Touch Panel Electrode Segmentation for Sleep Mode Gesture Detection
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Solution Overview
Problem
Display devices with integrated touch panels often experience high power consumption when performing gesture detection in sleep mode due to the shared use of common electrodes for both display and touch detection functions.
Innovation Solution
A display device with a touch detection function that includes a display panel and a touch panel, where the touch panel has first electrodes extending in one direction and second electrodes intersecting with the first electrodes, and a processing unit that controls the device to shift from sleep mode to normal operation mode based on predetermined gesture patterns detected during touch detection periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mutual-capacitive touch detection is performed in sleep mode using shared common electrodes, then gesture detection function is available, but power consumption increases
Solution Approach 1:
The patent divides the touch detection function into two separate electrode systems: first electrodes dedicated to touch detection and second electrodes dedicated to display common electrodes. This segmentation allows the touch detection system to operate independently without requiring the display common electrodes, thereby enabling gesture detection in sleep mode with reduced power consumption since the display backlight and other high-power components can be turned off.
Solution Approach 2:
The first electrodes are designed to serve exclusively for touch detection purposes, while the second electrodes serve for display common potential. This multi-functionality assignment ensures that touch detection can be performed using only the first electrodes in sleep mode, avoiding the need to activate the entire display system and thus reducing overall power consumption while maintaining gesture detection capability.
2Measurement precision
If continuous mutual-capacitive touch detection is performed, then accurate gesture detection is achieved, but power consumption increases
Solution Approach 1:
The patent implements periodic touch detection by applying drive signals to the first and second electrodes at predetermined intervals rather than continuously. This periodic action maintains sufficient gesture detection accuracy by sampling touch events at regular intervals while significantly reducing power consumption compared to continuous detection, as the electrodes and associated circuitry remain inactive between detection cycles.
3Device complexity
If first electrodes and second electrodes are used for both display and touch detection, then device complexity is reduced, but power consumption increases in sleep mode
Solution Approach 1:
The patent segments the electrode functions by providing separate first electrodes for touch detection and second electrodes for display common potential. This segmentation increases device complexity slightly in terms of electrode structure but resolves the power consumption issue by allowing independent operation of touch detection without activating the display system in sleep mode.
Solution Approach 2:
The patent implements dynamic operation modes where the first and second electrodes can be activated independently based on the operational state. In sleep mode, only the first electrodes are activated for touch detection while the second electrodes remain inactive, allowing the system to adapt its power consumption dynamically based on whether display or touch detection is needed.
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 configuration reduces power consumption by using self-capacitive touch detection in sleep mode and mutual-capacitive touch detection in normal mode, allowing for accurate gesture detection without continuous mutual-capacitive touch detection between drive and touch detection electrodes.
Implementation Method 1
capacitive touch panel technology... detect a touch coordinate position and a gesture using a mutual-capacitive technology... detect touch input based on change in voltage of the first electrodes and change in voltage of the second electrodes
Data Source
AI summary
According to an aspect, a display device with a touch detection function includes a display panel and a touch panel. The touch panel includes first electrodes extending in one direction. The display panel includes second electrodes interesting with the first electrodes in planar view and serving as common electrodes that supply a common potential to pixels in a display area. The display panel also includes pixel signal lines and scanning signal lines interesting with each other in planar view. The pixel signal lines and the scanning signal lines are made into a floating state in a touch detection period in which a first drive signal is applied to the first electrodes, and a second drive signal is applied to the second electrodes at predetermined intervals to perform touch detection based on change in voltage of the first electrodes and change in voltage of the second electrodes.