Patent ID: 8643290

Claim:
A flat panel display (FPD), comprising: a display module for displaying an image; a power management circuit, which converts an input voltage to an output voltage according to a feedback signal; a plurality of light emitting modules for illuminating the display module, each light emitting module including: at least one light emitting device string, each light emitting device string having one or more light emitting devices connected in series, and each light emitting device string having a first end and a second end, wherein the first end is coupled to the output voltage for receiving power; and a local circuit for controlling current through the light emitting device string and generating a local feedback signal, wherein the local circuit has a first terminal for receiving power, a second terminal for coupling to the second end of the light emitting device string to control the current through the light emitting device string, a third terminal for generating the local feedback signal, and a fourth terminal for coupling to ground; wherein the local feedback signal of each light emitting module is coupled to a first node for providing the feedback signal at the first node; and a common wiring cluster including: an output voltage common wire for delivering the output voltage; a feedback signal common wire for delivering the feedback signal; and a ground common wire; wherein each light emitting module is electrically coupled to each of the common wires.