Searched for: subject%3A%22luminance%22
(1 - 19 of 19)
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Kamijo, T. (author), de Winter, S. (author), Panditha, P. (author), Meulenkamp, E. (author)
The transparent conductive electrode (TCE) is a key component of organic light-emitting diodes (OLEDs). High-resolution printed metal grids are a promising alternative to indium tin oxide (ITO). We present results for evaporated OLEDs with a printed copper (Cu) grid with line width below 3 μm. The use of a thick doped hole injection layer (HIL)...
article 2022
document
Koutsoumpis, A. (author), Economou, E. (author), van der Burg, E. (author)
In Helmholtz’s illusion, a square with horizontal stripes appears taller than an identical square with vertical stripes. This effect has also been observed in experiments with human stimuli, where a human figure wearing a dress with horizontal stripes appears thinner than a drawing clad in vertical stripes. These findings do not agree with the...
article 2021
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Prakasam, V. (author), Tordera, D. (author), di Giacomo, F. (author), Abbel, R. (author), Langen, A. (author), Gelinck, G. (author), Bolink, H.J. (author)
Halide perovskites have been gaining considerable attention recently for use in light-emitting applications, due to their bandgap tunability, color purity and low cost fabrication methods. However, current fabrication techniques limit the processing to small-area devices. Here, we show that a facile N 2 gas-quenching technique can be used to...
article 2019
document
Herrmann, A. (author), Erich, S.J.F. (author), Ven, L.G.J.V.D. (author), van Driel, W.D. (author), van Soestbergen, M. (author), Mavinkurve, A. (author), de Buyl, F. (author), Adan, O.C.G. (author)
conference paper 2017
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Genoe, J. (author), Obata, K. (author), Ameys, M. (author), Myny, K. (author), Ke, T.H. (author), Nag, M. (author), Steudel, S. (author), Schols, S. (author), Maas, J. (author), Tripathi, A. (author), Van Der Steen, J.-L. (author), Ellis, T. (author), Gelinck, G.H. (author), Heremans, P. (author)
The efficiency of small-molecule OLED devices increased substantially in recent years, creating opportunities for power-efficient displays, as only light is generated proportional to the subpixel intensity. However, current active matrix OLED (AMOLED) displays on foil do not validate this power-efficient advantage, as too much power is lost in...
conference paper 2014
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Ye, H. (author), Koh, S.W. (author), Yuan, C. (author), van Zeijl, H. (author), Gielen, A.W.J. (author), Lee, S.W.R. (author), Zhang, G. (author)
The drive of increased electrical currents to achieve high luminous output for phosphor-converted white light-emitting diodes (PW-LED) has led to a series of thermal problems. The light performance of PW-LED is affected by the heat generated by the two major sources in a package/module: chip(s) and phosphors. In this work, spectral shift and...
article 2014
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Harkema, S. (author), Kicken, R.A.H.J. (author), Langeveld-Voss, B.M.W. (author), van Mensfoort, S.L.M. (author), de Kok, M.M. (author), Coehoorn, R. (author), TNO Industrie en Techniek (author)
A study is carried out of the external quantum efficiency (EQE) of organic light-emitting diodes (OLEDs) based on blue-emitting fluorene polymers containing hole-transporting units. For that purpose, 10 polymers containing a systematically varied amount of two different (benzidine-based and phenoxazine-based) aromatic amine comonomers are...
article 2010
document
Court, A.J. (author), TNO Industrie en Techniek (author)
The Atmospheric-Space Interactions Monitor (ASIM) consists of a suite of instruments to make observations of Transient Luminous Events (TLEs) and Terrestrial Gamma-ray Flashes (TGFs). The optical part of the payload is called the Multi-Spectral Modular Imaging Array (MMIA) and consists of a combination of a camera units and photometers. The...
conference paper 2009
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TNO Defensie en Veiligheid (author), Alferdinck, J.W.A.M (author), van der Leden, N. (author)
In a psychophysical experiment the adequate luminous intensities for traffic lights were measured as function of time of day, colour, size and three perception criteria minimum, optimum, and maximum. By day the traffic lights were adjusted at average luminous intensities of 124 cd, 369 cd, and 616 cd for the perception criteria minimum, optimum,...
