Gesture Sensor Electrode Layout for Interference-Free Display Sensing
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing the proximity and motion of objects due to interference from conductors providing constant voltage to light emitting elements, which affects touch sensing sensitivity and capacitance measurements.
Innovation Solution
The display device incorporates a sensor design where the gesture sensor electrode does not overlap conductors like the cathode electrode or power lines, allowing for improved capacitance sensing by separating these components and enhancing the accuracy of proximity and motion detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gesture sensor electrode overlaps with conductors providing constant voltage to light emitting elements, then the device structure is simplified, but the measurement precision of proximity and motion sensing deteriorates due to capacitance interference
Solution Approach 1:
The gesture sensor electrode is extracted from overlapping regions with voltage-providing conductors (cathode electrodes and power lines). The sensor electrode is positioned only in regions where it does not overlap with these conductors, removing the source of capacitance interference while maintaining the functional integrity of the display device.
Solution Approach 2:
The patent resolves the spatial conflict by utilizing the planar dimension for separation. The gesture sensor electrode is configured to exist in regions that are spatially separated from conductors in the same plane, avoiding overlap while maintaining structural integration of the display device.
2Area of stationary object
If conductors are placed close to gesture sensor electrodes to minimize device area, then the device area is reduced, but the reliability of capacitance sensing deteriorates due to increased interference
Solution Approach 1:
The harmful overlapping region between conductors and gesture sensor electrodes is extracted and eliminated. The sensor electrode is configured to occupy only those regions where no voltage-providing conductors are present, removing the source of reliability degradation while maintaining compact device design.
3Device complexity
If the gesture sensor electrode overlaps with transistors, then the device structure is simplified, but the measurement precision of touch sensing deteriorates
Solution Approach 1:
The gesture sensor electrode is extracted from regions where transistors are located. The electrode is configured to overlap only with insulating layers and not with active transistor regions, eliminating interference with touch sensing while maintaining structural integration.
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 improves touch sensing sensitivity and enables more accurate detection of object proximity and motion, even at greater distances, by minimizing capacitance interference from conductors.
Implementation Method 1
a gesture sensor electrode for sensing proximity or motion of an object... the sensing driver may sense proximity or motion of an object based on a change in a first capacitance between at least one of the touch electrodes and the gesture sensor electrode
Data Source
AI summary
A display device includes a display layer disposed on a substrate. The display layer includes a light emitting elements. A sensor is disposed on the display layer. Sensing lines of the sensor are disposed outside touch electrodes of the sensor and are electrically connected to the touch electrodes. A gesture sensor electrode of the sensor is disposed outside the sensing lines. In a plan view, the gesture sensor electrode does not overlap a conductor which provide a constant voltage to the light emitting elements.