Bishop Display Tech v. Heesung Electronics: Six TFT-LCD Patents, Dismissed Without Prejudice
Bishop Display Tech, LLC filed suit in the Eastern District of Texas against South Korean display manufacturer Heesung Electronics, Ltd., asserting six US patents covering thin-film transistor liquid crystal display technology. After 418 days of litigation, both parties jointly moved to dismiss all claims and counterclaims without prejudice.
Six TFT-LCD Patents, One Stipulated Exit: Reading the Bishop Display Settlement
On February 8, 2024, Bishop Display Tech, LLC filed suit against Heesung Electronics, Ltd. in the Eastern District of Texas (Case No. 2:24-cv-00086) before Judge Rodney Gilstrap, one of the most experienced patent trial judges in the country. The complaint asserted six US patents — US6787829B2, US6850303B2, US6906769B2, US6801293B1, US6816208B2, and US6525798B1 — all directed at TFT-LCD technology and liquid crystal modules incorporated into Heesung’s display products.
The case closed on April 1, 2025, when Judge Gilstrap granted the parties’ Stipulated Motion for Dismissal Without Prejudice (Dkt. No. 49). Both plaintiff’s infringement claims and defendant’s counterclaims and affirmative defenses were dismissed without prejudice, meaning no merits adjudication occurred and the public record does not reflect any confirmed settlement payment, license, or other commercial arrangement between the parties.
At 418 days, the case ran long enough to suggest meaningful discovery or claim construction activity before resolution. The joint, stipulated nature of the dismissal — without prejudice on both sides — is consistent with a negotiated commercial resolution, though the public record is silent on specific terms. The without-prejudice designation leaves Bishop Display Tech free to refile on the same patents, preserving optionality that a with-prejudice dismissal would have foreclosed.
Filing to Dismissed without Prejudice in 418 days
418 days — above the E.D. Texas median for stipulated patent dismissals
Dismissed without prejudice: what the stipulated order means for both parties
Stipulated dismissal without prejudice under Fed. R. Civ. P. 41
A stipulated dismissal without prejudice means both parties jointly agreed to end the litigation and the court entered no judgment on the merits. Under Rule 41, dismissal without prejudice does not bar the plaintiff from refiling the same claims. The court’s role was limited to granting the agreed motion — it made no ruling on patent validity, infringement, or claim scope.
No merits adjudicationBishop Display retains full refiling rights on all six patents
Because the dismissal is without prejudice, Bishop Display Tech preserves the right to reassert all six TFT-LCD patents against Heesung or any other defendant. No adverse validity or infringement ruling was entered. The patents remain fully enforceable. This outcome is consistent with a confidential licence or commercial resolution, though the public record does not confirm any such arrangement.
Patents remain enforceableHeesung’s counterclaims also dismissed — no invalidity ruling obtained
Heesung Electronics secured dismissal of all plaintiff claims but did not obtain a declaration of patent invalidity or non-infringement. Its own counterclaims and affirmative defenses were similarly dismissed without prejudice, meaning no court ruling shields it from a future assertion of the same patents. The absence of a with-prejudice dismissal or consent judgment limits Heesung’s defensive posture going forward.
No invalidity findingSix live TFT-LCD patents remain an active licensing risk for the display sector
The without-prejudice exit leaves six patents covering core TFT-LCD and LCM technology available for future enforcement. Any display panel manufacturer, module integrator, or OEM sourcing Heesung-compatible components should treat these patents as live licensing risk. The Bishop Display portfolio’s survival of this litigation — without any narrowing claim construction ruling entering the public record — strengthens its licensing leverage in future negotiations.
Active licensing riskFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Bishop Display Tech, LLC | Company | Patent assertion entity — holder of six US TFT-LCD and liquid crystal module patentsSearch in Eureka ↗ |
| Defendant | Heesung Electronics, Ltd. | Company | South Korean manufacturer of TFT-LCD panels and liquid crystal modulesSearch in Eureka ↗ |
| Plaintiff counsel | Janson Westmoreland | Attorney | Counsel for Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff counsel | John Paul Murphy | Attorney | Counsel for Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Jonathan Hart Rastegar | Attorney | Counsel for Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Justin Bryce Kimble | Attorney | Counsel for Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Patrick Joseph Conroy | Attorney | Counsel for Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Thomas William Kennedy , Jr. | Attorney | Counsel for Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Nelson Bumgardner Conroy PC | Law Firm | Representing Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Nelson Bumgardner Conroy PC (Dallas) | Law Firm | Representing Bishop Display Tech, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Nelson Bumgardner Conroy PC (Fort Worth) | Law Firm | Representing Bishop Display Tech, LLCSearch in Eureka ↗ |
| Defendant counsel | Conrad Gosen | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant counsel | D. James Pak | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant counsel | Deron R. Dacus | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant counsel | Gyushik Jang | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant counsel | Iman Lordgooei | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant counsel | Natalie Huh | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant counsel | Shannon Marie Dacus | Attorney | Counsel for Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant law firm | Quinn Emanuel Urquhart & Sullivan LLP | Law Firm | Representing Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant law firm | Quinn Emanuel Urquhart & Sullivan LLP (San Francisco) | Law Firm | Representing Heesung Electronics, Ltd.Search in Eureka ↗ |
| Defendant law firm | The Dacus Firm PC | Law Firm | Representing Heesung Electronics, Ltd.Search in Eureka ↗ |
| Presiding judge | Judge Rodney Gilstrap | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order is purely procedural: Judge Gilstrap granted the joint stipulation as submitted, making no finding on infringement, invalidity, or claim construction. The symmetrical dismissal of both plaintiff’s claims and defendant’s counterclaims without prejudice reflects a negotiated exit rather than a litigation victory for either side. The phrasing ‘without prejudice’ is legally significant — it preserves Bishop Display Tech’s right to refile and means the six TFT-LCD patents carry no judicial scar from this proceeding.
