In-Plane Photosensor Integration for Display Biometric Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in integrating biometric sensors due to performance degradation when sensors are disposed under the display panel and design limitations when manufactured as separate modules, as the performance and physical properties of sensors and display panels differ.
Innovation Solution
A sensor-embedded display panel is developed with a light emitting element and photosensor integrated on a substrate, sharing a common auxiliary layer and connected as a single piece of material, utilizing semiconductors with specific energy levels and sublimation temperatures to enhance performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor is disposed under the display panel, then the display device can include a sensor for biometric recognition, but the object recognition performance is degraded due to light absorption by various films and parts
Solution Approach 1:
The patent transitions the sensor from a position underneath the display panel to an in-plane integration within the display panel structure. By embedding the photosensor in the same plane as the light emitting elements and utilizing the in-plane direction for light detection, the sensor avoids light absorption by overlying films and achieves improved recognition performance while maintaining biometric functionality
2Ease of manufacture
If the sensor is manufactured as a separate module and mounted on the outside of the display panel, then the sensor can be independently manufactured, but there are limitations in terms of design and usability
Solution Approach 1:
The patent merges the sensor manufacturing process with the display panel manufacturing process by integrating the photosensor formation steps into the existing OLED fabrication sequence. The sensor and display components are fabricated simultaneously on the same substrate using compatible materials and processes, achieving both ease of manufacture and enhanced design flexibility
Solution Approach 2:
The patent creates a multi-functional display panel that simultaneously provides display functionality through light emitting elements and sensing functionality through photosensors. The integrated structure allows the same device to serve multiple purposes - visual display and biometric recognition - without requiring separate modules, thereby improving design flexibility and usability
3Adaptability or versatility
If a sensor is embedded in the display panel, then design flexibility is improved, but it is difficult to implement due to different performance and physical properties required for display panel and sensor
Solution Approach 1:
The patent adjusts material parameters and structural configurations to reconcile the different requirements of display and sensor functions. By modifying layer thicknesses, material compositions, and optical properties of intermediate layers, the patent achieves compatibility between the light emitting and photosensing components, enabling successful integration despite their different performance requirements
Solution Approach 2:
The patent introduces intermediary layers and structures that mediate between the display and sensor components. These intermediate elements facilitate optical coupling, electrical isolation, and mechanical compatibility between the light emitting elements and photosensors, reducing integration complexity and enabling successful embedding of the sensor within the display panel
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 integrated sensor-embedded display panel achieves improved optical and electrical performance while enhancing design and usability, allowing for high-performance biometric recognition.
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
A sensor-embedded display panel includes a light emitting element on a substrate and including a light emitting layer, and a photosensor including a photosensitive layer on the substrate and arranged in parallel with the light emitting layer along an in-plane direction of the substrate such that the photosensor and the light emitting layer at least partially overlap in the in-plane direction, wherein the light emitting element and the photosensor further include separate, respective portions of a first common auxiliary layer disposed under each of the light emitting layer and the photosensitive layer and connected to each other to be a single piece of material extending continuously between the light emitting element and the photosensor, and the photosensitive layer includes a first semiconductor represented by Chemical Formula 1 and a second semiconductor not including any fullerenes and forming a pn junction with the first semiconductor.