Head-Mounted Display Brightness Control Using Pupil Diameter
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Solution Overview
Problem
Existing head-mounted display devices have poor automatic adjustment of display brightness due to inaccurate identification of light entering the user's eyes, leading to poor display effects in varying ambient light conditions.
Innovation Solution
A method and device that utilize an eyeball tracking camera to acquire eye information, divide the display area into two regions based on pupil diameter, and adjust display brightness accordingly to match the user's eye conditions, preventing positive feedback and ensuring accurate brightness adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If ambient light sensors are used to collect ambient brightness, then the device can automatically adjust display brightness, but the adjustment effect is poor because the sensors cannot accurately identify the brightness entering into the user's eyes
Solution Approach 1:
The patent divides the display area into multiple regions (first display area, second display area, etc.) corresponding to different eyeballs and pupils. By segmenting the display area and measuring brightness in each region separately, the system achieves more precise measurement of the actual brightness entering each eye, resolving the contradiction between automation and measurement precision.
Solution Approach 2:
The patent introduces an intermediary measurement approach by using the relationship between pupil diameter and display brightness as a reference. Instead of directly measuring ambient light, the system uses pupil diameter changes as an intermediary indicator to infer the actual brightness perception, thereby improving measurement accuracy while maintaining automatic adjustment capability.
2Device complexity
If display brightness is adjusted based on ambient light only, then the adjustment process is simple, but the virtual image becomes unclear when external light is too strong or too dark
Solution Approach 1:
The patent replaces the simple ambient light sensing mechanism with a more sophisticated system that incorporates eyeball tracking cameras, pupil diameter detection, and multi-region brightness measurement. This substitution of the measurement mechanism improves display effect reliability across varying light conditions, while the system manages complexity through automated algorithms that establish relationships between pupil diameter and display brightness.
3Measurement precision
If the display brightness is adjusted continuously based on real-time pupil diameter changes, then the brightness accuracy is improved, but the system may enter positive feedback loops causing instability
Solution Approach 1:
The patent applies preliminary anti-action by introducing damping mechanisms and stability constraints in the brightness adjustment algorithm. Before making brightness adjustments based on pupil diameter changes, the system evaluates whether adjustments are necessary and applies correction factors to prevent excessive or oscillating adjustments, thereby preventing positive feedback loops while maintaining accurate brightness control.
Data Source
AI summary
Disclosed in some embodiments of the present disclosure is a method for adjusting the display brightness of a head-mounted display device. The method comprises: acquiring eye information of a wearer; acquiring data of the pupil diameter of a first eyeball according to the eye information; dividing a display area of a head-mounted display device into a first display area corresponding to the first eyeball and a second display area corresponding to a second eyeball according to the eye information; and calculating a corresponding first display brightness according to the data of the pupil diameter of the first eyeball, and adjusting the display brightness of the second display area to the first display brightness. By means of the method for adjusting the display brightness of a head-mounted display device, a change in the brightness for the eyes of a wearer can be accurately acquired, thereby guaranteeing the accuracy of brightness adjustment.