Capacitive Touch Panel Mode Switching for Ambient Light Interference
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Solution Overview
Problem
Existing touch sensing systems are prone to light-induced errors due to ambient light interference, leading to inaccurate touch detection.
Innovation Solution
The touch sensor panel adjusts touch sensing operations based on detected lighting conditions, compensating for or discarding light-induced errors and transitioning to a less light-sensitive mode when necessary, utilizing integrated micro circuitry for optical sensing and touch/proximity sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch sensing is performed using fringing electric fields, then touch detection capability is improved, but light-induced errors increase due to ambient light interference
Solution Approach 1:
The touch sensor panel dynamically transitions between different touch sensing modes (first mode and second mode) based on detected lighting conditions. In bright ambient light, the system switches to a less light-sensitive mode, while in darker conditions it uses the more sensitive mode, thereby adapting to environmental conditions to maintain accuracy
Solution Approach 2:
The system changes operational parameters of the touch sensing by switching between different sensing modes that have different light sensitivity characteristics. This parameter change allows the system to optimize touch detection accuracy while minimizing the impact of ambient light interference
2Reliability
If the touch sensor panel uses a light-sensitive touch operation mode, then touch sensing sensitivity is improved, but light-induced touch errors increase
Solution Approach 1:
The system continuously monitors ambient light conditions and uses this feedback to determine when to switch between touch sensing modes. Based on the detected light level, the system automatically adjusts the operating mode to maintain reliable touch sensing while preventing light-induced errors
Solution Approach 2:
The touch sensor panel dynamically adapts its operating characteristics by switching between light-sensitive and less light-sensitive modes based on real-time environmental conditions, ensuring optimal performance across varying lighting scenarios
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 or minimizes light-induced touch errors by dynamically adjusting sensing operations, enhancing the accuracy and reliability of touch detection.
Implementation Method 1
integrated micro circuitry configurable for optical sensing and touch and/or proximity sensing
Implementation Method 2
In some capacitive-type touch sensing systems, fringing electric fields used to detect touch can extend beyond the surface of the display
Data Source
AI summary
A touch sensor panel can include a plurality of touch electrodes, one or more light detectors, a plurality of chiplets configurable for light sensing operation using the one or more light detectors or touch sensing operation using the plurality of touch electrodes, and processing circuitry coupled to the plurality of chiplets. The processing circuitry can be programmed to, in a first mode of touch sensing operation, in accordance with a determination that light detected by the one or more light detectors coupled to one or more first chiplets of the plurality of chiplets configured for the light sensing operation meets one or more first criteria, discard (or compensate) touch sensing results detected at the plurality of touch electrodes coupled to one or more second chiplets of the plurality of chiplets configured for the touch sensing operation.