Display Screen Sub-Pixel Filters for Fingerprint Detection
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Solution Overview
Problem
Existing display and detection systems with integrated fingerprint sensors face challenges in attenuating reflections while maintaining image sensor functionality, as the antireflection systems, such as polarizers, reduce luminosity and hinder fingerprint detection.
Innovation Solution
The system incorporates a display screen with a stack of layers, including colored filters and absorbing elements that allow specific radiations to pass through while blocking others, and an image sensor capable of detecting these radiations, eliminating the need for an antireflection system with a polarizer, thereby reducing reflections and enhancing fingerprint detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an antireflection system with a polarizer is used, then reflections are attenuated, but image sensor functionality is hindered and luminosity is reduced
Solution Approach 1:
The display screen is divided into first display sub-pixels and second display sub-pixels, where first sub-pixels emit first radiation and second sub-pixels emit second radiation. The image sensor detects reflections of specific radiations from fingerprint ridges and valleys, segmenting the optical paths to enable both antireflection and fingerprint detection functions simultaneously.
Solution Approach 2:
Different colored filters are used in different sub-pixels (first colored filter for first radiation, second colored filter for second radiation). The absorbing elements are strategically positioned to block specific radiations locally, allowing the system to attenuate reflections in certain areas while maintaining transmission in others for sensor detection.
2Object-affected harmful factors
If an antireflection system with a polarizer is used, then reflections are attenuated, but luminosity is reduced
Solution Approach 1:
The system uses different colored filters (first colored filter and second colored filter) that selectively transmit different radiations. By choosing appropriate color combinations, the system can attenuate reflected light while maintaining high luminosity for the emitted display light, as the filters are optimized to pass the emitted radiation wavelengths.
3Object-affected harmful factors
If absorbing elements and colored filters are added to each sub-pixel, then antireflection properties improve, but device complexity increases
Solution Approach 1:
The absorbing elements and colored filters are integrated directly into the display screen structure itself, merging the antireflection function with the display function. This eliminates the need for a separate antireflection system layer, reducing overall device complexity while achieving both display and fingerprint detection capabilities.
Solution Approach 2:
The display screen serves multiple functions simultaneously: it emits display light through the light-emitting components, filters specific wavelengths through the colored filters, absorbs unwanted reflections through the absorbing elements, and allows the image sensor to detect fingerprint reflections. This multi-functionality reduces the need for separate components.
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 configuration improves antireflection properties and maintains image sensor functionality, allowing for effective fingerprint detection with reduced attenuation of the signal and increased contrast, while minimizing the impact on image luminosity.
Implementation Method 1
the first colored filter is capable of letting through the first radiation and of blocking the second radiation, the second colored filter being capable of letting through the second radiation and of blocking the first radiation
Implementation Method 2
the first electrically-conductive tracks being made of a material absorbing the first radiation and the second radiation or being transparent for the first radiation and the second radiation or at least the first display sub-pixels comprising first elements absorbing the first radiation and the second radiation
Implementation Method 3
an image sensor covered with the display screen and capable of detecting the first radiation, the second radiation, or a third radiation
Implementation Method 4
each first display sub-pixel comprising a first light-emitting component capable of emitting a first radiation and covered with a first colored filter
Data Source
AI summary
A display system including a display screen having first and second display sub-pixels where each first display sub-pixel includes a first light-emitting component emitting a first radiation and covered with a first colored filter and first conductive tracks and where each second display sub-pixel includes a second light-emitting component emitting a second radiation and covered with a second colored filter and second conductive tracks. The display system further includes an image sensor detecting the first or second radiation or a third radiation. The first display sub-pixels include first elements absorbing the first radiation and the second radiation and covering the first conductive tracks. The first absorbing elements and/or the first colored filter delimit a first passageway along the stacking direction for the first, second, or third radiation.