Foldable Display Emissive Layer Patents: Leaders & White Space 2026
- Filing has already peaked. The corpus tops out at 4 filings in 2019 and sits flat-to-declining through the 2022 midpoint, with 2026 activity not yet visible due to publication lag.
- Every record routes through the US. All 12 published families in this dataset are US receiving-office filings, with no visible parallel filing elsewhere in the corpus.
- Citations concentrate on two documents. US20190340959A1 (54 citations) and US20200212326A1 (15 citations) carry most of the influence in this set; the rest cluster in single digits.
What this landscape covers
This dataset isolates patent families at the intersection of foldable and rollable display mechanics and the emissive stack itself — phosphorescent emitters, tandem emission architectures and flexible OLED emitter layers — rather than the broader foldable-device category. The search string ties title/abstract mentions of foldable or rollable displays to claim-level language on emissive layers and tandem stacks, filtered to the H10K50/11, H10K85 and H10K59/12 IPC groups that cover organic light-emitting structures.
The result is a small, tightly scoped corpus: 12 published families, all routed through the US patent office, spanning 2015 through the 2026 data cut-off. That size matters for how the findings should be read — this is a niche within OLED patenting, not the whole foldable-display field, and the numbers below should be treated as a close-up on emissive-layer claims specifically.
Filing trend and technology composition
Two views of the same 12-family corpus: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
A peak already behind it
Filings rose to a peak of 4 in 2019, then eased back; the 2022 midpoint sits at 2, and the trend line through to 2026 is flat or declining. Because publication typically lags filing by around 18 months, the most recent one to two years in this chart will read lower than the true filing rate — but even allowing for that lag, there is no sign of a renewed filing wave inside this corpus.
Concentrated in H10K, but reaching wide
Every one of the 12 families touches H10K (organic semiconductors), and most also carry G09F (displaying, advertising & signs) and G06F (digital data processing) codes — a signature of claims that describe the emissive layer inside a working foldable device rather than the emitter chemistry in isolation. H01L appears in 9 of 12, and G02F (optical control) in 5, with single mentions of H02K, E06B and F16H marking occasional mechanical-hinge or shutter crossover claims.
Shares are the percentage of the 12 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Foldable Display Emissive Layer with Eureka
This page is one run against one query. Ask Eureka your own question about foldable display emissive layer and every answer comes back with the patent numbers behind it.
Try EurekaThe documents carrying the most weight
Foldable display device (US11232722B2, Samsung Display)
The patent describes a foldable display device built from a lower module, a display module, a functional module and a window module stacked in sequence. Its distinguishing structure is an inorganic-inorganic contact closed loop, formed where a lower and an upper inorganic encapsulation layer meet directly to surround the display area, with the upper encapsulation structure built from at least three layers.Number, assignee and filing date are rendered from the underlying record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20190340959A1 | Foldable display device and method of manufacturing foldable display device | 54 |
| 2 | US20200212326A1 | Display device | 15 |
| 3 | US20250172970A1 | Foldable display device and method of manufacturing foldable display device | 4 |
| 4 | US11615721B2 | Foldable display device | 4 |
| 5 | US20220093015A1 | Foldable display device | 4 |
| 6 | US11480241B2 | Display device | 4 |
| 7 | US11232722B2 | Foldable display device | 4 |
| 8 | US20200388197A1 | Foldable display device and method of manufacturing foldable display device | 2 |
| 9 | US20230306878A1 | Foldable display device and method of manufacturing foldable display device | 1 |
| 10 | US11688308B2 | Foldable display device and method of manufacturing foldable display device | 1 |
Citation counts are drawn from the searched corpus itself and favour older filings; treat them as a measure of influence on later claims, not as a ranking of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the filing pattern signals
Three read-outs from a small, US-centric corpus that has already passed its filing peak.
A single cycle, not sustained growth
Activity climbed to 4 filings in 2019 and has not returned to that level since, with the 2022 midpoint at 2. That pattern reads as one filing cycle tied to early foldable-device commercialisation, rather than an ongoing race to claim emissive-layer territory.
