Electrostatic Touch Input Reference Updating for Fast Wake Detection
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Solution Overview
Problem
Conventional touch panel controllers experience delays in detecting operation inputs when switching between low power consumption modes due to the lack of timely reference value updates, leading to delayed detection of operation positions.
Innovation Solution
The electrostatic input apparatus employs a sensor electrode, processor, and memory to perform switching control between regular and low power consumption modes, determining operation inputs by subtracting a reference value from an output value, updating the reference value intermittently in low power mode, and using the last updated reference value upon switching to the regular mode to quickly determine operation inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the touch panel controller performs a low power scan intermittently during rest period in second mode, then power consumption is reduced, but detection delay occurs when switching back to regular mode
Solution Approach 1:
The patent applies preliminary action by maintaining and updating reference values during the low power intermittent scan mode before switching back to regular mode. The controller continuously updates reference values for detection points even during intermittent scanning, so when switching back to regular mode, the reference values are already current and ready for immediate use, eliminating detection delay while preserving power savings
Solution Approach 2:
The patent implements feedback by comparing current scan data with stored reference values to detect touch inputs. During intermittent low power mode, the system continues to update reference values based on new scan data, creating a feedback loop that maintains detection accuracy. When returning to regular mode, this feedback mechanism ensures immediate detection capability without requiring a full reference value re-initialization sequence
2Measurement precision
If the touch panel controller performs full scan in regular mode, then detection accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent applies segmentation by dividing the touch detection surface into multiple detection points and lines that can be scanned independently. During low power mode, only selected lines are scanned intermittently while reference values for other points are maintained from previous scans. This segmentation allows the system to reduce power consumption by scanning only necessary portions while maintaining overall detection accuracy through the segmented reference value structure
Solution Approach 2:
The patent implements periodic action by performing intermittent scans of selected lines during low power mode rather than continuous full scans. The controller periodically updates reference values for detection points based on these intermittent scans, maintaining detection capability while reducing power consumption. When full detection is needed, the system can quickly perform a complete scan to refresh all reference values
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 allows for rapid detection of operation inputs upon mode transition, reducing power consumption and minimizing delays in detecting operation positions.
Implementation Method 1
a sensor electrode 121 configured to perform input detection
Implementation Method 2
an output value of the sensor electrode 121; determining presence/absence of an operation input based on a difference value obtained by subtracting a reference value from an output value of the sensor electrode 121
Data Source
AI summary
An electrostatic input apparatus includes a sensor electrode configured to perform input detection; a processor; and a memory that includes instructions, which when executed, cause the processor to execute performing switching control between a regular mode and a low power consumption mode, and determining presence/absence of an operation input based on a difference value obtained by subtracting a reference value from an output value of the sensor electrode; updating the reference value based on the output value in an intermittent operation in the low power consumption mode; and in a first determination of first determining the presence/absence of the operation input after switching from the low power consumption mode to the regular mode, determining the presence/absence by using the output value first acquired in the first determination of the presence/absence of the operation input and the reference value last updated in the low power consumption mode.