Half AVDD circuit and liquid crystal display

Abstract

The invention discloses a half AVDD circuit which is used for providing half AVDD for a liquid crystal display. The half AVDD circuit comprises a voltage regulating module, a feedback module, a reference module, a determination module and a control module, wherein the voltage regulating module is used for receiving input voltage and outputting half AVDD; the feedback module is used for receiving the half AVDD and outputting feedback voltage; the reference module is used for receiving ideal half AVDD and outputting reference voltage, the ratio between the reference voltage and the ideal half AVDD is equal to the ratio between the feedback voltage and the half AVDD; the determination module is used for receiving the feedback voltage and the reference voltage and comparing the feedback voltage and the reference voltage so as to acquire a comparison result; and the control module is used for controlling the voltage regulating module to regulate the outputted half AVDD according to the comparison result so as to enable the half AVDD to be equal to the ideal half AVDD. The half AVDD circuit can provide half AVDD for the liquid crystal display under various operation modes. The invention further discloses a liquid crystal display.

Description

Technical field [0001] The present invention relates to the technical field of liquid crystal displays, in particular to a voltage accompanying circuit and a liquid crystal display using the voltage accompanying circuit. Background technique [0002] In recent years, liquid crystal displays (LCD) have gradually spread throughout people's lives. When the data driver chip (Source IC) of the liquid crystal display drives the display panel, only two sets of analog voltage (AVDD) and ground (GND) voltage provide high and low levels for the gamma output amplifier in the data driver chip Because the cross voltage is too large, it is easy to cause the data driver chip to overheat. Therefore, the industry has introduced the accompanying voltage (Half AVDD, HAVDD) to reduce the cross voltage, reduce the heat generation of the data driver chip, and lower the temperature. [0003] However, since the accompanying voltage generated by the existing accompanying voltage circuit is usually a fixed...

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Problems solved by technology

[0003] However, since the accompanying voltage generated by the existing accompanying voltage circuit is usually a fixed voltage, when the operation mode of the liquid crystal display is different, the accompanying voltage required by the data driver chip is different, so the accompanying voltage setting of the accompanying voltage circuit is prone to be inconsistent. The right question, causing the exception to work

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