9.4‐inch 228‐ppi flexible micro‐LED display

Abstract

A 9.4-inch 228-ppi full-color micro-LED display using the flexible low temperature polysilicon thin-film transistor (LTPS-TFT) backplane has been successfully developed. In order to solve the interconnection of tiny micro-LEDs, those size are less than 30 μm, we introduced the flip-chip soldering technology for high-resolution flexible micro-LED displays. Contrast ratio of >1,000,000:1 with a brightness of 700 nits was realized by the full-color micro-LED display with uniform brightness and color shift free at any off-axis viewing angles. These supreme micro-LED visual performances will provide a more comfortable user experience for high-resolution flexible automotive applications.

Flexible and Stretchable Light-Emitting Diodes and Photodetectors for Human-Centric Optoelectronics

“…Despite the brittle nature of thin film III–V semiconductors, μ-ILEDs can be assembled and integrated into flexible and stretchable displays after their transfer to the deformable substrates, owing to their ultrathin device thickness of several tens of micrometers. − The device stability and reliability can be improved by locating the fragile active materials near the neutral mechanical plane, where tensile and compressive stresses are neutralized. For example, GaN μ-ILED layers were transferred to a liquid crystal polymer substrate and encapsulated with polytetrafluoroethylene (PTFE), which resulted in a highly flexible device (Figure A) .…”

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46.1: Invited Paper: LCD Innovations vs. OLED Performance for Automotive Applications

“…Quantum Dot OLEDs (Figure 2 Micro LEDs: This technology uses tiny semiconductor LEDs (size in the range of 10 µm) and is currently a "hot topic" in displays (principle see Figure 2 bottom left). Recent automotive demonstrators refer mainly to medium size and medium to high ppi, see Figure 7 and [5]. As micro-LEDs are mostly in prototyping stage (except some e-signage products such as Samsung's The Wall), the following statements are based more on expectations rather than on facts.…”

45‐2: 14.6‐inch 202‐ppi Rollable Micro LED Display with Color Conversion Technology

“…In recent years, the active-matrix inorganic micro LED (Light Emitting Diode) displays have attracted considerable attention due to their properties of high brightness, high contrast ratio, long operation lifetime and borderless design [1][2][3][4][5]. Meanwhile, flexible micro LED display technologies have been developed for applications of automotive display, public information display, wearable display etc.…”