OLED Display Substrate Driving Wire Acute Angle Sealing Stress
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Solution Overview
Problem
The existing sealing methods for OLED devices, such as welding sealing glass, face issues with non-uniformity of the driving wire overlap, leading to stress and potential breakage of the sealing glass, resulting in sealing failure.
Innovation Solution
The display substrate design includes a driving wire with sides that form acute angles and vertical projections within the sealing region, increasing the contact area with the sealing glass and acting as buffer zones to alleviate stress, thereby enhancing the sealing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving wire passes across the sealing region with conventional configuration, then signal transmission is enabled, but the overlapping region becomes non-uniform causing stress and breaking the welding sealing glass
Solution Approach 1:
The driving wire is designed with different structural characteristics in different regions: in the sealing region, the sides form acute angles with the substrate to increase contact area and reduce stress, while in the displaying region, the sides are substantially perpendicular to the substrate for normal signal transmission. This local differentiation resolves the contradiction between sealing reliability and glass strength.
Solution Approach 2:
The acute angle configuration of the driving wire sides in the sealing region acts as a stress buffer zone before the sealing glass is welded. This pre-designed geometric feature distributes and reduces stress concentration, preventing the sealing glass from breaking under thermal or mechanical stress during and after the welding process.
2Ease of operation
If the driving wire has a certain height for signal transmission, then electrical function is achieved, but the overlapping region with sealing glass becomes non-uniform creating stress concentration
Solution Approach 1:
The driving wire is designed with asymmetric side angles: acute angles in the sealing region and perpendicular angles in the displaying region. This asymmetric configuration allows the wire to maintain its height for signal transmission while creating a more uniform overlapping region with the sealing glass, reducing stress concentration and improving manufacturing precision.
3Quantity of substance
If the sides of driving wire form perpendicular to substrate, then signal transmission path is clear, but contact area with sealing glass is reduced leading to stress concentration
Solution Approach 1:
The driving wire geometry is optimized locally: in the sealing region, sides form acute angles with the substrate to maximize contact area with sealing glass, while in the displaying region, sides are perpendicular for clear signal transmission. This localized geometric variation increases contact area without significantly complicating the overall device 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 configuration increases the sealing yield and prevents easy breakage of the welding sealing glass, ensuring a more reliable and durable seal for OLED devices.
Implementation Method 1
The sealing glass 13 may be welded or fused by laser radiation
Data Source
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AI summary
A display substrate and fabricating method, a display panel, and a display apparatus are provided. The display substrate includes a substrate (10) including a sealing region (12) and a driving wire (14) on the substrate (10). At least a portion of the driving wire (14) is in the sealing region (12). The portion of the driving wire (14) includes: a first surface, a second surface opposite to the first surface, and sides (141) there-between connecting to the first surface and the second surface. Each side (141) has a projection width on the substrate (10) of at least about 1 μm.