Display Assembly Light Scattering Layer for Moiré Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The optical fingerprint recognition in electronic devices with thin displays is prone to moiré patterns due to spatial frequency interference between the light-emitting units and photosensitive pixels, reducing accuracy and user experience.
Innovation Solution
Incorporating a light scattering layer between the base layer and the light source layer in the display assembly, with an opening covered by the light-emitting layer projection and connection regions outside the opening, diffusely reflects light to avoid moiré patterns and enhance fingerprint recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the display is made thinner and lighter, then the device achieves more compact and portable design, but the optical fingerprint module is easily focused on the light-emitting unit causing moiré patterns
Solution Approach 1:
A light scattering layer is introduced as an intermediary component between the light-emitting unit and the optical fingerprint module. This layer scatters the light emitted by the light-emitting unit, preventing direct focus on the light source while maintaining the thin display structure. The scattering layer effectively decouples the optical path, eliminating the moiré pattern caused by the spatial frequency interference between the light-emitting unit and photosensitive pixels.
2Measurement precision
If the light-emitting unit and photosensitive pixels have similar spatial frequency, then the optical fingerprint imaging is achieved, but a moiré pattern consisting of alternating dark and bright regions is formed reducing recognition accuracy
Solution Approach 1:
The light scattering layer changes the optical parameters of the system by altering the light propagation paths. It transforms the coherent light from the light-emitting unit into scattered light with different spatial frequency characteristics. This parameter change breaks the resonance between the light-emitting unit spatial frequency and the photosensitive pixel spatial frequency, eliminating the moiré pattern while preserving the ability to capture fingerprint features.
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 scattering effect reduces optical interference, resulting in evenly distributed bright spots, enhancing the accuracy of fingerprint recognition and improving the user experience by reducing the optical fingerprint recognition.
Implementation Method 1
Based on the principle of light scattering, when light on a side of the light-emitting layer toward the base layer is emitted from an edge of the opening, diffuse reflection occurs on the light scattering layer to form divergent light in different directions.
Implementation Method 2
diffuse reflection occurs on the light scattering layer to form divergent light in different directions
Data Source
AI summary
Embodiments of this application provide an electronic device and a display assembly and a manufacturing method therefor. A light scattering layer is arranged between a base layer and a light source layer. An opening is provided on the light scattering layer. A projection region of a light-emitting layer on the light scattering layer covers the opening, and a projection region of a connection region between a non-light-emitting layer and the light-emitting layer on the light scattering layer is located outside the opening. In this way, a moiré pattern under a screen is effectively reduced or avoided, so that accuracy of fingerprint recognition is enhanced, thereby greatly improving use performance and user experience.