Flexible Display Module Alignment Structure for Crack-Free Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing flexible display panels experience cracks due to uneven stress caused by a small alignment area and mismatched number of alignment marks between the display panel and the flexible circuit board, particularly at high temperature and pressure.
Innovation Solution
The display module and mobile terminal design includes a display panel with multiple first alignment marks and a flexible circuit board with corresponding second alignment marks, each composed of multiple marks, ensuring equal numbers and aligned support portions to increase alignment area and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a T-shaped alignment mark is used with only one mark in the binding region, then the alignment process is simple, but the alignment area is small and stress is uneven causing cracks
Solution Approach 1:
The alignment mark is segmented into multiple components: multiple first alignment marks on the display panel and multiple second alignment marks on the flexible circuit board. Each alignment mark includes an alignment portion and a support portion, dividing the alignment function across multiple elements rather than relying on a single T-shaped mark. This segmentation increases the alignment area and distributes stress evenly, preventing cracks while maintaining alignment accuracy.
2Ease of manufacture
If the number of alignment marks is unequal between display panel and flexible circuit board, then the alignment process is simplified, but stress distribution is uneven leading to cracks
Solution Approach 1:
The alignment marks are designed with differentiated local qualities: the display panel has multiple first alignment marks while the flexible circuit board has multiple second alignment marks, with corresponding numbers on both sides. Each alignment mark structure includes an alignment portion for positioning and a support portion for stress distribution. This local quality differentiation ensures equal numbers of alignment marks on both components, achieving uniform stress distribution and preventing cracks during bonding while maintaining manufacturing simplicity.
3Productivity
If alignment area is small, then the alignment process is faster, but stress is concentrated causing cracks under high temperature and pressure
Solution Approach 1:
The alignment mark design extends beyond a single point or small area by incorporating both alignment portions and support portions that span across the binding region. The multiple alignment marks are distributed across the display panel and flexible circuit board, effectively increasing the alignment area from a concentrated point to an extended regional distribution. This dimensional expansion of the alignment area distributes stress evenly across multiple points, preventing stress concentration and cracks under high temperature and pressure conditions while maintaining efficient alignment speed.
Data Source
AI summary
The present disclosure provides a display module and a mobile terminal. The display module includes a display panel and a flexible circuit board. The display panel includes a plurality of first binding terminals and a plurality of first alignment marks. The flexible circuit board includes a plurality of second binding terminals and a plurality of second alignment marks. The second binding terminals are bound to the first binding terminals, each of the first alignment marks corresponds to one of the second alignment marks, and each of a plurality of first marks of the first alignment marks corresponds to one of a plurality of second marks of the second alignment marks.