Adjustable Optical Film Mechanism for Projector Polarization Stability
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Solution Overview
Problem
Projectors with liquid crystal on silicon (LCoS) and liquid crystal display (LCD) face issues with inconsistent polarization direction of light, leading to unstable brightness and contrast due to manufacturing tolerances, which current compensation films cannot adjust effectively.
Innovation Solution
An adjustable optical module with a rotatable optical film and adjusting lever, allowing the angle of the optical film to be adjusted and fixed, ensuring consistent polarization direction between the polarized beam splitter and liquid crystal on silicon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed compensation film is installed in the projector, then the relative position between the compensation film and the projector is fixed, but the polarization direction cannot be adjusted and manufacturing tolerances cause unstable contrast and brightness
Solution Approach 1:
The patent transforms the fixed compensation film into a rotatable optical component. The optical component can rotate within a positioning slot, allowing the polarization direction to be dynamically adjusted. After adjustment, the cover component with pressing portion fixes the optical component at the desired angle, combining adjustability with stability.
2Manufacturing precision
If the optical film angle is adjustable, then the polarization direction can be optimized, but the structure becomes more complex with additional adjusting mechanisms
Solution Approach 1:
The patent divides the optical component into a rotationally adjustable part and a fixed housing part. The optical component can be independently rotated within the positioning slot, allowing precise angle adjustment without complicating the overall housing structure. The cover component separately provides the fixing function.
Solution Approach 2:
The patent allows the optical component to be rotated to change its angular parameter relative to the housing. This enables optimization of the polarization direction by adjusting the angle parameter, while the positioning slot and cover component ensure the adjusted angle is maintained.
3Reliability
If manufacturing tolerances are reduced to ensure stable contrast and brightness, then the polarization direction consistency improves, but the manufacturing cost and difficulty increase
Solution Approach 1:
Instead of relying on tight manufacturing tolerances to ensure proper alignment, the patent provides a dynamic adjustment mechanism. The optical component can be rotated to compensate for manufacturing variations, allowing standard tolerance levels while achieving consistent contrast and brightness through user adjustment.
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 adjustable optical module enhances the optical performance by stabilizing the polarization direction of light, resulting in improved brightness and contrast for the projector's projection beam.
Implementation Method 1
a polarization direction of the light reflected by the liquid crystal on silicon cannot be completely consistent. Consequently, the reflected light is unstable
Data Source
AI summary
An adjustable optical module including a housing, an optical component and a cover component is provided. The housing has a positioning slot and an opening. The optical component is rotatably disposed on the positioning slot and includes an optical film and a carrying base for carrying the optical film. The carrying base includes an adjusting lever corresponding to the opening, and the adjusting lever is adapted to adjust an angle of the optical film. The cover component is fixed on the housing and covers the opening, and the cover component presses against the adjusting lever to fix the optical film. A projector having the adjustable optical module described above is also provided. The adjustable optical module and the projector of the invention can adjust the angle of the optical film through the above structures.