US5528720A — Tapered multilayer luminaire devices

Claim 1

Independent Claim 245 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including a layer having index n 2 less than n 1 disposed beyond said second surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said layer of index n 2 ; and second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means being disposed beyond said second surface relative to said base layer and said second layer means further able to reflect at least part of the light having the second polarization state.

Claim 2

Dependent Claim 245 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including a layer having index n 2 less than n 1 disposed beyond said second surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said layer of index n 2 ; and second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means being disposed beyond said second surface relative to said base layer and said second layer means further able to reflect at least part of the light having the second polarization state.

Claim 3

Dependent Claim 36 words

The optical device as defined in claim 1 wherein at least one of said first and second layer means comprises a light converting means for at least partially changing light of one polarization to another polarization.

Claim 4

Dependent Claim 25 words

The optical device as defined in claim 1 further including light redirecting layer means for changing the angle of light for output to the viewer.

Claim 5

Dependent Claim 23 words

The optical device as defined in claim 3 wherein said light redirecting means further comprises means for controlling angular range of light output.

Claim 6

Dependent Claim 26 words

The optical device as defined in claim 3 further including converting means for at least partially changing light of one polarization to light of another polarization.

Claim 7

Dependent Claim 16 words

The optical device as defined in claim 5 wherein said converting means comprises a birefringent layer.

Claim 8

Dependent Claim 28 words

The optical device as defined in claim 1 further including light converting means for changing light of the second polarization state to light of the first polarization state.

Claim 9

Dependent Claim 28 words

The optical device as defined in claim 7 wherein said second layer means is disposed on the opposite side of said base layer relative to said converting means.

Claim 10

Dependent Claim 56 words

The optical device as defined in claim 7 further including light redirecting means for controlling angular range of light to be output from said device, said second layer means being disposed on the same side of said base layer as said light redirecting means and also closer to said base layer than said light redirecting means.

Claim 11

Dependent Claim 26 words

The optical device as defined in claim 1 further including light redirecting means for controlling angular range of light to be output from said optical device.

Claim 12

Dependent Claim 18 words

The optical device as defined in claim 1 wherein said base layer includes an additional layer coupled thereto.

Claim 13

Dependent Claim 54 words

The optical device as defined in claim 1 further including at least one intervening layer disposed between said base layer and said first layer means, said intervening layer allowing transmission of at least part of the light and said intervening layer wherein said first layer means is comprised of at least an air gap.

Claim 14

Dependent Claim 39 words

The optical device as defined in claim 1 wherein said first layer means is disposed one of (a) further from said second surface than said second layer means and (b) nearer said second surface than said second layer means.

Claim 15

Dependent Claim 28 words

The optical device as defined in claim 1 further including a liquid crystal display disposed adjacent said device with light redirected to said display by said optical device.

Claim 16

Dependent Claim 17 words

The optical device as defined in claim 1 wherein said first layer means includes an air gap.

Claim 17

Dependent Claim 157 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; and layer means coupled to said base layer for preferably outputting light of a first polarization state compared to a second polarization state, said layer means further able to reflect at least part of the light having the second polarization state.

Claim 18

Dependent Claim 157 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; and layer means coupled to said base layer for preferably outputting light of a first polarization state compared to a second polarization state, said layer means further able to reflect at least part of the light having the second polarization state.

Claim 19

Dependent Claim 26 words

The optical device as defined in claim 16 wherein said layer means includes a layer with index of refraction n 2 less than n 1 .

Claim 20

Dependent Claim 19 words

The optical device as defined in claim 17 wherein said layer means is coupled directly to said base layer.

Claim 21

Dependent Claim 16 words

The optical device as defined in claim 17 wherein said layer means includes an air gap.

Claim 22

Dependent Claim 54 words

The optical device as defined in claim 17 wherein said layer means comprises light converting means for at least partially changing light of one polarization to light of another polarization and also includes light redirecting layer means for operating on the light to control the angular output range of the light to the viewer.

