Integrated Display Panel Circuit for Full-Area Fingerprint Sensing
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Solution Overview
Problem
Existing display devices face challenges in improving the sensing performance of biometric information recognition, particularly in detecting user inputs and biometric information with enhanced accuracy and efficiency.
Innovation Solution
A display device incorporating a biometric information sensing area on its surface, equipped with a flexible organic light emitting display panel, a fingerprint recognition sensor, and a photodiode-based light receiving element, which alternates with pixels and utilizes a specific circuit structure to enhance sensing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional display structure is used, then the device structure is simple, but the biometric information sensing performance is insufficient
Solution Approach 1:
The patent merges the display panel and fingerprint sensing sensor into a single integrated structure. The sensing electrode patterns are formed within the display panel structure itself, eliminating the need for separate sensing layers. This integration allows the display device to perform both display and biometric recognition functions simultaneously, improving sensing accuracy while managing device complexity through functional consolidation.
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both a display device and a biometric information sensor. The same structural components (electrode patterns, insulating layers) are utilized for both display operation and fingerprint sensing, enabling the device to perform diverse functions without proportionally increasing complexity.
2Measurement precision
If separate sensing layers are added to improve biometric detection, then sensing capability is enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The sensing electrode patterns are formed within the existing display panel manufacturing process, specifically within the pixel electrode structure. This eliminates the need for separate sensing layer deposition and patterning steps, allowing fingerprint sensing functionality to be integrated into the standard display manufacturing flow without adding significant manufacturing complexity.
3Measurement precision
If the sensing area is increased to improve detection coverage, then biometric recognition capability is enhanced, but the display area is reduced
Solution Approach 1:
The display panel structure is designed to perform dual functions across the entire surface: display and biometric sensing. By utilizing the same electrode patterns and structural layers for both functions, the patent enables full-area sensing without sacrificing display area, as no separate sensing region is required.
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 enables improved biometric information detection, including fingerprint recognition, with enhanced accuracy and efficiency, and supports various input forms such as touch and hovering, while maintaining image display functionality.
Implementation Method 1
a light emitting element ED and a pixel driving circuit PD
Implementation Method 2
a light receiving element OPD
Data Source
Figure 1~2
Figure 3
Figure 4A
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.