Lighting device for non-emissive displays
First Claim
1. A method for improving lighting of a display having a top surface for viewing, said method comprising the steps of:
- providing a light guiding panel substantially on the top surface of the display; and
providing at least one light source adjacent to the light guiding panel for providing light thereto, wherein the light guiding panel has a first surface adjacent to the top surface of the display, a second surface opposite to the first surface, and at least one side edge for admitting a portion of the light provided by the light source through the side edge into the light guiding panel between the first and second surfaces, wherein the second surface includes a plurality of grooves having dense-rare boundaries substantially facing the light source for reflecting part of the admitted light in a total-internal reflection fashion towards the display through the first surface of the light guiding panel, and the dense-rare boundaries have a distribution density which varies according to a distance between the dense-rare boundaries and the side edge, and wherein the first surface includes a reflection reduction structure having a plurality of periodic grooves to reduce light rays reflected from the first surface toward the second surface.
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Accused Products
Abstract
A method and device for improving lighting of a display having a top surface for viewing. The device includes a light guiding panel located substantially on the top surface of the display and at least one linear light source located adjacent to the light guiding panel for providing light thereto, wherein the light guiding panel has a first surface adjacent to the top surface of the display, a second surface opposite to the first surface, and at least one side edge for admitting a portion of the light provided by the linear light source through the side edge into the light guiding panel between the first and second surfaces; and the second surface includes a plurality of elongated grooves having dense-rare boundaries for reflecting part of the admitted light in a total-internal reflection fashion towards the display through the first surface of the light guiding panel, and wherein the dense-rare boundaries have a distribution density which varies depending on a distance between the dense-rare boundaries and the side edge.
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Citations
15 Claims
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1. A method for improving lighting of a display having a top surface for viewing, said method comprising the steps of:
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providing a light guiding panel substantially on the top surface of the display; and
providing at least one light source adjacent to the light guiding panel for providing light thereto, wherein the light guiding panel has a first surface adjacent to the top surface of the display, a second surface opposite to the first surface, and at least one side edge for admitting a portion of the light provided by the light source through the side edge into the light guiding panel between the first and second surfaces, wherein the second surface includes a plurality of grooves having dense-rare boundaries substantially facing the light source for reflecting part of the admitted light in a total-internal reflection fashion towards the display through the first surface of the light guiding panel, and the dense-rare boundaries have a distribution density which varies according to a distance between the dense-rare boundaries and the side edge, and wherein the first surface includes a reflection reduction structure having a plurality of periodic grooves to reduce light rays reflected from the first surface toward the second surface. - View Dependent Claims (2, 3, 4, 5)
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6. A lighting apparatus for illuminating a display having a top surface for viewing, said apparatus comprising:
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a light guiding panel located substantially on the top surface of the display; and
at least one linear light source located adjacent to the light guiding panel for providing light thereto, wherein the light guiding panel has a first surface adjacent to the top surface of the display, a second surface opposite to the first surface, and at least one side edge for admitting a portion of the light provided by the linear light source through the side edge into the light guiding panel between the first and second surfaces, and the second surface includes a plurality of elongated grooves having dense-rare boundaries for reflecting part of the admitted light in a total-internal reflection fashion towards the display through the first surface of the light guiding panel, wherein the dense-rare boundaries have a distribution density which varies depending on a distance between the dense-rare boundaries and the side edge, and wherein the first surface includes a reflection reduction structure having a plurality of periodic grooves to reduce light rays reflected from the first surface toward the second surface. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
a linear light pipe having a peripheral surface and at least one light-input end; and
at least one light emitter adjacent the light-input end for providing light thereto, wherein the peripheral surface allows the light provided by the light emitter to transmit therethrough towards the side edge of the light guiding panel.
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11. The lighting apparatus of claim 10, wherein the linear light pipe has a longitudinal axis substantially parallel to the side edge, and the peripheral surface has a cross section substantially perpendicular to the longitudinal axis, wherein the cross section includes a curved section adjoining a reflecting surface which is located away from the side edge of the light guiding panel in order to reflect light towards the side edge through the curved section.
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12. The lighting apparatus of claim 11, wherein the reflecting surface includes a plurality of light scatterers.
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13. The lighting apparatus of claim 11, wherein the curved section has a spherical-shaped section adjacent the side edge for focusing the light reflected by the reflecting surface towards the side edge.
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14. A light guiding panel comprising:
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a first surface;
an opposing second surface; and
at least one side edge for admitting light into the light guiding panel between the first and second surfaces, wherein the first surface includes a plurality of elongated grooves having dense-rare boundaries for reflecting part of the admitted light in a total-internal reflection fashion towards the second surface, and the dense-rare boundaries have a distribution density which varies depending on a distance between the dense-rare boundaries and the side edge, and wherein the second surface includes a reflection reduction structure having a plurality of periodic grooves to reduce light rays reflected from the second surface toward the first surface. - View Dependent Claims (15)
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Specification