ITO Transparent Thin Film Transistor Patents 2026
ITO Transparent Thin Film Transistor Patents 2026
Indium tin oxide and related indium-based transparent conducting oxide materials sit at the intersection of display electronics, photovoltaics, and flexible device architectures. This dataset spans 70+ retrieved records from 2001 to 2025 across magnetron sputtering, ALD, and multi-component oxide channel TFT innovations.
ITO Transparent TFT: Three Coupled Sub-Domains
The ITO transparent TFT field encompasses three tightly coupled sub-domains: engineering of ITO and alternative indium-based TCO films as transparent electrodes; design of multi-component oxide channel semiconductors such as IGZO, ITZO, and IGZTO; and deposition process innovation—primarily magnetron sputtering and atomic layer deposition—to achieve low-temperature, large-area fabrication on rigid and flexible substrates.
Indium's 5s-orbital overlap underpins high electron mobility in both conductive and semiconducting oxide phases. ITO films (typically 90 wt% In₂O₃ / 10 wt% SnO₂) serve as transparent electrodes for gate, source, and drain contacts, while multicomponent oxide semiconductors such as amorphous IGZO or ITZO serve as channel layers. Several patents in this dataset employ ITO or ITO-like compositions as both electrode and channel material within homojunction or all-oxide TFT architectures.
The dataset spans publication dates from 2001 to 2025, revealing distinct generational layers: early foundations establishing ITO deposition processes (2001–2007), a scale-up and commercialization phase dominated by Korean and Japanese display manufacturers (2008–2015), a performance engineering era in which Chinese universities became increasingly prominent (2016–2022), and a current edge defined by quasi-superlattice channels, low-temperature flexible fabrication, and low-indium TCO films (2023–2025).
In this dataset, ITO target and film engineering is moderately concentrated among Japanese and Korean assignees, with Sumitomo Metal Mining Co., Ltd. holding 6 patents and Samsung Corning Advanced Glass / Precision Materials holding 5 patents in retrieved records. TFT device architecture innovation is more distributed, spanning Korean industry leaders, Korean and Taiwanese academia, Chinese universities, and emerging Chinese manufacturers.
Filing Trends and Technology Cluster Distribution
Analysis of retrieved records reveals both temporal filing momentum and a clear concentration of patents across four core technology clusters: ITO electrode target engineering, multi-component oxide channel semiconductors, transparent electrode architectures in all-oxide TFTs, and alternative low-indium TCO films.
Patent Count by Technology Cluster (Retrieved Records)
In this dataset, the ITO electrode/target engineering cluster is the most patent-dense, followed by multi-component oxide channel semiconductors; the two newest clusters — all-oxide TFT electrode architectures and low-indium TCO alternatives — show fewer but more recent filings.
↗ Click bars to exploreFiling Activity by Era — ITO Transparent TFT Retrieved Records
In this dataset, the 2016–2022 era shows the highest filing volume in retrieved records, reflecting growing Chinese university and manufacturer activity alongside continued Korean display-maker filings; the 2023–2025 cohort, though smaller in absolute count, includes the highest proportion of CN-jurisdiction filings.
↗ Click bars to exploreKey Application Areas for ITO Transparent TFT Technology
Retrieved patents and literature span six distinct application domains, from flat panel display backplanes to aerospace glazing. Each domain imposes distinct requirements on ITO film conductivity, transmittance, and process compatibility.
Flat Panel Displays — LCD, OLED
This is the dominant application in the dataset. LG Display's 2023 US patents specify dual-layer FIZO/IGZO TFTs for ultra-high-definition display gate drivers, and five-component In-Ga-Zn-Sn-O channel TFTs filed in 2018 (US) and 2019 (EP). Samsung Display's 2014–2015 US patents cover single-phase IZTO channel TFTs with mobility of 10–40 cm²/V·s for high-frame-rate display backplanes.
Display BackplanePhotovoltaics — Heterojunction Solar Cells
ITO and ITO-alternative TCO films appear as transparent front-contact electrodes for heterojunction silicon (HJT) solar cells. Guangdong Olike Advanced Materials (2025 CN) targets low-indium ZnO:In TCO with 2–25 wt% In₂O₃ to reduce material cost. Samsung Electronics' NIR-transparent ITO (2017 US) achieves carrier mobility >30 cm²/V·s and carrier concentration ~10²⁰/cm³, targeting photovoltaic applications requiring both visible and NIR transmission.
