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Power supply management circuit

A technology of power management and power supply voltage, applied in the direction of instruments, static indicators, etc., can solve problems such as abnormal display screen, achieve the effect of eliminating shutdown afterimage and improving efficiency

Active Publication Date: 2018-06-15
KUSN INFOVISION OPTOELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] When the power management circuit 100 in the prior art is performing a voltage drop test, when the judgment module 120 detects that the power supply voltage VDD drops, it will trigger the XON function of the gate drive circuit. When the power supply voltage VDD is increased again, the display screen is abnormal.

Method used

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Embodiment Construction

[0031] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown in the drawings.

[0032] In the following, many specific details of the present invention, such as structures, materials, dimensions, processes and techniques of components, are described for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.

[0033] image 3 A schematic structural diagram of a power management circuit according to an embodiment of the present invention is shown.

[0034] Such as image 3As shown, the power management circuit 200 of the embodiment of the present invention includes a judging module 21...

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Abstract

The invention discloses a power supply management circuit which is arranged in a display device. The display device further comprises a grid drive circuit, a source drive circuit and a pixel array. The power supply management circuit comprises a determining module, an output module and a control module; the determining module receives a power supply voltage and a backlight voltage, and determineswhether the display device is in a normal ON / OFF state or a voltage drop test according to the power supply voltage and backlight voltage; under control of the determining module, the output module outputs an enablement signal; the input end of the control module is connected with the determining module, the output end of the control module is connected with the grid drive signal to provide a triggering signal, when the triggering signal is valid, the grid drive circuit resets the pixel array, and when voltage drop test is carried out on the display device aimed at the power supply voltage, the trigger signal is invalid. Thus, the efficiency of voltage drop test can be improved, and the display device is avoided from influence on elimination of a shutdown ghost.

Description

technical field [0001] The invention relates to the field of power management circuits, in particular to a power management circuit of a display. Background technique [0002] A Liquid Crystal Display (LCD) is a display device that uses the phenomenon that the arrangement direction of liquid crystal molecules changes under the action of an electric field to change the light transmittance of a light source. Due to the advantages of good display quality, small size and low power consumption, liquid crystal displays have been widely used in display terminals such as mobile phones and large-sized display panels such as flat-panel televisions. [0003] Existing liquid crystal displays mainly include a display panel and a printed circuit board that provides various working signals for the display panel. The display panel includes a plurality of pixel units arranged in an array, each pixel unit includes a first thin film transistor and a pixel electrode, the gate of the first thin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
CPCG09G3/36G09G2320/0257G09G2330/021
Inventor 田申卢佳惠吕青柏魏玉娜
Owner KUSN INFOVISION OPTOELECTRONICS
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