Patent ID: 8284133
Filing Date: 2012-10-09
Classification: G09G

Abstract:
1. A light emitting apparatus comprising: a plurality of light emitting parts connected in series; a current supplying part which supplies current to the plurality of light emitting parts; a plurality of switches connected in parallel to the plurality of light emitting parts, respectively, and causing the current to flow through the light emitting parts or bypass the light emitting parts; a controlling part which receives brightness information corresponding to the plurality of light emitting parts and outputs pulse width modulation signals to the switches so that emission time of the plurality of light emitting parts is separately adjusted based on the received brightness information; and a plurality of bootstrap capacitors selectively connected to the plurality of switches, respectively, wherein respective connections between the plurality of the bootstrap capacitors and the plurality of the switches are controlled based on the pulse width modulation signals output to the plurality of the switches by the controlling part; wherein the controlling part comprises a capacitor controller which controls the bootstrap capacitors to be charged with a certain voltage, wherein the controlling part supplies the certain voltage of at least one of the plurality of the bootstrap capacitors to turn on a corresponding switch among the plurality of the switches when the at least one of the plurality of the bootstrap capacitors is selectively connected to the corresponding switch based on a pulse width modulation signal, from among the pulse with modulation signals, output to the corresponding switch from the controlling part.