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US 6,669,356 B2Granted
Sheet for an illumination device, illumination device, and liquid crystal display
AssigneeSharp Kabushiki Kaisha
InventorHiroshi Okuno
Life of this patent
Estimating the term…
Abstract
An illumination device has a diffusive sheet that diffuses light. The sheet is fitted to a main body 3 of the illumination device by being sandwiched, in the direction of the thickness of the sheet, between the main body 3 and a frame 4 fitted thereto. The sheet has a cut formed in a portion thereof sandwiched between the frame 4 and the main body 3 to prevent bends that develop with a variation in temperature.
Claims21
A diffuser sheet in combination with an illumination device, the diffuser sheet having four major elongated edges which define the major sides of the sheet, the combination comprising:
- the diffuser sheet being provided inside the illumination device and fitted to a main body of the illumination device by being sandwiched, at least at a portion of the sheet and in a direction of thickness of the sheet, between the main body and a frame fitted to the main body, the diffuser sheet being located at an elevation different than an elevation(s) of a light source and a light guide into which the light source directs light so that the diffuser sheet receives light from the light guide and is at least partially located between the light guide and a device to be illuminated, the diffuser sheet being located closer to the device to be illuminated than the light source and light guide;
- wherein the sheet has a cut formed at least in a corner thereof within a region sandwiched in a direction of thickness of the sheet between the main body and the frame so that the cut does not extend beyond a frame opening line (FL) defined by a rim of an opening in said frame, wherein said cut is provided in order to prevent or reduce bending of the sheet upon change in temperature;
- wherein a point of intersection is defined by an intersection of:
- (a) a first line along a first major elongated edge of the sheet adjacent said corner, and (b) a second line along a second major elongated edge of the sheet adjacent the corner;
- wherein said point of intersection is not embedded within said main body and is not embedded within said frame so that the sheet and illumination device are sized so that the sheet would fit in the illumination device regardless of whether or not the cut was provided therein.
2 more elements
An illumination device, comprising:
- a main body of the illumination device;
- a frame fitted to the main body;
- a light source that directs light into a light guide that is located adjacent the light source;
- at least one sheet located at least partially within the main body, the sheet being located between the light guide and a device to be illuminated so that the sheet or sheets is/are at an elevation different than the light source and the light guide, the sheet having four major elongated edges which define the major sides of the sheet;
- wherein at least one cut is formed in the sheet within a region sandwiched in a direction of thickness of the sheet between the main body and the frame in order to prevent or reduce bending of the sheet upon change in temperature, and
- wherein a point of intersection is defined by an intersection of:
- (a) a first line along a first major elongated edge of the sheet adjacent said corner, and (b) a second line along a second major elongated edge of the sheet adjacent the corner;
- wherein said point of intersection is not embedded within any structural portion of the illumination device so that the sheet would fit in the illumination device regardless of whether or not the cut was provided therein.
5 more elements
A liquid crystal display comprising an illumination device and a liquid crystal display panel illuminated by the illumination device, wherein the illumination device comprises:
- a light source;
- a light guide for receiving light from the light source;
- and
- a frame having an opening defined therein for permitting passage of light from the light source;
- at least one optical sheet located at least partially between the light guide and the display panel so that the at least one sheet is at a different elevation than the light source,
- wherein a cut is formed in a corner of the at least one sheet in such a way that the cut does not overlap with said opening, in order to prevent or reduce bending of the sheet upon change in temperature, and
- wherein a point of intersection is defined by an intersection of:
- (a) a first line along a first major elongated edge of the sheet adjacent said corner, and (b) a second line along a second major elongated edge of the sheet adjacent the corner;
- wherein said point of intersection is not embedded within any structure of said display so that the sheet would fit in the illumination device regardless of whether or not the cut was provided therein.
6 more elements
An illumination device comprising:
- at least one diffuser sheet provided inside the illumination device and fitted to a main body of the illumination device, the diffuser sheet being located at an elevation above an elevation of a light source and a light guide into which the light source directs light so that the diffuser sheet receives light from the light guide and is at least partially located between the light guide and a device to be illuminated;
- wherein the diffuser sheet has a cut formed in a corner thereof within a region sandwiched in a direction of thickness of the sheet between the main body and a frame fitted to the main body in order to prevent or reduce bending of the diffuser sheet upon change in temperature, and
- wherein a point of intersection is defined by an intersection of:
- (a) a first line along a first major elongated edge of the sheet adjacent said corner, and (b) a second line along a second major elongated edge of the sheet adjacent the corner;
- wherein said point of intersection is not embedded within said main body and is not embedded within said frame fitted to the main body.
2 more elements
Dependencies are inferred from the claim text.