A session at this year’s Display Week Business Conference made clear that microLED is no longer a technology talked about only in research labs — but that the gap between proof-of-concept and mass-market reality remains stubbornly wide. Moderated by Nag Patibandla, Vice President at Applied Materials, the panel brought together some of the most hands-on practitioners in the field:

• Ralph Polshek, Display Technology Manager at Garmin
• Charles Lee, CEO of PlayNitride
• Jung Moo from Samsung Display, who leads both their microLED and overall display business

The result was a candid, technically grounded discussion that ranged from sub-micron sidewall passivation challenges to the right tile size for a modular large-format display.

Patibandla opened by drawing a sharp distinction between two very different classes of microLED product: near-eye microdisplays for AR and MR applications, and direct-view displays — wearables, smartphones, laptops, and large-format signage. “For near-eye displays like the AR displays that Jason was talking about, and what we call direct-view displays,” he said, the requirements diverge so dramatically that they arguably represent separate industries sharing a common emitter technology. Nowhere is that divergence more stark than in pixel density: a conventional smartphone packs roughly five million pixels into around 20 square inches, while an AR waveguide-coupled microdisplay engine needs 10 million pixels into a quarter of a square inch. That is not a scaling problem, Patibandla noted — it is a fundamentally different manufacturing paradigm. “We should try and charge the AR guys by pixel, not by area.”

Garmin’s First-Mover Reality Check

Polshek provided the panel’s most concrete commercial data point. Garmin’s microLED smartwatch — described as the world’s first commercially available microLED-based consumer wearable — incorporates a display capable of exceeding 4,500 nits peak luminance with what Polshek characterized as true wide viewing angle and wide color gamut rivaling AMOLED. The watch contains more than 400,000 discrete inorganic LED emitters in a direct-emission, passive-matrix-equivalent array driven by dedicated driver ICs. Those performance credentials are real. The trade-offs are equally real.

“It’s pretty expensive. It does not match the power of OLED. It’s going to take a while for this technology to do that,” Polshek acknowledged. The device currently lacks integrated touch, making the module thicker than Garmin’s OLED-based equivalents. On power consumption, the numbers were striking: Polshek’s own unit achieves approximately two weeks between charges, while the comparable OLED variant runs roughly four weeks. That roughly 2× power penalty is a direct consequence of three compounding factors:

• The LED emitters’ wall-plug efficiency at display-relevant current densities
• The limited ecosystem of microLED-specific driver ICs
• The lack of the ultra-low-luminance optimization that current OLED LTPS backplane designs enable.

For Polshek, the implications reduce to three tests that any display technology must pass to move from niche to mainstream. “First and foremost, it has to have power parity with other technologies today — it isn’t there. Cost — it’s got to be at cost parity or better than current technologies — it’s not there. And manufacturing scalability — it’s got to be able to do all various sizes, all various formats, pixel pitches.” Until microLED checks all three boxes, he argued, it will remain an enthusiast product rather than a volume platform.

He also drew attention to a display-quality threshold that will separate successful microLED panels from failed ones: defect density. “On a microLED display, a stuck-on pixel makes an LCD stuck pixel look like nothing — it’s literally a flashlight.” With over 400,000 emitters per panel, the yield and repair requirements are categorically more demanding than any prior thin-film display technology.

PlayNitride’s Historical Acceleration — and Honest Reckoning on Cost

Charles Lee traced PlayNitride’s development arc from 2016, when the company demonstrated a handful of illuminated LEDs, to 2025, when commercial microLED smartwatch products appeared alongside first demonstrations of microLED-based AR glasses engines. The pace is genuinely remarkable: a 100-inch-class microLED TV entered production just seven years after the first emitter array. “Please think about it — from just 2016 to 2025 it’s really, really, really fast evolution for microLED display technology,” Lee said.

The underlying logic, he explained, is that microLED as a technology is a combination of two already-mature fields — compound semiconductor LED fabrication and flat-panel display backend processing. The challenge is not in understanding either domain individually, but in marrying them. Mass transfer — the process of picking and placing millions of 10–15 micron chips from a source wafer to a display backplane — was the pivotal process innovation. PlayNitride developed its chip-on-carrier (COC) technology specifically to make this tractable at production volumes, progressively evolving from COC1 to COC2 architectures with improving throughput and reduced misplacement rates.

Mass repair — rather than perfect-yield, single-pass transfer — became the pragmatic solution to the near-impossibility of achieving the six-nines (99.9999%) first-pass yield that a defect-free panel requires.

On the cost question, Lee was candid. “I think the cost gap is shrinking right now,” he said, but he acknowledged this remains the technology’s primary unresolved commercial challenge. Crucially, he argued that the solution is not technical isolation but ecosystem build-out: “We cannot just be the only company in the world able to manufacture the very small size microLEDs. We started to transfer our technology to partners… and we believe that’s one of the reasons today we see the cost and prices reduced much faster than previously.”

