Transparent Display Line Stacking for Uniform Touch Capacitance
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Solution Overview
Problem
The light transmittance of transparent display devices is reduced due to the presence of touch lines, and parasitic capacitance is increased due to the narrow spacing distance between signal lines and touch lines.
Innovation Solution
The transparent display device is designed with a non-transmissive area that includes light emission and circuit areas, where signal lines and touch lines are disposed in alternating layers to maintain sufficient spacing, reducing overlap with circuit elements and minimizing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch lines are provided in the transparent display device, then touch function is implemented, but light transmittance is reduced
Solution Approach 1:
The patent applies dimensionality change by arranging touch lines and signal lines in different layers (vertical stacking) rather than placing them side-by-side in the same plane. The touch lines are positioned in a first layer while signal lines are positioned in a second layer above the first layer, utilizing the vertical dimension to reduce horizontal spacing constraints and minimize light blocking while maintaining touch functionality.
2Area of stationary object
If spacing distance between signal lines and touch lines is reduced, then device area is minimized, but parasitic capacitance is increased
Solution Approach 1:
The patent utilizes vertical layering to separate signal lines and touch lines into different planes. By positioning signal lines in a second layer above the first layer containing touch lines, the design achieves compact horizontal spacing while maintaining sufficient vertical separation to control parasitic capacitance between the lines.
Solution Approach 2:
The patent introduces an insulating layer as an intermediary between the touch lines in the first layer and signal lines in the second layer. This insulating layer acts as a mediator that electrically isolates the two types of lines, reducing parasitic capacitance coupling while allowing the lines to be positioned close together in the horizontal plane.
3Productivity
If touch lines are positioned closer to signal lines, then layout density is improved, but uniformity of parasitic capacitance is degraded
Solution Approach 1:
The patent achieves high layout density while maintaining uniform parasitic capacitance by transitioning from horizontal to vertical arrangement. All touch lines are positioned at substantially the same horizontal position with consistent spacing, while signal lines are elevated to a different vertical layer. This vertical separation ensures uniform electrical characteristics across all touch lines despite high horizontal density.
Data Source
AI summary
A transparent display device is provided, which may reduce a parasitic capacitance average value of touch lines and improve uniformity of parasitic capacitance. The transparent display comprises a substrate provided with a non-transmissive area and a transmissive area, the non-transmissive area including at least two light emission areas in which a light emitting element is disposed and at least two circuit areas in which a circuit element is disposed, a plurality of first signal lines provided in the non-transmissive area over the substrate and extended in a first direction, at least one insulating layer provided over the first signal line, and a plurality of touch lines provided in the non-transmissive area over the at least one insulating layer and extended in the first direction. The plurality of first signal lines and the plurality of touch lines are disposed between adjacent circuit areas.