An LCD device having dual source drivers and related driving method are disclosed for performing data signal driving operation by making use of a data writing synchronous control mechanism. The operation of the data writing synchronous control mechanism includes furnishing all image data signals to both the first and second source drivers, latching odd and even image data signals by the first and second source drivers respectively, performing a signal processing process on the odd image data signals for generating a first set of analog data signals by the first source driver, performing a signal processing process on the even image data signals for generating a second set of analog data signals by the second source driver, writing the first set of analog data signals into a plurality of first pixel units, and writing the second set of analog data signals into a plurality of second pixel units.