Under-Display Sensing Layout With Crack Detection Around Module Holes
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Solution Overview
Problem
Existing electronic devices face challenges in efficiently detecting external inputs while maintaining a minimal bezel area and ensuring reliable operation of electronic components, particularly due to the need for overlapping modules and sensing units that increase the bezel width.
Innovation Solution
The electronic device incorporates a sensing unit divided into a hole area overlapping an electronic module, with first and second sensing electrodes insulated from each other, and includes routing patterns and crack detection circuits to enhance reliability and reduce bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing electrodes are disposed in the active area to provide even sensitivity, then sensing uniformity is improved, but the bezel area increases due to overlapping modules
Solution Approach 1:
The sensing unit is divided into multiple regions: a hole area overlapping the electronic module, an active area surrounding the hole area, and a peripheral area adjacent to the active area. This segmentation allows different regions to serve different functions while maintaining overall sensing uniformity without increasing the bezel area.
Solution Approach 2:
The patent introduces a vertical layering dimension by dividing the sensing unit into multiple conductive layers (first conductive layer and second conductive layer) with different detection insulating layers between them. This multi-layer structure enables even sensitivity distribution without requiring additional horizontal space that would increase the bezel area.
2Area of moving object
If electronic modules are overlapped to minimize device size, then device compactness is improved, but detection reliability deteriorates due to signal interference
Solution Approach 1:
Detection insulating layers are introduced as intermediary structures between the first and second conductive layers, and between the sensing electrodes and the electronic module. These insulating layers electrically isolate the sensing signals from the electronic module signals, preventing interference while allowing the module to overlap with the active area, thus maintaining both compactness and detection reliability.
3Area of stationary object
If sensing electrodes are extended to cover the entire active area, then sensing coverage is improved, but manufacturing complexity increases
Solution Approach 1:
The sensing electrodes are segmented into main patterns in the active area and neighboring patterns in the hole and peripheral areas, with different connection methods for each region. This segmentation allows simplified manufacturing in each region while achieving complete sensing coverage across the entire active area.
Solution Approach 2:
Instead of providing continuous sensing electrodes across the entire active area, the patent uses main patterns in the active area combined with neighboring patterns and routing patterns in surrounding regions. This partial coverage approach with strategic placement achieves sufficient sensing coverage while reducing manufacturing complexity compared to continuous electrode structures.
Data Source
AI summary
An electronic device including a display unit including a hole area, an active area surrounding the hole area, and a peripheral area adjacent to the active area; a sensing unit disposed on the display unit and including first and second sensing electrodes; a module hole through which the display unit and the sensing unit overlap the hole area; and a crack detection circuit including a crack detection pattern disposed in the hole area and surrounding the module hole, a crack detection line disposed in the peripheral area, and connection lines disposed in the peripheral area and connecting the crack detection pattern and the crack detection line, in which the connection lines and a routing pattern of at least one of the first and second sensing electrodes intersect on a plane.