Fachvorträge

Next generation OLEDs displays have in principle endless contrast ratios due to their emittive nature. However, in practice OLED displays show non-uniformities at very low luminance which have to be measured and corrected in order to maintain constant contrast.

In this presentation, uniformity measurements at very low luminance will be presented and results from displays from a variety of manufacturers will be compared.

Next generation OLEDs displays have in principle endless contrast ratios due to their emittive nature and their ability to completely turn off pixels. This makes them ideal in applications that require low display luminance like use in dark/nighttime conditions.

Novel VCSEL arrays require spatial testing of the whole ensemble as well as of the single emitters in the near-field. Such optical measurements must be calibrated, corrected for polarization dependency and traceable to ensure minimum error budgets for eye safety evaluation.

Although VCSELs are intrinsically single-longitudinal mode devices, they usually show complex polarization characteristics. Most VCSEL are not designed to emit in a single polarization state, there is no control about the polarization angle. The light emitted by the VCSEL typically show a complicated polarization, even within one emitter and abrupt polarization switching can be observed when temperature or bias current is changed. In this presentation we show a method of measuring spatially resolved polarization characteristics of VCSELs. This is achieved using a combination of polarization filtered microscope optics and a CMOS camera.

Novel display technologies for AR/VR/MR devices require distinct tests to control quality during development and in production. Sharpness and contrast tests are particularly important due to the complex overlay of real and augmented images. Clear and immersive perception of the augmented or virtual reality requires optimal optical differentiation between different display contents. Typically, the modulation transfer function (MTF) acts a measure for sharpness and contrast. For accurate MTF measurement, an imaging test system should be based on a lens system that mimics the human eye system and have a similar-sized entrance pupil in front of the lens.

VCSEL-based sensor technology supports innovative applications. As VCSELs have special properties, in contrast to other typical laser sources, their characterization is more complex.

Die Darstellung virtueller Bilder mit Near-Eye Displays (NEDs) kann eine Vielzahl zu überprüfender Effekte aufweisen, wie z.B. Verzerrungen und Unschärfen. In seinem Vortrag erläutert Dr. Cameron Hughes, warum ein spektral optimiertes Kamerasystem wie die LumiTop ideal für schnelle und präzise Produktionstests dieser Displays geeignet ist.

Während des EPIC Members New Product Release, präsentierte Dr. Karthik Iyer, Programm Manager bei Instrument Systems, unsere Nahfeld-Kamera VTC 4000 für die schnelle und präzise Analyse von VCSEL-Arrays.

Nowadays, the pandemic situation caused by the COVID-19 virus inspired many companies, research institutes and lighting designers to adopt UV radiation as a new tool in their projects and research. The promising germicidal effect of the UVC radiation also on the Coronavirus raises the question of the reliable measurement of the UV radiation. However, this complex task needs an expertise and appropriate equipment.

Die aufstrebende μLED Displaytechnologie verspricht hohe Kontraste, schnelle Antwortzeiten, ein breites Farbspektrum, geringen Energieverbrauch und Langlebigkeit. Jedoch ist die Technologie nicht nur eine Herausforderung hinsichtlich des Massentransfers der μLED vom Wafer auf das Display, sondern auch hinsichtlich der massiven Parallelisierung optischer Qualitätskontrolle in unterschiedlichen Fertigungsschritten.

Nowadays, the pandemic situation caused by the COVID-19 virus inspired many companies, research institutes and lighting designers to adopt UV radiation as a new tool in their projects and research. The promising germicidal effect of the UVC radiation also on the Coronavirus raises the question of the reliable measurement of the UV radiation. However, this complex task needs an expertise and appropriate equipment.

Novel display technologies for AR/VR/MR devices require advanced imaging systems to control quality during assembly and to calibrate the device. Such calibration yields an optimal match of left and right eye and allows color management for an accurate match of real world and virtual objects. For accurate measurement, such an imaging system should be based on a lens system that mimics the human eye system and have a similar-sized entrance pupil in front of the lens. Traditionally two approaches have been proposed:

Novel display technologies for augmented and virtual reality (AR/VR/MR/XR) devices, like Head-Mounted-Devices and Head-Up-Displays, require advanced imaging systems and calibration to control quality during assembly to accurately match the real world and virtual objects. We demonstrate and compare advantages of goniometric sampling spot measurements and camera based imaging solutions.

VCSELs have special properties in contrast to other typical laser sources. As a result, VCSEL eye safety evaluation is more complex and a couple of additional aspects have to be considered that would not apply for "normal" lasers. Consequently, the validation of a VCSEL's laser class is not trivial, and even more so because an easily understandable guideline for the assessment of VCSEL safety has not yet been published.

Datum: 2. Dezember, 2020

Zeit: 17:15 (CET)

LpS Digital 2020

China International Optoelectronic Exposition

IEEE OGC Conference

Virtuelles Event

Freitag 11. September, 2020

Photonics Germany @ CIOE 2020

Datum: 10. September, 2020

Zeit: 13:00 – 17:00 Shenzhen

Ort: World Exhibition & Convention Center ∙ Konferenzraum 2, Halle 1

SID Display Week 2020, virtual event

Spatial Uniformity Display Measurement, Session 71.3

Donnerstag, 6. August 2020

SID Display Week 2020, virtual event

Display Measurement Standards I, Session 50.3

Donnerstag, 6.August, 2020

edc 2020

Nürnberg, Deutschland

Mittwoch, 26. Februar 2020, 16:35 - 16:55 Uhr, Session 6 Display Glass & Measurements

SSL China 2019

Tuesday November 26, 2019 11:40am

Shenzhen Convention and Exhibition Center (5th Floor Peony Hall), China

Lux et Color Vesprimiensis

Völgyikút Ház, Veszprém, Hungary

Donnerstag, 10. Oktober 2019, 16:20 Uhr

LED professional Symposium + Expo

Seestudio, Opera House Bregenz, Österreich

Donnerstag, 26. September 2019, 11:30-12:00 Uhr

SID Vehicle Displays and Interfaces 2019

Burton Manor Conference Center, Livonia, MI, USA

Mittwoch, 25. September 2019, 9:15 – 9:35 Uhr, Session 5.4

EuroDisplay 2019

Minsk, Belarus, Stork Room 1, O-43

Donnerstag, 19. September 2019, 10:05 Uhr, Session 7

CIE 2019 29th Quadrennial Session

Washington DC, USA

Dienstag, 18. Juni 2019, 09:20-10:20 Uhr, Session PA3-2

SID Display Week

San Francisco Moscone Center, CA, USA, Raum LL20A

Session 50.1, Co-Chair: Jürgen Neumeier (Instrument Systems GmbH)

Donnerstag, 16. Mai 2019, 09:00-10:20 Uhr

ICDT International Conference on Display Technology 2019

Kunshan, Suzhou, China

Donnerstag, 28. März 2019, 17:40 -18:00 Uhr