherein the first modulated diaphragm set  131  is disposed between the first polarized beam component  111  and the second polarized component  112 . The second modulated diaphragm set  132  is disposed between the first polarized beam component  111  and the third polarized beam component  113 . An incident lens  115  is disposed to a side of the first polarized beam component  111 . 
     The second embodiment of the invention further has four sets of lens sets capable of reducing the dissipation of polarized light during the projecting process. The lens sets include an eighth lens set  161  disposed between the first polarized beam component  111  and the second polarized beam component  112 ; a ninth lens set  162  disposed between the first polarized beam component  111  and the third polarized beam component  113 ; a tenth lens set  163  disposed between the second polarized beam component  112  and the fourth polarized beam component  114 ; and an eleventh lens set  164  disposed between the third polarized beam component  113  and the fourth polarized beam component  114 . 
     The process of projecting polarized beam in the second embodiment of the invention is introduced as the following. With reference to  FIG. 3 , firstly, the illumination beam path according to the first embodiment of the invention is introduced. After the non-polarized beam is illuminated the first polarized beam component  111 , the non-polarized beam is divided into a first polarized beam T 2  and a second polarized beam U 2  that are perpendicular to each other. The first polarized beam T 2  is S polarized beam. The second polarized beam U 2  is P polarized beam. At this time, the first polarized beam T 2  is remained with beam path direction and irradiated to the second polarized beam component  112  through the first modulated diaphragm set  131  and the eighth lens set  161 . Simultaneously, the second polarized beam U 2  is irradiated to the third polarized beam component  113  along a direction that is perpendicular to the original beam path direction through the second modulated diaphragm set  132  and the ninth lens set  162 . 
     Next, the polarization conversion process of the polarized light according to the second embodiment of the invention is introduced, wherein the first polarized beam T 2  irradiated to the second polarized beam component  112  directly passes through the second polarized beam component  112  and is able to be irradiated to the first reflective component  121 . Thus, the first reflective component  121  changes the polarity of the first polarized beam T 2  to become P polarized beam, and the first polarized beam T 2  can be reflected to the second polarized beam component  112 . The second polarized beam component  112  instantly reflects the first polarized beam T 2  such that it can be irradiated to the fourth polarized beam component  114  through the tenth lens set  163 . 
     The second polarized beam U 2  irradiated to the third polarized beam component  113  is reflected by the third polarized beam component  113  and irradiated to the second reflective component  122 . At this time, the second reflective component  122  instantly reflects the second polarized beam U 2  and changes its polarity to become S polarized beam such that the second polarized beam U 2  passes through the third polarized beam component  113  to be further irradiated to the fourth polarized beam component  114  through the eleventh lens set  164 . 
     Afterward the projection beam path according to the second embodiment of the invention is introduced, wherein the first polarized beam T 2  irradiated to the fourth polarized beam component  114  is reflected by the fourth polarized beam component  114 . The second polarized beam U 2  irradiated to the fourth polarized beam component  114  directly passes through the fourth polarized beam component  114 . Finally, the first polarized beam T 2  and the second polarized beam U 2  are converged together and irradiated to the projection lens set  3 , then an image displayed by the projection lens set  3 . 
     With reference to  FIG. 4A  and  FIG. 4B  for a result that uses ZEMAX and ASAP to simulate a size opened or closed by different modulated diaphragm sets of the projection device capable of effectively performing the light utilization according to the invention are depicted, wherein ZEMAX and ASAP are optical design software. The ZEMAX shows uniformity and central brightness ratio of beam regarding the modulated diaphragm set under different opening and closing sizes. The ASAP shows the uniformity and central brightness ratio of S-wave and P-wave under different opening and closing sizes regarding the modulated diaphragm sets. The difference between spatial uniformity of beams is remained within 11%. 
     Third Embodiment 
     To further effectively perform the light utilization, the invention can also utilize a beam polarized purification component such that the polarity of the polarized beam can be completely converted to enhance the light utilization. With reference to  FIG. 5  for a projection device capable of effectively performing the light utilization according to a third embodiment of the invention is depicted. In the third embodiment, the main component and its installation are the same as the second embodiment. To prevent the polarized beam from being not-converted by the first polarized beam component  111  completely, two purification components are increased and include a first purification component  151  and a second purification component  152 . The purification component is a polarized clean-up polarization plate, wherein the first purification component  151  is disposed between the first polarized beam component  111  and the second polarized beam component  112 , and the second purification component  152  is disposed between the first polarized beam component  111  and the third polarized beam component  113 . 
     In the third embodiment, the polarity conversion process and projection path of polarized beams are the same as the second embodiment. Only illumination path in the second embodiment further passes through the first purification component  151  and the second purification component  152 . The following depiction is introduced with the illumination path of polarized beam according to the third embodiment of the invention. 
     When the non-polarized beam is irradiated to the first polarized beam component  111 , the non-polarized beam is divided into a first polarized beam T 3  and a second polarized beam U 3 . At this time, the first polarized beam T 3  is remained with original beam path direction and concentrated at the second polarized beam component  112  through the first modulated diaphragm set  131  and the first purification component  151 . Simultaneously, the second polarized beam U 3  is concentrated at the third polarized beam component  113  along a direction that is vertical the original beam path and through the second modulated diaphragm set  132  and the second purification component  152 . 
     In the illumination path of the second embodiment, after the first polarized beam T 3  passes through the first purification component  151 , it can be completely converted into S-wave. After the second polarized beam U 3  passes through the second purification component  152 , it can be completely converted into P-wave. Accordingly, the projection device capable of effectively performing the light utilization according to the invention can effectively perform the light utilization and enhance the efficiency of light utilization. 
     The foregoing depiction is clearly introduced with a projection device capable of effectively performing the light utilization according to the invention. By comparing with a conventional light source device of projection equipment, the projection device capable of effectively performing the light utilization according to the invention has the following advantages:
     1. High light utilization efficiency: the projection device capable of effectively performing the light utilization of the invention enables a beam passing through at least three polarized beam components to completely convert it into S-wave or P-wave and utilizes the reflective components to control the polarization. The dispersing and attenuation of light can be reduced during the transmission process so as to increase the light utilization; and   2. Handle the brightness of different polarized beams: after the beam passes through the polarized beam components, the beam is divided into polarized beams with different paths. The invention is respectively disposed with a modulated diaphragm. The brightness of polarized beams is controlled by the modulated diaphragm to avoid the different brightness between two different path-polarized beams so as to prevent worse imaging quality.   

     The invention improves over the prior art and complies with patent application requirements, and thus is duly filed for patent application. While the invention has been described by device of specific embodiments, numerous modifications and variations could be made thereto by those generally skilled in the art without departing from the scope and spirit of the invention set forth in the claims.