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Charge pump

A technology of charge pump and voltage, applied in the field of charge pump, can solve the problems such as the difficulty of integrating capacitors, and achieve the effects of less capacitors, reduced pins and costs, and high power efficiency

Inactive Publication Date: 2007-02-28
TPO DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at high operating currents (such as above 0.2mA), it is quite difficult to integrate the capacitors C1 to C3 and COUT

Method used

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Embodiment Construction

[0042] FIG. 3 is an embodiment of a block diagram of an N-stage charge pump (N is an integer greater than 1) provided by the present invention. As shown in the figure, a plurality of sub-charge pumps SCP1 to SCPN and an output module MOUT are connected in series. Each of the sub-charge pumps SCP1 to SCPN includes charging switch modules SWM1 to SWMN respectively connected to capacitors C1 to CN, wherein each charging switch module is turned on or off by charging clock signals CLK1 to CLKN. Similarly, the output module MOUT includes an output charging switch SWMOUT connected to the capacitor COUT, wherein the switching on or off of the output charging switch SWMOUT is controlled by the output charging clock signal CLKOUT. Each capacitor C1 to CN has a first terminal P1 to PN as the output terminals of the sub-charge pumps SCP1 to SCPN respectively connected to the next sub-charge pumps SCP2 to SCPN and the output module MOUT, and has a second terminal connected to the reference...

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Abstract

A charge pump is disclosed, comprising a plurality of sub-charge pumps connected in series, each comprising a charging switch module turned on or off according to a charging clock signal and a capacitor connected between the charging switch module and a reference clock signal. The charge pump further comprises at least one additional switch module connecting to a reference-clock-providing sub-charge pump and a reference-clock-accepting sub-charge pump among the sub-charge pumps to provide the reference clock signal of the reference-clock-accepting sub-charge pump according to an additional clock signal.

Description

technical field [0001] The present invention relates to charge pumps applicable to panel displays. Background technique [0002] FIG. 1 is a conventional three-stage (X4) charge pump 100 . As shown in the figure, four PMOS transistors PM1 to PM3 and PMOUT are connected in series, and each transistor is respectively connected to one end of capacitors C1 to C3 and COUT, and each transistor is controlled by a level shifter LS1 to LS3 and LSOUT respectively. control. The other ends of the capacitors C1 to C3 and COUT are respectively connected to the clock signals CLK1 , XCLK1 , CLK1 and the reference voltage VSS, wherein the clock signals CLK1 and XCLK1 have the same amplitude but opposite phases. The clock signal CLK1 is also fed into the first input terminals of the first and third level shifters LS1 and LS3, and into the second input ports of the second and fourth level shifters LS2 and LS4. Similarly, the clock signal XCLK1 is fed into the first input terminals of the se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
CPCH02M2003/076H02M3/073H02M2003/075H02M3/075H02M3/07G09G3/20G09G5/00
Inventor 林孝义邱昌明陈维成
Owner TPO DISPLAY