Integrated Input Device Electrode Interference Mitigation
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Solution Overview
Problem
In shared electrode proximity sensor devices, display updating and input sensing often interfere, leading to inaccurate input sensing due to charge residual and leakage, especially when performed at different frequencies, making it difficult to determine baseline interference values.
Innovation Solution
The system employs a processing system that drives different sets of sensor electrodes during distinct sensing and display update periods, ensuring non-consecutive and non-overlapping periods to minimize interference, and scans electrodes in a pattern that maintains distance between display updating and input sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If display updating and input sensing are performed simultaneously during the same time periods on shared electrodes, then the amount of time available for performing both functions is increased, but display artifacts are generated and input sensing accuracy is negatively impacted
Solution Approach 1:
The patent segments the sensing operation into multiple sub-frames, where different sets of electrodes are driven for sensing during different time periods within the same display frame. This allows display updating and input sensing to occur in an interleaved manner, improving time utilization while maintaining sensing accuracy by avoiding simultaneous operation on the same electrodes.
Solution Approach 2:
The patent dynamically adjusts the timing and sequencing of electrode driving operations based on the specific configuration of sensor electrode sets and common electrodes. By flexibly organizing the driving sequence and timing, the system optimizes the balance between display updating and input sensing, ensuring that electrodes are not driven simultaneously for both functions.
2Measurement precision
If display updating and input sensing are performed during separate time periods, then interference between these processes is reduced, but charge remains on and leaks onto shared electrodes that have recently been driven for display updating, producing interference that negatively impacts input sensing accuracy
Solution Approach 1:
The patent applies preliminary discharge actions to electrodes before they are driven for input sensing. By discharging residual charge from electrodes that were recently used for display updating, the system eliminates charge leakage interference before sensing operations begin, thereby improving input sensing accuracy.
Solution Approach 2:
The patent implements periodic discharge cycles interspersed between display updating and sensing operations. This periodic action ensures that any residual charge is systematically removed at regular intervals, preventing accumulation and leakage that would interfere with sensing accuracy.
3Adaptability or versatility
If input sensing and display updating are performed at different frequencies, then the location of interference changes with each input sensing cycle, but this prevents baseline interference values from being determined
Solution Approach 1:
The patent segments the electrode sets into multiple groups that can be driven at different frequencies and time offsets. By organizing electrodes into distinct sets with different driving schedules, the system maintains consistent interference patterns for each set, enabling accurate baseline determination while still operating at flexible overall frequencies.
Solution Approach 2:
The patent applies different driving frequencies and timing characteristics to different local electrode sets rather than uniformly across all electrodes. This localized approach allows each electrode set to have optimized frequency characteristics that enable baseline interference determination, while the overall system maintains frequency flexibility.
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 approach reduces electrode interference, enhancing the accuracy of input sensing by preventing simultaneous driving of electrodes for display updating and input sensing, thus improving the overall performance of integrated input devices.
Implementation Method 1
an array of sensing elements 150... utilizing any combination of sensor components and sensing technologies, including capacitive sensing technologies
Implementation Method 2
utilizing any combination of sensor components and sensing technologies, including capacitive sensing technologies
Data Source
AI summary
Embodiments of the present invention generally provide an integrated input device. The integrated input device includes a plurality of sensor electrode sets including a plurality of common electrode sets, a plurality of gate electrodes, and a gate selector. A processing system is configured to drive the sensor electrode sets for capacitive sensing during a plurality of sensing periods and update display lines by driving the common electrode sets during display update periods. A sensor electrode of a first sensor electrode set that is driven last during a first sensing period and a sensor electrode of a second sensor electrode set that is driven first during a second sensing period are spatially non-sequential sensor electrodes. The first display update period, second display update period, and third display update period are non-consecutive and non-overlapping with the first sensing period, the second sensing period, and the third display update period, respectively.