OLED Substrate Groove Detection for Moisture-Blocking Reliability
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Solution Overview
Problem
Existing OLED devices face issues with damage to the tip of the groove in the substrate, leading to potential moisture and water penetration, which can cause pixel defects, and this damage is difficult to visually detect during manufacturing.
Innovation Solution
The OLED device incorporates a conductive pattern that overlaps the groove, allowing for resistance value measurement to detect tip damage, and includes a multi-layered substrate structure with organic and inorganic film layers to enhance moisture and water blocking, along with a touch screen structure for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is formed in the substrate to separate regions, then the structural integrity and display quality are improved, but the tip of the groove becomes vulnerable to damage causing moisture penetration
Solution Approach 1:
The patent applies preliminary action by forming a conductive pattern that overlaps the groove before final assembly, enabling early detection of groove tip damage through resistance measurement. This allows potential moisture ingress issues to be identified before the device is sealed and shipped, preventing pixel defects from occurring.
Solution Approach 2:
The conductive pattern serves as an intermediary element that bridges the groove structure with the external measurement system. By positioning the conductive pattern to overlap the groove and connect to external devices, it enables non-destructive detection of groove integrity through electrical resistance measurement without requiring physical inspection of the groove tip.
2Difficulty of detecting and measuring
If visual inspection is used to detect groove damage, then the detection process is simple, but the damage is difficult to visually detect
Solution Approach 1:
The patent replaces mechanical/visual inspection with an electrical detection system. The conductive pattern forms part of an electrical circuit where groove tip damage alters electrical resistance. By substituting visual inspection with electrical resistance measurement, the system achieves reliable detection of groove damage that is invisible to the naked eye, while keeping the measurement process relatively simple through automated electrical testing.
Solution Approach 2:
The conductive pattern acts as an intermediary that translates physical groove damage into an electrical signal change. This mediator enables indirect detection of groove tip damage through resistance measurement, converting a difficult-to-see mechanical defect into a measurable electrical property that can be detected automatically during manufacturing.
3Reliability
If a multi-layered substrate structure is used to block moisture, then the moisture blocking capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies composite materials by creating a multi-layered substrate structure combining organic and inorganic film layers. Each layer provides specific moisture blocking properties, with inorganic layers offering superior barrier performance and organic layers providing flexibility and adhesion. This composite structure achieves enhanced moisture blocking capability by leveraging the complementary properties of different material types.
Solution Approach 2:
The patent applies local quality by positioning different types of film layers at specific locations within the substrate structure. The multi-layered configuration places inorganic barrier layers at critical moisture exposure points and organic layers where flexibility is needed, optimizing moisture blocking performance at each location rather than using a uniform structure throughout.
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 solution effectively reduces pixel defects by detecting and preventing moisture ingress, improving the reliability and manufacturing yield of OLED devices.
Implementation Method 1
The conductive pattern overlaps the groove, allowing for resistance value measurement to detect tip damage
Implementation Method 2
multi-layered substrate structure with organic and inorganic film layers to enhance moisture and water blocking
Data Source
AI summary
An organic light emitting display device includes a substrate, a light emitting structure, a first conductive pattern, and a functional module. The substrate has an opening region, a peripheral region surrounding the opening region, and a display region surrounding the peripheral region, and includes a first groove, which has an enlarged lower portion, formed in the peripheral region and an opening formed in the opening region. The light emitting structure is in the display region on the substrate. The first conductive pattern overlaps the first groove in the peripheral region on the substrate. The functional module is in the opening of the substrate.