Embedded Light Absorption Sensor for Under-Display Biometrics
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Solution Overview
Problem
Existing biometric recognition sensors in display devices face performance degradation when disposed under the display panel due to recognition through multiple layers and design limitations when manufactured as separate modules.
Innovation Solution
Integration of an organic compound-based light absorption sensor embedded within the display panel, comprising a photoelectric conversion layer with p-type and n-type semiconductors, allowing for simultaneous light absorption and electrical signal conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is disposed under the display panel, then the display device can achieve biometric recognition, but the sensor performance is degraded due to recognition through multiple layers
Solution Approach 1:
The patent merges the sensor and display panel into a single integrated structure where the sensor is embedded within the display panel layers. This combining eliminates the need for separate sensor modules or placing sensors beneath the entire display, thereby maintaining sensor performance while reducing the negative impact of multiple layers.
Solution Approach 2:
The patent transitions from a planar arrangement where sensors are either separate modules or positioned beneath the display to a vertical integration approach. The sensor is embedded at specific depths within the display panel structure, utilizing the third dimension (depth) to optimize both display functionality and sensor performance simultaneously.
2Ease of manufacture
If the sensor is manufactured as a separate module and mounted on the outside of the display panel, then manufacturing is simplified, but design flexibility and usability are limited
Solution Approach 1:
The sensor and display panel are manufactured as an integrated unit with shared layers and structures. The sensor utilizes the same substrate, encapsulation layers, and manufacturing processes as the display panel, enabling simultaneous production while maintaining design flexibility for various biometric recognition applications.
Solution Approach 2:
The integrated sensor-display structure serves multiple functions: it acts as both a display panel for visual output and a biometric recognition sensor for authentication. This multi-functionality is achieved through the shared layered structure where certain layers serve dual purposes for both display and sensing operations.
3Adaptability or versatility
If an embedded sensor is implemented in the display panel, then design flexibility is improved, but implementation difficulty increases due to different performance requirements
Solution Approach 1:
Different regions and layers of the integrated structure are optimized for specific functions. The encapsulation layers are designed with properties suitable for both display protection and sensor operation, while the organic compound layers are engineered to facilitate both light emission for display and light absorption for sensing. This localized optimization allows the integrated structure to meet diverse performance requirements.
Solution Approach 2:
The patent employs composite material structures where organic compounds serve dual roles in both display and sensor functions. The encapsulation layers and active layers are designed as composite structures that exhibit properties suitable for both light emission (display) and light absorption (sensing), thereby simplifying the integrated implementation while maintaining design flexibility.
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
Enhances sensor performance by maintaining design flexibility and usability while achieving effective light absorption and electrical signal conversion.
Implementation Method 1
the optical type sensor is a sensor configured to absorb light and convert the absorbed light into an electrical signal
Implementation Method 2
The organic material has a large extinction coefficient and may be configured to selectively absorb light in a specific wavelength spectrum according to a molecular structure
Data Source
AI summary
An organic compound is represented by Chemical Formula 1A or Chemical Formula 1B.In Chemical Formulas 1A and 1B, Ar1, Ar2, R1, R2, n, and m are each the same as in the detailed description.