Optical link supporting display port

An optical link connected between a display source and a display sink forming a display port system, the optical link forming a main link for transmitting main data including video information, an auxiliary channel for transmitting auxiliary data for setting of the main link and a hot plug detection (HPD) line for transmitting an HPD signal of the display sink, wherein the auxiliary channel comprises:

• a first transmission line configured to transmit a request by the display source from the display source to the display sink, and a second transmission line configured to transmit a response by the display sink from the display sink to the display source, and
• the optical link is configured to:
• i) prior to the request by the display source, transmit a second control signal for switching a connection of the display sink from the second transmission line to the first transmission line;
• and
• ii) prior to the response by the display sink, transmit a first control signal for switching a connection of the display source from the first transmission line to the second transmission line,
• wherein the optical link further comprises;
• a first control logic connected to be adjacent to the display source and configured to transmit the first control signal;
• and
• a second control logic circuit connected to be adjacent to the display sink and configured to transmit the second control signal,
• wherein the first control logic circuit is configured to delay the request by the display source and transmit the second control signal prior to the request by the display source, and
• the second control logic circuit is configured to delay the response by the display sink and transmit the first control signal prior to the response by the display sink, and
• wherein the first control logic circuit stores the auxiliary data related to the rendering of the display sink and the auxiliary data with respect to the setting of the main link, and when the HPD signal is recovered according to normal reconnection of the display sink after a change in the HPD signal according to a connection state of the display sink, the first control logic circuit transmits the stored auxiliary data related to the rendering of the display sink and the stored auxiliary data with respect to the setting of the main link toward the display source in response to the request of the display source.