Electrophoretic Display Sealant Curing via Optical Adhesive

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Solution Overview

Problem

Conventional electrophoretic display devices face issues with incomplete curing of UV sealants due to the anti-UV layer's interference during the curing process, leading to inadequate sealing and reduced device lifespan.

Innovation Solution

Incorporating optical adhesives with anti-UV properties that absorb specific wavelengths of light, allowing the sealant to cure completely while protecting the electrophoretic display components from UV exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If an anti-UV layer is installed to protect electrophoretic display particles from UV light, then the display device can operate normally in nature environment, but the sealant cannot cure completely due to UV light absorption by the anti-UV layer

Engineering Contradiction:

ImproveUV light protection for electrophoretic display particlesVSAvoidsealant curing completeness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent introduces an intermediary structure (opening or transparent window) in the anti-UV layer that allows UV light to pass through to the sealant while maintaining UV protection for the electrophoretic display particles. This mediator resolves the conflict by selectively transmitting UV light only where needed for sealant curing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The anti-UV layer is segmented by creating openings or transparent windows within it. This segmentation allows different regions of the anti-UV layer to have different functions: most areas block UV light to protect particles, while specific segmented regions allow UV transmission for sealant curing.

Inventive Principle:

Principle #1Segmentation

2Reliability

If a UV curing sealant is used to seal the device, then complete sealing can be achieved, but the anti-UV layer interferes with the curing process resulting in incomplete curing

Engineering Contradiction:

Improvesealing completenessVSAvoidsealant curing process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The opening or transparent window in the anti-UV layer acts as an intermediary that facilitates UV light transmission to the sealant. This mediator enables the curing process to proceed completely while the anti-UV layer remains in place to protect the display particles.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent designs the anti-UV layer with pre-formed openings or transparent windows before the sealing process. This preliminary action ensures that UV light pathways are already established, allowing the sealant to cure completely without interference during the curing process.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If the sealant is completely covered by anti-UV layer, then UV protection is maximized, but the sealant cannot be exposed to UV light for curing

Engineering Contradiction:

ImproveUV light absorptionVSAvoidUV light exposure for sealant curing

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The anti-UV layer is segmented into covered regions and uncovered regions (openings or transparent windows). The covered regions maximize UV absorption for particle protection, while the uncovered regions allow UV light transmission for sealant curing energy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the anti-UV layer have different UV transmission properties. Most areas have high UV absorption quality for particle protection, while specific local regions have high UV transmission quality to enable sealant curing.

Inventive Principle:

Principle #3Local quality

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

Ensures complete curing of the sealant and enhances the sealing process, thereby extending the device's lifespan and reducing defective rates.

Implementation Method 1

at least one of the first optical adhesive and the second optical adhesive is capable of absorbing the light of predetermined wavelength

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

the sealant cures upon exposure to light predetermined wavelength

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS8279515B2Electrophoretic display

Publication Date: 2012.10.02 AU OPTRONICS CORP

AI summary

An electrophoretic display device includes a substrate, an electrophoretic component layer, a first optical adhesive, a barrier layer, a second optical adhesive, a protective layer, and a sealant. The first optical adhesive and the second optical adhesive contribute in helping to provide light exposure to the sealant. One of the first optical adhesive and the second optical adhesive is capable of absorbing the light of predetermined wavelength and is adapted to expose the sealant.