Patent ID: 9377639
Filing Date: 2016-06-28
CPC Classification: G02F,H04B

Claim Text:
1. A transmitter that transmits a signal to a receiver by changing an amount of light emitted, the transmitter comprising: a liquid crystal board; a first board having translucency; a second board disposed to sandwich the first board with the liquid crystal board; and a control unit configured to, by switching transmittance of the liquid crystal board with respect to outside light between a first transmittance and a second transmittance through application, to the liquid crystal board, of a control voltage corresponding to a signal to be transmitted, change an amount of outside light reflected by the first board and emitted toward the receiver via the liquid crystal board, wherein the control unit is configured to, when switching the transmittance of the liquid crystal board to the second transmittance, maintain the transmittance of the liquid crystal board at the second transmittance until outside light that passed through the liquid crystal board is reflected by the second board and reaches the liquid crystal board via the first board, the second transmittance being lower than the first transmittance.