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CMOS-controlled color-tunable smart display

Zhang, Shuailong and Gong, Zheng and McKendry, Jonathan and Watson, Scott and Cogman, Andrew and Xie, Enyuan and Tian, Pengfei and Gu, Erdan and Chen, Zhizhong and Zhang, Guoyi and Kelly, Anthony and Henderson, Robert and Dawson, Martin (2012) CMOS-controlled color-tunable smart display. IEEE Photonics Journal, 4 (5). 1639 - 1646. ISSN 1943-0655

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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.