Abstract: Provided is a display device including a display panel, an optical sensor, a timing controller, a scan driver, a data driver, and an image controller. The timing controller controls an image refresh rate of the display panel based on are fresh rate control signal. Thus, the display device provides improved visibility.

Abstract: Provided is a display device including a display panel, an optical sensor, a timing controller, a scan driver, a data driver, and an image controller. The timing controller controls an image refresh rate of the display panel based on are fresh rate control signal. Thus, the display device provides improved visibility.

Abstract: Provided is a display device including a display panel, an optical sensor, a timing controller, a scan driver, a data driver, and an image controller. The timing controller controls an image refresh rate of the display panel based on a refresh rate control signal. Thus, the display device provides improved visibility.

Abstract: Provided is a display device including a display panel, an optical sensor, a timing controller, a scan driver, a data driver, and an image controller. The timing controller controls an image refresh rate of the display panel based on are fresh rate control signal. Thus, the display device provides improved visibility.

Abstract: Disclosed here is an air conditioner and the control method thereof comprising an outdoor unit having an outdoor heat exchanger for the heat exchanging of the outdoor air and refrigerant; at least one indoor unit corresponding to the outdoor unit and having indoor heat exchanger for the heat exchanging of the room air and refrigerant; an expansion valve installed on the refrigerant pipe connecting the outdoor heat exchanger and the indoor heat exchanger, and expanding the refrigerant; and a control device controlling the opening speed of the expansion valve in accordance with the operation modes of the indoor unit.

Abstract: There is disclosed a system for implementing a virtual solar cell, which virtually produces output characteristic of a solar cell that satisfies conditions such as insolation, temperature and so on, to embody the performance of a solar cell without having an actual solar cell array. The system includes a data detector, a controller, a power converter, and a data logging unit, to measure external environment information such as temperature, insolation and wind velocity, and solar cell output characteristic according thereto to construct a database. In the case that output characteristic of a solar cell installed in the place a user desires at the time a user wants is produced when an actual solar developing system is designed, the system of the invention generates a voltage-current model of the solar cell, suitable for that situation, to obtain the same input/output characteristics of the solar cell as those of an actual solar cell.