Active matrix QD‐LED with top emission structure by UV lithography for RGB patterning

Abstract

We have developed full colour top emitting quantum dot light‐emitting diode (QD‐LED) display driven by a 176‐ppi active matrix of metal oxide thin‐film transistors. Red, green and blue (RGB) QD‐LED subpixel emission layers are patterned by our original UV photolithography process and materials. We also demonstrate the potential to achieve high resolution such as 528 ppi using this process.

How Will Quantum Dots Enable Next‐Gen Display Technologies?

“…At Sharp Corporation, we have been developing a special photoresist and demonstrated a 6-inch fullcolor QD-LED display. 28 Most of the development results that we discussed show that QD-LEDs are at the stage where their basic performance as light-emitting devices has been confirmed at the research level, and further improvements are needed. So far, there has been no demonstration of a nontoxic QD-LED RGB display.…”

“…A full-color image displayed on a 6-inch QD-LED prototype achieved using photolithography. 28 material which reacts to UV light to form a matrix and make a pattern, or the alternative lift-off method where the photoresist is first patterned before the QDs are deposited. The photoresist pattern then is removed, leaving patterned QDs.…”

“…The photoresist pattern then is removed, leaving patterned QDs. For QD‐LED, both the lift‐off method 24 ‐ 26 and standard photolithography 27 , 28 method have been used. At Sharp Corporation, we have been developing a special photoresist and demonstrated a 6‐inch full‐color QD‐LED display 28 …”

Recent Progress of Quantum Dot‐Based Photonic Devices and Systems: A Comprehensive Review of Materials, Devices, and Applications

“…Furthermore, the QLED technology is now advanced for the large area multi‐color QD pixel array and high‐resolution displays. [ 154 ] Yang et al developed full‐color (red, green, and blue) QD‐based pattern arrays with 1400 pixels per inch for large‐area electroluminescence displays (Figure 4g–i). [ 137 ] QDs with ligand crosslinker, ethane‐1,2‐diyl bis(4‐azido‐2,3,5,6‐tetrafluorobenzoate), can be photo‐patterned upon UV exposure, resulting in chemically robust QD films after crosslinking.…”

64‐1: Invited Paper: Challenges for Realizing QD‐LED Display

“…They have the potential of high brightness, high contrast, high resolution, and to be made on rollable or flexible substrate with lower cost than OLED. We are engaged in this development 1 .…”