Integrated Display Sensor Circuit for Biometric and Touch Recognition
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Solution Overview
Problem
Existing display devices face challenges in simultaneously enhancing biometric information recognition and touch recognition performance, particularly in integrating biometric sensors and touch-sensitive inputs efficiently.
Innovation Solution
A display device design incorporating a light-sensing element connected to a first sensing node, transistors, and a compensation capacitor, with specific transistor types and electrical connections to improve biometric and touch recognition capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint sensor is integrated into a display device, then biometric information recognition capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the fingerprint sensor and touch sensor into a single integrated sensor structure. The sensor includes a light-sensing element, multiple transistors (first through fourth transistors), and capacitors (first and second capacitors) that work together to perform both fingerprint recognition and touch recognition functions, thereby improving biometric capability while managing device complexity through consolidation.
Solution Approach 2:
The integrated sensor is designed to perform multiple functions: it can recognize both fingerprint patterns and touch inputs. The sensor circuit can operate in different modes (fingerprint recognition mode and touch recognition mode) by controlling the switching of transistors and the charging/discharging of capacitors, making the device more versatile without requiring separate dedicated sensors for each function.
2Measurement precision
If sensor circuit components are added to improve sensing performance, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor circuit employs a nested structure where the fourth transistor is positioned within or alongside the existing transistor arrangement, and the second capacitor is integrated into the circuit topology. This nesting allows additional sensing components to be added without proportionally increasing overall device complexity, as the new components are embedded within the existing structural framework.
Solution Approach 2:
The sensor circuit is divided into functional segments: the light-sensing element, the first transistor for signal amplification, the second transistor for switching, the third transistor for control, and the first and second capacitors for signal conditioning. This segmentation allows each component to be optimized for its specific function, improving overall measurement precision while enabling modular integration that manages complexity.
3Adaptability or versatility
If multiple transistors and capacitors are integrated into the sensor circuit, then biometric and touch recognition performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different regions of the sensor circuit are designed with locally optimized characteristics. For example, the first capacitor is positioned to optimize fingerprint sensing performance, while the second capacitor and fourth transistor are arranged to enhance touch sensing capability. This local quality approach allows each component to be manufactured with precision tailored to its specific functional requirements, rather than requiring uniform high precision across the entire device.
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 design enhances biometric and touch recognition performance by optimizing sensor and pixel circuit configurations, enabling efficient integration and improved responsiveness.
Implementation Method 1
a light-sensing element connected to a first sensing node
Data Source
AI summary
Disclosed is a sensor of a display device including a light-sensing element connected to a first sensing node, a first transistor connected between a reset voltage line and the first sensing node, a second transistor connected between a sensor-driving voltage line and a second sensing node, and including a gate electrode connected to the first sensing node, a third transistor connected between the second sensing node and a readout line, and including a gate electrode connected to a scan line, and a compensation capacitor connected between the gate electrode of the second transistor and the scan line.