Head-up display optical film, head-up display, and vehicle
AssigneeKabushiki Kaisha Toshiba
InventorsNaotada OKADA, Kazuo Horiuchi, Haruhiko Okumura, Takashi Sasaki
Life of this patent
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Abstract
A head-up display optical film includes: a first optical layer configured to convert the polarization plane of incident light by 90 degrees; a second optical layer configured to convert the polarization plane of incident light by 90 degrees; and an intermediate optical layer sandwiched between the first optical layer and the second optical layer and having a refractive index that is different from the refractive index of the first optical layer and from the refractive index of the second optical layer.
Claims20
A head-up display optical film comprising:
- a first optical layer configured to convert the polarization plane of incident light by 90 degrees;
- a second optical layer configured to convert the polarization plane of incident light by 90 degrees;
- and
- an intermediate optical layer sandwiched between the first optical layer and the second optical layer and having a refractive index that is different from the refractive index of the first optical layer and from the refractive index of the second optical layer.
A head-up display comprising:
- a head-up display optical film including:
- a first optical layer configured to convert the polarization plane of incident light by 90 degrees;
- a second optical layer configured to convert the polarization plane of incident light by 90 degrees;
- and
- an intermediate optical layer sandwiched between the first optical layer and the second optical layer and having a refractive index that is different from the refractive index of the first optical layer and from the refractive index of the second optical layer;
- and
- a projector configured to cause a P-polarized light beam to be incident on the optical film at Brewster's angle.
A vehicle comprising:
- a generally plate-like transparent plate;
- and
- a head-up display including:
- a head-up display optical film including:
- a first optical layer configured to convert the polarization plane of incident light by 90 degrees;
- a second optical layer configured to convert the polarization plane of incident light by 90 degrees;
- and
- an intermediate optical layer sandwiched between the first optical layer and the second optical layer and having a refractive index that is different from the refractive index of the first optical layer and from the refractive index of the second optical layer;
- and
- a projector configured to cause a P-polarized light beam to be incident on the optical film at Brewster's angle;
- the head-up display optical film being provided on a major surface of the transparent plate.
Dependencies are inferred from the claim text.