Touch Sensing Unit Curved Edge Capacitance Compensation
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Solution Overview
Problem
The reduction in bezel area and the corner round shape of display screens lead to a decrease in the sensing area of touch sensing units, resulting in a decrease in touch detection power, especially at the bottom edge.
Innovation Solution
A touch sensing unit with edges having curved portions, featuring a touch sensor area and a touch peripheral area, includes a first touch conductive layer, a first touch insulating layer, and a second touch conductive layer. The touch sensor area has first and second touch sensor areas, with cap compensation patterns and extension patterns to compensate for the reduced capacitance due to the curved edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bezel area is reduced and corner round shape is applied to meet aesthetic and design requirements, then the appearance quality and adaptability are improved, but the sensing area of touch electrodes decreases leading to reduced touch detection power
Solution Approach 1:
The patent applies different patterns (cap compensation patterns and extension patterns) to different regions of the touch electrode structure. Specifically, cap compensation patterns are positioned at curved edge regions where capacitance loss occurs, while extension patterns extend the electrode area in straight edge regions. This localized differentiation compensates for the non-uniform capacitance distribution caused by corner rounding, maintaining touch detection power while preserving the aesthetic corner round design.
2Device complexity
If the sensing area of touch electrodes is reduced due to corner round shape, then the device complexity is reduced, but the touch detection power decreases
Solution Approach 1:
The touch electrode structure is segmented into multiple functional components: base touch electrodes, cap compensation patterns positioned at specific regions, and extension patterns extending from electrode ends. This segmentation allows each component to perform its specific function - the cap compensation patterns compensate for capacitance loss at curved edges while extension patterns maintain sensing area at straight edges, collectively preserving touch detection power without requiring complete redesign of the entire electrode system.
3Power
If cap compensation patterns and extension patterns are added to compensate for reduced capacitance, then the touch detection power is maintained, but the device complexity increases
Solution Approach 1:
The cap compensation patterns and extension patterns are integrated into the same conductive layer as the base touch electrodes, forming a unified multi-functional electrode structure. This merging approach allows all patterns to be manufactured simultaneously in one fabrication process, sharing the same material layer and processing steps, thereby minimizing additional manufacturing complexity while achieving the goal of maintaining touch detection power through capacitance compensation.
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
The solution effectively prevents a decrease in touch detection power by maintaining the sensing area and compensating for the reduced capacitance at the curved edges, ensuring consistent touch detection performance.
Implementation Method 1
a decrease in charge rate may occur due to a decrease in sensing area at the bottom edge of the touch sensing unit, which may lead to a decrease in touch detection power
Data Source
AI summary
A display device including a touch sensing unit including a first touch conductive layer, a first touch insulating layer disposed on the first touch conductive layer, and a second touch conductive layer disposed on the first touch insulating layer. The touch sensor area includes a first touch sensor area located at a center of the touch sensor area, and a second touch sensor area located between the first touch sensor area and the curved portion. The first touch conductive layer includes a touch connection electrode connecting adjacent first touch electrodes, and a plurality of capacitance (cap) compensation patterns arranged in the second touch sensor area. The plurality of cap compensation patterns includes a first cap compensation pattern electrically connected to the adjacent first touch electrode and a second cap compensation pattern electrically connected to the adjacent second touch electrode.