Backlight Optical Films and Light Guide Patents: Top Companies & Trends 2026
- Concentrated at the top. The five leading assignees together hold 49.2% of all 8,764 records in scope, and the leading ten hold 63.4% — a small group controls most of the filed claim space.
- Filing has cooled from its 2017 peak. Volume peaked at 629 records in 2017; from 2021 to 2024, the last year treatable as complete, filings fell 29% (270 to 191).
- Semiconductor and optical-control classes dominate. H01L appears on 51.4% of records and G02F on 29.8%, showing most filings frame the light guide or film as part of a semiconductor or optical-modulation system rather than a standalone optical component.
Filing growth compares 2021 (270 records) with 2024 (191) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 8,764 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Backlight optical films and light guide plates sit at the mechanical and optical core of LCD and hybrid display modules: the components that take light from an edge- or bottom-mounted source and turn it into a uniform, controllable sheet of illumination behind the panel. Patent activity in this space covers light guide plate geometry, prism sheet and diffuser film design, dot pattern and light-extraction structures, and increasingly viewing angle control films that let a single backlight serve both public and privacy-mode viewing. The search underlying this page combines these physical components with the functional outcomes assignees actually claim against — luminance uniformity, moire suppression, film thickness reduction and light extraction efficiency.
The 8,764 records in scope span 2015 through the 2026 data cut-off, with the most recent one to two years understated because publication typically lags filing by roughly 18 months.
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Filing trend and technology composition
Two views of the same 8,764-record set: how filing volume has moved year over year, and which IPC subclasses the records are classified under.
A 2017 peak, then a multi-year pullback
Filings hit 629 in 2017 and have not returned to that level since. Comparing 2021 (270) to 2024 (191) — the last year the dataset treats as complete — volume is down 29%. Years after 2024 show far fewer records, but that reflects publication lag rather than a real drop in filing activity.
Semiconductor and optical-control classes lead
H01L (semiconductor devices) appears on 51.4% of the 8,764 records, ahead of G02F (optical control and modulation) at 29.8% and F21V (lighting device components) at 26.1%. Because a single record can carry several IPC classes, these shares add up to more than 100%; the pattern still shows most filings are framed as integrated device or optical-system claims rather than isolated film or plate structures.
Shares are the percentage of the 8,764 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Backlight Optical Films and Light Guides with Eureka
This page is one run against one query. Ask Eureka your own question about backlight optical films and light guides and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited prior art and a representative recent filing
US20230288753A1 — Backlight module and display apparatus (Coretronic, 2023-09-14)
A backlight module including a first light guide plate, a first light source, a diffusor, a second light guide plate, a second light source, a viewing angle control film, and a first prism sheet is provided. The diffusor sits on one side of the first light guide plate's emitting surface; the second light guide plate sits against the first plate's bottom surface, with its own emitting surface facing that bottom surface and its own light source at its incident edge. The viewing angle control film is placed between the two light-emission paths, allowing the module to switch or blend wide and narrow viewing modes from a single stacked assembly.Abstract trimmed for length; see the source record for the full claim set.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100084966A1 | Organic electroluminescent element, display device and lighting device | 745 |
| 2 | US20140367633A1 | LED display with wavelength conversion layer | 600 |
| 3 | US20140183503A1 | Light-Emitting Element, Light-Emitting Device, Electronic Appliance, and Lighting Device | 595 |
| 4 | US8033706B1 | Lightguide comprising a low refractive index region | 330 |
| 5 | US20060056166A1 | Enhanced LCD backlight | 292 |
| 6 | US20120235891A1 | Liquid crystal display device | 291 |
| 7 | US20210112647A1 | Angularly varying light emitting device with an imager | 274 |
| 8 | US7001058B2 | Ultra-thin backlight | 254 |
| 9 | US20090102763A1 | Display device with capture capabilities | 242 |
| 10 | US8773012B2 | Phosphor, method for preparing and using the same, light emitting device package, surface light source appara… | 236 |
Citation counts inside a searched corpus favour older records; treat them as a signal of influence on the field, not as a measure of current commercial relevance.
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Browse MCP servers →What the numbers mean for a filing decision
Three findings from the dataset that matter more for strategy than the raw ranking does.
A small group controls most of the claim space
The five leading assignees hold 49.2% of all 8,764 records in scope, and the leading ten hold 63.4%. New entrants filing core light guide plate or prism sheet geometry claims are filing directly against dense prior art held by a handful of large display and semiconductor manufacturers.
Volume has pulled back from its 2017 high
Filings peaked at 629 in 2017 and have declined since; the 2021-to-2024 comparison, the most recent span the dataset treats as complete, shows a 29% drop. This signals a maturing, well-occupied claim space rather than a technology in early growth.
