Offset-Compensating Support Strip for OLED Net Tensioning
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Solution Overview
Problem
The support strip used in the evaporation process for OLED display panel manufacturing tends to deviate from the stretch direction during the net-tensioning process, leading to abnormal evaporation and low precision, which affects the overall display effect.
Innovation Solution
A support strip design incorporating a support segment and a predetermined cutting segment with an offset-compensating portion, where the offset-compensating portion gradually decreases in width from the support body to a free end, reducing non-stretching-direction offset values and improving net-tensioning accuracy, and a net-tensioning method involving stretching, welding, and removing the cutting segment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a special support strip is used to shield a part of a to-be-evaporated region and support a mask bar, then the evaporation process can be performed with functional integration region protection, but the support strip is prone to deviation relative to the stretch direction during the stretching process, causing abnormal evaporation and low evaporation precision
Solution Approach 1:
The patent applies preliminary action by pre-designing the support strip with an asymmetric structure and predetermined cutting segments before the stretching process. The offset-compensating portion is built into the support strip structure in advance, which anticipates and compensates for the deviation that will occur during stretching, thereby maintaining evaporation precision without compromising the shielding function
Solution Approach 2:
The patent employs asymmetry by designing the support strip with an asymmetric structure where the offset-compensating portion has different widths at different locations. This asymmetric design creates a deliberate offset that counteracts the stretching-induced deviation, allowing the support strip to maintain alignment accuracy despite the stretching process, thus resolving the contradiction between reliability and manufacturing precision
2Ease of manufacture
If the support strip structure is simplified for ease of manufacture, then the manufacturing cost and complexity are reduced, but the net-tensioning accuracy and alignment precision are compromised
Solution Approach 1:
The patent applies segmentation by dividing the support strip into distinct segments: the support body, the offset-compensating portion, and the predetermined cutting segments. This segmentation allows each part to be manufactured independently with standard processes, maintaining ease of manufacture, while the coordinated arrangement of these segments achieves the complex function of offset compensation and high net-tensioning accuracy
Solution Approach 2:
The patent employs local quality by concentrating the offset-compensation function in a specific local region (the offset-compensating portion) rather than requiring the entire support strip to have complex features. This localized approach maintains simplicity in most areas (ease of manufacture) while achieving high precision where needed (net-tensioning accuracy through the asymmetric offset-compensating portion)
Data Source
AI summary
A support strip and a method of new tensioning. The support strip includes a support segment and a predetermined cutting segment. Each of two ends of the support segment is connected with the predetermined cutting segment in a length direction of the support strip. The support segment includes a support body and a covering portion. The support body extends in a length direction. The covering portion is located at a first side of the support body. A second side of the support body is opposite to the first side in a width direction perpendicular to the length direction. The predetermined cutting segment comprises an offset-compensating portion. A first side edge of the offset-compensating portion extends in the length direction. A second side edge of the offset-compensating portion is inclined from the second side to the first side.