US 12,464,618 B2
Arrangement including an LED pixel matrix with LEDs connected anti-parallel and a driver circuit for controlling the LED pixels
Bernd Schulte-Eversum, Geseke (DE)
Assigned to HELLA GMBH & CO. KGAA, Lippstadt (DE)
Filed by HELLA GMBH & CO. KGAA, Lippstadt (DE)
Filed on Apr. 22, 2024, as Appl. No. 18/641,682.
Claims priority of application No. 102023110928.6 (DE), filed on Apr. 27, 2023.
Prior Publication US 2024/0365451 A1, Oct. 31, 2024
Int. Cl. H05B 45/42 (2020.01); H05B 45/30 (2020.01)
CPC H05B 45/42 (2020.01) [H05B 45/30 (2020.01)] 11 Claims
OG exemplary drawing
 
1. An arrangement comprising:
an LED pixel matrix including a plurality of LED pixels; and
a driver circuit for controlling the LED pixel matrix;
wherein each of the plurality of LED pixels is formed from a dipole made up of two LEDs connected anti-parallel, including a first LED and a second LED;
wherein the LED pixel matrix includes at least one row and multiple columns of the dipoles forming the LED pixel;
wherein the dipoles of a row are connected with a first connection to a shared line;
wherein the shared line is connected to a node between a second connection of a first controllable switch assigned to the row and to a first connection of a second controllable switch assigned to the row;
wherein a first connection of the first switch assigned to the row is connected to a first connection of the arrangement;
wherein a second connection of the second switch assigned to the row is connected to a second connection of the arrangement;
wherein the arrangement includes a driver circuit assigned to the row, wherein this driver circuit includes for each dipole of the shared line a first connection; wherein each of the dipoles of the row is connected with its second connection to the first connection assigned to the dipole of the driver circuit assigned to the row;
wherein in the driver circuit assigned to the row, a current is adjustable with via one first current path, wherein each first current path extends from the first connection of the arrangement, via the first switch assigned to the row, via the first connection of one of the dipoles of the row, via the first LED of the dipole, via the second connection of the dipole to the first connection of the driver circuit assigned to the dipole;
wherein the arrangement also includes per row a current mirror, which has, per dipole each of the row, a first connection and a reference connection;
wherein each of the dipoles of a row is also connected with its second connection to the first connection assigned to the dipole of the current mirror assigned to the row;
each reference connection assigned to a dipole of the current mirror assigned to the line is connected with the first connection of the LED driver circuit for the same dipole; and
a current is adjustable for each dipole using the current mirror via one second current path each as a function of a signal at the reference connection assigned to the dipole, wherein each second current path extends from the second connection of the arrangement, via the second switch assigned to the row, via the first connection of one of the dipoles of the row, via the second LED of the dipole, via the second connection of the dipole to the first connection assigned to the dipole of the current mirror.