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Inverter switch frequency compensation device and method of LCD panel display device

A switching frequency and panel display technology, which is applied to lighting devices, static indicators, instruments, etc., can solve the problems of image frequency interference and high cost, and achieve the effect of preventing electromagnetic interference

Inactive Publication Date: 2007-01-17
NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, as mentioned above, the LCD backlight (back light) inverter in the prior art, due to the influence of the switching frequency of the inverter, interferes with the image frequency, thus producing a low electric field electromagnetic interference phenomenon
In order to prevent the occurrence of the above problems, GND (grounding), etc., to improve the electromagnetic interference phenomenon EMI (Electro-Magnetic Interference), the cost required is high

Method used

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  • Inverter switch frequency compensation device and method of LCD panel display device
  • Inverter switch frequency compensation device and method of LCD panel display device
  • Inverter switch frequency compensation device and method of LCD panel display device

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Embodiment Construction

[0031] In the following, the device and method for compensating the switching frequency of the inverter of the LCD panel display device will be described in detail with reference to preferred embodiments and accompanying drawings.

[0032] figure 2 It is a schematic diagram of the inverter switching frequency compensation device of the LCD panel display device in the present invention, image 3 It is a flow chart of the inverter switching frequency compensation method of the LCD panel display device in the present invention.

[0033] The inverter switching frequency compensation device of the LCD panel display device in the present invention, refer to figure 2 , including: in order to generate the inverter voltage, a frequency generating part 220 that outputs a certain frequency inverter switching frequency to the high-frequency switching part; detect the DC level of the output frequency voltage output by the above-mentioned frequency generating part with a DC level (level)...

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PUM

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Abstract

Inverter switch frequency compensation device and method of LCD panel display device are disclosed. The device comprises a frequency generating part of an inverter switch frequency for generating inverter voltage and outputing a certain frequency to a high frequency switch part; A DC level detection part using an frenquency voltage outputed from DC level detection frequency generating part; A CPU for receiving output voltage from the DC level detection part, recognising warp of the inverter switch frequency and outputing a guaranteed an ensuring control signal of the inverter switch frequency; and a switch controller for controlling the output frequency of an ensuring frequency generating part on basis of the signal from the CPU. This invention utilizes multiplier frequency of picture frequency to reduce the interference between picture frequency, to recognise the warp of the inverter switch frequency and to ensure this warp. Therefor, expensive EMI improvement is not necessary and electromagnetic interference generated by light electric field can prevented beforehand.

Description

1. Technical field [0001] The invention relates to an inverter switching frequency compensation device and method of an LCD panel display device. 2. Background technology [0002] The inverter, which supplies power to the backlight of the LCD panel display device, receives DC voltage from the DC power supply device, and generates a high voltage through the switching of the inverter transformer to drive the LCD backlight. [0003] figure 1 It is a structural block diagram of an inverter for LCD back light in the prior art. [0004] The LCD backlight (back light) inverter in the prior art includes: DC input section 110, frequency generation section 120, high frequency switch section 130, inverting transformer 140, LCD backlight (back light) 150, feedback signal control Section 160 et al. [0005] The DC input unit 110 supplies a DC (direct current) voltage to the high frequency switch unit 130 . [0006] The frequency generator 120 generates a fundamental frequency signal ...

Claims

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Application Information

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IPC IPC(8): G02F1/133G09G3/36
CPCG02F1/133G09G3/2946H02M7/003H05B41/24
Inventor 張峻德
Owner NANJING LG TONGCHUANG COLOR DISPLAYS SYST CO LTD