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Now universal production of large size, are using television product under the direct light source, such as a type of CCFL Invertor (the driver needs with variable flow) technology, because of the power source, use a larger CCFL power, along with the technical improvement of the technology, which has close to limit the power to. High-end products under the direct source of the launch, LED back to reduce power consumption of a step, with high power LED and improving the efficiency of power consumption, and direct the type in. Under the straight back and a source of LED breakthrough technology, local dimming (area) is called dynamic backlighting techniques, greatly reducing the back light power, improving the TV, but the product quantity required LED contrast, the thickness of the television product is bigger, beautiful and flexibility. In light of the lateral release of large size LED light technology, set back the thin, beautiful, low power consumption. In light of lateral LED size and the back light technology, dimming local can greatly reduce the back light energy consumption. Until the LED dynamic back light and image processing, combined with the dark places lower voltage, current, or LED to drive circuit technology that is greatly reduced, but the back light energy consumption. And the lateral LED back light through cross control to achieve regional LED to a certain extent, lower power control. The lateral LED size with the back light, if the local dimming breakthrough technology, will be a raise.