Sensor Layer Uplink Signal Generation for Noisy Input Detection
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Solution Overview
Problem
Current electronic devices face challenges in accurately detecting active inputs, especially in noisy environments such as wireless charging, where traditional input detection methods may be disrupted by noise interference.
Innovation Solution
The electronic device incorporates a sensor driver that selectively uses different reference voltages to generate uplink signals, switching between a first reference voltage for passive inputs and a second, higher reference voltage for active inputs, ensuring reliable communication with input devices even in noisy conditions through a charge pump and DC/DC converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single reference voltage is used for uplink signal generation, then the device complexity is reduced, but the reliability of input detection deteriorates in noisy environments
Solution Approach 1:
The patent implements dynamic switching between two reference voltage levels (first reference voltage and second reference voltage) based on the operating mode. The sensor driver selectively uses different reference voltages for uplink signal generation depending on whether the device is in a normal operating mode or a wireless charging mode, allowing the system to adapt to different noise environments and maintain reliable input detection
Solution Approach 2:
The patent changes the reference voltage parameter from a fixed single value to a variable that can take on different levels. By switching between a first reference voltage (lower level) and a second reference voltage (higher level), the system optimizes the signal-to-noise ratio for uplink signals in different operating conditions, thereby improving detection reliability without requiring a completely separate voltage reference system
2Reliability
If a higher reference voltage is used for uplink signals, then the signal-to-noise ratio is improved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts the reference voltage level based on the operating mode. During normal operation, the lower first reference voltage is used to minimize power consumption. During wireless charging when noise interference is present, the system switches to the higher second reference voltage to maintain signal integrity, thus optimizing the balance between power consumption and signal quality in different operational contexts
Solution Approach 2:
The reference voltage parameter is changed from a constant value to a condition-dependent variable. The system monitors the operating mode and adjusts the reference voltage accordingly, using parameter changes to achieve optimal signal-to-noise ratio only when necessary, thereby avoiding continuous high power consumption while maintaining signal integrity in noisy environments
Data Source
AI summary
An electronic device includes: a display layer configured to display an image; a display driver configured to drive the display layer; a sensor layer on the display layer; and a sensor driver configured to drive the sensor layer, and wherein the sensor layer is configured to output a first uplink signal generated with a first reference voltage in a first mode, and to output a second uplink signal generated with a second reference voltage greater than the first reference voltage in a second mode different from the first mode.