Liquid crystal apparatus and liquid crystal screen power supply switch control method

A technology of power supply and switch control, applied in the direction of instruments, static indicators, etc., can solve problems such as affecting user experience, voltage shock, and screen display, so as to improve user experience and avoid shocks.

Active Publication Date: 2017-02-22
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

see Figure 4 The power supply curve shown in the shutdown process adopts the existing switch control method. During the shutdown process, the power supply of the LCD screen 3 has voltage oscillations, and the power supply voltage drops from 12V to about 8.3V, and then rebounds to 12V. It cannot meet the requirements of the shutdown phase, and there will be blurred screen or abnormal display, which will affect the user experience

Method used

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  • Liquid crystal apparatus and liquid crystal screen power supply switch control method
  • Liquid crystal apparatus and liquid crystal screen power supply switch control method
  • Liquid crystal apparatus and liquid crystal screen power supply switch control method

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Embodiment Construction

[0017] The present invention will be further elaborated below in conjunction with the accompanying drawings.

[0018] see figure 2 , figure 2 It is a circuit diagram of the switch control method of the power supply of the conventional liquid crystal panel. Through careful testing and analysis of the circuit diagram, the inventors found that: when the liquid crystal screen 3 is connected to shut down, there will be oscillation phenomenon; if the liquid crystal screen 3 is disconnected to shut down, the power supply voltage of 12V will drop smoothly without oscillation phenomenon. It is considered that the 12V power supply is used to supply power to the power conversion chip (for example: DC-DC, etc.) inside the liquid crystal screen 3 . The inventor speculates that when the device is turned off, the voltage difference Vgs between the gate G and the source S of the MOS chip N103 drops slowly due to the presence of the capacitor C250 . As the differential pressure Vgs gradua...

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Abstract

The invention provides a liquid crystal apparatus and liquid crystal screen power supply switch control method. The control method comprises the following steps: using a first controlled switch with slow varying capacitance to control the connection and disconnection of the power supply with the power supply interface of the liquid crystal screen; and arranging a second controlled switch without slow varying capacitance to be in serial connection with the first controlled switch so that both can work cooperatively to control the connection and disconnection of the power supply with the power supply interface of the crystal liquid screen. With the control method of the invention, it is possible to better meet the power supply requirement of a liquid crystal screen both at the starting stage and the closing stage, therefore, improving the user's use experience.

Description

technical field [0001] The invention relates to a liquid crystal device, in particular to a switch control method for power supply of a liquid crystal screen. Background technique [0002] see figure 1 , the existing liquid crystal device 10a generally includes a liquid crystal screen 3 and a controlled switch 1 for providing power supply to the liquid crystal screen 3 for switch control. The controlled switch 1 specifically includes a power switch 11 serially arranged between the power supply PWRin and the power supply port of the liquid crystal screen 3, a driver 12 for driving the power switch 11 to be closed / open, and a power switch 11 connected to the power switch 11. A slowly variable capacitor 13 between the control port Ctrl and the input port IN of the power switch 11 . see figure 2 Shown is a circuit diagram of an existing switching control method for power supply of a liquid crystal display, the aforementioned power switch 11 is roughly composed of a P-channel...

Claims

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Application Information

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IPC IPC(8): G09G3/36
CPCG09G3/36
Inventor 刘修伦宋源清余剑雄邢胜春
Owner HISENSE VISUAL TECH CO LTD
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