Electro-optic Display Direct Coating Process

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Solution Overview

Problem

Existing processes for producing electro-optic displays require the use of front plane laminates, inverted front plane laminates, and double release films, which necessitate the presence of lamination adhesive layers between the electro-optic layer and the backplane, leading to issues such as reduced voltage availability, pixel blooming, and compromised resolution and temperature performance.

Innovation Solution

The development of a process that coats the electro-optic material directly onto the backplane without the need for pre-formed front plane laminates or lamination adhesive layers, utilizing a masked backplane process that allows for the formation of a sub-assembly with the electro-optic layer in direct contact with the backplane, thereby eliminating the issues associated with adhesive layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If lamination adhesive layers are used between the electro-optic layer and the backplane, then the manufacturing process is simplified and components are easily bonded, but voltage availability is reduced and pixel blooming occurs

Engineering Contradiction:

Improvebonding processVSAvoidvoltage availability

Core Design Contradiction:

Ease of manufactureVSPower

Solution Approach 1:

The patent removes the lamination adhesive layer from the display structure, eliminating the voltage-dropping component while maintaining component bonding through direct contact between the electro-optic layer and backplane, thereby resolving the contradiction between ease of manufacture and voltage availability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the electro-optic layer directly with the backplane by eliminating the adhesive layer, creating a direct electrical and physical connection that preserves voltage while simplifying the overall structure, thus resolving the contradiction between manufacturing ease and power efficiency

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If lamination adhesive layers are used between the electro-optic layer and the backplane, then the manufacturing process is simplified, but resolution is compromised

Engineering Contradiction:

Improvebonding processVSAvoiddisplay resolution

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent extracts and removes the lamination adhesive layer that causes pixel blooming and resolution loss, allowing the electro-optic layer to maintain sharp pixel definition while still being bonded to the backplane through direct contact

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies local quality by eliminating the adhesive layer specifically at the pixel interface where resolution is critical, while maintaining bonding functionality through direct contact, thus resolving the contradiction between manufacturing ease and manufacturing precision

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If lamination adhesive layers are used between the electro-optic layer and the backplane, then the manufacturing process is simplified, but temperature performance is compromised

Engineering Contradiction:

Improvebonding processVSAvoidtemperature performance

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent removes the lamination adhesive layer that acts as a thermal barrier between the electro-optic layer and backplane, enabling more efficient heat dissipation while maintaining structural bonding through direct contact

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent merges the electro-optic layer with the backplane by eliminating the adhesive layer, creating a direct thermal pathway that improves temperature performance while maintaining manufacturing simplicity

Inventive Principle:

Principle #5Merging (Combining)

4Ease of operation

If front plane laminates and double release films are used, then the display components are easily assembled, but the manufacturing process complexity increases

Engineering Contradiction:

Improveassembly processVSAvoidmanufacturing process

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent removes unnecessary lamination layers and release films from the assembly process, eliminating redundant steps while maintaining easy assembly through direct bonding of essential components

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent inverts the conventional approach by eliminating pre-formed laminates and using direct bonding instead, simplifying the manufacturing process while maintaining assembly ease

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP4137884B1Processes for producing electro-optic displays

Publication Date: 2025.05.28 E INK CORP

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Figure 2A~2D
Figure 3A~3D

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.