Three types of textured indium-tin-oxide （ITO） surface, including nano-texturing and hybrid micro/nano-texturing with micro-holes （concave-hybrid-pattem） or micro-pillars （convex-hybrid-pattern）, were applied to...Three types of textured indium-tin-oxide （ITO） surface, including nano-texturing and hybrid micro/nano-texturing with micro-holes （concave-hybrid-pattem） or micro-pillars （convex-hybrid-pattern）, were applied to GaN-based light-emitting diodes （LEDs）. The nano-texturing was realized by maskless wet-etching, and the micro-texturing was achieved by standard photolithography and wet-etching. Compared to LED chips with flat ITO surface, those with nano-pattern, concave-hybrid-pattern, and convex-hybrid-pattern exhibit enhancement of 11.3%, 15.8%, and 17.9%, respectively, for the light-output powers at 20 mA. The electrical performance has no degradation. Moreover, the convex-hybrid-pattern show higher light-output efficiency under small injection current, while the concave-hybrid-pattern exhibit better light-output efficiency at large injection current. The light- extraction efficiency is simulated by use of two-dimensional finite difference time domain method, and the numer- ical results are consistent with the experiments.展开更多
Displays are one of the most indispensable electronic devices used in our daily lives.Over the past decades,display technology has evolved relentlessly,driven by innovation in materials,structures,and manufacturing pr...Displays are one of the most indispensable electronic devices used in our daily lives.Over the past decades,display technology has evolved relentlessly,driven by innovation in materials,structures,and manufacturing processes that have enabled higher image quality,larger screen size,slimmer form factor,and novel functionalities.The display market is currently dominated by liquid crystal displays(LCDs)and organic light-emitting diode(OLED)displays,but significant investment and research efforts are being directed toward emerging self-emissive display technologies,such as micro-light-emitting diodes(micro-LEDs),as well as unconventional applications such as transparent,deformable,and near-eye displays.This review article begins with a historical background of self-emissive display technology and an overview of the recent advances in organic-,quantum dot-,perovskite-,and micro-LED displays.We then critically review the current state of micro-LED technology,including its size-dependent performance issues,different types of mass transfer technologies,backplane interconnection techniques,methods for detection/repair of defective pixels,and emerging display applications,including transparent,deformable,and virtual and augmented reality(VR/AR)displays.展开更多
基金Project supported by the National High Technology Research and Development Program of China(No.2014AA032609)the Strategic Emerging Industry Special Funds of Guangdong Province(Nos.2010A081002009,2011A081301004,2012A080302003)the Fundamental Research Funds for the Central Universities(Nos.2013ZM093,2013ZP0017)
文摘Three types of textured indium-tin-oxide （ITO） surface, including nano-texturing and hybrid micro/nano-texturing with micro-holes （concave-hybrid-pattem） or micro-pillars （convex-hybrid-pattern）, were applied to GaN-based light-emitting diodes （LEDs）. The nano-texturing was realized by maskless wet-etching, and the micro-texturing was achieved by standard photolithography and wet-etching. Compared to LED chips with flat ITO surface, those with nano-pattern, concave-hybrid-pattern, and convex-hybrid-pattern exhibit enhancement of 11.3%, 15.8%, and 17.9%, respectively, for the light-output powers at 20 mA. The electrical performance has no degradation. Moreover, the convex-hybrid-pattern show higher light-output efficiency under small injection current, while the concave-hybrid-pattern exhibit better light-output efficiency at large injection current. The light- extraction efficiency is simulated by use of two-dimensional finite difference time domain method, and the numer- ical results are consistent with the experiments.
基金supported by the Korean Institute for Advancement of Technology(KIAT)grant funded by the Korean Government(MOTIE)(RS-2024-00435693,Human Resource Development Program for Industrial Innovation(Global))This research was financially supported by the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(RS-2024-00346003,2022M3H4A3A01082883,2022M3H4A1A04096380).
文摘Displays are one of the most indispensable electronic devices used in our daily lives.Over the past decades,display technology has evolved relentlessly,driven by innovation in materials,structures,and manufacturing processes that have enabled higher image quality,larger screen size,slimmer form factor,and novel functionalities.The display market is currently dominated by liquid crystal displays(LCDs)and organic light-emitting diode(OLED)displays,but significant investment and research efforts are being directed toward emerging self-emissive display technologies,such as micro-light-emitting diodes(micro-LEDs),as well as unconventional applications such as transparent,deformable,and near-eye displays.This review article begins with a historical background of self-emissive display technology and an overview of the recent advances in organic-,quantum dot-,perovskite-,and micro-LED displays.We then critically review the current state of micro-LED technology,including its size-dependent performance issues,different types of mass transfer technologies,backplane interconnection techniques,methods for detection/repair of defective pixels,and emerging display applications,including transparent,deformable,and virtual and augmented reality(VR/AR)displays.
