| 摘要 |
A liquid crystal display device is provided in which its cold cathode fluorescent tube serving as a surface light source block can reliably light up and efficiency of feeding light to a liquid crystal panel can be enhanced. When timing signals are fed to frequency setting sections, a frequency of each of driving pulse voltages becomes as high as a frequency being near to a resonant frequency corresponding to a floating capacitance occurring at start time of lighting of backlights and then becomes as low as a frequency being near to a resonant frequency corresponding to floating capacitance occurring at a stabilized period of lighting of the backlights. Therefore, the backlight, even if lighting duration of its cold cathode fluorescent tube is long, lights up reliably and a power factor is improved to improve efficiency of feeding light to the liquid crystal panel.
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