KT Imaging USA LLC v. Dell Tech Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: KT Imaging USA, LLC (Texas)
  • Defendant: Dell Technologies Inc. (Delaware); Dell Inc. (Delaware)
  • Plaintiff's Counsel: THE STAFFORD DAVIS FIRM, PC; Kheyfits Belenky LLP
• Case Identification: 6:21-cv-01004, W.D. Tex., 09/28/2021
• Venue Allegations: Venue is alleged to be proper based on Defendant Dell's regular and established place of business within the Western District of Texas and acts of patent infringement allegedly committed within the district.
• Core Dispute: Plaintiff alleges that image sensors within Defendant's mobile devices, including laptops and tablets, infringe three U.S. patents related to the structure and manufacturing methods for compact image sensor modules.
• Technical Context: The technology at issue concerns the physical assembly of camera modules, focusing on methods to miniaturize components, simplify manufacturing, and reduce costs for image sensors used in consumer electronics.
• Key Procedural History: The complaint does not mention any prior litigation, Inter Partes Review (IPR) proceedings, or licensing history related to the patents-in-suit.

Case Timeline

Date	Event
2003-07-16	'544 Patent Priority Date
2004-10-08	'322 Patent Priority Date
2005-04-05	'544 Patent Issue Date
2007-03-27	'322 Patent Issue Date
2008-05-16	'602 Patent Priority Date
2011-08-23	'602 Patent Issue Date
2021-09-28	Complaint Filing Date

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

U.S. Patent No. 6,876,544 - "Image Sensor Module and Method for Manufacturing the Same"

• Patent Identification: U.S. Patent No. 6,876,544, "Image Sensor Module and Method for Manufacturing the Same," issued April 5, 2005.

The Invention Explained

• Problem Addressed: The patent's background section describes difficulties with prior art image sensor modules, including inconvenience in wire bonding, potential for particle contamination on the transparent cover, and increased element count and cost due to the need for a separate lens holder in addition to a frame. '544 Patent, col. 2:41-62
• The Patented Solution: The invention proposes a more integrated design where a single "frame layer" serves multiple functions. This frame layer, mounted on the substrate, is formed with an internal thread and also fixes a transparent layer over the photosensitive chip. A lens barrel with a corresponding external thread can then be screwed directly into this frame layer, eliminating the need for a separate lens holder component. '544 Patent, abstract '544 Patent, col. 2:60-65
• Technical Importance: This design aimed to simplify the manufacturing process and reduce the number of components, thereby lowering the cost of producing the compact camera modules essential for the growing market of personal electronic devices. '544 Patent, col. 2:1-4

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 1. Compl. ¶16
• The essential elements of Claim 1 include:
  • A substrate with first and second connection points.
  • A photosensitive chip mounted on the substrate.
  • A plurality of wires connecting the chip to the substrate's first connection points.
  • A frame layer mounted on the substrate surrounding the chip, where the frame layer has an internal thread and fixes a transparent layer.
  • A lens barrel with an external thread that is screwed into the internal thread of the frame layer.
• The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 7,196,322 - "Image Sensor Package"

• Patent Identification: U.S. Patent No. 7,196,322, "Image Sensor Package," issued March 27, 2007.

The Invention Explained

• Problem Addressed: The patent identifies a problem in prior art designs where the substrate holding the image sensor chip had to be enlarged to provide sufficient space for wire bonding, running counter to the industry's goal of miniaturization. '322 Patent, col. 1:30-35
• The Patented Solution: The invention repositions the electrical connection points for wire bonding. Instead of being on the substrate itself, "first electrodes" are formed on a separate "frame layer" that sits on top of the substrate. The photosensitive chip is then wired to these electrodes on the frame layer. A lens holder is designed with a recess, or "breach," at its base that fits over this frame layer assembly, allowing for a more compact overall package with a smaller substrate. '322 Patent, abstract '322 Patent, col. 2:20-32
• Technical Importance: This architecture decouples the size of the substrate from the area needed for wire bonding, enabling further reduction in the footprint of image sensor packages. '322 Patent, col. 1:40-49

Key Claims at a Glance

• The complaint asserts infringement of at least independent claim 1. Compl. ¶21
• The essential elements of Claim 1 include:
  • A substrate with an upper and lower surface.
  • A frame layer on the substrate, with a cavity formed between them and "a plurality of first electrodes" on the frame layer.
  • A photosensitive chip mounted on the substrate within the cavity and electrically connected to the first electrodes of the frame layer.
  • A lens holder with an internal thread and a "breach" at its lower end, where the frame layer is "located within the breach."
  • A lens barrel with an external thread screwed into the lens holder.
• The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 8,004,602 - "Image Sensor Structure and Integrated Lens Module Thereof"

• Patent Identification: U.S. Patent No. 8,004,602, "Image Sensor Structure and Integrated Lens Module Thereof," issued August 23, 2011.

