Anisotropic Absorption Film for Pancake Lens Ghost Suppression
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Solution Overview
Problem
The application of laminated optical films in pancake lens-type virtual reality display apparatus leads to the occurrence of ghosting, which needs to be suppressed.
Innovation Solution
A light absorption anisotropic film with specific transmittance and chromaticity differences, containing a dichroic substance in a controlled arrangement, is used to form a laminate with a retardation layer and reflective polarizer, which is then integrated into a composite lens and virtual reality display apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminated optical film is applied to a pancake lens-type virtual reality display apparatus, then the optical function is improved, but ghosting occurs
Solution Approach 1:
The patent applies local quality by creating a light absorption anisotropic film with spatially varying transmittance characteristics. The film has different transmittance values at different positions (center vs. peripheral regions), with the transmittance difference controlled to be 2.5% or less. This local variation in optical properties allows the film to suppress ghosting in specific regions while maintaining overall optical functionality in the virtual reality display apparatus.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the transmittance parameter of the light absorption anisotropic film. The key parameter is the transmittance difference between the center and peripheral regions, which is controlled to be 2.5% or less. By adjusting this parameter, the film achieves optimal ghosting suppression while preserving necessary optical transmission for the display apparatus to function properly.
2Measurement precision
If the transmittance difference is reduced to suppress ghosting, then visual clarity is improved, but optical transmission may be compromised
Solution Approach 1:
The patent optimizes the transmittance parameter by controlling the transmittance difference to be 2.5% or less between center and peripheral regions. This precise parameter control ensures that the film provides sufficient optical transmission for display functionality while simultaneously achieving the uniformity needed to suppress ghosting and improve visual clarity.
Solution Approach 2:
The film exhibits local quality with position-dependent transmittance characteristics. The center region and peripheral region have different transmittance values, but the difference is controlled within 2.5%. This local variation allows the film to maintain high overall transmission while providing the uniformity needed to reduce ghosting artifacts and improve visual 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
The solution effectively suppresses ghosting in pancake lens-type virtual reality display apparatus by ensuring controlled transmittance and chromaticity variations, enhancing visual clarity.
Implementation Method 1
a light absorption anisotropic film having a curved surface portion, in which a transmittance measured by the following procedure satisfies expression (1)
Implementation Method 2
a laminated optical film including a reflective type circular polarizer, a retardation layer which converts circularly polarized light into linearly polarized light
Data Source
AI summary
A light absorption anisotropic film in which occurrence of ghost is suppressed in a case of being applied to a pancake lens-type virtual reality display apparatus. The light absorption anisotropic film of the present invention is a light absorption anisotropic film having a curved surface portion, in which a transmittance measured by a predetermined procedure satisfies the expression ΔT1=|T11−T12|≤2.5% (1).