Touch Control Chip Dynamic Uplink Signal Transmission
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Solution Overview
Problem
The transmission of uplink signals from a touch screen to a stylus is often affected by a user's hand, leading to reduced signal quality due to interference, as the hand can receive and ground the signal, altering the voltage and reducing the effective signal received by the stylus.
Innovation Solution
A method and apparatus that determine the sending mode of uplink signals based on detection of the user's hand and stylus proximity, adjusting the position, number, and timing of transmission channels to minimize interference, including all channels sending simultaneously, multiple groups sending sequentially, or a single channel near the stylus sending the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all transmission channels send the uplink signal simultaneously, then the signal transmission efficiency is improved, but the signal quality deteriorates when a user's hand approaches or touches the touch screen
Solution Approach 1:
The system dynamically adjusts the transmission channel selection based on the detected hand proximity state. When no hand is detected, all channels transmit simultaneously for high efficiency. When hand proximity is detected, the system switches to selecting only channels not covered by the hand's projection, thereby adapting the transmission mode to current conditions to maintain signal quality.
Solution Approach 2:
The system changes the parameter of transmission channel selection based on hand detection results. By calculating the projection area of the hand and identifying which channels are covered, the system modifies the set of active transmission channels from all channels to only those channels outside the hand's projection area, thus avoiding signal interference.
2Reliability
If multiple groups of transmission channels send the uplink signal in sequence, then the signal quality is improved when a user's hand approaches or touches the touch screen, but the signal transmission efficiency deteriorates
Solution Approach 1:
The transmission channels are segmented into multiple groups based on their spatial distribution on the touch screen. When hand proximity is detected, the system divides the channels and selects only specific groups that are not covered by the hand's projection, thereby segmenting the transmission to avoid interference while maintaining overall system functionality.
3Reliability
If the transmission channel position is adjusted to avoid the user's hand projection, then the signal quality is improved, but the device complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the detection electrodes continuously monitor hand proximity and provide information to the touch control chip. The chip calculates the hand's projection area and uses this feedback to dynamically adjust channel selection, creating a closed-loop system that automatically adapts to hand position without requiring complex manual intervention.
Data Source
AI summary
The present application provides a method of signal transmission, which can improve transmission performance of an uplink signal between a touch screen and a stylus. The method is performed by a touch control chip in an electronic device, a touch screen of the electronic device includes a transmission channel for sending an uplink signal to a stylus, and the method includes: detecting whether a user's hand and/or the stylus approaches or touches the touch screen; determining a sending mode of the uplink signal according to a detection result, where the transmission channel for sending the uplink signal in the touch screen is different in different sending modes.