Integrated Display Pixel and Sensor Circuit for Biometric Sensing
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Solution Overview
Problem
Existing display devices lack efficient integration of biometric information recognition capabilities, particularly in sensing user inputs and biometric information through a unified pixel and sensor structure.
Innovation Solution
A display device incorporating a display panel with integrated pixel and sensor circuits, including emission elements and light sensing elements, utilizing specific transistor configurations for synchronized operation with scan signals to facilitate biometric information recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate circuits are used for display and biometric sensing, then each function can be independently optimized, but device complexity and space requirements increase
Solution Approach 1:
The patent combines display and biometric sensing functions into a single integrated pixel structure. The pixel circuit includes both an emission element for display and a light sensing element for biometric recognition, sharing common components such as the capacitor and transistor control structures. This merging eliminates the need for separate sensing circuits, reducing overall device complexity while maintaining both display and biometric recognition capabilities.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions: displaying visual information through the emission element and sensing biometric information through the light sensing element. The same pixel structure and driving circuitry support both display operations and fingerprint recognition, making the system universal and eliminating the need for dedicated separate circuits for each function.
2Device complexity
If integrated pixel and sensor circuits are used, then device complexity is reduced, but sensing precision and display performance may be compromised
Solution Approach 1:
Within the integrated pixel, the circuit is segmented into distinct functional components: an emission element for display and a light sensing element for biometric sensing. Each component has its dedicated control transistors and storage capacitors, allowing independent optimization of display and sensing operations. This segmentation within integration ensures that sensing precision is maintained despite the combined structure.
Solution Approach 2:
The integrated pixel structure provides different local qualities for different functions: the emission element is optimized for light output with appropriate driving circuits, while the light sensing element is optimized for light detection with dedicated amplifying transistors and storage capacitors. Each region of the pixel is locally optimized for its specific function, ensuring high sensing precision while maintaining display performance.
3Adaptability or versatility
If multiple transistors and capacitors are integrated per pixel, then sensing and display functions are enabled, but manufacturing precision requirements increase
Solution Approach 1:
The pixel circuit uses dynamic control through multiple transistors (first, second, third, and fourth transistors) that are activated at different times during the frame period. The transistors dynamically switch between charging the capacitor during the emission period and transferring charge to the sensing element during the sensing period. This dynamic operation allows the same hardware components to serve multiple functions without requiring excessive manufacturing precision.
Solution Approach 2:
The pixel operates in periodic cycles, alternating between display emission periods and biometric sensing periods. During the emission period, the first transistor charges the capacitor to drive the emission element. During the sensing period, the third transistor transfers the stored charge to the light sensing element. This periodic action allows time-multiplexed operation of the integrated circuit, reducing the precision requirements compared to simultaneous multi-function operation.
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
Enables simultaneous display and biometric information sensing, enhancing user interaction and security features without compromising display performance.
Implementation Method 1
Each of the sensors may include a light sensing element and a sensor driving circuit connected to the light sensing element
Data Source
AI summary
A display device may include a pixel and a sensor. The pixel may include an emission element and a pixel driving circuit. The pixel driving circuit may receive a first scan signal and a second scan signal. The sensor may include a light sensing element and a sensor driving circuit. The sensor driving circuit may include a reset transistor, an amplifying transistor, and an output transistor. The reset transistor may receive a reset voltage and the first scan signal and be connected to a first sensing node. The amplifying transistor may receive a first driving voltage and be connected between the first sensing node and a second sensing node. The output transistor may receive the second scan signals and be connected between the second sensing node and a readout line.