MUMBAI, India, Aug. 31 -- Intellectual Property India has published a patent application (202514116807 A) filed by Distance Technologies Oy on November 25, 2025, for Narrowband Reflective Optical Combiner With Narrowband Display Device Having Multi-Coloured Backlight Unit.
Inventors include Urho Konttori; Mikko Strandborg; and Petri Savolainen.
The application for the patent was published on August 28, 2026, under issue no. 35/2026.
Abstract: A display device (101) comprises a backlight unit (102) that is controllable to switch between lights of different colours having specific wavelengths, and an active panel (104) comprising a liquid crystal (LC) layer (108). A multi-band reflective coating on an optical combiner (124) is configured to selectively reflect the lights having the specific wavelengths. Different sets of drive signals are generated for different sub-images of an image. LC cells of the LC layer are controlled individually using the different sets of drive signals according to a predefined sequence in which the sub-images are to be displayed, whilst controlling the backlight unit to switch between lights of different colours according to the predefined sequence, thereby producing a synthetic light field (132) corresponding to the image. The optical combiner is employed to selectively reflect the synthetic light field towards eyes of user(s), whilst optically combining a real-world light field (126) with the synthetic light field. FIG. 1E
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