Provided is a liquid crystal display device, including: a liquid crystal display panel; a memory for storing driving information and image data modulation information, and supplying the stored driving information and image data modulation information to a timing controller; a memory protection circuit for enhancing a write protection function of the memory, the memory protection circuit including a pull-up resistor for pulling up a write protection terminal of the memory to a power voltage, and a pad connected to the write protecting terminal and applying a low voltage to the write protection terminal; and a timing controller for reading the data stored in the memory to output various control signals for driving the liquid crystal display panel.