MULTICOLORED LINEAR LIGHT SOURCE
A multicolored linear light source is disclosed. In an embodiment, the multicolored linear light source comprises a linear light source emanating light of a first spectrum, and regions of photoluminescent material. The light of the first spectrum interacts with regions of photoluminescent material to give light of a different spectrum. The composition of different regions of photoluminescent material is different, providing light of different spectra in different regions. Coupled to each region of photoluminescent material is a columnar light guide such that light produced by the regions traverses respective columnar light guides and gets extracted.
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This patent is a continuation of U.S. patent application Ser. No. 12/667,526 entitled “MULTICOLORED LINEAR LIGHT SOURCE” filed on Jul. 9, 2010, which in turn claims priority from provisional patent number 1284/MUM/2007 titled “Multicolored Linear Light Source” filed on the 5th of Jul. 2007 in Mumbai, India.
TECHNICAL FIELDThe present invention relates to a source of illumination. Particularly, the invention relates to an apparatus and method for a source of illumination producing multiple colors.
BACKGROUND ARTA source of illumination is used for lighting purposes. A linear light source may be used as a source of illumination to provide light in the backlights of display systems. In color transmissive display systems such as liquid crystal displays, the backlights are designed to provide light into the liquid crystal sheet. The light emanating from the liquid crystal sheet passes through a sheet of color filters. The color filter sheet allows only light of a particular color to pass through and blocks light of other colors. So, a significant proportion of light emanating from the backlight is blocked by the color filter sheet, reducing the efficiency of the display.
There exists prior art wherein a color display is lighted by column sources of light, each column carrying light of a particular color. A multicolored light source is needed so that light of various colors is coupled into the various columns. The multicolored linear light sources known in art are cumbersome and costly to produce. Thus, there is a need for a simple and cheaper multicolored linear light source.
A photoluminescent tube (usually known as a fluorescent tube) is used as a source of illumination for backlights in displays. A photoluminescent tube is made of a gas discharge tube coated with photoluminescent material on the surface of the tube. When a high voltage is applied across the tube, ionization of the gases occurs. These ions emit photons which hit the photoluminescent materials on the surface. The photoluminescent materials on the surface emit light of a particular spectrum. Photoluminescent material is any material which absorbs photons and hence emits photons. Photoluminescent materials include fluorescent materials, phosphorescent materials and scintillators.
SUMMARYA multicolored linear light source is disclosed. In an embodiment, the multicolored linear light source comprises a linear light source emanating light of a first spectrum, and regions of photoluminescent material. The light of the first spectrum interacts with regions of photoluminescent material to give light of a different spectrum. The composition of different regions of photoluminescent material is different, providing light of different spectra in different regions.
The above and other preferred features, including various details of implementation and combination of elements are more particularly described with reference to the accompanying drawings and pointed out in the claims. It will be understood that the particular methods and systems described herein are shown by way of illustration only and not as limitations. As will be understood by those skilled in the art, the principles and features described herein may be employed in various and numerous embodiments without departing from the scope of the invention.
The accompanying drawings, which are included as part of the present specification, illustrate the presently preferred embodiment and together with the general description given above and the detailed description of the preferred embodiment given below serve to explain and teach the principles of the present invention.
A multicolored linear light source is disclosed. In an embodiment, the multicolored linear light source comprises a linear light source emanating light of a first spectrum, and regions of photoluminescent material. The light of the first spectrum interacts with regions of photoluminescent material to give light of a different spectrum. The composition of different regions of photoluminescent material is different, providing light of different spectra in different regions.
A multicolored linear light source is disclosed. It is understood that the embodiments described herein are for the purpose of elucidation and should not be considered limiting the subject matter of the present patent. Various modifications, uses, substitutions, recombinations, improvements, methods of production without departing from the scope or spirit of the present invention would be evident to a person skilled in the art.
Claims
1. An apparatus comprising:
- a light source emanating light of a first spectrum,
- a plurality of regions of photoluminescent material disposed on the surface of the light source, and
- a plurality of light guides situated perpendicular to the light source, wherein least a first region of photoluminescent material and a second region of photoluminescent material emanate light of different spectra.
2. The apparatus of claim 1, wherein the light source is a gas discharge tube.
3. The apparatus of claim 1, wherein the light source comprises a light guide, diffuser particles and a second light source.
4. The apparatus of claim 1, further comprising a mirror partially covering the surface of the light source, wherein
- the plurality of regions of photoluminescent material is disposed in an area where
- the mirror is not disposed on the surface of the light source.
5. The apparatus of claim 1, wherein each light guide of the plurality of light guides is situated closed to a particular region of the plurality of regions of photoluminescent material.
6. The apparatus of claim 1, wherein each light guide of the plurality of light guides further comprises means of extracting light.
7. The apparatus of claim 6, wherein the means of extracting light comprises particles that scatter light.
8. The apparatus of claim 1, wherein the light source comprises a second light guide, and a second light source situated near the end of the second light guide, the second light guide comprising means of extracting light.
9. The apparatus of claim 5, wherein the means of extracting light comprises particles that scatter light.
10. The apparatus of claim 6, further comprising a display lighted by the plurality of light guides.
Type: Application
Filed: Nov 15, 2012
Publication Date: Mar 21, 2013
Applicant: I2IC CORPORATION (Foster City, CA)
Inventors: Udayan Kanade (Pune), Gaurav Kulkarni (Pune), Karthikk Sridharan (Minneapolis, MN), Manas Alekar (Irvine, CA), Manohar Joshi (Pune), Sanat Ganu (Pune), Balaji Ganapathy (Atlanta, GA)
Application Number: 13/677,530
International Classification: H01J 61/48 (20060101);