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Scaler having electro-magnetic interference reduction scheme for driving Liquid Crystal Display
Scaler having electro-magnetic interference reduction scheme for driving Liquid Crystal Display
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机译：具有电磁干扰降低方案的洁牙机，用于驱动液晶显示器
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摘要
A scaling device for driving a liquid crystal display device to reduce the electromagnetic interference is disclosed. A scaling device in accordance with the present invention, and outputs the spread spectrum in the PLL, the multi-phase voltage controlled oscillator is the response to the output voltage of the loop filter to the oscillation, and the scaler pixel clock signal and the phase is different plurality of oscillating signals . In this way, the spread spectrum processor when the frame rate is adjusted such that the horizontal sync signal is activated, counts the reference pixel clock signal according to the decoded signal that increases by one each time a predetermined number of, optionally, the oscillating signal which is the corresponding the outputs as one order. This will ensure that the different phases from each other the oscillating signal (CK0 ~ CK6) is outputted groups main divider M are dispensed, the dispensing main divider signal (MOK) is input to the phase frequency detector. The phase frequency detector is different to the oscillating signal (CK0 ~ CK6) is, different output a phase difference signal is compared with the pre-divider signal (PINCK) repeatedly as repeated input. Then, the frequency of the scaler pixel clock signal is shown differently repeatedly spread spectrum. Accordingly, in the PLL within the scaling device using a multi-phase VCO, it is possible to perform a spread spectrum function, the frequency non-conforming (Mismatch) problem, there is no such spread spectrum effect reduction problem, referred to the human brightness difference caused problems, the chip size It can be reduced.
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