Vehicle user interface system indicating operations of an operation part of a vehicle

A vehicle user interface system comprising:

• a control knob that is disposed at a position where a driver operates and that receives a plurality of operations including a tilt operation, a rotation operation, and a push operation from the driver and that provides the driver with a predetermined sense-of-touch notification recognized through a sense of touch;
• a head-up display that displays a display image on a windshield;
• and
• a controller that controls the head-up display to display a plurality of icons, which are selectable by the control knob and that changes a display mode of the icons between a first display mode and a second display mode, the icons displayed in the second display mode are displayed smaller than the first display mode, wherein
• when the controller causes the head-up display to display a selected icon, which has been selected from among the plurality of icons, to be distinguishably displayed, the controller causes the head-up display to display an operation display image associated with the selected icon, the operation display image indicating any one of the operations of the control knob to which a processing is assigned,
• the controller causes the control knob to provide a first sense-of-touch notification when the icons are displayed in the first display mode and also when the operation device is operated,
• the controller causes the control knob to provide a second sense-of-touch notification when the icons are displayed in the second display mode and also when the control knob is operated, the second sense-of-touch notification continuing for a time longer than the first sense-of-touch notification,
• the first display mode is an operation display mode,
• the second display mode is a reduction display mode,
• the controller controls the head-up display to display a display screen that includes a support information display area, a traveling information display area, and a graphical user interface area,
• the graphical user interface area of the display screen includes the plurality of icons that are selectable by the control knob,
• the controller is configured to determine whether a field-of-view secured condition is satisfied or is not satisfied,
• the controller controls the head-up display to display the graphical user interface area to display the operation display mode and the controller controls the head-up display to change from the operation display mode to the reduction display mode without changing the traveling related information display area in response to determining that the field-of-view secured condition is not satisfied,
• the controller is configured to control the control knob to provide the second sense-of-touch notification in response to a user operating the control knob while the graphical user interface area displays the reduction display mode to alert a user that operation of the plurality of icons is not permitted during the reduction display mode of the graphical user interface area,
• the display screen is a horizontally elongated rectangle displayed on a windshield of a vehicle and the traveling related information display area and the graphical user interface area are located at different corners of the display screen, and
• a total display-area of the graphical user interface area in the reduction display mode is smaller than in the operation display mode of the graphical user interface area and the total display-area of the graphical user interface area in the reduction display mode is positioned closer to a corner of the display screen than the total display-area of the graphical user interface area in the operation display mode.