CMOS-controlled color-tunable smart display

Shuailong Zhang, Zheng Gong, Jonathan McKendry, Scott Watson, Andrew Cogman, Enyuan Xie, Pengfei Tian, Erdan Gu, Zhizhong Chen, Guoyi Zhang, Anthony Kelly, Robert Henderson, Martin Dawson

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We demonstrate a color-tunable smart display system based on a micropixelated light-emitting diode µLED array made from one InGaN epitaxial structure with high (0.4) indium mole fraction. When integrated with custom complementary metal–oxide– semiconductor (CMOS) electronics and a CMOS driving board with a field-programmable gate array (FPGA) configuration, this µLED device is computer controllable via a simple USB interface and is capable of delivering programmable dynamic images with emission colors changeable from red to green by tailoring the current densities applied to the µLED pixels. The color tunability of this CMOS-controlled device is attributed to the competition between the screening of piezo-electric field and the band filling effect. Comparable brightness of the µLED pixels emitting at different colors was achieved by adjusting the duty cycle. Further measurement suggests that this microdisplay system can also be used for high-speed visible light communications.
Original languageEnglish
Pages (from-to)1639 - 1646
Number of pages8
JournalIEEE Photonics Journal
Volume4
Issue number5
Early online date7 Aug 2012
DOIs
Publication statusPublished - Oct 2012

Keywords

  • photonics
  • CMOS integrated circuits
  • color tunability
  • microdisplays
  • microlight-emitting diodes
  • visible light communications

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