# US 2006/0232725 A1 · Use of a wavelength converting material to project an image or backlighting through a display panel, and backlight for exciting same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2006/0232725 A1 - Document ID: US20060232725A1 - Status: Published application - Kind: A1 - Application number: 11/139,389 - Filed: 2005-05-27 - Published: 2006-10-19 - Earliest claimed: 2005-04-18 - Assignees: Avago Technologies ECBU IP (Singapore) Pte. Ltd. - Inventors: Janet Chua; Yue Lau; Tah Tee; Rene Helbing - Web page: https://patentgrep.com/patent/US20060232725A1 ## CPC - G02B 6/005: {provided by one optical element, or plurality thereof, placed on the light output side of the light guide} - B82Y 10/00: Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic - B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals - G02F 1/133617: {Illumination with ultraviolet light; Luminescent elements or materials associated to the cell} - G02F 1/133374: {for displaying permanent signs or marks} - G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light} - G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side} - G02F 1/133626: {providing two modes of illumination, e.g. day-night} - G02F 2201/086: UV absorbing - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract In one embodiment, apparatus is provided with a display panel, a wavelength converting material, and a light source. The display panel is provided with an interface to receive control signals defining one or more primary images that are projected from the display panel. The wavelength converting material absorbs light of a first wavelength and emits light of a second wavelength. The wavelength converting material defines a secondary image that is projected from the display panel when the wavelength converting material is illuminated by the light of the first wavelength. The light source causes the wavelength converting material to be illuminated by the light of the first wavelength. ## Claims ### Claim 1 Apparatus, comprising: a display panel having an interface to receive control signals defining one or more primary images that are projected from the display panel; a wavelength converting material that absorbs light of a first wavelength and emits light of a second wavelength, the wavelength converting material defining a secondary image that is projected from the display panel when the wavelength converting material is illuminated by the light of the first wavelength; and a light source to cause the wavelength converting material to be illuminated by the light of the first wavelength. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the wavelength converting material is deposited on the display panel. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the display panel comprises a plurality of layers, including a polarizing filter layer and a liquid crystal layer; wherein the polarizing filter layer is positioned closer to the light source than the liquid crystal layer; and wherein the wavelength converting material is deposited on a surface of the display panel positioned between the polarizing filter layer and the liquid crystal layer. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the display panel comprises a plurality of layers; and wherein the wavelength converting material is deposited on a layer of the display panel that is further from the light source than a liquid crystal layer. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the display panel comprises a plurality of layers, including a filter layer through which the secondary image is projected; and wherein the filter layer blocks passage of at least some of the light of the first wavelength. ### Claim 6 (depends on 1) The apparatus of claim 1, further comprising one or more light guides, optically positioned between the light source and the display panel. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the light source emits ultraviolet light; and wherein the light of the first wavelength is ultraviolet light. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the light source emits reddish, greenish and bluish light; and wherein the light of the first wavelength is the reddish light, greenish light, bluish light, or a component or mixture thereof. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the light source emits bluish light; and wherein the light of the first wavelength is bluish light. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the light source emits ultraviolet and bluish light; wherein the light of the first wavelength is ultraviolet light; and wherein the wavelength converting material also absorbs the bluish light and emits the light of the second wavelength. ### Claim 11 (depends on 1) The apparatus of claim 1, wherein the wavelength converting material is phosphorescent. ### Claim 12 (depends on 1) The apparatus of claim 1, wherein the wavelength converting material comprises a pattern of conventional phosphors, quantum dot phosphors or nanophosphors. ### Claim 13 (depends on 1) The apparatus of claim 1, wherein the wavelength converting material is mixed with silicone, epoxy, glass, a hybrid of silicone and epoxy, or a UV curable epoxy. ### Claim 14 (depends on 1) The apparatus of claim 1, wherein the wavelength converting material is mixed with a UV inhibitor. ### Claim 15 (depends on 1) The apparatus of claim 1, wherein the wavelength converting material is mixed with a diffusing agent. ### Claim 16 (depends on 1) The apparatus of claim 1, further comprising a mechanism to activate and deactivate the light source during use of the display panel. ### Claim 17 (depends on 1) The apparatus of claim 1, wherein the image is a company logo. ### Claim 18 (depends on 1) The apparatus of claim 1, wherein the image is a battery status indicator. ### Claim 19 (depends on 1) The apparatus of claim 1, further comprising: a second light source to provide backlighting of a third wavelength for the display panel; and at least one mechanism to independently activate and deactivate the first and second light sources. ### Claim 20 (depends on 1) The apparatus of claim 1, wherein the display panel is a liquid crystal display (LCD) panel. ### Claim 21 (depends on 1) The apparatus of claim 1, wherein the light source comprises at least one light-emitting diode (LED). ### Claim 22 (depends on 1) The apparatus of claim 1, wherein the light source illuminates an area of the display panel that substantially coincides with an area defined by the wavelength converting material. ### Claim 23 Apparatus, comprising: a display panel having an interface to receive control signals defining one or more primary images that are projected from the display panel; a wavelength converting material, deposited on the display panel, that absorbs light of a first wavelength and emits light of a second wavelength, the wavelength converting material projecting a backlight through the display panel when the wavelength converting material is illuminated by the light of the first wavelength; and a light source to cause the wavelength converting material to be illuminated by the light of the first wavelength. ### Claim 24 (depends on 23) The apparatus of claim 23, further comprising a mechanism to activate and deactivate the light source during use of the display panel. ### Claim 25 A backlight for a display, comprising: a first light source to provide backlighting of at least a first wavelength; a second light source to produce light of a second wavelength, the second wavelength corresponding to an excitation wavelength of a wavelength converting material; and at least one mechanism to independently activate and deactivate the first and second light sources. ### Claim 26 (depends on 25) The backlight of claim 25, further comprising a light guide to i) receive light emitted by the first and second light sources, ii) alter at least some of the light emitted by the first light source, and ii) pass unaltered, at least some of the light emitted by the second light source.