LCOS Backplane Reflection Attenuation Layers for Blooming Control
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Solution Overview
Problem
Blooming in LCOS display devices reduces image quality due to high reflectivity causing overexposure and loss of detail.
Innovation Solution
Incorporation of one or more reflection attenuation layers, such as SiON, Al2O3, or MgO/TiN films, around and below the mirror metal in the LCOS display device to reduce light leakage and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high reflectivity mirror metal is used in LCOS display device, then light reflection efficiency is improved, but blooming effect occurs causing overexposure and loss of image detail
Solution Approach 1:
A reflection attenuation layer is introduced as an intermediary component between the high-reflectivity mirror metal and the incident light. This layer has controlled optical properties that allow it to selectively attenuate reflected light in certain regions, preventing blooming while preserving necessary reflection for normal operation. The intermediary layer mediates between the conflicting requirements of high reflection efficiency and blooming prevention.
Solution Approach 2:
The reflection attenuation layer is applied selectively to specific regions where blooming occurs, rather than uniformly across the entire mirror surface. This local application allows different regions of the mirror to have different effective reflectivity - high reflection in areas needing brightness, and attenuated reflection in areas prone to blooming - thus resolving the contradiction locally where needed.
2Manufacturing precision
If reflection attenuation layers are added to reduce blooming, then image clarity is improved, but device complexity increases
Solution Approach 1:
The reflection attenuation layer's optical properties are controlled by adjusting deposition parameters such as thickness, material composition, and deposition conditions. By changing these parameters, the layer's reflectivity can be precisely tuned to achieve the desired blooming attenuation while maintaining compatibility with existing manufacturing processes, thus improving image clarity without proportionally increasing device complexity.
Solution Approach 2:
The reflection attenuation layer is formed using composite material systems that combine multiple materials or phases to achieve optimal optical properties. This allows fine-tuning of the attenuation characteristics while using established materials and deposition techniques, balancing the improvement in image clarity with minimal increase in manufacturing complexity.
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
Improves image clarity by minimizing blooming effects through enhanced light absorption and anti-reflection properties.
Implementation Method 1
enhanced light absorption and anti-reflection properties
Implementation Method 2
anti-reflection properties
Data Source
AI summary
A device is provided. The device includes: a liquid crystal layer; an electrode layer on a first side of the liquid crystal layer; and a backplane attached to a second side of the liquid crystal layer opposite the first side. The backplane includes: a conductive structure operable to form a voltage difference with the electrode layer; a reflective structure between the conductive structure and the liquid crystal layer; a first reflection attenuation layer on first sidewalls of the conductive structure and a first upper surface of the conductive structure; and a second reflection attenuation layer on second sidewalls of the reflective structure, the second reflection attenuation layer defining an opening therein, a second upper surface of the reflective structure being exposed by the opening.