Integrated Display Pixel Sensors for Biometric Detection
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Solution Overview
Problem
Existing display devices face challenges in improving the sensing performance of biometric information recognition, particularly in integrating biometric sensors with display functionalities without compromising display quality.
Innovation Solution
A display device is designed with a pixel and sensor structure that includes a light emitting element, pixel driving circuit, light receiving element, and sensor driving circuit, incorporating transistors and capacitors to enhance biometric information sensing capabilities while maintaining display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If biometric sensors are integrated with display pixels, then biometric information sensing capability is improved, but device complexity increases
Solution Approach 1:
The patent combines display pixel functionality with biometric sensing functionality into a single integrated structure. The sensor is formed within the pixel structure, sharing common elements such as the light emitting element and circuit layers, thereby achieving multi-functionality while managing complexity through consolidation rather than addition of separate components
Solution Approach 2:
The pixel structure is designed to serve multiple functions: displaying visual information through the light emitting element and simultaneously sensing biometric information through the light receiving element. This multi-functional design allows a single component to perform both display and sensing tasks, improving adaptability without proportionally increasing device complexity
2Measurement precision
If sensor driving circuit is added to enhance sensing performance, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor driving circuit is integrated within the pixel structure, sharing circuit elements and layers with the display functionality. The pixel driving circuit and sensor driving circuit are combined in the same circuit layer, utilizing common signal lines and control mechanisms to reduce overall device complexity while maintaining enhanced sensing performance
Solution Approach 2:
The sensor driving circuit is designed to operate autonomously within the pixel, using locally generated control signals and voltages to manage the light receiving element and processing circuit. This self-service approach reduces the need for external control circuitry, improving measurement precision while minimizing the increase in device complexity
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 proposed structure enhances biometric information sensing performance by improving the detection of user inputs and biometric data, such as fingerprints, while maintaining the display's image quality and functionality.
Implementation Method 1
each of which includes a light emitting element and a pixel driving circuit connected to the light emitting element and a plurality of sensors, each of which includes a light receiving element
Data Source
AI summary
A display device includes a plurality of pixels, each of which includes a light emitting element and a pixel driving circuit and a plurality of sensors, each of which includes a light receiving element and a sensor driving circuit. The sensor driving circuit includes a first reset transistor, a second reset transistor, a sensing capacitor, an amplification transistor, and an output transistor. The first reset transistor includes a first electrode receiving a reset voltage, a second electrode connected to a first sensing node, and a third electrode receiving a reset control signal. The second reset transistor includes a first electrode receiving the reset voltage, a second electrode connected to a second sensing node, and a third electrode receiving the reset control signal. The sensing capacitor is positioned between the first sensing node and the second sensing node.