PSA Placement Accuracy via Intermediary Fixture
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Solution Overview
Problem
The placement of pressure-sensitive adhesive (PSA) on display devices often results in misalignment due to tolerance stackup, leading to adhesion issues and visible gaps, which affect the device's appearance and functionality.
Innovation Solution
A PSA application fixture that directly references the deck of a display device's body, using index features to align and adhere the PSA, reducing the tolerance stackup and achieving a tighter PSA placement accuracy of 0.10-0.25 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional PSA placement methods are used, then the placement process is simple, but misalignment occurs due to tolerance stackup leading to adhesion issues and visible gaps
Solution Approach 1:
The patent introduces a PSA application fixture as an intermediary device between the display module and the deck. This fixture includes reference features that interface with reference features on the deck, serving as a mediator to transfer precise positioning information and eliminate tolerance stackup accumulation. The fixture acts as a controlled intermediary that enables accurate PSA placement without requiring direct complex alignment between the display module and deck components.
2Manufacturing precision
If tolerance stackup is reduced through direct referencing, then PSA placement accuracy improves to 0.10-0.25 mm, but the fixture design becomes more complex with index features
Solution Approach 1:
The PSA application fixture is pre-manufactured with precise reference features (index features) that are established before the actual PSA placement process. These reference features are precisely positioned on the fixture during fixture manufacturing, and then the fixture itself is used as the reference for placing the PSA. This preliminary establishment of reference features separates the precision requirement from the final assembly process, making the overall system easier to manufacture while achieving high precision.
3Shape
If PSA is placed with tight alignment, then visible gaps are minimized and appearance is improved, but the alignment process becomes more complex
Solution Approach 1:
The PSA application fixture serves as an intermediary alignment tool that incorporates reference features matching those on the deck. By using this fixture as a mediator, the complex task of achieving tight alignment is transferred to the fixture design rather than requiring complex alignment procedures during assembly. The fixture physically guides the PSA placement to achieve minimal visible gaps through its pre-designed reference feature interfaces.
Data Source
AI summary
Examples are disclosed that relate to aligning a pressure sensitive adhesive to a body of a display device for attachment of a display module to the display device. One example provides an electronic display device comprising a body, the body comprising a wall and a deck extending inwardly from the wall. The deck comprises a first reference feature configured to interface with a first index feature on a pressure sensitive adhesive application fixture, and a second reference feature configured to interface with a second index feature on the pressure sensitive adhesive application fixture. The electronic display device further comprises a display module supported by the deck, and a pressure sensitive adhesive adhering the display module to the deck.