Output buffering circuit, array substrate and display device

Abstract

The invention discloses an output buffering circuit which comprises a first-stage operational amplifying circuit, a second-stage operational amplifying circuit and a feedback circuit arranged between the first-stage operational amplifying circuit and the second-stage operational amplifying circuit. The first-stage operational amplifying circuit is used as a differential input circuit, the second-stage operational amplifying circuit is used as a common-source cascade amplifying circuit with an active load, and the feedback circuit is used for providing a bias voltage and having the driving capacity of alternatively providing a source current and a sink current. The first-stage operational amplifying circuit and the second-stage operational amplifying circuit form a unit gain amplifier through the feedback circuit, so that the whole circuit can have the driving capacity of alternatively providing the source current and the sink current. A special voltage stabilizing circuit is not required any more, the circuit structure is simple, the chip area can be reduced, power consumption can be further lowered due to the fact that the special voltage stabilizing circuit is not required any more, meanwhile, fluctuations of the output voltage can be restrained, the stability of the circuit during working is guaranteed, shifting is restrained to the maximum degree, an output signal is accurate, and a displayed image is good in quality.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to an output buffer circuit, an array substrate and a display device. Background technique [0002] Liquid crystal displays are more and more entering people's lives due to their portability, ultra-thin, multi-color and high-definition features, and occupy a dominant position in the display field. However, in today's display field, as the requirements for display resolution and pixel quality are getting higher and higher, the power consumption of the entire voltage drive circuit is also increasing, which affects the power consumption of the drive control chip and the picture of the LCD screen. Quality requirements are also getting higher and higher. [0003] At present, most mainstream panels use TFT-LCD (Thin Film Transistor-Liquid Crystal Display) technology to obtain better image quality and lower power consumption as possible. Since the output buffer circuit of the TFT-LC...

AI Technical Summary

Problems solved by technology

[0004] Due to the above figure 1 There is no feedback circuit in the circuit shown, and the suppression of output fluctuations cannot be achieved, resulting in large fluctuations in the output voltage and poor stability

In order to solve the problem of unstable output, the existing circuit generally needs to add a special voltage regulator circuit on the basis of the above-mentioned two-stage operational amplifier circuit to increase the chip area. At the same time, it is also necessary to increase the bias current of the output stage to increase the sink current. consumes a lot

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