HUD Brightness Control Using Interpupillary Length
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Solution Overview
Problem
Conventional head-up display (HUD) systems adjust brightness based on viewing distance, but users may still experience annoyance and reduced display quality due to inconsistent brightness perception.
Innovation Solution
A display control device that captures user images to recognize interpupillary length and adjusts the brightness of projected information images accordingly, allowing the information image to be superimposed on the user's intended viewing object, with the screen mounted on a vehicle's front window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If brightness of virtual image is changed according to viewing distance, then display quality and visibility are improved, but user experience deteriorates due to annoying display
Solution Approach 1:
The patent changes the parameter used for brightness adjustment from viewing distance to interpupillary length. By measuring the distance between pupils of the user's eyes, the system determines whether the user is viewing a near object (small interpupillary length) or far object (large interpupillary length), and adjusts brightness accordingly. This resolves the contradiction by providing appropriate brightness adjustment that matches user intent without causing annoyance.
2Loss of information
If information image is superimposed on viewing object, then visibility is improved, but display quality deteriorates due to inconsistent brightness perception
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the user's interpupillary length through camera-based eye tracking. This feedback information is used to dynamically adjust the brightness of the information image, ensuring that the display quality remains consistent with the user's actual viewing conditions. The closed-loop control resolves the contradiction by adapting brightness to match both visibility requirements and display quality standards.
Data Source
AI summary
A display control device for controlling an operation of a display device that projects an information image onto a screen so as to superimpose the information image on a viewing object being viewed by a user and allow the information image to be viewed by the user, the screen being disposed between the viewing object and the user, the display control device including: a user image acquisition unit that acquires an image of the user, which is captured by a camera; an interpupillary length recognition unit that recognizes an interpupillary length between left and right eyes of the user, based on the image of the user acquired by the user image acquisition unit; and an information-image display control unit that changes brightness of the information image, based on the interpupillary length.