Most filings frame the film or plate as part of a device
H01L (semiconductor devices) is the most common IPC subclass at 51.4% of records, ahead of G02F optical control at 29.8%. Filers are largely claiming light guides and films as part of an integrated display or lighting device, not as standalone optical components.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to backlight optical films and light guides, with the prior art for and against each one.
Who is filing, and where recent activity is thinning
The ranking spans 100 companies counted by patent family. Recent-year momentum figures show year-over-year change for the latest filing year, which is still incomplete because of publication lag.
One assignee sits well ahead of the field
The leading assignee holds 1,268 records, well clear of the fifth-place holder at 490 and the tenth-place holder at 132 — a steep drop-off rather than a gradual one.
Momentum is thinning across the leaders, not just one firm
Several of the largest assignees show sharp year-over-year declines in the most recent filing year, from roughly -60% to -94%. Some of this is real pullback; some is the latest year still being published. Either way, the leaders are not currently filing at their historical pace.
Co-filing is limited and mostly internal
Only ten co-assignee pairs appear in the dataset, and the strongest links are between a single company and its own named inventors rather than between separate corporate entities — cross-company joint filing is rare in this field.
| Assignee | Recent year | YoY |
|---|---|---|
| Samsung Electronics Co., Ltd. | 2 | -94% |
| Nichia Corporation | 2 | -67% |
| Seoul Viosys Co., Ltd. | 2 | -60% |
| Semiconductor Energy Laboratory Co., Ltd. | 1 | -88% |
| LG Display Co., Ltd. | 1 | -93% |
| Sony Group Corporation | 1 | -50% |
| LG Innotek Co., Ltd. | 0 | -100% |
| Samsung Display Co., Ltd. | 0 | -100% |
Where to take this next
The dataset points to a few concrete next steps for teams deciding where to file or what to design around.
Map claims against the leading ten assignees
With 63.4% of the 8,764 records held by ten companies, any new filing in core light guide plate or prism sheet geometry should be checked against their specific claim scope before drafting.
Explore assignee claims in Eureka →Test the under-claimed branches
Viewing angle switching, moire suppression and ultra-thin extraction films show thinner filing density than the core categories — worth a freedom-to-operate check before assuming the space is open.
Run a white space search in Eureka →Track the post-2024 filing years as they fill in
Because publication lags filing by roughly 18 months, the apparent drop after 2024 is partly an artefact of timing. Re-check the trend once 2025 and 2026 records finish publishing.
Set up a filing alert in Eureka →Common questions about this landscape
Filing in this space is concentrated: the five leading assignees together hold 49.2% of the 8,764 records in scope, and the leading ten hold 63.4%. The top-ranked assignee alone holds 1,268 records, well ahead of the fifth-place holder at 490 and the tenth-place holder at 132. This means a small group of large display and semiconductor manufacturers controls most of the filed claim space, and any new entrant needs to check its specific portfolios before drafting core geometry or extraction-structure claims.
Filing peaked at 629 records in 2017 and has not returned to that level since. Comparing 2021 (270 records) to 2024 (191 records) — the most recent year the dataset treats as complete — volume is down 29%. Years after 2024 show far fewer records, but that reflects an 18-month-or-so publication lag rather than an actual collapse in activity, so the trend should be read as a pullback from a 2017 high rather than a currently accelerating decline.
The dataset's records carry several IPC subclasses at once, most commonly H01L (semiconductor devices, 51.4% of the 8,764 records), G02F (optical control and modulation, 29.8%) and F21V (lighting device components, 26.1%). Smaller but meaningful shares fall under G02B optical elements (14.3%) and H10K organic semiconductors including OLED (6.9%). The pattern shows most filers frame their light guide or film claims as part of an integrated display or lighting device rather than as a standalone optical component.
Co-assignee collaboration is thin — only ten co-assignee pairs appear across the dataset, and the strongest are internal to a single company rather than cross-firm partnerships. Combined with recent-year filing momentum dropping sharply (roughly -60% to -94% year-over-year) across several major assignees, this suggests branches like stacked dual light guide viewing-angle switching, moire suppression through dot-pattern randomisation, and ultra-thin light extraction films carry thinner filing density than the core prism sheet and light guide geometry claims. These are worth a targeted freedom-to-operate check rather than assumed to be open.
US20230288753A1, filed by Coretronic and published 2023-09-14, describes a backlight module stacking two light guide plates with their own light sources, a diffuser, a viewing angle control film positioned between the two light paths, and a first prism sheet. The structure lets a single module switch or blend wide and narrow viewing modes rather than requiring separate hardware for each mode. It illustrates the current trend toward multi-function, stacked backlight assemblies rather than single-purpose light guide plates.
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.