Touch Control Chip Reset Packets for Finger-Palm Transitions
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Solution Overview
Problem
Existing electronic devices struggle to accurately differentiate between finger and palm inputs on touch pads, leading to unintended operations such as 'Finger→Palm→Finger', which are not recognized by the post-operation system.
Innovation Solution
A control chip that actively generates reset report packets to segment 'Finger→Palm→Finger' operations into 'Finger→Palm' and 'Palm→Finger', using detection signals to identify object types and send report packets with specific codes indicating leaving or non-leaving states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch sensing device continuously sends report packets at a fixed report period, then the system maintains consistent reporting frequency, but it cannot accurately represent object type transitions (Finger→Palm→Finger) causing false operations
Solution Approach 1:
The control chip performs preliminary detection of object type changes between consecutive report packets. When a transition from finger to palm is detected, the system proactively generates a reset report packet before the next scheduled report, ensuring the system state is properly reset to accommodate the subsequent finger operation. This preliminary detection and intervention prevents false operations caused by continuous reporting without state awareness.
2Reliability
If the control chip sends a reset report packet indicating object leaving when object type changes, then the successive operation can be segmented, but it falsely indicates the object left the sensing surface when it actually didn't
Solution Approach 1:
The reset report packet segments the continuous touch operation into distinct phases by introducing a logical break point. When object type changes from finger to palm, the reset packet divides the operation sequence, allowing the system to treat the subsequent finger operation as a new independent event rather than a continuation. This segmentation enables accurate recognition of Finger→Palm→Finger sequences without requiring the object to physically leave the sensing surface.
3Ease of operation
If the system treats Finger→Palm→Finger as a continuous operation, then reporting is simple, but the post operation system cannot recognize the successive operation pattern leading to false operations
Solution Approach 1:
The control chip monitors object type changes and provides feedback by generating reset report packets when transitions occur. This feedback mechanism informs the post operation system of significant state changes (finger to palm), enabling the system to properly interpret successive operations. The feedback loop ensures that Finger→Palm→Finger sequences are recognized as intentional user actions rather than false operations, maintaining both reporting simplicity and operational reliability.
Data Source
AI summary
The present disclosure provides an electronic device including a touch sensing device, a control chip and a post operation system. The touch sensing device is used to output a detection signal associated with an object. The control chip is used to identify a contact area, a contact position, an operation status of the object according to the detection signal to send a corresponding report packet to the post operation system. When identifying that the contact area changes from a small area to a large area, the control chip actively sends a reset report packet to reset a current operation status to an initial contact.