Upconversion Display Panel for Near-Infrared Light Sensing
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Solution Overview
Problem
Conventional display panels have a relatively narrow wavelength range for interactive light, limiting their ability to interact with visible light and near-infrared light due to the metal oxide active layer's limited absorption capabilities.
Innovation Solution
Incorporating an upconversion material layer doped with lanthanide nanomaterials, such as NaYF4:Yb, Tm, Er, between the interactive light source and the metal oxide active layer, which converts interactive light from a first wave band into a second wave band within the absorption range of the metal oxide active layer, enabling the light-sensing transistor to convert light intensity signals into electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal oxide active layer is used in the light-sensing transistor, then electron mobility and stability are improved, but the wavelength range of absorbable light is limited to ultraviolet only
Solution Approach 1:
An upconversion material layer is introduced as an intermediary between the interactive light source and the metal oxide active layer. This layer converts visible light and near-infrared light (first wave band) into ultraviolet light (second wave band) through upconversion, enabling the metal oxide active layer to detect these wavelengths indirectly. The intermediary resolves the contradiction by bridging the gap between the light source wavelength and the detector's absorption range.
Solution Approach 2:
The optical parameters of the light are changed through the upconversion material layer, which transforms light from the first wave band (visible/near-infrared) to the second wave band (ultraviolet). This parameter transformation allows the metal oxide active layer to maintain its ultraviolet absorption capability while effectively detecting a broader spectrum of light, thus resolving the wavelength range limitation.
2Adaptability or versatility
If the metal oxide active layer directly detects visible light and near-infrared light, then the wavelength range is expanded, but the electron mobility and stability are compromised
Solution Approach 1:
The upconversion material layer serves as a mediator that allows visible light and near-infrared light to be detected while maintaining the metal oxide active layer's ultraviolet absorption characteristics. This intermediary approach enables wavelength expansion without compromising the inherent reliability of the metal oxide transistor, as the active layer continues to operate in its optimal ultraviolet detection mode.
3Ease of manufacture
If conventional display panel structure is used, then manufacturing simplicity is maintained, but the interactive light wavelength range remains narrow
Solution Approach 1:
The display panel employs a composite structure combining the upconversion material layer with the metal oxide active layer. This composite design integrates the light-conversion capability of upconversion materials with the high-performance transistor characteristics of metal oxide, achieving both broad wavelength detection and manufacturing feasibility through established thin-film fabrication techniques.
Solution Approach 2:
The upconversion material layer adds multi-functionality to the display panel, enabling it to interact with both ultraviolet light (direct detection by metal oxide) and visible/near-infrared light (converted to ultraviolet). This universal light detection capability is achieved through a relatively simple structural addition that maintains ease of manufacture while significantly expanding functional versatility.
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 expands the wavelength range of interactable light, allowing display panels to effectively sense and interact with visible light and near-infrared light, enhancing their interactive properties and touch control capabilities.
Implementation Method 1
an upconversion material layer, wherein the upconversion material layer is configured to absorb interactive light emitted from an interactive light source and convert the interactive light from a first wave band into a second wave band
Implementation Method 2
the metal oxide active layer can only absorb ultraviolet light that has relatively wavelengths, but cannot absorb visible light
Data Source
AI summary
A display panel and a display device are provided. In the display panel, an upconversion material layer is configured to convert interactive light from a first wave band into a second wave band. A light-sensing transistor of a light-sensing circuit is configured to convert a light intensity signal of the interactive light into an electrical signal after the wave band of the interactive light is converted. A position-detecting circuit is configured to identify a position where the interactive light is irradiated according to the electrical signal. Therefore, the display panel can interact with light having relatively long wavelengths.