OLED Display Substrate Groove Layout for Impurity Blocking
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Solution Overview
Problem
Existing OLED display devices face issues with impurities such as water and oxygen entering the display region through insulation layers, leading to damage of drive circuit and light emitting devices, resulting in ineffective display regions that expand over time.
Innovation Solution
A display substrate design featuring a peripheral region with an organic insulation layer containing a first groove that surrounds the display region, partially covering scan driving circuits, and extends in two directions to block impurity paths, while also including blocking walls to protect power lines and electrostatic discharge circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic insulation layer completely covers the scan driving circuits to protect them, then the protection of drive circuits is improved, but impurities can still enter through the insulation layer and damage the circuits over time
Solution Approach 1:
The organic insulation layer is segmented by forming grooves that divide it into separate regions. These grooves create a barrier structure that segments the potential impurity pathways, preventing continuous impurity migration while maintaining the overall protective coverage of the insulation layer over the scan driving circuits.
Solution Approach 2:
The insulation layer is modified locally by forming grooves at specific positions where impurity entry is most likely to occur. This local modification creates enhanced protection zones without compromising the overall coverage, allowing the insulation layer to maintain its protective function while adding targeted impurity blocking capability.
2Object-affected harmful factors
If grooves are formed in the organic insulation layer to block impurity paths, then impurity blocking is improved, but the structural integrity and coverage of the insulation layer is reduced
Solution Approach 1:
The grooves are designed to extend in multiple directions (both first direction along the display region side and second direction perpendicular to it), creating a three-dimensional barrier network within the two-dimensional insulation layer. This multi-directional groove structure blocks impurity paths more effectively while distributing the structural impact across multiple orientations.
Solution Approach 2:
The organic insulation layer is combined with inorganic insulation layers to form a composite insulation structure. The inorganic layers provide additional mechanical strength and impurity blocking capability, compensating for the structural reduction caused by grooves in the organic layer while enhancing the overall protective function.
Data Source
AI summary
A display substrate and a manufacture method thereof, and a display device are provided. The display substrate includes a display region and a peripheral region, the peripheral region includes a first scan driving circuit and a second scan driving circuit on a first side of the display region, the peripheral region further includes a binding region on a second side of the display region, the peripheral region includes an organic insulation layer, the organic insulation layer at least partially covers the first scan driving circuit and the second scan driving circuit, and includes a first groove that is in a strip shape and extends substantially along a first direction to expose a portion between the first scan driving circuit and the second scan driving circuit, the first groove also extends from the first side to the second side and extends substantially along a second direction on the second side.