Design and Characterization of Active Matrix LED Microdisplays With Embedded Visible Light Communication Transmitter

Self Cite

The first real-time micro-LED (µLED) display with simultaneous visible light communication (VLC) function for text message broadcast based on a 400×240 blue µLED array is presented, demonstrating the great potential of enabling various displays using VLC technologies for futuristic IoT applications. Transmitted messages are detected and shown on an LCD.Author Keywords micro-LED display, smart display, visible light communication (VLC), text message broadcast, Internet of Things (IoT).

Section: Smart µLed Display Systemmentioning

confidence: 99%

Section: µLed Display Driver Socmentioning

confidence: 99%

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66‐3: Micro‐LED Display with Simultaneous Visible Light Communication Function

Cho

Hussain

et al. 2018

Self Cite

“…Besides, Micro-LED was also used to biomedical sensor and detector for minimally invasive operation in the soft tissues of the mammalian brain [2]. Furthermore, higher modulation bandwidth, shorter device carrier lifetime and smaller device capacitance enables Micro-LED higher modulation speed to support visible light communication (VLC), which has been reported in 2016, supporting 1.25-Mb/s for a bit error rate <10−5 up to >500cm distance with a lens [3]. Micro-LED display gained considerable attention in recent years, Prof. Z. J. Liu's team reported 360 PPI Backlight-unit-free (BLUfree) Micro-LED projector by optical synthesis in 2012 and 1700 PPI Micro-LED display in 2014 Compound Semiconductor Integrated Circuit Symposium [4][5].…”

Section: Introductionmentioning

confidence: 99%

23.5: Improvement of Ambient Contrast of Micro‐LED Devices with High Reliability

Zhang

Yan

Liu

et al. 2019

Self Cite

Micro‐LEDs are attracting more and more attention recently due to the excellent electrical and optical properties. The performance of Micro‐LEDs in different environment becomes very important in order to meet the requirement of various applications or even multi‐function mode. However, for display, we found the reflection of ambient light from metal electrode will reduce the contrast ration seriously. Therefore, more researches have be done to solve this problem and maximize the strengths of Micro‐LEDs. Here, we report the fabrication of Micro‐LEDs with varied size from 200um pitch to 20um pitch. The devices performance under different environment have been tested, showing great stability and reliability. Besides, the ambient contrast ratio (ACR) has been investigated, and a reflection elimination method has been proposed as well. Besides, according to the comparison between mini‐LED display and Micro‐LED display, the relationship between metal electrode design and light reflection has been investigated. And a trade‐off method has also been proposed, showing great potential to improve the performance of Micro‐LED display.

“…Because of the short carrier lifetime and smaller capacitance, Micro-LEDs has a higher response time. If Micro-LEDs can be used in the visible light communications (VLC), it can offer higher modulation bandwidth and modulation speed compared to traditional light source [5]. VLC is the ideal communication to implement the exhausted spectrum (figure 1) [6].…”

Section: Introductionmentioning

confidence: 99%

P‐16.1: Study of Active Matrix Circuits Design for Micro‐LED displays and Visible Light Communications

Tong

Liu

et al. 2019

Self Cite

Because Micro‐LED is the current‐driven device, there are usually two types of the matrix driving circuit, passive matrix driving circuit, and active matrix driving circuit. Comparing these two driving circuits, the active driving circuit can achieve better brightness uniformity, higher contrast and lower contrast. Therefore, most of Micro‐LEDs use active matrix driving circuit. In this paper, a study of active matrix circuit design for Micro‐LED displays and beyond display applications such as visible light communication will be reported. The pixel circuit integrates two parts of VLC together, the emitter and the receiver. When the LED is on, it can work as the emitter of VLC. When the LED is off, the photodetector can work as the receiver of the VLC. This can offer more varieties of the application, such as face‐to‐face data transmission, under‐screen fingerprint identification and so on.