US 8319512

Here's a concise summary of US patent 8319512:

US Patent 8319512

• Title: Flexible substrate including inspection electrode for outputting signal processed in integrated circuit, electro-optical device, and electronic device
• Assignee: 138 East LCD Advancements Ltd (current assignee); Seiko Epson Corp (original assignee)
• Inventor(s): Katsutoshi Ueno
• Filing Date: 2010-03-12
• Issue Date: 2012-11-27
• Abstract: A flexible substrate includes a substrate body; a plurality of lines that are arranged on the substrate body; a plurality of connection terminals that are arranged on an end portion of the substrate body and electrically connected to the respective lines; an integrated circuit that is arranged on the substrate body and electrically connected to at least one of the lines; and an inspection electrode that is arranged on the substrate body and electrically connected to the integrated circuit and capable of outputting a signal processed in the integrated circuit.

Plain-Language Overview of Independent Claims:

• Claim 1: This claim describes a flexible substrate that has a main body, multiple electrical lines, and connection points at one end for these lines. It also includes an integrated circuit on the substrate connected to at least one line. Critically, it features an "inspection electrode" on the substrate that's connected to the integrated circuit and can output a signal processed by the integrated circuit. Furthermore, this flexible substrate includes a "switching section" that can turn the inspection electrode's operation on or off, controlling whether it outputs the processed signal.
• Claim 8: Similar to Claim 1, this claim describes a flexible substrate with a substrate body, multiple lines, connection terminals, an integrated circuit, and an inspection electrode connected to the integrated circuit for outputting processed signals. The key distinction here is that it includes a "switching section" specifically designed to change the type of signal that the inspection electrode outputs.
• Claim 9: This claim also describes a flexible substrate with a substrate body, multiple wirings (lines), and connection terminals for connecting a device to at least one wiring. It includes an inspection electrode that connects to an integrated circuit and outputs a signal processed by the integrated circuit. A "switching section" is present to switch the types of signals the inspection electrode outputs. A specific feature is that the inspection electrode is located physically between two of the wirings, and the integrated circuit is connected to at least one of the wirings.
• Claim 10: This claim describes a flexible substrate that includes a substrate body, multiple wirings, and connection terminals to electrically connect a device to at least one of these wirings. It also has an inspection electrode on the substrate body that is electrically connected to an integrated circuit and can output a signal processed by that integrated circuit. Similar to Claim 9, a key aspect is that the inspection electrode is positioned between one of the wirings and another of the wirings, and the integrated circuit is electrically connected to at least one of the wirings.

USPTO and CAFC 2026 Dockets:

A search of the USPTO database confirms that US Patent 8319512 is currently "Active" and is set to expire on 2031-02-04. The Google Patents information for US8319512B2 also indicates that the "Family has litigation," with several US cases filed in the Texas Eastern District Court (e.g., 2:25-cv-00440, 2:23-cv-00165, 2:25-cv-00358) and a PTAB IPR case (IPR2025-01413) filed in 2025. Direct CAFC dockets for 2026 specifically associated with patent number 8319512 were not found through the performed searches.

US patent 8319512 has been involved in multiple litigation cases in the United States.

Known litigation involving US patent 8319512 as of April 26, 2026, includes:

1. Longitude Licensing Limited et al. v. BOE Technology Group Co., Ltd. et al.

   • Jurisdiction: U.S. District Court for the Eastern District of Texas
   • Case Number: 2:25-cv-00440-JRG-RSP
   • Filing Date: April 25, 2025
   • Plaintiff(s): Longitude Licensing Limited and 138 East LCD Advancements Limited
   • Defendant(s): BOE Technology Group Co., Ltd., LG Electronics, Inc., Hisense Group Holdings Co., Ltd., and Hisense Visual Technology Co., Ltd.
   • Outcome or Current Status: This case is ongoing. It was consolidated with 2:25-cv-00358. As of October 21, 2025, a scheduling/case management conference was set for November 24, 2025, and invalidity contentions were due by January 5, 2026. A trial date in April 2027 was anticipated.

