Marubeni has been granted a patent for a display device that includes a backlight unit emitting primary light, a liquid crystal display module with sub-pixels containing phosphor and non-phosphor films. The phosphor film converts light to emit a secondary light, while the non-phosphor film optically modifies light to emit an optically modified primary light. GlobalData’s report on Marubeni gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Marubeni, Fuel cell powered drones was a key innovation area identified from patents. Marubeni's grant share as of January 2024 was 34%. Grant share is based on the ratio of number of grants to total number of patents.

Display device with light source emitting different peak wavelengths

Source: United States Patent and Trademark Office (USPTO). Credit: Marubeni Corp

A recently granted patent (Publication Number: US11886073B2) discloses a display device that includes a light source emitting a first light with a specific peak wavelength and a liquid crystal display (LCD) module. The LCD module consists of sub-pixels, with one sub-pixel containing a phosphor film to emit a second light with a different peak wavelength, and another sub-pixel containing a non-phosphor film with color filtering properties to shift the peak wavelength of the light. The device aims to produce light in the blue wavelength spectrum of the visible spectrum, enhancing display quality.

Furthermore, the patent describes variations in the display device, such as the use of different light sources like organic light emitting diodes (OLEDs) or quantum dot LEDs (QLEDs) to emit light with varying peak wavelengths. The inclusion of phosphor and non-phosphor films aids in manipulating the light emitted by these sources to achieve desired peak wavelengths in the blue region of the visible spectrum. The patent also highlights the use of specific materials like dyes, inks, or scattering particles in the non-phosphor film to achieve the desired color filtering properties, ultimately enhancing the visual output of the display device.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.