Patent ID: 7683816

Claim:
A system for displaying images, comprising: a digital-to-analog converting circuit for converting a digital signal with N bit data to an analog output signal, comprising: a capacitor type digital-to-analog converter coupled between a first node and a second node, comprising a plurality of capacitors and switches and generating a first analog signal according to the digital signal, a first reference voltage and a second reference voltage; an analogue buffer coupled between the second node and a third node for generating a second analog signal according to the first analog signal and a bias voltage, comprising: a first transistor coupled between a predetermined voltage and the third node, having a first gate coupled to the second node; and a second transistor coupled between a ground and the third node, having a second gate coupled to the bias voltage; a first switch coupled between the predetermined voltage and the second node; a second switch coupled between the first node and the third node; and a third switch coupled between the third node and the analog output signal for transmitting the second analog signal as the analog output signal when the third switch is turned on, wherein the second switch is turned on and the third switch is turned off when the first switch is turned on, and the first and second switches are turned off when the third switch is turned on.