Display Device Strain Gauge for Substrate Reliability
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Solution Overview
Problem
Display devices are prone to defects when subjected to impact due to strain in the surrounding areas, which can lead to reliability issues, as existing technologies lack effective strain measurement and prediction methods.
Innovation Solution
A display device design that includes a substrate with a display area and a non-display area featuring a fan-out part with conductive lines and strain gauges in the surrounding area, allowing for accurate measurement of strain and prediction of potential defects by detecting stress applied to the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are added to the surrounding area, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The strain gauge is disposed in the surrounding area before impact occurs, enabling preliminary monitoring of strain in the vulnerable region. This allows the system to detect potential defects before they manifest as actual failures, improving measurement precision while maintaining a relatively simple device architecture by using a single strategically placed gauge rather than multiple gauges throughout the structure.
2Reliability
If the fan-out part is designed to connect signal lines and pads, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The fan-out part is disposed in the surrounding area, utilizing the z-dimension (vertical space above the substrate) to route conductive lines. This three-dimensional arrangement allows signal lines to be connected to pads without requiring high manufacturing precision for planar alignment, as the connections can be established through vertical vias and overlying conductive layers rather than precise lateral positioning.
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
The accurate measurement of strain in the surrounding area helps predict and prevent defects, thereby enhancing the reliability of the display device.
Implementation Method 1
a strain gauge disposed on the substrate in the surrounding area
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area surround the display area, the non-display area including a pad area, a bending area disposed between the display area and the pad area, and a surrounding area disposed between the pad area and the bending area, a fan-out part disposed on the non-display area on the substrate and including a plurality of conductive lines that connects signal lines in the display area and pads in the pad area, and a strain gauge disposed on the substrate in the surrounding area.