Light-guiding plate, light-guiding plate manufacturing method, and video display device
AssigneeHitachi-LG Data Storage, Inc.
InventorsTakeru Utsugi, Ryuji Ukai
Life of this patent
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Abstract
The present invention provides a light-guiding plate which is applicable to incident rays over a wide ray angular range and wide wavelength rage, and is able to suppress a decrease in optical efficiency. A light-guiding plate 200 having a light diffracting portion 1200 for diffracting incident light by a multiple-recorded hologram is configured such that, in the light diffracting portion, when light 1210 of a single wavelength having a certain angular range is incident, at least two or more outgoing rays 1220 are discretely emitted with a first angular space θs, and the emitted rays each have a second angular range θa, and the first angular space θs is equal to or larger than the second angular range θa.
Claims13
A light-guiding plate comprising:
- a light diffracting portion diffracting incident light by a multiple-recorded hologram,
- wherein, in the light diffracting portion, when light of a single wavelength having a certain angular range is incident, at least two or more outgoing rays are discretely emitted with a first angular space θs, and the emitted rays each have a second angular range θa, and the first angular space θs is equal to or larger than the second angular range θa, and
- wherein the angular relationship satisfies θs>kθa (k is a real number of 3 or more).
A video display device displaying an image emitted from an image projection unit to eyes of a user through a light-guiding plate,
- wherein the image projection unit uses a light emitting diode (LED) light source that is pseudo white light,
- wherein the light-guiding plate has a light diffracting portion diffracting incident light by multiple-recorded holograms,
- wherein, in the light diffracting portion, when light of a single wavelength having a certain angular range is incident, at least two or more outgoing rays are discretely emitted with a first angular space θs, and the emitted rays each have a second angular range θa, and the first angular space θs is equal to or larger than the second angular range θa, and
- wherein the angular relationship satisfies θs>kθa (k is a real number of 3 or more).
Dependencies are inferred from the claim text.