Flexible Dye Liquid Crystal Spacer Layout for Stable Cell Gaps
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Solution Overview
Problem
Existing flexible dye liquid crystal dimming devices suffer from issues such as poor spacer distribution uniformity, weak adhesion of spacers to alignment films, and white spots due to cell gap collapse, which are exacerbated by the use of high-temperature processes incompatible with flexible substrates.
Innovation Solution
A dimming module design featuring a first and second substrate with conductive layers and alignment films, spacers made of flexible materials, and a border sealing glue, with spacers arranged at specific distances and shapes to enhance support and adhesion, and a manufacturing process using lower-temperature methods to form spacers and alignment films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature processes are used to form spacers and alignment films, then manufacturing precision is improved, but the flexible substrate cannot withstand the temperature
Solution Approach 1:
The patent changes the temperature parameter from high-temperature conventional processes to low-temperature processes (below 150°C) that are compatible with flexible substrates. This is achieved by using alternative materials and methods such as photoalignment films that can be processed at low temperatures, and spacers made from materials like polyimide or polyethylene terephthalate that can be formed without high-temperature processing, thus resolving the contradiction between manufacturing precision and temperature tolerance.
Solution Approach 2:
The patent employs composite material structures combining flexible substrates with temperature-resistant spacer materials and low-temperature processable alignment films. The alignment film layer is designed to be processable at low temperatures while maintaining proper alignment properties, and spacers are made from materials that can be deposited or formed without exceeding the substrate's temperature tolerance, enabling precise manufacturing without damaging the flexible base.
2Stability of the object's composition
If spacers are made larger to improve support, then cell gap stability is improved, but spacing uniformity becomes harder to control
Solution Approach 1:
The patent divides the support function into multiple smaller spacers distributed across the substrate rather than using fewer larger spacers. This segmentation approach maintains cell gap stability through distributed support points while improving spacing uniformity control, as each small spacer can be precisely positioned and sized. The spacers are arranged in a regular pattern with controlled spacing between adjacent spacers, enabling both stability and uniformity.
Solution Approach 2:
The patent applies different spacer characteristics to different regions or uses varied spacer dimensions based on local requirements. The spacers are designed with specific size ranges (e.g., 1-10 μm in diameter) and spacing distances (e.g., 10-100 μm between adjacent spacers) that optimize both support stability and manufacturing precision. This local optimization allows the system to achieve uniform spacing while providing adequate support.
3Reliability
If spacer adhesion to alignment film is strengthened, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the material parameters of the alignment film and spacer interfaces to enhance adhesion. The alignment film is designed with surface properties that promote strong bonding to spacer materials, and the spacers are made from materials compatible with the alignment film substrate. This chemical and physical parameter optimization strengthens adhesion without requiring complex multi-step manufacturing processes, as the adhesion is achieved through material selection rather than complex processing.
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 design improves spacer adhesion and distribution, preventing cell gap collapse and white spots, ensuring robust support under external forces and maintaining consistent light-shielding or light-transmitting states.
Implementation Method 1
dye liquid crystals are in the dimming region
Data Source
AI summary
A dimming module is provided to include a first substrate, a second substrate, spacers, a border sealing glue and dye liquid crystals; the first substrate includes a first base, a first conductive layer and a first alignment film sequentially stacked on a side of the first base close to dye liquid crystals; the spacers are on a side of the first conductive layer close to the dye liquid crystals; the second substrate includes a second base, a second conductive layer and a second alignment film sequentially stacked on a side of the second base close to dye liquid crystals; the second substrate and the first substrate are aligned and assembled, the border sealing glue is therebetween and surrounds them to form a dimming region in which the dye liquid crystals are positioned and a spacing distance between every two adjacent spacers is from 50 μm to 1000 μm.