Capacitive Sensor Position Detection with Noise Removal
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Solution Overview
Problem
Current portable electronic devices with integrated input and display panels face challenges in accurately detecting contact positions on capacitive sensors, particularly in distinguishing between contact and hovering states, due to variations in sensor detection values and noise interference.
Innovation Solution
An electronic apparatus comprising a sensor-equipped display device, a sensing circuit, and an application processor that utilizes multiple setting tables and sensor driving signals to generate three-dimensional information of contact positions, enabling precise detection and noise removal through synchronized control of the sensor and display driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a capacitive sensor is used to detect contact position on the display screen, then the input function is integrated with the display panel, but the detection accuracy deteriorates due to noise interference and difficulty in distinguishing contact from hovering states
Solution Approach 1:
The sensor detection values are segmented into multiple categories based on their magnitude ranges. The sensing circuit classifies detection values into different segments corresponding to contact states, hovering states, and noise, enabling differentiated processing and accurate state identification despite the integrated design
Solution Approach 2:
The patent introduces a new dimension of analysis by examining the distribution pattern and magnitude range of sensor detection values rather than relying on single-threshold detection. By analyzing the dimensional characteristics of detection value distributions across different states, the system achieves accurate differentiation between contact and hovering states
2Measurement precision
If multiple setting tables are used to control sensor driving signals, then detection sensitivity is improved, but device complexity increases
Solution Approach 1:
The display driver is designed to perform multiple functions: it not only drives the display panel but also generates sensor driving signals and processes sensor detection values. By making the display driver universal, the patent avoids adding separate dedicated circuits for sensor control, thereby improving detection sensitivity without proportionally increasing device complexity
Solution Approach 2:
The patent merges the sensor driving signal generation and detection value processing functions into the existing display driver circuit. By combining these functions with the display driver's existing operations, the system achieves enhanced detection capability while minimizing the increase in overall device complexity
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 enhances detection accuracy and sensitivity, allowing for reliable contact and hovering detection, improving overall performance and usability of portable electronic devices.
Implementation Method 1
The input panel comprises, for example, a sensor which detects capacitance change
Data Source
AI summary
According to one embodiment, an electronic apparatus includes a sensor-equipped display device including a display device and a sensor which outputs information for detecting a contact position on the display device, a display driver which outputs a driving signal to the sensor based on one setting table, an application processor which outputs a table selection signal specifying a setting table and a sensor setting signal specifying a driving method of the sensor to the display driver, and a sensing circuit which outputs a dataset including three-dimensional information of a coordinate of a position on the display device and a physical quantity at the coordinate to the application processor, and outputs a table selection request signal generated based on the table selection signal, and a control signal which controls driving timing of the sensor to the display driver, the control signal having generated based on the sensor setting signal.