LCOS Adaptive Compensator for Temperature-Stable Color Performance
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Solution Overview
Problem
Conventional LCOS devices with fixed-angle compensators suffer from temperature-dependent optical performance issues, leading to degraded image quality due to the deviation of optimal optical angles from their preset values when ambient temperatures vary.
Innovation Solution
Incorporating a thermal sensor and a rotatable compensator with a processing device that adjusts the compensator's angle based on thermal signals to maintain optimal optical performance across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a factory-set fixed-angle compensator is used, then the device complexity is reduced, but the optical performance becomes temperature dependent and degrades at varying temperatures
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed-angle compensator with a rotatable compensator that can dynamically adjust its rotation angle in response to temperature changes. The compensator is driven by a motor (stepper or servo motor) that rotates the compensator to a predetermined angle corresponding to the detected temperature, thereby maintaining optimal optical performance across varying temperature conditions.
Solution Approach 2:
The patent implements feedback by using a temperature sensor to detect the ambient temperature and feed this information to a control unit. The control unit then determines the appropriate rotation angle for the compensator based on the detected temperature and actuates the motor to rotate the compensator to that angle, creating a closed-loop feedback system that maintains optimal optical performance.
2Manufacturing precision
If the compensator angle is optimized for green light source, then the green light contrast ratio is maximized, but the optimal performance for red and blue light sources is compromised
Solution Approach 1:
The patent applies parameter changes by adjusting the rotation angle parameter of the compensator based on temperature variations. Different rotation angles are predetermined for different temperature ranges to compensate for temperature-induced shifts in the optimal optical angles for R, G, and B light sources. This allows the system to maintain optimal contrast ratios for all three colors across a wide temperature range by changing the compensator's angular parameter in response to temperature changes.
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 adaptive compensator maintains consistent optical performance by dynamically adjusting its angle in response to temperature changes, ensuring high image quality across a wide range of ambient temperatures.
Implementation Method 1
The liquid crystal layer of the LCOS controls the polarization of light that passes through it
Implementation Method 2
the reduction of the birefringence of the liquid crystal material with elevated temperature within the LCOS module
Data Source
AI summary
A liquid crystal on silicon (LCOS) device includes a liquid crystal on silicon (LCOS) module with a thermal sensor disposed on a circuit board. A compensator with a rotatable device is disposed on top of the LCOS module, and a processing device is formed on the circuit board and responsive to color-specific response trend of thermal signals to control rotation angles of the compensator according to the thermal signals received from the thermal sensor.