PRINTED LED DRIVER CIRCUIT

摘要

On a flexible substrate is printed LEDs and a driver circuit containing transistors. The LEDs and transistors are printed microscopic devices contained in an ink. The LEDs are printed in groups and connected in parallel, and the transistors are printed in groups and connected in parallel. Other components, such as resistors and an on/off switch, are also printed to form the driver. A battery and other circuit components may also be printed on the substrate. An overlay is provided over the LEDs to create a desired light pattern. The LEDs and driver may be generic, and the overlay customizes the light pattern for a particular application. The transistors in the driver may be interconnected with a trace pattern to drive the LEDs in a customized manner, such as for an insert in a product package for marketing to a consumer.

主权项

1. A structure including a circuit, the structure comprising:
a flexible substrate; light emitting diodes (LEDs) printed over the substrate, the LEDs being printed as one or more groups of LEDs, wherein multiple LEDs in each group are connected in parallel, and wherein the LEDs are randomly distributed within each group on the substrate; a driver, comprising transistors, for the LEDs printed over the substrate, the transistors being printed as one or more groups of transistors, where multiple transistors in each group of transistors are connected in parallel, and wherein the transistors are randomly distributed within each group of transistors on the substrate; and an interconnection conductor pattern on the substrate that interconnects the one or more groups of LEDs to the driver to energize the one or more groups of LEDs.