Touch Panel Bonding via Electric Loop for Shielded Inspection

Solution Overview

Problem

Current bonding structures between touch panels and flexible circuit boards make it difficult to accurately assess the bonding state between transmission wires and connection wires due to the shielding effect of the black matrix layer, hindering clear visual inspection.

Innovation Solution

A bonding structure that includes a touch panel with transmission wires on a shielding layer, a flexible circuit board with insulated connection portions, and a conductive adhesive film that forms an electric loop between the transmission wires and connection wires, allowing for an electrical confirmation of effective bonding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a black matrix layer is used for shielding at the peripheral region of the touch panel, then the shielding effect is improved, but the visual inspection capability of the bonding state deteriorates

Engineering Contradiction:

Improveshielding effectVSAvoidvisual inspection capability

Core Design Contradiction:

Object-affected harmful factorsVSDifficulty of detecting and measuring

Solution Approach 1:

The patent introduces an electric loop as an intermediary mechanism to indirectly detect the bonding state. Instead of directly observing the bonding area through visual inspection, the system uses electrical continuity testing through the conductive adhesive film to determine whether transmission wires are properly bonded to connection wires, thus solving the problem of obscured visual inspection caused by the black matrix layer

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/visual inspection method with an electrical detection method. By substituting direct visual observation with electrical continuity testing, the system can accurately assess bonding quality without being hindered by the opaque black matrix layer, effectively transitioning from optical detection to electrical detection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Device complexity

If visual inspection is used to check the bonding state, then the inspection method is simple, but the inspection accuracy deteriorates due to the black matrix layer shielding

Engineering Contradiction:

Improveinspection method simplicityVSAvoidbonding state detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces an electric loop as an intermediary mechanism to indirectly detect the bonding state. Instead of directly observing the bonding area through visual inspection, the system uses electrical continuity testing through the conductive adhesive film to determine whether transmission wires are properly bonded to connection wires, thus solving the problem of obscured visual inspection caused by the black matrix layer

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/visual inspection method with an electrical detection method. By substituting direct visual observation with electrical continuity testing, the system can accurately assess bonding quality without being hindered by the opaque black matrix layer, effectively transitioning from optical detection to electrical detection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 clear and accurate confirmation of effective bonding between the touch panel and flexible circuit board through the formation of an electric loop, improving the assembly process by providing a more reliable method than visual inspection.

Implementation Method 1

The first connection portions and the second connection portions of the connection wires are electrically connected to the transmission wires via the conductive adhesive film so as to form an electric loop

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS9532456B2Bonding structure of touch panel and flexible circuit board

Publication Date: 2016.12.27 HANNSTAR DISPLAY CORP

AI summary

A bonding structure of a touch panel and a flexible circuit board includes a touch panel, a flexible circuit board and a conductive adhesive film. The touch panel includes a shielding layer and multiple transmission wires disposed on the shielding layer. The flexible circuit board is under the touch panel and includes a substrate and multiple connection wires on the substrate. Each the connection wire includes a first connection portion and a second connection portion, and the two connection portions are separated from each other by an interval and electrically insulated from each other. The conductive adhesive film is between the transmission wires of the touch panel and the connection wires of the flexible circuit board, in which the first connection portions and the second connection portions of the connection wires are electrically connected to the transmission wires via the conductive adhesive film so as to form an electric loop.