3D Glasses Wave Plate Segmentation for Cost Reduction
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Solution Overview
Problem
Large-size liquid crystal display monitors require large-area ¼λ wave plates, increasing manufacturing and maintenance costs due to their larger area.
Innovation Solution
A 3D image system comprising a liquid crystal display monitor with a ½λ wave plate and 3D glasses with a first and second ¼λ wave plate, where the second ¼λ wave plate is disposed between the first ¼λ wave plate and a linear polarizer, with specific axis and thickness configurations to reduce the need for large-area components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-area 1/4λ wave plate is used in large-size liquid crystal display monitors, then the 3D image quality is maintained, but the manufacturing cost and maintaining cost increase
Solution Approach 1:
The patent divides the single large-area 1/4λ wave plate into two smaller 1/4λ wave plates. These segmented wave plates are arranged in sequence with specific orientation relationships (the slow axis of the first wave plate is parallel to the slow axis of the 1/2λ wave plate, and the slow axis of the second wave plate is perpendicular to the slow axis of the first wave plate). This segmentation reduces the area of individual components while maintaining the overall 3D image quality through coordinated optical path control.
Solution Approach 2:
The patent combines multiple optical components (1/2λ wave plate, two 1/4λ wave plates, and polarizer) into an integrated optical system. The 1/2λ wave plate and two 1/4λ wave plates work together in sequence to achieve the desired polarization transformation. This merging allows the system to use smaller individual components while achieving the same overall optical effect as a single large wave plate.
2Reliability
If a large-area 1/4λ wave plate is used in large-size liquid crystal display monitors, then the 3D image quality is maintained, but the maintaining cost increases
Solution Approach 1:
By segmenting the large wave plate into two smaller wave plates, the patent makes the system more maintainable. If one of the smaller wave plates becomes defective, it can be replaced independently without replacing the entire large component. This reduces maintenance costs and simplifies repair operations while maintaining 3D image quality through the coordinated arrangement of the wave plates.
3Ease of manufacture
If smaller area components are used, then manufacturing and maintenance costs are reduced, but the ability to maintain effective 3D image transmission may be compromised
Solution Approach 1:
The patent changes the optical path parameters by introducing specific thickness ratios between the wave plates. The thickness of the 1/2λ wave plate is designed to be twice the thickness of each 1/4λ wave plate (d1 = 2d2), and the refractive indices are coordinated (no1 = 2no2 = 2ne2). These parameter changes ensure that the smaller wave plates collectively provide the same optical path difference as a single large wave plate, maintaining 3D image transmission quality.
Solution Approach 2:
The patent uses a composite optical system comprising multiple wave plates with different thicknesses and refractive indices arranged in specific configurations. This composite structure of 1/2λ wave plate and two 1/4λ wave plates creates an equivalent optical effect to a single large wave plate while using smaller individual components, thus maintaining image quality while reducing component size.
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 reduces manufacturing and maintenance costs by using smaller area components while maintaining effective 3D image transmission, enhancing the feasibility of large-size 3D displays.
Implementation Method 1
The 1/2λ wave plate and the 1/4λ wave plate are a type of optical device, which is capable of enabling two lights perpendicular to one another to produce a phase difference during vibrations. The 1/2λ wave plate and the 1/4λ wave plate are usually made of a birefringence crystal
Implementation Method 2
The 1/4λ wave plate is a wave plate capable of enabling the o light and e light to produce an additional optical path difference of 1/4λ. When a linear polarized light is incident into the 1/4λ wave plate and θ=45 degrees, a light emitted from the wave plate is a circular polarized light.
Implementation Method 3
In contrast, after a circular polarized light passes through the 1/4λ wave plate, the circular polarized light is converted into a linear polarized light.
Implementation Method 4
a linear polarizer for filtering the linear polarized lights emitted by the second 1/4λ wave plate and transmitting the filtered lights to left and right eyes correspondingly
Data Source
AI summary
Disclosed are a 3D image system and 3D glasses. The 3D image system includes a liquid crystal display monitor and the 3D glasses. The liquid crystal display monitor includes a backlight module and a ½λ wave plate. The ½λ wave plate converts lights from by the backlight module into linear polarized lights. The 3D glasses includes a first ¼λ wave plate for receiving and converting the linear polarized lights from the ½λ wave plate into circular polarized lights, a second ¼λ wave plate for converting the circular polarized lights from the first ¼λ wave plate into linear polarized lights, and a second ¼λ wave plate for filtering the linear polarized lights from the second ¼λ wave plate and transmitting the filtered lights to left and right eyes correspondingly. The present invention saves the cost and decreases the maintaining expense.