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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.

Inactive Publication Date: 2011-04-06
HIMAX TECH LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to process tolerances, the offset voltage of the op amp is often greater than 1 / 2 of the lowest bit, and thus degrades the accuracy of the source driver

Method used

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

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Embodiment Construction

[0030] The following description will describe the embodiments of the present invention in detail along with the illustrations of the embodiments. The same or similar reference numerals used in the drawings are used to describe the same or similar parts.

[0031] Figure 1A It is a circuit diagram of a source driver according to an embodiment of the present invention. Figure 1B based on Figure 1A Timing diagram of the source driver of the embodiment. Please refer to Figure 1A , the source driver 100 is suitable for driving a display panel 110, wherein the display panel 110 is, for example, a liquid crystal display panel or a single crystal silicon reflective liquid crystal panel. In general, in order to avoid polarization of liquid crystals, polarity inversion is often performed on the display panel 110 to drive pixels on the display panel 110 . That is to say, in different frame periods, pixel signals of complementary polarities (such as positive polarity and negative po...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3614G09G2310/0291G09G3/3688G09G2330/023G09G2310/0297
Inventor 蔡建泓王家辉张进添陈英烈
Owner HIMAX TECH LTD
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