Windshield Display Light Control During Seat Position Changes
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Solution Overview
Problem
Conventional vehicular display devices cause discomfort when the eyellipse range varies during switching of display positions, leading to inconsistent visual recognition of virtual and real images.
Innovation Solution
A vehicular display device that includes a control unit to detect changes in the occupant's eyellipse and turns off display light during the period of state change, ensuring seamless transitions between virtual and real image recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display position is switched between first position and second position, then the display adapts to different viewing conditions, but the eyellipse range varies causing visual discomfort
Solution Approach 1:
The control unit detects seat position changes and turns off the display light before the eyellipse completes its transition to the new position range. This preliminary action prevents the display from being visible during the intermediate state where the eyellipse spans both position ranges, eliminating visual discomfort while maintaining adaptability to different viewing conditions.
2Reliability
If the display light is continuously on during seat position changes, then the display is always visible, but the varying eyellipse causes inconsistent visual recognition
Solution Approach 1:
The display light is controlled to be periodically turned off during seat position transitions. Specifically, the light is turned off when the seat position change is detected and the eyellipse is transitioning between position ranges, then turned back on when the transition is complete. This periodic on-off action ensures consistent visual recognition while accounting for the temporary interruption in display availability during transitions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents discomfort by maintaining consistent visual recognition of images during seat position changes, enhancing user experience.
Implementation Method 1
a display unit 12 that includes a display element 121, transmits light emitted by a light source 11, and displays the display image
Implementation Method 2
a reflection unit 13 that reflects light representing the display image displayed on the display unit 12 toward the translucent member WS
Implementation Method 3
emits display light L (L1, L2) from an opening 17 toward the translucent member WS to cause a virtual image VI and a real image RI of a display image represented by the display light L to be visually recognized
Data Source
AI summary
A vehicular display device emits display light from an opening toward a windshield to cause a virtual image and a real image of a display image represented by the display light to be visually recognized and includes a display unit that includes a display element, transmits light emitted by a light source, and displays the display image, a reflection unit that reflects light representing the display image displayed on the display unit toward the windshield, and a control unit that performs a detection process to detect a state change in a seat accompanied with a change in an eyellipse Ey of an occupant, and a turning-off process to turn off the display light at least during a period from a change start to a change completion of the state change in the seat based on a detection result of the detection process.