Samsung Display v. BOE Technology: OLED Patent Suit Dismissed Without Prejudice
Samsung Display filed a five-patent infringement action against BOE Technology and its Mianyang subsidiary in the Eastern District of Texas, targeting OLED pixel circuit and display driving technology. After 709 days of litigation, Samsung voluntarily dismissed the case without prejudice under Rule 41(a)(1)(A)(i), leaving the door open for future enforcement.
Samsung’s OLED Patent Offensive Against BOE Ends — For Now
On 26 June 2023, Samsung Display Co., Ltd. filed suit against BOE Technology Co., Ltd. and Mianyang BOE Optoelectronics Technology Co., Ltd. in the U.S. District Court for the Eastern District of Texas (Case No. 2:23-cv-00309). The complaint asserted five U.S. patents — US11594578B2, US7414599B2, US9818803B2, US10854683B2, and US9330593B2 — covering core OLED display technologies including pixel circuit driving methods, pixel arrangement structures, and stage circuits used in organic light emitting display devices.
After 709 days, Samsung Display filed a Notice of Voluntary Dismissal Without Prejudice pursuant to Federal Rule of Civil Procedure 41(a)(1)(A)(i). The Court accepted and acknowledged the Notice, formally dismissing all pending claims without prejudice. Each party was ordered to bear its own costs, expenses, and attorneys’ fees. Because the dismissal is without prejudice, Samsung retains the legal right to re-assert these patents in a future action, subject to applicable statutes of limitations and any intervening developments such as IPR proceedings.
A 709-day tenure before voluntary dismissal is notable: it suggests the parties engaged in substantive pre-trial activity before Samsung elected to withdraw. The public record does not disclose whether a confidential settlement was reached, whether licensing discussions are ongoing, or whether the dismissal reflects a strategic repositioning of Samsung’s enforcement posture. The without-prejudice nature of the dismissal is commercially significant — BOE cannot treat this closure as a permanent resolution, and the five asserted patents remain live enforcement tools.
Filing to Voluntary dismissal in 709 days
709 days — longer than the median E.D. Texas patent case before voluntary dismissal
Voluntarily dismissed: what the Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i): plaintiff-filed dismissal before answer
Under Federal Rule of Civil Procedure 41(a)(1)(A)(i), a plaintiff may dismiss an action without a court order by filing a notice before the opposing party serves an answer or a motion for summary judgment. This type of dismissal is self-executing — it takes effect upon filing. The court here accepted and acknowledged the notice, confirming the procedural validity of the exit. Crucially, the dismissal is without prejudice, meaning the claims are not adjudicated on the merits.
Rule 41(a)(1)(A)(i) exitThe dismissal is expressly without prejudice — a material distinction
A dismissal without prejudice leaves the door open for Samsung to re-file substantially the same claims. A dismissal with prejudice, by contrast, would bar re-litigation. The verdict text here is explicit: all claims are ‘DISMISSED WITHOUT PREJUDICE.’ This is not a final resolution on the merits. BOE cannot rely on this closure as a permanent shield against re-assertion of these five OLED patents, distinguishing this outcome from a settled or adjudicated case.
Claims may be re-filedBOE escapes judgment — but faces continued patent exposure
BOE Technology and Mianyang BOE Optoelectronics avoid any adverse judgment or injunction in this proceeding. Each party bears its own legal costs, so BOE receives no fee award. However, the without-prejudice character of the dismissal means BOE must continue to treat all five asserted Samsung patents as live enforcement risks. Any OLED products BOE brings to market in the U.S. should be assessed against US11594578B2 and the four co-asserted patents for as long as they remain in force.
No judgment; risk persistsOLED display IP rivalry between Samsung and BOE remains unresolved
Samsung Display and BOE are the world’s two largest OLED panel suppliers, competing intensely for smartphone and large-format display contracts. The withdrawal without prejudice — rather than a settlement with prejudice — suggests the competitive IP dynamic between them is unsettled. Companies sourcing OLED panels from BOE, or developing competing OLED pixel circuit technology, should note that Samsung’s five-patent portfolio remains available for re-deployment. The 709-day timeline also signals that Samsung was prepared to litigate seriously before exercising this exit.
IP rivalry ongoingFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Samsung Display Co., Ltd. | Company | Global OLED display manufacturer — holder of US11594578B2 and four further OLED patentsSearch in Eureka ↗ |
| Defendant | Boe Technology Co., Ltd. | Company | BOE Technology Co., Ltd. — major Chinese flat-panel display manufacturer and OLED competitorSearch in Eureka ↗ |
| Co-Defendant | Mianyang Boe Optoelectronics Technology Co., Ltd. | Company | Search in Eureka ↗ |
| Plaintiff counsel | Gregory Blake Thompson | Attorney | Counsel for Samsung Display Co., Ltd.Search in Eureka ↗ |
| Plaintiff law firm | Mann, Tindel & Thompson Attorneys at Law | Law Firm | Representing Samsung Display Co., Ltd.Search in Eureka ↗ |
| Defendant counsel | Cynthia D. Vreeland | Attorney | Counsel for Boe Technology Co., Ltd.Search in Eureka ↗ |
| Defendant law firm | Wilmer Cutler Pickering Hale & Dorr LLP – Boston | Law Firm | Representing Boe Technology Co., Ltd.Search in Eureka ↗ |
| Presiding judge | Judge N/A | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order adopts the precise language of Rule 41(a)(1)(A)(i), confirming a plaintiff-initiated, pre-answer dismissal requiring no judicial discretion to grant. The phrase ‘DISMISSED WITHOUT PREJUDICE’ is unambiguous: no merits determination was made, no claim was adjudicated, and the patents-in-suit retain their enforceability. The cost-bearing clause — each party covers its own fees — is standard for Rule 41(a)(1)(A)(i) exits and provides BOE with no compensatory relief. The order’s direction to deny all other pending relief as moot forecloses any outstanding motions, cleanly terminating this proceeding without creating any collateral estoppel or res judicata effect.
