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Source driver and level shifting apparatus thereof

A source driver and level shifting technology, which is applied in the direction of instruments, static indicators, logic circuit connection/interface layout, etc., can solve the problem of power consumption of level shifters, reduce power consumption, and avoid display noise Effect

Inactive Publication Date: 2008-05-07
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Because the first transistor 202 is always on, there is always current flowing through the level shifter, which causes the level shifter to consume power all the time

Method used

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  • Source driver and level shifting apparatus thereof
  • Source driver and level shifting apparatus thereof
  • Source driver and level shifting apparatus thereof

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Embodiment Construction

[0042] Please refer to image 3 , is a schematic diagram of a source driver used in a liquid crystal display device according to a preferred embodiment of the present invention. image 3 The source driver includes at least a shift register 302 , a latch buffer 304 , a level shifter 306 and a digital / analog converter (DAC) 308 . The latch buffer 304 stores and outputs an input signal according to the shift register 302 . The level shifting device 306 increases the voltage level of the input signal and outputs an output signal. The digital / analog converter 308 can receive the above output signal to output a driving voltage.

[0043] The level shifting device 306 at least includes a level shifter 400 and an asynchronous dynamic control circuit 500 . The level shifter 400 has a first switch, through which the level shifter 400 is connected to a high voltage source VDDA, wherein, if the level shifter is enabled, the level shifter The device will increase the voltage level of the ...

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PUM

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Abstract

The present invention discloses a source driver and a level shifting apparatus thereof. The level shifting apparatus comprises a level shifter and an asynchronous dynamic control circuit. The level shifter has a first switch and connected to a high power supply voltage source via the first switch, wherein the level shifter shifts a level of an input signal and outputs an output signal if enabled. The asynchronous dynamic control circuit sends an enabling signal for temporarily turning on the first switch to enable the level shifter.

Description

technical field [0001] The invention relates to a level shifting device used in a source driver, in particular to a level shifting device with an asynchronous dynamic control circuit. Background technique [0002] figure 1 It is a schematic diagram of a source driver used in a liquid crystal display device. figure 1 The source driver includes at least a shift register 102 , a latch buffer (Latch Buffer) 104 , a level shifter (level shifter) 106 and a digital / analog converter (DAC) 108 . The latch buffer 104 stores and outputs digital data signals under the control of the shift register 102 . The level shifter 106 shifts the voltage level of the digital data signal to a preset voltage value. The digital / analog converter 108 generates a driving voltage according to the signal output by the level shifter 106 . [0003] figure 2 is a schematic diagram of a known level shifter. Such as figure 2 As shown, the level shifter at least includes a first transistor 202 , a seco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133H03K19/0185
CPCH03K19/018521
Inventor 张育瑞
Owner HIMAX TECH LTD
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