Display device for displaying video, eyewear device for assisting in viewing video, video system with display device and eyewear device, and control method of video system

An eyewear device for switching an operation mode between a first assistance operation for assisting in viewing a stereoscopic video and a second assistance operation for assisting in viewing one of a first video and a second video, which are different in contents from each other, in response to a control signal transmitted from a display device configured to switch a display mode between a first display mode for time-divisionally displaying a left frame image, which is observed by a left eye, and a right frame image, which is observed by a right eye, to depict the stereoscopic video and a second display mode for time-divisionally displaying the first and second videos, the eyewear device comprising:

• a receiver configured to receive the control signal including a shared command signal, which is commonly used between the first and second display modes;
• a light amount adjuster which is electrically connected to the receiver and responsive to the control signal to adjust an image light amount that reaches each of the left and right eyes;
• and
• a controller which is electrically connected to the receiver and responsive to the control signal and generates a drive signal to control the light amount adjuster so that the light amount adjuster executes the first assistance operation if the control signal has four types of command signals including the shared command signal, and executes the second assistance operation if the control signal includes the shared command signal and a first unshared command signal which is different from the four types of command signals,
• wherein, while executing the second assistance operation, the light amount adjuster increases or decreases the image light amount to reach both of the left and right eyes in response to the shared command signal,
• wherein, while executing the second assistance operation, the light amount adjuster decreases or increases the image light amount to reach both of the left and right eyes in response to the first unshared command signal,
• wherein the receiver receives a stop signal including the shared command signal and a second unshared command signal which is different from the shared command signal and the first unshared command signal, and
• wherein, if the receiver repeatedly receives the stop signal, the controller controls the light amount adjuster to continue increasing the image light amounts to the left and right eyes.