Integrated Display Sensor Circuit for Biometric Signal Detection
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Solution Overview
Problem
Existing display devices face challenges in enhancing the sensing performance of biometric information recognition, particularly in integrating biometric sensors effectively with display functionalities.
Innovation Solution
The display device incorporates a pixel driving circuit and a sensor driving circuit, including transistors such as a reset transistor, amplification transistor, and output transistor, with the reset transistor being an oxide semiconductor transistor, to improve biometric information sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If biometric sensors are integrated with display functions, then sensing performance is improved, but device complexity increases
Solution Approach 1:
The patent combines biometric sensing functions with display pixel structures by integrating light sensing elements into the display panel. The sensor driving circuit shares the same substrate and manufacturing process as the display circuit, merging two functional systems into a single integrated device that maintains both display and biometric sensing capabilities.
Solution Approach 2:
The display device is designed to perform multiple functions simultaneously: displaying visual information through light emitting elements and sensing biometric information through light sensing elements. The sensor driving circuit can operate independently or in conjunction with the pixel driving circuit, enabling the device to adapt to different operational modes including display-only, sensing-only, and combined modes.
2Productivity
If sensor driving circuit is integrated with pixel driving circuit, then manufacturing efficiency is improved, but circuit design complexity increases
Solution Approach 1:
The driving circuit is divided into distinct functional modules: pixel driving circuits for display control and sensor driving circuits for biometric sensing. Each module has dedicated transistors and signal paths, allowing independent design optimization while sharing the same manufacturing substrate and process steps.
Solution Approach 2:
The patent employs oxide semiconductor transistors with specific electrical characteristics (low leakage current, high on-state current) to optimize sensor signal detection. By carefully controlling transistor parameters such as threshold voltage and mobility, the circuit achieves high sensing precision while maintaining compatibility with standard display manufacturing processes.
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 sensing performance of biometric information recognition by integrating biometric sensors seamlessly with display functions, improving accuracy and efficiency.
Implementation Method 1
a light sensing element and a sensor driving circuit connected with the light sensing element to output a sensing signal corresponding to a light
Data Source
AI summary
A display device includes: a pixel driving circuit configured to drive the light emitting elements of pixels; and sensors including a light sensing element and a sensor driving circuit connected with the light sensing element and configured to output a sensing signal corresponding to a light, the sensor driving circuit including: a reset transistor including a first electrode configured to receive a reset signal, a second electrode connected with a first sensing node, and a third electrode configured to receive a reset control signal; an amplification transistor including a first electrode configured to receive a sensing driving voltage, a second electrode connected with a second sensing node, and a third electrode connected with the first sensing node; and an output transistor including a first electrode connected with the second sensing node, a second electrode connected with a sensing line, and a third electrode configured to receive an output control signal.