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QuantumDots and microLEDs: Selected Technology Highlights by TechBlick

This is an article by TechBlick, organizers of the upcoming QuantumDots Displays virtual event. QuantumDots-Info readers get a 100 Euro discount.

In this article, using select technology slides, we highlight several interesting advancements in MicroLED and/or QD displays. More specifically, we cover 3600PPI “Silicon” Displays | Gravure printed microbumps | Electrohydrodynamically printed QD color converters | Laser LLO and Transfer for MicroLEDs | QD vs Phosphors | Energy saving credentials of microLED

“Silicon” Displays with an incredible 3600ppi full color using microLED and QD technology?

Sharp (HIRANO Yasuakie et al) has developed this technology.

As shown in the slide below, first blue-only uLEDs are formed on a sapphire substrate. Here, one LED array contains 352 x 198 micro LED dies of 24 um x 8 um in size. In parallel, an LSI chip containing the driving circuitry is formed on a silicon wafer. Here, the cathode (N-type electrode) and anode (P-type electrode) are fabricated for each micro LED die to apply driving voltage independently to each die. The Au bump electrodes are fabricated in accordance with the pitch of the LED dies. The two substrates are flip-chip bonded using Au-Au bonding. Here one can already see the parallel to the silicon and optoelectronic industry (vs. the traditional thin film display industry!). Next, the sapphire layer is removed via laser lift off. Finally, Cd-free quantum dots (green and red) are deposited atop the microLED dies to enable R G color conversion. This way one achieves RGB colors

The device architecture is shown in slide 2- here one can see the location of GaN uLED dies, Au bumps, as well as light shielding walls and quantum dots (QDs). This way, a full color 1,053 ppi display is formed.

Read the full story Posted: Sep 21,2022

Samsung Display to increase QD-OLED production capacity and introduce new panel sizes

Samsung Display has recently demonstrated a new 77-inch QD-OLED panel, and the company says it will introduce both 77-inch and 49-inch QD-OLED displays next year.

77-inch QD-OLED panel prototype (SDC)

SDC is also planning to increase its monthly capacity from around 30,000 substrates (8.5-Gen) to almost 40,000 substrates. This will be achieved by a decreased TAKT time. Together with improved yields, SDC will increase its production capacity by 30% by next year.

Read the full story Posted: Aug 27,2022

Sony's A95K QD-OLED TV wins the Value Electronics 2022 4K TV shootout

US-based A/V retailer Value Electronics conducted its latest annual TV shootout. In the 4K category, the company tested 5 TVs, including an OLED TV, two miniLED QD LCDs and the two QD-OLED TVs on the market.

Value Electronics 2022 TV shootout photo

The winner of this year's shootout was Sony's A95K QD-OLED, which received the top marks in all categories. The runner up was Samsung's own S95B QD-OLED, which uses the same SDC panel. This is a great testimonial to Samsung's QD-OLED panel performance.

Read the full story Posted: Aug 05,2022

Leyard says it is ready to mass produce microLED displays with quantum dots color conversion technology

China-based Leyard Optoelectronics says it is starting to produce microLED large-area displays that use blue microLEDs and QD based color convestion.

Leyars uses Saphlu'x NPQD technology (it is a stakeholder in Saphlux), which makes use of a nanopore structure to deposit the quantum dots on blue microLED chips. Saphlux says that the nanoporous structure has a unique scattering effect, which enhances light conversion efficiency and the reliability of the quantum dots. The solution also provides a wide color gamut, good color consistency and high efficiency.

Read the full story Posted: Jul 31,2022

DSCC sees the QD-OLED TV market growing from 500,000 units in 2022 to 1.5 million units in 2026

DSCC says that over 500,000 QD-OLED TVs will ship in 2022, offered by both Sony and Samsung. Shipments are expected to grow and reach 1.5 million units in 2026.

QD-OLED TV shipments, 2022-2026, DSCC

The main limitation for QD-OLED TVs will by Samsung's production capacity. In 2023 the company will add 49-inch monitors and 77-inch TV panels, as SDC will start using Multi-cut Mother Glass (MMG) technology.

Read the full story Posted: Jul 19,2022

Newly-developed perovskite QDs are promising for display color conversion applications

Researchers from the Beijing Institute of Technology and MIIT have developed perovskite quantum dots microarrays with strong potential for quantum dots color conversion (QDCC) display applications.


Perovskite quantum dots microarrays with strong potential for QDCC applications, including photonics integration, micro-LEDs, and near-field displays. Image from Nano Research

Perovskite quantum dots (PQDs) hold potential as an attractive material and can resolve some of the problems found in conventional QDCC. While perovskite quantum dots are relatively new, they have already been shown to have attractive properties that make them extremely suited for electronic and optoelectronic applications.

Read the full story Posted: Jun 11,2022