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Public voltage generating circuit and LCD thereof

A common voltage and generating circuit technology, which is applied to static indicators, instruments, and conversion equipment without intermediate conversion to AC, etc., can solve the problems of low adjustable accuracy and complicated adjustment methods, and achieve simple and adjustable adjustment methods. The effect of small precision

Inactive Publication Date: 2008-09-03
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem that the adjustment method of the common voltage Vcom of the common voltage generation circuit in the prior art is complicated and the adjustment accuracy is not high, it is necessary to provide a common voltage generation circuit with simple output voltage adjustment and high adjustment accuracy

Method used

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  • Public voltage generating circuit and LCD thereof
  • Public voltage generating circuit and LCD thereof
  • Public voltage generating circuit and LCD thereof

Examples

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Embodiment Construction

[0019] see image 3 , is a schematic diagram of the circuit structure of the liquid crystal display of the present invention. The liquid crystal display 30 includes a control circuit 31, a scanning driving circuit 32, a data driving circuit 33, a common voltage generating circuit 34, multiple rows of scanning lines 35 parallel to each other, and multiple columns parallel to each other and insulated from the scanning lines 35 respectively. Intersecting data lines 36, a plurality of thin film transistors 37 adjacent to intersections of the scan lines 35 and the data lines 36, a plurality of pixel electrodes 38, a common electrode 39 opposite to the plurality of pixel electrodes 38, and sandwiched between the two Liquid crystal molecules between the electrodes 38 and 39 (not shown).

[0020] The control circuit 31 drives the scan driving circuit 32 , the data driving circuit 33 and the common voltage generating circuit 34 to work. The scan driving circuit 32 is used to drive th...

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PUM

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Abstract

The invention provides a common voltage producing circuit, comprising a fixed pulse producing circuit, a variable pulse producing circuit and a charge bump which receives a fixed pulse signal from the fixed pulse producing circuit and a variable pulse signal from the variable pulse producing circuit, and undergoes integration, filter treatment for the fixed pulse signal and the variable pulse signal so as to form a common voltage. The amplitude of the common voltage can changed along the change of the duty cycle of the variable pulse signal. The invention also provides a liquid crystal display with the common voltage producing circuit.

Description

technical field [0001] The invention relates to a common voltage generating circuit and a liquid crystal display adopting the common voltage generating circuit. Background technique [0002] Usually, due to the large difference in the equivalent capacitance of liquid crystal panels, the optimum common voltage Vcom of each liquid crystal panel will be different. Therefore, when designing the driving circuit of the liquid crystal panel, it is required that the common voltage range Can achieve the best public voltage. [0003] see figure 1 , is a schematic diagram of a common voltage generating circuit in the prior art. The common voltage generating circuit 10 includes a voltage input terminal 110 , a voltage output terminal 120 , two resistors 101 , 102 , two capacitors 103 , 104 and an adjustable resistor 105 . The voltage input terminal 110 receives a DC voltage output from a power supply circuit (not shown in the figure), and the DC voltage has three output branches: the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20G02F1/133H02M3/06
CPCG09G3/3655G09G3/3614
Inventor 黄顺明童建凡
Owner INNOCOM TECH (SHENZHEN) CO LTD