Patent ID: 11892662
Assignee: LG CHEM, LTD.
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  F  G

Claim 0:
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.