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Introduction to HB LEDs and Color Science
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Introduction to HB LEDs and Color Science

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Introduction of the basics behind color science, the basic operation of LEDs and HB LEDs.

Introduction of the basics behind color science, the basic operation of LEDs and HB LEDs.

Published in: Technology, Business

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  • 1. Introduction to HB LEDs and Color Science
    • Source: Cypress
  • 2. Introduction
    • Purpose
    • This training module will introduce the basics behind color science, the industry terminology used when describing colors, the basic operation of LEDs, and how HB LEDs are used.
    • Outline
    • Introduction to the science of colors
    • Introduction to LEDs and its working principle
    • Introduce one particular type of LED, the high brightness LED (HB LED) and how HB LEDs are sued for common applications.
    • Content
    • 24 pages
    • Learning Time
    • 20 minutes
  • 3. How W e S ee
  • 4. Color Spectrum
  • 5. Relaxation Oscillator Circuit
    • Everything we see = Luminance + Chromaticity
    • Luminance = Brightness
    • Chromaticity = Color
  • 6. Frequency Measurement
    • W. David Wright and John Guild perform a number of experiments on color perception in the 1920s
    • International Commission on Illumination (CIE) standardized the color spectrum in 1931
    • CIE 1931 Color Space defines the chromatic spectrum using a 2D map
  • 7. CIE 1931 Color Space Chromaticity Diagram
  • 8. Tristimulus Values
  • 9. Evolution of Lighting
  • 10. LEDs Applications
    • Architectural lighting
    • Status indicators
    • Traffic lights and signals
    • General signage
    • Flashlight
    • Aircraft cockpits, submarine and ship bridges lighting
    • Automobile (brake, turn signals, dome lights)
    • LCD TV and display backlighting
    • Stage lighting equipment
  • 11. LED Advantages
    • Energy efficient
    • Long lasting
    • Lower system cost
    • Design flexibility
    • No dimming effect
    • Ability to focus direction
    • Durable
    • Fast light up
  • 12. LED Disadvantages
    • Currently more expensive
    • New technology = New design challenges
      • Constant current drive
      • Temperature-dependence
      • No standardized “binning”
  • 13. LED Definitions
    • LED = Lighting Emitting Diode
    • Semiconductor chip encased in a solid plastic lens that emits light
    • Color emitted depends on the composition and condition of the semiconductor material used
      • Infrared
      • Visible
      • Near Ultraviolet
  • 14. LED Compon ents
  • 15. Diode Basics
  • 16. Colors of LED
    • Electrons emit photons when moving to lower orbitals
    • Band gap determines the amount of energy emitted
  • 17. Colors of LED cont’d
  • 18. Controlling LEDs LED brightness and use dependent on the current flow through the diode.
  • 19. HB LEDs vs. Standard LEDs Source: iSuppli (Solid State Lighting) One (1) candela = 12.75 lumens < 350 mA > 50 lumens High Brightness (HB) < 30 mA < 50 lumens Standard Current Luminous Flux LED Type
  • 20. High Brightness LEDs vs. High Power LEDs
    • High Power LED: > 1 Watt
    • High Brightness LED: > 50 Lumens
  • 21. HB LED Applications
  • 22. Covering the Color Needs
  • 23. Color Mixing
    • Using a few colored LEDs to cover a large range of colors
    • Requires ability to tune individual LEDs
    • Alternating the forward current causes dimming
  • 24. Conclu s ion
    • Colorime try is the science of representing colors as numerical values
    • The tristimulus values X, Y, and Z are a representation of a color ’s luminance and chromaticity
    • The CIE 1931 Chromaticity Diagram is a two-dimensional representation of all the colors visible to the average human
    • LEDs are simply diodes incased in plastic that emit photons
    • Different materials used to create different diodes emit different colors
    • High Brightness LE Ds are simply LEDs that can produce more luminance
    • HB LEDs are quickly replacing incandescent, fluorescent, and halogen lights in applications ranging from architectural lighting, general signage applications, and LCD backlights.
  • 25. Additional Resource
    • For ordering the Cypress HB LED Controller, please call our sales hotline
    • For additional inquires contact our technical service
    • Hotline
    • For more product information go to
    • http://www.cypress.com/EZ-Color