Voltage signal amplifying circuit

Abstract

The invention discloses a voltage signal amplifying circuit. The voltage signal amplifying circuit comprises a base source voltage input module, a compensation voltage input module, a voltage superposition module and a bias amplifying module, wherein the base source voltage input module is used for inputting a base source voltage; the compensation voltage input module is used for inputting a compensation voltage, the voltage superposition module is electrically connected with the base source voltage input module and the compensation voltage input module; the voltage superposition module is used for superposing the base source voltage and the compensation voltage, and outputting a superposed voltage; the bias amplifying module is electrically connected with the voltage superposition module;the bias amplifying module is used for receiving the superposed voltage output by the voltage superposition module and an alternating-current voltage signal output by a front DAC (Digital-to-Analog)module, and performing bias amplification processing on the alternating-current voltage signal; the alternating-current voltage signal output by the DAC module is a bias non-zero alternating-current voltage signal; and the compensation voltage input by the compensation voltage input module is used for compensating for a direct-current bias voltage of the alternating-current voltage signal output by the front DAC module. Through adoption of the voltage signal amplifying circuit, the voltage output by the voltage signal amplifying circuit conforms to a theoretical value.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display panels, in particular to a voltage signal amplifying circuit for amplifying an AC voltage signal input by a front DAC module to drive a liquid crystal panel to work. Background technique [0002] In recent years, liquid crystal displays have the characteristics of light and thin appearance, low power consumption and no radiation pollution, and have been widely used in portable information products such as notebook computers and personal digital assistants (PDAs). Among them, liquid crystal displays mainly include liquid crystal panels and drivers. The driving device for the operation of the liquid crystal display panel. The driving device includes a pre-DAC module (digital-to-analog conversion module), and the voltage signal generated by the pre-DAC module will be transmitted to the electrode on the CF side of the liquid crystal panel after being processed, and is used for the wide ...

AI Technical Summary

Problems solved by technology

Different digital front DAC modules will affect the effect of the narrow viewing angle of the LCD panel. The higher the digital digit, the smoother the change of the driving waveform under the narrow viewing angle, and the better the effect of the narrow viewing angle. When the DAC module outputs AC voltage, it will produce obvious step transition, which is not conducive to the effect of narrow viewing angle; the front DAC module with a higher number of digits cannot reach the electrodes on the CF side of the LCD panel due to its small output voltage range Work requirements, display effect is not good

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