Optical Layer Between Conductive Lines for UV Curing
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Solution Overview
Problem
The integration of a touch screen panel with a display device faces challenges in ensuring adequate curing of the sealing material between substrates, leading to potential bonding failures and increased resistance or short circuits due to the narrow non-display area, which compromises the exfoliation force and display performance.
Innovation Solution
The conductive lines in the non-display area are overlapped with a sealing material, and an optical layer is formed between these lines to allow light transmission and improve curing, using materials like indium tin oxide (ITO) with a refractive index of 2 or more, facilitating better bonding and reducing resistance and short circuit risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is narrowed to maximize display area, then the display area increases, but the sealing material cannot be adequately cured leading to bonding failures
Solution Approach 1:
An optical layer is introduced as an intermediary between the conductive lines and the sealing material. This optical layer has high light transmittance and allows UV light to pass through to the sealing material, enabling proper curing while the conductive lines are positioned above the sealing material in the non-display area.
Solution Approach 2:
The patent applies different properties to different regions: the optical layer is specifically positioned in areas where conductive lines overlap with the sealing material, providing localized light transmission exactly where needed for curing, while maintaining the narrow non-display area design elsewhere.
2Area of stationary object
If the non-display area is narrowed to maximize display area, then the display area increases, but the risk of resistance increase and short circuits increases
Solution Approach 1:
The optical layer serves as an intermediary that enables proper curing of the sealing material through the conductive lines, ensuring good electrical contact and preventing resistance increase or short circuits that would result from inadequate bonding.
Solution Approach 2:
The conductive lines are positioned to overlap with the sealing material in advance, and the optical layer is configured to ensure proper curing occurs before final assembly, preventing electrical reliability issues beforehand rather than addressing them after they occur.
3Reliability
If an optical layer is added to improve sealing material curing, then the bonding reliability improves, but the device complexity increases
Solution Approach 1:
The optical layer is designed to serve multiple functions: it provides high light transmittance for UV curing of the sealing material, maintains electrical insulation properties, and integrates with the existing conductive line structure. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The patent merges the optical layer integration with the existing conductive line and sealing material structure. The optical layer is positioned to work in conjunction with the conductive lines that are already overlapping the sealing material, combining curing functionality with the existing electrical connection structure rather than adding completely separate systems.
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 configuration enhances the bonding between substrates, minimizes the risk of exfoliation and resistance increase, and prevents short circuits, while maintaining a thin and efficient touch screen panel design.
Implementation Method 1
an optical layer is formed between two immediately neighboring conductive lines among the plurality of conductive lines... the optical layer may be formed of a material having a refractive index of about 2 or more while allowing light to be transmitted therethrough
Implementation Method 2
the optical layer may be formed of a material having a refractive index of about 2 or more
Data Source
AI summary
A display device integrated with a touch screen panel includes upper and lower substrates; the upper substrate comprising a major surface; a display area and a non-display area next to the display area when viewed in a viewing direction perpendicular to the major surface; and a sealing material formed between the upper and lower substrates and in the non-display area when viewed in the viewing direction. The display further includes a sensing cell structure formed over the upper substrate and in the display area; conductive lines formed over the upper substrate and in the non-display area, and connected to the sensing cell structure. The conductive lines overlap with the sealing material; and an optical layer is formed between two immediately neighboring conductive lines among the conductive lines.