No visible filing outside the US in this set
Every published family in this corpus lists the US as receiving office. That does not mean the underlying technology is US-only, but it does mean this dataset cannot speak to parallel CN, KR or EP filing strategy for the same emissive-stack claims.
Influence sits with two early documents
US20190340959A1 and US20200212326A1 account for the bulk of citation weight in this corpus; the remaining most-cited records sit at 4 citations each. New entrants should expect to be measured against those two documents first.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to foldable display emissive layer, with the prior art for and against each one.
Who is active, and where the claim space is thin
The ranking that accompanies this section is built from all 12 families; the read below explains what the momentum figures mean rather than repeating the list.
Leading assignee has gone quiet in-year
Samsung Display shows 0 filings in the latest tracked year, a -100% year-on-year change from its prior activity. Combined with the corpus-wide flat trend, that suggests the current wave of emissive-layer claims from this filer has already been lodged rather than being in progress.
Second major filer shows the same pattern
LG Display's latest-year count also reads as 0, mirroring the pause seen elsewhere in the corpus. With only 12 families total, a handful of new filings from either firm would meaningfully shift the ranking.
A small field, easy to monitor in full
With just 12 patent families in the ranking, this is not a crowded space in absolute terms. Concentration at the top means a new filer's first application in emissive-layer claim language is competing against a short, well-defined set of prior documents rather than a sprawling one.
| Assignee | Recent year | YoY |
|---|---|---|
| Samsung Display Co., Ltd. | 0 | -100% |
| LG Display Co., Ltd. | 0 | — |
Where to take this
This landscape is a starting point for scoping, not a substitute for a full freedom-to-operate search.
Check the under-claimed branches directly
The IPC crossover with G02F, E06B and F16H marks areas this corpus touches only lightly. Run a targeted search on those specific combinations before assuming they are open.
Explore in Eureka →Track the two quiet leaders
Samsung Display and LG Display both show 0 filings in the latest tracked year after prior activity. A change in either company's filing rate is the clearest early signal this space is reheating.
Set up monitoring in Eureka →Questions practitioners ask about this space
In this dataset, the emissive layer refers to the light-emitting portion of the OLED stack — phosphorescent emitters, tandem emission architectures, or flexible OLED emitter layers specifically claimed in the context of a foldable or rollable display. Claims are filtered to IPC groups H10K50/11, H10K85 and H10K59/12, which cover organic light-emitting device structures rather than the broader display module, hinge or encapsulation hardware around it. A patent that only mentions foldability in passing, without claim-level language on the emissive stack, falls outside this scope.
Yes, based on this corpus. Filings peaked at 4 in 2019, dropped to a midpoint of 2 by 2022, and the overall trend through the 2026 data cut-off reads flat or declining. Publication typically lags filing by around 18 months, so the most recent one to two years will always look thinner than the true filing rate, but even accounting for that lag there is no sign of renewed acceleration inside this specific emissive-layer scope.
Samsung Display and LG Display are the two named assignees with tracked recent-year momentum in this corpus, though both show 0 filings in the latest year, a -100% year-on-year change for Samsung Display specifically. With only 12 total families in the ranking, the field is small enough that a new filer's activity could shift the standings quickly. The most-cited underlying documents, US20190340959A1 and US20200212326A1, are useful reference points regardless of which assignee is currently most active.
The IPC composition points to several branches that appear only at the margins of this corpus: hinge-integrated encapsulation approaches (E06B crossover), tandem-stack pairing with driver circuitry (G06F overlap), optical-modulation layer pairing (G02F crossover), and gearing-assisted rollable mechanisms (F16H crossover). Each of these shows up in only one or a handful of the 12 records, which suggests claim language there is thinner than in the core H10K/G09F emissive-and-display combination. A freedom-to-operate search focused on these specific crossovers is the practical next step before filing.
Not directly. All 12 published families in this dataset list the United States as the receiving office, so the corpus cannot speak to parallel filing strategy in China, Korea, Europe or elsewhere for the same emissive-layer claim language. Given that Samsung Display and LG Display are both Korean firms, it is likely that related filings exist in other jurisdictions; a separate search scoped to those offices would be needed to confirm coverage there.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.