Liquid Crystal Cell Electrode Connections via Subtractive Ablation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing methods for connecting electrodes in adaptive lenses result in inaccurate positioning and discontinuous electrical connections, leading to defective integration and stacking issues.

Innovation Solution

A subtractive method involving the formation of electrode materials followed by ablation to create precise electrodes, eliminating the need for precise dispensing of electrically-conductive adhesive material, and allowing for continuous electrical connectivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If electrically-conductive adhesive material is dispensed in the form of a dot on a given electrode, then the material can be applied, but it is difficult to precisely position connection areas only where the given electrode is present

Engineering Contradiction:

Improvepositioning precision of connection areasVSAvoiddifficulty of precise positioning

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

Instead of attempting to precisely place conductive adhesive material only on electrode areas (additive approach), the patent applies conductive adhesive material across the entire electrode area and then removes portions that should not be conductive (subtractive approach). This inversion of the process sequence makes positioning much easier while achieving the same functional result.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts or removes portions of the conductive adhesive material after initial application to create the final precise pattern. By applying material first and then selectively removing it, the method achieves high positioning precision without the difficulty of direct precise placement.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If electrically-conductive adhesive material is dispensed in the form of a line on a given electrode, then connection can be provided, but there may be discontinuity in such a line, thereby leading to a discontinuous electrical connection

Engineering Contradiction:

Improvecontinuity of electrical connectionVSAvoidrisk of discontinuity in line form

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Rather than attempting to create continuous lines of conductive material (which risk discontinuities), the patent applies conductive adhesive material in a continuous layer across the electrode and then selectively removes portions. This ensures continuity is maintained during application, and only non-conductive areas are removed afterward.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent performs the preliminary action of applying conductive adhesive material across the entire electrode area before any removal steps. This preliminary continuous application guarantees material continuity, and subsequent removal only affects areas where conductivity should be eliminated.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If multiple adaptive lenses are stacked together to work with non-polarised light and/or reach high optical power, then optical performance is improved, but integration becomes defective due to imprecise electrical connections

Engineering Contradiction:

Improveoptical power and light handling capabilityVSAvoidquality of integration

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies the subtractive method to the electrical connection process in stacked adaptive lens assemblies. By applying conductive adhesive material first and then selectively removing it, precise and reliable electrical connections are achieved between multiple stacked lenses, enabling high optical power applications with proper integration.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Enables efficient, reliable, and precise electrical connections between electrodes, facilitating the assembly of optical devices with improved structural integrity and reduced manufacturing steps.

Implementation Method 1

ablating the disposed electrically-conductive adhesive material from at least one portion of the first region, whilst ablating the formed first layer of the first electrode material to create a first electrode

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Data Source

PatentEP4471493B1Subtractive method for providing connections to electrodes in liquid crystal cells

Publication Date: 2025.12.17 PIXIERAY OY

Figure 1~2
Figure 3A~3B
Figure 3C

AI summary

Disclosed is a method for manufacturing optical device (300, 400), method comprising forming first layer (304) of first electrode material on surface (306) of first substrate (308, 402) of optical device; disposing electrically-conductive adhesive material (ECA) (310, 410) on region(s) of first layer corresponding to first region (312, 414) of surface of first substrate; ablating disposed ECA material from portion(s) of first region, whilst ablating formed first layer of first electrode material to create first electrode (302, 404); forming second layer (316) of second electrode material on surface (318) of second substrate (320, 406) of optical device; ablating formed second layer of second electrode material to create second electrode (314, 408); and forming third layer of active material(s) (412) between first substrate and second substrate.