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Power supply and discharge circuit of liquid-crystal display

A liquid crystal display and discharge circuit technology, which is applied to static indicators, instruments, etc., can solve the problems of display power supply and discharge circuit wiring complexity, etc., and achieve the effect of simple wiring

Inactive Publication Date: 2008-11-26
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the shortcomings of the complex wiring of the liquid crystal display power supply and discharge circuit in the prior art, it is necessary to provide a liquid crystal display power supply and discharge circuit with relatively simple wiring

Method used

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  • Power supply and discharge circuit of liquid-crystal display
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  • Power supply and discharge circuit of liquid-crystal display

Examples

Experimental program
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Embodiment Construction

[0019] see figure 2 , is a schematic diagram of the first embodiment of the liquid crystal display power supply and discharge circuit of the present invention. The liquid crystal display power supply and discharge circuit 20 includes a control signal input terminal 210, a discharge terminal 220, a 5V DC power supply 230, an NPN bipolar transistor 240, a P channel enhancement mode MOS field effect transistor 250, a current limiting resistor 245, a bias resistor 255, and a discharge resistor 266. The control signal input terminal 210 provides a control signal, and the control signal is a logic high level or a logic low level. The supply and discharge end 220 supplies power and discharges the liquid crystal display according to the control signal.

[0020] The base b of the NPN bipolar transistor 240 is connected to the control signal input terminal 210 via the current limiting resistor 245 , the emitter e is grounded, and the collector c is connected to the 5V DC power supply...

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PUM

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Abstract

The invention discloses a LCD power supply and discharge circuit, comprising: a power supply, a control signal input end, a power supply and discharge end, a discharge resistor, an NPN bipolar transistor and P-channel enhanced MOSFET, where the NPN bipolar transistor's base is connected to the control signal input end, the emitter of the NPN bipolar transistor is earthed, and the collector of the NPN bipolar transistor is connected via a bias resistor to the power supply; the P-channel enhanced MOSFET's grid is connected to the collector of the NPN bipolar transistor, the source of the P-channel enhanced MOSFET is connected to the power supply and the drain of the P-channel enhanced MOSFET is connected to the power supply and discharge end; the power supply and discharge end is earthed via the discharge resistor.

Description

technical field [0001] The invention relates to a liquid crystal display power supply and discharge circuit. Background technique [0002] Liquid crystal displays are widely used in fields such as portable DVDs, visual music players, mobile phones, and notebook computers due to their thinness, low power consumption, and low radiation. Usually, a liquid crystal display includes a power supply circuit to supply power to it. In addition, since the internal circuit of the liquid crystal display is a capacitive load, the liquid crystal display still has a large amount of residual charge after the power is turned off, so the liquid crystal display also needs a discharge circuit to release the remaining charge. [0003] see figure 1 , is a schematic diagram of a liquid crystal display power supply and discharge circuit in the prior art. The liquid crystal display power supply and discharge circuit 10 includes a control signal input terminal 110, a discharge terminal 120, a 12V D...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/36
Inventor 屠家辉周通
Owner INNOCOM TECH (SHENZHEN) CO LTD