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Charge pump circuit and display panel

A technology of charge pump and circuit, applied in the field of charge pump, can solve the problem of high cost of high-voltage components

Active Publication Date: 2019-08-30
HIMAX TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of high-voltage components is relatively high, how to solve the withstand voltage problem in the charge pump is a topic of concern to those skilled in the art

Method used

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  • Charge pump circuit and display panel
  • Charge pump circuit and display panel
  • Charge pump circuit and display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] The terms “first”, “second”, etc. used herein do not specifically refer to a sequence or sequence, but are only used to distinguish elements or operations described with the same technical terms. In addition, the "coupling" used herein may mean that two elements are electrically connected directly or indirectly. That is to say, when "the first item is coupled to the second item" is described below, other items may also be disposed between the first item and the second item.

[0037] figure 1 is a circuit diagram illustrating a charge pump circuit according to an embodiment. Please refer to figure 1 , the charge pump circuit 100 includes a plurality of boost stages 110 , 120 , 130 . Each boost stage 110 , 120 , 130 has an input clock terminal CLK, a first input terminal IN1 , a second input terminal IN2 , an output clock terminal CLK_OUT and an output terminal OUT. These boost stages 110, 120, 130 are connected in series with each other. Specifically, the input cloc...

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PUM

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Abstract

The invention provides a charge pump circuit, which comprises multiple step-up stages. Each step-up stage comprises the following elements: a first switching circuit is controlled by first clock signals to enable the second end of a first capacitor to be coupled with a first input end or a second input end; a third switching circuit is controlled by second clock signals to enable the second end ofa second capacitor to be coupled with the first input end or the second input end; a second switching circuit is controlled by the potential on the second capacitor to enable the first end of the first capacitor to be coupled with the first input end or an output end; and a fourth switching circuit is controlled by the potential on the first capacitor to enable the first end of the second capacitor to be coupled with the first input end or the output end. Thus, low-voltage resisting electronic elements can be used for outputting high voltage.

Description

technical field [0001] The present invention relates to a charge pump, and in particular to a charge pump that uses a low withstand voltage electronic device to output a high voltage. Background technique [0002] Charge pumps are electronic components used to convert low voltages to high voltages. A common charge pump is based on a switched capacitor (SC) circuit, which outputs a high voltage by charging and discharging the capacitor. Such a charge pump includes one or more capacitors and metal oxide semiconductor field effect transistors (Metal Oxide Semiconductor Field Effect Transistors). Oxide Semiconductor FieldEffect Transistor, MOSFET). However, in some applications, the output voltage of the charge pump may be several times higher than the input voltage, which requires a high withstand voltage of the MOSFET. For example, a high voltage of up to 15 volts may be required in a liquid crystal display panel, which also means high voltage components and high voltage res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 刘政钦谢明学罗永杰
Owner HIMAX TECH LTD