Power supply device of liquid crystal display device

A power supply device and liquid crystal display technology, applied in static indicators, instruments, etc., can solve the problems of low power supply stability of the display power supply circuit, affecting the stability of the liquid crystal display device, damage to the liquid crystal display device, etc., to achieve stable work and protection. Security, improved stability and reliability, improved performance

Inactive Publication Date: 2019-06-28
NANJING PANDA ELECTRONICS MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the traditional liquid crystal display device, the power supply stability of the liquid crystal display power supply circuit is not high, and the charge is slow and the discharge is fast. The display device needs a stable power supply scheme for power supply, so as to ensure the normal operation of the display device
At the same time, liquid crystal devices are usually integrated circuits. Therefore, under the premise of ensuring the normal operation of liquid crystal display devices, it is necessary to provide a safe and controllable power supply solution to provide stable power supply signals for liquid crystal display control devices to avoid damage to integrated circuits and economic losses.

Method used

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  • Power supply device of liquid crystal display device
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  • Power supply device of liquid crystal display device

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Embodiment 1

[0034] Such as figure 1 As shown, the power supply device of the liquid crystal display device proposed by the present invention includes a waveform generating unit, a comparison unit, a drive control unit and a display device control unit that are electrically connected in sequence, and the waveform generation unit, the comparison unit, and the drive control unit are each connected to a Working level VIN, the output terminal of the display device control unit is connected to the liquid crystal panel unit.

[0035]The waveform generation unit receives the external input level signal VIN and generates a waveform signal of a certain frequency required by the comparison unit according to the input signal. Such as Figure 4 As shown, the waveform generating unit includes a connected hysteresis comparator and a resistance-capacitance network. The resistance-capacitance network includes resistors RK1, RK2, RK3, RK4, RK5, and CK. One end of resistors RK1, RK3, and RK4 Both are conn...

Embodiment 2

[0041] Such as image 3 As shown, the figure shows the working timing requirements of the device in the process of switching on and off the whole system. During the power-on and power-off process of the system, the anode terminal voltage of the comparator must be lower than the cathode terminal voltage to achieve stable and reliable operation of the system, otherwise it will cause excessive current inside the drive control unit and cause damage, resulting in display device control The unit does not work stably.

[0042] Specifically, during the power-on process of the system, the rate of voltage rise on the capacitor C is controlled by controlling the resistance value of the resistor R2 and the capacitance value of the capacitor C to ensure that the voltage at the anode terminal of the transistor (that is, the voltage on the capacitor C) is low The rate at which the voltage at the cathode terminal (i.e., the triangular wave voltage) changes. In this embodiment, when Vb=7.3V ...

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Abstract

The invention provides a power supply device of a liquid crystal display device. The device comprises a waveform generation unit, a comparison unit, a driving control unit, and a display device control unit which are electrically connected in sequence. The output end of the display device control unit is connected with the liquid crystal panel unit. The comparison unit comprises a comparator, a transistor, a first resistor, a capacitor, a second resistor and a third resistor, the cathode end of the comparator is connected with the waveform generation unit, and the output end of the comparatoris connected with the drive control unit. The anode end, the first resistor, the capacitor and the transistor emitter are connected to the point a, and the second resistor and the third resistor are connected with the transistor base. In the power-on and power-down processes of the system, stable and reliable operation of the system is realized by enabling the voltage of the anode end of the comparator to be lower than the voltage of the cathode end, the working state of a subsequent unit is effectively ensured, and damage to the system caused by an abnormal state is reduced. By setting the capacitor, the duty ratio of the control signal is slowly increased to a fixed value, the performance of the system is improved, and the stability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display driving, in particular to a power supply device for liquid crystal display equipment. Background technique [0002] In the traditional liquid crystal display device, the power supply stability of the liquid crystal display power supply circuit is not high, and the charge is slow and the discharge is fast. The display device needs a stable power supply scheme for power supply, so as to ensure the normal operation of the display device. At the same time, liquid crystal devices are usually integrated circuits. Therefore, under the premise of ensuring the normal operation of liquid crystal display devices, it is necessary to provide a safe and controllable power supply solution to provide stable power supply signals for liquid crystal display control devices to avoid damage to integrated circuits and economic losses. . Contents of the invention [0003] The technical problem solved ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36
Inventor 文博魏伟杜柏霖张琛冯一新
Owner NANJING PANDA ELECTRONICS MFG
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