NFC Polling Power Control to Reduce Display Interference
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Solution Overview
Problem
Operation of a near-field communication (NFC) antenna in proximity to a display panel can affect the display performance, causing visual artifacts such as flickering or ghosting due to electromagnetic interference.
Innovation Solution
Implementing a hybrid power control mechanism for the NFC antenna, alternating between reduced and increased power levels during specific time periods to mitigate display interference while maintaining effective NFC operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the NFC antenna operates at high power level continuously, then NFC communication effectiveness is improved, but display performance deteriorates due to electromagnetic interference causing visual artifacts
Solution Approach 1:
The patent implements periodic alternation between high power level (for effective NFC communication) and low power level (for reduced display interference). The controller switches the NFC antenna between these power states in a repeating cycle, allowing the system to achieve both reliable NFC operation and acceptable display performance by limiting the duration of high-power emission.
Solution Approach 2:
The patent makes the NFC antenna power level dynamic rather than static. The controller adjusts the power level between high and low states based on timing requirements, creating a variable power profile that adapts to the dual requirements of NFC communication effectiveness and display interference mitigation.
2Object-affected harmful factors
If the NFC antenna operates at low power level to reduce display interference, then display performance is improved, but NFC communication effectiveness deteriorates
Solution Approach 1:
The system uses periodic high-power bursts interspersed with low-power intervals. During the high-power phases, NFC communication effectiveness is maintained; during low-power phases, display interference is reduced. This periodic switching allows both contradictory requirements to be satisfied at different times within the same operational cycle.
Solution Approach 2:
The patent changes the power level parameter of the NFC antenna between two distinct states (high and low). By dynamically adjusting this parameter over time, the system optimizes NFC communication during high-power states and minimizes display interference during low-power states, resolving the contradiction between these two performance metrics.
3Reliability
If hybrid power control alternating between high and low power levels is implemented, then both display and NFC performance are balanced, but control complexity increases
Solution Approach 1:
The controller implements a periodic power control scheme with predetermined high and low power phases. This regular, repeating pattern simplifies the control logic compared to adaptive or feedback-based approaches, as the timing and power levels can be pre-programmed without requiring complex real-time decision-making or additional sensors.
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
Reduces visual artifacts on the display by minimizing electromagnetic interference during low-power periods and ensures adequate NFC performance during high-power intervals, balancing display and NFC performance.
Implementation Method 1
transmitting, from the short-range wireless communication assembly, a first polling signal according to a first power level during a polling sub-period
Implementation Method 2
controlling a short-range wireless communication assembly during a sequence of time periods by transmitting signals according to different power levels during different time periods
Data Source
AI summary
A method includes: controlling a short-range wireless communication assembly of a computing device during a sequence of time periods, each time period having a polling sub-period, by: during a first time period in the sequence: transmitting, from the short-range wireless communication assembly, a first polling signal according to a first power level during a polling sub-period of the first time period; and during a second time period of the sequence: transmitting, from the short-range wireless communication assembly, a second polling signal according to a second power level during a polling sub-period of the second time period.