Claim 23

Dependent Claim 24 words

The optical device as defined in claim 20 wherein said light converting means and said light redirecting layer means are disposed adjacent one another.

Claim 24

Dependent Claim 17 words

The optical device as defined in claim 20 wherein said light converting means comprises a birefringent layer.

Claim 25

Dependent Claim 28 words

The optical device as defined in claim 22 wherein said birefringent layer is disposed on one side of said base layer compared to said light redirecting layer means.

Claim 26

Dependent Claim 56 words

The optical device as defined in claim 17 wherein said layer means comprises a birefringent layer, converting means for changing light of the second polarization state to light of the first polarization state and light redirecting layer means for operating on the light to exert control over angular output range of the light to the viewer.

Claim 27

Dependent Claim 29 words

The optical device as defined in claim 24 wherein said light redirecting layer means is disposed further from said base layer than said birefringent layer and said converting means.

Claim 28

Dependent Claim 23 words

The optical device as defined in claim 25 wherein said converting means is disposed closer to said base layer than said birefringent layer.

Claim 29

Dependent Claim 50 words

The optical device as defined in claim 17 wherein said layer means further provides light of the first polarization state being transmitted through said first surface of said base layer and part of the light of the second polarization state being transmitted through said second surface of said base layer.

Claim 30

Dependent Claim 254 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap disposed beyond said second surface relative to said base layer and for enabling light to enter said air gap after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said air gap, second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means also disposed beyond said second surface relative to said base layer and said second layer means further enabling reflection of at least part of the light of the second polarization state; and light redirecting means for operating on light having passed through said base layer to enable the light to be output from said device.

Claim 31

Dependent Claim 254 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap disposed beyond said second surface relative to said base layer and for enabling light to enter said air gap after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said air gap, second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means also disposed beyond said second surface relative to said base layer and said second layer means further enabling reflection of at least part of the light of the second polarization state; and light redirecting means for operating on light having passed through said base layer to enable the light to be output from said device.

Claim 32

Dependent Claim 33 words

The optical device as defined in claim 28, wherein said redirecting means includes means for operating on the light having passed through said second layer means to control angular output of the light.

Claim 33

Dependent Claim 28 words

The optical device as defined in claim 29 wherein said light redirecting means operates on said reflected light and redirects the reflected light toward said second layer means.

Claim 34

Dependent Claim 24 words

The optical device as defined in claim 30 wherein said light redirecting means is disposed beyond said top surface relative to said base layer.

Claim 35

Dependent Claim 19 words

The optical device as defined in claim 31 wherein said light redirecting means includes at least a reflecting layer.

Claim 36

Dependent Claim 240 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means comprising an air gap layer disposed at least beyond said first surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between said base layer and said air gap layer; and second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means disposed beyond said second surface relative to said base layer and said second layer means including an air gap and further enabling reflection of at least part of the light having the second polarization state.

Claim 37

Dependent Claim 240 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means comprising an air gap layer disposed at least beyond said first surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between said base layer and said air gap layer; and second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means disposed beyond said second surface relative to said base layer and said second layer means including an air gap and further enabling reflection of at least part of the light having the second polarization state.

Claim 38

Dependent Claim 30 words

The optical device as defined in claim 33 further including a redirecting layer overlying said first layer, said redirecting layer transmitting light toward the viewer over a controlled angular range.

Claim 39

Dependent Claim 43 words

The optical device as defined in claim 33 wherein said second layer means further comprises converting means for changing at least part of the light of the second polarization state to provide light of the first polarization state for output to the viewer.

Claim 40

Dependent Claim 30 words

The optical device as defined in claim 35 wherein said second layer means converts light from the second to the first polarization state with at least a ten percent efficiency.

Claim 41

Dependent Claim 28 words

The optical device as defined in claim 35 wherein said means for changing polarization has an index of refraction n>1.4, thickness>5 μm and is birefringent such that Δn>0.05.

Claim 42

Dependent Claim 26 words

The optical device as defined in claim 37 wherein said birefringent second layer means is selected from the group consisting of polyester, acrylic and polycarbonate materials.

