OLED Display Substrate Blocking Region Design
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Solution Overview
Problem
In the manufacturing of OLED display substrates, metal particles generated during the patterning process can attach to exposed wires in the pad region and flow into the display region during the development process, causing dark spots and defects due to the lack of effective blocking mechanisms.
Innovation Solution
A display substrate motherboard design with a base substrate featuring substrate areas, display regions, and pad regions, where a blocking region with a first groove is introduced between adjacent substrate areas, creating a spacer region with a reduced thickness of the display structure layer, which blocks metal particles from entering the display region by utilizing a gradient thickness difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional uniform thickness display structure layer is used, then the manufacturing process is simple, but metal particles can flow into the display region causing dark spots and defects
Solution Approach 1:
The display structure layer is designed with different thicknesses in different regions: a first thickness in the display region and a second thickness in the spacer region. This local quality variation creates a thickness difference that blocks metal particles from flowing into the display region, thereby improving display quality without requiring complete structural redesign
Solution Approach 2:
The display substrate is divided into multiple substrate areas with blocking regions between them. The display structure layer is segmented to include both a display region portion and a spacer region portion, with the spacer region acting as a blocking barrier between adjacent substrate areas. This segmentation prevents metal particle contamination while maintaining overall structural integrity
2Object-affected harmful factors
If a blocking region with groove is introduced between adjacent substrate areas, then metal particles are blocked from entering the display region, but the manufacturing process becomes more complex
Solution Approach 1:
The thickness parameter of the display structure layer is changed in the spacer region to create a blocking effect. By controlling the thickness to be different from the display region, the structure naturally blocks metal particles without requiring additional blocking components or complex manufacturing steps
Solution Approach 2:
The blocking region with groove is designed into the structure before the metal particle contamination problem occurs during manufacturing. The thickness difference is established in advance during the layer formation process, creating a preventive barrier that automatically blocks metal particles during subsequent manufacturing steps
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 gradient thickness difference effectively blocks metal particles from entering the display region, preventing dark spots and improving the uniformity of the display panel by ensuring that metal particles fall into the groove rather than flowing into the display area.
Implementation Method 1
a first groove is formed in a portion of the display structure layer in the blocking region, and a portion of the display structure layer between the first groove and the pad region adjacent to the first groove constitutes a first spacer region
Implementation Method 2
ensuring that metal particles fall into the groove rather than flowing into the display area
Data Source
AI summary
The disclosure provides a display substrate motherboard, a manufacturing method thereof, a display panel motherboard and a manufacturing method of a display substrate. The display substrate motherboard includes a base substrate including multiple substrate areas, each substrate area including a display region and a pad region; a display structure layer located on the base substrate and including a pixel defining layer and multiple film layers located between the pixel defining layer and the base substrate, a blocking region is arranged between any two adjacent substrate areas; a portion of the display structure layer in the blocking region has a first groove therein, a portion of the display structure layer between the first groove and the pad region adjacent thereto constitutes a first spacer region; a thickness of the portion of the display structure layer in the first spacer region is less than that in the display region.