Display Input Sensor Dual-Mode Proximity Sensing for Lower Power
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Solution Overview
Problem
Existing multimedia display devices lack efficient integration of both touch and proximity sensing functions, leading to suboptimal user interaction and energy consumption.
Innovation Solution
A display device incorporating a sensor layer with first and second electrodes and a sensor driver that operates in dual proximity sensing modes, utilizing varying voltage levels for enhanced object detection and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission signals with high voltage levels are continuously applied to all electrodes for proximity sensing, then sensing accuracy is improved, but energy consumption increases
Solution Approach 1:
The electrode array is divided into multiple groups that are activated selectively based on proximity detection needs. Instead of continuously driving all electrodes, the sensor driver activates only specific electrode groups in specific time slots, segmenting the sensing operation to reduce overall energy consumption while maintaining detection accuracy where needed.
Solution Approach 2:
The sensor driver implements periodic scanning of electrode groups rather than continuous activation. Transmission signals are applied in alternating time slots to different electrode groups, creating a periodic sensing pattern that reduces average power consumption while maintaining the ability to detect proximity events across the entire sensor area.
2Use of energy by moving object
If dual proximity sensing modes with different voltage levels are implemented, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The sensor driver dynamically switches between two operational modes: a first proximity sensing mode using higher voltage transmission signals for enhanced detection sensitivity, and a second proximity sensing mode using lower voltage signals for energy-saving operation. This dynamic adaptation allows the system to optimize the balance between sensing performance and power consumption based on actual operational requirements.
Solution Approach 2:
The system changes the voltage level parameter of transmission signals based on operational mode. In the first proximity sensing mode, transmission signals use a first voltage level with higher amplitude for improved sensing accuracy. In the second mode, transmission signals use a second voltage level with lower amplitude to reduce power consumption. The sensor driver selectively applies different voltage levels to electrodes based on the current operational mode.
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
Enables accurate touch and proximity sensing with reduced energy consumption by selectively driving electrodes, improving user interaction and device efficiency.
Implementation Method 1
a sensor layer including a plurality of first electrodes and a plurality of second electrodes; and a sensor driver that selectively operates in a first proximity sensing mode and a second proximity sensing mode
Data Source
AI summary
An input sensor of a display device includes a plurality of first electrodes, a plurality of second electrodes crossing the plurality of first electrodes, and a sensor driver selectively operating in a first proximity sensing mode and a second proximity sensing mode. The sensor driver outputs a plurality of transmission signals to the plurality of first electrodes and receives sensing signals from the plurality of second electrodes. The plurality of transmission signals includes a signal swinging between a first high level and a first low level during the first proximity sensing mode. The plurality of transmission signals is a signal swinging between a second high level and a second low level during a second proximity sensing mode. The second high level is a voltage level greater than the first high level.