公开(公告)号：USRE45707E1

公开(公告)日：2015-09-29

申请号：US14253900

申请日：2014-04-16

Applicant: NOVATEK MICROELECTRONICS CORP.

Inventor： Yu-Kuang Chang ,  Kuei-Chung Chang ,  Ming-Da Chiang

IPC: H04N5/202 ,  H04N9/69 ,  G09G5/06

CPC classification number: H04N9/69 ,  G09G5/06 ,  G09G2310/0289 ,  G09G2320/0673 ,  G09G2330/021 ,  G09G2330/028 ,  G09G2340/10

Abstract: A display driving circuit comprising a video signal transformation circuit, a reference voltage generating circuit, a DAC and an interpolation operational amplifier is provided. The video signal transformation circuit transforms an input video signal into a transformed video signal with a higher bit depth. The transformed video signal comprises an upper n bits data and a lower m bits data, wherein n+m equals a bit depth of the transformed video signal. The reference voltage generating circuit generates reference voltages. The DAC selects a first reference voltage and a second reference voltage to interpolation operational amplifier from the reference voltages according to an upper n bits data of the transformed video signal. The interpolation operational amplifier outputs a driving voltage to display device according to the first reference voltage, the second reference voltage and the lower m bits data of the transformed video signal.

Abstract translation: 提供了包括视频信号变换电路，参考电压产生电路，DAC和内插运算放大器的显示驱动电路。 视频信号变换电路将输入视频信号变换为具有较高位深度的变换视频信号。 经变换的视频信号包括高n位数据和较低m位数据，其中n + m等于变换视频信号的位深度。 参考电压产生电路产生参考电压。 DAC根据变换的视频信号的高n位数据从参考电压中选择第一参考电压和第二参考电压到插值运算放大器。 内插运算放大器根据变换后的视频信号的第一参考电压，第二参考电压和下位m位数据向显示装置输出驱动电压。