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US 8,708,500 B2Granted
Projection device for effectively performing the light utilization
AssigneeNational Tsing Hua University
InventorsCheng-Huan Chen, Sheng-Hsun Hsieh
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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.
Claims16
A projection device capable of effectively performing the light utilization disposed between a light source 2 and a projection lens set 3, the projection device comprising:
- a first polarized beam component 111 for receiving a non-polarized beam provided by the light source 2;
- 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;
- at least 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;
- wherein 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 T1 and a second polarized beam U1 that are perpendicular to each other, so that, the first polarized beam T1 is remained with an original beam path direction and irradiated to the first reflecting mirror 141, and the second polarized beam U1 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;
- wherein the first polarized beam T1 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 U1 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;
- wherein the first polarized beam T1 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 T1 and reflects the first polarized beam T1 back to the third polarized beam component 113, such that, the first polarized beam T1 is reflected by the third polarized beam component 113 and irradiated to the second polarized beam component 112;
- wherein the second polarized beam U1 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 U1 and reflects the second polarized beam U1 back to the fourth polarized beam component 114, such that, the second polarized beam U1 directly passes through the fourth polarized beam component 114 and is irradiated to the second polarized beam component 112;
- wherein the first polarized beam T1 irradiated to the second polarized beam component 112 is reflected by the second polarized beam component 112, and the second polarized beam U1 irradiated to the second polarized beam component 112 directly passes through the second polarized beam component 112, such that, the first polarized beam T1 and the second polarized beam U1 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.
12 more elements
A projection device capable of effectively performing the light utilization disposed between a light source 2 and a projection lens set 3, the projection device comprising:
- a first polarized beam component 111 for receiving a non-polarized beam provided by the light source 2;
- a second polarized beam component 112 correspondingly disposed with the first polarized beam component 111;
- a third polarized beam component 113 correspondingly disposed with the first polarized beam component 111, the third polarized beam component 113 diagonally disposed with the second polarized beam component 112;
- a fourth polarized beam component 114 correspondingly disposed with the second polarized beam component 112 and the third polarized beam component 113;
- at least two reflective components comprising 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;
- 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 polarized beam component 111 and the second polarized beam component 112, and the second modulated diaphragm set 132 is disposed between the first polarized beam component 111 and the third polarized beam component 113;
- wherein 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 T2 and a second polarized beam U2 that are perpendicular to each other, and the first polarized beam T2 is remained with an original beam path direction and irradiated to the second polarized beam component 112 through the first modulated diaphragm set 131, and the second polarized beam U2 is irradiated to the third polarized beam component 113 along a direction that is perpendicular to the original beam path direction and through the second modulated diaphragm set 132;
- wherein the first polarized beam T2 irradiated to the second polarized beam component 112 directly passes through the second polarized beam component 112 and is irradiated to the first reflective component 121, thus the first reflective component 121 changes a polarity of the first polarized beam T2 and reflects the first polarized beam T2 back to the second polarized beam component 112, such that the second polarized beam component 112 reflects the first polarized beam T2, and the first polarized beam T2 is irradiated to the fourth polarized beam component 114;
- wherein the second polarized beam U2 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, thus the second reflective component 122 reflects the second polarized beam U2 and changes a polarity of the second polarized beam U2, such that the second polarized beam U2 passes through the third polarized beam component 113 to irradiate to the fourth polarized beam component 114;
- wherein the first polarized beam T2 irradiated to the fourth polarized beam component 114 is reflected by the fourth polarized beam component 114, and the second polarized beam U2 irradiated to the fourth polarized beam component 114 directly passes through the fourth polarized beam component 114, so that, the first polarized beam T2 and the second polarized beam U2 are converged together and irradiated to the projection lens set 3, then an image displayed by the projection lens set 3.
8 more elements
Dependencies are inferred from the claim text.