Method and device for eliminating bias voltage of source driving device of liquid crystal display (LCD)

A liquid crystal display device and source-driven technology, which can be used in static indicators, instruments, etc., and can solve problems such as uneconomical benefits

Inactive Publication Date: 2011-09-28
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to eliminate the bias voltage of the source driving signal V_S, the low-pass filter 112 must be implemented with a large circuit area, which is obviously not economical.

Method used

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  • Method and device for eliminating bias voltage of source driving device of liquid crystal display (LCD)
  • Method and device for eliminating bias voltage of source driving device of liquid crystal display (LCD)
  • Method and device for eliminating bias voltage of source driving device of liquid crystal display (LCD)

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Embodiment Construction

[0032] Please refer to figure 2 , figure 2 is a schematic diagram of the process 20 of the embodiment of the present invention. The process 20 is used to eliminate the bias voltage of the source driving signal output by the source driving device in a liquid crystal display (Liquid Crystal Display, LCD). Wherein, the source driving device includes at least one chopper. Process 20 includes the following steps:

[0033] Step 200: start.

[0034] Step 202: Measure the equivalent load resistance and equivalent load capacitance of the panel of the liquid crystal display device relative to the source driver.

[0035] Step 204: Calculate the minimum effective frequency of the circuit breaker according to the equivalent load resistance and the equivalent load capacitance.

[0036] Step 206: Adjust at least one switching frequency of at least one circuit breaker according to the lowest effective frequency, so as to perform low-pass filtering on the source driving signal output by...

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Abstract

The invention relates to a method used for a liquid crystal display (LCD) to eliminate a bias voltage of a source driving device. The source driving device comprises at least one circuit breaker. The method comprises the following steps: measuring the equivalent load resistor and equivalent load capacitor of a panel of the LCD relative to the source driving device; calculating the lowest effective frequency of the at least one circuit breaker according to the equivalent load resistor and the equivalent load capacitor; and adjusting at least one switch frequency of the at least one circuit breaker according to the lowest effective frequency so as to carry out low-pass filtering on signals output by the source driving device by virtue of the panel and further eliminate the bias voltage.

Description

technical field [0001] The invention relates to a method and device for eliminating bias voltage of a source drive device in a liquid crystal display device, in particular to a method and device for performing low-pass filtering on the bias voltage through a panel of the liquid crystal display device. Background technique [0002] Liquid Crystal Display (LCD) has the characteristics of light and thin appearance, low power consumption and no radiation pollution. It has gradually replaced the traditional cathode ray tube (Cathode Ray Tube, CRT) display and is widely used in notebooks. Information products such as computers, personal digital assistants (Personal Digital Assistant, PDA), flat-screen TVs or mobile phones. The working principle of the liquid crystal display device is to use the liquid crystal molecules in different alignment states to have different polarization or refraction effects on light, so the penetration of light can be controlled through liquid crystal mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/36G09G3/20
Inventor 杨荣平张佑匡
Owner NOVATEK MICROELECTRONICS CORP
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