Anti-reflection Film for VR Ghost Suppression
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Solution Overview
Problem
VR goggles experience visibility issues due to ghosts caused by reflected light inside the device, which are not adequately addressed by existing anti-reflection films that may introduce coloration and impair immersion.
Innovation Solution
An anti-reflection film with specific optical properties is developed, where the luminous reflectance of regular reflection light at incidence angles of 5° and 25° is 0.3% or less, and the color difference ΔE*ab between these angles is 5 or less, effectively reducing ghost visibility and coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-reflection film is provided on the surface of the optical member in VR goggles, then reflected light is suppressed, but the reflected light may be colored which impairs visibility
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of each layer in the multi-layer anti-reflection film structure. By optimizing the thickness parameters of the low refractive index layer and high refractive index layer, the film achieves minimal reflectance across multiple wavelengths simultaneously, preventing coloration while maintaining anti-reflection performance. This is accomplished by adjusting layer thicknesses to specific ranges that satisfy optical interference conditions for broad-spectrum wavelength suppression.
Solution Approach 2:
The patent employs composite materials by combining multiple layers with different refractive indices (low refractive index layer and high refractive index layer) to form a multi-layer anti-reflection film. This composite structure enables the film to suppress reflected light across a broader wavelength range compared to single-layer designs, achieving color-neutral anti-reflection by distributing the interference effect across multiple material interfaces with varying optical properties.
2Object-affected harmful factors
If conventional anti-reflection films are used in VR goggles, then some reflection is reduced, but ghost visibility remains due to coloration and insufficient suppression at various incidence angles
Solution Approach 1:
The patent applies parameter changes by optimizing multiple parameters simultaneously: layer thicknesses, refractive indices, and the number of layers. By adjusting these parameters, the anti-reflection film achieves consistent performance across different incidence angles (including oblique angles typical in VR goggles), suppressing ghost formation without introducing coloration that would compromise visibility quality.
Solution Approach 2:
The patent addresses ghost suppression by considering the three-dimensional angular distribution of reflected light. The multi-layer structure is designed to maintain effective anti-reflection performance not only at normal incidence but also at oblique incidence angles, thereby suppressing ghosts that appear when users view the display from different angles within the VR goggles.
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 anti-reflection film significantly reduces ghost visibility in VR goggles by minimizing regular reflection light and maintaining low color difference across different incidence angles, thereby enhancing image clarity and user immersion.
Implementation Method 1
a multi-layer structure including a low refractive index layer and a high refractive index layer which are laminated alternately
Implementation Method 2
the luminous reflectance of regular reflection light of light incident at an incidence angle of 5° is 0.3% or less, the luminous reflectance of regular reflection light of light incident at an incidence angle of 25° is 0.3% or less
Data Source
AI summary
The present invention provides an anti-reflection film capable of suppressing the occurrence of ghosts in VR goggles, and a polarizing plate and a display device using the same. The anti-reflection film is characterized in that the luminous reflectance of regular reflection light of light incident at an incidence angle of 5° is 0.3% or less, the luminous reflectance of regular reflection light of light incident at an incidence angle of 25° is 0.3% or less, and the color difference ΔE*ab value between the regular reflection light of light incident at an incidence angle of 5° and the regular reflection light of light incident at an incidence angle of 25° is 5 or less.