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Samsung · Display · Filed Dec 29, 2025 · USPTO published May 14, 2026 · May 14 release

Samsung Display Patents a Dual-Zone Active Layer for Brighter, More Efficient LEDs

Samsung Display is rethinking what happens inside the light-emitting heart of an LED. By splitting the active layer into two chemically distinct zones, the company is trying to squeeze more light out of the same tiny chip.

By · Updated · 3 min read

Samsung Display Patent: Dual-Zone LED Active Layer, figure from US 2026/0136715 A1
Figure from the official USPTO publication.
Publication number
US 2026/0136715 A1(US20260136715A1)
Applicant
Samsung Display Co., Ltd.
Filed · Published
Dec 29, 2025 · May 14, 2026
Inventors
Seung A LEE, Hoo Keun PARK, Young Jin SONG
Status when we published
Waiting for an examiner
Document
14 claims
US classification
257/79
Parent application
Continuation of 17/543,297 (filed Dec 6, 2021)(17543297)

What Samsung's two-zone LED structure actually does

Imagine a tiny LED as a sandwich. The middle layer — called the active layer — is where electricity turns into light. Normally that middle layer is pretty uniform. Samsung's patent describes splitting it into two separate zones, each tuned to emit light slightly differently.

The key trick is that the two zones have different band gaps — essentially, different energy levels that determine what color and how efficiently light is produced. The zone with the narrower band gap (meaning it takes less energy to emit a photon) is positioned closer to one side of the sandwich, at a very specific distance from the outer layers.

By carefully controlling where each zone sits and how much of the band-gap-determining chemical each zone contains, Samsung is aiming for LEDs that are more efficient and potentially more color-accurate — exactly the kind of incremental improvement that quietly makes next-generation displays look noticeably better.

How the band-gap zones are positioned inside the LED

The patent describes an LED structure built on a substrate with three core layers: an N-type semiconductor on one side, a P-type semiconductor on the other, and an active layer sandwiched between them. The active layer is where electron-hole recombination happens and light is emitted.

The innovation is dividing that active layer into a first active area and a second active area, each containing a different well layer with a different band gap (the energy threshold that determines how photons are generated — a narrower band gap means lower-energy, longer-wavelength light and typically higher recombination efficiency at lower voltages). The second active area has the smaller band gap and sits closer to the P-type layer.

Positioning is tightly specified in the claim:

  • The second active area must be at least 10% of the total semiconductor distance away from the P-type layer
  • Its distance from the N-type layer is 0.2–0.35× the active layer height
  • Its distance from the P-type layer is 0.2–0.25× the active layer height

The first active area is further subdivided into a (1-1)th area directly adjacent to the N-type layer and a (1-2)th area directly adjacent to the P-type layer — effectively wrapping around the second active area. This geometry controls where carriers (electrons and holes) recombine, steering them toward the higher-efficiency zone.

What this means for next-gen Samsung display panels

For display makers, LED efficiency is a constant arms race. Brighter panels with lower power draw — think thinner phones with longer battery life, or AR glasses that don't overheat — depend on squeezing every photon out of each LED chip. Micro-LED displays, which Samsung is actively developing as a successor to OLED, are especially sensitive to active-layer design because each pixel is its own tiny LED.

This patent suggests Samsung is doing serious materials engineering work at the atomic level to optimize how charge carriers move and recombine. The very specific distance ratios in the claim (0.2–0.35×, 0.2–0.25×) indicate this isn't a broad conceptual filing — it's rooted in empirical testing, which is usually a sign the company has working prototypes.

Source: US 2026/0136715 A1 at the USPTO (PDF). Full patent text and figures are in the official publication.

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