OLED Array Substrate Light-Filtering Layer for Fingerprint Accuracy
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Solution Overview
Problem
In display devices integrated with fingerprint recognition, ambient light interferes with the accuracy of fingerprint recognition due to pigment light emitted by biological tissues, which is not effectively filtered by existing technologies.
Innovation Solution
An array substrate is designed with a light-filtering layer positioned distal to the photoelectric conversion layer, filtering light with wavelengths greater than 600 nanometers to reduce interference from pigment light, while allowing other wavelengths to pass through, thereby improving fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-filtering layer is added to filter pigment light, then fingerprint recognition accuracy is improved, but device complexity increases
Solution Approach 1:
The light-filtering layer is segmented into multiple sub-layers with different optical properties. Each sub-layer targets specific wavelength ranges, allowing selective filtering of pigment light while maintaining transparency for other wavelengths. This segmentation enables precise control over light transmission characteristics without requiring a single complex filtering layer.
Solution Approach 2:
The light-filtering layer employs composite material structures combining different optical materials with complementary properties. By integrating materials with varying refractive indices and absorption characteristics, the layer achieves effective pigment light filtering while maintaining overall light transmission. The composite structure allows tuning of optical properties to optimize both filtering performance and device integration.
2Object-affected harmful factors
If the light-filtering layer filters wavelengths greater than 600 nanometers, then interference from pigment light is reduced, but transmission of useful light may be affected
Solution Approach 1:
The light-filtering layer exhibits local quality variations across different wavelength ranges. It is designed with selective optical properties that provide strong filtering specifically in the pigment light wavelength range (>600nm) while maintaining high transmission in other wavelength ranges. This localized filtering approach ensures that harmful pigment light is blocked without unnecessarily attenuating useful light for display and fingerprint recognition functions.
Solution Approach 2:
The optical parameters of the light-filtering layer are precisely tuned to achieve optimal performance. By adjusting the thickness, material composition, and refractive index of the filtering layer, the design achieves maximum attenuation of pigment light wavelengths while minimizing impact on other wavelengths. Parameter optimization allows the layer to differentiate between harmful and useful light based on wavelength characteristics.
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 light-filtering layer effectively reduces the interference of pigment light on fingerprint recognition, enhancing the accuracy of fingerprint recognition by filtering out light with wavelengths greater than 600 nanometers, which are typically emitted by biological tissues.
Implementation Method 1
a transmittance of the light-filtering layer to light in a target band is smaller than or equal to a transmittance threshold, a minimum value of the target band being greater than 600 nanometers
Implementation Method 2
an organic light-emitting diode (OLED) and a photoelectric conversion layer which are disposed on the base substrate
Data Source
AI summary
Disclosed are an array substrate, a method for manufacturing the same, and a display device. The array substrate includes a base substrate and an organic light-emitting diode (OLED), a photoelectric conversion layer and a light-filtering layer which are on the base substrate, wherein the OLED and the light-filtering layer both are on a side, distal from the base substrate, of the photoelectric conversion layer, an orthographic projection of the photoelectric conversion layer on the base substrate is at least partially overlapped with an orthographic projection of the light-filtering layer on the base substrate, the orthographic projection of the photoelectric conversion layer on the base substrate is outside an orthographic projection of the OLED on the base substrate, the light-filtering layer is light transmittable, and a transmittance of the light-filtering layer to light in a target band is smaller than or equal to a transmittance thresholds.