Colorimetry: LED Fundamentals

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In this presentation on Colorimetry we will look at how the eye perceives color, and discuss several metrics which describe color.

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Colorimetry: LED Fundamentals

  1. 1. LED FundamentalsOptical Basics pColorimetry07-07-2011
  2. 2. Light and the Eye The eye has incredible dynamic rangeLED Fundamentals | Colorimetry | Page 2
  3. 3. Colorimetry Colorimetry is the science that describes colors in terms of numbers. Metamerism – different power spectra, same color coordinatesLED Fundamentals | Colorimetry | Page 3
  4. 4. Colorimetry  Roughly speaking the retina of the human eye has photoreceptors for red green and speaking, red, green, blue.  Spectral distribution coefficients have been defined which allow us to compute color coo d a es coordinates.LED Fundamentals | Colorimetry | Page 4
  5. 5. Color CoordinatesLED Fundamentals | Colorimetry | Page 5
  6. 6. CIE Chromaticity Diagram (u′, v′) chromaticity diagram, also known as the CIE 1976LED Fundamentals | Colorimetry | Page 6
  7. 7. Correlated Color Temperature (CCT)• Temperature of a blackbody radiator p y closest in appearance.• Attempt to use a single number to characterize a full spectrum.• Pl ki l Plankian locus: colors of bl kb d l f blackbody radiators• Judd lines: perpendicular to Plankian locus in uv color space• CCT: for colors on a Judd line, CCT is the temperature of the blackbody radiator at the intersection with the Plankian curveLED Fundamentals | Colorimetry | Page 7
  8. 8. Color Rendering Index (CRI) Fair 50-70 CRI Better 70-80 CRI Best 80-100 CRI Source: Energy StarLED Fundamentals | Colorimetry | Page 8
  9. 9. MacAdam Ellipse Region in color space containing those colors which are indistinguishable to the average human eye from the color at the center of the ellipse.LED Fundamentals | Colorimetry | Page 9
  10. 10. Example of OSRAM’s Binning Scheme0.45 3000K 3500K 9 3-step MacAdams ellipses 8 4000K 7 Planck 6 4500K0.40 5 5000K 4 W X 5700K T U V S R 6500K Q ANSI C78.377 P O q quadrangles g N0.35 M 2500K L K 3000K J 8 I 7 H 4000K 6 G F 5 E 4 D C0.30 0.28 0.33 0.38 0.43 0.48 LED Fundamentals | Colorimetry | Page 10
  11. 11. Disclaimer All information contained in this document has been checked with the greatest care. OSRAM Opto Semiconductors GmbH can however, not be made liable for any damage that occurs in connection with the use of these contents. OSRAM Opto Semiconductor GmbH makes no representations and warranties as to a possible interference with third parties intellectual property rights in view of products originating from one of OSRAM Opto Semiconductor GmbHs partners, or in view of products being a combination of an OSRAM Opto Semiconductor GmbHs product and a GmbH s product of one of OSRAM Opto Semiconductor GmbHs partners. Furthermore, OSRAM Opto Semiconductors GmbH cannot be made liable for any damage that occurs in connection with the use of a product of one of OSRAM Opto Semiconductor GmbHs partners, or with the use of a combination of an OSRAM Opto Semiconductor GmbHs product and a product of one of OSRAM Opto Semiconductor GmbHs partners.LED Fundamentals | Colorimetry | Page 11
  12. 12. Disclaimer This document constitutes neither an offer to sell nor a solicitation to buy or subscribe for f securities. Any such offer will b made solely on th b i of th S iti A h ff ill be d l l the basis f the Securities iti Prospectus yet to be approved by the German Financial Supervisory Authority (BaFin) and published thereafter. The information legally required to be provided to investors will be contained only in the Securities Prospectus Prospectus. The information contained herein is not for distribution, directly or indirectly, in or into the United States of America (including its territories and possessions of any State of the United States of America or the District of Columbia) and must not be distributed to U.S. persons (as defined in Regulation S under the U.S. Securities Act of 1933, as amended ("Securities Act")) or publications with a general circulation in the United States of America. This document is not an offer of securities for sale in the United States of America. The securities have not been and will not be registered under the Securities Act and may not be offered or sold in the United States of America absent registration or an exemption from registration under the Securities Act. The Issuer does not intend to register any portion of the offering in the United States of America or to conduct a public offering of the securities in the United States of America. This document is not an offer of securities for sale in the United Kingdom, Canada, Japan or Australia Australia.LED Fundamentals | Colorimetry | Page 12
  13. 13. Thank you for your attention.LED Fundamentals | Colorimetry | Page 13

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