Integrated Touch Sensor Lines Under Planarization Layer
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Solution Overview
Problem
Existing display panels face challenges in integrating supplemental features like touch sensing, touch pressure sensing, and tactile feedback without compromising display quality, due to issues such as parasitic capacitance and complexity in layer operation.
Innovation Solution
A display panel configuration with segmented electrode blocks and a specific arrangement of common signal lines and touch link lines, allowing for both display and touch functionality to be integrated within the same panel, using a plurality of thin-film transistors and planarization layers to minimize thickness and weight while maintaining effective touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate touch panel is overlaid on the display panel to provide touch-sensing functionality, then touch-sensing capability is added, but the thickness and weight of the display panel increase
Solution Approach 1:
The patent merges the touch sensor components with the display panel by integrating touch-sensing lines and touch-driving lines into the same substrate structure. The touch sensor electrodes are formed within the display panel layers, specifically using the same substrate that contains the display pixels, thereby combining two previously separate components (display panel and touch panel) into a single integrated structure. This eliminates the need for a separate overlay panel, reducing both weight and thickness while maintaining touch-sensing functionality.
2Adaptability or versatility
If separate components or substrates are added to the display panel for supplemental features, then functionality is enhanced, but the thickness and weight increase
Solution Approach 1:
The patent embeds touch sensor components within the internal structure of the display panel substrate. The touch-sensing lines and touch-driving lines are nested within the same substrate that contains the display pixel circuitry. Specifically, the touch sensor electrodes are formed in the same substrate layer as the display electrodes, with the touch sensing functionality integrated into the internal architecture rather than added as an external overlay. This nesting approach maintains compact thickness while enhancing functionality.
3Adaptability or versatility
If conductive lines are added to transmit signals for touch-sensing functionality, then touch-sensing capability is provided, but unwanted parasitic capacitance is generated causing visual defects
Solution Approach 1:
The patent applies local quality by providing selective insulation between different conductive lines. Specifically, insulation layers are introduced between the touch-sensing lines and the display electrode lines in specific regions where parasitic capacitance would cause visual defects. The insulation is applied locally at critical interfaces rather than throughout the entire structure. This localized insulation approach allows signal transmission for touch sensing while preventing harmful capacitive coupling that would cause display defects such as irregular tilting angles and line dimming.
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 features are implemented with a plurality of conductive lines 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.