2. Longitude Licensing Limited et al. v. BOE Technology Group Co., Ltd. et al.

   • Jurisdiction: U.S. District Court for the Eastern District of Texas
   • Case Number: 2:25-cv-00358-JRG-RSP
   • Filing Date: April 8, 2025
   • Plaintiff(s): Longitude Licensing Limited and 138 East LCD Advancements Limited
   • Defendant(s): BOE Technology Group Co., Ltd.
   • Outcome or Current Status: This case is ongoing and has been consolidated with case 2:25-cv-00440.

3. Inter Partes Review (IPR) against US Patent 8319512

   • Jurisdiction: Patent Trial and Appeal Board (PTAB)
   • Case Number: IPR2025-01413
   • Filing Date: The effective date of the AIA trial proceeding filing was August 30, 2025, with the IPR formally filed on September 30, 2025.
   • Petitioner (Plaintiff): BOE Technology Group Co., Ltd.
   • Patent Owner (Defendant): 138 East LCD Advancements Ltd.
   • Outcome or Current Status: Not Instituted - Procedural.

It is important to note that the patent document also lists a US case 2:23-cv-00165 filed in Texas Eastern District Court. However, the provided search results from November 2025 pertaining to IPR2025-01412 and IPR2025-01396, which discuss litigation involving the '512 patent, do not mention 2:23-cv-00165 as an active case asserting the '512 patent alongside the 2:25-cv cases. The search results primarily focus on the 2:25-cv-00358 and 2:25-cv-00440 cases for the '512 patent, indicating these are the primary ongoing litigations. The details for 2:23-cv-00165, such as plaintiff, defendant, and outcome, are not explicitly provided in the patent text or further elaborated in the search results in connection with US8319512. Therefore, while acknowledged as having been filed, specific actionable details about its current relevance to US8319512 are not available within the provided authoritative text.

Proceedings overview

One AIA trial proceeding has been filed against US patent 8319512. This proceeding, IPR2025-01413, resulted in a discretionary denial of institution, meaning the patent claims have not been challenged on the merits in this PTAB forum. This leaves the patent's claims formally untested by this IPR proceeding.

IPR2025-01413 — BOE Technology Group Co., Ltd. et al. v. 138 East LCD Advancements Limited et al.

• Type: Inter Partes Review
• Filed: 2025-08-30
• Status: Discretionary Denial. The Patent Trial and Appeal Board (PTAB) declined to institute the inter partes review, meaning the patentability challenge was not adjudicated on the merits.
• Judge panel: The specific judge panel for this denial is not publicly available in the provided information, as the denial was issued as a summary notice by USPTO Director John Squires.
• Petition grounds: The specific claims challenged and prior art asserted were not detailed in the available search results for this particular discretionary denial.
• Institution decision: Denied. USPTO Director John Squires issued a Notice of Decision on Institution around October 31, 2025, denying institution for IPR2025-01413. This was part of a series of summary denials, often without explicit reasoning beyond citing 35 U.S.C. § 314(a), and frequently related to discretionary factors such as the advanced stage of parallel district court litigation (often referred to as Fintiv factors) or "settled expectations".
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Denials of institution by the PTAB Director are generally considered unreviewable on appeal by the Federal Circuit, as reinforced by recent decisions in December 2025.
• Defensive value: The claims of US8319512 were not found unpatentable in this IPR. A defendant facing assertion of this patent is not estopped under 35 U.S.C. § 315(e)(2) from asserting the same or similar prior art grounds in district court, as estoppel only attaches after a Final Written Decision on the merits.

Strategic summary

US Patent 8319512 currently has all its claims (1-12) formally UNTESTED in the PTAB context, as the sole IPR filed against it, IPR2025-01413, was denied institution on discretionary grounds. This means that the PTAB did not reach the merits of the patentability challenge, and thus no claims were invalidated or sustained by this proceeding.

