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US 12,596,220 B2Granted
Light guide plate, light guide plate unit, and display device
AssigneePanasonic Automotive Systems Co., Ltd.
InventorsKeiji Sugiyama, Ken'ichi Kasazumi, Yukihiro Chokyu, Satoshi Kuzuhara, Kazuhiro Minami
Life of this patent
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Abstract
A light guide plate includes a hologram element that is a first hologram element including two or more diffraction cells, and a hologram element that is a second hologram element including a single diffraction cell.
Claims20
A light guide plate comprising:
- a first hologram element;
- and
- a second hologram element, wherein
- the first hologram element includes interference fringes having intervals larger than intervals of interference fringes included in the second hologram element,
- the first hologram element is an emission-side hologram element,
- the second hologram element comprises two second hologram elements which are an entrance-side hologram element and a deflecting hologram element,
- the entrance-side hologram element is positioned to cause light that has entered from an outside to an inside of the light guide plate to propagate in the inside of the light guide plate by deflection through diffraction,
- the deflecting hologram element is positioned to cause the light deflected in a first direction by the entrance-side hologram element to propagate in the inside of the light guide plate in a second direction, crossing the first direction, by deflection through diffraction, and
- the emission-side hologram element is positioned to cause the light deflected by the deflecting hologram element to be emitted to the outside of the light guide plate by deflection through diffraction.
6 more elements
A light guide plate unit comprising:
- a first light guide plate including a first hologram element and a second hologram element;
- a second light guide plate including a third hologram element and a fourth hologram element;
- a first deflecting element that causes light of a first wavelength component included in incoming light to enter the first light guide plate, by selectively deflecting the light of the first wavelength component;
- and
- a second deflecting element that causes light of a second wavelength component included in the incoming light to enter the second light guide plate, by selectively deflecting the light of the second wavelength component, wherein
- the first hologram element and the third hologram element include interference fringes having intervals larger than intervals of interference fringes included in the second hologram element and the fourth hologram element,
- each of the first hologram element and the third hologram element is an emission-side hologram element,
- the second hologram element comprises two second hologram elements and the fourth hologram element comprises two fourth hologram elements, each of the two second hologram elements and the two fourth hologram elements being an entrance-side hologram element and a deflecting hologram element,
- the entrance-side hologram element is positioned to cause light that has entered from an outside to an inside of each of the first light guide plate and the second light guide plate to propagate in the inside of each of the first light guide plate and the second light guide plate by deflection through diffraction,
- the deflecting hologram element is positioned to cause the light deflected in a first direction by the entrance-side hologram element to propagate in the inside of each of the first light guide plate and the second light guide plate in a second direction, crossing the first direction, by deflection through diffraction, and
- the emission-side hologram element is positioned to cause the light deflected by the deflecting hologram element to be emitted to the outside of each of the first light guide plate and the second light guide plate by deflection through diffraction.
8 more elements
Dependencies are inferred from the claim text.