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Driving circuit

A driving circuit and circuit technology, which is applied in the direction of instruments, power amplifiers, DC coupled DC amplifiers, etc., can solve the problems of increasing the area cost of the driving circuit, which is not conducive to the miniaturization of the driving circuit, etc.

Inactive Publication Date: 2009-07-15
深圳市科铭实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This increases the area overhead of the driving circuit, and the area of ​​the combinational logic circuit increases proportionally with the number of columns of the display panel, which is not conducive to the miniaturization of the driving circuit.

Method used

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no. 1 example

[0031] As a first embodiment of the present invention, an N-input differential class AB operational amplifier will be described below. Figure 4 is a circuit diagram of an N-input differential class AB operational amplifier according to the first embodiment of the present invention, refer to Figure 4 , in the input stage 11, a constant current source 111, N-channel MOS transistors 112 and 113, and P-channel MOS transistors 114 and 115 constitute a common N-channel differential amplifier circuit. The N-channel MOS transistor 116 connected in parallel with the current source 111 is an auxiliary current source, which will work when the amplifier is in positive transition, so as to enhance the positive transition rate.

[0032]In the N-input differential class AB operational amplifier, the P-channel output stage MOS transistor 121 of the output stage 12 is directly controlled by the output of the differential amplifier circuit, and the magnitude of its bias current depends on the...

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Abstract

The invention discloses a kind of circuit, which includes a group of voltage-followers. The voltage-followers include a N-input voltage-follower, a P-input voltage-follower, a complementary voltage-follower of P and N, a signal-swing with a wide coverage, there components are parallel-connected to drive a number of data lines. The described voltage-followers are composed of operational amplifier circuits of differential class AB, including enhanced conversion circuits, so it has advanced characteristics, such as high-speed, low-power and high level integration.

Description

technical field [0001] The invention relates to a drive circuit comprising a voltage follower. The voltage follower circuits included in the present invention relate more particularly to class AB operational amplifier circuits and related analog integrated circuit technology. The invention is suitable for providing driving for multiple data lines with wide swing; especially suitable for various LCD driving circuits based on high-voltage CMOS and BICMOS technology. Background technique [0002] Under existing circumstances, a group of parallel voltage followers is often used to drive a group of analog data lines with relatively large capacitive loads, such as a liquid crystal display matrix. figure 1 A structural schematic diagram of a dot-matrix LCD panel and its driving circuit described in Chinese published patent application (CN 1607564A) is shown. figure 1 It includes a TFT (Thin Film Transistor) LCD panel 2. A pixel is formed at the intersection of a scanning line 23 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133H03F3/45H03F3/20
Inventor 林丰成林昕蒋延飞
Owner 深圳市科铭实业有限公司