CMOS-Controlled Color-Tunable Smart Display

oleh: Shuailong Zhang, Zheng Gong, Jonathan J. D. McKendry, Scott Watson, Andrew Cogman, Enyuan Xie, Pengfei Tian, Erdan Gu, Zhizhong Chen, Guoyi Zhang, Anthony E. Kelly, Robert K. Henderson, Martin D. Dawson

Format: Article
Diterbitkan: IEEE 2012-01-01

Deskripsi

We demonstrate a color-tunable smart display system based on a micropixelated light-emitting diode <formula formulatype="inline"><tex Notation="TeX">$(\mu\hbox{LED})$</tex></formula> array made from one InGaN epitaxial structure with high (0.4) indium mole fraction. When integrated with custom complementary metal&#x2013;oxide&#x2013;semiconductor (CMOS) electronics and a CMOS driving board with a field-programmable gate array (FPGA) configuration, this <formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{LED}$</tex></formula> 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 <formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{LED}$</tex></formula> 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 <formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{LED}$</tex></formula> 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.