Differential amplifier, data driver and display device

Abstract

A differential amplifier includes a differential amplifying stage and an output amplifying stage. The output amplifying stage includes a first transistor for pull-up, a second transistor for pull-down, a capacitor element, and switches. The first transistor for pull-up is connected across an output terminal and a high potential side power supply VDD and has a control terminal to which is connected a first differential output. The second transistor for pull-down is connected across the output terminal and a low potential side power supply VSS and has a control terminal to which is connected a second differential output. The switches interchangeably connect the capacitor element across the output terminal and the control terminal of the first transistor for pull-up or across the output terminal and the control terminal of the second transistor for pull-down.

Description

technical field [0001] The invention relates to a differential amplifier and a display device using the differential amplifier. Background technique [0002] In recent years, liquid crystal display devices (LCD: Liquid Crystal Device) with advantages of thin size, light weight, and low power consumption have begun to be widely used. The display unit of mobile devices such as notebook PCs (Personal Computers). Recently, however, the technology for increasing the size of the display device and supporting animation is also improving, and not only for mobile use, but also for fixed installation type liquid crystal display devices and large-screen liquid crystal televisions. [0003] These liquid crystal display devices are used in liquid crystal display devices of an active matrix drive type capable of high-definition display. [0004] FIG. 28 is a diagram illustrating a liquid crystal display device. In addition, in FIG. 28, only the equivalent circuit of the main structure ...

AI Technical Summary

Problems solved by technology

[0019] However, even in the differential amplifier shown in FIG. 30, if the charging operation and discharging operation are performed frequently, the average value of the current consumption increases, and the power consumption increases.

In particular, in the process of increasing the definition and size of liquid crystal display devices, not only the load capacitance of the data line is increased, but also the driving frequency of the data line is increased, resulting in frequent charging and discharging operations, and increased power consumption.

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