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Power supply device of thin film transistor liquid crystal display

A technology of liquid crystal display and power supply device, which is applied in the direction of conversion equipment without intermediate conversion to AC, and can solve the problems of high cost of power supply device printed circuit boards, etc.

Inactive Publication Date: 2012-02-22
CPT TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cost of the power supply unit is high and a printed circuit board with a large area is required

Method used

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  • Power supply device of thin film transistor liquid crystal display
  • Power supply device of thin film transistor liquid crystal display
  • Power supply device of thin film transistor liquid crystal display

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Embodiment Construction

[0056] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments and related drawings.

[0057] Please refer to figure 1 , figure 1 It is a schematic diagram illustrating a power supply device 100 for a thin film liquid crystal display according to an embodiment of the present invention. The power supply device 100 includes a printed circuit board 102 , a first voltage generating circuit 104 , a glass panel 106 , a positive charge pump 108 and a negative charge pump 110 . The first voltage generation circuit 104 is formed on the printed circuit board 102 for generating a first voltage VDDA and a pulse width modulation signal PWM; the positive charge pump 108 is formed on the glass panel 106 for receiving the first The voltage VDDA and the pulse width modulation signal PWM, and output the double voltage VDDG2X and the triple voltage VDDG3X...

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Abstract

The invention relates to a power supply device of a thin film transistor liquid crystal display. The power supply device comprises a printed circuit board, a first voltage generating circuit, a glass panel, a positive charge pump and a negative charge pump. The first voltage generating circuit is formed on the printed circuit board and is used for generating a first voltage and a pulse width modulation signal; the positive charge pump is formed on the glass panel and is used for receiving the first voltage and the pulse width modulation signal and outputting at least one doubled voltage of the first voltage; and the negative charge pump is formed on the glass panel and is used for receiving the pulse width modulation signal and outputting a negative voltage according to the pulse width modulation signal.

Description

technical field [0001] The present invention relates to a power supply device, especially a power supply device for a thin film liquid crystal display integrating a positive charge pump and a negative charge pump to a glass panel. Background technique [0002] When operating the thin film liquid crystal display, the power supply unit of the thin film liquid crystal display needs to provide different voltages to the thin film liquid crystal display. Therefore, the power supply device must use a power drive unit to generate pulse width modulation control signals. Then, the first voltage generation circuit generates a first voltage (VDDA) according to the input voltage and the PWM control signal. [0003] [0004] After the first voltage (VDDA) is generated, the power supply device uses the positive charge pump and negative charge pump to generate and output the double voltage (VDDG) and negative voltage (VEEG) of the first voltage to control the opening and closing of the th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 刘纯汉傅渼棋陈鉴文
Owner CPT TECH GRP