Segmented Touch Electrodes on Display Substrate
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Solution Overview
Problem
Conventional electronic devices with displays face challenges in integrating supplemental features like touch sensing, touch pressure sensing, and tactile feedback without compromising display quality, as separate components add thickness and weight and can cause visual defects due to parasitic capacitance.
Innovation Solution
A display panel configuration with segmented electrode blocks and a planarization layer over common signal lines, allowing for touch sensing functionality without the need for additional substrates, reducing thickness and weight while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a discrete substrate with touch-driving lines and touch-sensing lines is overlaid on the display panel, then touch-sensing functionality is provided, but the thickness and weight of the display panel increase
Solution Approach 1:
The patent integrates the touch sensor substrate with the display panel substrate by forming both on a single substrate. The touch-driving lines and touch-sensing lines are formed directly on the display panel substrate alongside the pixel circuits, eliminating the need for a separate discrete touch panel overlay. This merging of substrates directly reduces the overall thickness while maintaining full touch-sensing functionality.
Solution Approach 2:
The display panel substrate serves dual purposes: it functions as both the display substrate housinging pixel circuits and as the touch sensor substrate containing touch-driving lines and touch-sensing lines. This multi-functionality allows a single substrate to provide both display and touch-sensing capabilities, thereby eliminating the need for additional substrates and reducing overall thickness.
2Adaptability or versatility
If a discrete substrate with touch-driving lines and touch-sensing lines is overlaid on the display panel, then touch-sensing functionality is provided, but the weight of the display panel increases
Solution Approach 1:
The patent merges the touch sensor substrate with the display panel substrate into a single integrated structure. By forming both the pixel circuits and the touch sensor elements (touch-driving lines and touch-sensing lines) on the same substrate, the patent eliminates the need for a separate discrete touch panel, thereby reducing the overall weight of the display assembly.
Solution Approach 2:
The single substrate is designed to perform multiple functions: it serves as the structural base for pixel circuits (display function) and simultaneously houses the touch-driving lines and touch-sensing lines (touch-sensing function). This multi-functionality reduces the total material required and thus decreases the overall weight compared to using separate substrates.
3Adaptability or versatility
If conductive lines are added for touch-sensing functionality, then touch sensing is enabled, but unwanted parasitic capacitance is generated causing visual defects
Solution Approach 1:
The patent extracts the touch sensor signal lines (touch-driving lines and touch-sensing lines) from the display signal path by assigning them to dedicated signal lines that are separate from the data lines and gate lines used for pixel control. This separation removes the source of parasitic capacitance interference between touch signals and display signals, preventing visual defects while maintaining touch-sensing functionality.
Solution Approach 2:
The patent implements localized shielding and routing strategies for the touch signal lines in specific regions where parasitic capacitance would be most problematic. By adjusting the local configuration of conductive lines, insulation layers, and grounding structures in critical areas, the patent reduces parasitic capacitance effects precisely where they would cause visual defects, while maintaining overall touch-sensing functionality.
Data Source
AI summary
A display of an electric device includes a plurality of separated transparent electrode blocks, which are configured to provide one or more of supplemental features such as touch recognition. Signal paths between the transparent electrode blocks and the driver for the supplemental feature are implemented with a plurality of conductive lines placed under positioned under one or more planarization layers. The conductive lines implementing the signal paths are routed across the display area, directly toward a non-display area where drive-integrated circuits are located.