More Color and Brightness for Compact Displays

Technology #31001

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Showing the differences between the color garnet of up-converters according to the present invention (dashed line), NTSB standards (solid line) and organic light emitting diodes (dot-dash line)
Michael Bass, Ph.D.
Dennis Deppe, Ph.D.
Managed By
John Miner
Assistant Director 407.882.1136
Patent Protection

Composite cavity for enhanced efficiency of up-conversion

US Patent 7,804,640 B1

Composite cavity for enhanced efficiency of up-conversion

US Patent 8,270,068 B1

Emissive fibers containing up converters excited by GaAs based semiconductor light sources

US Patent 8,419,189 B1

Improve compact display performance with dense pixilation

Developed by UCF researchers, a new composite cavity enhances the absorption of pump light and improves emission of visible light for more efficient up-conversion in display technology. This invention surpasses typical devices with its lower power requirements and smaller size factor, while producing richer color and high brightness. Color-specific up-converting films and source absorption enhancing mirrors optimize output per cavity, while dense cavity integration enables high-speed active matrix addressing for brightness that requires less power. Compact design further minimizes power needs, supporting high-resolution, high-brightness emissive display chips ideal for headset display applications in education, training, medicine, and entertainment.

Technical Details

Typical up-conversion devices offer limited electrical-to-optical efficiency, reduced by source light scattering, electrical resistance, and larger size. To power a bright and colorful display, ordinary devices require more voltage and bulk than what is now possible—up to 100% source absorption under ideal conditions. The composite cavity’s Q factor (quality factor) enables a high rate of energy transfer and supports intensive semiconductor upgrading to lower electrical resistance, increasing efficiency and high-speed switching of pixels. LEDs for each of the three cavities per pixel, RGB, are tuned to each color’s up-converter by varied film thickness, for enhanced color purity, improved brightness, and reduced or eliminated optical crosstalk between up-converters. The cavity design overcomes a barrier in compact display technology by narrowing the spectral spread of colors per pixel for more defined separation, reducing space between cavities while producing a color range up to 125% greater than the HDTV standard.


  • Compact size
  • Low power use
  • Rich color
  • High brightness


  • HD displays
  • Small displays
  • Augmented reality
  • Virtual reality
  • 3D imaging

Additional Technology Numbers: 31880, 31908

See related technologies:

Resonant Cavity Enhances Efficiency of IR to Visible Light Conversion”  Technology Number: 31036

"Display Design Suitable for Projection Displays with an Increased Color Gamut" Technology Number: 31299

Low Voltage Up-converting IR-LEDs for Battery Powered Displays”  Technology Number: 31290