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output buffer

An output buffer, output node technology, used in instruments, static indicators, logic circuit connections/interface layouts, etc.

Active Publication Date: 2019-04-30
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Amplifying stage circuit receives analog display voltage to generate amplified display voltage

Method used

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Embodiment Construction

[0010] figure 1 A functional block diagram of an output buffer 100 according to an embodiment of the present invention is shown, which can be used to drive a display panel 2 (such as a liquid crystal display panel). In a specific example, the output buffer 100 of this embodiment is set in the source driver 1 , for example, in the output stage of the source driver 1 . An input terminal of the output buffer 100 can receive an analog display voltage from a digital-to-analog converter (DAC) 110 , and an output terminal of the output buffer 100 can output the buffered display voltage to the display panel 2 .

[0011] In this embodiment, the output buffer 100 mainly includes an amplifier stage circuit 11 and a driver stage circuit 12, wherein the amplifier stage circuit 11 receives an analog display voltage from a digital-to-analog converter (DAC) 110, and the enlarged display voltage generated by the amplifier stage circuit 11 is The voltage is fed to the driver circuit 12 , and t...

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Abstract

The invention relates to an output buffer, which includes an amplification circuit that receives an analog display voltage to generate an amplified display voltage; a driver circuit that receives an amplified display voltage to generate a buffered display voltage for driving a display panel; and a switcher, which is configured to Between the amplifier circuit and the driver circuit. When it is in the high output impedance state, the switch is open, so that the driver stage circuit and the amplifier stage circuit are electrically separated from each other. When it is in the drive state, the switch is closed, so that the driver stage circuit and the amplifier stage circuit are electrically coupled to each other. .

Description

technical field [0001] The present invention relates to an output buffer, in particular to an output buffer of a source driver. Background technique [0002] When the resolution of the liquid crystal display panel is getting higher and higher, the problem of overheating of the source driver will occur. One of the reasons for the overheating is that when the source driver is driving the liquid crystal display panel, the driving current will flow through the multiplexer in the source driver. Generally, the heat-resistant temperature range of the silicon process is between 150 and 200 degrees Celsius. When the heat-resistant temperature range is exceeded, it will cause abnormal function of the component. Therefore, how to reduce the temperature of the source driver becomes an important issue in circuit design. A general way to reduce the temperature of the source driver is to increase the size of the multiplexer. However, in this way, the overall area of ​​the integrated ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0175G09G3/36
Inventor 王家辉黄宏裕徐传健
Owner HIMAX TECH LTD