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Source electrode driver with low power consumption and driving method thereof

A technology of source driver and driving method, applied in instruments, static indicators, etc., can solve problems such as power consumption

Active Publication Date: 2010-11-17
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The voltage swing of the output buffer 126 produces a large power consumption due to the different voltage levels of the driving signals of opposite polarity, and the output buffer 126 provides a large proportion of the power consumption of the source driver 120.

Method used

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  • Source electrode driver with low power consumption and driving method thereof
  • Source electrode driver with low power consumption and driving method thereof
  • Source electrode driver with low power consumption and driving method thereof

Examples

Experimental program
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Embodiment Construction

[0036] figure 2 An equivalent circuit diagram of a source driver according to an embodiment of the present invention is shown. Please refer to figure 2 , the source driver 210 of this embodiment is suitable for driving a display panel 220, wherein the display panel 220 may be a liquid crystal display panel or a liquid crystal on silicon (LCoS) panel. In general, the display panel 220 includes a plurality of pixel circuits (not shown), and the liquid crystal alignment corresponding to the position of each pixel circuit can control the light transmittance of the liquid crystal according to the voltage difference between the pixel electrode and the common electrode. , wherein the voltage of the pixel electrode can be changed by using the pixel signal, and the voltage of the common electrode can be a direct current (DC) voltage or an alternating current (AC) voltage. For the convenience of describing this embodiment, a first end and a second end of the display panel 220 can be...

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Abstract

The invention relates to a source electrode driver with low power consumption and a driving method thereof, applicable to driving a display panel. The source electrode driver comprises an output buffer and a first precharge circuit. The output buffer is provided with a first input terminal, a second input terminal and an output terminal; wherein the first input terminal receives a pixel signal and the second input terminal and the output terminal are coupled to the display panel. The first precharge circuit charges the output terminal of the output buffer to a preset voltage related to the pixel signal in precharge period. The output buffer is in off state in the precharge period and is set to be in starting state in a preset period after the precharge period. Thus, power consumption of the source electrode driver can be reduced.

Description

technical field [0001] The present invention relates to a source driver and its driving method, and in particular to a source driver capable of reducing power consumption, wherein the source driver includes an output buffer for charging a display panel. Background technique [0002] figure 1 A block diagram of a conventional source driver 110 and a display panel 140 is shown. Please refer to figure 1 , the source driver 110 includes a plurality of driving channels 120 . Each driving channel 120 includes a latch 122 , a digital-to-analog converter 124 (DAC), an output buffer 126 and an output switch 128 . Video data on the data bus is continuously input to the driving channel 120, wherein the driving channel 120 is controlled by a control signal CON provided by a timing controller (not shown). The source driver 110 converts digital video data into an analog driving signal through a digital-to-analog converter 124 , and transmits the driving signal to an output buffer 126 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G3/36
Inventor 邱明正江政隆曾威国
Owner HIMAX TECH LTD
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