Touch Panel Staged Scanning for Power and Speed Trade-offs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch panel technologies face challenges in reducing power consumption and improving response speed and accuracy, especially when sensing external touch inputs in a display's deactivation mode, leading to increased computational burden and noise.
Innovation Solution
A method that involves performing a pre-scan in deactivation mode, followed by a high-speed fine scan to validate external touch inputs, and then a fine scan to confirm validity, with the display switching to activation mode upon subsequent touch detection, using electrode pads grouped into groups to reduce computational burden and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel continuously scans electrode pads to sense external touch input in deactivation mode, then touch sensing capability is improved, but power consumption and computational burden increase
Solution Approach 1:
The patent implements periodic scanning with variable frequencies based on operational mode. In deactivation mode, the touch controller performs scans at a first (lower) frequency, while in activation mode it switches to a second (higher) frequency, thereby reducing power consumption during low-activity periods while maintaining responsiveness when needed
Solution Approach 2:
The scanning frequency is made dynamic rather than static. The system automatically adjusts the scan frequency based on the display's operational state (deactivation vs. activation mode), optimizing the balance between touch sensing capability and power consumption in real-time
2Reliability
If the touch panel continuously scans electrode pads in deactivation mode, then external touch detection is improved, but response speed decreases
Solution Approach 1:
The system uses periodic scanning with mode-dependent frequencies. When the display is in deactivation mode, scans occur at a lower frequency sufficient for detecting wake-up touches. Upon detecting valid touch input, the system transitions to activation mode with higher frequency scanning, thereby improving response speed when rapid processing is needed
Solution Approach 2:
The touch controller incorporates feedback mechanisms to detect valid external touch input during periodic scans. When valid touch is detected in deactivation mode, the system triggers a mode transition to activation, which then employs higher frequency scanning to improve response speed for subsequent touch events
3Speed
If the touch panel scans electrode pads at high frequency to improve response speed, then response speed is improved, but power consumption increases
Solution Approach 1:
The scanning frequency is dynamically adjusted based on the display's operational mode rather than running at a constant high frequency. This dynamic adjustment allows the system to achieve high response speeds during activation mode while consuming less power during deactivation mode, resolving the trade-off between speed and energy usage
Solution Approach 2:
The system employs periodic scanning with two distinct frequency levels. High-frequency scanning is activated only when needed (during activation mode or upon valid touch detection), while lower-frequency scanning is used during deactivation mode, thereby achieving high response speed performance without the continuous power consumption penalty
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 effectively minimizes power consumption, enhances response speed and accuracy, and prevents malfunction by accurately determining touch validity through staged scanning processes, thereby improving user convenience and touch sensitivity.
Implementation Method 1
a capacitive overlay type touch panel has come into the spotlight... technology of sensing touch input even in a state in which a display is in a deactivation mode
Data Source
AI summary
A method of controlling a touch screen which includes electrode pads provided in response to a display is provided, the method includes: performing a pre-scan of scanning the electrode pads under a deactivation mode of the display; confirming a first touch input during the pre-scan; performing a high-speed fine scan of scanning the electrode pads with a fine high frequency that is higher than a frequency for the pre-scan; evaluating a touch validity of the first touch input of the pre-scan via the high-speed fine scan; performing a fine scan of scanning the electrode pads that is higher than the frequency for the pre-scan and lower than the frequency of the high-speed fine scan, when the touch validity of the first touch input is satisfied; sensing a second touch input during the fine scan; and changing the display into an activation mode in response to the second touch input.