Touch Control Structure with Bridge Electrodes for Lower Capacitance
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Solution Overview
Problem
Existing touch control structures for AMOLED displays face issues with high capacitance values and increased probability of short circuits due to large overlapping areas between touch driving and sensing electrodes, leading to poor touch performance and increased power consumption.
Innovation Solution
The design incorporates bridge electrodes with intersecting and symmetrical extension directions, reducing overlapping areas and using via structures for electrical connections, along with alternating arrangements of touch sub-electrodes and connection electrodes to minimize capacitance and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the overlapping area between touch driving electrode and sensing electrode is increased, then the touch sensitivity is improved, but the capacitance value increases and short circuit probability increases
Solution Approach 1:
The touch electrode structure is divided into multiple sub-electrodes (first touch sub-electrode, second touch sub-electrode, etc.) connected by bridge electrodes. This segmentation allows the electrodes to be distributed across a larger area, improving touch sensitivity while maintaining controlled capacitance values through the insulating layer separations.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the first metal layer (touch driving electrode) and the second metal layer (sensing electrode). This insulating layer prevents direct contact and short circuits between the electrodes while allowing capacitive coupling to function, thus resolving the contradiction between overlap area and short circuit probability.
2Reliability
If the bridge electrode extension direction is changed to intersect with adjacent bridge electrodes, then the capacitance value is reduced, but the structural complexity increases
Solution Approach 1:
The bridge electrodes are arranged with intersecting extension directions rather than parallel arrangements. Specifically, adjacent bridge electrodes in the middle area have intersecting extension directions, creating an asymmetric pattern that reduces overlapping capacitance areas while maintaining structural integrity through the insulating layer.
Solution Approach 2:
The bridge electrodes extend in different directions (first direction and second direction that are not parallel) to create a multi-dimensional arrangement pattern. This dimensional change allows the electrodes to be positioned to minimize overlapping capacitance while still forming connected touch electrode structures.
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 design reduces capacitance values, enhances signal noise ratio, and minimizes short circuit probabilities, thereby improving touch accuracy and reducing power consumption.
Implementation Method 1
each of the plurality of bridge electrodes is electrically connected with two adjacent first touch sub-electrodes through a plurality of via structures in the insulating layer
Data Source
AI summary
A touch control structure, a touch display panel and an electronic device are provided. The touch control structure includes: a first metal layer and a second metal layer stacked on the base substrate, an insulating layer between the first metal layer and the second metal layer, the first metal layer includes a plurality of first touch sub-electrodes arranged along a first direction and spaced apart from each other, a plurality of second touch sub-electrodes and a plurality of connection electrodes which are arranged along a second direction, the plurality of first touch sub-electrodes and the plurality of second touch sub-electrodes are spaced apart from each other; the second metal layer includes a plurality of bridge electrodes spaced apart from each other, each of the plurality of bridge electrodes is electrically connected with two adjacent first touch sub-electrodes through a plurality of via structures in the insulating layer.