Flexible Wiring Board Layout for Higher Light Control Sheet Yield

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Solution Overview

Problem

The inefficient arrangement of flexible wiring boards on laminate sheets results in poor yield during the production of light control sheets, particularly as the size of the light control sheets increases, leading to a decrease in the ratio of used area for the flexible wiring boards.

Innovation Solution

A flexible wiring board unit comprising a first flexible wiring board, a second flexible wiring board, and a third flexible wiring board, where the third flexible wiring board is connected to both the first and second flexible wiring boards in a manner that reduces its size, allowing for improved arrangement efficiency by minimizing the width of the third flexible wiring board and optimizing the connection terminals and power supply terminals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the size of light control sheets increases, then the light control function is improved, but the ratio of used area for flexible wiring boards decreases

Engineering Contradiction:

Improvearea of light control sheetVSAvoidyield of flexible wiring board arrangement

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The flexible wiring board is divided into multiple separate wiring boards (first, second, third, and fourth flexible wiring boards) instead of using a single large wiring board. This segmentation allows each smaller wiring board to be arranged more efficiently on the laminate sheet, improving the overall yield while supporting larger light control sheets.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wiring boards are arranged in a distributed pattern across the laminate sheet rather than concentrating all connections in one area. The first and second flexible wiring boards connect to electrode terminals on one side, while the third and fourth connect on the opposite side, utilizing both dimensions of the sheet effectively.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Device complexity

If a single large flexible wiring board is used, then connection is simplified, but arrangement efficiency on laminate sheets deteriorates

Engineering Contradiction:

Improveconnection structureVSAvoidarrangement efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The single large flexible wiring board is segmented into multiple smaller wiring boards (first, second, third, and fourth flexible wiring boards). Each wiring board connects to specific electrode terminals, distributing the connection function across multiple components rather than one large board, thereby improving arrangement efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection function is extracted and distributed to multiple separate wiring boards rather than being concentrated in one board. Each wiring board is independently arranged on the laminate sheet, allowing for more efficient space utilization while maintaining all necessary electrical connections.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the third flexible wiring board is made larger to ensure proper connection, then connection reliability is improved, but the width increases reducing arrangement efficiency

Engineering Contradiction:

Improveconnection reliabilityVSAvoidwidth of third flexible wiring board

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The connection function is segmented across multiple wiring boards (third and fourth flexible wiring boards) positioned on opposite sides of the light control sheet. This allows the third wiring board to maintain a compact width while still achieving reliable connections through the distributed architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The connection reliability is achieved by combining the functions of multiple wiring boards (third and fourth flexible wiring boards) that work together to establish electrical connections. Their combined effect ensures reliable connectivity without requiring any single board to be excessively large.

Inventive Principle:

Principle #5Merging (Combining)

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 enhances the efficiency of arranging flexible wiring boards on laminate sheets, reducing the size of the third flexible wiring board and improving the overall yield by ensuring effective connection and application of voltage across the transparent conductive sheets, thereby changing the diffuse transmittance of the light control layer.

Implementation Method 1

Each electrode terminal is bonded to one of bonded terminals included in a flexible wiring board. As a voltage is applied across the two transparent conductive sheets through the flexible wiring board, the diffuse transmittance of the light control layer changes.

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20260040452A1Flexible wiring board unit and light control unit

Publication Date: 2026.02.05 TOPPAN HOLDINGS INC

AI summary

A flexible wiring board assembly that includes a first flexible wiring board extending in a first direction, a second flexible wiring board extending in the first direction, and a third flexible wiring board extending in a second direction and connected to the first flexible wiring board and the second flexible wiring board, the second direction intersecting the first direction.