Power level shift circuit

A technology of level shifting circuit and power supply voltage, applied in logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, instruments, etc., can solve component uniformity and stability variation, level shifting circuit 163 delay, poor transistor characteristics and other issues to achieve the effect of improving the stability of circuit operation and increasing the speed of circuit operation

Active Publication Date: 2008-10-01
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the liquid crystal display produced by the LTPS manufacturing process can integrate the circuit on the display glass, the uniformity and stability of the components in the LTPS manufacturing process have great variability, especially the threshold voltage of the transistor (V TH ) and electron mobility (μ) have a great influence on ci

Method used

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  • Power level shift circuit
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Examples

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Example Embodiment

[0040] Please refer to FIG. 3, which is a functional block diagram of the level shift circuit 100 of the present invention. The level shift circuit 100 can be used in a source driver of a liquid crystal display to increase the voltage level of an input signal. The level shift circuit 100 includes a voltage divider circuit 102 and a buffer circuit 104. The voltage divider circuit 102 is coupled to the input terminal I for receiving an input signal, and for outputting a first voltage signal at the first node P according to the input signal. The voltage divider circuit 102 includes a first load 106 and a second load 108. The first load 106 is coupled to the first power supply voltage VDD And between the first node P. The second load 108 is coupled between the input terminal I and the first node P. The buffer circuit 104 is coupled to the first node P to increase the voltage level of the first voltage signal to form a second voltage signal, and output the second voltage signal to the ...

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PUM

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Abstract

A level shift circuit which is used for increasing the voltage level of an input signal comprises a voltage dividing circuit and a buffer circuit. The voltage dividing circuit is coupled to the input signal and is used for outputting a first voltage signal according to the input signal. The voltage dividing circuit comprises a first load which is coupled between a first supply voltage and a first node, and a second load which is coupled between the input end and the first node. The buffer circuit is coupled to the first node and is used for increasing the voltage level of the first voltage signal to form a second voltage signal and outputting a second voltage signal. The level shift circuit according to the invention adopts an active load for operation as the active load can reduce the requirement of the threshold voltage (VTH). Therefore the level shift circuit of the invention can increase the operation stability of the circuit and at the same time increase the operation speed of the circuit.

Description

technical field [0001] The present invention relates to a level shifting circuit, especially to a critical voltage (V TH ) level shifter circuit with low sensitivity and suitable for low input voltage operation. Background technique [0002] Displays with advanced functions have gradually become an important feature of today's consumer electronics products, among which liquid crystal displays have gradually become an important feature of various electronic devices such as televisions, mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or notebook computer screens. widely applied. Low Temperature Poly-Silicon (LTPS) liquid crystal displays are currently the mainstream in the development of consumer products, and are mainly used in highly integrated and high-quality displays. [0003] see figure 1 , figure 1 is a functional block diagram of a prior art source driver. The source driver 10 includes an output stage circuit 161 , a digital-to...

Claims

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Application Information

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IPC IPC(8): H03K19/003H03K19/0175H03K19/0185G09G3/36
Inventor 陈忠君
Owner AU OPTRONICS CORP
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