Vehicle Cabin Display Size Control for Motion Sickness

The patent applies dynamics by making the projection size adjustable rather than fixed. The control apparatus dynamically changes the projection size based on detected viewer conditions (seated or standing). When the viewer is detected to be standing, the system reduces the projection size to prevent motion sickness. When seated, the system can provide a larger projection size for better viewing experience. This dynamic adjustment resolves the contradiction between large screen area and prevention of harmful visual effects.

The patent applies parameter changes by expanding the control parameters beyond just screen height to include projection size. The control apparatus detects viewer position and uses this information to adjust multiple parameters: screen height (vertical position) and projection size (display area). This multi-parameter control approach ensures that when viewers are standing, both the height and size are adjusted to appropriate levels to prevent motion sickness, whereas previous solutions only adjusted height. This resolves the limitation where height adjustment alone was insufficient to prevent visually induced motion sickness.