SemiLED Innovations LLC v. Current Lighting Solutions LLC

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: SemiLED Innovations LLC (Texas)
  • Defendant: Current Lighting Solutions, LLC (Delaware)
  • Plaintiff's Counsel: Durst Kerridge LLC
• Case Identification: 1:26-cv-01718, N.D. Ohio, 07/23/2026
• Venue Allegations: Venue is based on Defendant's regular and established place of business in Beachwood, Ohio, and alleged commission of substantial acts of infringement within the district.
• Core Dispute: Plaintiff alleges that Defendant's residential and commercial LED lighting products infringe four patents related to LED semiconductor device structure, interconnection, and packaging.
• Technical Context: The technology concerns the design and fabrication of light-emitting diodes (LEDs), focusing on structural innovations to improve current distribution, thermal efficiency, and mechanical reliability in high-power lighting applications.
• Key Procedural History: The complaint alleges that Defendant was aware of the patents-in-suit and their relevance to its products prior to the lawsuit as a result of Plaintiff's "proactive efforts to engage Defendant in licensing discussions," which did not result in a license.

Case Timeline

Date	Event
2007-12-03	Priority Date for '196 and '942 Patents
2009-09-25	Priority Date for '246 Patent
2010-01-07	Priority Date for '971 Patent
2012-11-13	'971 Patent Issued
2012-11-27	'246 Patent Issued
2015-02-24	'196 Patent Issued
2016-12-27	'942 Patent Issued
2026-07-23	Complaint Filed

II. Technology and Patent(s)-in-Suit Analysis

U.S. Patent No. 8,309,971 - "Light Emitting Diode Having Electrode Pads"

• Patent Identification: U.S. Patent No. 8,309,971 ("Light Emitting Diode Having Electrode Pads"), issued November 13, 2012 (the "'971 Patent").

The Invention Explained

• Problem Addressed: The patent's background identifies a challenge in designing large, high-output LEDs where achieving efficient, uniform current spreading is difficult Compl. ¶17 Using a conventional transparent electrode layer to spread current is suboptimal because the layer tends to absorb light, which limits its permissible thickness and, consequently, its current-spreading capability Compl. ¶18 '971 Patent, col. 1:61-67
• The Patented Solution: The invention proposes a specific electrode geometry to improve current distribution without relying on a thick, light-absorbing layer. The design insulates a second electrode pad from the underlying semiconductor layers and uses "at least one upper extension" that connects the electrode pad to the second conductive type semiconductor layer Compl. ¶19 '971 Patent, abstract This configuration is intended to facilitate more uniform current flow across the device's light-emitting area, enhancing luminous efficacy '971 Patent, col. 6:21-26
• Technical Importance: This approach provided a method to increase the brightness and electrical efficiency of high-power LEDs by addressing the fundamental trade-off between current spreading and light absorption Compl. ¶19

Key Claims at a Glance

• The complaint asserts independent claim 1 and dependent claims 7-9 and 11 Compl. ¶45
• The essential elements of independent claim 1 include:
  • a substrate;
  • a first conductive type semiconductor layer arranged on the substrate;
  • a second conductive type semiconductor layer arranged on the first conductive type semiconductor layer;
  • an active layer disposed between the first and second conductive type semiconductor layers;
  • a first electrode pad electrically connected to the first conductive type semiconductor layer;
  • a second electrode pad arranged on the second conductive type semiconductor layer;
  • an insulation layer disposed between the second conductive type semiconductor layer and the second electrode pad; and
  • at least one upper extension electrically connected to the second electrode pad, the at least one upper extension being electrically connected to the second conductive type semiconductor layer.
• Plaintiff reserves the right to assert other claims during discovery Compl. ¶45

U.S. Patent No. 8,319,246 - "Semiconductor Device And Method For Manufacturing Same"

• Patent Identification: U.S. Patent No. 8,319,246 ("Semiconductor Device And Method For Manufacturing Same"), issued November 27, 2012 (the "'246 Patent").

