OLED Mura & Defect Inspection Patent Snapshot
The OLED Mura and defect inspection space is a compact, China-dominated field where LG Display leads among display makers but Chinese equipment and panel firms collectively control the bulk of activity. Annual volume has eased from its 2019 peak, signalling a mature-to-declining phase where differentiation in adjacent detection and metrology branches may offer the clearest entry paths.
LG Display leads a fragmented, China-centric field
LG Display Co Ltd holds the top position among ranked applicants, followed closely by Wuhan Tianma Micro Electronics and Tianma Micro Electronics, each with 4 patent records. The ranking is shallow: at least a dozen applicants are tied at 2 patent records each, indicating no single player commands a visible share.
The top five filers account for 29% of the combined total among the ranked applicants visible in this query — a modest concentration for a specialised inspection niche. This flat distribution means no applicant has erected a decisive barrier, and new entrants face a relatively open visible assignee structure at the filing level.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | LG Display Co Ltd | 5 | |
| 2 | Wuhan Tianma Micro Electronics Co Ltd | 4 | |
| 3 | Tianma Micro Electronics Co Ltd | 4 | |
| 4 | Guilin Machine Tool Electric Co Ltd | 2 | |
| 5 | Jihua Lab | 2 | |
| 6 | Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd | 2 | |
| 7 | BEIJING C&W ELECTRONICS GRP | 2 | |
| 8 | Zhaoqing Zhongdao Optoelectronics Equipment Corporation | 2 | |
| 9 | Advanide Holdings Pte Ltd | 2 | |
| 10 | Jiangsu Heyi Optoelectronic Display Technology Co Ltd | 2 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Wuhan Tianma Microelectronics Co Ltd Shanghai Branch | 2 | |
| 12 | Micronic Laser Systems AB | 2 | |
| 13 | Beijing Luster LightTech Co Ltd | 2 | |
| 14 | TCL China Star Optoelectronics Technology Co Ltd | 2 | |
| 15 | BEIJING C&W TECH DEV | 1 | |
| 16 | Shenzhen Wanzhonghe Technology Co Ltd | 1 | |
| 17 | Suzhou GACII Optoelectronic Technology Co Ltd | 1 | |
| 18 | Sichuan Xinfudong Technology Co Ltd | 1 | |
| 19 | Vision Optics Co Ltd | 1 | |
| 20 | Beijing Focusight Technology Co Ltd | 1 |
LG Display’s position reflects a display-maker perspective on in-panel detection and driving-circuit diagnostics, while the cluster of Chinese equipment and optics companies signals that the inspection-tool supply chain is increasingly filing domestically. The gap between the leader and the tier below is only one patent record, underscoring fragmentation.
Patent publications from the most recent 18–24 months are typically under-counted due to publication lag; the 2025–2026 figures should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2019 and 2025 shows a late spike; material testing dominates the technology mix
The filing trend chart reveals an irregular pattern with a pronounced peak in 2019 and an apparent secondary spike in 2025, while the technology composition chart shows G01N material analysis and G09G display control circuits together accounting for the majority of classified records.
Annual filing trend
Filings peaked at 7 in 2019, dipped sharply in 2020, recovered partially in 2021, then settled at 3 per year through 2022–2024. The 2025 figure of 8 should be read cautiously given publication lag; the lifecycle evidence characterises the field as declining on a multi-year basis. The 2026 figure of 1 is almost certainly incomplete.
↗ Hover for values · click a bar to ask EurekaTechnology composition
G01N (material analysis and testing) is the visible IPC class with 26 patent records, followed by G09G (display control circuits) at 22 — together reflecting the two main technical approaches: optical/physical inspection and circuit-level diagnostics. G06T image processing at 9 records is the third pillar, indicating growing use of computational vision. G01M, H10K, and G01B each hold single-digit shares, marking them as comparatively sparse branches.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Panel defect detection method and organic light-em…
A panel defect detection method and an organic light emitting display device. A region having a high probability of a panel defect is intensively sensed through panel defect detection based on sensing results of characteristic values according to subpixels on sensing subpixel lines in an amount equal to the number of sensing subpixel lines preset in… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Panel defect detection method and organic light-em… | 35 |
| 2 | OLED显示装置驱动电路缺陷检测方法 | 27 |
| 3 | 检测图案误差的方法和装置 | 27 |
| 4 | OLED像素驱动电路、静电释放保护电路及检测方法 | 26 |
| 5 | OLED pixel driving circuit, electrostatic discharg… | 23 |
| 6 | 面板缺陷检测方法和使用该方法的有机发光显示装置 | 21 |
| 7 | 一种面向OLED屏像素缺陷检测的方法及装置 | 20 |
| 8 | OLED面板显示缺陷修复方法 | 19 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
LG Display Co Ltd
LG Display holds 5 patent records — the largest single-applicant count in the ranked field. Its technology emphasis is concentrated in G09G 3 (display control circuits, 5 records) and H10K 59 (organic semiconductors, 2 records), reflecting a panel-maker’s approach of embedding defect detection within driving circuitry rather than relying on external inspection tools. No momentum data places LG Display in the recent-entrant category, implying an established but not rapidly growing position.
patent records: 5Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd
With 2 patent records and a trend flagged as a new entrant, Suzhou Lingyunguang Industrial Intelligent Technology is the field’s clearest momentum story. Its focus spans G01N 21 (optical material analysis, 2 records) and G06T 7 (image data processing, 2 records), positioning it as an equipment-side player pursuing machine-vision-based inspection rather than in-panel diagnostics. Its co-filing relationship with Lingyunguang Technology suggests a coordinated group strategy.
patent records: 2Frequently asked questions
The corpus in scope contains 35 patent families. This is a compact specialised field, and the actual universe may be larger depending on search scope and classification choices.
LG Display Co Ltd holds the most patent records among ranked applicants with 5, followed by Wuhan Tianma Micro Electronics and Tianma Micro Electronics each with 4 patent records.
The lifecycle evidence classifies the field as Decline, with annual volume easing back from its 2019 peak and a recent-window growth rate of -36%. The apparent 2025 spike should be treated cautiously given publication lag.
China is the visible jurisdiction with 36 patent records, followed by the United States with 10, South Korea with 3, and WIPO PCT with 1.
G01N material analysis and testing (26 patent records) and G09G display control circuits (22 patent records) together represent the two main approaches: optical/physical inspection and circuit-level diagnostics. G06T image data processing (9 records) is the third significant pillar.
Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd is flagged as a new entrant in the momentum data, with 2 recent patent records focused on optical inspection (G01N 21) and image processing (G06T 7). No other applicant in the evidence shows a comparable recent-period acceleration.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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