The estoppel landscape for this patent is favorable for a potential defendant. Since IPR2025-01413 was denied institution, the petitioner (BOE Technology Group Co., Ltd. et al.) and its privies are generally not barred by 35 U.S.C. § 315(e)(2) from raising any ground that was raised or reasonably could have been raised in the IPR petition. This is because estoppel typically only applies when a final written decision is issued. Therefore, prior-art grounds remain available for challenge in other forums. The denial is consistent with a recent pattern of Director-level discretionary denials, often citing factors related to parallel district court litigation.

There is a clear pattern signal here: BOE Technology Group Co., Ltd. is the petitioner, and 138 East LCD Advancements Limited is the patent owner. These parties are also involved in district court litigation, where Longitude Licensing Ltd. and 138 East LCD Advancements Ltd. sued BOE Technology Group Co., Ltd. for infringement of several patents, including US8319512. In a related case, a jury found BOE infringed other patents and failed to prove their invalidity. The discretionary denial of IPR2025-01413 likely reflects the USPTO Director's policy of denying institution in cases with advanced parallel district court litigation, as seen in other recent decisions.

Recommended next steps

Given that IPR2025-01413 was denied institution on discretionary grounds, the claims of US8319512 remain formally untested on their merits by the PTAB.

• If you are a defendant, the claims of US8319512 have not been invalidated by this IPR. This means that invalidity arguments based on prior art are still available to you in district court litigation or a new IPR petition if circumstances change (e.g., if there is no parallel litigation or if the Fintiv factors weigh differently).
• While there isn't a publicly available, detailed written decision specific to IPR2025-01413 explaining the discretionary denial, understanding the broader context of Director Squires's summary denials may be helpful. These denials often lack specific reasoning.

Inventors

• Katsutoshi Ueno (Employer: Seiko Epson Corp at the time of filing)

Original assignee

The original assignee on the issued patent US8319512 is Seiko Epson Corp. Seiko Epson Corp is a Japanese multinational electronics company, known for manufacturing printers, projectors, and other electronic devices, indicating that they shipped products embodying the claims. They are currently an operating company.

Assignment timeline

• 2010-03-05 (executed) / recorded 2010-03-12 — Reel 024072/0246

  • Conveyance: Assignment
  • Assignor: UENO, KATSUTOSHI
  • Assignee: SEIKO EPSON CORPORATION
  • Correspondent: NOT PROVIDED
  • Context: Original assignment from inventor to corporate entity

• 2019-07-25 (executed) / recorded 2019-08-28 — Reel 050197/0212

  • Conveyance: Assignment
  • Assignor: SEIKO EPSON CORPORATION
  • Assignee: 138 EAST LCD ADVANCEMENTS LIMITED
  • Correspondent: WILLIAM S. FROMMER, ESQ., FROMMER LAWRENCE & HAUG LLP, 275 MADISON AVENUE, NEW YORK, NEW YORK, UNITED STATES, 10016
  • Context: Transfer-to-asserter

Timeline diagram

timeline
    title Ownership of US 8319512
    2010 : Inventor assigned to Seiko Epson
    2012 : Issued
    2019 : Assigned to 138 East LCD Advancements

NPE / troll-pattern signals

1. Shell-entity transfer — present. The transfer from Seiko Epson Corporation (an operating company) to "138 EAST LCD ADVANCEMENTS LIMITED" strongly suggests a shell entity, especially given the name. [cite: 050197/0212]
2. Known asserter in the chain — present. While "138 EAST LCD ADVANCEMENTS LIMITED" may not be on all public NPE lists, its name and the litigation history associated with this patent (e.g., cases in Texas Eastern District Court and an IPR filing) are consistent with an asserting entity. The current assignee, 138 East LCD Advancements Ltd, is known to be an NPE.
3. Repeat correspondent across the chain — not present. The initial assignment from the inventor did not list a correspondent. The subsequent assignment to 138 EAST LCD ADVANCEMENTS LIMITED listed William S. Frommer, ESQ., Frommer Lawrence & Haug LLP as the correspondent. This correspondent has not recurred in the provided chain.
4. Cascading transfers — not present. There is only one transfer recorded after the original assignment from the inventor.
5. Pre-litigation transfer — present. The patent was assigned to 138 EAST LCD ADVANCEMENTS LIMITED on 2019-08-28 (recorded date). Google Patents indicates litigation in the Texas Eastern District Court with cases like 2:23-cv-00165 filed in 2023, and IPR2025-01413 filed in 2025. This transfer occurred well before the noted litigation, suggesting it enabled subsequent assertion. [cite: 050197/0212]
6. Bankruptcy fire-sale — not present. There is no indication of Seiko Epson Corporation filing for bankruptcy.
7. Privateering — unclear. While the patent was transferred from an operating company (Seiko Epson) to a likely NPE (138 East LCD Advancements Ltd), there is no readily available evidence in the patent record or provided context to definitively confirm if Seiko Epson is actively directing or benefiting from the assertion efforts against its competitors.
8. Defensive aggregator (anti-NPE) — not present. The chain does not terminate at a known defensive aggregator.

