Patent ID: 9523878
Filing Date: 2016-12-20
CPC Classification: G02B,G02F

Claim Text:
1. A display device comprising: a plurality of display units, each display unit having: a display panel with an outer display surface having one or more peripheral edges, the display panel being configured to display images; and a frame positioned along at a portion of one of the one or more peripheral display panel edges; wherein, the plurality of display units are arranged in an array with a portion of one of each display unit frame and outer display surface edges abutting a portion of one of another display unit frame and outer display surface edges; and a light guide unit having: a plurality of first gratings forming a first light guide, each of the plurality of first gratings having a first side facing the outer display surface of the plurality of display units, a second side facing opposite the first grating first side and a peripheral edge, with each first grating corresponding to one of the plurality of display units and configured to refract light emitted from the display panel of the display unit towards the peripheral edge of the first grating; and a plurality of second gratings forming a second light guide, each of the plurality of second gratings having a first side facing the second side of the first light guide, a second side facing opposite the first side and a peripheral edge, with each second grating corresponding to one of the plurality of first gratings and configured to reversedly refract light emitted from a display panel of the display unit and through a first grating, away from the peripheral edge of the second grating; wherein, a plurality of first prisms are formed in each second side of the plurality of first gratings, with each of the plurality of first prism having a first prism first surface and a first prism second surface, the second surface of each first prism being positioned closer to the peripheral edge of the first grating than the first surface of each first prism, and the first prism surface of each first prism being at an angle to a plane of the first grating; wherein, a plurality of second prisms are formed in each first side of the plurality of second gratings, with each of the plurality of second prisms having a second prism first surface and second prism second surface, with each of the plurality of second prisms formed to correspond to one of the plurality of first prisms and with the first prism first surface being substantially parallel to the first surface of a corresponding second prism; wherein, each first grating has a peripheral first prism positioned nearest each first grating peripheral edge, and an angle between the first surface of each peripheral first prism is calculated according to the following formula: wherein, b represents a width of the frame, d represents a distance between a plane of the first grating and a plane of the second grating, θ is a deflection angle of the light emitting from the nearest first prism surface, n