Resin Dam Design for Display Module OCR Leakage Prevention
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Solution Overview
Problem
The housing-in technique for display apparatus manufacturing faces challenges such as display quality degradation due to stress-induced defects and OCR leakage, which contaminates the display module and is difficult to cure, leading to increased costs and complexity.
Innovation Solution
A display apparatus design featuring a resin dam that hangs over the edge of the housing, providing additional support and preventing OCR leakage, combined with corner treatments on the housing to reduce bulges and enhance adhesion, ensuring proper UV curing and minimizing display abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing-in technique is used to bond the front panel to the display module, then manufacturing cost is reduced and components can be shared, but the rear face of the upper-lower substrate cannot be planarly or uniformly pressurized, causing display defects such as unevenness or color change
Solution Approach 1:
A resin member is introduced as an intermediary element between the housing and the upper-lower substrate. This resin member fills the space and provides uniform pressure distribution across the rear face of the upper-lower substrate, eliminating display defects while maintaining the housing-in technique's cost advantages
Solution Approach 2:
The physical state and properties of the resin member are utilized to achieve uniform pressure distribution. By controlling the resin's viscosity, curing characteristics, and pressure transmission properties, the system achieves planar pressure distribution that prevents display defects
2Reliability
If OCR is used to bond the front panel to the display module, then visibility is improved and impact resistance is enhanced, but OCR may leak out and contaminate the display module, requiring additional sealing measures
Solution Approach 1:
The resin member serves as a mediator between the housing and the OCR, providing a sealing function that prevents OCR leakage while maintaining the optical bonding benefits. The resin member creates a barrier that contains the OCR within the intended bonding space
Solution Approach 2:
The resin member is positioned beforehand to prevent OCR leakage before it can contaminate the display module. This proactive sealing approach eliminates the need for additional corrective measures and ensures clean manufacturing
3Object-generated harmful factors
If the resin member seals the OCR completely, then OCR leakage is prevented, but UV light cannot reach leaked OCR to cure it, allowing contamination to occur
Solution Approach 1:
The resin member is designed with specific local properties: it is positioned and shaped to seal against the housing at specific locations while maintaining UV light transmission pathways. This localized sealing approach prevents leakage without blocking the curing process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution improves display quality and manufacturing yield by preventing OCR leakage and stress-induced defects, reducing development costs, and simplifying the manufacturing process while maintaining high visibility and impact resistance.
Implementation Method 1
a resin member formed on the upper-lower substrate along the entire periphery of a boundary part of the housing adjacent to the opening
Implementation Method 2
the leaking OCR may be cured later by ultra violet (UV) curing resin used for the OCR
Data Source
AI summary
Provided is a display apparatus or the like based on a housing-in technique capable of improving display quality and yield. A display apparatus comprises an upper-lower substrate 100, a display module 103 including a housing 102 with an opening, a resin member 105 formed on the upper-lower substrate 100 along an entire periphery of an opening of the housing 102, and a front panel 106 opposed to the display module 103 across the resin member 105. The housing 102 is so placed as to be interposed between the upper-lower substrate 100 and the front panel 106. A worked surface 500 is located at a part of a ridge line of a boundary part of the housing 102. The resin member 105 is in contact with the entire periphery of the boundary part of the housing 102 and hangs over the inner edge of the upper surface of the housing 102.