conference paper 2009
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Varady, G. (author), Freiding, A. (author), Eloholma, M. (author), Halonen, L. (author), Walkey, H. (author), Goodman, T. (author), Alferdinck, J.W.A.M. (author), TNO Defensie en Veiligheid (author)
The authors represent a research consortium which has adopted a task performance based approach for nighttime driving to obtain mesopic spectral sensitivity functions. This study describes investigations based on discrimination threshold techniques and compares the results with those obtained from detection threshold measurements. It forms a...
article 2007
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Eloholma, M. (author), Ketomaki, J. (author), Halonen, L. (author), Walkey, H. (author), Goodman, T. (author), Alferdinck, J.W.A.M. (author), Bodrogi, P. (author), TNO Defensie en Veiligheid (author)
Achromatic thresholds are measured at three sites to investigate the effects of light spectrum on achromatic detection thresholds in the mesopic region. The results of measurements using quasi-monochromatic targets reveal spectral sensitivity functions with two or three peaks, a so-called ‘chromatic effect’ which is assumed to be due to the...
article 2007
document
Vladusich, T. (author), Lucassen, M.P. (author), Cornelissen, F.W. (author), TNO Defensie en Veiligheid (author)
article 2006
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Alferdinck, J.W.A.M. (author), TNO Defensie en Veiligheid (author)
During night-time driving hazardous objects often appear at mesopic light levels, which are typically measured using light meters with a spectral sensitivity that is only valid for photopic light levels. In order to develop suitable mesopic models a target detection experiment was performed in a driving simulator. While subjects drove along a...
article 2006
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Vladusich, T. (author), Lucassen, M.P. (author), Cornelissen, F.W. (author), TNO Defensie en Veiligheid (author)
How do induced brightness and darkness signals from local and remote surfaces interact to determine the final achromatic color percept of a target surface? An emerging theory of achromatic color perception posits that brightness and darkness percepts are computed by weighting and summing the induction signals generated at edges in a scene. This...
article 2006
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Lucassen, M.P. (author), Walraven, J. (author), TNO Defensie en Veiligheid (author)
In a preceding study we measured human color constancy in experimental conditions in which simulated illuminants and surface colors were varied in the chromatic domain only. Both illumination level and sample re.ectance were fixed in that study. In the present study we focus on the achromatic dimension, both with respect to luminance contrast ...
article 2005
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TNO Defensie en Veiligheid (author), Bijl, P. (author), Lucassen, M.P. (author)
If images from multiple sources (e.g. from the different bands of a multi-band sensor) are displayed in color, Signal and Noise may appear as luminance and color differences in the image. As a consequence, the perception of color differences may be important for Target Acquisition performance with fused imagery. Luminance and color can be...
conference paper 2005
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Theeuwes, J. (author), Alferdinck, J.W.A.M. (author), TNO Technische Menskunde (author)
The present study investigated the influence of layout factors on the effectiveness of the center high-mounted stop lamp (CHMSL) during day and night conditions. In particular, the study evaluated the effect of a vertical separation between the CHMSL and the horizontal plane of conventional stop lamps and the effect of a single strip of lamps...
article 1995
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Walraven, J. (author), Werner, J.S. (author)
The locus of unique white was measured for two observers over a wide range of stimulus intensities, using both direct matching and absolute judgements. Chromaticity coordinates of each observer's unique white were found to be invariant over a range of about 4 log units. This result is discussed in the context of the class of models that explain...
article 1991
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Vos, J.J. (author), Estevez, O. (author), Walraven, P.L. (author), Instituut voor Zintuigfysiologie TNO (author)
New action spectra are derived for the foveal cones on the basis of three assumptions: (1) the Stiles-Burch (1959) colorimetric data are better than CIE 1931; (2) the long wavelength flanks of the dichromatic luminosity functions offer better anchorage than the confusion loci; and (3) the relative mutual heights per receptor can be derived from...
article 1990
Searched for: subject%3A%22luminance%22
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