Lighting device for display device and display device using the same
AssigneeSharp Kabushiki Kaisha
InventorYoshiki Takata
Life of this patent
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Abstract
A backlight device includes a light guide plate opposed to fluorescent tubes, a diffusion sheet stacked on the light guide plate, and lens sheets further stacked on the diffusion sheet. A tip end of a corner portion of the diffusion sheet has a shape defined by removing a portion of the sheet along a straight line spanning between two sides constituting the corner portion. In first of the lens sheets, a tip end portion of a corner portion formed by two sides has a shape defined by removing a portion of the sheet in a larger amount than in the diffusion sheet by a circular arc which projects outward. In a second of the lens sheets, a tip end of a corner portion formed by two sides has a shape defined by removing a larger amount than in the first of the lens sheets along a straight line.
Claims7
A lighting device for a display device, comprising:
- a plurality of optical sheets each having corner portions and each having a shape in which a tip end of one of the corner portions is removed along a line segment spanning between two sides constituting said one of the corner portions so as to produce a remaining portion;
- a sheet layered body including the plurality of optical sheets and through which light from a light source passes;
- wherein
- shapes of the line segments spanning between respective two sides constituting the corner portions of adjacent ones of the plurality of optical sheets differ from each other.
Dependencies are inferred from the claim text.