Power supply circuit, liquid crystal drive device, liquid crystal display device and boosting circuit

Abstract

The invention is suitable for the field of an integrated circuit, providing a power supply circuit, a liquid crystal driving device, a liquid crystal displaying device and a boosting circuit thereof. The power supply circuit comprises a charge pump circuit, which is used for generating a driving voltage by using a charge pump; a first controlling circuit, which is used for closed-loop controlling the charge pump circuit to generate a positive high-voltage; a bias ratio circuit, which is used for generating a sub positive high-voltage and a minimum positive high-voltage, according to the positive high-voltage and a zero-potential voltage generated by the first controlling circuit; and a second controlling circuit, which is used for closed-loop controlling the charge pump circuit to generate a negative high-voltage according to the sub positive high-voltage and the minimum positive high-voltage generated by the controlling of the bias ratio circuit. By using the invention, a high-voltage which is higher than the liquid crystal driving voltage or a negative voltage which is lower than the liquid crystal maximum negative voltage does not exist in the system, thus reducing the power consumption of the circuit; the circuit structure is simple and easy to be realized, moreover, the circuit can ensure well the consistency and symmetry of the positive and negative voltages.

Description

technical field [0001] The invention belongs to the field of integrated circuits, and in particular relates to a power supply circuit, a liquid crystal driving device, a liquid crystal display device, and a voltage boosting circuit. Background technique [0002] Liquid crystal display panels occupy an increasingly broad market in the field of portable displays. People increasingly require low power consumption and high-definition display for portable electronic visual equipment, and the display quality of the liquid crystal panel is related to the power supply voltage of the liquid crystal driving device. Therefore, the liquid crystal driving device needs low power consumption, and the liquid crystal driving voltage needs to be relatively symmetrical. In addition, in order to enable wider application of the liquid crystal driving device, the power supply voltage should have a wide selection range. The liquid crystal driving device needs to provide a high driving voltage, s...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a power supply circuit, which aims to solve the problem of relatively complex structure and relatively large power consumption of the existing circuit for generating liquid crystal driving voltage

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