Touch Display Panel Integrating Fingerprint and Force Sensing Matrices
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Solution Overview
Problem
Current touch display panels face challenges in integrating fingerprint recognition and force sensing functions without increasing the display area, while maintaining effective touch functionality and minimizing interference between signals.
Innovation Solution
The design incorporates a first sensing matrix for fingerprint recognition and a second sensing matrix for force sensing, both integrated with a touch sensing matrix, using electrode layers and switch units to transmit signals and receive controlling signals, allowing for simultaneous fingerprint recognition, force sensing, and touch functionality without increasing the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fingerprint recognition area and force touch function are integrated into the display panel, then the display area is reduced, but the smart device can provide additional functionality
Solution Approach 1:
The patent merges fingerprint recognition electrodes, force sensing electrodes, and touch sensing electrodes into a single integrated sensing matrix structure. The first sensing matrix includes fingerprint recognition electrodes arranged in matrix with switch units, while the second sensing matrix includes force sensing electrodes that overlap with pixel circuits. Both sensing matrices share common electrode structures and signal transmission pathways, allowing multiple functions to coexist without proportionally increasing the overall structure size or reducing display area.
Solution Approach 2:
The sensing matrix is designed with multi-functionality where the same electrode layers and switching structures serve multiple purposes. The first sensing matrix handles both fingerprint recognition and touch sensing, while the second sensing matrix handles force sensing. The common electrode structures and signal transmission lines are universally used across all sensing functions, maximizing the utility of each component while minimizing the total area occupied by sensing structures.
2Adaptability or versatility
If multiple sensing matrices are integrated, then signal interference increases, but comprehensive sensing functionality is achieved
Solution Approach 1:
The patent divides the sensing system into two distinct sensing matrices: the first sensing matrix for fingerprint recognition and touch sensing, and the second sensing matrix for force sensing. Each matrix has separate electrode arrangements and signal transmission pathways. The first sensing matrix uses grid units with switch units controlled by first controlling signals, while the second sensing matrix uses overlapping electrodes controlled by second controlling signals. This segmentation isolates signal paths to minimize mutual interference between different sensing functions.
Solution Approach 2:
The patent introduces switch units as intermediary components between the sensing electrodes and signal transmission lines. These switch units are controlled by specific controlling signals to selectively connect or disconnect different sensing pathways. The switch units act as mediators that control signal flow, enabling the system to activate only the required sensing function at any given time and prevent simultaneous signal interference from multiple sensing matrices.
3Adaptability or versatility
If sensing electrodes are added to the display panel, then the touch sensing effectiveness is reduced, but fingerprint recognition and force sensing are enabled
Solution Approach 1:
The patent implements sensing functions in multiple dimensional layers. The first sensing matrix is disposed on one side of the substrate with fingerprint recognition electrodes arranged in a matrix pattern. The second sensing matrix includes electrodes that overlap with pixel circuits in the vertical projection direction. This multi-dimensional arrangement allows sensing functions to operate in different spatial planes, reducing mutual interference and maintaining touch sensing effectiveness while enabling additional sensing capabilities.
Solution Approach 2:
The patent applies different electrode configurations and sensing mechanisms to different local areas of the display panel. The first sensing matrix with grid units and switch units is optimized for fingerprint recognition in specific regions, while the second sensing matrix with overlapping electrodes is optimized for force sensing in display areas. The touch sensing function maintains its original effectiveness in regions where it is implemented, while fingerprint recognition and force sensing are enabled in designated areas without compromising overall touch performance.
Data Source
AI summary
A touch display panel includes a first sensing matrix and a second sensing matrix. The first sensing matrix includes a plurality of grid units and a first switch unit. The grid units are arranged in matrix, wherein each grid unit includes at least one first electrode. The first switch unit includes a plurality of switches, and the switches are disposed between adjacent grid units. Wherein, the control end of the switches is configured to receive a first controlling signal, and one end of each of the switches is configured to output a sensing signal. The second sensing matrix includes at least one second electrode, and is configured to receive a common signal. The second sensing matrix includes a plurality of opening units, and each opening unit overlaps with the open area of each pixel circuit in a vertical projection direction of the first substrate.