Display Panel Timing for Interference-Free Electromagnetic Touch
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Solution Overview
Problem
Conventional touch screens with integrated electromagnetic and display scanning face interference issues, leading to low reliability and report rates of the electromagnetic touch function due to overlapping frequency bands, which reduces the accuracy and effectiveness of electromagnetic touch scanning.
Innovation Solution
A display panel design that splits the electromagnetic touch scanning signal into multiple sub-blanking time periods within frame periods, allowing the electromagnetic touch drive circuit to provide electromagnetic touch scanning signals during these intervals, thereby avoiding interference with display signals and increasing the report rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic touch scanning is performed during field blanking time period only, then interference with display signal is avoided, but electromagnetic touch report rate becomes less than or equal to display refresh rate
Solution Approach 1:
The frame period is divided into multiple sub-periods, each containing a sub-charging time period and a sub-blanking time period. The electromagnetic touch scanning is performed during multiple sub-blanking time periods within a single frame period, rather than using only the field blanking time period. This segmentation allows multiple touch scanning operations to be completed within one frame, thereby increasing the report rate while avoiding display signal interference.
2Adaptability or versatility
If display scanning and electromagnetic touch scanning frequency bands overlap, then integrated design is achieved, but signal interference occurs resulting in inaccurate touch sampling
Solution Approach 1:
The patent implements periodic action by alternating between display scanning and electromagnetic touch scanning in a structured time-division manner. During sub-charging time periods, display scanning is performed; during sub-blanking time periods, electromagnetic touch scanning is performed. This periodic alternation allows both functions to coexist in an integrated design while avoiding frequency band interference, thereby maintaining both adaptability and measurement precision.
Data Source
AI summary
The present disclosure provides a display panel and a driving method thereof, and an electronic terminal. The display panel includes a drive circuit. The drive circuit includes a timing circuit configured to provide a frame synchronization signal having a frame period (including a plurality of sub-periods). Each sub-period includes a sub-charging time period and a sub-blanking time period. In a first type of frame period, a gate drive circuit and an electromagnetic touch drive circuit in the drive circuit are respectively configured to provide a display pulse during the sub-charging time period and provide an electromagnetic touch scanning signal during the sub-blanking time period.