The Invention Explained

• Problem Addressed: The patent addresses shortcomings in prior art "flip chip" mounting for LEDs. While flip-chip mounting is optimal for heat dissipation, the "columnar metal" structures used for connection presented a dilemma: increasing their aspect ratio to better absorb stress (e.g., by making them thinner) could lead to "worse joining strength, less reliability, and increased cost" Compl. ¶25 '246 Patent, col. 1:29-37
• The Patented Solution: The patent discloses a semiconductor device structure featuring a "plurality of metal pillars" that are joined separately to an electrode pad and connect to a common "external terminal" '246 Patent, abstract A key aspect is that the metal pillars have a smaller area in a plan view than the external terminal '246 Patent, col. 4:3-6 This design is intended to improve stress mitigation and joining strength without the cost and reliability issues of prior art methods Compl. ¶26
• Technical Importance: This innovation aimed to enhance the mechanical reliability and manufacturability of flip-chip LEDs, which are critical for high-power applications where thermal management and robust connections are paramount Compl. ¶26

Key Claims at a Glance

• The complaint asserts independent claim 1 Compl. ¶63
• The essential elements of independent claim 1 include:
  • a semiconductor structure unit including a major surface;
  • an interconnect layer provided on the major surface side of the semiconductor structure unit;
  • an electrode pad provided on a surface of the interconnect layer on a side opposite to a surface on which the semiconductor structure unit is provided, and the electrode pad electrically connected to the interconnect layer;
  • a plurality of metal pillars joined to the electrode pad separately from each other; and
  • an external terminal provided commonly at tips of the plurality of metal pillars, the metal pillars having an area in a plan view smaller than an area in a plan view of the external terminal.

U.S. Patent No. 8,963,196 - "Slim LED Package"

• Patent Identification: U.S. Patent No. 8,963,196 ("Slim LED Package"), issued February 24, 2015 (the "'196 Patent").
• Technology Synopsis: The patent addresses issues with prior art LED packages, including excessive thickness and degradation ("yellowing") of the encapsulation material due to heat Compl. ¶32 '196 Patent, col. 1:53-57 The patented solution is a "slim LED package" design featuring a "chip mounting recess" formed on a lead frame, which allows the LED chip's thickness to partially overlap with the lead frame's thickness, reducing overall package height and improving thermal dissipation Compl. ¶¶33-34 '196 Patent, col. 2:62-66
• Asserted Claims: Independent claim 1 Compl. ¶77
• Accused Features: The "Evolve Roadway Light" is accused of infringing. Allegations focus on the package's separated first and second lead frames, an LED chip disposed on the first lead frame, and opposing sides of the lead frames that allegedly "face each other in a slanted state" Compl. ¶¶79-82

U.S. Patent No. 9,530,942 - "Slim LED Package"

• Patent Identification: U.S. Patent No. 9,530,942 ("Slim LED Package"), issued December 27, 2016 (the "'942 Patent").
• Technology Synopsis: This patent, like the '196 Patent, is directed at creating a slimmer LED package with better thermal performance to overcome problems of excessive thickness and material degradation Compl. ¶¶39-40 '942 Patent, col. 1:57-62 The solution also involves a "chip mounting recess" on the lead frame Compl. ¶41 This patent further specifies structural features on the lead frames, including grooves on their lower surfaces, to enhance bonding with the encapsulation material (Compl. ¶94; '942 Patent, claim 1(f)).
• Asserted Claims: Independent claim 1 Compl. ¶88
• Accused Features: The "Evolve Roadway Light" is accused of infringing. The complaint specifically identifies a first groove on the lower surface of the first lead frame and a second groove on the lower surface of the second lead frame, which are allegedly open only on the lower surfaces and have equal depths Compl. ¶¶94-96

III. The Accused Instrumentality

Product Identification

• The complaint identifies a range of Defendant's residential and commercial lighting products as the "Accused Products" Compl. ¶2 The infringement allegations provide specific analysis of the "Exo Sling Light" (for the '971 Patent), the "Kim Lighting Floodlight" (for the '246 Patent), and the "Evolve Roadway Light" (for the '196 and '942 Patents) Compl. ¶46 Compl. ¶64 Compl. ¶78 Compl. ¶89

Functionality and Market Context

• The accused instrumentalities are commercialized LED lighting products Compl. ¶2 The complaint's allegations are not focused on the products' end-user functions but on the microscopic physical structures of the LED components within them. The complaint provides extensive visual evidence, including photographs and scanning electron microscope (SEM) images, to detail the internal construction of the LED semiconductor devices and packages. The complaint provides an annotated SEM image of the accused "Kim Lighting Floodlight," which shows the alleged "plurality of metal pillars" that are joined to an electrode pad but are separate from each other, a key feature of the infringement allegation for the '246 Patent Compl. Fig. 2B-12

