The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 2025
Filed:
Apr. 22, 2025
Distance Technologies Oy, Helsinki, FI;
Mikko Juhola, Muurla, FI;
Petri Savolainen, Espoo, FI;
Distance Technologies Oy, Helsinki, FI;
Abstract
A backlight unit for a liquid crystal display device includes an array of light-emitting elements. Each element includes a light source configured to emit light laterally relative to an optical axis of the backlight unit. A collimator is arranged on an optical path of emitted light rays in at least one direction to collimate the light rays. A first prism is positioned after the collimator to reflect a portion of the collimated light rays with one polarization orientation along the optical axis and transmit another portion with the opposite polarization orientation. A half-wave plate, arranged after the first prism, rotates the polarization of the transmitted light. A second prism, positioned after the half-wave plate, reflects the rotated light along the optical axis.