CPC G02B 6/003 (2013.01) [G02B 6/005 (2013.01); G02B 6/0076 (2013.01)] | 23 Claims |
1. An optical device comprising:
a first backlight configured to output first light of a first wavelength, the first backlight comprising a first light guide plate transmitting the first light and comprising a first output coupler through which the first light output;
a first lens disposed to face the first output coupler and having a refractive power with a focal length of f1_1 with respect to the first light of the first wavelength;
a second backlight configured to output second light of a second wavelength, the second backlight comprising a second light guide plate transmitting the second light and comprising a second output coupler through which the second light output, the second output coupler being disposed in parallel to the first output coupler;
a second lens disposed to face the second output coupler and having a refractive power with different focal lengths of f2_1 and f2_2 with respect to the first light of the first wavelength and the second light of the second wavelength, respectively;
a third backlight configured to output third light of a third wavelength, the third backlight comprising a third light guide plate transmitting the third light and comprising a third output coupler through which the third light output, the third output coupler being disposed in parallel to the first output coupler; and
a third lens disposed to face the third output coupler and having a refractive power with different focal lengths of f3_1, f3_2 and f3_3 with respect to the first light of the first wavelength, the second light of the second wavelength, and the third light of the third wavelength, respectively.
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