US 2007/0177239 A1 · Image display apparatus and head-mounted display

Abstract

Variation of the wavelength of the light emitted from a light source is reduced by a wavelength variation reduction mechanism. Hence, wavelength deviation of the intensity peak of the light emitted from the light source from the diffraction-efficiency peak of a hologram optical element is reduced. Thus, even when a high-brightness light source is used, the light emitted therefrom can be diffracted with the hologram optical element efficiently. Moreover, the heat generated by the light source is efficiently rejected through the surface of a land portion of a flexible printed circuit, is then, via an insulating layer of the flexible printed circuit, efficiently absorbed through the surface of a heat absorbing member, and is then, via a shield conductor, led out of a casing, so as to be thereby expelled.

Claims57

Dependent claims

An image display apparatus, comprising:

a light source that emits light having intensity peaks at predetermined wavelengths corresponding to three primary colors;
a display element that produces an image by modulating the light emitted from the light source, the display element having color filters corresponding to the three primary colors;
an eyepiece optical system that directs image light from the display element to an observer's eye, the eyepiece optical system having a volume-phase-type reflective hologram optical element that diffracts the light from the display element, the hologram optical element having diffraction-efficiency peaks at wavelengths corresponding to the peak-intensity wavelengths of the light emitted from the light source;
and
a wavelength variation reduction mechanism that reduces variation of wavelengths of the light emitted from the light source.

2 more elements

Dependencies are inferred from the claim text.

Image display apparatus and head-mounted display

Life of this patent

Image display apparatus and head-mounted display

Life of this patent

Abstract

Claims57