Sensor Driver Signal Frequency and Phase Adaptation
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Solution Overview
Problem
Existing electronic devices with proximity sensing functions face challenges in efficiently operating multiple sensing modes and reducing flicker noise in display layers.
Innovation Solution
The electronic device incorporates a sensor layer with a plurality of electrodes and a sensor driver that selectively operates in different modes, including a first mode for touch sensing and a second mode for proximity sensing, where the sensor driver can change the frequency or phase of transmission signals to reduce noise and improve sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor driver operates in multiple sensing modes (touch sensing and proximity sensing) with different transmission signals, then the sensing performance and functionality are improved, but the device complexity and control difficulty increase
Solution Approach 1:
The sensor driver dynamically switches between different driving modes (first driving mode for touch sensing, second driving mode for proximity sensing) based on operational requirements. The transmission signals are dynamically adjusted in frequency and phase according to the selected sensing mode, enabling adaptive operation without requiring separate dedicated circuits for each mode.
Solution Approach 2:
The sensor driver is designed as a multi-functional unit that can perform both touch sensing and proximity sensing operations using the same electrode structure. By configuring transmission signals with different frequencies and phases, the single sensor driver handles multiple sensing functions, reducing the need for separate dedicated drivers for each sensing mode.
2Object-affected harmful factors
If the sensor driver uses frequency hopping or phase changing transmission signals, then flicker noise is reduced and image quality is improved, but the signal complexity and processing requirements increase
Solution Approach 1:
The sensor driver employs periodic frequency hopping or phase changing of transmission signals at specific intervals. This periodic variation in signal characteristics reduces flicker noise by preventing continuous operation at a single frequency that could interfere with display refresh rates. The periodic action is implemented through controlled switching between different signal configurations.
Solution Approach 2:
The transmission signals have their frequency or phase parameters changed according to predetermined patterns or in response to detected conditions. By varying these signal parameters, the system reduces flicker noise and improves image quality without requiring fundamental changes to the hardware architecture, achieving noise reduction through parameter modulation.
3Measurement precision
If the sensor driver simultaneously outputs multiple transmission signals with different frequencies and phases, then proximity sensing accuracy is improved, but the energy consumption and power requirements increase
Solution Approach 1:
The sensor driver outputs multiple transmission signals with different frequencies and phases, but not continuously for all electrodes simultaneously. Instead, it selectively activates specific signal configurations based on the sensing mode and detected conditions, using partial action to maintain accuracy while reducing overall energy consumption compared to continuous full-signal operation.
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 enhances the electronic device's proximity sensing capabilities, reduces flicker noise, and improves image quality by allowing the sensor driver to adapt its operation based on specific events, such as changes in proximity or flicker detection.
Implementation Method 1
a sensor layer disposed on the display layer and including a plurality of first electrodes and a plurality of second electrodes
Data Source
AI summary
An electronic device includes a display layer configured to display an image, a sensor layer disposed on the display layer and including a plurality of first electrodes and a plurality of second electrodes, and a sensor driver configured to drive the sensor layer and selectively operate in a first mode or a second mode different from the first mode. When operating in the second mode, the sensor driver is configured to selectively operate in a first driving mode to simultaneously output a plurality of first transmission signals to the plurality of first electrodes or in a second driving mode to simultaneously output a plurality of second transmission signals different from the plurality of first transmission signals to the plurality of first electrodes.