公开(公告)号：US11861093B1

公开(公告)日：2024-01-02

申请号：US18148239

申请日：2022-12-29

Applicant: SILEAD INC.

Inventor： Jingze Huang

IPC: G05F1/575 ,  G05F1/59 ,  H03F3/45 ,  G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0412 ,  G06F3/0445

Abstract: A charge source circuit, an analog-to-digital converter (ADC) and an organic light-emitting diode (OLED) touch panel are disclosed. The charge source circuit includes a reference current generation block, a current mirror block and a charge output block. The charge output block is configured to provide an amount of charge as current times time, rather than voltage times capacitance as conventionally done. This dispenses with the use of a voltage division technique, a drive operational amplifier or a great number of capacitors, resulting in circuit simplicity, reduced cost and circuit layout area savings. Moreover, current and time interval sequences can be designed to enable, with a very small area and voltage, continuous adjustability of the amount of charge within a desired range at a higher resolution. An equivalent capacitance corresponding to the amount of charge can be adjusted within a range from tens to hundreds of pF.