The Invention Explained

• Technology Synopsis: The patent describes an image sensor structure designed to simplify manufacturing and reduce size by eliminating the need for wire bonding. '602 Patent, col. 2:15-20 The solution involves a chip with at least one "conducting channel" passing through the chip itself to connect the light-sensing area to contacts on the bottom surface, and a lens module where the lens is pre-integrated with its holder before being attached to the chip. '602 Patent, abstract

Key Claims at a Glance

• Asserted Claims: At least independent claim 1 is asserted. Compl. ¶26
• Accused Features: The complaint alleges that the image sensor in the Dell Vostro 3400 Laptop infringes. The accused features include the chip's structure with light-sensing elements, conducting pads, and a conducting channel, as well as a lens module with an embedded lens combined with the chip's surface. Compl. ¶26

III. The Accused Instrumentality

Product Identification

• The accused instrumentalities are "mobile devices, such as smartphones, tablets, and laptops with front and/or rear image sensors" sold by Dell. Compl. ¶13 The complaint specifically identifies the Dell Latitude 7200, Dell Latitude 7210, and Dell Vostro 3400 Laptop as infringing products. Compl. ¶16 Compl. ¶21; Compl. ¶26

Functionality and Market Context

• The allegations focus on the internal construction of the image sensor modules within these devices. The complaint alleges that the physical assembly of the substrate, photosensitive chip, frame, and lens components in the specified Dell products embodies the patented technologies. Compl. ¶¶16, 21, 26 A cross-sectional image from a teardown of the Dell Vostro 3400 Laptop's image sensor is referenced to show the accused structure. Compl. ¶26 Compl. Ex. 8 The complaint does not contain allegations regarding the specific market positioning of these products beyond their sale by Dell.

IV. Analysis of Infringement Allegations

'544 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a substrate having an upper surface formed with a plurality of first connection points, and a lower surface formed with a plurality of second connection points...	The image sensor module in the Accused Products comprises a substrate having an upper surface formed with a plurality of first connection points and a lower surface formed with a plurality of second connection points, which is electrically connected to the printed circuit board.	¶16	col. 2:48-52
a photosensitive chip mounted to the upper surface of the substrate	The image sensor module further comprises a photosensitive chip mounted to the upper surface of the substrate.	¶16	col. 2:53-55
a plurality of wires for electrically connecting the photosensitive chip to the first connection points on the upper surface of the substrate	The image sensor module further comprises a plurality of wires for electrically connecting the photosensitive chip to the first connection points on the upper surface of the substrate.	¶16	col. 2:56-59
a frame layer mounted to the upper surface of the substrate to surround the photosensitive chip, an inner edge of the frame layer being formed with an internal thread from top to bottom, and a transparent layer being fixed by the frame layer...	The image sensor module further comprises a frame layer mounted to the upper surface of the substrate to surround the photosensitive chip, an inner edge of the frame layer being formed with an internal thread from top to bottom, and a transparent layer being fixed by the frame layer...	¶16	col. 2:60-65
a lens barrel formed with a chamber at a center thereof and an external thread at an outer edge thereof, the external thread being screwed to the internal thread of the frame layer...	The image sensor module further comprises a lens barrel formed with a chamber at a center thereof and an external thread at an outer edge thereof, the external thread being screwed to the internal thread of the frame layer...	¶16	col. 3:4-9

'322 Patent Infringement Allegations

Claim Element (from Independent Claim 1)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
a substrate having an upper surface, and a lower surface on which second electrodes are formed	The image sensor module structure in the Accused Products comprises a substrate having an upper surface, and a lower surface on which second electrodes are formed.	¶21	col. 2:15-18
a frame layer arranged on the upper surface of the substrate, a cavity formed between the frame layer and substrate, and a plurality of first electrodes are formed on the frame layer	The image sensor module structure in the Accused Products further comprises a frame layer arranged on the upper surface of the substrate, a cavity formed between the frame layer and substrate, and a plurality of first electrodes are formed on the frame layer.	¶21	col. 2:20-24
a photosensitive chip mounted on the upper surface of the substrate and located within the cavity, and electrically connected to the first electrodes of the frame layer	The image sensor module structure in the Accused Products further comprises a photosensitive chip mounted on the upper surface of the substrate and located within the cavity, and electrically connected to the first electrodes of the frame layer.	¶21	col. 2:25-29
a lens holder having an upper end face, a lower end face, and an opening penetrating through the lens holder... the lower end of the opening formed with a breach... wherein, the frame layer is located within the breach of the lens holder	The image sensor module structure... comprises a lens holder having an upper end face, a lower end face, and an opening... the lower end of the opening formed with a breach... wherein, the frame layer is located within the breach of the lens holder. A cross-sectional image of the Dell Latitude 7210 is provided to illustrate this structure. Compl. ¶21 Compl. Ex. 6	¶21	col. 2:32-40
a lens barrel having an upper end face, a lower end face, and an external thread screwed to the internal thread of the lens holder	The image sensor module structure... further comprises a lens barrel having an upper end face, a lower end face, and an external thread screwed to the internal thread of the lens holder.	¶21	col. 2:41-44

