NFC Control Device Timing for Display Panel
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Solution Overview
Problem
In display devices equipped with near-field communication (NFC) technology, the polling phase of the NFC controller often overlaps with the display phase, causing interference between the driving signal and the display signal, which results in a flashing or poor display defect.
Innovation Solution
A near-field communication control device is introduced, which includes a first receiving circuit to receive synchronization signals from the display control circuit and a driving circuit to output a driving signal to the NFC coil during the field blanking phase, avoiding interference with the display signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the NFC controller outputs driving signal to the NFC coil during the polling phase, then the NFC communication function is enabled, but the driving signal interferes with the display signal causing flashing or poor display defect
Solution Approach 1:
The patent segments the display period into effective display phase and field blanking phase, and the NFC control period into polling phase and monitoring phase. By aligning the polling phase with the field blanking phase temporally, the driving signal is segmented to be output only during periods when the display panel is not actively displaying images, thus avoiding interference while maintaining NFC functionality.
Solution Approach 2:
The patent implements periodic action by synchronizing the NFC control periods with the display periods. The polling phase of the NFC controller is periodically activated only during the field blanking phase of the display, creating a rhythmic pattern where NFC communication attempts occur at specific intervals that coincide with display refresh periods when no image data is being written to the panel.
2Productivity
If the display frequency is increased to improve display performance, then the display refresh rate is improved, but the interference between NFC driving signal and display signal becomes more severe
Solution Approach 1:
The patent introduces dynamic adaptability by making the NFC controller's operation dependent on the display panel's real-time state. The NFC controller dynamically adjusts its polling phase timing based on the field blanking phase timing of the display panel, allowing the system to adapt to different display frequencies and maintain synchronization regardless of the refresh rate, thus preventing interference even at high display frequencies.
Data Source
AI summary
The embodiments of the present disclosure provide a near-field communication control method, device, and display device. The near-field communication control device is applied to a display device. The display device includes a display panel, a near-field communication coil and a display control circuit, wherein the display panel includes a plurality of display periods, and each display period includes a field blanking phase and an effective display phase, the near-field communication control device includes: a first receiving circuit configured to receive a synchronization signal output from the display control circuit, wherein the display panel displays an image during the effective display phase under the control of the synchronization signal; and a driving circuit configured to output a driving signal to the near-field communication coil during the field blanking phase, according to the synchronization signal.