Optical device having a wide field-of-view for multicolor images
First Claim
1. A diffractive optical element for guiding a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, λ
-
B, and shorter than a longest wavelength λ
R, the light striking the diffractive optical element at an angle greater than a first field-of-view angle, α
−
FOV, and smaller than a second field-of-view angle, α
+FOV, the diffractive optical element comprising a linear grating being formed in a light-transmissive substrate, wherein;
(a) said linear grating is characterized by a pitch, d, selected so as to allow total internal reflection of a light having wavelength of λ
B and a striking angle of α
−
FOV; and
(b) said light-transmissive substrate is characterized by an index of refraction, ns, larger than a minimal index of refraction, nMIN, said minimal index of refraction is selected so as to allow total internal reflection of a light having wavelength of λ
R and a striking angle of α
+FOV.
2 Assignments
0 Petitions
Accused Products
Abstract
A diffractive optical element for guiding a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, λB, and shorter than a longest wavelength, λR, the light striking the diffractive optical element at an angle greater than a first field-of-view angle, α−FOV, and smaller than a second field-of-view angle, α+FOV. The diffractive optical element comprising a linear grating being formed in a light-transmissive substrate. The linear grating is characterized by a pitch, d, selected so as to allow total internal reflection of a light having wavelength of λB and a striking angle of α−FOV. The light-transmissive substrate is characterized by an index of refraction, ns, larger than a minimal index of refraction, nMIN, which is selected so as to allow total internal reflection of a light having wavelength of λR and a striking angle of α+FOV.
113 Citations
112 Claims
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1. A diffractive optical element for guiding a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, λ
-
B, and shorter than a longest wavelength λ
R, the light striking the diffractive optical element at an angle greater than a first field-of-view angle, α
−
FOV, and smaller than a second field-of-view angle, α
+FOV, the diffractive optical element comprising a linear grating being formed in a light-transmissive substrate, wherein;
(a) said linear grating is characterized by a pitch, d, selected so as to allow total internal reflection of a light having wavelength of λ
B and a striking angle of α
−
FOV; and
(b) said light-transmissive substrate is characterized by an index of refraction, ns, larger than a minimal index of refraction, nMIN, said minimal index of refraction is selected so as to allow total internal reflection of a light having wavelength of λ
R and a striking angle of α
+FOV. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
-
B, and shorter than a longest wavelength λ
-
23. An optical device for transmitting a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, λ
-
B, and shorter than a longest wavelength λ
R, the light striking the optical device at an angle greater than a first field-of-view angle, α
−
FOV, and smaller than a second field-of-view angle, α
+FOV, the optical device comprising a first diffractive optical element being formed in a light-transmissive substrate, and a second diffractive optical element, laterally displaced from said first diffractive optical element, and being formed in said light-transmissive substrate, wherein;
(a) said first and said second diffractive optical elements are linear gratings characterized by a pitch, d, selected so as to allow total internal reflection of a light having wavelength of λ
B and a striking angle of α
−
FOV; and
(b) said light-transmissive substrate is characterized by an index of refraction, ns, larger than a minimal index of refraction, nMIN, said minimal index of refraction is selected so as to allow total internal reflection of a light having wavelength of λ
R and a striking angle of α
+FOV. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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B, and shorter than a longest wavelength λ
-
55. A method of manufacturing a diffractive optical element for guiding a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, λ
-
B, and shorter than a longest wavelength λ
R, the light striking the diffractive optical element at an angle greater than a first field-of-view angle, α
−
FOV, and smaller than a second field-of-view angle, α
+FOV, the method comprising;
(a) determining a linear grating pitch, d, so as to allow total internal reflection of a light having wavelength of λ
B and a striking angle of α
−
FOV;
(b) determining a minimal index of refraction, nMIN, so as to allow total internal reflection of a light having wavelength of λ
R and a striking angle of α
+FOV; and
(c) forming a linear grating characterized by said grating pitch, d, in a light-transmissive substrate characterized by an index of refraction, ns, wherein said ns being larger than said nMIN. - View Dependent Claims (56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
-
B, and shorter than a longest wavelength λ
-
79. A method of manufacturing an optical device for transmitting a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, λ
-
B and shorter than a longest wavelength λ
R, the light striking the optical device at an angle greater than a first field-of-view angle, α
−
FOV, and smaller than a second field-of-view angle, α
+FOV, the method comprising;
(a) determining a linear grating pitch, d, so as to allow total internal reflection of a light having wavelength of λ
B and a striking angle of α
−
FOV;
(b) determining a minimal index of refraction, nMIN, so as to allow total internal reflection of a light having wavelength of λ
R and a striking angle of α
+FOV; and
(c) positioning a light-transmissive substrate and forming therein a first diffractive optical element and a second diffractive optical element laterally displaced from said first diffractive optical element;
wherein said first and said second diffractive optical elements are linear gratings characterized by said grating pitch, d, and said light-transmissive substrate is characterized by an index of refraction, ns, which is larger than said nMIN. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
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B and shorter than a longest wavelength λ
Specification