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US 2006/0139960 A1Published application
Surface light source device and display apparatus using the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsSeiji Sakai, Toshiyuki Yoneda
Life of this patent
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Abstract
A surface light source device includes a housing having an opening portion provided in a top surface thereof, a reflection sheet disposed on a bottom surface of the housing, a light guide plate disposed on the reflection sheet on a side of the opening, and a light source disposed on at least one of side surfaces of the housing. The reflection sheet has a first reflection region on a side opposite to the light source, and a reflectance of the first reflection region at shorter wavelengths in a wavelength region of visible light outputted from the light source is higher than a reflectance at longer wavelengths in the wavelength region of the visible light.
Claims20
A surface light source device comprising:
- a housing having an opening portion provided in a top surface thereof;
- a reflection sheet disposed on a bottom surface of the housing;
- a light guide plate disposed on the reflection sheet on a side of the opening;
- and
- a light source disposed on at least one of side surfaces of the housing,
- wherein the reflection sheet has a first reflection region on a side opposite to the light source, and
- a reflectance of the first reflection region at shorter wavelengths in a wavelength region of visible light outputted from the light source is higher than a reflectance at longer wavelengths in the wavelength region of the visible light.
4 more elements
A surface light source device comprising:
- a housing having an opening portion provided in a top surface thereof;
- a reflection sheet disposed on a bottom surface of the housing;
- a light guide plate disposed on the reflection sheet on a side of the opening;
- and
- a light source disposed on at least one of side surfaces of the housing,
- wherein the reflection sheet has a second reflection region on a side of the light source, and
- a reflectance of the second reflection region at shorter wavelengths in a wavelength region of visible light outputted from the light source is lower than a reflectance at longer wavelengths in the wavelength region of the visible light.
4 more elements
A surface light source device comprising:
- a housing having an opening portion provided in a top surface thereof;
- a light guide plate disposed in the housing corresponding to the opening portion;
- a reflection sheet disposed on a bottom surface of the housing;
- a color mixing light guide plate disposed between the reflection sheet and the bottom surface of the housing;
- and
- a light source disposed on an incidence face of the color mixing light guide plate,
- wherein the reflection sheet has a reflection region, and
- a reflectance of the reflection region of at least a part of wavelength in a wavelength region corresponding to a wavelength region of visible light outputted from the light source differs from a reflectance of other wavelength in the wavelength region.
5 more elements
A surface light source device comprising:
- a housing having an opening portion;
- a diffusion plate disposed along the opening portion;
- a reflection sheet disposed in the housing to form a hollow region between the diffusion plate and the reflection sheet;
- and
- a light source disposed in the housing,
- wherein the reflection sheet has a reflection region, and
- a reflectance of the reflection region of at least a part of wavelength in a wavelength region corresponding to a wavelength region of visible light outputted from the light source differs from a reflectance of other wavelength in the wavelength region.
4 more elements
A surface light source device comprising:
- a housing having an opening portion provided-in a top surface thereof;
- at least one reflection sheet disposed on a bottom surface of the housing;
- and
- a light source disposed in the housing,
- wherein the surface light source device has a plurality of reflection sheets;
- at least one of the reflection sheets is a first reflection sheet having a reflection region adapted to vary a reflectance in a surface thereof, and
- the surface of the first reflection sheet, in which the reflection region is provided, faces other reflection sheets.
4 more elements
A surface light source device comprising:
- a housing having an opening portion provided in a top surface thereof;
- a reflection sheet disposed on a bottom surface of the housing;
- a color conversion sheet disposed on the reflection sheet on a side of the opening;
- and
- a light source disposed in the housing,
- wherein the color conversion sheet has a transmission region adapted to vary a transmissivity in a surface thereof.
3 more elements
A display apparatus comprising:
- a surface light source device;
- and
- a display portion disposed on an upper part of the surface light source device,
- wherein the surface light source device includes:
- a housing having an opening portion provided in a top surface thereof;
- a reflection sheet disposed on a bottom surface of the housing;
- a light guide plate disposed on the reflection sheet on a side of the opening;
- and
- a light source disposed on at least one of side surfaces of the housing,
- the reflection sheet has a first reflection region on a side opposite to the light source, and
- a reflectance of the first reflection region at shorter wavelengths in a wavelength region of visible light outputted from the light source is higher than a reflectance at longer wavelengths in the wavelength region of the visible light.
8 more elements
Dependencies are inferred from the claim text.