CPC G02B 5/1857 (2013.01) [B23K 26/00 (2013.01); G02B 5/18 (2013.01); G02B 6/0016 (2013.01); G02B 27/0172 (2013.01); G03F 1/00 (2013.01)] | 13 Claims |
1. A diffraction light guide plate, comprising:
a first diffraction substrate; and
a second diffraction substrate provided on the first diffraction substrate,
wherein the first diffraction substrate includes a first diffraction grating layer in direct contact with one surface of the first diffraction substrate and a second diffraction grating layer in direct contact with an opposite surface of the first diffraction substrate,
wherein the second diffraction substrate includes a third diffraction grating layer in direct contact with one surface of the second diffraction substrate and a stress compensation layer in direct contact with an opposite surface of the second diffraction substrate,
wherein the first diffraction grating layer separates light having a wavelength of 550 nm or more and 700 nm or less,
wherein the second diffraction grating layer separates light having a wavelength of 400 nm or more and 550 nm or less,
wherein the third diffraction grating layer separates light having a wavelength of 450 nm or more and 650 nm or less, and
wherein the stress compensation layer has stress in a same direction as a direction of stress of the third diffraction grating layer.
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