Claim 43

Dependent Claim 65 words

The optical device as defined in claim 33 wherein said second layer means causes less than a ten percent change of angular distribution of the light output to the viewer for light incident at an angle x relative to the surface normal wherein, ##EQU11## where n 1 =index of refraction of said base layer and n 2 =index of refraction of said first layer means.

Claim 44

Dependent Claim 36 words

The optical device as defined in claim 33 further including third layer means disposed between said base layer and the viewer, said third layer means for converting light of one polarization state to another polarization state.

Claim 45

Dependent Claim 37 words

The optical device as defined in claim 40 wherein said third layer means further includes a liquid crystal layer electrically activated for converting the polarization of light passing therethrough from one polarization state to another polarization state.

Claim 46

Dependent Claim 40 words

The optical device as defined in claim 33 further including an air gap layer between said liquid crystal layer and a separate layer portion forming said third layer means, for converting light from the first to the second polarization state.

Claim 47

Dependent Claim 25 words

The optical device as defined in claim 33 wherein said second layer means is transparent to light having both the first and second polarization states.

Claim 48

Dependent Claim 31 words

The optical device as defined in claim 33 wherein said birefringent second layer means comprises at least one of a biaxially oriented layer and a uniaxially oriented layer of birefringent material.

Claim 49

Dependent Claim 26 words

The optical device as defined in claim 33 wherein the light comprises at least one of linearly polarized light, circularly polarized light and elliptically polarized light.

Claim 50

Dependent Claim 190 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap at least one of disposed beyond said first surface and beyond said second surface relative to said base layer and having an optical index of refraction n 2 for allowing transmission of light received from said base layer; and converting layer means for changing light of one polarization state to another polarization state, said converting layer means disposed at least one of overlying and underlying said base layer.

Claim 51

Dependent Claim 190 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap at least one of disposed beyond said first surface and beyond said second surface relative to said base layer and having an optical index of refraction n 2 for allowing transmission of light received from said base layer; and converting layer means for changing light of one polarization state to another polarization state, said converting layer means disposed at least one of overlying and underlying said base layer.

Claim 52

Dependent Claim 35 words

The optical device as defined in claim 46 further including a reflecting layer beyond said second surface relative to said base layer for reflecting light of the second polarization state received from said base layer.

Claim 53

Dependent Claim 41 words

The optical device as defined in claim 47 further including means beyond said reflecting layer relative to said base layer for rotating light of the second polarization state to provide light of the first polarization state for output to the viewer.

Claim 54

Dependent Claim 41 words

The optical device as defined in claim 48 further including third layer means disposed between said first layer and the viewer, said third layer means for converting light of the first polarization state to light having an LCD preferred polarization state.

Claim 55

Dependent Claim 17 words

The optical device as defined in claim 49 wherein said third layer means comprises a birefringent layer.

Claim 56

Dependent Claim 37 words

The optical device as defined in claim 46 further including light redirecting means at least one of overlying and underlying said first layer means, said redirecting means for selectively redirecting light output from said first layer means.

Claim 57

Dependent Claim 23 words

The optical device as defined in claim 46 further including second layer means for preferably transmitting light of one polarization relative to another.

Claim 58

Dependent Claim 265 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap beyond said second surface relative to said base layer and said base layer first surface for enabling light to enter said layer means from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of the interface between the base layer and the layer means; light redirecting means for operating on light having passed through said base layer and for outputting the light toward the viewer; and second layer means disposed in a layer position being a layer beyond said first surface relative to said base layer and being a layer beyond said light redirecting means relative to said base layer, said second layer means for preferably transmitting light of a first polarization state compared to a second polarization state and for preferably reflecting light of the second polarization state.

Claim 59

Dependent Claim 265 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap beyond said second surface relative to said base layer and said base layer first surface for enabling light to enter said layer means from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of the interface between the base layer and the layer means; light redirecting means for operating on light having passed through said base layer and for outputting the light toward the viewer; and second layer means disposed in a layer position being a layer beyond said first surface relative to said base layer and being a layer beyond said light redirecting means relative to said base layer, said second layer means for preferably transmitting light of a first polarization state compared to a second polarization state and for preferably reflecting light of the second polarization state.

