Citizen Watch has been granted a patent for a light emitting device that includes multiple light emitting elements and phosphor mixtures. The device emits light in different wavelength ranges, including cyan, yellow, and red, by converting blue light emitted from the light emitting elements. The patent specifies the peak wavelengths of the converted light and the composition of the phosphor mixtures used. GlobalData’s report on Citizen Watch 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 Citizen Watch, Under-screen biometric identification was a key innovation area identified from patents. Citizen Watch's grant share as of September 2023 was 28%. Grant share is based on the ratio of number of grants to total number of patents.

Patent granted for a light emitting device with specific phosphor mixtures

Source: United States Patent and Trademark Office (USPTO). Credit: Citizen Watch Co Ltd

A recently granted patent (Publication Number: US11756939B2) describes a light emitting device that utilizes multiple blue light emitting elements and phosphor mixtures to produce light in different wavelength ranges. The device includes a first blue light emitting element, a second blue light emitting element, and a third blue light emitting element. Each blue light emitting element is covered by a different phosphor mixture.

The first phosphor mixture contains a phosphor that absorbs blue light from the first blue light emitting element and converts it to a first wavelength range of light with a peak at a specific wavelength. Similarly, the second phosphor mixture absorbs blue light from the second blue light emitting element and converts it to a second wavelength range of light with a peak at a different wavelength. The third phosphor mixture absorbs blue light from the third blue light emitting element and converts it to a third wavelength range of light with a peak at yet another wavelength. Additionally, the third phosphor mixture also contains a fourth phosphor that absorbs blue light and converts it to a fourth wavelength range of light with a peak at a different wavelength.

The patent specifies that the first wavelength range corresponds to cyan light, the second and third wavelength ranges correspond to yellow light, and the fourth wavelength range corresponds to red light on a CIE xy chromaticity diagram. Importantly, the first phosphor mixture does not contain a phosphor that converts light to wavelengths greater than the second wavelength, and the second phosphor mixture does not contain a phosphor that converts light to wavelengths greater than the second wavelength. Similarly, the third phosphor mixture does not contain a phosphor that converts light to wavelengths less than the third wavelength.

The device may also include white reflection resins positioned between the phosphor mixtures, a diffusion resin to uniformly irradiate the emitted light as white light, and a substrate to mount the blue light emitting elements. The white reflection resins and diffusion resin help enhance the overall light output and distribution.

Overall, this patented light emitting device offers a unique approach to producing light in different wavelength ranges using multiple blue light emitting elements and phosphor mixtures. The device's ability to generate specific colors of light can have various applications in lighting, displays, and other industries.

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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.