Projection Display Thermal Management via Segmented Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing thermal burden on polarizers and λ/2 wavelength plates in projection display apparatuses due to advancements in light sources and liquid crystal panels leads to reduced lifespan, and increasing the number of glass substrates results in larger size, higher cost, and alignment accuracy issues.
Innovation Solution
A projection display apparatus with a configuration of multiple optically transmissive substrates, including polarizers and λ/2 wavelength plates, where the second substrate is adhered to the prism, allowing for reduced distance between liquid crystal panels and the prism, and enabling rotation for axis alignment, thereby distributing thermal burden and maintaining alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of glass substrates is increased to reduce thermal burden on polarizers and λ/2 wavelength plates, then the thermal burden on each substrate is reduced, but the distance between liquid crystal panels and XDP increases, requiring a longer back focus and more lenses, which increases apparatus size and cost
Solution Approach 1:
The patent divides the thermal burden management into multiple stages by using multiple glass substrates (first, second, and third substrates) positioned at different locations between the liquid crystal panels and XDP. Each substrate handles a portion of the thermal load, distributing the stress and extending component lifespan while maintaining a compact overall structure through strategic positioning.
Solution Approach 2:
The patent optimizes the spatial arrangement of multiple glass substrates along the optical path, utilizing the depth dimension between liquid crystal panels and XDP to position substrates at specific intervals. This dimensional optimization allows thermal management without proportionally increasing apparatus volume, as substrates are layered rather than spread laterally.
2Temperature
If the number of glass substrates is increased to reduce thermal burden, then thermal burden for each polarizer or λ/2 wavelength plate is reduced, but the distance between liquid crystal panel and XDP becomes longer, requiring increased back focus and more lenses
Solution Approach 1:
The thermal management function is segmented across multiple glass substrates positioned at different locations in the optical path. The first substrate is near the liquid crystal panels, the second is intermediate, and the third is near the XDP, creating staged thermal relief that reduces burden on each individual substrate while maintaining a controlled overall distance.
Solution Approach 2:
Each glass substrate is positioned at a specific location with optimized local properties to handle thermal burden appropriately for that region of the optical path. The substrates are not uniformly distributed but strategically placed where thermal management is most needed, allowing compact overall design while providing localized thermal relief.
3Adaptability or versatility
If more glass substrates are disposed between liquid crystal panel and XDP to accommodate future thermal burden, then future thermal burden can be accommodated, but alignment accuracy of assembly to XDP degrades due to increased size and weight
Solution Approach 1:
The assembly is segmented into multiple glass substrates that can be independently positioned and aligned. This segmentation allows each substrate to be precisely located relative to the optical path and XDP, maintaining alignment accuracy even as the number of substrates increases to accommodate future thermal burden requirements.
Solution Approach 2:
The patent incorporates rotational adjustment capability for the glass substrates, allowing dynamic alignment of polarization axes during assembly or maintenance. This dynamic adjustment feature ensures that even with multiple substrates increasing assembly complexity, the final alignment accuracy can be optimized to meet precision requirements.
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 thermal stress on polarizers, extends their lifespan, minimizes the back focus of the projection optical system, and maintains alignment accuracy while reducing the size and weight of the apparatus.
Implementation Method 1
polarizer 103 absorbs a predetermined polarized light component included in the incident light in a predetermined proportion. Thus, a light beam in a predetermined polarization state (linearly polarized light) alone can be transmitted by polarizer 103.
Implementation Method 2
λ/2 plate 104, in turn, gives a phase difference to the linearly polarized light incident thereon to rotate the plane of polarization of the linearly polarized light by 90 degrees. For example, S-polarized light is converted to P-polarized light.
Data Source
AI summary
A projection display apparatus for combining image lights formed by two or more of different liquid crystal panels through a prism, and projecting the combined image light onto a projection plane through a projection optical system. The apparatus comprises a first optically transmissive substrate opposite an exit plane of the liquid crystal panel, a second optically transmissive substrate opposite an entrance plane of the prism, and at least one third optically transmissive substrate disposed between the first optically transmissive substrate and the second optically transmissive substrate, wherein the first optically transmissive substrate, second optically transmissive substrate, and third optically transmissive substrate are each provided with a polarizer for absorbing a predetermined polarized light component in a predetermined proportion, and the second optically transmissive substrate is adhered to the entrance plane of the prism.