Illumination device and display apparatus including same
AssigneeCanon Kabushiki Kaisha
InventorsTakao Sasakura, Noritaka Mochizuki, Hiroaki Hoshi
Life of this patent
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Abstract
A display apparatus is constituted by a planar display device and a planar illumination device therefor. A lowering in light quantity at a periphery of the planar illumination device is prevented by inserting a reflection member, such as a reflection frame, having an inside reflection surface along the periphery of the illumination device, or a combination of a scattering means and a transparent sheet member between the display device and the illumination device. A plurality of the display apparatus may be combined to allow an associate movement thereof so as to constitute a composite display apparatus, such as a head-mount display.
Claims4
A display apparatus, including:
- an illumination device comprising a planar light source showing a luminance distribution falling toward its peripheries, a scattering means disposed contiguous to the light source for scattering emitted light from the light source when the emitted light passes the scattering means, and a transparent sheet member disposed contiguous to the scattering means and having a flat major surface on a transmitted light side thereof;
- a polarizer sheet having a refractive index n′ disposed contiguous to the flat major surface of the transparent sheet member;
- and
- a display panel disposed opposite to the illumination device with respect to the polarizer sheet and illuminated by the illumination device via the polarizer sheet,
- wherein the transparent sheet member has a refractive index n so as to satisfy n>n′ for effectively directing reflected light from the major surface thereof toward the scattering means.
A display apparatus, including:
- an illumination device comprising a light source, a scattering means disposed contiguous to the light source for scattering emitted light from the light source, and a transparent sheet member disposed contiguous to the scattering means and having a flat major surface on a transmitted light side thereof;
- a polarizer sheet having a refractive index n' disposed contiguous to the flat major surface of the transparent sheet member;
- and
- a display panel disposed opposite to the illumination device with respect to the polarizer sheet and illuminated by the illumination device via the polarizer sheet,
- wherein the transparent sheet member has a refractive index n so as to satisfy n>n' for effectively directing reflected light from the major surface thereof toward the scattering means.
Dependencies are inferred from the claim text.