Dynamic Display Brightness Control for Head-Mounted Displays
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Solution Overview
Problem
Existing display systems lack efficient usability in cooperative operations between devices and head-mounted display apparatus, particularly in adjusting display brightness and voice signal processing based on user interactions and environmental conditions.
Innovation Solution
A display system comprising a device and a transmissive type head-mounted display apparatus that includes sensors for detecting user interactions and environmental conditions, allowing the device to control display brightness and voice signal processing dynamically, such as reducing brightness when the display is coupled to the head or during incoming calls, and increasing brightness when decoupled or in specific environmental states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the device display unit maintains high brightness for visibility, then the display is easily seen, but it causes discomfort to the user's eyes when worn close to the head
Solution Approach 1:
The display brightness is made dynamically adjustable based on the coupling state. When the head-mounted display apparatus is coupled to the device, the brightness is reduced to a lower level; when decoupled, the brightness returns to normal. This dynamic adjustment resolves the contradiction by adapting brightness to the specific usage context.
Solution Approach 2:
The brightness parameter of the device display unit is changed based on detection values from sensors. The system detects whether the head-mounted display is worn on the head and adjusts the brightness parameter accordingly, reducing it when worn to prevent eye discomfort while maintaining visibility when not worn.
2Ease of operation
If the system automatically adjusts display settings based on sensor detection, then usability is improved, but the device complexity increases
Solution Approach 1:
The system performs self-service by automatically detecting the coupling state through sensors and adjusting display settings without requiring manual user input. The device monitors its own state and makes appropriate adjustments, improving usability while keeping the interaction model simple despite the added automation capabilities.
Solution Approach 2:
The system implements feedback loops where sensors detect physical states (coupling, head mounting) and this information feeds back to the control unit, which then adjusts display parameters. This feedback mechanism enables automatic adaptation to usage conditions, improving ease of operation through context-aware behavior.
3Reliability
If the voice signal output is changed to the head-mounted display, then audio privacy is improved, but the device complexity increases
Solution Approach 1:
The voice signal output destination is dynamically switched based on the coupling state. When the head-mounted display is coupled, the audio output is redirected to the device's speaker or headphone jack; when decoupled, it returns to the original output. This dynamic routing provides audio privacy when needed while managing complexity through state-based control.
Data Source
AI summary
A display system includes an HMD including an image display unit worn by a user on a head and transmitting external light, a six-axis sensor and a proximity sensor provided in the image display unit, and a detected value output unit configured to output, to a personal digital assistant, detected values from the sensors, an image output unit configured to output an image, a display unit configured to display the image, an acquisition unit configured to acquire the detected values from the sensors output by the HMD, and a device control unit configured to control display of the display unit, based on the detected values acquired by the acquisition unit.