Optic having a cladding
AssigneeMicrosoft Corporation
InventorTimothy Andrew Large
Life of this patent
Estimating the term…
Abstract
Various embodiments of wedge-shaped light guide optics are disclosed. One embodiment comprises a wedge-shaped light guide having opposing first and second faces and includes a material having a first refractive index. The first face of the wedge-shaped light guide supports a cladding layer having a second refractive index less than the first refractive index. The optic further comprises a turning film bonded to the cladding layer via an interface layer. The interface layer has a third refractive index matched to the first refractive index.
Claims20
An optic comprising:
- a wedge-shaped light guide having opposing first and second faces and comprising a material having a first refractive index, the first face supporting a cladding layer having a second refractive index less than the first refractive index;
- and
- a turning film bonded to the cladding layer via an interface layer, the interface layer having a third refractive index matched to the first refractive index.
A touch-sensitive display system configured to detect touch by capturing an image of one or more objects disposed on a touch-sensitive display surface, the system comprising:
- an illuminant configured to illuminate the one or more objects from behind the touch-sensitive display surface with light having a median wavelength λ;
- a detector configured to capture the image;
- an optic configured to direct to the detector light reflected from the one or more objects and to attenuate a reflection of the light, the optic comprising:
- a wedge-shaped light guide having opposing first and second faces and comprising a material having a first refractive index, the first face supporting a cladding layer having a second refractive index less than the first refractive index, a thickness d of the cladding layer given by
- d
- ≈
- M
-
-
- λ
- 2
-
-
- n
- 2
-
- 1
- -
- (
- n
- 2
- /
- n
- 1
- )
- 2
- ,
- where n1 is the refractive index of the wedge-shaped light guide, n2 is the refractive index of the cladding layer, and M is an odd integer;
- and
- a turning film bonded to the cladding layer via an interface layer, the interface layer having a third refractive index matched to the first refractive index.
A system for displaying a visible image on a surface, the system comprising:
- an image-creating subsystem adapted to create the visible image from light from a light source;
- and
- an optic configured to turn and project the light to display the visible image on the surface, the optic comprising:
- a wedge-shaped light guide having opposing first and second faces and comprising a material having a first refractive index, the first face supporting a first cladding layer having a second refractive index less than the first refractive index, the second face supporting a second cladding layer having a fourth refractive index less than the first refractive index and nearer to the second refractive index than to the first refractive index;
- and
- a turning film bonded to the cladding layer via an interface layer, the interface layer having a third refractive index matched to the first refractive index.
Dependencies are inferred from the claim text.