Display device comprising a light guide
AssigneeKoninklijke Philips Electronics N.V.
InventorGerardus G.P. Van Gorkom
Life of this patent
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Abstract
A display device is provided with a source for UV radiation. The UV radiation is led into a light guide, and at addressed position(s) where a movable element makes contact with the light guide, the UV light exits the light guide and enters the movable element. The movable element is provided with scattering particles which scatter more efficiently in the light than in visible light. Scattered UV light impinges on UV-sensitive phosphor elements. In alternative embodiments, the movable element is provided with phosphor particles embedded in the material of the movable element.
Claims11
A display device with a light source and a display part comprising a light guide, a movable element and selection means to locally and selectively bring said movable element into contact with the light guide to couple light out of the light guide, characterized in that the light source is a source for UV radiation, the movable element comprises means for scattering UV light, the display device comprises phosphor elements for emitting visible light at different colors when excited by UV radiation, and the phosphor elements comprise phosphor particles in an embedding material.
A display device with a light source and a display part comprising a light guide, a movable element and selection means to locally and selectively bring said movable element into contact with the light guide to couple light out of the light guide, characterized in that the light source is a source for UV radiation, the movable element comprises scattering particles for scattering light in an embedding material, and the display device comprises phosphor elements for emitting visible light at different colors when excited by UV radiation, the particles for scattering UV light in the embedding material having a scattering efficiency for the UV radiation emitted by the source, which is larger than the scattering efficiency for light in the visible range.
A display device with a light source and a display part comprising a light guide, a movable element and selection means to locally and selectively bring said movable element into contact with the light guide to couple light out of the light guide, characterized in that the light source is a source for UV radiation, and the movable element comprises particles in an embedding material for converting UV light into visible light.
A display device as claimed in claim 11, characterized in that the phosphor particles have an average size which is smaller than λ/π, where λ is the wavelength of the UV radiation emitted by the source.
Dependencies are inferred from the claim text.