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LAMP DRIVE CONTROL DEVICE AND METHOD AS WELL AS SIGNAL PROCESSING CIRCUIT AND LIQUID CRYSTAL BACKLIGHT DRIVING DEVICE BUILT INTO THIS
LAMP DRIVE CONTROL DEVICE AND METHOD AS WELL AS SIGNAL PROCESSING CIRCUIT AND LIQUID CRYSTAL BACKLIGHT DRIVING DEVICE BUILT INTO THIS
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机译:灯驱动控制装置和方法以及内置于其中的信号处理电路和液晶背光驱动装置
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摘要
PROBLEM TO BE SOLVED: To provide a method effective for realizing improvement of picture quality and reduction of power consumption by backlight control.;SOLUTION: Each lamp current is converted into detection PWM after being faintly smoothed, and the detection PWM is digitalized by a pulse width counter, which is subtracted from a target value, and is outputted as an input error signal after addition of non-linear characteristics, which is then integrated by a loop filter 62 to have a control signal generated by a steady-state closed loop. The steady-state control signal is then outputted to soft waveform generating parts 350-1 to 350-4 provided for each lighting block inside a drive pulse generating part 56, and is outputted to pulse conversion parts 370-1 to 370-4 as output amplitude signals after soft-start/stop waveforms are generated by each soft waveform generating part. Here, steady-state achievement signals showing achievement situations toward the steady state are outputted to an NOR circuit 344 by the soft waveform generating parts 350-1 to 350-4, and are outputted to the loop filter 62 as non-steady-state signals.;COPYRIGHT: (C)2008,JPO&INPIT
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