Reciprocating Filter for Head-Mounted Display Noise Reduction
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Solution Overview
Problem
Head-mounted devices for augmented and virtual reality often suffer from image noise issues due to the perception of non-pixel areas, leading to a reduced display quality and user immersion.
Innovation Solution
A head-mounted device design featuring a filter that moves reciprocally, rotates, or changes thickness to operate at frequencies higher than the critical fusion frequency, positioned between the display panel and optical system, to convert spatial noise into temporal noise, thereby reducing the perception of image noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is positioned between the display panel and optical system, then image noise perception is reduced, but device complexity increases
Solution Approach 1:
The filter is designed to move repeatedly in a direction (reciprocating motion) rather than remaining stationary. This dynamic movement converts spatial noise patterns into temporal noise that occurs above the critical fusion frequency, making the noise imperceptible to users while maintaining system functionality
Solution Approach 2:
The filter performs periodic reciprocating movement at a frequency higher than the critical fusion frequency (typically above 60Hz). This periodic action transforms the nature of the noise from spatial to temporal, exploiting human visual system limitations to eliminate noise perception without requiring complex additional components
2Object-affected harmful factors
If the filter moves reciprocally at high frequency, then noise perception is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention changes the operational parameters of the filter by implementing reciprocating motion at frequencies above the critical fusion frequency. This parameter change (from static to dynamic, from low to high frequency) transforms the noise characteristics in a way that is imperceptible to users, while the precision requirements remain manageable through standard actuation mechanisms
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
The solution effectively minimizes the recognition of image noise by the user, enhancing display quality and immersion in virtual or augmented reality experiences.
Implementation Method 1
The filter may repeatedly move at an operating frequency that is higher than a critical fusion frequency
Data Source
AI summary
A head-mounted device includes a case including a body and a cover covering the body, the case having a display panel accommodating space between the body and the cover, an optical system in the body facing the cover, and a filter in the body, the filter being spaced apart from the optical system in a first direction corresponding to a thickness direction of the optical system and being configured to repeatedly move in a direction.