Solar TCO ElectrodeOLEDs and Organic Electronics
Sumitomo Metal Mining Co., Ltd. filed extensively (2003–2007, US) on silicon-doped and W/Mo-doped indium oxide TCO films as transparent electrode substrates for OLED panels, claiming low specific resistance (≤6×10⁻⁴ Ω·cm) and thermal stability at 170°C. Toyobo Co., Ltd. holds active EP and US patents (2018–2021) on crystallinity-controlled ITO films on plastic substrates, directly targeting flexible OLED and touch sensor applications.
OLED ElectrodeAerospace Transparencies and Glazing
PPG Industries Ohio, Inc. holds an active cross-jurisdictional patent family (US, CA, WO; 2015, 2025) on multi-layer moving-target sputtered ITO specifically for aircraft transparencies such as windshields and canopies. The patented films achieve sheet resistance <0.5 Ω/□, enabling de-icing, electromagnetic shielding, and anti-icing functionality while maintaining optical clarity for aerospace applications.
Specialty GlazingLeading Patent Assignees in ITO Transparent TFT — Dataset Snapshot
In this dataset, Sumitomo Metal Mining Co., Ltd. holds the highest filing count with 6 patents covering Si/W/Mo-doped ITO TCO targets and films, followed by Samsung Corning Advanced Glass and Precision Materials with 5 patents in retrieved records. PPG Industries Ohio, Inc. and LG Display Co., Ltd. each hold 4 patents, representing distinct technology segments — specialty aerospace ITO coatings and multi-component oxide TFT channels, respectively.
Top Assignees by Filing Count — ITO Transparent TFT (Dataset Snapshot)
↗ Click bars to exploreSumitomo Metal Mining Co., Ltd.
Sumitomo Metal Mining holds 6 patents in this dataset, the highest filing count in retrieved records, filed in the US and CA between 2003 and 2007. Their filings cover silicon-doped and W/Mo-doped indium oxide transparent conductive films as transparent electrode substrates for display panels and OLED devices, claiming low specific resistance (≤6×10⁻⁴ Ω·cm) and thermal stability at 170°C. These patents establish the sintered target and sputtering paradigm that underpins the broader ITO TCO cluster.
Japan — JPLG Display Co., Ltd.
LG Display Co., Ltd. holds 4 patents in this dataset filed in US and EP between 2018 and 2025 in retrieved records. Their filings cover five-component In-Ga-Zn-Sn-O oxide channel TFTs (2018 US, 2019 EP), dual-layer FIZO/IGZO TFTs for ultra-high-definition display gate drivers (2023 US), and quasi-superlattice active layers alternating indium zinc oxide and gallium oxide (2023 US). The 2025 US filing on In-Ga-Zn-Sn-O is listed as active, reflecting ongoing IP prosecution in next-generation display backplane technology.
South Korea — KRFive Emerging Technology Directions (2023–2025 Filings)
The most recent filings in this dataset (2023–2025) reveal five distinct technology directions that represent departures from the established single-phase amorphous oxide channel paradigm, reflecting both performance pressures from next-generation displays and strategic responses to indium supply-chain risk.
Quasi-Superlattice and Multi-Layer Channel Architectures
LG Display's 2023 US patent on TFTs with alternating indium zinc oxide / gallium oxide quasi-superlattice active layers represents a departure from single-phase amorphous oxide channels, targeting higher mobility with improved stability through bandgap engineering at the sub-nanometer scale. A separate 2023 LG Display US patent covers dual-layer FIZO/IGZO TFTs for ultra-high-definition display gate drivers. Shenzhen Shangding Core Technology Co., Ltd.'s 2025 CN pending patent introduces MBE-grown indium-concentration-gradient IGZO films with an ITO interlayer between the active layer and source/drain contacts as an ohmic contact management layer.
High-Mobility Rare-Earth-Doped IGZO Composites
Zhangzhou Heqi Target Science and Technology Co., Ltd.'s 2025 CN active patent on terbium-doped IGZO (IGZTBO) composite TFTs demonstrates China's push toward proprietary multicomponent oxide formulations, specifically citing low off-state current for display applications. This filing represents a direct competitive challenge to established Japanese and Korean IGZO IP positions. The use of rare-earth dopants such as Tb follows the same strategic logic as earlier rare-earth-doped ITO targets (Sm₂O₃/Yb₂O₃ by Samsung Corning), now applied to the channel semiconductor layer.