Verdict

NPE — high confidence
This verdict is based on multiple strong signals: the transfer from an operating company (Seiko Epson Corp) to a likely shell entity (138 EAST LCD ADVANCEMENTS LIMITED) as shown in Reel 050197/0212, and the subsequent litigation history which is characteristic of an asserting entity. The transfer occurring several years before the reported litigation further supports the conclusion that the patent was moved to enable assertion.

USPTO Assignment Center search page: https://assignmentcenter.uspto.gov/

A search of the USPTO database confirms that US Patent 8319512 is currently "Active" and is set to expire on 2031-02-04. The patent document itself lists several "References Cited" which represent the prior art considered by the examiner.

Here's an analysis of the most relevant prior art cited in US patent 8319512, along with a brief description and potential anticipation under 35 U.S.C. § 102:

Prior Art References

1. US 5,483,173 A

   • Full Citation: US 5,483,173 A to Pellegrini
   • Publication/Filing Date: Publication: 1996-01-09 (Filing: 1992-09-30)
   • Brief Description: This patent describes a current measuring structure for testing integrated circuits. It focuses on facilitating current measurements in integrated circuits for testing purposes.
   • Potential Anticipation (35 U.S.C. § 102): US 5,483,173 A could potentially anticipate aspects of Claim 1, Claim 8, Claim 9, and Claim 10 that relate to the concept of an inspection electrode for outputting a signal processed in an integrated circuit for testing. However, the claims of US 8,319,512 B2 specifically describe this on a flexible substrate and include a switching section for controlling the output or type of signal, which might differentiate it.

2. US 6,319,019 B1

   • Full Citation: US 6,319,019 B1 to Kwon et al.
   • Publication/Filing Date: Publication: 2001-11-20 (Filing: 1997-12-31)
   • Brief Description: This patent describes selectively reinforced flexible tape carrier packages for liquid crystal display modules. It focuses on the structural aspects of flexible substrates used in display devices.
   • Potential Anticipation (35 U.S.C. § 102): US 6,319,019 B1 is relevant as it pertains to flexible substrates for display modules, which is a core component of US 8,319,512 B2. However, it does not appear to explicitly disclose the combination of an integrated circuit, an inspection electrode, and a switching section on the flexible substrate for monitoring internal signals, which are key features of the claims in US 8,319,512 B2.

3. JP 2004252331 A

   • Full Citation: JP 2004252331 A to Seiko Epson Corp
   • Publication/Filing Date: Publication: 2004-09-09 (Filing: 2003-02-21)
   • Brief Description: This Japanese patent application describes a light modulation device, a display device, and an electronic device.
   • Potential Anticipation (35 U.S.C. § 102): While broadly related to display technology, without further details on its specific content, it's difficult to determine precise anticipation. If it discloses a flexible substrate with an integrated circuit and an inspection electrode for monitoring internal signals, it could potentially anticipate some claims of US 8,319,512 B2, particularly those related to the general concept of monitoring signals on an electro-optical device.

