| CPC G02B 6/34 (2013.01) [G02B 27/0101 (2013.01); G02B 27/0172 (2013.01); G02B 2027/011 (2013.01); G02B 2027/0178 (2013.01)] | 17 Claims |
|
1. A display device comprising:
a light guide plate;
a plurality of reflective prisms configured to reflect an imaging beam toward the light guide plate, wherein the imaging beam reflected by each reflective prism of the plurality of reflective prisms travels within the light guide plate at an angle greater than a critical angle of the light guide plate; and
a diffraction grating configured to diffract the imaging beam traveling within the light guide plate to an angle less than or equal to the critical angle of the light guide plate,
wherein each reflective prism of the plurality of reflective prisms comprises a first surface in contact with the light guide plate, a second surface configured to reflect the imaging beam, and a third surface connected to the first surface and the second surface,
wherein the imaging beam reflected by the second surface of each reflective prism of the plurality of reflective prisms travels in a direction away from the third surface of each reflective prism of the plurality of reflective prisms, and an angle of a travelling direction of the imaging beam with respect to the first surface is greater than an angle of the third surface with respect to the first surface,
wherein the plurality of reflective prisms comprise a first reflective prism, a second reflective prism, and a third reflective prism, and
wherein a first angle between the second surface and the first surface of the first reflective prism is greater than a second angle between the second surface and the first surface of the second reflective prism, and the second angle is greater than a third angle between the second surface and the first surface of the third reflective prism.
|