Polarization Adjustment Member Assembly for Thermal Warp Control
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Solution Overview
Problem
Existing virtual image display devices face issues with deformation of the polarization adjustment member due to temperature changes, leading to unintended warpage and potential optical action unevenness.
Innovation Solution
The virtual image display device incorporates a polarization adjustment member with a polarizing plate and a support plate bonded such that their residual stress directions coincide, limiting deformation and maintaining optical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the polarizing plate is bonded to the support plate without aligning residual stress directions, then the assembly process is simpler, but deformation and warpage occur due to temperature changes
Solution Approach 1:
The patent applies preliminary action by pre-aligning the residual stress directions of the polarizing plate and support plate before bonding. This preliminary alignment of stress directions prevents subsequent deformation and warpage caused by temperature changes, thereby solving the technical contradiction between ease of manufacture and stability of composition.
2Reliability
If the residual stress directions of the polarizing plate and support plate are aligned, then deformation is limited and optical stability is maintained, but the alignment process increases manufacturing complexity
Solution Approach 1:
The patent applies parameter changes by controlling the orientation parameter of residual stresses in the polarizing plate and support plate. By adjusting and aligning the stress direction parameters during manufacturing, the patent achieves limited deformation and maintained optical stability, resolving the contradiction between reliability and device complexity.
3Adaptability or versatility
If temperature changes occur in the polarization adjustment member, then the device adapts to environmental conditions, but unintended warpage and optical action unevenness occur
Solution Approach 1:
The patent applies preliminary anti-action by pre-aligning the residual stress directions of the polarizing plate and support plate before bonding. This preliminary alignment creates a compensatory effect that counteracts the warping tendency caused by temperature changes, thereby maintaining optical uniformity and resolving the contradiction between adaptability and manufacturing precision.
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 configuration effectively limits deformation and maintains optical stability, ensuring consistent display quality and reducing the occurrence of local unevenness in the virtual image.
Implementation Method 1
a first residual stress direction of the polarizing plate is along a second residual stress direction of the support plate
Data Source
AI summary
A virtual image display device includes a polarization adjustment member that includes a polarizing plate and a support plate. The polarizing plate has a property of blocking a light which is oscillated in an axial direction of a block axis while the polarizing plate is in a state where a residual stress, a degree of which is maximized in a first residual stress direction along a plane of the polarizing plate, is left in the polarizing plate. The support plate supports the polarizing plate while the support plate is in a state where a residual stress, a degree of which is maximized in a second residual stress direction along a plane of the support plate, is left in the support plate. The polarizing plate and the support plate are bonded together such that the first residual stress direction is along the second residual stress direction.