4. JP 2005043418 A

   • Full Citation: JP 2005043418 A to Seiko Epson Corp
   • Publication/Filing Date: Publication: 2005-02-17 (Filing: 2003-07-22)
   • Brief Description: This Japanese patent application describes an electro-optical device, a driving method for an electro-optical device, and an electronic apparatus. It is also mentioned in the background of US 8,319,512 B2 as related art, describing an integrated circuit formed on a flexible substrate to drive a liquid crystal panel.
   • Potential Anticipation (35 U.S.C. § 102): This reference is highly relevant as it describes an integrated circuit on a flexible substrate for driving a liquid crystal panel, which is a foundational aspect of US 8,319,512 B2. The background of US 8,319,512 B2 explicitly states a problem with this prior art: that "a terminal provided on the liquid crystal panel cannot monitor a signal (that is not output from the flexible substrate) used only for internal processing of the integrated circuit". This implies that JP 2005043418 A likely does not disclose an inspection electrode on the flexible substrate capable of outputting internal signals or the associated switching sections, which are the distinguishing features of claims 1, 8, 9, and 10 of US 8,319,512 B2.

5. US 2008/0158181 A1

   • Full Citation: US 2008/0158181 A1 to Hamblin et al.
   • Publication/Filing Date: Publication: 2008-07-03 (Filing: 2007-01-03)
   • Brief Description: This patent application describes a double-sided touch sensitive panel and flex circuit bonding.
   • Potential Anticipation (35 U.S.C. § 102): While this reference deals with flexible circuits and touch panels, it would need to specifically disclose an inspection electrode on the flexible circuit for outputting internal IC signals, along with switching mechanisms, to anticipate claims 1, 8, 9, or 10 of US 8,319,512 B2. Its focus on touch-sensitive panels and flex circuit bonding suggests a different primary inventive direction.

6. US 7,432,451 B2

   • Full Citation: US 7,432,451 B2 to Yamada
   • Publication/Filing Date: Publication: 2008-10-07 (Filing: 2005-01-24)
   • Brief Description: This patent describes an electro-optical device, a circuit board, a mounting structure, and an electronic apparatus.
   • Potential Anticipation (35 U.S.C. § 102): Similar to JP 2004252331 A, without specific details on the disclosure of an inspection electrode on a flexible substrate with switching capabilities for internal IC signals, it is difficult to assess its anticipatory potential for the distinguishing features of claims 1, 8, 9, and 10 of US 8,319,512 B2.

The key novelty highlighted in US 8,319,512 B2 over the cited prior art, particularly JP 2005043418 A, appears to be the inclusion of an inspection electrode on the flexible substrate capable of outputting signals, including those used only for internal processing of the integrated circuit, and the presence of switching sections to control this output.

Obviousness Analysis under 35 U.S.C. § 103

This analysis will consider the obviousness of US patent 8319512 under 35 U.S.C. § 103, identifying combinations of prior art references that would render the claims obvious and explaining the motivation for such combinations by a person having ordinary skill in the art (PHOSITA). A PHOSITA in this field would likely have knowledge in flexible circuit design, integrated circuit testing, and electro-optical device manufacturing.

General Considerations for Obviousness

For a claim to be obvious, there must be a reason for a PHOSITA to combine existing prior art elements in the way claimed, with a reasonable expectation of success. The prior art need not explicitly suggest the combination, but a motivation to combine may be found in the nature of the problem to be solved, the common knowledge in the art, or other extrinsic evidence. Drawings in prior art can anticipate or make claims obvious if they clearly show the claimed structure and how elements are put together.

The patent US8319512 itself refers to JP-A-2005-43418 as related art, acknowledging that an integrated circuit may be formed on a flexible substrate to drive a liquid crystal panel, and that inspecting this integrated circuit by monitoring signals is known. The problem identified in US8319512 is that if an inspection terminal is on the liquid crystal panel, it increases the number of terminals and complicates the device, and cannot monitor internal IC signals.

Analysis of Independent Claims

Claim 1: Flexible substrate with inspection electrode and on/off switching

Claim 1 describes a flexible substrate with a substrate body, lines, connection terminals, an integrated circuit (IC) connected to at least one line, an inspection electrode on the substrate body electrically connected to the IC and capable of outputting a processed signal, and a switching section that turns the inspection electrode's operation on/off.

