Display Sensor Electrode Phase Inversion for Interference Cancellation
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Solution Overview
Problem
Current display devices face challenges in achieving improved display quality due to interference between the display layer and sensor layer, which can lead to image quality degradation and electromagnetic interference.
Innovation Solution
The display device incorporates a sensor layer with specific electrode configurations and readout circuits that provide inverse phase transmission signals to minimize interference by ensuring that signals from the first and second sensing regions cancel each other out, thereby reducing electromagnetic interference and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor layer is added to enable touch sensing, then touch detection capability is improved, but electromagnetic interference and image quality degradation occur
Solution Approach 1:
The patent applies preliminary anti-action by providing inverse phase driving signals to adjacent transmission electrodes before interference can occur. The readout circuit generates fourth and eighth transmission signals with inverse phases to cancel out electromagnetic interference from neighboring electrodes, preventing harmful effects rather than addressing them after they occur.
Solution Approach 2:
The patent changes the phase parameter of transmission signals to resolve the contradiction. By alternating the phase of driving signals between adjacent transmission electrodes (e.g., fourth transmission signal has inverse phase to eighth transmission signal), the system maintains touch detection capability while eliminating electromagnetic interference that would otherwise degrade image quality.
2Area of stationary object
If transmission signals are provided to adjacent transmission electrodes, then sensing coverage is improved, but signal interference increases
Solution Approach 1:
The readout circuit preemptively generates inverse phase signals for adjacent transmission electrodes to counteract potential signal interference. When fourth transmission signal is provided to a first transmission electrode, the eighth transmission signal with inverse phase is simultaneously provided to an adjacent second transmission electrode, preventing interference before it affects sensing reliability.
Solution Approach 2:
The patent modifies the phase parameter of transmission signals to eliminate interference while maintaining comprehensive sensing coverage. By alternating phases between adjacent electrodes, the system achieves wide-area touch detection without the signal interference that would normally compromise measurement precision.
3Speed
If multiple transmission signals are provided concurrently to multiple electrodes, then detection speed is improved, but electromagnetic interference increases
Solution Approach 1:
The readout circuit simultaneously generates inverse phase signals for concurrently activated transmission electrodes. When multiple transmission signals are provided at the same time to enable fast detection, the system preemptively cancels their electromagnetic interference by providing corresponding inverse phase signals, allowing high-speed operation without harmful interference.
Solution Approach 2:
The patent changes the phase parameter of concurrently provided transmission signals to eliminate electromagnetic interference. By alternating phases between simultaneously activated electrodes, the system achieves fast touch detection speed while the vector sum of electromagnetic fields cancels out, preventing harmful interference.
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
This configuration results in a display device with improved detection reliability and display quality by reducing signal interference and electromagnetic interference, leading to enhanced sensitivity and image clarity.
Implementation Method 1
a sensor layer on the display layer and having a sensing region including a first sensing region and a second sensing region
Data Source
AI summary
A display device includes a display layer, and a sensor layer having a sensing region and a second sensing region. The sensor layer includes a plurality of first transmission electrodes and a plurality of second transmission electrodes, a first transmission signal having a first waveform and a second transmission signal having a second waveform are provided to the plurality of first transmission electrodes, a third transmission signal having the second waveform and a fourth transmission signal having the first waveform are provided to the plurality of second transmission electrodes, and the first to fourth transmission signals are provided concurrently.