Touch Module Layout Using Dual Pressure Sensors to Eliminate Blind Spots
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Solution Overview
Problem
Conventional touch modules with pressure sensing functions suffer from limited sensing area coverage, inconsistent weight sensing ranges, and installation challenges due to complex components, leading to sensing blind spots and reduced precision.
Innovation Solution
A touch module incorporating two types of pressure sensing elements with different sensing areas and weight ranges, arranged to overlap and cover the entire touch plane, with one type located at the center and the other at the edge, enhancing precision and coverage while minimizing interference and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single type of pressure sensing element is used, then the device complexity is reduced, but the sensing area coverage is incomplete and blind spots are created
Solution Approach 1:
The touch module divides the sensing area into multiple regions, each covered by different types of pressure sensing elements. The first pressure sensing element covers a first sensing area, the second pressure sensing element covers a second sensing area, and their overlap creates comprehensive coverage without requiring a single complex sensing element.
Solution Approach 2:
Different types of pressure sensing elements are deployed in different locations based on local sensing requirements. The first pressure sensing element is positioned for its optimal sensing characteristics, while the second pressure sensing element is positioned to cover areas where the first element is less effective, with their sensing areas overlapping in the central region.
2Area of stationary object
If pressure sensors are installed in complex component areas, then the sensing area is maximized, but the reliability of pressure sensors decreases due to interference and damage risks
Solution Approach 1:
The pressure sensing elements are extracted from the complex component area and positioned in optimized locations between the base plate and touch pad. This separation reduces interference from complex components and circuits while maintaining comprehensive sensing coverage through properly positioned sensing areas.
3Area of stationary object
If pressure sensors are positioned to cover all areas, then the sensing area coverage is improved, but the weight sensing precision decreases due to suboptimal positioning
Solution Approach 1:
Each pressure sensing element is positioned in its optimal location for maximum sensing precision. The first pressure sensing element is positioned where it provides best weight sensing accuracy, and the second pressure sensing element is positioned for its optimal performance, with their sensing areas overlapping to ensure comprehensive coverage without compromising individual precision.
4Device complexity
If a single pressure sensing element type is used, then the device structure is simplified, but the weight sensing range is limited
Solution Approach 1:
The touch module uses a composite sensing system combining two different types of pressure sensing elements with different weight sensing ranges. The first pressure sensing element handles its optimal weight range while the second pressure sensing element handles a different weight range, together providing an extended comprehensive weight sensing range while maintaining relatively simple individual component structures.
Data Source
AI summary
A touch module includes a base plate, a touch pad, a first pressure sensing element, a second pressure sensing element and a controller. The touch pad includes a first touch area, a second touch area and a third touch area. The first pressure sensing element and the second pressure sensing element are arranged between the base plate and the touch pad. When the first touch pressure area is pressed, the first pressure sensing element generates a first signal, and the controller generates a pressure signal according to the first signal. When the second touch pressure area, the second pressure sensing element generates a second signal, and the controller generates the pressure signal according to the second signal. When the third touch pressure area is pressed, the controller generates the pressure signal according to a result of comparing signal intensities of the first signal and the second signal.