Branched LCD Wiring for ESD Charge Distribution
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) are prone to damage from electrostatic discharge (ESD) due to the concentration of electric charges at joint portions of metal conducting wires, leading to potential burning out of circuits and poor reliability.
Innovation Solution
The implementation of wires with multiple branches (two or three) that connect integrated circuit and flexible printed circuit bonding regions, distributing electric charges across multiple joint portions to reduce the risk of charge concentration and circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single metal conducting wire is used to connect IC bonding region and FPC bonding region, then the wiring structure is simple, but electric charges concentrate at the joint portion causing reliability to deteriorate
Solution Approach 1:
The single wire is segmented into multiple parallel wires, each with its own joint portion. This segmentation distributes the electric charge across multiple paths, preventing concentration at a single joint portion and thereby improving reliability against ESD damage while maintaining reasonable structural complexity
Solution Approach 2:
Multiple joint portions act as intermediaries that distribute and dissipate electric charges. Instead of having one critical joint portion that concentrates all charges, the system introduces multiple intermediate connection points that share the charge burden, reducing the stress on any single point
2Reliability
If wire width is increased to reduce resistance, then electrical conductivity improves, but the wire becomes more susceptible to ESD damage due to larger charge concentration area
Solution Approach 1:
The electrical connection is segmented into multiple parallel wires instead of one wide wire. This maintains good electrical conductivity through parallel paths while reducing the charge concentration area at each individual joint portion, as each joint serves a smaller portion of the total current
Solution Approach 2:
Each wire maintains appropriate local conductivity for its designated current load, while the distributed architecture ensures that no single location bears excessive charge concentration risk. The system achieves both good conductivity and ESD resistance through localized optimization across multiple elements
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 effectively disperses electric charges generated by ESD, protecting the joint portions and integrated circuit bonding regions from burning out, thereby enhancing the reliability of the liquid crystal display.
Implementation Method 1
When electrostatic discharge (ESD) occurs in the liquid crystal display, electric charges are liable to transfer between the FPC bonding regions 12 and corresponding driving IC bonding regions 11 via the wires 13
Data Source
AI summary
An exemplary liquid crystal display (50) includes plural integrated circuit bonding regions (51), plural flexible printed circuit bonding regions (52), and plural wires (53). Each of the wires includes a first branch (535) connecting to a corresponding one of the integrated circuit bonding regions, and two second branches (538). Each of the second branches connects between the first branch and a corresponding one of the flexible printed circuit bonding regions. The liquid crystal display can provide high reliability.