Mother Substrate Recess-Protrusion Structure Crack Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the manufacturing process of liquid crystal display (LCD) or organic light-emitting diode (OLED) display substrates, cracks often form during the division of mother substrates, leading to potential failure of the display substrates due to the propagation of lateral cutting cracks, which reduces yield.
Innovation Solution
A mother substrate with a recess-protrusion structure is introduced between the dividing line and the display element formation regions, featuring alternately arranged recesses and protrusions with identical extension directions to the dividing line, which effectively blocks the propagation of lateral cutting cracks by absorbing stress and preventing crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mother substrate is divided by gashing and applying impact force along the dividing line, then the mother substrate can be separated into multiple display substrates, but lateral cutting cracks propagate and cause display substrate failure
Solution Approach 1:
The dividing line region is segmented into multiple sections by forming alternating recesses and protrusions. This segmentation interrupts the continuous path for crack propagation while maintaining the overall dividing function, allowing the substrate to be separated into multiple display substrates without lateral cutting cracks spreading across the entire dividing line.
Solution Approach 2:
The recess-protrusion structure creates local variations in the dividing line region, where recesses provide stress relief zones and protrusions maintain structural integrity. This local quality modification prevents uniform crack propagation while preserving the division capability, thereby improving display substrate yield without sacrificing division efficiency.
2Reliability
If the recess-protrusion structure is formed with alternating recesses and protrusions, then lateral cutting crack propagation is blocked, but the structure complexity increases
Solution Approach 1:
The recess-protrusion structure is formed in advance during the substrate manufacturing process, before the division operation is performed. This preliminary action pre-establishes the crack-blocking features, so that when division occurs, the structure is already in place to prevent lateral cutting crack propagation, avoiding the need for complex real-time control during division.
Solution Approach 2:
The recess-protrusion structure modifies the physical parameters of the dividing line region by creating controlled variations in depth, width, and spacing. These parameter changes create stress distribution patterns that naturally block crack propagation while maintaining manufacturability through standard fabrication processes, balancing reliability improvement with acceptable structural complexity.
Data Source
AI summary
A mother substrate for display substrates, a manufacture method thereof, a display substrate and a display device are provided. The mother substrate for display substrates includes multiple display element formation regions and a dividing line surrounding each display element formation region. A recess-protrusion structure is provided between the dividing line and the display element formation region, the recess-protrusion structure includes multiple recesses and protrusions which are arranged alternately, and extension directions of the recess and the protrusion are identical to an extension direction of the dividing line.