US11594578B2 — OLED pixel circuit driving and display architecture
The five asserted patents — US11594578B2, US7414599B2, US9818803B2, US10854683B2, and US9330593B2 — collectively protect foundational elements of OLED display panel design. They span pixel circuit driving methods for organic light emitting devices, pixel arrangement structures that determine display resolution and uniformity, and stage circuit architectures that govern row-by-row scan driving in OLED panels. Application dates range across multiple generations of Samsung Display’s R&D investment, suggesting the portfolio reflects an intentional layering of protection across successive OLED panel generations.
This patent cluster sits at the core of competitive differentiation in the OLED supply chain. Pixel circuit design and stage circuit architecture directly affect display efficiency, refresh rate, and manufacturing yield — parameters on which Samsung Display and BOE compete for premium smartphone and large-format panel contracts. A portfolio spanning driving methods, pixel arrangement, and scan stage circuits creates overlapping coverage that makes designing around any single patent insufficient. For companies developing OLED panels or integrating BOE-sourced displays into U.S.-bound products, this cluster represents a structured enforcement risk that predates any individual litigation cycle.
Should your team run an FTO against Samsung Display’s OLED patent cluster?
Any organisation designing, manufacturing, or importing OLED display panels — or products incorporating them — into the U.S. should assess freedom to operate against this five-patent cluster. The asserted patents cover pixel circuit driving methods, pixel arrangement structures, and stage circuit designs: technology present in virtually every active-matrix OLED panel. BOE-sourced panel integrators face particular exposure given Samsung’s demonstrated willingness to litigate in E.D. Texas, while independent OLED panel developers should evaluate whether their architectures fall within the claims of US11594578B2, US7414599B2, US9818803B2, US10854683B2, or US9330593B2 before U.S. product launch.
PatSnap Eureka’s FTO Search Agent enables R&D and IP teams to map their OLED pixel circuit and stage circuit designs against this patent cluster in a fraction of the time required for manual claim charting. Eureka identifies claim language relevant to specific circuit topologies, flags prior art that may limit enforceability, and surfaces related Samsung Display patents that could expand the risk perimeter — giving product teams actionable clearance data before commercialisation decisions are made.
Run a freedom-to-operate analysis on US11594578B2 to assess your product’s exposure
Run FTO in Eureka →Similar OLED display patent infringement cases in E.D. Texas
Explore comparable OLED and flat-panel display patent infringement actions filed in the Eastern District of Texas, including cases involving pixel circuit and driving method IP.
What this case signals for the OLED display IP landscape
Samsung’s tactical withdrawal keeps five foundational OLED patents live while signalling the limits of E.D. Texas enforcement against a well-resourced Chinese display maker.
Without-prejudice exit preserves Samsung’s enforcement leverage
By exiting under Rule 41(a)(1)(A)(i) without prejudice, Samsung retains the right to re-file on all five patents. This is a strategic pause, not a concession. Competitors and customers of BOE should treat this as a deferred risk rather than a resolved dispute — particularly given that the OLED pixel circuit patents at issue cover widely deployed display architectures.
BOE’s exposure in U.S. courts reflects growing Samsung enforcement activity
The filing of a five-patent suit in E.D. Texas — historically a plaintiff-friendly forum — suggests Samsung Display is building an enforcement record against BOE even if individual cases do not reach verdict. Display companies, panel integrators, and OEM brands sourcing from BOE should audit their supply chain against Samsung’s OLED portfolio, particularly patents covering pixel driving and stage circuit technology.
Samsung v Boe — key questions answered
The case was dismissed without prejudice. Samsung Display filed a Notice of Voluntary Dismissal under Rule 41(a)(1)(A)(i), and the court accepted it, formally dismissing all claims without prejudice. This means no merits determination was made and Samsung retains the right to re-assert the five asserted patents in future proceedings.
Samsung Display asserted five U.S. patents: US11594578B2, US7414599B2, US9818803B2, US10854683B2, and US9330593B2. The patents cover OLED pixel circuit driving methods, pixel arrangement structures for organic light emitting displays, and stage circuit architectures used in OLED panels.
The public record does not disclose Samsung’s reasons for dismissal. Possible explanations consistent with the record include confidential licensing or settlement discussions, a strategic decision to re-file in a different forum, or a reassessment of litigation posture ahead of claim construction. The without-prejudice nature of the dismissal suggests Samsung preserved its future enforcement options rather than conceding the dispute.
No. A voluntary dismissal without prejudice under Rule 41(a)(1)(A)(i) has no effect on patent validity. The court made no merits ruling. All five asserted patents — US11594578B2, US7414599B2, US9818803B2, US10854683B2, and US9330593B2 — remain in force and are available for re-assertion by Samsung Display.
The court ordered each party to bear its own costs, expenses, and attorneys’ fees. BOE Technology received no fee award. This is the standard outcome for a Rule 41(a)(1)(A)(i) voluntary dismissal filed before the opposing party has answered, and it means neither party can recover litigation costs from this proceeding.
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