2-Channel display system comprising micro electro mechanical systems
First Claim
Patent Images
1. A 2-channel display system comprising two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system;
- unpolarized light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space;
a polarization split system PBS1 with a plane of incidence P1POI or polarization conversion systems simultaneously generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, the polarization combining system being spatially separated from the polarization split system;
means for folding the light paths in both channels, at least 1 in each channel, additional to the reflection of the MEMS, and additional to the folding in said PBSs, with planes of incidence T1POI in one channel and T2POI in the second channel, positioned between polarization split system or polarization conversion systems and polarization combining system;
said means for folding coupled to said polarization combining system such that the difference of the absolute values of the cutting angle γ
1 between T1POI and P2POI and the absolute value of the cutting angle γ
2 between T2POI and P2POI is 0°
or 90°
(sin (2*(|γ
1−
|γ
2|))=0);
means to control the mirror arrays of the MEMSs in both channels independently from each other;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel or perpendicular in their virtual projection in the superposition image.
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Abstract
The two channel stereo display system with micro electromechanical systems (MEMS, e.g. DMDs from Texas Instruments) simultaneously generates a right and a left image in two discrete modulation channels, which differ by the polarization of their light beams. More specifically, the invention relates to the chirality (handedness) of MEMS and uncovers solutions for some of the geometric problems associated with this handedness in stereoscopic systems. Unpolarized light is split by a first PBS (5) and directed via two TIRs (3,4) onto two MEMSs (1,2) for spatial modulation. In some embodiments, mirror symmetric, compact light paths and complete superposition of the two subimages with a second PBS (6) are realized with two different MEMSs (1) and (2) which are a pair of stereo isomers. Furthermore we uncover solutions with two identical MEMSs.
86 Citations
21 Claims
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1. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
unpolarized light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space;
a polarization split system PBS1 with a plane of incidence P1POI or polarization conversion systems simultaneously generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, the polarization combining system being spatially separated from the polarization split system;
means for folding the light paths in both channels, at least 1 in each channel, additional to the reflection of the MEMS, and additional to the folding in said PBSs, with planes of incidence T1POI in one channel and T2POI in the second channel, positioned between polarization split system or polarization conversion systems and polarization combining system;
said means for folding coupled to said polarization combining system such that the difference of the absolute values of the cutting angle γ
1 between T1POI and P2POI and the absolute value of the cutting angle γ
2 between T2POI and P2POI is 0°
or 90°
(sin (2*(|γ
1−
|γ
2|))=0);
means to control the mirror arrays of the MEMSs in both channels independently from each other;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel or perpendicular in their virtual projection in the superposition image. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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2. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
unpolarized light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space;
a polarization split system PBS1 with a plane of incidence P1POI simultaneously generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, the polarization combining system being spatially separated from the polarization split system;
said planes P1POI and P2POI being parallel;
means for folding the light paths in both channels (at least 1 in each channel, additional to the reflection of the MEMS, and additional to the folding in said PBSs), with planes of incidence T1POI in one channel and T2POI in the second channel, positioned between polarization split system and polarization combining system;
means to control the mirror arrays of the MEMSs in both channels independently from each other;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel in their virtual projection in the superposition image. - View Dependent Claims (18, 19, 20)
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3. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
unpolarized light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space;
a polarization split system PBS1 with a plane of incidence P1POI simultaneously generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, the polarization combining system being spatially separated from the polarization split system;
means for folding the light paths in both channels, at least 1 in each channel, additional to the reflection of the MEMS, and additional to the folding in said PBSs, with planes of incidence T1POI in one channel and T2POI in the second channel, positioned between polarization split system and polarization combining system;
said means for folding coupled to said polarization combining system such that the cutting angle γ
1 between T1POI and P2POI and the cutting angle γ
2 between T2POI and P2POI are γ
2=±
γ
1;
means to control the mirror arrays of the MEMSs in both channels independently from each other;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel in their virtual projection in the superposition image.
-
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4. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
light of at least two light sources, comprising at least 3 spectral components, which are sufficient to span a color space;
polarization conversion systems, generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, the polarization combining system being spatially separated from the polarization conversion systems;
means for folding the light paths in both channels, at least 1 in each channel, additional to the reflection of the MEMS, and additional to the folding in said PBSs, with planes of incidence T1POI in one channel and T2POI in the second channel, positioned between polarization conversion systems and polarization combining system;
said means for folding coupled to said polarization combining system such that the cutting angle γ
1 between T1POI and P2POI and the cutting angle γ
2 between T2POI and P2POI are γ
2=+γ
1;
means to control the mirror arrays of the MEMSs in both channels independently from each other;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel in their virtual projection in the superposition image.
-
-
5. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space, feeding the two channels;
a polarization split system PBS1 with a plane of incidence P1POI, generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, said PBS2 being spatially separated from PBS1;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are perpendicular in their virtual projection in the superposition image. - View Dependent Claims (21)
-
-
6. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
light of at least two light sources, comprising at least 3 spectral components, which are sufficient to span a color space, feeding the two channels;
polarization conversion systems, generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, said PBS2 being spatially separated from the polarization conversion systems;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are perpendicular in their virtual projection in the superposition image.
-
-
7. A 2-channel display system comprising
two spatially separate channels, simultaneously feeding two polarization coded images into a common light path out of which said images may be separated by a polarization decoding system; -
unpolarized light of at least one light source, comprising at least 3 spectral components, which are sufficient to span a color space;
a polarization split system PBS1 with a plane of incidence P1POI or polarization conversion systems simultaneously generating two spatially separated light beams of a different linear polarization feeding the two channels;
SLMs (spatial light modulators) of the MEMS type (Micro Electro Mechanical System), at least one in each channel, characterized by modulating light via the direction of the reflection of the incident light beam;
MEMSs positioned such that the axis of the incident light beam differs from the axis of the modulated “
ON”
-light beam, the modulated “
ON”
beam being reflected normal to the MEMS surface;
said MEMS having a stereo isometric topology with regard to mirror deflection axes and image raster, and both stereo isometric topologies being used;
a polarization combining system PBS2 with a plane of incidence P2POI for superimposing the two spatially modulated “
ON”
light beams of each channel into a common “
ON”
light beam, the polarization combining system being spatially separated from the polarization split system;
means to control the mirror arrays of the MEMSs in both channels independently from each other;
MEMSs rotated so that the mirror deflection axes of the MEMSs of the two channels are parallel or perpendicular in their virtual projection in the superposition image.
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Specification
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Current AssigneeBernhard Rudolf Bausenwein, Max Mayer
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Original AssigneeBernhard Rudolf Bausenwein, Max Mayer
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InventorsMayer, Max, Bausenwein, Bernhard Rudolf
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current359/291
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CPC Class CodesG02B 26/0833 the reflecting element bein...G02B 27/1066 for enhancing image perform...G02B 27/144 using partially transparent...G02B 27/145 having sequential partially...G02B 27/283 used for beam splitting or ...G02B 30/25 using polarisation techniquesH04N 13/337 using polarisation multiple...H04N 13/363 using image projection scre...H04N 13/365 using digital micromirror d...