Identified Points of Contention

• Technical Questions: For both the '544 and '322 patents, a primary point of contention will likely be factual and technical: do the mechanical components of the accused Dell image sensors, as revealed in teardowns, actually possess the specific structures recited in the claims? For the '544 patent, this includes whether the accused "frame layer" and "lens barrel" are distinct components connected by threads. For the '322 patent, this includes whether the accused "lens holder" has a "breach" and whether the "frame layer" is located "within" it as claimed.
• Scope Questions: The case may raise questions about the scope of the claim terms. For instance, regarding the '322 patent, the court may need to determine the meaning of "breach." The infringement analysis will depend on whether this term is construed broadly to mean any recess or cutout, or narrowly to the specific "triangular form" disclosed in the patent's embodiment. '322 Patent, col. 2:37-38

V. Key Claim Terms for Construction

'544 Patent

• The Term: "frame layer"
• Context and Importance: This term is central to Claim 1, as the "frame layer" is the inventive component that purportedly replaces the prior art's separate lens holder and simplifies manufacturing. Its structural and functional characteristics-being mounted on the substrate, surrounding the chip, fixing a transparent layer, and having an internal thread for the lens barrel-are critical for the infringement analysis.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claim language itself provides a functional definition, requiring a layer that surrounds the chip and has an internal thread. '544 Patent, col. 4:13-22 An argument could be made that any component performing these functions meets the limitation, regardless of its specific material or method of manufacture.
  • Evidence for a Narrower Interpretation: The specification discloses that the "frame layer" is "formed of industrial plastic material by way of injection molding," and that this process "simultaneously form[s] the internal thread and fix[es] the transparent layer." '544 Patent, col. 4:26-30 A defendant may argue that the term should be limited to a single, injection-molded plastic component with these integrated features.

'322 Patent

• The Term: "breach"
• Context and Importance: The spatial relationship defined by this term is a key limitation in Claim 1, which requires that "the frame layer is located within the breach of the lens holder." '322 Patent, col. 3:9-10 The existence and scope of a "breach" in the accused product will be a dispositive issue for infringement. Practitioners may focus on this term as it is not a standard term of art and its meaning is pivotal.
• Intrinsic Evidence for Interpretation:
  • Evidence for a Broader Interpretation: The claim describes the "breach" as being "formed with" the lower end of the lens holder's opening, where the internal diameter of the upper end of the opening is smaller than the lower end. '322 Patent, col. 3:4-8 A plaintiff may argue "breach" simply refers to the wider, recessed portion at the bottom of the holder designed to accommodate another component.
  • Evidence for a Narrower Interpretation: The detailed description provides a specific example, stating that "in the embodiment, the breach 74 of the opening 71 is a triangular form." '322 Patent, col. 2:37-38 A defendant may argue that the term "breach" is limited to a cutout with a specific geometry, such as the triangular form disclosed, rather than any simple widening of the opening.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement for all three patents-in-suit. The allegations are based on Dell providing the accused products along with "specifications, instructions, manuals, advertisements, marketing materials, and technical assistance relating to the installation, set up, use, operation, and maintenance of said products," which allegedly encourage and direct others to infringe. Compl. ¶17 Compl. ¶22 Compl. ¶27
• Willful Infringement: The complaint does not explicitly allege "willful" infringement or plead facts related to pre-suit knowledge of the patents. The prayer for relief requests attorneys' fees under 35 U.S.C. § 285 for an "exceptional case" but does not explicitly request enhanced damages for willfulness under § 284. Compl. p. 8

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

1. A question of structural mapping: Will detailed technical analysis of the accused Dell image sensors reveal a one-to-one correspondence with the specific mechanical structures recited in the claims? The case may turn on micro-level factual determinations, such as whether threads connect a frame and lens barrel ('544 Patent) or whether a "frame layer" sits "within the breach" of a lens holder ('322 Patent).

2. A question of claim construction: How will the court construe key, non-standard terms like "breach" ('322 Patent)? The outcome of the infringement analysis will heavily depend on whether the court adopts broader, functional definitions or narrower definitions tied to the specific shapes and manufacturing methods disclosed in the patent embodiments.

3. A question of technological advancement: For the '602 patent, a central issue will be evidentiary: does the accused Dell Vostro 3400 laptop's image sensor actually use a "conducting channel passing through the chip" to eliminate wire bonding, as claimed? Proving infringement of this patent will require demonstrating that the accused product implements this more advanced through-silicon via technology, rather than a more conventional packaging architecture.