Touch Sensor Electrode Width Variation for Sensitivity
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Solution Overview
Problem
Touch sensors face challenges in achieving reliable sensitivity across their entire sensing area while maintaining cost-effectiveness, as existing designs often require complex configurations and high manufacturing costs.
Innovation Solution
The design incorporates a plurality of first and second sensor electrode columns with varying widths and lengths, along with a pad unit connected by lines, where the second sensor electrodes have discrete widths and shapes that change based on distance from the pad unit, and the inclusion of dummy patterns in gray zones to balance the sensing area and reduce line density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex sensor electrode configurations are used to ensure reliable sensitivity across the entire sensing area, then touch sensitivity is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent applies local quality by making the width of second sensor electrodes vary along their longitudinal axis, with different width regions (first width, second width, third width) positioned at different locations. This creates localized capacitance variations that enhance touch sensitivity detection without requiring complex configurations across the entire sensor area, thus improving reliability while controlling device complexity.
2Ease of manufacture
If uniform sensor electrode widths are used across the sensing area, then manufacturing is simplified, but sensitivity detection capability is reduced
Solution Approach 1:
The patent applies parameter changes by varying the width parameter of second sensor electrodes along their longitudinal axis. The electrodes have different widths (first width, second width, third width) at different positions, which changes the capacitance parameters to enhance sensitivity detection. This maintains ease of manufacture through standard fabrication processes while achieving improved measurement precision through parameter variation.
3Measurement precision
If more sensor electrodes are added to improve sensitivity across the sensing area, then detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies local quality by strategically positioning sensor electrodes with specific width characteristics in different regions of the sensing area. Second sensor electrodes have varying widths (first width, second width, third width) at different locations, creating localized capacitance variations that enhance detection accuracy without requiring a uniform increase in the total number of electrodes, thus improving measurement precision while controlling manufacturing cost.
Solution Approach 2:
The patent applies parameter changes by varying the width parameter of second sensor electrodes along their longitudinal axis, creating different capacitance characteristics in different regions. This allows improved input detection accuracy through parameter variation rather than simply increasing the number of electrodes, thereby maintaining ease of manufacture while achieving enhanced measurement precision.
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 enhances touch sensitivity by varying capacitance detection across the sensing area, improving input detection accuracy while reducing manufacturing complexity and costs by simplifying the sensor structure.
Implementation Method 1
The first sensor electrodes and the second sensor electrodes may be disposed to intersect each other, along the column direction or row direction... A capacitance is formed between adjacent first and second sensor electrodes... The capacitance between the first sensor electrodes and the second sensor electrodes may be changed by a touch input
Data Source
AI summary
A touch sensor includes: a plurality of first sensor electrode columns disposed in a sensing area, the plurality of first sensor electrode columns each including one or more first sensor electrodes; a plurality of second sensor electrode columns alternately disposed with the first sensor electrode columns in the sensing area, the plurality of second sensor electrode columns each including a plurality of second sensor electrodes having a length defined by a longitudinal axis and a width extending in a direction across the length; and a plurality of lines connected to the first sensor electrode columns and the second sensor electrode columns. An outline length of at least some of the second sensor electrodes facing the first sensor electrodes varies along the longitudinal axis of its respective second sensor electrodes.