公开(公告)号：US20200380904A1

公开(公告)日：2020-12-03

申请号：US16828971

申请日：2020-03-25

Applicant: NOVATEK Microelectronics Corp.

Inventor： Yun-Hsuan Yeh ,  Tai-Yin Wu ,  Ying-Hsiang Wang ,  Yao-Hung Kuo

IPC: G09G3/20 ,  H03M1/74

Abstract: The present invention provides a driving circuit for a gamma voltage generator of a source driver. The gamma voltage generator includes a resistor string having a plurality of tap nodes, among which a plurality of first tap nodes are respectively connected to a plurality of first buffers. The driving circuit includes a second buffer, a digital-to-analog converter (DAC) and a control circuit. The second buffer is connected to a second tap node other than the plurality of first tap nodes among the plurality of tap nodes. The DAC is coupled to the second buffer. The control circuit, coupled to the DAC, is configured to receive a plurality of first control signals for the plurality of first buffers and calculate a second control signal for the DAC according to the plurality of first control signals.

公开(公告)号：US11081034B2

公开(公告)日：2021-08-03

申请号：US16828971

申请日：2020-03-25

Applicant: NOVATEK Microelectronics Corp.

Inventor： Yun-Hsuan Yeh ,  Tai-Yin Wu ,  Ying-Hsiang Wang ,  Yao-Hung Kuo

IPC: G09G5/10 ,  G09G3/20 ,  H03M1/74

Abstract: The present invention provides a driving circuit for a gamma voltage generator of a source driver. The gamma voltage generator includes a resistor string having a plurality of tap nodes, among which a plurality of first tap nodes are respectively connected to a plurality of first buffers. The driving circuit includes a second buffer, a digital-to-analog converter (DAC) and a control circuit. The second buffer is connected to a second tap node other than the plurality of first tap nodes among the plurality of tap nodes. The DAC is coupled to the second buffer. The control circuit, coupled to the DAC, is configured to receive a plurality of first control signals for the plurality of first buffers and calculate a second control signal for the DAC according to the plurality of first control signals.