Display Substrate Alignment Key Layout for Precise Bonding
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Solution Overview
Problem
Current display devices face challenges in facilitating substrate bonding, particularly due to the difficulty in visually recognizing alignment keys from the front surface, which hinders precise alignment and bonding processes.
Innovation Solution
The display device incorporates a trench with an alignment key and a spacer made of transparent material, allowing the alignment key to be easily visible from the front surface, and a sealing member that surrounds the edges of the substrates without overlapping the alignment key, enabling precise bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the alignment key is made opaque or placed in a location not visible from the front surface, then the substrate bonding process becomes more complex or less precise, but the visibility of the alignment key from the front surface is reduced
Solution Approach 1:
The alignment key is configured to have a different color or optical property than the surrounding substrate, making it visually distinguishable from the front surface. This allows the alignment key to be easily detected during bonding while maintaining its functional role in precise alignment.
Solution Approach 2:
A transparent or translucent layer is introduced between the alignment key and the front surface, allowing light to pass through and enabling visibility of the alignment key from the front surface without interfering with its alignment function.
2Reliability
If the sealing member overlaps the alignment key to provide complete coverage, then the sealing effectiveness is improved, but the alignment key visibility and accessibility are reduced
Solution Approach 1:
The sealing member is designed with a segmented or interrupted structure that allows it to cover most of the substrate edges for effective sealing while leaving gaps or openings that expose the alignment key for visibility and accessibility during bonding operations.
Solution Approach 2:
The sealing member has different coverage characteristics at different locations: it provides complete coverage in most areas for effective sealing, but has reduced coverage or openings specifically at the alignment key location to maintain visibility and accessibility.
3Difficulty of detecting and measuring
If additional structures are added to improve alignment key visibility, then the alignment visibility is improved, but the device complexity increases
Solution Approach 1:
Existing substrate structures such as the alignment key itself or surrounding features are designed to serve multiple functions: maintaining structural integrity while simultaneously providing visibility enhancement through optical properties or geometric configurations.
Solution Approach 2:
The alignment key or surrounding substrate structures inherently provide visibility enhancement without requiring separate additional components. The existing structures are configured to naturally reflect, transmit, or contrast light to make the alignment key visible from the front surface.
Data Source
AI summary
A display device is provided. An embodiment of a display device includes a first substrate, a second substrate disposed on the first substrate, first and second partition walls disposed on the second substrate, the second partition wall being disposed outside the first partition wall, a first trench disposed inside the first partition wall and having a first width, a second trench disposed between the first and second partition walls and having a second width greater than the first width; an alignment key disposed to overlap the second trench; a first spacer disposed on the alignment key, and a sealing member disposed along an edge between the first substrate and the second substrate without overlapping the alignment key, wherein the first spacer partially overlaps the first partition wall, the second partition wall, and the sealing member.