Claim 60

Dependent Claim 50 words

The optical device as defined in claim 53 wherein said second layer means is disposed beyond said first surface relative to said base layer and the optical device further includes another light redirecting means disposed beyond both said second layer means and said first surface relative to said base layer.

Claim 61

Dependent Claim 38 words

The optical device as defined in claim 53 wherein said redirecting means comprises at least one of a reflective layer able to reflect light and a transmissive layer able to modify the angular distribution of light passing therethrough.

Claim 62

Dependent Claim 62 words

The optical device as defined in claim 53 wherein said second layer means is disposed beyond a first one of said light redirecting means, relative to said base layer, with an air gap disposed between said base layer and said second layer means and another air gap disposed between said second layer means and a second one of said light redirecting means.

Claim 63

Dependent Claim 288 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap at least one of disposed beyond said first surface relative to said base layer and beyond said bottom layer surface relative to said base layer and having an optical index of refraction n 2 for allowing transmission of light received from said base layer; second layer means for preferably transmitting light of a first polarization state relative to a second polarization state, said second layer means disposed at least one of (a) disposed beyond said first surface and said first layer means relative to said base layer and (b) disposed beyond said second surface and said first layer means and said second layer means further enabling reflection of at least part of the light having the second polarization state; light redirecting means for operating on the light reflected by said second layer means and redirecting it back toward said second layer means; and third layer means for converting at least part of the light of the second polarization state to light of the first polarization state.

Claim 64

Dependent Claim 288 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including an air gap at least one of disposed beyond said first surface relative to said base layer and beyond said bottom layer surface relative to said base layer and having an optical index of refraction n 2 for allowing transmission of light received from said base layer; second layer means for preferably transmitting light of a first polarization state relative to a second polarization state, said second layer means disposed at least one of (a) disposed beyond said first surface and said first layer means relative to said base layer and (b) disposed beyond said second surface and said first layer means and said second layer means further enabling reflection of at least part of the light having the second polarization state; light redirecting means for operating on the light reflected by said second layer means and redirecting it back toward said second layer means; and third layer means for converting at least part of the light of the second polarization state to light of the first polarization state.

Claim 65

Dependent Claim 35 words

The optical device as defined in claim 57 wherein said light redirecting means includes a reflective layer disposed underlying said second surface of said base layer and said second layer means overlying said base layer.

Claim 66

Dependent Claim 24 words

The optical device as defined in claim 58 wherein said third layer means is disposed between said reflective layer and said second layer means.

Claim 67

Dependent Claim 25 words

The optical device as defined in claim 59 wherein said third layer means is disposed above said first surface along with said second layer means.

Claim 68

Dependent Claim 23 words

The optical device as defined in claim 59 said third layer means is disposed below said second surface along with said reflective layer.

Claim 69

Dependent Claim 28 words

The optical device as defined in claim 57 wherein said second layer means comprises a plurality of layers of material having alternating high and low indices of refraction.

Claim 70

Dependent Claim 37 words

The optical device as defined in claim 62 wherein the indices of refraction n H (high index) and n L (low index) meet the requirement: tanθ.sub.H =n.sub.H /n.sub.L ; tanθ.sub.L =n.sub.L /n.sub.H and n.sub.H.sup.2 n.sub.L.sup.2 ≅n.sub.H.sup.2 +n.sub.L.sup.2

Claim 71

Dependent Claim 30 words

The optical device as defined in claim 63 wherein the thickness of each layer of said plurality of layers is about one quarter the wavelength of light in said layers.

Claim 72

Dependent Claim 30 words

The optical device as defined in claim 63 wherein the thickness of each layer of said plurality of layers is at least twice the wavelength of light in said layers.

Claim 73

Dependent Claim 25 words

The optical device as defined in claim 57 wherein said third layer means is disposed between said second layer means and said light redirecting means.

