Display Panel Crack Sensing via Cover Layer Connection
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Solution Overview
Problem
In display panels with openings, issues such as cracks or film peeling can occur in components arranged around the opening, affecting the panel's reliability and performance.
Innovation Solution
A display panel design that includes a substrate with an opening region, a display region, and a middle region, featuring a plurality of display elements, an encapsulation layer, a planarization layer, a crack sensing portion, and a cover layer to address the issues of cracks and film peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If components are arranged around the opening region to add functions, then the functionality of the display apparatus is improved, but cracks or film peeling may occur in these components, worsening the reliability
Solution Approach 1:
A crack sensing portion is introduced as an intermediary element between the opening region and the display region. This crack sensing portion includes a crack sensing pattern that detects cracks before they propagate to critical components, serving as an early warning system that prevents reliability issues while maintaining functional components around the opening
Solution Approach 2:
The crack sensing portion is positioned and configured to detect cracks in advance before they can affect the functional components. By implementing this preliminary detection mechanism, the system can identify and address potential failures before they compromise the reliability of the arranged components
2Area of stationary object
If the display region area is expanded to increase display area, then the display capability is improved, but the structural integrity around openings may be compromised, worsening the stability
Solution Approach 1:
The crack sensing portion acts as a mediator structure between the expanded display region and the opening region. It provides a buffer zone that monitors structural stress and detects cracks early, allowing the display area to be expanded while maintaining structural integrity through continuous monitoring and early warning
3Reliability
If a crack sensing portion is added to detect cracks, then the reliability is improved, but the device complexity increases due to additional layers and electrical connections
Solution Approach 1:
The crack sensing portion is designed to serve multiple functions: it acts as both a structural layer within the display panel and a sensing element for crack detection. The crack sensing pattern can be integrated with existing conductive layers, allowing it to perform both electrical connection and crack sensing functions simultaneously, thereby reducing overall device complexity
4Measurement precision
If the crack sensing pattern is positioned adjacent to the opening region for early detection, then the crack detection precision is improved, but the risk of the sensing pattern itself being affected by cracks increases, worsening the reliability
Solution Approach 1:
The crack sensing pattern is designed with a ring shape that extends around the opening region rather than being positioned directly adjacent to it. This dimensional arrangement allows the sensing pattern to monitor cracks at a distance, detecting crack propagation trends before they reach critical thresholds, thus maintaining both detection precision and sensing pattern durability
Data Source
AI summary
A display panel including: a substrate having an opening region, a display region, and a middle region between the opening region and the display region; a plurality of display elements in the display region; an encapsulation layer covering the plurality of display elements and extending from the display region to the middle region; a planarization layer in the middle region and overlapping a portion of the encapsulation layer; a crack sensing portion on the planarization layer and extending around a portion of the opening region; and a cover layer covering a first end of the planarization layer that is on the encapsulation layer and electrically connected to the crack sensing portion.