He also addressed the efficiency-versus-size challenge directly. Sidewall surface recombination — the dominant loss mechanism as emitter lateral dimensions shrink below roughly 20 microns — is being managed through sidewall passivation, though not yet eliminated. At the 10–15 micron node, Lee contended, the practical impact on system cost is manageable: more than 25 million chips can be produced on a six-inch GaN-on-sapphire wafer at those dimensions, keeping the per-emitter cost within a commercially viable range. “I don’t treat that as a roadblock for reducing the cost compared to what we have today.”

Samsung Display: The AMOLED Parallel and the Honest Admission

Jung Moo brought a distinctive historical perspective, having spent the early part of his career at Samsung developing AMOLED at a time when LCD was the unchallenged volume technology. “We joking called AMOLED the ‘amor’ means in Korean ‘gloomy and dark’ — so we called it the gloomy display.” That technology went on to define the smartphone era. He sees a direct parallel with microLED’s current position.

Samsung’s strategic framework for microLED commercialization is explicit: enter at the smallest, most technically tractable form factor — watch-sized direct-view displays — and scale upward as process maturity improves. For the current generation, Samsung identifies three critical barriers: characteristic performance (particularly luminous efficacy at display-relevant current densities), manufacturing throughput, and cost.

On efficiency, Jung Moo was unusually frank. “Five years ago I felt the same — everybody told me that LED is a next-generation display with high efficiency. I realized that it’s not.” The core physics problem is that LED external quantum efficiency (EQE) degrades with both decreasing emitter size and decreasing drive current — a dual penalty that directly contradicts the operating conditions a high-dynamic-range display requires. Blue and green III-V nitride emitters, he noted, are approaching or exceeding AMOLED-equivalent efficiency in some operating regimes. Red is the persistent problem: AlInGaP-based red microLEDs suffer the most severe size-related efficiency rolloff, and no manufacturable alternative has yet closed the gap. “Blue is better, green is somewhat, and red is a problem.”

For manufacturing, Samsung’s focus is on bonding process speed — specifically the throughput of the LED-to-backplane integration step — and on developing inspection and repair systems capable of operating at the speeds required for commercial volume. “We still need maybe two or three times the higher speed,” Jung Moo said of current repair throughput. The interposer architecture, which stitches multiple smaller panels into large-format displays, was discussed as one approach to improving productivity: moving from 10-inch to 30-inch interposer substrates would substantially improve the economics of large-area assembly, though he noted the bonding process — which requires elevated temperature and pressure across the full substrate area — imposes practical limits on how far that dimension can be pushed.

Areas of Agreement: The Three-Pillar Framework

Despite representing very different positions in the supply chain — OEM system integrator, display manufacturer, and panel maker — all three panelists converged on the same fundamental framework. MicroLED’s path to mainstream adoption requires simultaneous progress on power consumption (or more precisely, luminous efficacy at the system level), manufacturing cost, and production scalability. None of these is close to resolved today. All three are improving. The question is velocity.

There was also broad consensus on market sequencing. Wearables and compact direct-view devices are the logical entry point, both because their small emissive area reduces the absolute chip count and transfer challenge, and because the premium consumers are willing to pay for superior brightness, wide viewing angle, and burn-in immunity exists in that segment today. AR microdisplays are a separate but equally compelling entry point, where microLED’s combination of high peak luminance (essential for daylight-readable see-through AR), small physical footprint, and inorganic emitter longevity give it advantages no competing technology can fully match. Large-format direct-view displays — TVs and architectural installations — and mobile handsets are broadly seen as longer-horizon targets where cost reduction must substantially advance before volume penetration is realistic.

Areas of Contention: Timeline and Priority

The sharpest disagreement of the session concerned timeline expectations. An audience member reminded Charles Lee that years ago he had predicted cost-competitive 65-inch 4K microLED TVs by 2020. Those products exist today — but at prices of $200,000–$300,000, not $2,000. Asked when the industry would see a microLED product capable of selling one million units per year, Lee was measured but honest: the key variable is not the core LED or transfer technology, but ecosystem depth. “We really need to work with partners, customers, the entire supply chain. One of the reasons is not so many players today jumping in and joining — one of the reasons is the difficulties of making microLEDs.”

Polshek, drawing on 36 years in the display industry, offered the most sobering benchmark. OLED, now the undisputed standard for premium mobile displays, took roughly 25 years from its first commercial appearance — a single-color Philips Norelco razor display — to mainstream adoption. “We’re in the first 25% of that development. Micro LED still has a way to go to become mainstream. I believe it’ll get there faster — but it takes time.”

