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Quick power-down circuit

A technology of voltage following circuits and circuits, applied to instruments, static indicators, etc., can solve problems such as after-images after shutdown, and achieve the effect of eliminating after-images and enhancing the effect of power-off

Pending Publication Date: 2019-12-20
GUANGDONG CHANGHONG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In related technologies, the application and design of metal oxide TFT-LCD has become more and more mature, but there is a problem of afterimage when the machine is turned off.

Method used

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Embodiment Construction

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] In the description of the present invention, if there are descriptions of first, second, third, fourth, etc., it is only for the purpose of distinguishing technical features, and it cannot be understood as indicating or implying relative importance or implicitly indicating the indicated The number of technical features or implicitly indicates the sequence of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting and connecting should be unders...

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Abstract

A quick power-down circuit comprises: a main power-down circuit, wherein the main power-down circuit is provided with a first input end used for being connected with a VCOM _ C end, a second input endused for being connected with a VCOM end and an output end used for being connected with a VCOM _ D end, and the main power-down circuit is used for turning off the voltage of the VCOM end and quickpower-down of the VCOM _ D end; a voltage following circuit, wherein the voltage following circuit is provided with a first output end used for being connected with a VCOM _ L end, a second output endused for being connected with a VCOM _ R end, an input end used for being connected with a VCOM _ D end and used for outputting voltage to a display screen in a voltage following mode; and an auxiliary power-down circuit, wherein the input end of the auxiliary power-down circuit is connected with the output end of the main power-down circuit and the first output end and the second output end of the voltage follower circuit, and the auxiliary power-down circuit is used for quick power-down of the VCOM _ D end, the VCOM _ L end and the VCOM _ R end. Rapid power down from the source is achievedthrough the main power down circuit, the power down effect is further enhanced through the auxiliary power down circuit, and the purpose of thoroughly eliminating ghost shadows is achieved; after theembodiment of the invention is added, the power failure time is shortened to 239.3 us from the original about 20.24 ms.

Description

technical field [0001] The invention belongs to the field of displays, and in particular relates to a fast power-off circuit. Background technique [0002] The 21st century is the era of flat panel display in the field of display, and the vast majority of flat panel display devices are active matrix liquid crystal display devices (AMLCD). The introduction of thin-film transistor (TFT) switching elements in AMLCD pixels can greatly improve the performance of display devices. Traditional amorphous silicon thin-film transistors have low mobility and strong photosensitivity. application in a wider range. Using metal oxide semiconductors as the active layer to make TFTs for flat panel displays can not only obtain high mobility, but also has a simple manufacturing process, showing great application prospects. [0003] In related technologies, the application and design of metal oxide TFT-LCDs have become more and more mature, but there is a problem of residual image when the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/3677G09G2320/0257
Inventor 李戡梁平茂李铭
Owner GUANGDONG CHANGHONG ELECTRONICS