Source driver and compensation method for offset voltage of output buffer thereof

A technology for output buffers and source drivers, applied to instruments, static indicators, etc., can solve the problems of reducing the accuracy of source drivers, process errors, etc.
CN102005190AInactive Publication Date: 2011-04-06HIMAX TECH LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HIMAX TECH LTD
Publication Date
2011-04-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

A source driver and a compensation method for an offset voltage of an output buffer are provided. The source driver includes a storage element, an output buffer, a sampling unit and a first switch. The output buffer has a first input terminal coupled to the storage element and a second input terminal coupled to an output terminal thereof. The output buffer enhances an input signal of the first input terminal and thereby outputs an output signal via the output terminal. The sampling unit respectively transmits a pixel signal and the output signal to the first input terminal of the output buffer and the storage element during a first sub-period for storing an offset voltage of the output buffer in the storage element. The first switch transmits the pixel signal to the storage during a second sub-period for compensating the pixel signal with the offset voltage stored in the storage element.
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Description

technical field

[0001] The present invention relates to a source driver, and more particularly to a source driver for compensating the displacement voltage of an output buffer. Background technique

[0002] In recent years, liquid crystal displays have gradually become the mainstream of the market due to their characteristics of low power consumption, no radiation pollution and high space utilization. In the driving system of the display device, the source driver is an important element, which is used to convert the digital image signal into a driving voltage and provide the driving voltage to the pixel electrode connected to the enabled scanning line. Due to the panel loading effect and process differences, the driving voltage provided to the pixel electrode is not as expected. The source driver utilizes an output buffer to increase the driving capability of the driving voltage.

[0003] Typically, an operational amplifier is used to implement the output buffer of the sou...

Claims

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