Patent ID: 9164348
Filing Date: 2015-10-20
Classification: G02B,G02F

Abstract:
1. A light guide, comprising: a light-receiving surface for receiving an incident light; and a light-emitting surface comprising: a first region having a plurality of gratings spaced apart from each other by a spacing interval, each of the gratings of the first region having a respective pre-determined direction and including a plurality of prisms extending in said respective pre-determined direction, wherein a pre-determined direction of at least one of the gratings of the first region is different from a pre-determined direction of another one of the gratings of the first region, wherein the gratings of the first region cooperate to transmit a light having a wavelength in a first wavelength range, and to block a light having a wavelength in another wavelength range; wherein the gratings of the first region comprise: a second region having a plurality of gratings spaced apart from each other, and the gratings of the second region cooperating to transmit a light having a wavelength in a second wavelength range, and to block a light having a wavelength in the another wavelength range, wherein the second wavelength range is different from the first wavelength range; wherein the gratings of the first region and the gratings of the second region are extended on substantially the same level.