Flexible Base Member Wire Routing for Electro-Optical Device Warping

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Solution Overview

Problem

Existing electro-optical devices face reliability issues due to warping stress causing disconnection of wires near electronic components, leading to poor electrical connectivity and potential unintended warping stress during inspection processes.

Innovation Solution

The implementation of a flexible base member with conductive terminals and wires, where hole portions are formed only under terminals to allow second wires to maintain connection through connection members on the opposite surface, ensuring electrical reliability and reducing unnecessary space requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the flexible base member is warped to facilitate bending and reduce size, then the flexibility and compactness are improved, but the wires disposed on the flexible base member are warped and disconnected in the vicinity of electronic components, deteriorating electrical reliability

Engineering Contradiction:

ImproveflexibilityVSAvoidelectrical reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent transitions from planar wire routing to three-dimensional routing by passing wires through holes formed in the flexible base member. This allows wires to maintain their position and connection reliability while the base member warps, as the wires are routed through the thickness of the member rather than solely on its surface.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Connection members (such as conductive adhesives or metal plugs) are introduced as intermediaries to secure the wires to the inner walls of the holes in the flexible base member. This intermediary structure prevents wire disconnection during warping by anchoring the wires firmly within the hole portions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If holes are formed in the flexible base member to route wires through the thickness, then wire connection reliability is improved during warping, but the manufacturing complexity and processing steps increase

Engineering Contradiction:

Improvewire connection reliabilityVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The formation of holes, placement of connection members, and routing of wires are integrated into a unified manufacturing process. The holes are formed at locations that coincide with electronic component positions, and the connection members are placed during the same assembly process, reducing the need for separate processing steps.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Holes are formed only at specific locations where electronic components are mounted, rather than uniformly across the entire flexible base member. This localized approach reduces the number of holes and simplifies manufacturing while still providing adequate wire routing paths where needed.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the flexible base member is made thinner to facilitate warping, then the flexibility is improved, but the wires become more susceptible to disconnection and tension during warping

Engineering Contradiction:

ImproveflexibilityVSAvoidwire strength

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The wires are nested within the holes formed in the flexible base member, with connection members securing them to the inner walls. This nested configuration protects the wires from external tension and disconnection forces, allowing the base member to be made thinner while maintaining wire integrity during warping.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS7432451B2Electro-optical device, circuit board, mounting structure, and electronic apparatus

Publication Date: 2008.10.07 138 EAST LCD ADVANCEMENTS LTD

AI summary

An electro-optical device including an electro-optical panel, a flexible base member connected to the electro-optical panel, and an electronic component mounted on the flexible base member. The electronic component having conductive terminals electrically connected to a plurality of terminals disposed on the flexible base member, the plurality of terminals are disposed on one surface of the flexible base member, and the conductive terminals and the plurality of terminals two-dimensionally overlap each other. The flexible base member has first wires which are connected to the plurality of terminals and disposed on the one surface, hole portions formed in the flexible base member to correspond to at least one terminal, and second wires connected to the at least one terminal through connection members disposed in the hole portions and disposed on the other surface of the flexible base member opposite to the one surface.