Touch Sensor Panel Palm Touch Rejection Control
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Solution Overview
Problem
Touch sensor panels often mistakenly register palm touches as valid inputs, leading to inaccurate input operations and user fatigue during tasks like drawing or writing, as they fail to effectively differentiate between intended stylus or finger touches and unintended palm contacts.
Innovation Solution
A control method and device for touch sensor panels that detect and exclude palm touches by analyzing touch information, determining valid touches that meet specific conditions such as touch shape, area, and pressure, and filtering out these contacts within predetermined time periods to prevent them from being displayed as inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch sensor panel registers all touches as valid inputs, then the input response is comprehensive, but false inputs from palm touches increase leading to inaccurate operations
Solution Approach 1:
The patent applies parameter changes by analyzing multiple touch characteristics simultaneously including touch area size, touch pressure force, touch duration time, and touch position coordinates. By setting dynamic thresholds for these parameters and comparing actual touch values against them, the system distinguishes between valid finger/stylus touches and invalid palm touches without requiring additional hardware sensors.
2Reliability
If the touch sensor panel filters out palm touches, then input accuracy improves, but the detection and processing time increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing threshold values for touch area, pressure, and duration that differentiate palm touches from valid touches. During actual touch operations, the system performs rapid comparison of current touch parameters against these pre-established thresholds, enabling fast discrimination without complex real-time computation.
Solution Approach 2:
The patent replaces complex mechanical or hardware-based palm rejection mechanisms with software-based parameter analysis. Instead of using additional sensors or complex hardware structures, the system uses computational analysis of electrical signal parameters from the existing touch sensor network to achieve palm touch discrimination.
3Adaptability or versatility
If the touch sensor panel uses simple touch detection, then the device complexity is low, but it cannot distinguish between valid touches and palm touches
Solution Approach 1:
The patent achieves multi-functionality by enabling the existing touch sensor panel to perform both basic touch detection and advanced palm touch rejection using the same hardware components. The system processes multiple parameters (area, pressure, duration, position) from the standard touch sensor network to simultaneously achieve comprehensive touch detection and intelligent touch classification without adding separate detection systems.
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 input accuracy and reduces user fatigue by effectively distinguishing and removing palm touches from valid inputs, ensuring only intended touches are registered, thereby improving the overall operation of touch sensor panels.
Implementation Method 1
obtaining touch information on the touch sensor panel from which an electrical signal outputted is changed according to a touch
Data Source
AI summary
A control method for a touch sensor panel is disclosed. The method includes obtaining touch information on the touch sensor panel from which an electrical signal outputted is changed according to a touch; detecting at least one valid touch from the touch information; determining that a valid touch of the at least one valid touch is included in a palm touch group by (a) detecting a palm touch (e.g., which meets a palm touch condition) among the at least one valid touch, and (b) determining valid touches (e.g., all valid touches) from a detection time of the palm touch to a predetermined backward tracking time; and non-displaying, on a display unit, the valid touch included in the palm touch group.