Claim 74

Dependent Claim 250 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; layer means for preferably outputting light of a first polarization state compared to a second polarization state, said layer means including a first filter layer means for filtering the light to pass preferably said light of first polarization state and said layer means further including converting means for changing at least a part of said light of second polarization state to said light of first polarization state; a liquid crystal display layer positioned to receive said light of first polarization state and output said light to the viewer; and light diffuser means for diffusing light output from said layer means and said liquid crystal display layer to broaden the light in a narrow angular distribution in a plane thereby outputting light to a viewer over a range of viewing angle without distorting image quality.

Claim 75

Dependent Claim 250 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; layer means for preferably outputting light of a first polarization state compared to a second polarization state, said layer means including a first filter layer means for filtering the light to pass preferably said light of first polarization state and said layer means further including converting means for changing at least a part of said light of second polarization state to said light of first polarization state; a liquid crystal display layer positioned to receive said light of first polarization state and output said light to the viewer; and light diffuser means for diffusing light output from said layer means and said liquid crystal display layer to broaden the light in a narrow angular distribution in a plane thereby outputting light to a viewer over a range of viewing angle without distorting image quality.

Claim 76

Dependent Claim 27 words

The optical device as defined in claim 67 wherein said layer means comprises at least one polarization filter layer and at least one light polarization converting layer.

Claim 77

Dependent Claim 18 words

The optical device as defined in claim 67 wherein said light diffuser means comprises a parallel light diffuser.

Claim 78

Dependent Claim 23 words

The optical device as defined in claim 67 wherein said light diffuser means comprises a light redirecting layer having a prismatic faceted surface.

Claim 79

Dependent Claim 262 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; and first layer means including a layer having index n 2 less than n 1 disposed beyond said second surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said layer of index n 2 ; and a liquid crystal display layer positioned to receive the light output from said first layer means and output said light to the viewer; and light diffuser means for diffusing light output from said layer means and said liquid crystal display layer to broaden the light in a narrow angular distribution in a plane thereby outputting light to a viewer over a range of viewing angle without distorting image quality.

Claim 80

Dependent Claim 262 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; and first layer means including a layer having index n 2 less than n 1 disposed beyond said second surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said layer of index n 2 ; and a liquid crystal display layer positioned to receive the light output from said first layer means and output said light to the viewer; and light diffuser means for diffusing light output from said layer means and said liquid crystal display layer to broaden the light in a narrow angular distribution in a plane thereby outputting light to a viewer over a range of viewing angle without distorting image quality.

Claim 81

Dependent Claim 36 words

The optical device as defined in claim 71 further including at least one of a reflector layer, a light redirecting layer, and a transverse diffuser disposed nearer said base layer than said liquid crystal display layer.

Claim 82

Dependent Claim 280 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including a layer having index n 2 less than n 1 disposed beyond said second surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said layer of index n 2 ; second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means being disposed beyond said second surface relative to said base layer and said second layer means further able to reflect at least part of the light having the second polarization state; light redirecting means for controlling angular range of light to be output from said device; and a liquid crystal display layer positioned to receive said light of said first polarization state for output to the viewer.

Claim 83

Dependent Claim 280 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second layer surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; first layer means including a layer having index n 2 less than n 1 disposed beyond said second surface relative to said base layer and for enabling light to enter said first layer means after output from said base layer when the light in said base layer achieves the angle of incidence less than the critical angle θ c characteristic of an interface between the base layer and said layer of index n 2 ; second layer means for preferably outputting light of a first polarization state compared to a second polarization state, said second layer means being disposed beyond said second surface relative to said base layer and said second layer means further able to reflect at least part of the light having the second polarization state; light redirecting means for controlling angular range of light to be output from said device; and a liquid crystal display layer positioned to receive said light of said first polarization state for output to the viewer.

Claim 84

Dependent Claim 27 words

The optical device as defined in claim 73 wherein said second layer means comprises at least one of a polarization filter layer and a polarization converter layer.

