Applied Physics & Modelling - Color Scientist

Deepsky is a privately owned company based in Hong Kong that has been developing new technologies for LED screens for more than ten years. We build the industry’s first end-to-end video processing solution for LED displays:

• Smart IC LED drivers (ASIC) featuring Deepsky’s patented Variable Current Technology, for outstanding HDR picture quality
• FPGA-based gateway boards between the LED drivers and the Ethernet video distribution
• A high-performance Linux GPU processor as screen controller
• OrbitalCam, our robotic precision calibration camera for LED panel opto-electrical characterization in our customers’ factories

Picture quality is the entire point of our stack — and calibration is where it is won. Every LED on a Deepsky screen is individually photographed, measured and corrected.

You will take ownership of our calibration and color-science software: a Python monorepo of about twenty packages — pure algorithm libraries, calibration machine software, and the robotic acquisition layer — that turns camera and spectroradiometer measurements into per-LED corrections rendered live on the wall. This is an end-to-end ownership role: you design the pipeline that runs in production, improve its algorithms, and extend it as our silicon evolves.

The role

Calibrating a display is a physics problem before it is a software problem: how an LED’s emission responds to drive current, how it drifts with temperature, how its light spreads into its neighbours through the optics, how a camera and a spectroradiometer each see it — and how all of this is modelled well enough to correct every LED individually. You will own this physical understanding end to end: the models, the measurement science behind our robotic calibration station, and the Python pipeline that turns both into per-LED corrections rendered live on the wall.

Responsibilities

• Model the display’s physical behaviour: LED emission and non-linearity versus drive current, thermal drift, optical crosstalk between neighbouring LEDs (PSF), angular dependence — and turn these models into per-LED corrections
• Own the measurement science of the calibration station: camera radiometry (exposure, flat-fielding, geometric correction, PSF deconvolution), optical filter characterization, spectroradiometer reference campaigns, and the traceability chain between camera measurements and absolute references
• Design measurement protocols and error budgets: what to measure, at which drive and temperature points, and how noise and systematic errors propagate to the final on-screen color accuracy
• Maintain and extend the Python pipeline that implements the above — acquisition, post-processing, packaging of corrections for the GPU processor, and color-accuracy benchmarks and reports
• Support our operations team during production calibration campaigns

Requirements

• A background in physics, optics, photonics, or measurement science — through degree, research, or equivalent industrial experience
• Strong modelling skills: fitting physical models to noisy measurements, linear algebra, optimization, interpolation, and honest uncertainty/error analysis
• An experimentalist’s rigor: designing measurements, hunting systematic errors, validating results against independent references before trusting them
• Working proficiency in Python/NumPy — your models must become running code, though software is your instrument here, not the job itself
• An autonomous owner: this pipeline is critical to the product, and you will run it, evolve it, and document it for others

Nice to have

• Colorimetry and radiometry (CIE XYZ, chromaticity, ΔE metrics, HDR transfer functions)
• Hands-on experience with optical metrology instruments: spectroradiometers, machine-vision cameras, optical filters
• Image processing / computer vision experience
• Machine-learning experience applied to correction or fitting problems; software engineering practices (CI, packaging, databases)

Organization

Our team works mostly remotely from France and Hong Kong. Our HQ, operations, digital electronics, sales and marketing teams are located in Hong Kong (Tsuen Wan); screen production is in Shenzhen at our partner’s factories. The position can be based in our Hong Kong office or remote; occasional travel to Hong Kong and Shenzhen during special calibration campaigns and new feature tests is part of the job.

Excellent English proficiency is required.

We can sponsor work visa applications in Hong Kong.