Patent ID: 8869209
Filing Date: 2014-10-21
Classification: G09G,H04L,H04N

Abstract:
1. A display device comprising: a signal receiving unit configured to receive a video signal by a differential signal from an external apparatus via a transmission path which includes a pair of differential transmission lines; an image display unit configured to process the video signal received in the signal receiving unit to display an image; a communicating unit configured to perform a communication with the external apparatus through a communication line which constitutes a predetermined line of the transmission path; a position designating unit for designating a position on a display screen of the image display unit; and an information transmitting unit configured to transmit, by the communicating unit, coordinate information on the position designated by the position designating unit to the external apparatus, wherein the communicating unit is configured to transmit a notification of a connection status by a direct current bias potential of a hot plug detect (HPD) line of a high definition multimedia interface (HDMI) and a reserve line of the HDMI as the pair of differential transmission lines, and to perform full-duplex communication with the external apparatus via the HPD line and reserve line as the pair of differential transmission lines.