公开(公告)号：US20210215961A1

公开(公告)日：2021-07-15

申请号：US17135175

申请日：2020-12-28

申请人： MURAKAMI CORPORATION

发明人： Yoshihiro GOHARA ,  Noriyuki UNNO ,  Mina SUGINO

IPC分类号： G02F1/133 ,  G02F1/137 ,  G02F1/1335

摘要： A mirror display apparatus that subjects a mirror optical element to pulse voltage driving so that a reflectivity in a mirror mode can be changed by means of a duty cycle of the pulse voltage is provided. A mirror display apparatus includes a monitor display device and a mirror optical element disposed on the front side of the monitor display device. The mirror optical element includes a liquid-crystal panel with a reflection-type polarizer disposed on the back side thereof. The mirror optical element has a reflectivity and a transmissivity that are changed in respective directions opposite to each other via electric driving using a voltage applied to the liquid-crystal panel. A control circuit drives the liquid-crystal panel using a pulse voltage and performs control to change the reflectivity and the transmissivity of the mirror optical element by changing a duty cycle of the pulse voltage.