Patent ID: 8115720

Claim:
A liquid crystal display device comprising: a liquid crystal panel; a first printed circuit board attached to one side of the liquid crystal panel and including a mounted drive circuit configured to drive the liquid crystal display panel; a second printed circuit board including a mounted timing controller configured to supply a predetermined control signal and a predetermined data signal to the drive circuit and a mounted power supplying section configured to supply a predetermined voltage to the drive circuit; a flexible circuit board configured to supply the predetermined control signal, the predetermined data signal, and the predetermined voltage supplied from the second printed circuit board to the first printed circuit board; and a memory device mounted to the second printed circuit board, wherein the flexible circuit board includes a plurality of pads having a plurality of control pads and a plurality of data pads, the plurality of control pads and data pads are electrically connected to each other in a one to one correspondence, wherein the memory device includes a write protection element to perform a write protection function in response to a predetermined voltage supplied from an electrical passage via at least one of the flexible circuit board and the first printed circuit board, wherein the plurality of control pads include a dummy control pad, the plurality of data pads include a dummy data pad, wherein the write protection element of the memory device is connected to the dummy control pad, the predetermined voltage is supplied to the write protection element through the connected dummy control pad, wherein the dummy control pad is formed next to a last control pad of the plurality of control pads, and the dummy data pad is formed next to a last data pad of the plurality of data pads, wherein the dummy control pad is connected to the last control pad of the plurality of control pads, wherein the dummy control pad and the dummy data pad are formed on the same surface of the flexible circuit board, and wherein the memory device performs a read function by the predetermined voltage provided from the dummy control pad connected to the write protection element of the memory device.