There was also implicit tension around the relative priority of near-eye versus direct-view development. Lee, speaking as both engineer and CEO, said that technically the more interesting and challenging problems are in microdisplay for AR — the pixel pitch, luminance, and integration requirements are simply more demanding. “Technology-wise, I would focus more on the microdisplay, because they have much more work to do.” But commercially, he acknowledged, the near-term revenue opportunity lies in the direct-view market — watches, TVs, automotive. “As CEO of the company, we need to focus on both, but with different aspects.”

Implications for the AR Glasses Supply Chain

For the AR/MR display engine community, the panel’s discussion carries specific and significant implications.

The luminance requirement is non-negotiable and microLED is the only credible path to meeting it at reasonable power budgets. A see-through AR waveguide display typically requires 1,000,000 nits or more from its illumination engine to deliver an acceptable apparent image luminance through the combiner in daylight conditions. No OLED or LCD-based light engine can approach that figure at the emitter areas and power envelopes relevant to a wearable device. MicroLED’s claimed advantage in this dimension is confirmed by the panelists as real — even the first-generation smartwatch display achieves 4,500 nits at direct-view distances — but scaling that to microdisplay dimensions while maintaining EQE and managing thermal load at the die level remains an active engineering challenge.

The pixel density challenge is fundamentally different from the direct-view case, as Patibandla’s “charge by pixel, not by area” framing illustrated. A near-eye microdisplay engine for AR glasses may require 10 million pixels in under 0.25 square inches — a pixel pitch below 3 microns for a 0.3-inch diagonal panel. At those dimensions, sidewall recombination is a serious efficiency penalty and mass transfer throughput per unit area becomes a significant cost driver. The panel did not resolve these challenges, but Lee’s comments on passivation and the six-inch wafer yield data suggest the industry is not starting from zero.

Red efficiency remains the single most consequential unsolved problem for full-color AR applications. Both Lee and Jung Moo acknowledged that blue and green InGaN emitters are approaching or exceeding OLED-equivalent performance in laboratory conditions, but red AlInGaP microLEDs have not. Color-converted approaches — using blue or violet microLEDs with quantum dot or phosphor downconversion for red and green — offer one route around this, at some cost in luminance and resolution. The panel did not address this tradeoff explicitly, but it sits beneath several of the efficiency discussions.

Driver IC availability — flagged by Polshek as a current production bottleneck — is equally critical for AR applications. A microdisplay-class microLED panel requires a custom CMOS silicon backplane with per-pixel current sources capable of driving individual emitters at the very low absolute currents that a high-pixel-density, power-constrained design implies. The LTPS TFT backplane approaches used in current direct-view microLED displays are not suitable at microdisplay pixel pitches; silicon CMOS backplanes with pixel pitches below 3 microns are a specialized semiconductor product. The panel’s discussion of expanded driver IC roadmaps and the need for the “display people to think about displays without the area in mind” underscores that the supply chain for AR-class microLED displays is still being built.

Implications for Display Manufacturers

For panel makers and OEM integrators, the panel’s consensus around a “crawl, walk, run” commercialization sequence has direct strategic implications.

Manufacturing investment should prioritize flexibility over scale in the near term. Jung Moo’s observation that a company must be able to serve watch, automotive, and TV applications from a common process platform — adjusting recipe and application-specific device structure rather than duplicating capital equipment — reflects the economic reality of a market still too fragmented to justify application-specific lines. The mass transfer and backend PEP (panel edge preparation) tooling investments should be designed to accommodate the parameter range across these segments.

The interposer-based tiling architecture for large-format displays remains the most practical path to any large panel until single-substrate transfer yields improve dramatically. Samsung’s analysis suggests a 30-inch interposer may be achievable in the medium term, but the bonding process constraints — temperature, pressure, and planarity uniformity — are real limits rather than targets. The modular tiled approach pioneered in signage products (including Samsung’s own “The Wall”) is essentially the bridge architecture until those limits are lifted.

Ecosystem development — particularly the expansion of the supply base for microLED chips, mass transfer tooling, and driver ICs — emerged from the discussion as arguably more important than any single firm’s internal technology improvement. Lee’s decision to license PlayNitride’s mass transfer technology to partners was explicitly framed as a strategic choice to build the cost reduction curve rather than protect IP. Display manufacturers watching that cost curve will want to track the breadth of the supply ecosystem, not just the leading-edge specifications of individual players.

Finally, for manufacturers already committed to AMOLED, Jung Moo’s framing of microLED as a long-cycle technology investment — analogous to the multi-decade AMOLED development effort — suggests that dual-track development is the likely posture for large, integrated display companies. AMOLED will not be displaced quickly. But the companies that begin building microLED process knowledge and supply chain relationships now will be better positioned when the cost and efficiency crossover points arrive.

As Polshek put it: “The display is the face of the product. If the display is great, the consumer might mention it. But if the display is bad, oh my gosh, they really come down on it.” The microLED industry has demonstrated it can make a great display. The challenge now is making millions of them, at a price people will pay.