Electro-optic Display Masked Backplane Spray Coating
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Solution Overview
Problem
Existing methods for producing electro-optic displays require the use of front plane laminates, inverted front plane laminates, and double release films, which lead to issues such as voltage drop in the lamination adhesive layer, compromising display resolution and low-temperature performance, and are costly due to the need for lamination adhesives between electrodes.
Innovation Solution
A process involving a masked backplane technique where an electro-optic material is coated directly on a backplane without a pre-formed front plane laminate, eliminating the need for lamination adhesives and using spray coating to apply encapsulated electrophoretic media, allowing for direct contact between the electro-optic layer and the backplane, thereby maximizing resolution and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If front plane laminates and lamination adhesives are used to assemble electro-optic displays, then structural integrity and electrode attachment are achieved, but voltage drop occurs in the adhesive layer which compromises display resolution and low-temperature performance
Solution Approach 1:
The patent removes the lamination adhesive layer from the display structure by directly contacting the electro-optic material with the backplane electrode. This extraction eliminates the source of voltage drop while maintaining structural integrity through direct electrode-to-active-material contact, thereby resolving the contradiction between reliability and energy loss.
Solution Approach 2:
The patent introduces a conductive adhesive or conductive paste as an intermediary material between the backplane electrode and the electro-optic material. This mediator provides both mechanical bonding and electrical conductivity, eliminating the voltage drop issue that occurs with insulating lamination adhesives while maintaining structural integrity.
2Ease of manufacture
If conventional lamination processes with release films are used, then display components are assembled, but manufacturing costs increase due to the need for expensive lamination adhesives and complex multi-step processes
Solution Approach 1:
The patent eliminates release films and complex lamination adhesives from the manufacturing process by using a direct deposition or coating method to apply the electro-optic material onto the backplane. This extraction of unnecessary components simplifies the manufacturing process and reduces material costs.
Solution Approach 2:
The patent replaces the mechanical lamination process with heat and pressure with a direct deposition or coating process. This substitution eliminates the need for complex lamination equipment and release films, thereby reducing manufacturing costs and simplifying the production process.
3Manufacturing precision
If spray coating is used to apply encapsulated electrophoretic media, then direct contact between electro-optic layer and backplane is achieved maximizing resolution, but the process must handle non-planar substrates and three-dimensional objects
Solution Approach 1:
The patent employs a spray coating process that can dynamically adapt to various substrate geometries. The spray mechanism can adjust its trajectory, angle, and distance to accommodate non-planar substrates and three-dimensional objects while maintaining precise material deposition, thereby achieving both high resolution and substrate versatility.
Solution Approach 2:
The patent utilizes spray coating parameters such as spray angle, distance, velocity, and material viscosity to optimize deposition on different substrate geometries. By dynamically adjusting these parameters, the process achieves precise material placement (high resolution) while adapting to various substrate shapes and dimensions.
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
This approach enhances display resolution and low-temperature performance by eliminating the voltage drop through adhesives and reduces manufacturing costs by eliminating the need for lamination adhesives, while also enabling the use of spray coating to apply electrophoretic media on non-planar substrates and three-dimensional objects.
Implementation Method 1
using spray coating to apply encapsulated electrophoretic media
Implementation Method 2
encapsulated electrophoretic media
Data Source
AI summary
Improvements in the production of electro-optic displays include: (a) use of a masking film to keep a selected area of a backplane (such as a front electrode contact) free from electro-optic material; (b) spray coating of electrophoretic capsules on to a substrate under controlled conditions; (c) forming a monolayer of capsules on a substrate by prior deposition of a water-swellable polymer; and (d) overcoating a layer of electro-optic material with a solvent-free polymerizable liquid material, contacting this layer with a light-transmissive electrode layer, and polymerizing the liquid material to adhere the electrode layer to the electro-optic material.