Shared Electrode Display for Fingerprint Authentication
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Solution Overview
Problem
The increasing number of components in electronic devices with authentication functions, such as fingerprint scanners, leads to higher costs and reduced screen occupancy rates.
Innovation Solution
A display device incorporating a light-emitting element and a light-receiving element, both sharing common electrodes and layers, which allows for simultaneous touch detection and fingerprint imaging without the need for additional modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fingerprint sensor module is added to an electronic device for authentication, then authentication function is achieved, but the number of components increases and cost increases
Solution Approach 1:
The patent merges the fingerprint sensor function with the existing display device by integrating a light-receiving element into the display structure. The light-receiving element is positioned to receive light reflected from the fingerprint, enabling authentication without requiring a separate fingerprint sensor module. This combining approach reduces the overall number of components while achieving the authentication function.
Solution Approach 2:
The display device is designed to perform multiple functions: display output and fingerprint authentication. The light-receiving element serves dual purposes by being part of the display structure while also enabling fingerprint sensing. This multi-functionality eliminates the need for dedicated authentication components, reducing device complexity.
2Reliability
If a fingerprint sensor module is added to an electronic device for authentication, then authentication function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the fingerprint sensing capability with the existing display manufacturing process. The light-receiving element is integrated into the display structure during the same manufacturing steps, eliminating the need for separate assembly of a fingerprint sensor module. This integration reduces manufacturing complexity and cost.
Solution Approach 2:
The display device structure is designed to serve both display and authentication functions, allowing a single manufacturing process to produce a multi-functional device. This approach eliminates the need for additional manufacturing steps and components associated with separate fingerprint sensors, reducing overall manufacturing cost.
3Reliability
If a fingerprint sensor module is added to an electronic device for authentication, then authentication function is achieved, but screen occupancy rate decreases
Solution Approach 1:
The patent merges the fingerprint sensing function within the existing display area by positioning the light-receiving element to work with the display pixels. The authentication function is achieved using the display structure itself, eliminating the need for additional space-consuming sensor modules and maintaining high screen occupancy rate.
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 solution reduces the number of components and manufacturing costs, increases the screen occupancy rate by integrating fingerprint imaging into the display, and provides a high-security, user-friendly authentication method.
Implementation Method 1
The light-emitting element includes a first pixel electrode, a light-emitting layer, and a common electrode
Implementation Method 2
The light-receiving element includes a second pixel electrode, an active layer, and the common electrode. The light-receiving element has a function of receiving light emitted from the light-emitting element
Data Source
AI summary
A display device featuring a touch detection and a fingerprint imaging functions is provided. A display device includes a light-emitting element and a light-receiving element. The light-emitting element includes a first pixel electrode, a light-emitting layer, and a common electrode, and the light-receiving element includes a second pixel electrode, an active layer, and the common electrode. The first pixel electrode and the second pixel electrode are provided on the same plane. The common electrode overlaps with the first pixel electrode with the light-emitting layer therebetween, and overlaps with the second pixel electrode with the active layer therebetween. A first conductive layer, a second conductive layer, and an insulating layer are provided above the common electrode. The insulating layer is provided above the first conductive layer, and the second conductive layer is provided above the insulating layer. The light-receiving element has a function of receiving light emitted from the light-emitting element.