Display Substrate Fanout Layout for Electrostatic Discharge Protection
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Solution Overview
Problem
The manufacturing process of display products is prone to Electro Static Discharge (ESD), which can cause high currents, damaging components and reducing product yield, as existing technologies lack effective electrostatic protection in strong electric or magnetic environments.
Innovation Solution
A display substrate with a bonding region that includes a fanout region with electrostatic protection structures, comprising symmetrically disposed electrostatic protection lines, which act as conductors to divert and eliminate electrostatic charges, thereby protecting components and improving yield without requiring additional mask processes or film thickness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic protection structures are added to protect against ESD, then reliability is improved, but device complexity increases
Solution Approach 1:
The electrostatic protection structure is segmented into multiple protection lines (first electrostatic protection line, second electrostatic protection line, third electrostatic protection line, fourth electrostatic protection line) that are distributed across different regions (first region, second region, third region, fourth region) of the substrate. Each segment independently provides ESD protection to specific areas, allowing the protection function to be divided into manageable parts that reduce overall structural complexity while maintaining reliability.
Solution Approach 2:
The electrostatic protection lines extend in the second direction (horizontal direction) perpendicular to the arrangement direction of sub-pixels (first direction/vertical direction). This dimensional change allows the protection structures to span across multiple pixel rows and columns, providing comprehensive ESD protection coverage without increasing vertical complexity in the pixel stacking direction.
2Reliability
If electrostatic protection lines are added to the fanout region, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
While the overall design employs symmetry, the individual electrostatic protection lines are positioned asymmetrically relative to each other to create complementary protection zones. For example, the first and second protection lines are positioned to protect different areas, and their asymmetric placement relative to the pixel array allows comprehensive coverage while maintaining manufacturability through standard photolithography alignment.
Solution Approach 2:
The electrostatic protection lines are designed to create equipotential regions across the substrate by extending continuously across multiple pixel rows and columns. This equipotential design ensures that electrostatic charges are distributed and dissipated uniformly, reducing the precision requirements for individual line positioning while maintaining overall protection effectiveness.
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
The electrostatic protection structure effectively prevents ESD damage to components and signal lines, enhancing product yield by conducting electrostatic charges away from sensitive areas, thus optimizing ESD resistance and reducing electrostatic control requirements.
Implementation Method 1
the electrostatic protection structure includes at least one pair of electrostatic protection lines, and the pair of electrostatic protection lines includes two electrostatic protection lines disposed symmetrically about a center line extending in a first direction
Data Source
AI summary
Disclosed are a display substrate, a display substrate motherboard and a display apparatus. The display substrate includes a display region and a bonding region located on a side of the display region, wherein the bonding region includes a fanout region, the fanout region includes a first anti-static area and a first wiring area located around the first anti-static area, the first wiring area includes a plurality of fanout wires, the first anti-static area includes at least one electrostatic protection structure disposed between the plurality of fanout wires, and the electrostatic protection structure includes at least one pair of electrostatic protection lines, and the pair of electrostatic protection lines includes two electrostatic protection lines disposed symmetrically about a center line extending in a first direction.