Sensor-Embedded Display Panel with Common Auxiliary Layers
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Solution Overview
Problem
Existing display devices face challenges in integrating biometric sensors effectively due to differences in performance and physical properties between sensors and display panels, leading to degraded performance and design limitations when sensors are either embedded under the panel or manufactured as separate modules.
Innovation Solution
A sensor-embedded display panel is designed with a light emitting element and a sensor on a substrate, featuring a photosensitive layer and light emitting layer arranged in parallel, utilizing a common auxiliary layer with hole and electron transport materials, and an insertion layer with a metal or metal compound to enhance light absorption and conversion into electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is disposed under the display panel, then the display panel can maintain its structure, but the recognition performance is degraded due to light passing through various films and parts
Solution Approach 1:
The sensor is positioned in the same plane as the light emitting element rather than underneath it, changing the spatial dimension from vertical stacking to lateral arrangement. This allows the sensor to receive light directly without it passing through multiple display panel films, thereby maintaining recognition performance while preserving display structure.
Solution Approach 2:
A common auxiliary layer is introduced as an intermediary component between the light emitting element and sensor. This layer facilitates efficient light transfer from the light emitting element to the photosensitive layer while maintaining the planar integration structure, solving the problem of light degradation through multiple films.
2Reliability
If the sensor is manufactured as a separate module and mounted on the outside, then the sensor can be independently optimized, but design flexibility and usability are limited
Solution Approach 1:
The sensor and light emitting element are merged into a single integrated structure on the same substrate, sharing common auxiliary layers (hole transport layer and electron transport layer). This integration maintains independent sensor optimization while enabling flexible display device designs without separate module mounting.
Solution Approach 2:
The common auxiliary layers serve multiple functions: they act as charge transport layers for the light emitting element and as structural/support layers for the integrated sensor. This multi-functionality enables both components to operate optimally within a unified structure, enhancing design flexibility.
3Reliability
If the sensor and light emitting element use completely separate structures, then each can be independently optimized, but the device complexity increases
Solution Approach 1:
The hole transport layer and electron transport layer are shared between the light emitting element and sensor, forming a common auxiliary structure. This merging reduces the total number of separate layers and components while maintaining independent optimization capabilities for each functional element.
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 integration improves biometric recognition performance by allowing the sensor to function seamlessly with the display panel, offering enhanced design flexibility and usability without increasing thickness, and reduces power consumption by using emitted light for 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
a light emitting element on a substrate and including a light emitting layer
Data Source
AI summary
A sensor-embedded display panel includes a light emitting element and a sensor which include separate portions of a first common auxiliary layer including a hole transport material and a second common auxiliary layer including an electron transport material. The sensor includes first and second semiconductor layers proximate to the first and second common auxiliary layers, respectively, and including a p-type semiconductor and a non-fullerene n-type semiconductor having a LUMO energy level deeper than that of the electron transport material, respectively. An insertion layer between the second semiconductor layer and the second common auxiliary layer includes a metal, a metal compound, or any combination thereof. A work function of the metal or a LUMO energy level of the metal compound is deeper or shallower than the LUMO energy level of the non-fullerene n-type semiconductor and the LUMO energy level of the electron transport material within less than about 1.3 eV, respectively.