Patent ID: 8773360

Claim:
A display device comprising: a coordinate-detector which detects a touch of a user on a display; a controller controlling display of a control panel and a main video signal received by a receiving processor on the display; a decoder decoding the main video signal to separate the main video signal into a digital video signal; a size changing device, receiving the main video signal output from the decoder, and reducing or enlarging a size of the main video signal in accordance with control signals of the controller, the size changing device reducing the size of the main video signal by thinning out digital video data of the main video signal and forming a reduced main video signal for display at a desired position on the display upon detection of a touch of the user to initiate display of the control panel, the size changing device enlarging the size of the main video signal by stopping the thinning out of the digital video data of the main video signal and forming an enlarged main video signal for display on the display upon detection of the touch of the user to erase the control panel from the display, and the size changing device reducing or enlarging the size of the main video signal by, respectively, thinning or stopping thinning of the digital video data of the main video signal upon detection of the touch of the user to display a new control panel different from a currently displayed control panel, thereby forming the reduced main video signal or the enlarged main video signal, respectively, to meet the size of the new control panel; a first processing device, connected to an output of the size changing device, the first processing device (a) forms a control panel video signal of a remote controller corresponding to the control panel, for controlling an external device, according to data supplied from the controller and (b) combines the reduced main video signal or the enlarged main video signal from the size changing device and the control panel video signal; a second processing device, connected to an output of the first processing device, which displays the combined reduced main video signal or enlarged main video signal and the control panel video signal received from the first processing device, wherein the reduced main video signal and the enlarged main signal do not overlap with the control panel video signal and the control panel video signal is displayed at a touch position based on the detection from the coordinate detector; and the controller specifies an operation key of the control panel, and the controller determines whether the specified operation key is intended for the external device.