Conductive Sealing Layer for Display Noise Suppression
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Solution Overview
Problem
The manufacturing process of organic electroluminescence (EL) display devices is inefficient due to the increased number of steps required for forming ITO films, which can lead to electromagnetic noise interference affecting attached touch panels.
Innovation Solution
A display device with a substrate, pixels, an insulating layer, and a conductive layer containing binder resin and nanowires/nanotubes, where the conductive layer has a sheet resistance of 5000 ohms per square or less, positioned opposite the insulating layer, and a touch panel is placed on the opposite side of the conductive layer, along with a manufacturing method involving the formation of pixels, a sealing layer, and a conductive layer that extends over both the display and outside areas, allowing for efficient electromagnetic noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an ITO film is formed on the substrate to suppress electromagnetic noise, then the touch panel malfunction is prevented, but the number of manufacturing steps increases
Solution Approach 1:
The patent combines the electromagnetic noise shielding function with the existing sealing layer by forming a conductive layer on the sealing layer. This integration allows the sealing layer to serve dual purposes: sealing the display device and shielding against electromagnetic noise, thereby eliminating the need for separate ITO film formation steps and maintaining manufacturing efficiency.
Solution Approach 2:
The sealing layer is given multiple functions by adding the conductive layer. It now serves as both the sealing structure and the electromagnetic noise shield, protecting the touch panel from malfunction while maintaining the original sealing purpose. This multi-functionality resolves the contradiction by avoiding additional manufacturing steps.
2Object-affected harmful factors
If a conductive layer with binder resin and nanowires/nanotubes is used, then electromagnetic noise is suppressed with sheet resistance of 5000 ohms per square or less, but the complexity of material composition increases
Solution Approach 1:
The conductive layer is formed as a composite material combining binder resin with conductive components (nanowires and/or nanotubes). This composite structure provides effective electromagnetic noise shielding with achievable sheet resistance while using materials that can be processed together in a single layer formation step, managing complexity through integrated material design.
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 effectively suppresses electromagnetic noise while maintaining good manufacturing efficiency, ensuring the display device's performance and reducing interference with attached touch panels.
Implementation Method 1
a conductive layer which is located at an opposite side of the insulating layer from the plurality of pixels and covers the plurality of pixels
Data Source
AI summary
A display device according to an embodiment of the present invention includes: a substrate; a plurality of pixels arranged on the substrate; an insulating layer which covers the plurality of pixels; and a conductive layer which is located at an opposite side of the insulating layer from the plurality of pixels and covers the plurality of pixels.