Linear Sensor Electrode Layout for Uniform Display Overcoating
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Solution Overview
Problem
The application of an organic resin material as an overcoat layer in display devices with mesh-like sensor electrodes is hindered by non-uniform coverage due to the mesh-shaped electrode pattern, leading to potential connectivity issues and reduced reliability.
Innovation Solution
A display device design featuring a linear sensor electrode with cut-off portions at the boundaries of sub-pixels, allowing for uniform application of the overcoat layer and improved connectivity, ensuring seamless integration with external driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mesh-like sensor electrodes are used to reduce resistance, then electrical conductivity is improved, but uniform application of the overcoat layer deteriorates due to steps formed by the electrode pattern
Solution Approach 1:
The patent extracts the problematic mesh pattern from the sensor electrode design and replaces it with a linear electrode configuration. This removes the source of the steps that prevent uniform overcoat application, while still maintaining the necessary electrical conductivity through the linear electrode path.
Solution Approach 2:
The patent applies different electrode configurations to different regions: linear electrodes are used where uniform overcoat application is critical, while still maintaining sensor functionality. This local adaptation of the electrode structure resolves the contradiction between conductivity and coating uniformity.
2Reliability
If mesh-shaped electrode pattern is used, then resistance is reduced, but complete coverage with overcoat layer deteriorates
Solution Approach 1:
The mesh pattern is extracted and removed from the design, replacing it with a linear electrode structure that does not create steps or obstacles to the overcoat application process, thereby ensuring complete coverage.
Solution Approach 2:
Instead of using a mesh pattern that creates multiple small obstacles to coating, the patent inverts the approach by using a simple linear electrode configuration that allows the overcoat to flow smoothly and cover the entire surface uniformly.
3Manufacturing precision
If linear sensor electrode with cut-off portions is used, then uniform overcoat application is achieved, but electrode continuity is disrupted
Solution Approach 1:
The linear electrode is segmented with cut-off portions at specific locations where it intersects with pixel boundaries. These segments are positioned strategically to maintain electrode functionality while allowing uniform overcoat application across the entire surface.
Solution Approach 2:
The cut-off portions are applied locally at electrode-pixel boundary intersections rather than throughout the entire electrode structure. This localized modification maintains electrode continuity in critical areas while enabling uniform overcoat coverage in other areas.
Data Source
AI summary
A display device includes at least one pixel including a plurality of sub-pixels, and a linear sensor electrode extending along a boundary of the plurality of sub-pixels and surrounding a periphery of the at least one pixel. The sensor electrode has at least one cut-off portion at the boundary of the plurality of sub-pixels. The sensor electrode can include a first sensor electrode extending along the boundary of a plurality of sub-pixels and a second sensor electrode that surrounds the periphery of at least one pixel continuous from the first sensor electrode, and the cut-off portion can be located at the boundary of the first sensor electrode with the second sensor electrode.