Hole-Area Display Circuit Layout for Crack Sensing
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Solution Overview
Problem
Cracks can occur adjacent to the hole area in display devices during the drilling process for preparing penetrating portions, leading to defects such as disconnection of lines, increased resistance, and oxygen or moisture permeation paths.
Innovation Solution
A display device with a circuit layer and element layer on a substrate, including a crack sensing line in the hole peripheral area, and first and second sensing auxiliary lines extending in parallel with the data lines and connected to the crack sensing line, allowing for the detection of cracks through a voltage difference between sensing transmission lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a penetrating portion is drilled through the substrate to secure light path or sound wave path, then optical or acoustic functionality is improved, but cracks may occur adjacent to the penetrating portion due to physical or chemical shock during drilling
Solution Approach 1:
The patent applies preliminary action by forming a relief groove in the substrate before drilling the penetrating portion. This groove is created in advance to redirect cracks away from critical areas, preventing them from propagating into the display area and compromising substrate integrity while still allowing the penetrating portion to be drilled for optical or acoustic functionality.
2Productivity
If cracks occur adjacent to the hole area during drilling, then manufacturing process is completed, but defects such as disconnection of lines, increased resistance, and oxygen or moisture permeation paths are generated
Solution Approach 1:
The patent uses an intermediary approach by introducing a relief groove as a mediating structure between the penetrating portion and the surrounding substrate. This groove acts as a crack arrester that intercepts and redirects crack propagation, preventing cracks from reaching and damaging the circuit lines, thereby maintaining line integrity while allowing the drilling process to complete.
3Difficulty of detecting and measuring
If sensing lines are placed in the hole peripheral area to detect cracks, then crack detection capability is improved, but the sensing lines themselves may be damaged by cracks
Solution Approach 1:
The patent applies preliminary action by forming the relief groove before placing or exposing the sensing lines in the hole peripheral area. This pre-formed groove creates a protective barrier that redirects cracks away from the sensing lines, allowing the sensing lines to detect cracks in the display area without being damaged by cracks originating from the penetrating portion.
4Measurement precision
If the crack sensing line is disposed in the hole peripheral area, then crack sensing in the critical area is improved, but the crack sensing line may be damaged by cracks extending from the hole area
Solution Approach 1:
The relief groove serves as an intermediary protective structure that physically separates the crack propagation path from the crack sensing line. The groove is positioned between the penetrating portion and the sensing line, intercepting cracks and redirecting them away from the sensing line, thereby protecting the sensing line while maintaining its ability to detect cracks in the display area with high precision.
Data Source
AI summary
A display device includes a substrate, a circuit layer, and an element layer. The substrate includes a main area including a display area in which light emitting areas are arranged and a non-display area, a sub-area, a hole area, and a hole peripheral area. The element layer includes light emitting elements disposed in the light emitting areas, respectively. The circuit layer includes light emitting pixel drivers electrically connected to the light emitting elements, respectively, data lines electrically connected to the light emitting pixel drivers, a crack sensing line disposed in the hole peripheral area, and a first sensing auxiliary line and a second sensing auxiliary line extending in parallel with the data lines, paired with two of the data lines crossing the hole peripheral area, respectively, and electrically connected to ends of the crack sensing line, respectively.