Input Sensing Circuit Pressure Detection via Sensor Segmentation
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Solution Overview
Problem
Current display devices with touch sensing capabilities face challenges in accurately distinguishing between touch inputs and pressure inputs, particularly in determining the intensity of pressure applied, which can lead to inaccurate sensing and user experience issues.
Innovation Solution
An input sensing circuit is designed with a pressure sensing part that includes a synthetic resin and conductive material, where first and second sensors are electrically connected or isolated based on the pressure applied, using indium tin oxide or indium zinc oxide, and a driver senses capacitance changes to determine pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a capacitive sensing technique is used to detect touch inputs, then the display device can sense user touch, but it cannot accurately distinguish between touch inputs and pressure inputs or determine pressure intensity
Solution Approach 1:
The sensing circuit is segmented into multiple independent sensor units arranged in a matrix pattern. Each sensor can independently detect pressure applied to its specific region, allowing the system to distinguish between touch and pressure inputs by analyzing the spatial distribution and magnitude of signals from different segments.
Solution Approach 2:
The same sensor structure and circuitry are used to detect both touch inputs and pressure inputs. The sensors can operate in multiple modes: detecting light touch events and measuring pressure intensity simultaneously, eliminating the need for separate sensing mechanisms and reducing overall device complexity.
2Loss of information
If multiple sensors are arranged in a matrix pattern with connection parts, then pressure can be detected at specific locations, but the device complexity increases due to additional connection parts and sensors
Solution Approach 1:
Adjacent sensors are electrically connected through connection parts to form combined sensing units. When pressure is applied, multiple connected sensors work together as a single sensing element, reducing the total number of independent sensors needed while maintaining the ability to detect pressure location and intensity through the combined signal.
Solution Approach 2:
The connection parts electrically connect adjacent sensors to create equipotential regions. This allows the system to treat multiple physical sensors as a single sensing zone, simplifying the electrical architecture while preserving spatial information about where pressure is applied within each equipotential region.
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 solution enables precise detection of pressure applied to the display device, improving user interaction by accurately distinguishing between touch and pressure inputs and enhancing the overall user experience.
Implementation Method 1
An input sensing driver is configured to sense a capacitance value between a first sensor of the plurality of first sensors and a second sensor of the plurality of second sensors
Data Source
AI summary
An input sensing circuit includes a base film. A plurality of first sensors are disposed on the base film. A plurality of second sensors are disposed on the base film. An input sensing driver is configured to sense a capacitance value between a first sensor of the plurality of first sensors and a second sensor of the plurality of second sensors. A pressure sensing part is in contact with the first sensor and the second sensor and includes a synthetic resin and a conductive material.