Patent ID: 9728155
Date: 2017-08-08
CPC Classifications: G09G

Claim:
1. A liquid crystal display with gamma application circuit comprising: a liquid crystal display having one or more source driver chips, wherein each source driver chip includes an input stage having a digital-to-analog converter (DAC) followed by a buffering amplifier; and a gamma application circuit coupled to the input stage of the one or more source driver chips with a discrete inductor to supply each of the one or more source driver chips with a gamma correction signal; wherein the gamma application circuit comprises a capacitor coupled to the inductor, a switching Class D switching amplifier coupled to an analog voltage power supply and having a power efficiency equal to or greater than 80%, the Class D switching amplifier being configured as a switching power supply having a positive input, a negative input, and an output to output a switching waveform used to form the gamma correction signal and a gamma feedback signal coupled to the negative input, and a control circuit coupled to the Class D switching amplifier, wherein the control circuit is configured to control the Class D switching amplifier so as to modulate a duty cycle of the switching waveform.