Apparatus for providing heads-up display image
Provided is an apparatus for providing a heads-up display (HUD) image. The apparatus includes a display configured to emit light with a first polarization, the light including HUD image information, a first wave plate configured to transmit light with a second polarization by shifting a phase of the light with the first polarization by 90 degrees, and a second wave plate configured to transmit light with a third polarization by shifting a phase of a portion of the light with the second polarization by 90 degrees and to reflect another portion of the light with the second polarization toward a user. The light with the third polarization may be transmitted through a windshield.
1. An apparatus for providing a heads-up display (HUD) image, the apparatus comprising:
a display configured to emit light with a first polarization including HUD image information;
a window configured to transmit the light with the first polarization;
a first wave plate provided on the window and configured to transmit light with a second polarization by shifting a phase of the light with the first polarization by 90 degrees; and
a second wave plate configured to transmit light with a third polarization by shifting a phase of a portion of the light with the second polarization by 90 degrees and to reflect another portion of the light with the second polarization toward a user,
wherein the window is provided between the display and the first wave plate in a path of the light.
2. The apparatus of claim 1 , further comprising a windshield, wherein the light with the third polarization is transmitted through a windshield.
3. The apparatus of claim 1 , further comprising a windshield, wherein the light with the third polarization is incident on the windshield at Brewster's angle.
4. The apparatus of claim 1 , wherein the first polarization is a horizontal linear polarization, the second polarization is a circular polarization, and the third polarization is a vertical linear polarization.
5. The apparatus of claim 1 , further comprising a windshield combined with the second wave plate to be directly adjacent to each other.
6. The apparatus of claim 1 ,
wherein the window and the first wave plate are combined to be directly adjacent to each other.
7. The apparatus of claim 1 , wherein the second wave plate is provided between a windshield and the first wave plate in the path of the light.
8. The apparatus of claim 1 , further comprising:
a first mirror positioned such that the light with the first polarization emitted from the display is incident thereon and configured to reflect the light with the first polarization; and
a second mirror positioned to reflect the light with the first polarization from the first mirror toward the first wave plate.
9. The apparatus of claim 8 , wherein the window is positioned between first wave plate and the first and second mirrors in the path of the light.