Light-Transmissive Electrode Films for Flexible Electro-Optic Devices
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Solution Overview
Problem
Existing electro-optic devices face issues such as increased manufacturing costs, higher voltage and energy consumption, reduced operational temperature range, decreased switching speed, and poor electro-optic performance due to the presence of an adhesive layer between the front and back electrodes, as well as defects or voids in the electro-optic material layer.
Innovation Solution
The electro-optic device eliminates the need for an adhesive layer between the front and back electrodes, using a conductive film with a first adhesive layer and a first electrode layer that does not conform to the surface roughness of the electro-optic material layer, ensuring good electro-optic performance even with defects or voids, and allowing for flexible and light-transmissive designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an adhesive layer is used between front and back electrodes, then manufacturing is simplified, but electro-optic performance deteriorates due to increased voltage and energy consumption
Solution Approach 1:
The patent removes the adhesive layer from the device structure entirely. The conductive film is designed to directly contact the electro-optic material layer without requiring an adhesive layer between electrodes, thereby eliminating the harmful electrical insulation barrier while maintaining manufacturing simplicity through direct lamination processes
Solution Approach 2:
The conductive film serves as a dual-function intermediary element that simultaneously provides electrical conductivity and mechanical adhesion. By integrating adhesive properties into the conductive film itself rather than using a separate adhesive layer, the patent eliminates the electrical insulation problem while maintaining bonding capability
2Ease of manufacture
If an adhesive layer is present between electrodes, then assembly is facilitated, but switching speed decreases and operational temperature range is reduced
Solution Approach 1:
The adhesive layer is completely removed from the device structure. The conductive film directly contacts the electro-optic material layer, eliminating the insulation barrier that caused slow switching and limited temperature operation, while assembly is maintained through direct lamination or bonding processes
3Reliability
If a conductive film does not conform to surface roughness, then electro-optic performance is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The conductive film is designed with differentiated surface properties: the portion contacting the electro-optic material layer is made smooth and planar to ensure good optical contact and prevent voids, while the adhesive portion maintains bonding capability. This local differentiation allows non-conformal surfaces to achieve good electro-optic performance by ensuring the critical optical interface is smooth regardless of underlying surface roughness
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 configuration maintains optimal electro-optic performance, reduces manufacturing costs, and enhances flexibility while minimizing electrical shorts and defects, thus improving the overall efficiency and durability of the device.
Implementation Method 1
The conductive film may be light-transmissive
Implementation Method 2
a first adhesive layer and a first electrode layer
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
An electro-optic device, and its method of manufacturing, is disclosed comprises a first substrate layer, a conductive film comprising a first adhesive layer and a first electrode layer, an electro-optic material layer, and a second electrode layer. The first electrode layer, which is on contact with the electro-optic material layer, comprises a conductive material, such as conductive particles, a metallic material or a conductive polymer. The first adhesive layer has high storage modulus and does not exhibit plastic flow under the conditions of manufacturing, storage, and operation of the electro-optic device. The conductive film does not conform to the surface roughness of the first surface of the electro-optic material layer. The conductive film may be designed to be thin, flexible and transparent. The resulting electro-optic device exhibit excellent electro-optic performance even where the electro-optic material layer has imperfections in the form of gaps.