Display Crack Detection Electrodes Across Multiple Conductive Layers
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Solution Overview
Problem
Display apparatuses are prone to cracks when moved or handled, leading to moisture and oxygen ingress, which can oxidize organic light-emitting diodes and reduce their reliability.
Innovation Solution
A display apparatus with an enhanced crack detection system, featuring multiple conductive layers and crack detection electrodes extending along the edges of the substrate, connected to voltage lines and switches, allowing for simultaneous control and resistance measurement to detect cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple conductive layers with crack detection electrodes are added to increase detection range, then crack detection capability is improved, but device complexity increases
Solution Approach 1:
The crack detection system is divided into multiple conductive layers (first conductive layer with first crack detection electrode, second conductive layer with second crack detection electrode, third conductive layer with third crack detection electrode) positioned at different depths within the display apparatus. Each layer independently detects cracks in its specific region, enabling comprehensive coverage of the entire device while maintaining manageable complexity through modular segmentation of the detection function.
Solution Approach 2:
The crack detection capability is extended from a single-plane detection to three-dimensional detection by distributing crack detection electrodes across multiple conductive layers at different depths (z-dimension) within the display structure. This multi-layer arrangement transforms the detection system from two-dimensional to three-dimensional, enabling comprehensive crack detection throughout the entire volume of the display apparatus.
2Area of stationary object
If crack detection electrodes are extended along the edges of the substrate to cover wider area, then detection range is improved, but manufacturing complexity increases
Solution Approach 1:
The conductive layers serving as crack detection electrodes are integrated with the existing conductive layers that provide electrical connection functions in the display apparatus. These multi-functional conductive layers simultaneously perform both electrical connection duties and crack detection functions, thereby extending the detection range to cover the entire edge area of the substrate without requiring separate dedicated detection structures that would complicate manufacturing.
3Reliability
If multiple crack detection electrodes are implemented to detect cracks in wider area, then reliability of detection is improved, but device complexity increases
Solution Approach 1:
The crack detection function is merged with the existing conductive layers and electrical connection structures of the display apparatus. The first, second, and third conductive layers are integrated into the display's electrical architecture, serving dual purposes of electrical connection and crack detection. This merging approach enhances detection reliability through multiple distributed sensors while avoiding the complexity increase that would result from adding separate, dedicated detection systems.
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 system significantly increases the range of crack detection, enabling accurate identification of cracks in a wider area, thus preventing moisture and oxygen ingress and maintaining the reliability of the organic light-emitting diodes.
Implementation Method 1
a first conductive layer which is interposed between the substrate and the first semiconductor layer, and includes a first electrode on the display area, and a first crack detection electrode... a second conductive layer which is disposed on the first semiconductor layer, and includes a second electrode... and a second crack detection electrode... a third conductive layer which is disposed on the second conductive layer, and includes a third electrode... and a first auxiliary electrode
Data Source
AI summary
A display apparatus includes a first pad at one side of a substrate; a first semiconductor layer on the substrate; a first crack detection electrode interposed between the substrate and the first semiconductor layer, and including a first end portion at the one side and a second end portion at another side; a second crack detection electrode disposed on the first semiconductor layer, and including a first end portion located at the one side and a second end portion connected to the second end portion of the first crack detection electrode; and a first auxiliary electrode disposed on the second conductive layer, and including a first end portion connected to the second end portion of the first crack detection electrode and a second end portion electrically connected to the first pad.