US 12,360,419 B2
Backlighting unit with a reflector, a diffuser, and an optical assembly
Ulrich Streppel, Regensburg (DE)
Assigned to ams-OSRAM International GmbH, Regensburg (DE)
Appl. No. 18/563,693
Filed by ams-OSRAM International GmbH, Regensburg (DE)
PCT Filed May 24, 2022, PCT No. PCT/EP2022/064033
§ 371(c)(1), (2) Date Nov. 22, 2023,
PCT Pub. No. WO2022/248461, PCT Pub. Date Dec. 1, 2022.
Claims priority of application No. 102021113573.7 (DE), filed on May 26, 2021.
Prior Publication US 2024/0280857 A1, Aug. 22, 2024
Int. Cl. G02F 1/1335 (2006.01); G02F 1/13357 (2006.01)
CPC G02F 1/133607 (2021.01) [G02F 1/133603 (2013.01); G02F 1/133605 (2013.01); G02F 1/133608 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A backlighting unit
having a carrier having an upper side arranged parallel to an x-y plane, a reflector assembly arranged above the carrier in a z direction, an optical assembly arranged above the reflector assembly in a z direction, and a diffuser arranged above the optical assembly in the z direction,
wherein a cell of the backlighting unit comprises a section of the carrier having an optoelectronic semiconductor chip arranged on the upper side, a reflector of the reflector assembly, an optical element of the optical assembly, and a section of the diffuser,
wherein the reflector has a concave mirror surface,
wherein the optical element has a front side facing toward the reflector and a rear side facing away from the reflector,
wherein the front side is divided into front-side surface sections arranged in the form of a matrix and the rear side is divided into rear-side surface sections arranged in the form of a matrix,
wherein at least two front-side surface sections are designed differently and at least two rear-side surface sections are designed differently,
wherein each front-side surface section and each rear-side surface section is designed so that a light beam penetrating the respective surface section centrally in the z direction experiences a defined beam deflection and a defined beam expansion,
wherein the front-side surface sections are not congruent with the rear-side surface sections, and
wherein the beam expansion takes place in at least one surface section according to a top hat scattering distribution having defined scattering width.