Touch-Integrated Display Ground-Line Compensation for EMI Cancellation
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Solution Overview
Problem
Display devices with large areas and high resolution experience increased electromagnetic interference (EMI) noise due to touch driving signals, which degrade image quality and touch performance.
Innovation Solution
A display device incorporating a compensation unit that generates an inverted signal to cancel noise using a ground voltage as a reference, with a display ground line and touch ground line surrounding the display area, and an inverting amplifier to detect and amplify noise differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display device is implemented as a touch-integrated display device with large area and high resolution, then the display quality and touch functionality are improved, but noise due to electromagnetic interference increases
Solution Approach 1:
The patent applies preliminary anti-action by generating an inverted signal that anticipates and counteracts the electromagnetic interference noise before it degrades the display quality and touch performance. The compensation unit creates a counter-phase signal that cancels out the noise through destructive interference, preventing the harmful effects rather than addressing them after they occur.
Solution Approach 2:
The patent converts the harmful electromagnetic interference noise into a beneficial effect by using the noise signal itself to generate the inverted compensation signal. The compensation unit extracts the noise component from the feedback signal and inverts it, transforming the harmful interference into a useful counter-signal that cancels the original noise, thereby converting a detrimental factor into a solution.
2Reliability
If multiple ground lines are used for display and touch driving, then the noise cancellation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The patent merges the display ground line and touch ground line into a unified compensation system. Both ground lines are connected to the same compensation unit that processes their combined feedback signals through a single inverting amplifier, creating a consolidated noise cancellation approach that reduces structural complexity while maintaining effectiveness for both display and touch operations.
Solution Approach 2:
The compensation unit is designed with universal functionality to handle both display and touch ground lines simultaneously. The single compensation unit and inverting amplifier serve multiple purposes by processing feedback from both ground lines and generating a unified inverted signal that cancels noise for both display driving and touch driving operations.
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
The solution effectively cancels noise generated during display and touch driving, improving image quality and touch performance by simplifying the device configuration and reducing electromagnetic interference.
Implementation Method 1
noise due to electromagnetic interference (EMI) increases
Implementation Method 2
output an inverted signal having an anti-phase of the feedback signal
Data Source
AI summary
A display device is disclosed that comprises: a display panel including a display area in which pixels and touch electrodes are disposed and a non-display area surrounding the display area; a ground line disposed in the non-display area and configured to apply a ground voltage to the display panel during display driving and touch driving; and a compensation unit configured to receive a feedback signal from the ground line and output an inverted signal having an anti-phase of the feedback signal to the ground line.