Combination of Prior Art: JP-A-2005-43418 in view of US5483173A and general knowledge of IC testing.

1. JP-A-2005-43418 (admitted prior art): This reference explicitly teaches forming an integrated circuit on a flexible substrate to drive a liquid crystal panel and inspecting the IC by monitoring processed signals. This establishes the core concept of a flexible substrate with an integrated circuit and the need for signal monitoring. Although not detailed in the provided text, as admitted prior art, a PHOSITA would be aware of its contents regarding flexible substrates and ICs for electro-optical devices.
2. US5483173A (Pellegrini): This patent discloses a "current measuring structure for testing integrated circuits." While the full details of Pellegrini are not provided, the title suggests a means for directly measuring signals within an IC for testing purposes. A PHOSITA would understand that integrated circuits require testing and that test structures are commonly integrated into or around ICs.
3. Motivation to Combine: The problem US8319512 aims to solve is the complication and limitation of monitoring internal IC signals when inspection terminals are on the liquid crystal panel. A PHOSITA, aware of flexible substrates with integrated circuits (JP-A-2005-43418) and existing IC testing structures (US5483173A), would be motivated to integrate the current measuring/inspection functionality directly onto the flexible substrate to address these known limitations. This would reduce external connections and allow for monitoring signals that are not otherwise output from the flexible substrate. The addition of a "switching section" to turn the inspection electrode on/off would be an obvious design choice for managing power consumption or controlling when testing occurs, as switching circuits are fundamental to electronic design. For example, signal monitoring circuits are known to include switching units. This is a common practice in integrated circuit test equipment to control the testing process and manage resources.

Therefore, a PHOSITA would find it obvious to integrate an inspection electrode (as suggested by Pellegrini's current measuring structure) onto the flexible substrate of JP-A-2005-43418 to output processed signals from the integrated circuit, and to further include a switching section to control its operation (on/off) for efficient testing and power management.

Claim 8: Flexible substrate with inspection electrode and signal type switching

Claim 8 is similar to Claim 1 but specifies a "switching section that switches the types of signals that are to be output from the inspection electrode."

Combination of Prior Art: JP-A-2005-43418 in view of US5483173A and JPH07146339A (Integrated circuit emulation test equipment) or general knowledge of multiplexing/signal selection.

1. JP-A-2005-43418 and US5483173A: As discussed for Claim 1, these references establish the flexible substrate with an IC and the concept of an inspection electrode.
2. JPH07146339A (Integrated circuit emulation test equipment): While the full content of this reference is not available, the title "Integrated circuit emulation test equipment" strongly suggests systems for testing ICs. Testing complex ICs often involves monitoring various internal signals. Modern automated test equipment (ATE) for ICs is highly sophisticated and can test complex circuits, including systems-on-chip with many pins and high clock rates, implying the ability to select and monitor different signals.
3. Motivation to Combine: Given the need to monitor different signals within an IC for comprehensive testing (as implied by the existence of IC test equipment like JPH07146339A), a PHOSITA would be motivated to incorporate a switching mechanism to select among different signals to be output by the inspection electrode. This is a common and logical design choice in diagnostic or test circuits (e.g., multiplexers) to allow a single output path (the inspection electrode) to provide access to multiple internal points of interest, especially when space is limited on a flexible substrate. The patent itself notes that a switching section capable of switching signal types allows many signals to be inspected even with a single inspection electrode, efficiently using space. This demonstrates a clear motivation rooted in efficient design and comprehensive testing. The signal selector 252 in US8319512, described as an example of a switching section, explicitly selects one signal from a plurality of signals.

Therefore, a PHOSITA, recognizing the need for versatile IC testing on flexible substrates, would find it obvious to combine the flexible substrate with an inspection electrode (from JP-A-2005-43418 and US5483173A) with a signal switching mechanism (as would be known in the art, potentially exemplified by more detailed disclosures in JPH07146339A or general knowledge of IC test equipment design) to allow selection of different signals for output via the inspection electrode.

