High‐precision and high‐stability inkjet printing technology for QD color converter‐type micro‐LED display

Abstract

This paper reports on the development of a specialized inkjet printing head and equipment for high-resolution printing of QD dispersed inks. First, to achieve a robust process, we proposed an inkjet head design compatible with higher ink viscosity and with an ink circulation system to avoid particle aggregation. Further, we introduce a multi-restrictor inside the head to minimize ink fluid pumping pulsations on the print head and a drive-pernozzle technology with individual nozzle waveform control. Results include down to 0.8 pL ± 1.8% droplet variation across all nozzles, with a three-sigma accuracy 1.0 μm for droplet landing position. By combining optimized ink, inkjet head, and equipment technology, we successfully fabricated color converter-type micro-LED display panels.

Mura‐free G8.5 220ppi inkjet printing technology for OLED and QLED display panels

“…TCL Group was able to produce the world's first foldable 65‐inch 8K OLED display panels with excellent light‐emitting characteristics using Panasonic inkjet equipment technologies (Figure 23). And also, we could jet ink which contained quantum dot (QD) materials and QD with titanium oxide 14 . So we will adapt our inkjet printing technologies for electro luminescence quantum dot and photo luminescent quantum dot display panels.…”

“…And also, we could jet ink which contained quantum dot (QD) materials and QD with titanium oxide. 14 So we will adapt our inkjet printing technologies for electro luminescence quantum dot and photo luminescent quantum dot display panels.…”

47.5‐inch 8K inkjet printing AMOLED monitor with local boosting gate driver on array design

“…In recent years, the fast growing market of high-end monitor (MNT) market has attracted increasingly interests. Various approaches including quantum dot (QD) color conversion, 1,2 white organic light emitting diode (WOLED), 3 and mini-LED (MLED) 4 are considered to fulfill the performance requirements. Among many promising self-emissive technologies, inkjet printing (IJP) has some attractive features such as lower material waste and simpler fabrication compared with vacuum-based OLED processes.…”