Display Device Sealing Layer Sandwiching Detection Electrodes
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Solution Overview
Problem
Conventional touch panel display devices face challenges with increased thickness due to the overlap of touch sensor and display panels, which hinders flexibility, and defects in the sealing film can lead to moisture ingress and deterioration of organic electroluminescent elements.
Innovation Solution
A display device structure featuring a sealing layer with a stacked configuration of organic resin film, first inorganic insulating film, and second inorganic insulating film, where the first and second detection electrodes are arranged to sandwich the organic resin layer, enhancing sealing and reducing thickness by embedding foreign matter and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor panel and a display panel are overlapped to integrate touch functions, then the device achieves touch sensitivity and integrated functionality, but the thickness of the display device increases
Solution Approach 1:
The patent merges the touch sensor panel and display panel into a single integrated structure where the touch sensor is formed within the display panel structure itself. The first and second detection electrodes are arranged in different layers above the pixel region, with the sealing layer sandwiched between them, eliminating the need for a separate overlapped sensor panel and reducing overall thickness.
Solution Approach 2:
The patent transitions from a planar two-dimensional electrode arrangement to a three-dimensional stacked configuration. The first detection electrode is provided above the pixel region while the second detection electrode is provided below the pixel region, with the sealing layer in between, utilizing vertical layering to achieve touch sensor functionality without increasing lateral thickness.
2Reliability
If a sealing layer is formed to protect organic EL elements from moisture, then the reliability of display elements is improved, but defects in the sealing film can still allow moisture ingress
Solution Approach 1:
The patent employs a composite sealing layer structure consisting of multiple materials: an organic resin film and at least one inorganic insulating film. This composite structure combines the advantages of different materials to provide effective moisture barrier protection while accommodating foreign matter without forming defects, ensuring high reliability of the sealing function.
Solution Approach 2:
The organic resin film acts as an intermediary layer that embeds foreign matter, preventing it from causing defects in the inorganic insulating film. This intermediary structure allows the sealing layer to maintain its integrity and moisture-blocking function even in the presence of foreign particles during manufacturing.
3Manufacturing precision
If foreign matter is attached to the substrate surface before sealing film formation, then the sealing film cannot be evenly formed, but removing foreign matter adds process complexity
Solution Approach 1:
The patent converts the harmful effect of foreign matter into a beneficial outcome by allowing the organic resin film to embed the foreign particles. This embedding process prevents the foreign matter from causing defects in the inorganic insulating film while avoiding the need for additional foreign matter removal process steps, thus maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the physical state and properties of the sealing layer by using an organic resin film with embedding capability. This parameter change allows the sealing structure to accommodate foreign matter without compromising film uniformity or requiring additional cleaning processes, simplifying the overall manufacturing workflow.
4Reliability
If detection electrodes are formed by sputtering method to achieve conductivity, then the electrode functionality is improved, but foreign matter is generated during the process
Solution Approach 1:
The organic resin film serves as an intermediary layer formed between the first and second inorganic insulating films. This intermediary layer embeds foreign matter generated during the sputtering process of the detection electrodes, preventing the foreign particles from causing short circuits between electrodes while maintaining the electrodes' conductivity functionality.
Solution Approach 2:
The patent provides beforehand cushioning by forming the organic resin film to embed foreign matter that may be generated during subsequent sputtering processes. This preventive measure ensures that foreign particles do not cause electrode short circuits, maintaining reliability without requiring changes to the sputtering process itself.
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 structure reduces the thickness of the display device, improves sealing efficacy, and prevents moisture ingress, thereby maintaining the integrity of organic electroluminescent elements and enhancing touch sensor sensitivity.
Implementation Method 1
The sealing layer including at least an organic resin film, a first inorganic insulating film provided below the organic resin film, and a second inorganic insulating film provided above the organic resin film
Data Source
AI summary
A display device is provided including a pixel region arranging a plurality of pixels on a planar surface on the first side of a substrate, a sealing layer covering a surface on the opposite side of the substrate side of the pixel region, a first detection electrode extending in a direction on a layer above the pixel region on the side where the sealing layer is provided, and a second detection electrode extending in a direction intersecting with the direction in another layer different from that of the first detection electrode in a layer above the pixel region. The sealing layer including at least an organic resin film, a first inorganic insulating film, and a second inorganic insulating film, the first detection electrode or the second detection electrode is provided above the organic resin layer, the other electrode is provided below the organic resin layer.