Virtual Image Display Scaling for Far-Object Distance Perception
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Solution Overview
Problem
Existing virtual image display devices struggle to effectively convey the sense of distance between objects that are far away, as the size of object images decreases and their display position asymptotically approaches the vanishing point with increasing distance, making it difficult for drivers to perceive the distance between multiple far-off objects.
Innovation Solution
A virtual image display device that recognizes traffic participants as objects and displays their images on a screen with a sense of depth, using a surrounding state recognizer to acquire object position information and a display controller to switch between normal and magnification display modes based on surrounding conditions, enhancing the vertical scale for distant objects to improve distance perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If virtual images are drawn based on the laws of perspective, then a sense of depth is provided to the viewer, but the distance between far-off objects becomes difficult to perceive as their display position asymptotically approaches the vanishing point
Solution Approach 1:
The patent applies dynamics by making the display mode switchable between normal perspective mode and magnification mode. The system dynamically adjusts the vertical scale based on detected conditions (such as when multiple objects are present in the distance), allowing the display to adapt its properties to optimize distance perception for far-off objects while maintaining natural perspective when not needed.
Solution Approach 2:
The patent changes the vertical scale parameter in the display coordinate system to resolve the contradiction. By increasing the vertical scale in magnification mode, objects that would otherwise converge at the vanishing point are displayed with greater vertical separation, making distance between far-off objects perceptible while preserving the ability to switch back to normal perspective when appropriate.
2Measurement precision
If the vertical scale is increased to improve distance perception of far objects, then distance between far-off objects becomes easier to ascertain, but objects near the point of view may lose clarity
Solution Approach 1:
The system dynamically switches between normal display mode and magnification display mode based on detected conditions. When multiple objects are present in the distance or specific conditions are met, magnification mode is activated to improve far object distance perception. When not needed, the system returns to normal mode to maintain optimal display precision for near objects, thus avoiding permanent degradation of near object clarity.
Solution Approach 2:
The magnification display mode applies enhanced vertical scale specifically to address the local problem of far object distance perception, rather than uniformly affecting the entire display. This localized adjustment allows improved distance perception for distant objects while maintaining normal display quality for nearby objects when magnification is not activated.
Data Source
AI summary
The virtual image display device comprises a surrounding state recognizer that acquires a travel direction distance and a lateral direction distance to an object, and a display controller that displays object icon images I1, I2 in a screen 51. The display controller is capable of switching between displaying an image in a normal mode, in which the display positions of the images I1, I2 move closer in a lateral direction to a lateral reference line L1 as the travel direction distance increases, and move farther away in a screen vertical direction from a screen bottom line L2 as the travel direction distance increases, and displaying the image in a magnification mode, in which a vertical scale, which is the ratio of the distance between the line L2 and the display positions in the screen vertical direction to the orientation direction distance, is larger than in the normal display mode.