Touch Sensor Electrode Segmentation for Signal Distortion Reduction
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Solution Overview
Problem
The integration of touch sensors with display devices, particularly OLEDs, poses challenges in maintaining image quality and achieving a narrow bezel design due to signal wiring interference and capacitance issues.
Innovation Solution
A display device configuration with a transparent substrate, circuit units, touch electrode rows, and touch wiring lines is implemented, where sub-touch electrodes and connection portions are designed to minimize parasitic capacitance and allow for efficient signal transmission, enabling a narrow bezel and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If touch sensor unit is integrated with display device, then distance between circuits is reduced, but signal distortion occurs due to capacitor in touch sensor unit
Solution Approach 1:
The patent extracts the problematic capacitor from the touch sensor unit by separating the touch electrode structure into distinct components: touch electrodes for signal sensing and connection portions for electrical connection. This extraction removes the parasitic capacitance that causes signal distortion while maintaining the integrated design benefits.
Solution Approach 2:
The touch electrode is segmented into multiple sub-touch electrodes with connection portions connecting them. This segmentation allows the signal transmission paths to be separated from the capacitive sensing areas, reducing parasitic capacitance effects on the signal while maintaining touch sensitivity.
2Adaptability or versatility
If signal wiring lines are disposed in rim of display device, then touch sensor unit can be integrated, but bezel width cannot be narrowed
Solution Approach 1:
The patent transitions from planar wiring arrangement to three-dimensional stacking by placing touch wiring lines on different layers (first wiring layer, second wiring layer) above the display device layers. This vertical arrangement in another dimension allows integration without increasing horizontal bezel width.
Solution Approach 2:
The touch sensor circuit components are nested within the display device structure by positioning touch electrodes, connection portions, and wiring lines in overlapping vertical arrangements. The touch wiring lines are nested above the display wiring lines, enabling integrated functionality within the same footprint.
3Ease of operation
If touch electrode rows are disposed at predetermined interval, then touch sensing is enabled, but parasitic capacitance increases
Solution Approach 1:
The patent applies different properties to different parts of the touch electrode structure: sub-touch electrodes have larger area for capacitive sensing, while connection portions have smaller area and are positioned to minimize overlap with wiring lines, reducing parasitic capacitance locally where it would be most harmful.
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 configuration effectively reduces signal distortion and allows for a narrower bezel design while maintaining image quality by optimizing touch sensor integration with display devices.
Implementation Method 1
when the touch sensor unit adopts an electrostatic capacity scheme, a signal transmitted to the display device may be distorted by a capacitor in the touch sensor unit
Data Source
AI summary
The present disclosure provides a display device including: a transparent substrate; a circuit unit disposed on the transparent substrate and comprising a plurality of circuit areas and a plurality of light-emitting areas respectively corresponding to the plurality of circuit areas; a plurality of touch electrode rows, one of the plurality of touch electrode rows comprising a plurality of sub-touch electrodes disposed to overlap the plurality of light-emitting areas and a plurality of first connection portions configured to connect the plurality of sub-touch electrodes in a first direction; and a touch wiring line extending in a second direction and configured to supply a touch signal to one sub-touch electrode of the plurality of touch electrode rows. A method of manufacturing the display device is also provided.