Transparent Touch Display Line Layout for Higher Transmittance
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Solution Overview
Problem
Transparent display devices face issues with reduced light transmittance and increased parasitic capacitance due to the presence of touch sensors and touch lines, particularly when signal lines and touch lines are closely spaced.
Innovation Solution
The transparent display device is designed with a specific arrangement of touch lines and signal lines, where the first touch line is spaced further from the signal line, and the second touch line overlaps with a scan line, reducing parasitic capacitance and minimizing light transmittance loss by positioning touch lines in non-transmissive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch sensors and touch lines are added to implement touch function, then touch sensitivity is improved, but light transmittance is reduced
Solution Approach 1:
The patent positions touch lines in the non-transmissive area (a different spatial zone) rather than the transmissive area, effectively using dimensional separation to avoid light blocking while preserving touch functionality. The touch lines are arranged in a direction substantially perpendicular to the light transmission direction, creating spatial separation between the touch sensing function and the light transmission function.
Solution Approach 2:
The patent applies different spatial arrangements to different functional areas: touch lines are specifically positioned in the non-transmissive area where they do not interfere with light transmission, while the transmissive area maintains high light transmittance. This local differentiation allows each area to optimize its primary function without compromising the other.
2Device complexity
If signal lines and touch lines are closely spaced to reduce device complexity, then device complexity is reduced, but parasitic capacitance is increased
Solution Approach 1:
The patent separates signal lines and touch lines into different spatial zones (transmissive area vs. non-transmissive area) and arranges them in perpendicular directions, effectively using dimensional separation to minimize parasitic capacitance while maintaining a compact overall device structure.
Solution Approach 2:
The patent employs an asymmetric arrangement where touch lines are positioned at different distances from signal lines based on their specific locations and functions. The first touch line has a first spaced distance from the first signal line, while the second touch line has a second spaced distance from the first touch line, creating an asymmetric but optimized configuration that minimizes parasitic capacitance.
Data Source
AI summary
A transparent display device with a touch sensor is provided, which may minimize loss of light transmittance due to a touch sensor and a touch line, and may improve uniformity of parasitic capacitance between touch lines. The transparent display device with a touch sensor comprises a substrate provided with a transmissive area and a non-transmissive area, a touch sensor provided in the transmissive area over the substrate, including a touch sensor electrode, a pixel provided in the non-transmissive area over the substrate, including a plurality of light emitting elements comprised of an anode electrode, a light emitting layer and a cathode electrode, a first signal line extended from the non-transmissive area in a first direction, a first touch line provided between the first signal line and the transmissive area, and a second touch line provided between the first touch line and the transmissive area. The first touch line is disposed to have a first spaced distance from the first signal line, the second touch line is disposed to have a second spaced distance from the first touch line, and the first spaced distance may be greater than the second spaced distance.