Crack Detection Lines on Dam Structure for Display Encapsulation
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Solution Overview
Problem
Current display devices lack an effective method to detect cracks in the encapsulation layer, which can compromise their reliability and performance.
Innovation Solution
A display device design that includes a substrate with pixels, an encapsulation layer, a dam structure, and crack detection lines comprising output and input lines positioned on the substrate without overlapping the encapsulation film, allowing for the detection of cracks along the edges and surface of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crack detection lines are integrated into the display device, then reliability is improved, but device complexity increases
Solution Approach 1:
The crack detection lines are integrated with the existing pixel structure by positioning the input line on the organic encapsulation film and the output line on the dam structure, allowing the same structural elements to serve both display and crack detection functions. This merging approach enables crack detection capability to be added without requiring completely separate detection components, thus improving reliability while limiting the increase in device complexity.
Solution Approach 2:
The input line and output line are designed to serve dual purposes: they function as part of the pixel electrical connections while simultaneously acting as crack detection sensors. The input line on the organic encapsulation film and the output line on the dam structure can detect cracks in their respective locations, making the electrical connection lines universal elements that perform both signal transmission and crack detection functions.
2Measurement precision
If the output line is disposed on the dam structure without overlapping the organic encapsulation film, then crack detection precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The output line is positioned on the dam structure specifically at locations where crack detection is most critical, such as around the periphery of the organic encapsulation film. This localized placement allows high measurement precision for crack detection at key positions without requiring the entire output line to be manufactured with extremely high precision, thus improving crack detection precision while managing manufacturing precision requirements.
Solution Approach 2:
The dam structure serves as an intermediary platform that provides a stable base for positioning the output line. By placing the output line on the dam structure rather than directly on the substrate or encapsulation film, the dam structure acts as a mediator that facilitates precise positioning while accommodating manufacturing variations, thus improving measurement precision without excessively increasing manufacturing precision requirements.
Data Source
AI summary
A display device includes a substrate, a plurality of pixels disposed on the substrate, an encapsulation layer disposed above the plurality of pixels and comprising an organic encapsulation film, a dam structure disposed on the substrate and surrounding an outer boundary of the plurality of pixels, and crack detection lines comprising an output line disposed on the dam structure without overlapping with the organic encapsulation film, and an input line electrically connected to the output line and disposed on the organic encapsulation film.