Optical Construction with Bead-Aligned Light Blocking Layer
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Solution Overview
Problem
Optical systems, particularly in applications like fingerprint sensing behind display panels, face challenges with blurred images due to improper imaging optics and inadequate control of angular light distribution.
Innovation Solution
An optical construction featuring a light-blocking layer with through openings aligned to optically transparent beads, which are embedded in a diffusive film, allowing for controlled light transmission and improved image clarity by managing angular light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-blocking layer is used to block ambient light, then image clarity is improved, but light transmission is reduced
Solution Approach 1:
The light-blocking layer is segmented into multiple regions with different optical properties. Through openings are formed in specific regions to allow light transmission, while other regions block light. This segmentation enables simultaneous achievement of image clarity (through controlled light blocking) and sufficient light transmission (through strategic openings).
Solution Approach 2:
Different regions of the light-blocking layer have different optical characteristics. The through openings are positioned to align with specific features (such as fingerprint ridges or display elements), creating local variations in light transmission. This local quality differentiation allows the layer to block ambient light where needed while transmitting light where it is required for imaging.
2Illumination intensity
If through openings are formed in the light-blocking layer to allow light transmission, then light transmission is improved, but structural integrity is reduced
Solution Approach 1:
Instead of creating large openings that would compromise structural integrity, partial openings of optimized size and shape are formed. The openings are carefully controlled to provide sufficient light transmission while maintaining the overall structural strength of the light-blocking layer. The partial action approach balances light transmission needs with structural requirements.
3Measurement precision
If beads are embedded in the diffusive film to control light distribution, then angular light distribution is improved, but manufacturing complexity is increased
Solution Approach 1:
The beads are embedded in the diffusive film through a self-assembly process where the beads automatically arrange themselves in the desired pattern. This self-service approach eliminates the need for complex manufacturing processes to position each bead individually, reducing manufacturing complexity while achieving precise angular light distribution control.
Solution Approach 2:
The optical properties of the diffusive film are controlled by changing parameters such as bead size, bead material, and bead concentration. By adjusting these parameters, the angular light distribution is optimized without requiring complex structural modifications or manufacturing processes. The parameter changes approach simplifies manufacturing while achieving precise optical control.
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
Enhances image clarity and contrast by controlling angular light distribution, preventing ambient light interference and ensuring proper imaging optics for sharper fingerprint images.
Implementation Method 1
a plurality of optically transparent first beads (10) at least partially embedded in a first layer (20)... The bottom-most portions of the first beads and the major bottom surface define a plurality of contact or near contact regions therebetween
Implementation Method 2
A light blocking second layer (40) is disposed on the lens film (100)... For substantially normally incident light having a first wavelength in a predetermined wavelength range, a total optical transmittance of the light blocking layer at the openings is T1 and a total optical transmittance of the light blocking layer in regions between the openings is T2, T1/T2≥10
Data Source
AI summary
An optical construction includes a lens film having a plurality of optically transparent first beads at least partially embedded in a first layer. A light blocking second layer is disposed on the lens film and defines a plurality of through openings therein extending at least partially between opposite major top and bottom surfaces of the second layer. The through openings are aligned to the first beads in a one-to-one correspondence.