Active Stylus Pen Tip Detection via Metallic Contacts
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Solution Overview
Problem
The existing active stylus systems face inefficiencies in transmitting replaceable pen tip information to a sensor controller due to limited communication range and low communication bit rate via capacitive coupling, leading to potential loss of information when the stylus is attached or detached.
Innovation Solution
The active stylus sends replaceable pen tip information in response to a pen lowering operation, allowing efficient transmission to the sensor controller, which then identifies the pen tip type and derives the stylus position based on the sent data signals using a method corresponding to the identified information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stylus repeatedly transmits replaceable pen tip information via capacitive coupling, then the information may eventually be received by the sensor controller, but the communication bit rate is low and communication resources are inefficiently utilized
Solution Approach 1:
The stylus detects the replaceable pen tip type in advance using metallic contacts before entering the sensor controller's detection range, and stores this information ready for transmission. This preliminary detection ensures the information is prepared beforehand, eliminating the need for repeated transmission attempts and improving communication efficiency.
Solution Approach 2:
The patent replaces the continuous repeated transmission approach with a trigger-based transmission system. The stylus transmits the replaceable pen tip information only when a specific trigger condition occurs (e.g., entering detection range, button press, or pen lowering operation), substituting the mechanical repeated transmission with an event-driven communication mechanism.
2Productivity
If the stylus transmits replaceable pen tip information only once upon attachment, then communication resources are efficiently utilized, but the information may not be received by the sensor controller due to limited communication range
Solution Approach 1:
The stylus performs preliminary detection of the replaceable pen tip type using metallic contacts before the actual writing operation begins. This ensures the information is ready and the stylus is properly configured before entering the communication range, improving the likelihood of successful single transmission.
Solution Approach 2:
The patent uses trigger conditions (entering detection range, button press, or pen lowering operation) to initiate information transmission, replacing the continuous or repeated transmission approach. This event-driven mechanism ensures transmission occurs at the optimal moment when communication is most likely to succeed.
3Reliability
If the stylus uses metallic contacts to detect replaceable pen tip type, then the detection is reliable, but the stylus structure becomes more complex
Solution Approach 1:
The patent combines the replaceable pen tip detection function with the existing metallic contacts used for electrical connection. The same metallic contacts serve dual purposes: establishing electrical connection and detecting the pen tip type through their arrangement or structure, thereby avoiding additional detection components and reducing overall complexity.
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 method ensures reliable and efficient transmission of replaceable pen tip information, improving communication efficiency and maintaining accurate stylus position derivation even when the stylus moves in and out of the sensor's detection range.
Implementation Method 1
one-way communication takes place in which signals are sent from the stylus and received by a sensor controller of the tablet
Implementation Method 2
the sensor controller receives the replaceable pen tip information and identifies the replaceable pen tip type of the active stylus
Data Source
AI summary
A method of using an active stylus and a sensor controller is provided including generally four steps. The active stylus, in response to a trigger indicative of a pen lowering operation, sends replaceable pen tip information indicating a type of a replaceable pen tip that forms a pen tip of the active stylus. The sensor controller receives the replaceable pen tip information and identifies the replaceable pen tip type of the active stylus. The active stylus repeatedly sends a data signal including a pen pressure value applied to the replaceable pen tip. The sensor controller derives a position of the active stylus based on the data signal using a position deriving method that corresponds to the replaceable pen tip information.