Display Sensor Layer Layout for Wideband Pen Input Detection
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Solution Overview
Problem
Existing display devices face challenges in effectively integrating a sensor layer that can accurately sense user inputs while maintaining a wide bandwidth to avoid noise interference, particularly in high-frequency applications such as detecting electronic pens.
Innovation Solution
The display device incorporates a sensor layer with a high pass filter circuit, including a first and second sensing electrode and a plurality of coils under each sensing pattern, which are connected via a voltage applying line and insulated layers to minimize overlap and enhance signal-to-noise ratio, allowing for precise input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor layer is integrated into the display device to detect user inputs, then sensing capability is improved, but noise interference and parasitic capacitance increase
Solution Approach 1:
The patent introduces an intermediate insulation layer between the sensor layer and the display panel, which acts as a mediator to reduce parasitic capacitance and noise interference while allowing the sensor to maintain its sensing capability. This intermediate layer serves as a buffer that isolates the sensor from harmful electrical interference.
Solution Approach 2:
The sensor layer is segmented into multiple independent sensing electrodes with individual coil structures, allowing each sensing element to be optimized and isolated. This segmentation reduces cross-talk and parasitic capacitance between adjacent sensing elements while maintaining overall sensing performance.
2Reliability
If the bandwidth is widened to avoid noise interference, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent adjusts the electrical parameters of the coil structures, including wire diameter, turn density, and spacing, to optimize the bandwidth and signal-to-noise ratio. By carefully controlling these parameters, the system achieves wide bandwidth without requiring complex additional circuitry.
Solution Approach 2:
The sensor system employs dynamic signal processing techniques that adapt to different input conditions, allowing the bandwidth to be optimized in real-time without requiring a permanently complex device architecture. The system dynamically adjusts filtering and amplification based on the detected signal characteristics.
3Measurement precision
If coils are placed under each sensing pattern to enhance sensitivity, then sensing precision is improved, but parasitic capacitance increases
Solution Approach 1:
The patent applies different structural qualities to different regions of the coil structure. The coils under sensing patterns have optimized geometry and spacing to maximize sensitivity while minimizing parasitic capacitance. The intermediate insulation layer is applied selectively in regions where parasitic capacitance is most problematic.
Solution Approach 2:
The patent addresses the parasitic capacitance issue by moving to another dimension - introducing a vertical insulation layer between the coil plane and the sensing electrode plane. This third-dimensional approach reduces capacitance coupling without compromising the horizontal sensitivity of the sensing structure.
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 enables accurate sensing of user inputs, including electronic pens, by minimizing parasitic capacitance and noise interference, thereby ensuring a sufficient bandwidth of 350 KHz to 100 MHz for reliable operation.
Implementation Method 1
a plurality of coils each disposed under a corresponding one of the plurality of first sensing patterns and the plurality of sensing portions
Implementation Method 2
the first sensing electrode and the second sensing electrode each include a high pass filter (HPF)
Data Source
AI summary
Provided is a display device which may include a display panel having an active region in which a plurality of pixels are arranged and a peripheral region, and a sensor layer disposed on the display panel. The sensor layer may include a first sensing electrode including a plurality of first sensing patterns and bridge patterns configured to connect the plurality of first sensing patterns, a second sensing electrode including a plurality of sensing portions and connection portions disposed between the plurality of sensing portions, a plurality of coils each disposed under the plurality of first sensing patterns and the plurality of sensing portions.