Fully-integrated active matrix programmable UV and blue micro-LED display system-on-panel (SoP)

Abstract

High pixel per inch and high‐resolution micro‐LED displays are attracting more and more attentions. The increasing pixel number requires a large amount of bonding pads and brings huge difficulties to micro‐LED system design and lowers power efficiency as well. It is urgent to integrate row and column driving circuits onto the micro‐LED panel. Here, we report a fully integrated active matrix programmable micro‐LED system on panel (SoP) with ultraviolet and blue emission wavelengths. The micro‐LED SoP has a resolution of 60 × 60 and pixel pitch of 70 μm. The micro‐LED SoP was achieved by integrating micro‐LED arrays with silicon‐based p‐channel metal‐oxide semiconductor driving panel using fine‐toned flip‐chip bonding technology. With fully integrated scan and data circuits, the number of bonding pads was greatly reduced from 136 to 28, and large amount of metal interconnection lines were saved. The micro‐LED SoP panel was mounted on a periphery driving board, and representative characters were displayed successfully.

Efficient radical-based light-emitting diodes with doublet emission

“…Organic light-emitting diodes (OLEDs), 1-5 quantum-dot-based LEDs (QLEDs), [6][7][8][9][10] perovskites-based LEDs [11][12][13] and micro-LEDs 14,15 are in competition to provide the basis for next-generation displays and active lighting, all offering attractive prospects for lightweight and flexible units. Here we demonstrate efficient operation of radical-based OLEDs, 16 in which the emission comes from a spin doublet rather than a singlet or triplet exciton.…”

Investigation of Electrical Properties and Reliability of GaN-Based Micro-LEDs

“…In Figure 6, the leakage current increase is about 25%, and the forward current and the slope have the largest increase at more than 70%. The performance of each of our devices is compared with those from other groups [22][23][24][25][26][27][28][29] in Table 2. The applied bias of the devices is 5 V, which is typically reported.…”

32‐1: Invited Paper: Review of Micro‐light‐emitting‐diode Technology for Micro‐display Applications

“…Among the technologies to implement a micro-display, the μLED technology was compared to two of them, the OLED and the LCD which are available in the market at present, in Table 1 [2,3,4,5]. Basically, the μLED, together with the OLED, is selfemissive, but the LCD requires a backlight and color filters for a display.…”