IMAGE DISPLAY DEVICE

摘要

Provided is an image display device that attains see-through characteristics and visual perceptibility with a simple structure.;An image display device includes a frame, a signal generation unit (light source unit) that generates signal light L1 that is a TE wave, a scan light emission unit that is provided with a light scan unit 42 (light scanner) that scans the signal light L1, a reflection unit 6 (reflecting optical unit) that reflects the signal light L1 scanned by the light scan unit 42; a diffracting optical unit 9 that includes a pair of diffraction gratings whose grating patterns are equivalent to each other and diffracts the signal light L1 reflected at the reflection unit 6; and a polarizing plate 8 (polarization selection unit) that is located at an opposite side in relation to the diffracting optical unit 9 with respect to the reflection unit 6 and allows outside-world light L2 that is a TM wave to pass toward the reflection unit 6, wherein the diffracting optical unit 9 diffracts the signal light L1 and does not diffract the outside-world light L2. The signal light L1 is split into plural beams at the diffracting optical unit 9 to enter the eye EY of a user.

主权项

1. An image display device, comprising:
a light source unit that emits first polarized light that is polarized in a first direction; a light scanner that scans the first polarized light emitted from the light source unit; a reflecting optical unit that reflects the first polarized light scanned by the light scanner and allows second polarized light to pass, the second polarized light being polarized in a second direction that is orthogonal to the first direction; a diffracting optical unit that includes a first diffraction grating and a second diffraction grating whose grating patterns are equivalent to each other and diffracts the first polarized light reflected at the reflecting optical unit; and a polarization selection unit that is located at an opposite side in relation to the diffracting optical unit with respect to the reflecting optical unit and allows second polarized light to pass, wherein the diffracting optical unit diffracts the first polarized light and does not diffract the second polarized light, and wherein the second diffraction grating diffracts the first polarized light diffracted at the first diffraction grating.