Patent ID: 11906872
Assignee: ELSTAR DYNAMICS PATENTS B.V.
Field: nan (nan)
Classification: CPC nan | IPC G

Claim 0:
1. A light modulator comprising:
a first substrate and a second substrate, the first and second substrates being arranged with inner sides opposite to each other, multiple electrodes being applied to the inner side of the first substrate and multiple electrodes being applied to the inner side of the second substrate, each of the multiple electrodes on the first and second substrates being arranged in a pattern across the substrate, the multiple electrodes each comprising:
a multiple of main-lines extending across the substrate in a first direction, the multiple of main-lines of the multiple electrodes being arranged alternatingly with respect to each other on the substrate;
an optical layer between at least the first and second substrate, the optical layer comprising
a fluid comprising particles, wherein the particles are electrically charged or chargeable, and wherein the particles absorb or reflect light;

at least one current sensing circuit connected to an electrode on a substrate, wherein the current sensing circuit measures a current in the electrode to which it is connected, wherein the light modulator comprises multiple current sensing circuits, each electrode of the multiple electrodes being connected to a corresponding one of the multiple current sensing circuits; and
a controller comprising one or more processor circuits and a non-transitory electronic memory storing computer instructions executable by the one or more processor circuits to perform:
applying an electric potential to at least one of the electrodes according to a measuring potential during a measuring duration,
receiving at least one current sensing signal from the at least one current sensing circuit during the measuring duration indicating a current in the connected electrode,
determining driving signals for the multiple electrodes from the at least one current sensing signals and from a target transparency or reflectivity, and
applying an electric potential to the multiple electrodes according to a driving signal after the measuring duration to obtain an electro-magnetic field between the multiple electrodes, wherein the electro-magnetic field provides electrophoretic movement of the particles towards or from one of the multiple electrodes.