Claim 85

Dependent Claim 208 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; layer means including an air gap at least one of disposed beyond said first surface and beyond said second surface relative to said base layer and having an optical index of refraction n 2 for allowing transmission of light received from said base layer; converting layer means for changing light of one polarization state to another polarization state, said converting layer means disposed at least one of overlying and underlying said base layer; and a liquid crystal display layer positioned to receive said light of said first polarization for output to the viewer.

Claim 86

Dependent Claim 208 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having a wedge-shaped cross-sectional area and having an optical index of refraction n 1 , and a first and a second surface converging to define at least one angle of inclination φ, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected therein decreases its angle relative to the normal to at least one of said first and second surfaces and achieves an angle of incidence less than a critical angle θ c relative to the normal; layer means including an air gap at least one of disposed beyond said first surface and beyond said second surface relative to said base layer and having an optical index of refraction n 2 for allowing transmission of light received from said base layer; converting layer means for changing light of one polarization state to another polarization state, said converting layer means disposed at least one of overlying and underlying said base layer; and a liquid crystal display layer positioned to receive said light of said first polarization for output to the viewer.

Claim 87

Dependent Claim 37 words

The optical device as defined in claim 75 further including light diffuser means for diffusing light output from said layer means and said liquid crystal display layer to broaden the light in a selected narrow angular distribution.

Claim 88

Dependent Claim 27 words

The optical device as defined in claim 75 wherein said layer means comprises at least one polarization filter layer and at least one light polarization converting layer.

Claim 89

Dependent Claim 40 words

The optical device as defined in claim 75 wherein said light redirecting means comprises at least one of a light redirecting layer disposed above or below said base layer and (2) a light redirecting layer disposed adjacent said back surface.

Claim 90

Dependent Claim 205 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having an optical index of refraction n 1 , and a first surface and a second surface, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected between the first and second surfaces progressively decreases its angle of incidence about 2φ with each cycle of reflection relative to the normal to at least one of said first and second layer surfaces and leaves the base layer upon achieving an angle of incidence less than a critical angle θ c relative to the normal; light redirecting means for controlling angular range of light in said device and to be output to the viewer from said device; and layer means for preferably outputting light of a first polarization state compared to a second polarization state, said layer means including a filter layer means for filtering the light to pass preferably said light of first polarization state and said layer means further including converting means for changing said light of second polarization state to said light of first polarization state.

Claim 91

Dependent Claim 205 words

An optical device for operating on light from a source and for selectively outputting light to a viewer, comprising: a base layer having an optical index of refraction n 1 , and a first surface and a second surface, said base layer further including a back surface spanning said first and second surfaces, and the light exiting said base layer when the light being reflected between the first and second surfaces progressively decreases its angle of incidence about 2φ with each cycle of reflection relative to the normal to at least one of said first and second layer surfaces and leaves the base layer upon achieving an angle of incidence less than a critical angle θ c relative to the normal; light redirecting means for controlling angular range of light in said device and to be output to the viewer from said device; and layer means for preferably outputting light of a first polarization state compared to a second polarization state, said layer means including a filter layer means for filtering the light to pass preferably said light of first polarization state and said layer means further including converting means for changing said light of second polarization state to said light of first polarization state.

Claim 92

Dependent Claim 31 words

The optical device as defined in claim 79 further including a liquid crystal display layer positioned to receive said light of first polarization state and output said light to the viewer.

Claim 93

Dependent Claim 58 words

The optical device as defined in claim 80 further including light diffuser means for diffusing light output from said layer means and said liquid crystal display layer to broaden the light in a narrow angular distribution in at least one selected plane thereby outputting light to a viewer over a range of viewing angle without distorting image quality.

Claim 94

Dependent Claim 45 words

The optical device as defined in claim 79 wherein the range of angle of the output light has a redirected angle of output arising in part from the angle of output from the base layer upon decreasing its angle of incidence below θ c .

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1999-06-18	1999-12-18	2000-06-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2003-06-18	2003-12-18	2004-06-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2007-06-18	2007-12-18	2008-06-18	$7700.00	Window Closed / Lapsed

Tapered multilayer luminaire devices

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