Privacy Display Control via Local Brightness Adjustment
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Solution Overview
Problem
Existing display screens in privacy mode do not effectively maintain uniform brightness across different viewing angles and distances, leading to potential content leakage when bystanders view the screen from various positions.
Innovation Solution
The method involves detecting objects within a specific range of the display device, determining their relative position, and adjusting the output light parameters, such as brightness and angle, using liquid crystal elements to ensure the screen appears uniformly black from any angle, thereby preventing content exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a privacy-protection mode is activated to make the screen appear black to surrounding bystanders, then privacy protection is improved, but the brightness uniformity across different viewing angles deteriorates, allowing private content to be seen at bright areas
Solution Approach 1:
The patent divides the display screen into multiple control regions and independently adjusts the brightness of each region based on the detected position of bystanders. This local quality approach ensures that areas visible to bystanders are dimmed while the user's viewing area maintains normal brightness, achieving both privacy protection and brightness uniformity
Solution Approach 2:
The system dynamically adjusts screen brightness in real-time based on the detected position and movement of bystanders. The brightness parameters are continuously updated as bystanders move, ensuring consistent privacy protection and uniform appearance from all viewing angles throughout the privacy mode activation period
2Loss of information
If the screen brightness is reduced to prevent content leakage from side viewing angles, then privacy protection is improved, but the visibility of the screen content for the user deteriorates
Solution Approach 1:
The patent implements differential brightness control where different regions of the screen have different brightness levels. The user's viewing area maintains high brightness for clear visibility, while side regions visible to bystanders are dimmed to prevent content leakage, resolving the contradiction between privacy protection and screen visibility
3Illumination intensity
If uniform brightness is maintained across all viewing angles in privacy mode, then brightness uniformity is improved, but the effectiveness of privacy protection deteriorates as content becomes visible at bright areas
Solution Approach 1:
The system applies different brightness levels to different spatial regions rather than uniform brightness across the entire screen. Regions accessible to bystanders are dimmed while the user's viewing zone maintains normal brightness, achieving both brightness uniformity within the privacy zone and effective content obscuration from bystander perspectives
Solution Approach 2:
The system uses sensors to detect bystander positions and provides feedback to the control algorithm, which then adjusts the brightness distribution accordingly. This closed-loop feedback ensures that the brightness pattern adapts to maintain uniform appearance from all bystander angles while preserving privacy protection effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures that the screen maintains a consistent low brightness across all viewing angles, effectively preventing privacy leakage by uniformly adjusting the light transmission through liquid crystal elements based on detected positions and angles, ensuring the content remains obscured from bystanders.
Implementation Method 1
adjusting the output parameter of output light of the output device based on the first relative position relationship, to cause the output device to be in a first output state relative to the first object
Data Source
AI summary
A control method includes detecting a first object within a first range corresponding to an output device, obtaining a first relative position relationship between the first object and the output device, and adjusting an output parameter of output light of the output device based on the first relative position relationship, to cause the output device to be in a first output state relative to the first object.