Topology of distributing and connecting LEDs in a large area matrix

Patent metadata

Field	Value
Publication number	US-9655183-B2
Application number	US-201214241111-A
Country	US
Kind code	B2
Filing date	Aug 31, 2012
Priority date	Sep 6, 2011
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A LED circuit comprises an array of LEDs is arranged in a matrix. The matrix is connected to at least three power rail lines. The LEDs are formed as a first LED arrangement ( 34 ) between a first power rail line ( 30 ) and a second power rail line ( 32 ) and a second LED arrangement ( 36 ) between the second power rail line ( 32 ) and a third power rail line ( 30 ) of the same voltage as the first power rail line. This means there are alternating power rail lines interspersed with the matrix of LEDs. This enables the driving voltages to be kept low and it improves scalability of the design.

First claim

The invention claimed is:

1. An LED circuit, comprising:
an array of LEDs arranged in a first matrix, each LED connected within the first matrix by connecting wires;
the first matrix interposed between a pair of voltage rails;
the pair of voltage rails are connected to at least three power rail lines distributed across the area of the first matrix;
wherein the LEDs connected within the first matrix include
a first LED arrangement between a first power rail line and a second, adjacent power rail line;
a second LED arrangement between the second power rail line and a third power rail line configured be of the same electrical potential as the power rail line;
the third power rail line adjacent the second power rail line and on the opposite side of the second power rail line compared to the first power rail line;
the first and second LED arrangements comprising a plurality of parallel pairs of LEDs in series alignment, each of said plurality of parallel pairs of LEDs being at least two LEDs in parallel and including a bridge interposed between each of said plurality of parallel pairs of LEDs, wherein the first and second arrangements are aligned cathode-to-cathode;

an array of LEDs arranged in a second matrix;
the second matrix interposed between the pair of voltage rails, wherein the second matrix is connected in parallel alignment with the first matrix and includes a third LED arrangement connected to the third power rail line; and
the third LED arrangement comprising a plurality of parallel pairs of LEDs in series alignment, each of said plurality of parallel pairs of LEDs being at least two LEDs in parallel and including a bridge interposed between each of said plurality of parallel pairs of LEDs, wherein the second LED arrangement of the first matrix and the third LED arrangement of the second matrix are aligned anode-to-anode.

Assignees

• Krijn Marcellinus Petrus Carolus Michael
• Weekamp Johannes Wilhelmus
• Cornelissen Hugo Johan
• Philips Lighting Holding Bv

Inventors

• Krijn Marcellinus Petrus Carolus Michael
• Weekamp Johannes Wilhelmus
• Cornelissen Hugo Johan

Classifications

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title

• H05B45/44

  with an active control inside an LED matrix · CPC title

• G09G2300/0426

  Layout of electrodes and connections · CPC title

• G02F1/133603

  with LEDs · CPC title

• F21K9/00

  Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers · CPC title