Display Source Amplifier Proximity Sensing With Shared Electrodes
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Solution Overview
Problem
Existing input devices face challenges in accurately detecting proximity and motion of input objects within a sensing region, particularly in providing efficient and cost-effective solutions for proximity sensing in electronic systems.
Innovation Solution
A processing system comprising a first source amplifier and an analog front end, connected to a display panel's sensor electrode, generates drive signals based on grayscale voltage and comparison output signals to perform proximity sensing, enabling efficient detection of input objects through capacitive sensing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional proximity sensing methods are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent combines the display pixel electrodes with proximity sensing electrodes, allowing the same electrode structure to serve both display and sensing functions. The source amplifier is also dual-purpose, handling both display drive signals and sensing signals, thereby integrating multiple functions into existing components rather than adding separate systems.
Solution Approach 2:
The pixel electrodes in the display panel are designed to serve dual purposes: driving display elements and detecting proximity signals. The source amplifier similarly performs multiple functions including generating drive signals for display and processing sensing signals for proximity detection, eliminating the need for dedicated separate components.
2Measurement precision
If separate proximity sensing components are added, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the proximity sensing electrode with the display pixel electrode, and combines the sensing signal processing function within the existing source amplifier circuitry. This integration approach achieves accurate proximity sensing without adding separate sensing components or increasing overall device complexity.
3Device complexity
If integrated sensing is implemented, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The integration of sensing and display functions uses the existing pixel electrode and source amplifier infrastructure, which are already precisely manufactured for display purposes. This approach leverages existing manufacturing precision rather than requiring additional precision, as the same high-precision components serve dual functions.
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 the accuracy and cost-effectiveness of proximity sensing, allowing for reliable detection of input objects and improved design flexibility in electronic systems.
Implementation Method 1
performing proximity sensing on the display panel based on the first comparison output signal
Data Source
AI summary
A processing system comprises a first source amplifier and an analog front end. The first source amplifier comprises a first input electrically connectable to a first sensor electrode of a display panel and configured to generate a first drive signal based on a first grayscale voltage corresponding to a first pixel data and generate a first comparison output signal based on a first sensing signal from the first sensor electrode and a reference voltage. The analog front end is configured to generate a first digital detection data used for proximity sensing based on the first comparison output signal outputted from the first source amplifier.