Patent ID: 9039206
Filing Date: 2015-05-26
Classification: H04N

Abstract:
1. A projection display apparatus, comprising: a light source; a power supply unit which receives power from an external power supply and which supplies, to the light source and a control unit, power derived from the received power, wherein the power supplied to the light source is higher than the power supplied to the control unit; a detecting unit which detects a cut-off state in which no or no sufficient power is being received by the power supply unit from the external power supply; a nonvolatile memory for storing data of the projection display apparatus; a capacitor which accumulates charges in response to power being received by the power supply unit from the external power supply, wherein the capacitor is used to supply power to the light source and the control unit; and the control unit, wherein the control unit is operable, following detection by the detecting unit of the cut-off state, to carry out a data storage operation in which at least part of the data is stored in the nonvolatile memory, wherein power necessary for carrying out the data storage operation is obtained from the charges previously accumulated by the capacitor, and wherein the control unit is operable, following detection by the detecting unit of the cut-off state, to carry out at least part of the data storage operation after turning off the light source, and wherein, in the cut-off state, the charges accumulated by the capacitor are used to supply power to the light source and the control unit before the control unit turns off the light source, and the charges are used to carry out at least part of the data storage operation after the control unit turns off the light source.