Abstract: A switch circuit is disclosed. The switch circuit comprises: a hysteresis buffer, an electric switch, a first discharge resistor, a second discharge resistor, a capacitor, a feedback resistor, a first reciprocal switch, and a second reciprocal switch. When the second reciprocal switch is turned on, a power supply voltage charges the capacitor, and thus the voltage on the signal input terminal of the hysteresis buffer is decreased. Accordingly, the voltage on the signal output terminal of the hysteresis buffer is decreased, so as to turn on the electric switch. When the first reciprocal switch is turned on, the capacitor is discharged, and thus the voltage on the signal input terminal of the hysteresis buffer is increased. Accordingly, the voltage applied to the signal output terminal of the hysteresis buffer is increased, so as to turn off the electric switch.

Abstract: A switch circuit is disclosed. The switch circuit comprises: a hysteresis buffer, an electric switch, a first discharge resistor, a second discharge resistor, a capacitor, a feedback resistor, a first reciprocal switch, and a second reciprocal switch. When the second reciprocal switch is turned on, a power supply voltage charges the capacitor, and thus the voltage on the signal input terminal of the hysteresis buffer is decreased. Accordingly, the voltage on the signal output terminal of the hysteresis buffer is decreased, so as to turn on the electric switch. When the first reciprocal switch is turned on, the capacitor is discharged, and thus the voltage on the signal input terminal of the hysteresis buffer is increased. Accordingly, the voltage applied to the signal output terminal of the hysteresis buffer is increased, so as to turn off the electric switch.

Abstract: A method for automatically memorizing a picture orientation is disclosed. In this method, picture data are activated to display a picture image, and then the picture image is rotated by a display angle. After a picture feature based on the picture data is obtained, a feature record comprising the display angle and the picture feature is created. When the picture data are activated again, the feature record is provided, and then the picture image is displayed according to the feature record.

Abstract: An interface transmission structure between modules and its method comprise a central processor installed in an electronic device, a first pin and a second pin installed in the central processor and coupled respectively to a third pin and a fourth pin of at least one module. The central processor is able to receive different voltage amplitudes and to set a plurality of potential levels. The first and second pins respectively output a different output signal to each module according to each potential level, and the output signals are combined into a plurality of command messages, data messages, and status messages.