Array Substrate Filter Layout for Integrated UV Light Detection
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Solution Overview
Problem
Current ultraviolet light detection structures in display panels are complex and require a cumbersome production process, with polycrystalline silicon materials having poor selectivity and necessitating the use of costly filters to differentiate between visible and ultraviolet light.
Innovation Solution
An array substrate design featuring a base substrate with a groove and layered structures including filter layers and an active layer, where the first filter layer reflects ambient light to the second filter layer, which then reflects it to the active layer, enhancing ultraviolet detection without the need for external filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter is introduced for ultraviolet light detection, then the detection selectivity is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines the ultraviolet detection function with the existing display pixel structure by integrating the photosensitive layer directly into the pixel electrode configuration. This merging eliminates the need for separate filter structures while achieving the same detection selectivity, thereby reducing device complexity and production cost.
Solution Approach 2:
The pixel electrode structure is designed to serve dual functions: displaying images and detecting ultraviolet light. By making the pixel electrode photosensitive, the same structural element performs both display and sensing functions, eliminating the need for additional dedicated detection components and simplifying the overall device architecture.
2Measurement precision
If a filter is introduced for ultraviolet light detection, then the detection selectivity is improved, but the production process becomes more cumbersome
Solution Approach 1:
The manufacturing process combines the formation of the pixel electrode and the photosensitive layer into a single deposition step. By using the same ITO material for both the pixel electrode and the photosensitive layer, the production process requires only one coating operation rather than separate steps for electrode fabrication and filter integration, significantly simplifying manufacturing.
Solution Approach 2:
The patent utilizes the same material (ITO) with different thickness parameters to achieve different functions. The pixel electrode and photosensitive layer are both made of ITO but with varying thicknesses, allowing differentiation of function through parameter adjustment rather than requiring different materials or additional processing steps.
3Adaptability or versatility
If polycrystalline silicon is used for ultraviolet detection, then the detection function is achieved, but the selectivity for ultraviolet light is poor due to response to both visible and ultraviolet light
Solution Approach 1:
The patent applies a transparent protective layer selectively over the photosensitive layer in specific regions. This creates local quality differentiation where the photosensitive layer exposed in the detection region responds to ultraviolet light, while the covered region maintains display functionality, achieving both detection function and selectivity through spatially differentiated properties.
Solution Approach 2:
The pixel structure is segmented into distinct functional regions: the photosensitive layer for ultraviolet detection and the transparent protective layer for protection and wavelength filtering. This segmentation allows the photosensitive material to maintain its broad spectral response while the protective layer provides selective filtering, achieving both detection capability and selectivity.
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
Simplifies the production process, reduces costs, and improves ultraviolet detection selectivity by using titanium and titanium oxide layers to achieve a high ultraviolet-to-visible light ratio, allowing direct integration of ultraviolet detection on the array substrate.
Implementation Method 1
the first filter layer is disposed on a side of the first buffer layer away from the base substrate and covering the groove; a second filter layer is disposed on a side of the active layer away from the first filter layer
Implementation Method 2
an array substrate, a method for preparing the array substrate, and a display panel... achieves a high selectivity ratio of ultraviolet to visible light detection
Implementation Method 3
utilizing titanium and titanium oxide layers for enhanced reflectivity and selectivity
Implementation Method 4
an active layer disposed on a side of the first filter layer away from the first buffer layer and in correspondence with the first filter layer
Data Source
AI summary
Embodiments of the present disclosure provide an array substrate, a preparation method thereof, and a display panel, where the array substrate includes a first filter layer, an active layer, and a second filter layer. By reflecting the light to the second filter layer through the first filter layer, and then reflecting the light to the active layer through the second filter layer, the active layer can act as a photosensitive unit to meet a requirement for detecting an ultraviolet intensity in the ambient light.