Device for controlling visibility

Tapio Mäkelä (Inventor), Teemu Ruotsalainen (Inventor), Asko Sneck (Inventor)

Research output: PatentPatent


A visibility control device (500) comprises: - one or more light sources (LED1) to provide input light (B0), - a waveguiding substrate (SUB1), which has a first major surface (SRF1) and a second major surface (SRF2), - a plurality of light-deflecting grooves (G1) implemented on at least one major surface (SRF1, SRF2) of the substrate (SUB1), wherein the device (500) is arranged to form guided light (B1) by coupling the input light (B0a) into the substrate (SUB1), wherein the grooves (G1) are arranged to form deflected light (B2) by coupling the guided light (B1a) out of the substrate (SUB1) through the second major surface (SRF2) of the substrate (SUB1).

Patent family as of 12.9.2022

FI129781 B20220831FI2020000605420201026 
FI20206054 A20220427FI2020000605420201026 
WO22090619 A120220505WO2021FI5071620211026

Link to current patent family on right 

Original languageEnglish
Patent numberFI129781
IPCG02B 6/ 00 A I
Priority date26/10/20
Publication statusPublished - 27 Apr 2022
MoE publication typeH1 Granted patent


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