Projection Display Polarizer Stress Reduction via Segmented Support
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Solution Overview
Problem
Conventional projection display devices face image quality deterioration due to stress-induced distortion of polarizers, which can lead to foreign substance invasion and uneven stress on internal components, affecting the quality of projected images.
Innovation Solution
A projection display device design incorporating a light source, first and second polarizers, a reflective liquid crystal panel, an illumination optical system, and a support member with a seal mechanism to prevent foreign substance invasion and reduce stress on polarizers, ensuring stable image projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the polarizer is fixed using adhesive in a sealed triangular prism, then foreign substance invasion is prevented, but stress acts on the polarizer causing distortion and image quality deterioration
Solution Approach 1:
The support structure is divided into a frame-shaped support member that provides multiple discrete support points rather than continuous adhesive bonding. This segmentation reduces stress concentration on the polarizer while maintaining structural integrity and sealing effectiveness.
Solution Approach 2:
The adhesive bonding method is extracted/removed from the support structure. Instead of using adhesive to fix the polarizer, the invention uses a frame-shaped support member that mechanically supports the polarizer at discrete points, eliminating the stress-induced distortion caused by adhesive while maintaining foreign substance prevention through the sealed prism structure.
2Stability of the object's composition
If adhesive is used to fix the polarizer, then the polarizer is secured in position, but uneven stress causes distortion and deformation
Solution Approach 1:
The continuous adhesive bond is segmented into discrete support points provided by the frame-shaped support member. This segmentation distributes the polarizer weight and external forces across multiple points, preventing uneven stress concentration that would cause distortion while maintaining positional stability through the geometric constraint of the frame structure.
Solution Approach 2:
The support function is localized to specific regions where the frame-shaped support member contacts the polarizer, rather than uniform adhesive coverage. This localized support at strategic points provides sufficient positional stability while avoiding stress distribution issues associated with continuous adhesive bonding.
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 prevents image quality deterioration by sealing the internal space and reducing stress on polarizers, maintaining image clarity and simplifying the device structure while ensuring efficient light modulation and projection.
Implementation Method 1
a first polarizer which is arranged in an optical path of the source light and passes the source light in a first polarization state
Implementation Method 2
a second polarizer which is arranged in an optical path of the source light between the first polarizer and the reflective liquid crystal panel, passes the source light in the first polarization state from the first polarizer, and reflects the source light in a second polarization state from the reflective liquid crystal panel
Data Source
AI summary
A projection display device includes: a light source device which emits source light; a first polarizer passes the source light in a first polarization state; a reflective liquid crystal panel; an illumination optical system which causes the source light to be incident to the reflective liquid crystal panel; a second polarizer passes the source light in the first polarization state from the first polarizer, and reflects the source light in a second polarization state from the reflective liquid crystal panel; a projection optical system which projects the source light reflected by the second polarizer; a support member which includes an outer member that supports the first polarizer and the reflective liquid crystal panel and an inner member that is fixed to the outer member in an internal space of the outer member and supports the second polarizer; and a seal mechanism which seals the internal space.