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US 7,623,197 B2Granted
Flat screen
AssigneeNanogate Advanced Materials GmbH
InventorMartin Klenke
Life of this patent
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Abstract
A flat screen comprises a liquid-crystal element, such as an LCD element, for representing an image. Further, a plurality of point light sources, such as LEDs, are provided. Between the point light sources and the liquid-crystal element a light-guiding element is arranged. For rendering the brightness distribution more uniform, the light-guiding element comprises at a surface thereof a plurality of diffractive surface elements arranged in cells.
Claims19
A flat screen comprising:
- a liquid-crystal element for image representation,
- an illuminating element comprising a plurality of point light sources,
- a light-guiding element arranged between the illuminating element and the liquid-crystal element, and
- diffractive surface elements at a surface of the light-guiding element, for rendering the brightness distribution and/or the wavelength distribution more uniform, wherein the surface elements have a size of 0.04-10,000 μm2 and are arranged at a distance to each other of 0-100 μm, wherein the individual surface elements are arranged at a distance to each other of 0-15 μm.
1 more element
A flat screen comprising:
- a liquid-crystal element for image representation,
- an illuminating element comprising a plurality of point light sources,
- a light-guiding element arranged between the illuminating element and the liquid-crystal element, and
- diffractive surface elements at a surface of the light-guiding element, for rendering the brightness distribution and/or the wavelength distribution more uniform, wherein the number of surface elements in the edge region, in particular in the corners, is increased.
1 more element
A flat screen comprising:
- a liquid-crystal element for image representation,
- an illuminating element comprising a plurality of point light sources,
- a light-guiding element arranged between the illuminating element and the liquid-crystal element, and
- diffractive surface elements at a surface of the light-guiding element, for rendering the brightness distribution and/or the wavelength distribution more uniform, wherein the number of point light sources in the edge region, in particular in the corners, is increased.
1 more element
Dependencies are inferred from the claim text.