An overdriving value generating method adapted to a liquid crystal display (LCD) is provided. The overdriving value generating method includes the following steps. A current gray value and a previous gray value are received. A first gray reference value and a second gray reference value closed to the current gray value, and a first previous gray reference value and a second previous gray reference value closed to the previous gray value, and four first overdriving values are obtained according a look-up table (LUT). A target overdriving value corresponding to the current gray value and the previous gray value is obtained through a four dots interpolation operation or a parallelogram interpolation operation according to the current gray value, the previous gray value, the first gray reference value, the second gray reference value, the first previous gray reference value, the second previous gray reference value, and the first overdriving values.
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