Patent ID: 8330706
Filing Date: 2012-12-11
Classification: G02F,G09G,H05B

Abstract:
1. A lighting device for a display device comprising: a light source; and a light source control device arranged to generate a pulse signal as a light source control signal to control the light source; wherein the light source control signal is an aperiodic signal that includes pulses each having different shapes from each other; the light source control device includes a periodic signal generating circuit, an aperiodic signal generating circuit, and a mixing circuit including an arithmetic logic circuit arranged to perform a logical operation on a plurality of signals; the mixing circuit is arranged to generate the light source control signal by performing the logical operation on respective pulses of a periodic signal generated by the periodic signal generating circuit and an aperiodic signal generated by the aperiodic signal generating circuit and to superimpose the pulses of the aperiodic signal on the pulses of the periodic signal to generate the light source control signal; the periodic signal generating circuit is arranged to generate a pulse signal defining the periodic signal including pulses provided at constant intervals and having a same shape; and the aperiodic signal generating circuit is arranged to generate a pulse signal defining the aperiodic signal including pulses having a different shape, and a number of the pulses of the aperiodic signal is equal to a number of the pulses of the periodic signal in one vertical period.