ITO Electrode Films vs. Multi-Component Oxide Channel TFTs
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| Dimension | ITO Electrode / Target Engineering | Multi-Component Oxide Channel TFTs |
|---|---|---|
| Primary Material | In₂O₃ (90 wt%) + SnO₂ (10 wt%); dopants include Sm₂O₃, Yb₂O₃, Ga, Si, W, Mo, Ca | IGZO, ITZO, IGZTO, IZTO, FIZO/IGZO bilayer; In content > Ga in multi-component formulations |
| Key Performance Metric | Sheet resistance <0.5 Ω/□ (PPG, 2025); carrier mobility >30 cm²/V·s; carrier concentration ~10²⁰/cm³ (Samsung Electronics, 2017) | Field-effect mobility up to 50 cm²/V·s; on/off ratio 10⁸; sub-threshold swing 0.2 V/decade (Shandong University ITZO, 2014) |
| Primary Deposition Method | RF or DC magnetron sputtering from sintered ITO target; multi-layer moving-target sputtering (PPG) | RF magnetron sputtering from multi-component oxide targets; ALD for In₂O₃ channel layers; solution processing (ZrO₂/La₂O₃ gate dielectric) |
| Key Application | Flat panel display electrodes; OLED transparent anodes; aerospace anti-icing glazing; HJT solar cell front contacts | TFT-LCD and AMOLED backplane switching elements; UV photodetectors; flexible AMOLED rollable screen drivers |
| IP Maturity | Mature; layered families from Samsung Corning, Sumitomo Metal Mining, PPG back to 2001–2008; new entrants must navigate established estates | Active battleground; most recent and commercially significant filings concentrated here; significant 2023–2025 CN activity |
| Leading Assignees (Dataset) | Sumitomo Metal Mining (6 patents), Samsung Corning Advanced Glass / Precision Materials (5 patents), PPG Industries Ohio (4 patents) | LG Display Co. (4 patents), Samsung Display Co. (2 patents), ULVAC Inc. (2 patents), Zhangzhou Heqi Target (1 patent, 2025) |
| Process Temperature | Room temperature to ~300°C; Toyobo patents target crystallinity-controlled ITO on plastic at reduced temperature | <200°C for flexible polymer substrate compatibility (Shandong University, 2023 CN) |
| Indium Supply Risk | High; 90 wt% In₂O₃ standard; Guangdong Olike (2025) targets 2–25 wt% In₂O₃ / ZnO as lower-indium alternative | Moderate; multi-component formulations dilute In content; rare-earth and Ti co-doping studied as partial substitutes |
Frequently Asked Questions: ITO Transparent TFT Patents
The highest field-effect mobility reported in retrieved records is 50 cm²/V·s, achieved by an indium-zinc-tin oxide (ITZO) homojunction TFT developed by Shandong University (Weihai) in a 2014 CN patent. The same device demonstrated an on/off ratio of 10⁸ and a sub-threshold swing of 0.2 V/decade.
In this dataset, Sumitomo Metal Mining Co., Ltd. holds the highest filing count with 6 patents, covering silicon-doped and W/Mo-doped indium oxide transparent conductive films and sintered targets for display and OLED applications. Samsung Corning Advanced Glass and Precision Materials collectively hold 5 patents in retrieved records.
The dominant deposition method across retrieved records is RF or DC magnetron sputtering from sintered ITO or multi-component oxide targets. PPG Industries uses a multi-layer moving-target sputtering approach. Atomic layer deposition (ALD) appears in literature records for In₂O₃-based TFT channel layers, and solution processing is noted in Xi'an Jiaotong-Liverpool University's 2023 CN patent on ZrO₂/La₂O₃-based TFTs.
Two 2025 CN pending patents directly address indium cost and supply-chain risk. Guangdong Olike Advanced Materials targets low-indium ZnO:In TCO films using sputtering targets with only 2–25 wt% In₂O₃ for heterojunction solar cell front contacts. China Building Materials Glass New Materials Research Institute Group targets visible and NIR dual-band high-transmittance TCO films as alternatives for solar applications.
Retrieved records span six application domains: flat panel displays (LCD, AMOLED, OLED), photovoltaics (heterojunction silicon solar cells), organic light-emitting devices, UV photodetectors and LED devices, flexible and wearable electronics, and aerospace specialty glazing. Flat panel displays are the dominant application by patent count in this dataset.
Five emerging directions are identified from 2023–2025 filings in retrieved records: (1) quasi-superlattice and multi-layer oxide channel architectures (LG Display, 2023 US); (2) high-mobility terbium-doped IGZO composites (Zhangzhou Heqi Target, 2025 CN); (3) dual-layer gradient-composition IGZO TFTs with ITO interlayer (Shenzhen Shangding, 2025 CN); (4) low-indium and indium-free TCO films for solar cells (Guangdong Olike, 2025 CN); and (5) low-temperature (<200°C) flexible TFT fabrication on polymer substrates (Shandong University, 2023 CN).
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.