Head-Mounted Display Brightness Control From Eye Opening Detection
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Solution Overview
Problem
Existing head-mounted devices, such as those described in Japanese Unexamined Patent Application Publication No. 2008-209610, fail to adequately reduce power consumption when a user is not actively viewing the display, especially when their eyes are closed or blinking.
Innovation Solution
A head-mounted device equipped with a detection unit to monitor the degree of eye opening, a display with a light-emitting unit, and a controller that adjusts the brightness of the light emission based on the detected eye opening, thereby reducing power consumption by turning off or dimming the backlight when the eye is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight is continuously turned on to ensure display visibility, then the display visibility is maintained, but the power consumption increases
Solution Approach 1:
The backlight brightness is dynamically adjusted based on real-time eye opening detection. The system transitions from a static on/off state to a dynamic state where brightness levels (first brightness, second brightness, or off) are continuously adapted according to the detected eye opening degree, resolving the contradiction between maintaining visibility and reducing power consumption
Solution Approach 2:
The system implements a feedback loop where the detection unit continuously monitors eye opening degree and provides real-time feedback to the controller. Based on this feedback, the controller adjusts the backlight brightness accordingly, ensuring display visibility is maintained when needed while reducing power consumption when the eye is closed
2Use of energy by moving object
If the backlight is turned off to reduce power consumption during eye closure, then power consumption is reduced, but the display becomes invisible when the eye opens
Solution Approach 1:
The system performs preliminary action by detecting eye opening in advance and proactively adjusting the backlight brightness before the user actually needs to view the display. When the detection unit detects eye opening, the controller immediately transitions the backlight from off state to first or second brightness state, ensuring visibility is restored without delay
Solution Approach 2:
The system uses dynamic brightness adjustment with multiple brightness levels (first brightness for normal viewing, second brightness for transition, or off for power saving). This dynamic approach allows smooth transitions between states, maintaining fast response time while effectively managing power consumption during eye closure and opening cycles
3Illumination intensity
If the backlight brightness is continuously maintained at high level, then the display visibility is ensured, but the power consumption increases
Solution Approach 1:
The system applies local quality by providing different brightness levels to different time periods based on eye state. Instead of uniform high brightness continuously, the backlight receives localized quality adjustments: first brightness when eye is open, second brightness during transition, or off during eye closure, thereby reducing overall power consumption while maintaining necessary visibility
Solution Approach 2:
The system dynamically adjusts backlight brightness between multiple levels (first brightness, second brightness, or off) based on real-time eye opening detection. This dynamic adjustment ensures high illumination intensity only when needed (when eye is open) while reducing or eliminating brightness during eye closure, resolving the contradiction between maintaining brightness and reducing power consumption
Data Source
AI summary
A head-mounted device includes a detection unit that detects a degree of opening of an eye, a display including a light-emitting unit that emits light, and a controller that controls a brightness of the light based on the degree of opening.