IV. Analysis of Infringement Allegations

'971 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
A light emitting diode, comprising a substrate;	The accused Exo Sling Light contains light emitting diodes comprising a substrate.	¶46	col. 5:1-3
a first conductive type semiconductor layer arranged on the substrate;	The accused device contains a first conductive type semiconductor layer arranged on the substrate.	¶47	col. 5:5-10
a second conductive type semiconductor layer arranged on the first conductive type semiconductor layer;	The accused device contains a second conductive type semiconductor layer arranged on the first layer.	¶48	col. 5:6-10
an active layer disposed between the first conductive type semiconductor layer and the second conductive type semiconductor layer;	The accused device contains an active layer between the first and second semiconductor layers.	¶49	col. 5:8-10
a first electrode pad electrically connected to the first conductive type semiconductor layer;	The accused device contains a first electrode pad electrically connected to the first layer.	¶50	col. 5:50-53
a second electrode pad arranged on the second conductive type semiconductor layer;	The accused device contains a second electrode pad arranged on the second semiconductor layer.	¶51	col. 5:53-55
an insulation layer disposed between the second conductive type semiconductor layer and the second electrode pad;	The accused device contains an insulation layer between the second semiconductor layer and the second electrode pad.	¶52	col. 5:53-57
and at least one upper extension electrically connected to the second electrode pad, the at least one upper extension being electrically connected to the second...layer.	The accused device contains an upper extension that is electrically connected to both the second electrode pad and the second conductive semiconductor layer.	¶53	col. 6:11-23

• Identified Points of Contention:
  • Scope Questions: A potential dispute may arise over the term "arranged on" in element 1(f). The complaint's visual evidence suggests the second electrode pad is physically separated from the second semiconductor layer by an insulation layer Compl. Fig. 1B-7 This raises the question of whether a component insulated from a layer can be considered "arranged on" that layer as required by the claim.
  • Technical Questions: The complaint provides an SEM image purporting to show the claimed "upper extension" Compl. Fig. 1B-8 A key technical question for the court will be whether this structure in the accused device in fact performs the dual electrical connection function required by the claim-connecting to both the second electrode pad and the second conductive type semiconductor layer.

'246 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
A semiconductor device comprising: a semiconductor structure unit including a major surface;	The accused Kim Lighting Floodlight is a semiconductor device that includes a semiconductor structure unit with a major surface.	¶¶64-65	col. 2:32-33
an interconnect layer provided on the major surface side of the semiconductor structure unit;	The accused device includes an interconnect layer on the major surface side of the semiconductor structure unit.	¶66	col. 2:47-49
an electrode pad provided on a surface of the interconnect layer on a side opposite to a surface on which the semiconductor structure unit is provided...	The accused device has an electrode pad on the interconnect layer, on the side opposite the semiconductor unit, and electrically connected to the interconnect layer.	¶67	col. 2:63-65
a plurality of metal pillars joined to the electrode pad separately from each other; and	The accused device includes multiple metal pillars that are joined to the electrode pad and are physically separate from one another.	¶68	col. 3:31-33
an external terminal provided commonly at tips of the plurality of metal pillars...	The accused device contains an external terminal commonly provided at the tips of the metal pillars.	¶69	col. 4:1-3
the metal pillars having an area in a plan view smaller than an area in a plan view of the external terminal.	The complaint alleges, with supporting SEM images, that the metal pillars have a plan view area smaller than that of the external terminal.	¶70	col. 4:3-6
wherein the semiconductor structure unit includes a light-emitting layer.	Analysis of the accused device allegedly shows the semiconductor structure unit includes a light-emitting layer comprising Gallium Nitride (GaN).	¶71	col. 2:35-37

• Identified Points of Contention:
  • Technical Questions: A factual dispute may center on whether the structures identified as "metal pillars" in the complaint's SEM images Compl. Fig. 2B-9 are "joined... separately from each other" as claimed. The complaint provides a visual showing separation between pillars Compl. Fig. 2B-12 The defense may challenge whether these structures function as distinct pillars or as a contiguous, albeit uneven, single connection.
  • Evidentiary Questions: The claim requires a dimensional comparison: the "area in a plan view" of the pillars must be smaller than that of the external terminal. The complaint presents a cross-sectional image to support this Compl. Fig. 2B-14 The validity of this comparison, the measurement methodology, and the representativeness of the chosen cross-section may become points of contention.

