Green-Absorbing Organic Photodiode Material for Under-Display Sensors
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Solution Overview
Problem
Silicon photodiodes used in biometric sensors have limited sensitivity due to small pixel size and absorption area, necessitating the development of organic materials that can selectively absorb light in specific wavelength regions and improve integration with display panels.
Innovation Solution
A compound represented by Chemical Formula 1, which absorbs light in the green wavelength region and maintains thermal stability, is integrated into a photoelectric device, enabling a light absorption sensor and sensor-embedded display panel with enhanced sensitivity and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon photodiode is used in sensor, then device structure is well-established and manufacturing is feasible, but sensitivity deteriorates due to small absorption area
Solution Approach 1:
The patent changes the material parameter from silicon to organic compound, which fundamentally alters the optical absorption characteristics. The organic compound exhibits higher extinction coefficient and different absorption spectrum, enabling improved sensitivity despite similar physical dimensions. This material substitution transforms the absorption properties without requiring larger pixel area.
Solution Approach 2:
The patent employs composite material structure by integrating organic light-absorbing compound with underlying photodiode structure. The organic layer acts as an enhanced absorption medium that works in conjunction with the silicon substrate, creating a hybrid system that combines the structural stability of silicon with the superior optical absorption of organic materials.
2Reliability
If organic material is used to replace silicon photodiode, then sensitivity and integration are improved, but thermal stability becomes a concern under high temperature conditions
Solution Approach 1:
The patent modifies the chemical structure parameters of the organic compound by introducing specific molecular configurations and substituents that enhance thermal resistance. The compound is designed with high glass transition temperature and stable molecular packing, which maintains its optical properties and structural integrity under elevated temperatures during sensor operation.
3Measurement precision
If sensor is disposed under display panel with small pixels, then resolution is improved, but absorption area decreases leading to deteriorated sensitivity
Solution Approach 1:
The patent changes the optical parameter of the absorption material to achieve higher extinction coefficient, which compensates for the reduced physical area. The organic compound's molecular structure is optimized to maximize light absorption cross-section per unit area, enabling small pixels to maintain high sensitivity through enhanced material properties rather than increased size.
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 compound enhances the sensitivity and thermal stability of the photoelectric device, allowing for high-resolution biometric recognition in display devices, particularly in green wavelength regions, while overcoming design and usability limitations.
Implementation Method 1
The photoelectric device used in the sensor as described above is a device that converts light into an electrical signal using the photoelectric effect
Implementation Method 2
The organic material has a high extinction coefficient and selectively absorbs light in a particular wavelength region depending on a molecular structure
Data Source
AI summary
A compound is represented by Chemical Formula 1.In Chemical Formula 1, G, R1, R2, R3, X1, Ar1 and Ar2 are each the same as in the specification.