Biometric Sensing Circuit Integration in Display Panels
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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 with display functionalities without compromising display quality.
Innovation Solution
The display device incorporates a sensor driving circuit with transistors, including a reset transistor, amplification transistor, and an output transistor, utilizing oxide semiconductor transistors to improve sensing performance, and integrates a light sensing element with a pixel driving circuit to recognize biometric information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometric sensors are integrated into the display device, then biometric information recognition capability is improved, but display quality may be degraded
Solution Approach 1:
The display device is segmented into distinct functional regions: pixel regions for display and sensor regions for biometric recognition. Each region is independently optimized with its own circuitry (pixel driving circuits vs. sensor driving circuits), allowing the sensor functionality to be integrated without compromising the display quality in the pixel regions.
Solution Approach 2:
The patent merges the display function and biometric sensing function into a single integrated device structure. The sensor driving circuit shares the same substrate and manufacturing process as the pixel driving circuit, enabling both functions to coexist in one device without requiring separate components, thus maintaining display quality while adding biometric recognition capability.
2Device complexity
If sensor driving circuit is integrated with pixel driving circuit, then device complexity is reduced, but sensing performance may be compromised
Solution Approach 1:
While integrating both circuits on the same substrate, the patent segments the circuit functions into distinct blocks: pixel driving circuits for display control and sensor driving circuits for biometric sensing. Each circuit type has its own dedicated transistors and signal paths, preventing interference and maintaining high sensing performance despite the integrated structure.
Solution Approach 2:
The sensor driving circuit employs oxide semiconductor transistors specifically in the sensor region, providing locally optimized electrical characteristics for high-precision sensing. This local quality enhancement ensures that the sensing performance is not compromised by the integration with the pixel driving circuit, as each region uses materials and structures optimized for its specific function.
3Measurement precision
If oxide semiconductor transistors are used in sensor driving circuit, then sensing performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the manufacturing processes for oxide semiconductor transistors with the existing LCD manufacturing process. The oxide semiconductor layer is formed using standard thin-film deposition techniques that can be integrated into the current production line, allowing high-precision sensing performance to be achieved without significantly increasing manufacturing complexity or requiring entirely new fabrication equipment.
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 solution enhances the sensing performance of biometric information recognition, allowing for improved integration of biometric sensors within the display device without degrading display quality.
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.