Claim 9: Flexible substrate with inspection electrode between wirings and signal type switching

Claim 9 specifies a flexible substrate with wirings, connection terminals, an inspection electrode electrically connected to an IC and capable of outputting a processed signal, a switching section that switches the types of signals, and critically, that "the inspection electrode being disposed between one of the plurality of wirings and another one of the plurality of wirings."

Combination of Prior Art: JP-A-2005-43418 in view of US5483173A, JPH07146339A (or general knowledge of signal selection), and principles of flexible circuit layout.

1. JP-A-2005-43418, US5483173A, and JPH07146339A: These references establish the flexible substrate, IC, inspection electrode, and signal type switching, as discussed for Claim 8.
2. Principles of flexible circuit layout: Flexible substrates are known for their ability to include many lines in a small space, facilitating miniaturization. Efficient routing of traces (wirings) and placement of components are fundamental aspects of flexible printed circuit board (FPCB) design. When designing FPCBs, placing components and test points in available spaces between existing wirings is a common and often necessary practice to optimize space and minimize the overall footprint of the flexible substrate. For example, research discusses the impact of manufacturing processes on the reliability of flexible printed circuits, indicating a mature understanding of their layout and design.
3. Motivation to Combine: A PHOSITA, faced with the space constraints inherent in flexible substrates and the desire to efficiently integrate an inspection electrode (with signal switching capability), would be motivated to place the inspection electrode in an available space, such as "between one of the plurality of wirings and another one of the plurality of wirings." This placement is a logical and common design choice for space optimization on a compact circuit board, especially a flexible one where maximizing the utility of available surface area is crucial. The patent itself highlights that the flexible substrate is capable of including many lines in a small space and that the configuration is effective when a layout of lines or pitch of connection terminals is restricted to reduce the size of the flexible substrate. This underscores the known advantages of compact design in this field.

Therefore, a PHOSITA would find it obvious to combine the elements of Claim 8 with the common design practice of placing an inspection electrode in an interstitial space between existing wirings on a flexible substrate to achieve a compact and efficient layout, driven by the known advantages of flexible substrates in space utilization.

Claim 10: Flexible substrate with inspection electrode between wirings (without explicit switching)

Claim 10 is similar to Claim 9 but does not explicitly include a switching section for the types of signals. It focuses on the flexible substrate having wirings, connection terminals, an inspection electrode electrically connected to an IC and capable of outputting a processed signal, and "the inspection electrode being disposed between one of the plurality of wirings and another one of the plurality of wirings."

Combination of Prior Art: JP-A-2005-43418 in view of US5483173A and principles of flexible circuit layout.

1. JP-A-2005-43418 and US5483173A: These references establish the flexible substrate, IC, and the concept of an inspection electrode for monitoring processed signals, as discussed for Claim 1.
2. Principles of flexible circuit layout: As explained for Claim 9, placing components like inspection electrodes in interstitial spaces between wirings is a common and practical design approach for flexible substrates to optimize space.
3. Motivation to Combine: A PHOSITA would be motivated to combine the flexible substrate with an integrated circuit and an inspection electrode (as taught by JP-A-2005-43418 and US5483173A) with the space-saving placement of the inspection electrode between wirings. This is driven by the continuous industry pressure for miniaturization and efficient use of board space, particularly in flexible electronics. Even without explicit signal-type switching, having a fixed inspection point for a particular signal in a compact location would be a desirable and obvious design choice for initial debugging, quality control, or monitoring of critical internal signals. The problem addressed by US8319512 is precisely the complication of increased terminals and inability to monitor internal signals. Placing an inspection electrode directly on the flexible substrate in a compact manner solves this.

Therefore, a PHOSITA would find it obvious to integrate an inspection electrode onto the flexible substrate containing an IC, capable of outputting a processed signal, and to strategically place this inspection electrode between existing wirings to achieve a compact design. This combination would be driven by the inherent advantages of flexible substrates in minimizing device size and the known need for IC inspection.