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 in a second layer, with insulating layers separating them. This vertical arrangement allows both touch functionality and light transmittance to coexist, as the touch lines can be made transparent or semi-transparent in the transmissive area while maintaining electrical 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 resolves this contradiction by moving the interaction from horizontal spacing to vertical layering. Instead of increasing horizontal distance between signal lines and touch lines (which would increase area), the patent stacks them in different layers with insulating layers between them. This maintains small horizontal spacing for area efficiency while using vertical separation to control parasitic capacitance through the insulating barrier.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between signal lines and touch lines. These insulating layers act as mediators that allow the lines to be positioned close together horizontally (minimizing area) while preventing direct electrical interaction that would create parasitic capacitance. The insulating material provides electrical isolation while permitting close spatial arrangement.
3Adaptability or versatility
If touch lines are positioned close to circuit elements, then routing flexibility is improved, but parasitic capacitance uniformity is degraded
Solution Approach 1:
The patent uses vertical layering to decouple routing flexibility from parasitic capacitance control. Signal lines and touch lines can be routed flexibly in their respective layers to accommodate circuit design requirements, while the consistent vertical spacing and insulating layer structure ensure uniform parasitic capacitance characteristics across different routing configurations.
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.