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Over-drive D/A converter and source pole driver and its method

A digital-to-analog converter technology, applied in the field of digital-to-analog converters, can solve problems such as the decrease in conversion speed and affect the display quality of liquid crystal displays, and achieve the effects of increasing power consumption, improving display quality, and increasing conversion speed

Inactive Publication Date: 2008-03-19
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As the size of the LCD panel increases, the load capacitance required to be driven by the source driver becomes larger, and the problem of the conversion speed of the digital-to-analog converter due to the load capacitance becomes more obvious, which in turn affects the display quality of the LCD display.

Method used

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  • Over-drive D/A converter and source pole driver and its method
  • Over-drive D/A converter and source pole driver and its method
  • Over-drive D/A converter and source pole driver and its method

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Embodiment Construction

[0110] FIG. 2A is a block diagram of a digital-to-analog converter according to an embodiment of the invention. The digital-to-analog converter 200 generates a corresponding analog output voltage VOUT according to an input digital signal DAS. The DAC 200 includes a voltage dividing unit 210 , a selection unit 220 , a detection unit 240 and a buffer unit 230 . The selection unit 220 is coupled between the voltage dividing unit 210 and the buffer unit 230 . The detection unit 240 is coupled to the selection unit 220 and the buffer unit 230 .

[0111] The voltage dividing unit 210 is used to provide reference voltages V(1)˜V(2 M ), upper limit voltage VU and lower limit voltage VD, reference voltage V(1)~V(2 M ) corresponds to the value of the input digital signal DAS. In this embodiment, the input digital signal DAS has M bits. In other words, different input digital signals DAS correspond to different reference voltages V(1)~V(2 M ). The selection unit 220 provides a spe...

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Abstract

The invention provides an overdriven digital-analog converter, a source electrode driver and a method thereof. The digital-analog converter comprises a voltage division unit, a selecting unit, a buffering unit and a detection unit. The voltage division unit provides multiple reference voltages, and the detection unit outputs a regulation signal based on the comparison result between the output voltage of the buffering unit and a specific reference voltage corresponding to an input digital signal. the selecting unit regulates the overdriven voltage outputted to the buffering unit based on the regulation signal and input digital signal, so as to accelerate the output voltage variation of the buffering unit, thereby improving the conversion speed of the digital-analog converter.

Description

technical field [0001] The invention relates to a digital-to-analog converter, in particular to an overdrive digital-to-analog converter capable of increasing conversion speed, a source driver and a method thereof. Background technique [0002] A traditional digital-to-analog converter usually outputs a corresponding analog voltage according to an input digital signal via a decoder. The reference voltage can be generated by connecting resistors in series, and the reference voltage corresponding to the digital signal can be generated by means of resistor division. When the digital signal changes, the decoder switches to the corresponding reference voltage, and the voltage buffer outputs the corresponding analog voltage. [0003] In a source driver of a liquid-crystal display, the conversion speed of the digital-to-analog converter will directly affect the display quality of the liquid-crystal display. Since the DAC needs to drive the pixels in the panel, the conversion spee...

Claims

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Application Information

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IPC IPC(8): H03M1/66G09G3/36G09G3/20G02F1/133
Inventor 颜志仁
Owner NOVATEK MICROELECTRONICS CORP
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