Backlight system with lamp tube current balance and feedback mechanism and its related method
A technology of backlight system and current balance, applied in the field of backlight system, can solve the problems of capacitance error of first capacitor 280a and second 280b, different current of lamp 240, liquid crystal display panel unable to accurately display images, etc., so as to avoid damage to the system Effect
Active Publication Date: 2008-08-06
AU OPTRONICS CORP
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Problems solved by technology
[0006] However, due to the difference in component characteristics, such as the capacitance error of the first capacitor 280a and the second capacitor 280b, or the winding error of the first transformer 220a and the second transformer 220b, the current supplied to the two ends of the lamp tube 240 will be different.
In addition, regardless of whether the lamp 240 is a cold-cathode fluorescent lamp (Cold-Cathode Fluorescent Lamp, CCFL) or an external electrode lamp (External Electrode Fluorescent Lamp, EEFL), it is a high-voltage drive element, so it is easy to cause parasitic damage to the lamp. The high voltage of the capacitor causes the phenomenon of leakage current, which causes the current at the two ends of the lamp tube 240 to be different
When the currents at both ends of the lamp tube 240 are different, the lamp tube 240 cannot emit light evenly, which will cause the liquid crystal display panel to fail to accurately display the image to be output.
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[0071] In order to make the present invention more obvious and easy to understand, the backlight system with lamp current balance and feedback mechanism and its related methods according to the present invention will be described in detail below with specific embodiments in conjunction with the attached drawings. However, the provided embodiments It is not intended to limit the scope covered by the present invention, and the numbering of the steps of the method flow is not used to limit the order of execution. Any method that is recombined from the execution flow of the method steps and has the same effect is all covered by the present invention. range.
[0072] FIG. 3 is a schematic diagram of a first embodiment of a backlight system with a lamp current balance and feedback mechanism according to the present invention. As shown in Figure 3, the backlight system 300 includes a lamp tube 340, a first transformer 330a, a second transformer 330b, a first capacitor 380a, a second ...
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The invention relates to a backlight system having a light tube current balancing and feedback mechanism and a method for implementing the same. The backlight system uses the light tube current balancing and feedback mechanism to balance an input current and an output current of a light tube. The method for implementing the backlight system comprises: using a first transformer coupled light tube to input an current to create a first balance current; using a second transformer coupled light tube to create a second balance current; coupling the first transformer and the second transformer to actually equalize the first balance current and second balance current; using a feedback circuit to generate a feedback signal according to the first balance current and a second balance current; using a pulse width modulating signal generating circuit to generate a pulse with modulating signal according to the feedback signal; and using the drive circuit to drive the input current and the output current of the light tube.
Description
technical field [0001] The invention relates to a backlight system and its related method, especially to a backlight system with lamp current balance and feedback mechanism and its related method. Background technique [0002] A liquid crystal display (Liquid Crystal Display, LCD) is a flat panel display widely used at present, and it has the characteristics of light and thin appearance, power saving and no radiation pollution. The working principle of the liquid crystal display device is to change the alignment state of the liquid crystal molecules in the liquid crystal layer by changing the voltage difference between the two ends of the liquid crystal layer to change the light transmittance of the liquid crystal layer, and then cooperate with the light source provided by the backlight system to display images. [0003] Generally speaking, the backlight system of a liquid crystal display device is arranged on the bottom or side of the liquid crystal display panel, and utili...
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IPC IPC(8): H05B41/24G09G3/36G05F1/625G02F1/13357G02F1/1335
Inventor 黄衍晨孙嘉宏林晃蒂卓源斌
Owner AU OPTRONICS CORP