Head-Mounted Device Dimming Module Transmittance Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted electronic devices experience poor viewing experiences due to differences in transmittance for obliquely incident and normally incident ambient light, leading to varying light intensities across different angles.
Innovation Solution
A dimming module with a specific design that maintains a transmittance difference of less than 50% between normal and oblique directions, utilizing a compensation film to equalize phase retardation and ensure consistent transmittance across different incident angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dimming module is used to reduce ambient light intensity, then the clarity of virtual image is improved, but the transmittance difference between obliquely incident and normally incident ambient light increases
Solution Approach 1:
The patent changes the optical parameters of the dimming module by introducing a compensation film with specific phase retardation characteristics. The compensation film has a phase retardation value that compensates for the angle-dependent phase retardation of the dimming module, thereby equalizing the transmittance for different incident angles while maintaining the dimming effect for improving virtual image clarity.
Solution Approach 2:
The patent creates a composite optical system by combining the dimming module with a compensation film. This composite structure integrates the light-intensity-reducing function of the dimming module with the phase-compensating function of the compensation film, achieving both improved virtual image clarity and consistent transmittance across different viewing angles.
2Reliability
If the transmittance difference between normal and oblique directions is reduced, then the viewing experience is improved, but the ability to reduce ambient light intensity may be compromised
Solution Approach 1:
The compensation film is designed with specific phase retardation parameters that counterbalance the angle-dependent phase retardation of the dimming module. By carefully selecting the phase retardation value and optical axis orientation of the compensation film, the system achieves uniform transmittance while preserving the overall dimming capability needed for virtual image clarity.
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 design enhances the viewing experience by reducing the difference in transmittance for ambient light at various angles, providing a more consistent and improved clarity of virtual images for the wearer.
Implementation Method 1
obliquely incident ambient light and normally incident ambient light have different phase retardation after passing through the dimming module
Data Source
AI summary
A head mounted electronic device includes a dimming module. The dimming module has a normal direction. The dimming module has a first transmittance T1 in the normal direction and a second transmittance T2 in an oblique direction. An included angle between the oblique direction and the normal direction is 60 degrees. The head mounted electronic device satisfies: [(T1-T2)/T1]*100%<50%.