Separate ACF Units for Liquid Crystal Panel Bonding
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Solution Overview
Problem
The existing electronic bonding structures in liquid crystal displays using anisotropic conductive films (ACFs) face issues with weak bonding in spacing regions due to uneven pressure distribution during the hot pressing process and accidental stripping of ACFs, leading to increased costs due to excessive use of expensive ACF material.
Innovation Solution
The implementation of separately distributed ACF units only on connecting regions of the substrate, reducing the required ACF area and ensuring firm bonding during the low-temperature process, thereby minimizing the risk of ACF stripping and optimizing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous ACF is used to cover both connecting regions and spacing regions, then the bonding coverage is complete, but the ACF material cost increases and bonding integrity decreases in spacing regions
Solution Approach 1:
The patent divides the continuous ACF into separate ACF units that are selectively placed only in connecting regions where drive ICs are mounted. This segmentation eliminates ACF material from spacing regions, reducing material cost while maintaining bonding integrity where needed. The separate ACF units are independently bonded to the substrate, ensuring reliable electrical connections without wasting material in non-functional areas.
Solution Approach 2:
The patent applies ACF material locally only in connecting regions rather than uniformly across the entire bonding area. This local quality approach ensures that ACF is present only where electrical connection is needed (under drive ICs), optimizing both material usage and bonding reliability. The spacing regions without ACF units reduce material cost while the connecting regions maintain full bonding integrity.
2Strength
If pressure is applied during hot pressing, then bonding strength increases in connecting regions, but pressure distribution becomes uneven causing weak bonding in spacing regions
Solution Approach 1:
By segmenting the ACF into separate units positioned only in connecting regions, the patent eliminates the pressure distribution problem entirely. Each ACF unit is independently bonded under its respective drive IC, receiving focused pressure during hot pressing. This segmentation ensures uniform pressure application on each ACF unit without the uneven distribution that occurs when trying to press a continuous ACF across both connecting and spacing regions.
3Ease of manufacture
If isolation film is removed from ACF, then electronic components can be attached, but ACF portions may be accidentally stripped off reducing bonding reliability
Solution Approach 1:
The segmented ACF units are individually bonded to the substrate in separate connecting regions, creating isolated bonding zones. When the isolation film is removed from each ACF unit, the bonding is already established and localized, preventing accidental stripping. The segmentation creates independent bonding regions where each ACF unit's adhesion to the substrate is reinforced by the localized bonding process and surrounding structure.
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 approach reduces the amount of ACF material needed, enhances bonding integrity, and decreases the overall cost of liquid crystal panels by ensuring effective electrical connections while maintaining strong bonding between ACF units and the substrate.
Implementation Method 1
The ACF units are separately disposed on the bonding region of the first substrate, and are configured for bonding the drive ICs onto the first substrate. The ACF generally includes a polymer resin film having a plurality of conductive particles distributed therein.
Data Source
AI summary
An exemplary liquid crystal panel (100) includes a first substrate (110), a second substrate (120) opposite to the first substrate, a liquid crystal layer (130) sandwiched between the first and second substrates, a plurality of drive integrated circuits (ICs) (114), and a plurality of anisotropic conductive film (ACF) units (115). The first substrate includes a source bonding region (117) and a gate bonding region (118) at the periphery thereof. Each of the source bonding region and the gate bonding region includes a plurality of connecting regions and a plurality of spacing regions each between two connecting regions. The ACF units are disposed on the connecting regions of the source bonding region and the gate bonding region, and are configured for bonding the drive ICs onto the first substrate.