Power circuit of display apparatus

Abstract

The invention relates to a power circuit of a display apparatus. The power circuit includes a time sequence controller, a control circuit and a charge pump (which can be single-grade or multi-grade). The time sequence controller outputs a time sequence control signal to the control circuit; the control circuit outputs a pulse singal or a capacity value adjusting singal according to the time sequence control signal. The charge pump receives an input voltage and outputs an output voltage according to a time pulse singal or the time sequence control signal to a scanning driver to generate a plurality of scanning driving singals. Thereby, the output voltage boost speed of the charge pump is raised based on the voltage transformation time of the scanning driving signals, when the voltage transformation time is near equal to the voltage maintenance time of the scanning driving signals, the output voltage boost speed is reduced, and power consumption is reduced.

Description

technical field [0001] The present invention relates to a power supply circuit, in particular to a power supply circuit of a display device. [0002] Background technique [0003] In many electronic devices on the market today, power supply voltages of different levels are often required, so charge pump circuits are often configured to use the existing power supply voltages to generate various power supply voltages of different levels. Traditional charge pump circuits generally use It includes a voltage source, at least one charging capacitor, an output capacitor, a plurality of switchover switches and a frequency with a fixed frequency for controlling the plurality of switchover switches to generate power supply voltages of different levels. First, use these switches to connect the voltage source and the charging capacitor in parallel, so that the charging capacitor is charged to a certain voltage level, and then connect it in series with the output capacitor. After repeat...

AI Technical Summary

Problems solved by technology

[0007] As can be seen from the above, since the charge pump circuit of the power supply circuit of the conventional display device needs a larger magnification and switching frequency when scanning the voltage conversion time of the square wave of the driving signal to quickly climb the voltage to a certain level, the setting magnification The voltage circuit has a large fixed rate and switching frequency enough to climb to this level. However, the charge pump circuit of the power supply circuit only needs to maintain the voltage during the voltage holding time, and it is too high during the voltage holding time. The multiplier and switching frequency will cause excessive power consumption, so there is still considerable room for improvement using a charge pump circuit with a fixed multiplier or switching frequency

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