Patent ID: 7714819
Filing Date: 2010-05-11
Classification: G02F,G09G

Abstract:
1. A liquid crystal display apparatus comprising: a liquid crystal layer using an Optically Compensated Bend (OCB) mode liquid crystal having a bend orientation and a splay orientation; a driver applying a voltage to the liquid crystal layer; a liquid-crystal driving power supply supplying power to the driver; and a switch outputting an on/off signal to the driver; wherein said liquid crystal display apparatus includes a power supply OFF sequence period which is used when a power supply of said liquid crystal display apparatus is turned off, said power supply OFF sequence period including at least a first OFF sequence period, a second OFF sequence period, and a third OFF sequence period, i) in said first OFF sequence period, when an off signal to turn off said power supply of said liquid crystal display apparatus is output from the switch, said driver applies alternating voltages with different polarity equal to or lower than a maximum voltage which can be applied to said liquid crystal layer, said applied alternating voltages exceeding a voltage of an image display region to said liquid crystal layer, ii) in said second OFF sequence period after said first OFF sequence period, the driver applies alternating voltages with different polarity equal to or higher than a critical voltage of the OCB mode liquid crystal which can be applied to each of pixels of the liquid crystal layer for a predetermined time in order to transfer said liquid crystal layer to said bend orientation, and iii) in said third OFF sequence period after said second OFF sequence period, the driver applies a voltage lower than the critical voltage of the OCB mode liquid crystal for a predetermined time in order to transfer the liquid crystal layer to said splay orientation, and thereafter supplying of power to the driver from the liquid-crystal driving power supply is stopped to turn off said power supply of said liquid crystal display apparatus.