Transparent Alignment Structure for OLED Panel Sealing Accuracy
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in accurately aligning substrates during the bonding process, which is crucial for effective sealing and protection of the image display unit.
Innovation Solution
Incorporation of an alignment structure featuring transparent conductive members and openings that expose these members, utilizing materials like indium tin oxide (ITO) and indium zinc oxide (IZO) to facilitate precise alignment between substrates, combined with conductive and insulating layers to enhance visibility and alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an alignment structure is added to facilitate substrate alignment, then alignment accuracy is improved, but device complexity increases
Solution Approach 1:
The alignment structure is merged with the transparent conductive member layer, combining the alignment function with the conductive layer function. The alignment marks are formed as part of the transparent conductive member pattern, eliminating the need for separate alignment structures and reducing overall device complexity while maintaining alignment accuracy.
Solution Approach 2:
The transparent conductive member serves multiple functions: it provides electrical conductivity for touch sensing, maintains transparency for display visibility, and forms alignment marks for substrate alignment. This multi-functionality reduces the number of separate components needed, addressing the complexity issue while improving alignment accuracy.
2Measurement precision
If transparent conductive members are used for alignment, then alignment visibility is improved, but manufacturing complexity increases
Solution Approach 1:
The alignment marks are merged with the transparent conductive member fabrication process. The same photolithography and etching steps used to create the conductive patterns also create the alignment marks, eliminating separate manufacturing steps and reducing complexity while improving visibility.
Solution Approach 2:
The alignment marks utilize optical contrast differences created during the fabrication process. By forming the alignment marks as part of the conductive layer pattern, they create visible contrast against the background, improving alignment visibility without requiring additional materials or complex manufacturing steps.
Data Source
AI summary
A display device may include a display panel, an input sensing unit, and an alignment structure. The display panel may include a sealing member. The input sensing unit may be disposed on the display panel. The input sensing unit may include first-type sensor electrodes directly contacting a face of a first insulator of the display device, a first-type connector electrically connecting the first-type sensor electrodes, second-type sensor electrodes directly contacting the face of the first insulator of the display device, and a second-type connector electrically connecting the second-type sensor electrodes. The alignment structure may overlap the sealing member and may include a transparent member that directly contacts the face of the first insulator of the display device.