Abstract: A light-emitting diode (LED) display device, includes: a plurality of displaying basic-units, each of the displaying basic-units having a plurality of sub-pixel regions, on which a plurality of red LED units, a plurality of green LED units, a plurality of blue LED units, and a plurality of white LED units are selectively provided; and a control unit, performing an image reconstruction process for an input image, thereby making each of the displaying basic-units display color, color grayscale, or black-and-white grayscale; wherein in each of the displaying basic-units, the quantity of green LED units is more than or equal to the quantity of white LED units, and the quantity of green LED units is more than the quantity of blue LED units or red LED units.

Abstract: The present invention provides a photodetector, which comprises a substrate, a gate metal layer, an isolation layer, a transport layer, an insulating layer, an optoelectronic device, and a common metal layer. The gate metal layer is disposed on the substrate; the isolation layer is disposed on the gate metal layer and the substrate; the transport layer is disposed on the isolation layer; the insulating layer is disposed on the transport layer; the optoelectronic device is disposed on the transport layer but not on the gate metal layer; and the common metal layer is disposed on the optoelectronic device. In an etch-back process for removing the common metal layer, the transport layer cannot be removed. Alternatively, in another etch-back process for removing the transport layer, the isolation layer, and the layers and device on the isolation layer, the gate metal layer cannot be removed.

Abstract: An AC power supply and a method for dynamically controlling the output current thereof are disclosed. An output voltage stop signal is used to disable a DC/AC converter from outputting. During a period that the DC/AC converter stops its output, the output current of the DC/AC converter is measured and is fed back to a output current control device as an output current feedback signal to produce a deviation. Using the difference between the output current feedback signal of the DC/AC converter and the deviation, an approximate DC value of the output current of the DC/AC converter is calculated. With reference to the approximate DC value, the DC/AC converter can be controlled so that the DC current injection in the output current is approximately zero.

Abstract: An AC power supply and a method for dynamically controlling the output current thereof are disclosed. An output voltage stop signal is used to disable a DC/AC converter from outputting. During a period that the DC/AC converter stops its output, the output current of the DC/AC converter is measured and is fed back to a output current control device as an output current feedback signal to produce a deviation. Using the difference between the output current feedback signal of the DC/AC converter and the deviation, an approximate DC value of the output current of the DC/AC converter is calculated. With reference to the approximate DC value, the DC/AC converter can be controlled so that the DC current injection in the output current is approximately zero.