Patent ID: 8842237

Claim:
A liquid crystal display device, comprising: a liquid crystal display panel; a first back light module (BLU), disposed below the liquid crystal display panel for emitting light; a polarizer, disposed on the first BLU, to convert the light from the first BLU into a first light; a second BLU, disposed between the liquid crystal display panel and the first BLU for emitting a second light, the second BLU turned off when the first BLU turned on, and the second BLU turned on when the first BLU turned off; and a pattern retarder, disposed between the liquid crystal display panel and the first BLU, the pattern retarder comprising a plurality of first polarizing regions and a plurality of second polarizing regions arranged in an interlaced order, and a polarization state of the first polarizing region being orthogonal to a polarization state of the second polarizing region.