Polarization Optical Assembly to Suppress Ghost Light
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Solution Overview
Problem
Existing optical systems in image display apparatuses, such as head-mounted displays, face challenges in maintaining high optical performance due to the use of adhesives and sticky agents in cementing optical elements, which can lead to issues like image quality reduction and ghost light generation.
Innovation Solution
The optical system employs a configuration where the first lens and intermediate layer are cemented with a sticky layer, and the second lens and intermediate layer are cemented with an adhesive layer, optimizing the number of light passes through each to minimize ghost light and enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives and sticky agents are used to cement optical elements, then the optical elements can be effectively bonded, but ghost light is generated and image quality deteriorates
Solution Approach 1:
The patent applies different types of adhesive layers (first adhesive layer and second adhesive layer with different properties) at different locations within the optical element. The first adhesive layer has different characteristics from the second adhesive layer, allowing each layer to be optimized for its specific function and location, thereby reducing ghost light while maintaining bonding strength.
2Device complexity
If optical elements are cemented together, then the optical system can be compactly structured, but light reflection at interfaces increases and optical performance decreases
Solution Approach 1:
The patent introduces adhesive layers as intermediary substances between optical elements. These adhesive layers serve as mediator materials that reduce light reflection at interfaces while maintaining the compact structure of the optical system. The adhesive layers act as transition zones that minimize optical impedance mismatches.
3Reliability
If multiple adhesive layers are used to cement optical elements, then bonding reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the adhesive structure into multiple segmented adhesive layers (first adhesive layer and second adhesive layer) with different properties and functions. This segmentation allows each layer to be optimized independently for specific bonding requirements, improving overall reliability while enabling systematic manufacturing approaches.
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 suppresses ghost light and enhances optical performance by managing the polarization state and reducing light reflection at interfaces, thereby improving image quality.
Implementation Method 1
The first lens and the intermediate layer are cemented to each other through a sticky layer. The second lens and the intermediate layer are cemented to each other through an adhesive layer.
Implementation Method 2
an intermediate layer including a polarization separation element
Data Source
AI summary
Disclosed is an optical system for guiding light from a display side to an observation side is disclosed that includes an intermediate layer including a polarization separation element, a first lens, and a second lens. The first lens and the intermediate layer are cemented to each other through a sticky layer. The second lens and the intermediate layer are cemented to each other through an adhesive layer. A number of times the light passes through the sticky layer is greater than a number of times the light passes through the adhesive layer.