Office of Technology Transfer – University of Michigan

Fabry-Perot Color Filter to Minimize Angle Dependence for Viewing Display

Technology #5000

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Categories
Researchers
Lingjie Jay Guo
Managed By
Joohee Kim
Licensing Specialist, Physical Sciences & Engineering 734.764.8202
Patent Protection
US Patent Pending

Background

Almost all computing devices today contain liquid crystal displays (LCDs). However, LCDs exhibit poor efficiencies. Only about 3-8% of light produced by an LCD backlight is converted into a viewable image, and LCD screens can use up to 33% of a laptop’s power. Since LCD screens occupy a large fraction of a computing device’s surface area, and are often exposed to ambient light, they are ideal candidates for energy harvesting using photovoltaics.

Technology

Researchers at the University of Michigan have developed a technology for LCD color filters that can harvest energy from ambient light using integrated photovoltaics. The underlying structures used in this technology obviate the need for a liquid crystal alignment layer, polarizer sheets, and transparent electrodes, thereby making the LCD cheaper and easier to manufacture. The proposed technology is thin-film-stack-based, and can be configured as an energy harvesting transmission color filter or a reflective color filter.

Applications

  • Energy harvesting LCD displays
  • TVs, smartphones, desktop and laptop computers, tablets
  • Car navigation screens, LCD signs, e-paper
  • Devices that utilize standby mode for large portions of time

Advantages

  • Lower costs, and ease of manufacturing
  • Fewer processing steps
  • Reuse of structures
  • More efficient use of chemical materials
  • Enhanced device battery life