Display Phase Modulation for Interference Mitigation
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Solution Overview
Problem
Electronic device displays, such as OLED and LCDs, are susceptible to electromagnetic interference from internal and external devices, leading to undesirable visible artifacts due to shared operating frequencies, which is difficult to mitigate by simply selecting non-interfering frequencies as devices become more complex and interact with external devices.
Innovation Solution
Implementing a modified timing for the display and interfering devices, including phase changes in the refresh rate of the display and operating frequency of interfering devices, to prevent or reduce visible interference, such as using phase shifts or varying phase charging signals during specific times like vertical blanking periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic interference mitigation is attempted by selecting non-interfering frequencies, then visible artifacts can be reduced, but device complexity increases and frequency selection becomes difficult as devices become more complex and interact with more external devices
Solution Approach 1:
The patent changes the timing parameters of display frame updates and interfering device operations to different phases. By offsetting the timing of display refresh cycles from the operating cycles of interfering devices (such as wireless charging coils or Bluetooth modules), the interference patterns fall between displayed frames and are not visible to users, thus mitigating artifacts without adding hardware complexity
Solution Approach 2:
The patent implements dynamic timing adjustment where the display controller dynamically modifies frame update timing based on detected interference patterns. The system can adjust the phase offset of display refresh cycles in real-time to optimize interference mitigation, creating a adaptive solution that responds to changing operational conditions without requiring complex hardware modifications
2Object-affected harmful factors
If display frame timing is modified to mitigate interference, then visible artifacts are reduced, but display performance and timing precision may be affected
Solution Approach 1:
The patent employs periodic display frame updates with carefully selected timing phases. By updating display frames at regular intervals that are phase-offset from interfering device operations, the system ensures that interference occurs during non-display periods. This periodic approach maintains consistent timing precision while effectively pushing interference into invisible intervals between frames
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
Effectively mitigates visible artifacts on the display by averaging out distortion patterns caused by interference signals, ensuring clear display performance even in complex device environments.
Implementation Method 1
adjusting a phase of each of the plurality of display frames, based on the identified interference signal, to generate changing distortion patterns in the plurality of display frames
Implementation Method 2
electromagnetic interference from other modules within the electronic device or from external devices can cause undesirable visible artifacts
Data Source
AI summary
Aspects of the subject technology relate to electronic devices with displays. A display may include an array of display pixels and control circuitry for operating the display. In some scenarios, interference signals from other components of the electronic device or additional external devices can couple to the control circuitry for the display and cause distortions in displayed data. Display frames may be displayed by an electronic device display with a varying phase. The varying phase display frames may each include a distortion pattern that also varies from frame to frame due to the varying phase. The varying distortion patterns may average out or visibly cancel when viewed by a user such that no visible artifact of the interference signal is seen by the user. The varying phase can be actively tuned to the interference signal if desired.