V. Key Claim Terms for Construction

'971 Patent

• The Term: "at least one upper extension"
• Context and Importance: This term describes the core feature for achieving improved current spreading. Infringement of claim 1 depends on whether the accused device contains a structure that meets the definition of an "upper extension," which must connect both the second electrode pad and the second semiconductor layer. Practitioners may focus on this term because it is the central point of novelty cited by the patent to overcome prior art limitations.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The specification describes the function of the extension as enabling "uniform current spreading" and improving efficiency '971 Patent, col. 6:21-26 It also depicts multiple different geometric configurations for the extensions, suggesting the term is not limited to a single shape (e.g., '971 Patent, Fig. 1; '971 Patent, Fig. 8).
  • Evidence for a Narrower Interpretation: The embodiments consistently show the upper extensions as distinct, finger-like, or branching conductive paths separate from the main electrode pads themselves '971 Patent, Fig. 1 '971 Patent, Fig. 11 A party could argue the term should be limited to such specifically disclosed structures, as opposed to a simple conductive trace.

'246 Patent

• The Term: "plurality of metal pillars joined to the electrode pad separately from each other"
• Context and Importance: This limitation is central to the patent's asserted improvement in reliability and stress absorption. The infringement determination will turn on whether the interconnects in the accused device are properly characterized as a plurality of separate "pillars." Practitioners may focus on this term because it distinguishes the invention from a single, monolithic bump connection.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The patent's summary describes the invention as providing "a plurality of metal pillars" that are "separately from each other" to improve reliability '246 Patent, abstract '246 Patent, col. 4:14-22 This functional description could support a construction covering any set of discrete conductive formations that achieve the stress-mitigation goal.
  • Evidence for a Narrower Interpretation: The background section discusses the problems with "columnar metal" and its "aspect ratio," which may suggest that a "pillar" must be a structure with a significant height relative to its width '246 Patent, col. 1:24-31 A party could argue that the term excludes structures that are more like bumps or mounds than columns.

VI. Other Allegations

• Indirect Infringement: The complaint includes general allegations of direct and/or indirect infringement for all four patents-in-suit Compl. ¶44 Compl. ¶62 Compl. ¶76 Compl. ¶87 However, it does not plead specific facts to support a standalone theory of induced or contributory infringement, such as detailing instructions to third parties.
• Willful Infringement: For each of the four asserted patents, the complaint alleges that Defendant was aware of Plaintiff's patent portfolio and its relevance to the accused products "since before the complaint was filed as a result of Plaintiff's proactive efforts to engage Defendant in licensing discussions" Compl. ¶58 Compl. ¶72 Compl. ¶83 Compl. ¶97 The complaint asserts that Defendant's alleged infringement, despite this pre-suit knowledge, was willful and supports an award of enhanced damages and attorneys' fees.

VII. Analyst's Conclusion: Key Questions for the Case

• Definitional Scope: A core issue across the '971 and '246 Patents will be one of definitional scope: can the terms "upper extension" and "plurality of metal pillars," which are central to the patents' claimed inventive concepts, be construed to read on the specific conductive micro-structures identified in the accused products via SEM imagery? The resolution will depend on how the court interprets the claims in light of the patent specifications and the visual evidence presented.
• Factual Congruence: For the '196 and '942 "Slim LED Package" patents, a key question will be one of factual congruence: does the accused "Evolve Roadway Light" package contain the precise geometric features required by the claims, such as lead frames with "slanted" opposing sides '196 Patent and "grooves" of equal depth on their lower surfaces '942 Patent? This will likely be a fact-intensive inquiry comparing the physical products to the claim language.
• Willfulness and Intent: A significant question impacting potential damages is that of willfulness. Given the explicit allegation that Defendant had pre-suit notice of the patents through licensing negotiations, the court will have to determine whether Defendant's decision to proceed with the accused products constituted objectively reckless behavior, which could expose it to enhanced damages.