Input Sensing Unit Capacitance Deviation Reduction
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Solution Overview
Problem
Display devices face issues with detection accuracy and touch sensitivity due to capacitance deviations caused by noise from abnormal capacitances in input sensing units, which are not effectively addressed by existing technologies.
Innovation Solution
The input sensing unit is designed with specific electrode and sensing line configurations, including first and second electrodes arranged in a column direction, connected to pad portions in a way that minimizes capacitance deviations by optimizing the placement of sensing lines and pads, thereby reducing noise and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing lines are disposed in a non-sensing region surrounding the sensing region, then the input sensing unit can recognize touch events, but capacitance deviations occur due to abnormal capacitances between sensing electrodes and sensing lines, degrading detection accuracy and touch sensitivity
Solution Approach 1:
The patent extracts and removes the problematic sensing lines from the non-sensing region where they cause abnormal capacitances. By eliminating the sensing lines that extend beyond the sensing region, the source of capacitance deviation is removed, thereby improving detection accuracy without compromising touch event recognition capability
Solution Approach 2:
The patent converts the harmful effect of sensing lines causing capacitance deviation into a benefit by strategically positioning pad portions. The pad portions are disposed between sensing electrodes and sensing lines to act as shielding structures, transforming the potential source of error into a protective element that reduces capacitance coupling and improves measurement precision
2Ease of operation
If multiple sensing lines connect sensing electrodes to pad portions, then the input sensing unit can function properly, but noise is generated due to difference between abnormal capacitances, reducing touch sensitivity
Solution Approach 1:
The patent introduces pad portions as intermediary structures between sensing electrodes and sensing lines. These pad portions serve as mediators that reduce direct coupling and minimize capacitance effects, thereby reducing noise generation while maintaining the functional connection between sensing electrodes and sensing lines for proper touch sensitivity
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 configuration significantly reduces capacitance deviations, enhancing the detection accuracy and touch sensitivity of the input sensing unit, leading to improved performance in recognizing touch interactions.
Implementation Method 1
Capacitances may be generated between the sensing electrode and the plurality of sensing lines, and the capacitances may change depending on positions of the sensing electrode and the sensing lines
Data Source
AI summary
An input sensing unit includes sensing electrodes. Each of the sensing electrodes includes: first electrodes arranged in a column extending in a first direction; a second electrode extending in the first direction; first sensing lines connected to the first electrodes, the first sensing lines extending in the first direction; and a second sensing line connected to the second electrode, the second sensing line extending in the first direction. The first sensing lines are connected to first pad portions. The second sensing line is connected to a second pad portion. The second pad portions or some of the first pad portions are disposed between a first pad portion among the first pad portions and the second pad portion, the first pad portion being connected to a first sensing line closest to the second sensing line among the first sensing lines.