Touch Sensor Electrode Layout for Noise-Resistant Input
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Solution Overview
Problem
Existing electronic devices face challenges in achieving reliable touch input due to interference and noise in the sensing area, which affects the accuracy and responsiveness of touch-based inputs.
Innovation Solution
The electronic device incorporates a sensor layer with a sensing area divided into first and second areas, featuring electrodes and guard electrodes that receive different voltage levels, and a sensor driver that provides synchronized sensing signals, enhancing touch reliability by reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sensor layer with multiple electrodes is used to enable touch input, then touch-based input capability is provided, but interference and noise in the sensing area affect accuracy and responsiveness
Solution Approach 1:
The sensing area is divided into first and second areas with different electrode configurations. The first area has electrodes extending in a first direction, while the second area has electrodes extending in a second direction. This segmentation allows different regions to be optimized for different functions, improving overall touch reliability while maintaining input capability.
Solution Approach 2:
Guard electrodes are introduced as intermediary elements between the functional electrodes in the first and second areas. These guard electrodes receive different voltage levels and act as mediators to reduce interference and noise between adjacent sensing regions, thereby improving touch input reliability without sacrificing operational capability.
2Reliability
If guard electrodes with different voltage levels are introduced to reduce interference, then touch reliability is improved, but device complexity increases
Solution Approach 1:
The guard electrodes are integrated into the same sensor layer structure as the functional electrodes, sharing common conductive layers and insulation layers. This merging approach reduces the need for separate structural elements, thereby limiting the increase in device complexity while still achieving improved touch reliability through voltage-controlled interference reduction.
3Area of stationary object
If electrodes in different directions are used to expand sensing coverage, then sensing area is increased, but noise and interference between electrodes increase
Solution Approach 1:
Different regions of the sensing area are assigned different electrode orientations and guard electrode configurations. The first area uses electrodes extending in a first direction while the second area uses electrodes extending in a second direction. This local quality differentiation allows each region to be optimized for its specific function while guard electrodes locally manage interference between regions, enabling expanded sensing coverage without proportionally increasing noise.
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 improves touch reliability by minimizing noise and interference, resulting in more accurate and responsive touch-based input capabilities.
Implementation Method 1
an input sensor capable of providing a touch-based input manner that allows a user to input information or commands effectively and intuitively
Data Source
AI summary
Disclosed is an electronic device including a display layer, a sensor layer above the display layer, and defining a sensing area including a first area and a second area, and a sensor driver configured to drive the sensor layer, wherein the sensor layer includes a (1-1)th electrode in the first area, and extending in a first direction, a (2-1)th electrode in the first area, extending in a second direction crossing the first direction, and insulated from and crossing the (1-1)th electrode, a (1-2)th electrode in the second area, and extending in the second direction, a (2-2)th electrode in the second area,extending in the first direction, and insulated from and crossing the (1-2)th electrode, a first line connected to the (1-1)th electrode and to the (1-2)th electrode, a (2-1)th line connected to the (2-1)th electrode, and a (2-2)th line connected to the (2-2)th electrode.