Monolithic full‐color microdisplay using patterned quantum dot photoresist on dual‐wavelength LED epilayers

Abstract

A passive‐matrix monolithic full‐color InGaN light emitting diode (LED) microdisplay with 40 × 40 full‐color pixels is demonstrated. Each full‐color pixel consists of red, green, and blue (RGB) subpixels that have a pitch size of 40 μm × 120 μm. The full‐color microdisplay is monolithically fabricated on blue/green dual‐wavelength LED epilayers, using red quantum dot photoresist as a color converter. Pure RGB emission and a wide color gamut are achieved, as shown by electroluminescence spectra. Full‐color patterns with controllable grayscale and color mixing can be clearly rendered driven by a full‐color microdisplay controller, indicating tremendous potential of this novel approach for full‐color LED microdisplays in the future.

Realizing Single Chip White Light InGaN LED via Dual-Wavelength Multiple Quantum Wells

“…The LED structure is further confirmed by the TEM. The selected area diffraction patterns (SADPs) are represented in Figure 2 a, where the zone axis (ZA) is along the [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ] direction. The MQWs’ structure is shown in Figure 2 b, where the 4× blue MQWs and 1× green QW are clear to be seen.…”

“…Indium gallium nitride (InGaN) light-emitting diodes (LEDs) are essential for high quality illumination [ 1 , 2 , 3 ] and high resolution, high brightness and fast response displays [ 4 , 5 , 6 ], thus playing an important role in lighting, high definition TV (HDTV), visual reality (VR)/augmented reality (AR) displays, etc. [ 7 , 8 ].…”

Technology and Applications of Micro-LEDs: Their Characteristics, Fabrication, Advancement, and Challenges

“…Song et al fabricated monolithic RGB μLEDs with QDs embedded in nanoporous GaN . Lau et al utilized a red QD photoresist as a color converter for full-color PM μLED displays …”

Laser‐Based Micro/Nano‐Processing Techniques for Microscale LEDs and Full‐Color Displays

“…Although monochromic displays can be made from Micro-LEDs emitting at the same wavelength, full-color Micro-LED displays are more desired because of the wider application prospects. So far there are two major display architectures [9,75] that have been proposed, as schematically shown in Figure 2b,c. Each configuration has its merits and disadvantages.…”