Integrated Display Sensor Layout for Fingerprint Sensitivity
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Solution Overview
Problem
Existing display devices face challenges in enhancing the sensitivity of sensors, particularly fingerprint sensors, which are often manufactured as separate modules and may not integrate seamlessly with the display panel, leading to potential inefficiencies and reduced performance.
Innovation Solution
The display device incorporates a data line connected to a pixel circuit and a light emitting element, with a sensing circuit and a light receiving element, all integrated within the same layer, allowing for improved sensor sensitivity through a more integrated and efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate module is used for fingerprint sensors, then manufacturing flexibility is maintained, but sensor sensitivity and integration performance deteriorate
Solution Approach 1:
The patent merges the sensor module with the display panel by integrating the sensing electrode into the same layer structure as the display elements. The sensing electrode is formed in the same layer as the lower metal layer, allowing the fingerprint sensor to be seamlessly integrated with the display panel, thereby improving sensor sensitivity while maintaining manufacturing efficiency through a unified structure.
2Measurement precision
If sensors are integrated into the display panel, then sensor sensitivity improves, but manufacturing process complexity increases
Solution Approach 1:
The patent implements multi-functionality by using the same lower metal layer for both display electrode connections and sensor electrode formation. This universal layer serves dual purposes: connecting display elements and forming sensing electrodes, thereby simplifying the manufacturing process while achieving high sensor sensitivity through integrated design.
3Reliability
If a first connection electrode is placed under the data line, then electrical connection is achieved, but sensor performance may be affected by interference
Solution Approach 1:
The patent introduces an intermediary structure by forming the sensing electrode in the same layer as the lower metal layer but electrically isolating it through appropriate layer design. This intermediary approach allows the sensing electrode to be positioned under the data line for reliable connection while preventing harmful electromagnetic interference through structural separation and insulation layers.
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 integrated design enhances the sensitivity and performance of sensors, such as fingerprint sensors, by optimizing their integration with the display panel, thereby improving user interaction and functionality.
Implementation Method 1
a light emitting element connected to the pixel circuit
Implementation Method 2
a light receiving element connected to the sensing circuit
Data Source
AI summary
A display device includes: a data line; a pixel circuit connected to the data line; a light emitting element connected to the pixel circuit; a first connection electrode under the data line; a sensing circuit connected to the first connection electrode; a light receiving element connected to the sensing circuit; and a receive line under the first connection electrode and connected to the first connection electrode.