Display Device Spacer Layer Reduces Sensor Crosstalk
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Solution Overview
Problem
Integration of touch sensors and photosensitive sensors in display panels leads to parasitic capacitance and signal crosstalk due to their proximity, affecting the reliability of the display device.
Innovation Solution
A display device structure with a spacer layer between the photosensitive sensor and the touch sensor, where the receiving electrode is positioned on the side of the spacer layer away from the photosensitive sensor, and the gate and receiving electrode are disposed on opposite sides of the spacer layer, reducing parasitic capacitance and signal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch sensors and photosensitive sensors are integrated into the display panel, then the functionality of the display device is enhanced, but signal crosstalk occurs between the sensors due to parasitic capacitance
Solution Approach 1:
A spacer layer is introduced between the photosensitive sensor and the touch sensor as an intermediary structure. This spacer layer physically separates the two sensors, reducing parasitic capacitance and signal crosstalk while allowing both sensors to function simultaneously. The spacer layer acts as a mediator that enables coexistence of both sensor types without direct interference.
Solution Approach 2:
The patent positions the receiving electrode on a different substrate layer (second substrate) rather than on the same plane as the photosensitive sensor. This vertical separation in the Z-dimension reduces parasitic capacitance between the sensors while maintaining their functional integration in the display panel.
2Measurement precision
If the receiving electrode is positioned close to the photosensitive sensor, then the touch sensor sensitivity is improved, but parasitic capacitance increases causing signal crosstalk
Solution Approach 1:
The receiving electrode is moved to the second substrate, creating vertical separation from the photosensitive sensor on the first substrate. This dimensional change allows the receiving electrode to maintain sufficient proximity for touch sensitivity while eliminating direct lateral contact that would generate parasitic capacitance.
Solution Approach 2:
The spacer layer serves as an intermediary between the photosensitive sensor and the receiving electrode, allowing them to be positioned close together for sensitivity while preventing direct electrical interaction that would cause parasitic capacitance.
3Ease of manufacture
If the gate and receiving electrode are disposed on the same side of the spacer layer, then the manufacturing process is simplified, but signal crosstalk between sensors increases
Solution Approach 1:
The gate is positioned on the first substrate while the receiving electrode is positioned on the second substrate, creating vertical separation across the spacer layer. This dimensional arrangement reduces signal crosstalk while maintaining manufacturing feasibility through sequential layer deposition.
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 enhances the reliability of the display device by minimizing signal interference between the sensors, enabling simultaneous operation of the photosensitive and touch sensors for short-range touch and remote control functions.
Implementation Method 1
there is a parasitic capacitance between the photosensitive sensors and the touch sensors
Data Source
AI summary
A display device and a manufacturing method thereof are provided. The display device includes a first substrate, a first array structure layer disposed on the first substrate, and a second substrate disposed on the first array structure layer. The first array structure layer includes a photosensitive sensor, a touch sensor, and a spacer layer. The touch sensor includes a receiving electrode. The spacer layer is disposed between the photosensitive sensor and the receiving electrode. The receiving electrode is disposed on a side of the spacer layer away from the photosensitive sensor.