Flexible Substrate Markers for Display Peeling Stability
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Solution Overview
Problem
The challenge in manufacturing organic EL display devices on flexible substrates is maintaining a stable size during the peeling process from a support substrate, as expansion or shrinkage can lead to size changes, disrupting the manufacturing process.
Innovation Solution
Incorporating first and second markers in the corner areas of the substrate, extending along the longer and shorter axes respectively, to facilitate precise cutting lines that account for potential size changes, ensuring stable substrate dimensions post-peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flexible substrate is used for manufacturing organic EL display devices, then the device can be made with wide viewing angle and high precision display, but the substrate may expand or shrink when peeled from the support substrate, causing size changes and manufacturing instability
Solution Approach 1:
The patent applies preliminary action by forming markers on the substrate before peeling from the support substrate. These markers are used to measure and calculate expansion/shrinkage amounts in advance, allowing the cutting positions to be adjusted beforehand to compensate for expected size changes, thus maintaining manufacturing precision despite substrate instability
Solution Approach 2:
The patent changes the parameter of cutting position based on measured expansion/shrinkage amounts. By calculating the actual size changes after peeling and adjusting the cutting positions accordingly, the system compensates for substrate dimension variations and maintains stable final product dimensions
2Stability of the object's composition
If the substrate size changes due to expansion or shrinkage during peeling, then the manufacturing process becomes unstable, but adding markers and measurement steps increases process complexity
Solution Approach 1:
The substrate itself serves the dual purpose of being the display component and the measurement reference. The markers are formed directly on the substrate using the same thin film formation processes, allowing the substrate to self-measure its own expansion/shrinkage without requiring external measurement equipment or additional complex processes
Solution Approach 2:
The markers serve multiple functions: they are both part of the display substrate structure and serve as reference points for measuring expansion/shrinkage. This multi-functionality eliminates the need for separate measurement references, reducing overall process complexity while maintaining stability
3Ease of manufacture
If cutting positions are not adjusted for substrate expansion or shrinkage, then the manufacturing process remains simple, but the final product dimensions become inconsistent
Solution Approach 1:
The patent implements feedback by measuring the actual expansion/shrinkage amounts using the markers after peeling, calculating the dimension changes, and using this information to adjust the cutting positions. This closed-loop feedback ensures consistent final product dimensions while maintaining relatively simple manufacturing processes
Data Source
AI summary
A display device includes a substrate; a display portion located on the substrate, the display portion including a plurality of pixels; a first marker located in an end area that is along a longer side of the substrate and is in at least one of four corner areas of the substrate, the first marker extending in a longer axis direction of the substrate; and a second marker located in an end area that is along a shorter side of the substrate and is in the same corner area as that of the first marker, the second marker extending in a shorter axis direction of the substrate.