Abstract: According to an embodiment, the projection apparatus maintenance system is adapted for a projection apparatus having a communication interface and a projection unit. The projection unit projects a projection image according to an image data. The method comprises: transmitting a usage data corresponding to the projection apparatus to a mobile apparatus through the communication interface; transmitting the usage data to a network server through the mobile apparatus and receiving a maintenance data which is provided by the network server in correspondence to the transmitted usage data; receiving at least one maintenance command from the mobile apparatus through the communication interface; and executing a maintenance operation corresponding to the projection apparatus according to the at least one maintenance command. As a result, the maintenance efficiency of the projection apparatus can be improved.

Abstract: A three-dimensional (3D) glasses and a method for operating the same are provided. The 3D glasses includes a first lens, a second lens, an infrared receiver and a control unit. The infrared receiver receives an infrared signal to output a digital control signal. The control unit is coupled to the infrared receiver. The control unit controls a first state of the first lens and a second state of the second lens according to a first pulse of the digital control signal, where at least one of the first state and the second state is an OFF state.