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Source driver and method of reducing its peak current

A source driver and circuit technology, applied in the field of source driver and reducing its peak current, can solve the problems of system interference, power supply voltage VDDA level drop, affecting the normal operation of internal circuits, etc., and achieve the effect of reducing instantaneous peak current.

Active Publication Date: 2017-06-06
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This instantaneous peak current often causes the level of the power supply voltage VDDA to drop instantaneously, thereby affecting the normal operation of the internal circuit
In addition, the instantaneous level drop of the power supply voltage VDDA will also have the effect of electromagnetic interference (EMI) on the system

Method used

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  • Source driver and method of reducing its peak current
  • Source driver and method of reducing its peak current
  • Source driver and method of reducing its peak current

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Embodiment Construction

[0066] As used throughout this specification (including the claims), the term "coupled" may refer to any connection means, direct or indirect. For example, if it is described in the text that a first device is coupled to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be connected through other devices or some kind of connection means. indirectly connected to the second device. In addition, wherever possible, elements / components / steps using the same reference numerals in the drawings and embodiments represent the same or similar parts. Elements / components / steps using the same symbols or using the same terms in different embodiments can refer to related descriptions.

[0067] image 3 It is a circuit block diagram illustrating a source driver (Source Driver, SD) according to an embodiment of the present invention. The source driver 300 is coupled between the timing controller 10 and the d...

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Abstract

The invention provides a source driver and a method for reducing the peak current of the source driver. The source driver comprises a latch circuit, a level shifter and a digital-to-analog circuit, wherein current bit data are stored in the latch circuit which is coupled to the input end of the level shifter, and the digital-to-analog circuit is coupled to the output end of the level shifter. When the current bit data are not the complement of previous bit data, the latch circuit outputs the current bit data to the input end of the level shifter, and the digital-to-analog circuit outputs the voltage corresponding to the output data of the level shifter. When the current bit data and the previous bit data are mutually complemented, the latch circuit outputs the previous bit data to the input end of the level shifter, and the digital-to-analog circuit outputs the voltage corresponding to the current bit data.

Description

technical field [0001] The invention relates to a source driver and a method for reducing its peak current. Background technique [0002] figure 1 It is a circuit block diagram illustrating a conventional source driver (Source Driver, SD). The source driver 100 is coupled between a timing controller 10 and a display panel 20 . The power supply voltage VDDA can supply power to the source driver 100 . According to the control of the timing controller 10 , the source driver 100 can convert pixel data provided by the timing controller 10 into a driving voltage, and use the driving voltage to drive the display panel 20 to display corresponding images. The source driver 100 includes a data receiver (data receiver) 110 , a latch (latch) 120 , a digital analog converter (Digital Analog Converter, DAC) 130 and an output buffer (output buffer) 140 . [0003] figure 2 is description figure 1 Schematic diagram of the signal timing for the source driver shown. Please refer to fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/20G09G3/36
Inventor 杨舜勋
Owner NOVATEK MICROELECTRONICS CORP