Patent ID: 9608614
Date: 2017-03-28
CPC Classifications: G09G,H03K,H04N

Claim:
1. A comparator circuit, comprising: a differential circuit configured to detect a difference between two input signals; a current supply configured to supply a current to the differential circuit; and a control circuit configured to detect an operation timing of the differential circuit and to control the current supplied to the differential circuit by the current supply according to a detection result thereof, wherein the current supply is arranged to selectively supply a first current at a first time and a second current at a second time which is lower than the first current to the differential circuit; wherein the control circuit is configured to control the current supply to supply the second current when the differential circuit is in a standby state, and to switch a supply of the second current to a supply of the first current before the differential circuit is shifted from the standby state to an operating state; and wherein the differential circuit includes a differential amplifier arranged to output a signal according to the difference between the two input signals, and a first amplifier having a first threshold voltage, to which an output signal of the differential amplifier is input, and the control circuit includes a second amplifier having a second threshold voltage lower than the first threshold voltage of the first amplifier, to which the output signal of the differential amplifier is input, wherein an output from the second amplifier is coupled to the current supply to control the current supply to switch between the first current and the second current according to an output signal of the second amplifier.