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Differential class AB amplifier circuit, driver circuit and display device

A driver circuit, amplifier circuit technology, applied in the direction of differential amplifiers, amplifiers, DC coupled DC amplifiers, etc., can solve the problems of increased number, increased power consumption, increased phase compensation circuit area, etc., to achieve the effect of improving phase margin

Inactive Publication Date: 2011-01-19
RENESAS ELECTRONICS CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] like image 3 As shown in , in the phase compensation circuit in which the frequency-dependent current feed-forward path is cut by the current buffer transistor 301, since the constant current sources 303, 305 added to the phase compensation circuit in addition to the current buffer transistor 301, Makes the area of ​​the phase compensation circuit increase
In addition, the number of current paths between the voltage sources VDD and VSS increases, resulting in increased power consumption

Method used

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  • Differential class AB amplifier circuit, driver circuit and display device
  • Differential class AB amplifier circuit, driver circuit and display device
  • Differential class AB amplifier circuit, driver circuit and display device

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Embodiment Construction

[0031] Hereinafter, a driver circuit, a method of driving a circuit, and a display device according to embodiments of the present invention will be described with reference to the accompanying drawings.

[0032] Figure 4 is a block diagram showing the configuration of a display device according to an embodiment of the present invention. The display device includes a driver circuit having a control circuit, a grayscale power supply 5 , a scanning line driver circuit 6 and a data line driver circuit 7 , and a display panel 8 . The driver circuit of the display device drives the display panel 8 .

[0033] An example of the display panel 8 is an active matrix drive type color liquid crystal panel using thin film MOS transistors (TFTs) as switching elements. Pixels are arranged in a matrix at intersections of scan lines and data lines arranged at predetermined intervals in a row direction and a column direction. Each of the pixels includes a liquid crystal capacitor as an equiv...

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PUM

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Abstract

The invention relates to a differential class AB amplifier circuit, a driver circuit and a display device. The driver circuit of the present invention comprises a differential class AB amplifier circuit which comprises: a first differential amplifier circuit configured to amplify differential input signals and output a first signal in a first voltage range; a second differential amplifier circuit configured to amplify the differential input signals and output a second signal in a second voltage range; and a class AB output circuit configured to input the first and the second signals as differential signals and amplify the differential signals, wherein the class AB output circuit comprises: a phase compensating capacitance section; and a current buffer circuit configured to control a current flowing through the phase compensating capacitance section.

Description

technical field [0001] The present invention relates to a differential class AB amplifier circuit, and a driver circuit and a display device provided with the differential class AB amplifier circuit. Background technique [0002] In order to simultaneously drive a large number of capacitive loads, a display device includes a plurality of differential class AB amplifier circuits as driver circuits. For example, each of these driver circuits voltage-drives data lines in each column of an LCD (Liquid Crystal Display) panel and outputs analog signals corresponding to display data. Therefore, it is required to enable so-called rail-to-rail input / output over the entire range of the power supply voltage, and a voltage follower connected to a differential class AB amplifier has been used for this purpose. In addition, these driver circuits require low power consumption. [0003] Simultaneously, liquid crystal panels have increased in size and resulting parasitic capacitances on da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45G09G3/20G09G3/36
CPCH03F3/3022H03F3/45219G09G3/3688H03F3/45183H03F2203/45646H03F2203/45632
Inventor 久野晴彦
Owner RENESAS ELECTRONICS CORP
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