Dummy Gate Driver Clock Noise Cancellation
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Solution Overview
Problem
Noise from gate driver clocks interferes with touch functionality in electronic display panels, causing false positives and missed touches due to capacitive coupling with the substrate, leading to voltage fluctuations in the touch sensing layer.
Innovation Solution
Implementing a dummy gate driver clock that operates at an inverse voltage to cancel out fluctuations, or using dedicated gate driver clocks to partially cancel other gate driver clock fluctuations, and injecting inverse signals into the substrate or cathode layer to compensate for noise, while also turning off or inverting emission clocks during certain phases to reduce noise impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gate driver clock is used to drive pixels, then display operation is enabled, but voltage fluctuations occur in touch sensing layer causing false positives
Solution Approach 1:
The patent applies preliminary anti-action by generating an inverse gate driver clock signal that is specifically designed to counteract the voltage fluctuations caused by the normal gate driver clock. This inverse signal is applied in advance to the touch sensing layer to preemptively cancel out the harmful voltage fluctuations before they can cause false touch detections, thereby maintaining both display operation and touch sensing accuracy
2Reliability
If dummy gate driver clock is applied to substrate, then voltage fluctuations are reduced, but device complexity increases
Solution Approach 1:
The patent implements universality by designing the dummy gate driver clock circuit to serve multiple functions: it generates the inverse clock signal for noise cancellation, provides compensation signals to the touch sensing layer, and can be integrated with existing gate driver infrastructure. This multi-functional approach reduces the need for separate compensation circuits, thereby limiting the increase in device complexity while achieving reliable touch sensing
3Speed
If gate driver clock frequency is increased, then display refresh rate improves, but capacitive coupling noise increases
Solution Approach 1:
The patent applies blessing in disguise by converting the harmful high-frequency capacitive coupling noise into a useful compensation signal. The inverse gate driver clock, which would normally be considered waste energy or interference, is instead utilized to generate precise compensation signals that actively cancel the noise. This transforms the harmful effect of high-frequency operation into a beneficial noise cancellation mechanism, allowing high refresh rates without sacrificing touch sensing accuracy
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
Significantly reduces the likelihood of false positives and ensures accurate touch detection by minimizing voltage fluctuations caused by gate driver clock noise, thereby enhancing the reliability of touch sensing in electronic displays.
Implementation Method 1
noise from a gate driver clock of the gates of the pixels and/or noise from data-lines may pull a voltage of a touch sensing layer up or down in the direction of the clock voltage fluctuation due to capacitive coupling with a substrate on which pixel circuitry is mounted
Data Source
AI summary
Electronic devices, storage medium containing instructions, and methods pertain to cancelling noise that results from application of clocks/clock drivers of a display. The electronic display may inject counter noise into the cathode. For example, the counter noise may be injected via a sensing layer, via unused clocks, and/or via a power rail of the display.