Enhancing Consumer Electronics Image Quality Through Precision Optical Scattering Measurements
In the hyper‑competitive world of consumer electronics-spanning smartphone cameras, CMOS image sensors (CIS), and high‑resolution displays, optical performance has become a critical differentiator. As design cycles shrink and expectations rise, understanding how materials and surfaces scatter light is essential for ensuring peak image quality, robust manufacturing tolerances, and reliable device performance.
Optical scattering measurements provide engineers with quantitative insight into how light interacts with optical surfaces and mechanical structures. These measurements help identify defects, validate material selection, and refine optical simulations used in product development.
Optical Scattering Measurements: Why They Matter
We can highlight two major benefits of optical scattering measurement:
- Improved research & development: Engineers can compare the scattering behavior of various materials and surface treatments, enabling more informed design decisions early in the development cycle.
- Better quality control: Manufacturers can identify defects originating from fabrication steps or mechanical design elements and correct them before they impact final device performance.
For consumer electronics, where production volumes are massive and tolerances are tight, this dual-purpose value is particularly impactful.
Optical Scattering Measurements: How scattering measurements can be performed
The quantity which characterizes scattering is the Bidirectional Scattering Distribution Function (BSDF). It describes how light is scattered (reflected and transmitted) from a surface as a function of both illumination direction and observation direction. BSDF provides a full angular description of reflected/transmitted light, allowing engineers to identify diffuse, glossy, specular, or retro‑reflective behavior.
Keysight Measurement Services address these challenges by providing access to advanced optical scattering instruments operated by experienced BSDF specialists. Customers benefit from:
- Calibrated and traceable measurement setups
- Optimized configurations for ultra‑low reflectance materials
- Expert data analysis and reporting
- High confidence results suitable for R&D, qualification, and supplier comparison
This service‑based approach allows engineers to obtain high‑quality scattering data without the complexity of developing and maintaining in‑house BSDF metrology capabilities.
At the core of Keysight’s optical scattering measurement service is the REFLET 180S goniophotometer. The REFLET 180S is designed for precise angular‑resolved BSDF measurements. This level of precision is crucial when optimizing designs for camera modules, CIS arrays, or display optics.
Figure 1: Goniophotometer REFLET 180S and its capabilities
In addition, Keysight’s scattering measurements integrate seamlessly with their optical design software including CODE V, LightTools, and other tools acquired from the former Synopsys Optical Solutions Group, to improve simulation fidelity. Modern optical engineering relies heavily on simulation; ray tracing, stray light analysis, illumination design, and photonic modeling all require accurate material and surface data. High‑quality input data results in more accurate virtual prototypes, fewer physical iterations, and reduced development time-crucial advantages in consumer markets where release schedules are tight.
Applications in Consumer Electronics Engineering
Stray Light Analysis for Camera Modules
CIS modules are highly sensitive to micro‑scale scattering effects caused by passivation layers, microlenses, or pixel‑level fabrication variations. Stray light coupling between pixels can contribute to lens shading errors, color cross‑talk, and reduced dynamic range.
With precise scattering measurements, engineers can compare the behavior of various surface types or coatings and select materials with optimal performance. This offers significant benefits in R&D as well as in quality control for high‑volume manufacturing. By incorporating measured BSDF data into the system simulation, engineers can more accurately predict and mitigate these effects.
Figure 2: Example with a CMOS camera; Picture of the sample (a) Measurement (b) Design for optical simulation (c) Simulation result from measurement (d)
Displays (LCD, OLED, Micro‑LED)
Display optics, particularly anti‑reflection layers, diffusers, light guides, and microlens arrays, depend heavily on controlled scattering characteristics. Small deviations from the intended scattering profile can lead to luminance non‑uniformity, color shifts, or artifacts visible to the end‑user.
Optical scattering data helps engineers validate these optical elements, detect subtle defects, and fine-tune simulation models for next‑generation display modules. The ability to characterize transmitted and reflected light under precise angular and spectral conditions enables more accurate prediction of visual performance.
Figure 3: Measurements of 2 different displays
Conclusion
As consumer electronics continue to push the boundaries of optical performance-higher resolution cameras, more sensitive CIS modules, brighter and more uniform displays-the importance of understanding and controlling optical scattering cannot be overstated.
Optical scattering measurements offer optical engineers a powerful toolkit for improving design accuracy, detecting defects, and validating materials. By combining precise measurement capabilities with an integrated suite of optical design software, Keysight provides an end‑to‑end solution that accelerates innovation in the consumer electronics industry.
With scattering data incorporated directly into design workflows, engineers can build better optical systems faster, ensuring that the next generation of consumer devices delivers the clarity, brightness, and visual quality users expect.
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