CLC-Polymer Electro-Optic Modulator for Fine-Pitch Display Defect Detection
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Solution Overview
Problem
Existing display testing technologies face challenges in detecting defects in fine-pitch flat-panel displays due to surface quality issues with dielectric mirror films and inadequate transmission of electric fields, which limits their ability to accurately identify defects in high-resolution displays.
Innovation Solution
An electro-optic modulator using a cholesteric liquid crystal (CLC) polymer reflection film with a composite material layer and a transparent electrode layer is employed, allowing for improved surface quality and effective transmission of electric fields, enabling the detection of pixel defects in displays with fine pitches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dielectric mirror film is used in the electro-optic modulator, then the surface quality is degraded, but the structure is simpler
Solution Approach 1:
The patent employs a composite material consisting of cholesteric liquid crystal (CLC) and polymer materials to form the reflection film. This composite structure combines the optical reflection properties of CLC with the structural stability of polymer, achieving both high surface quality and effective electric field transmission that single-material dielectric mirrors cannot provide.
Solution Approach 2:
The patent changes the material parameters by transitioning from conventional dielectric mirror materials to a CLC-polymer composite system. This parameter change enables simultaneous optimization of surface quality, electric field transmission, and reflection performance, resolving the contradiction between manufacturing precision and device complexity.
2Reliability
If a dielectric mirror film is used, then the electric field transmission is inadequate, but the reflectivity is sufficient
Solution Approach 1:
The CLC-polymer composite material provides both adequate reflectivity and sufficient electric field transmission. The polymer component ensures structural integrity and electric field penetration, while the CLC component provides the necessary optical reflection, thereby improving detection accuracy without sacrificing reliability.
Solution Approach 2:
The polymer material acts as an intermediary that facilitates electric field transmission while the CLC material handles the reflection function. This separation of functions within the composite structure allows each material to optimize its specific role, improving overall system performance.
3Manufacturing precision
If the pitch of display pixels is reduced to 30 μm or less, then the resolution is improved, but the defect detection becomes more difficult
Solution Approach 1:
The patent replaces conventional contact-based or simple optical inspection methods with an electro-optic modulation system. By using the CLC-polymer composite's response to electric fields, the system can non-contactly detect defects in fine-pitch displays with high precision, overcoming the limitations of traditional detection methods.
Solution Approach 2:
The electro-optic modulator utilizes optical property changes (analogous to color changes) in response to electric field variations caused by pixel defects. This enables visual detection of defects in high-resolution displays by monitoring changes in light reflection characteristics.
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 CLC-polymer-based electro-optic modulator enhances the detection of pixel defects in high-resolution displays by providing better surface quality and efficient electric field transmission, allowing for precise detection of defects in displays with pitches of 30 μm or less.
Implementation Method 1
a cholesteric liquid crystal (CLC) polymer reflection film
Implementation Method 2
A cholesteric liquid crystal (CLC) polymer reflection film can be on a lower surface of the polymer film opposite the transparent electrode layer
Implementation Method 3
an electro-optic modulator that includes a polymer film including liquid crystal (LC) droplets in the polymer film
Implementation Method 4
liquid crystal (LC) droplets distributed in the polymer film
Implementation Method 5
A beam splitter can be configured to transmit or reflect light
Data Source
AI summary
An electro-optic modulator can include a polymer film including liquid crystal (LC) droplets in the polymer film and a transparent electrode layer on an upper surface of the polymer film. A cholesteric liquid crystal (CLC) polymer reflection film can be on a lower surface of the polymer film opposite the transparent electrode layer.