Electromagnetic induction panel, electromagnetic induction device and driving method thereof
By employing a signal driving circuit with differential positive and negative driving signals in the electromagnetic induction device, the driving signal is selectively applied according to the position of the electromagnetic pen, thus solving the problem of weak sensing signal at the edge of the antenna plate and achieving high-precision position recognition and low-power electromagnetic pen positioning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-24
AI Technical Summary
In existing electromagnetic handwriting devices, the electromagnetic pen receives a weak signal when it is at the edge of the antenna plate, making it impossible to accurately determine the pen's position. This is especially true on flexible multi-layer integrated touch display panels, where the signal-to-noise ratio of the sensing signal at the edge is insufficient, affecting the accuracy of position recognition.
The signal driving circuit employs differential positive and negative driving signals. Through a combination of signal amplifiers and switches, positive and negative driving signals are selectively applied according to the position of the electromagnetic pen, thereby increasing the intensity of the induced signal at the edge position. An edge driving mode is also used at the edge position to improve the signal-to-noise ratio.
The electromagnetic pen's sensing signal strength and signal-to-noise ratio at the edge of the antenna board were improved, enhancing position recognition accuracy and reducing the power consumption of high-voltage signal drive, thus meeting the position recognition accuracy requirement of 0.3–0.5 mm.
Smart Images
Figure CN120949963B_ABST