US6787829B2 and five further TFT-LCD patents — liquid crystal display technology
The six patents asserted — US6787829B2, US6850303B2, US6906769B2, US6801293B1, US6816208B2, and US6525798B1 — all fall within the TFT-LCD and liquid crystal module technology domain. The application dates, traceable through the corrected application numbers, place their priority periods in the early 2000s, a formative era for flat-panel display technology. The patents cover various aspects of thin-film transistor array fabrication, liquid crystal cell structure, module assembly, and display driving architecture.
From a competitive standpoint, a portfolio of six early-2000s TFT-LCD patents held by a non-practising entity represents a structured licensing asset targeting the global display supply chain. Heesung Electronics, as a manufacturer of TFT-LCD panels and LCMs supplied to downstream OEM customers, is precisely the type of defendant such a portfolio is designed to reach. Any company designing products incorporating TFT-LCD panels — regardless of direct Heesung supply relationships — should assess exposure to this patent family.
Should your product team run an FTO against the Bishop Display TFT-LCD portfolio?
Any manufacturer, integrator, or OEM whose products incorporate TFT-LCD panels or liquid crystal modules should treat the Bishop Display portfolio as an active FTO priority. The six patents survived this proceeding without any limiting claim construction ruling. Companies sourcing Heesung LCMs, or panels using comparable TFT-LCD architectures, face unresolved claim scope exposure that the public litigation record did not narrow.
PatSnap Eureka’s FTO Search Agent allows your team to map product-level features against the full claim scope of all six asserted patents simultaneously. Eureka surfaces prior art, identifies design-around opportunities, and flags family members that may not appear in the US litigation record. For display-sector IP teams, running a portfolio-level FTO against US6787829B2 and its co-asserted patents is a low-cost, high-value step relative to the licensing exposure these assets represent.
Run a freedom-to-operate analysis on US6787829B2 to assess your product’s exposure
Run FTO in Eureka →Similar TFT-LCD patent cases in the Eastern District of Texas
Explore related TFT-LCD and flat-panel display patent infringement actions litigated before Judge Gilstrap and other E.D. Texas judges against display manufacturers.
What this case signals for the TFT-LCD and display module IP landscape
Six foundational display patents exit E.D. Texas intact. The enforcement risk for panel manufacturers and module integrators has not diminished.
E.D. Texas remains the preferred venue for display patent assertion
Judge Gilstrap’s court continues to attract high-volume patent assertion cases involving Asian display manufacturers. Companies importing TFT-LCD panels or liquid crystal modules into the US market face material venue risk in this district, and should audit supply chains accordingly before a complaint is filed.
Without-prejudice exit preserves the plaintiff’s enforcement optionality
The stipulated dismissal without prejudice is structurally distinct from a settlement with prejudice. Bishop Display Tech retains the right to reassert all six patents against Heesung or any third party. Display OEMs and component buyers sourcing from Heesung should treat these patents as still-active licensing exposure rather than resolved risk.
Bishop v Heesung — key questions answered
Bishop Display Tech asserted six US patents: US6787829B2, US6850303B2, US6906769B2, US6801293B1, US6816208B2, and US6525798B1. All relate to TFT-LCD and liquid crystal module technology. The accused products were Heesung’s TFT-LCD panels, liquid crystal modules, and products incorporating those components.
The case was dismissed by joint stipulation of both parties under Federal Rule of Civil Procedure 41. The court entered no merits ruling. A without-prejudice dismissal means the plaintiff retains the right to refile. The public record does not disclose the specific commercial terms, if any, that prompted the parties to seek dismissal.
No. A dismissal without prejudice carries no finding on patent validity or infringement. Judge Gilstrap’s order was purely procedural. All six asserted patents remain in force and Bishop Display Tech is legally free to assert them in future proceedings against Heesung or any other party.
Judge Gilstrap of the Eastern District of Texas handles one of the largest patent dockets of any US district judge. His court is a preferred venue for patent assertion entities targeting international manufacturers. Cases before him tend to follow structured scheduling orders, and his familiarity with patent claim construction proceedings is well established in the patent litigation bar.
The accused products included Heesung TFT-LCD panels, Heesung liquid crystal modules comprising TFT-LCDs, products incorporating Heesung TFT-LCDs or LCMs, and components of the foregoing. This broad product scope is typical of NPE complaints designed to reach the full supply chain of a display manufacturer.
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