High-Luminance Mid-Air Image Display for Outdoor Viewing by Focusing Sunlight

The mid-air image is a very powerful method for presenting computer graphics in a real environment, but it cannot be used in bright locations owing to the decrease in brightness during the imaging process. Therefore, to form a mid-air image with a high-brightness light source, a square pyramidal mirror structure was investigated, and the sunlight concentration was simulated. We simulated the tilt angle and combination angle of the condenser as parameters to calculate the luminance of the surface of a transparent liquid crystal display. The light collector was installed at 55∘ from the horizontal plane and mirror. A high level of illumination was obtained when these were laminated together at an angle of 70∘. To select a suitable diffuser, we prototyped and measured the brightness of the mid-air image with an LED lamp to simulate sunlight in three settings: summer solstice, autumnal equinox, and winter solstice. The maximum luminance of the mid-air image displayed by collecting actual sunlight was estimated to be 998.6 cd/m2. This is considerably higher than the maximum smartphone brightness to allow for outdoor viewing, and it can ensure fully compatible visibility.

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Highly efficient nondoped blue organic light-emitting diodes with high brightness and negligible efficiency roll-off based on anthracene-triazine derivatives

Journal of Materials Chemistry C ◽

10.1039/c9tc05040j ◽

2019 ◽

Vol 7 (47) ◽

pp. 14881-14888 ◽

Cited By ~ 9

Author(s):

Futong Liu ◽

Xiaxia Man ◽

Hui Liu ◽

Jiarui Min ◽

Shiyuan Zhao ◽

...

Keyword(s):

Light Emitting Diodes ◽

Organic Light Emitting Diodes ◽

Maximum Luminance ◽

High Brightness ◽

Light Emitting ◽

Highly Efficient ◽

Organic Light ◽

Triazine Derivatives

A nondoped device based on the PIAnTAZ emitter shows blue electroluminescence with a maximum EQE of 7.96%, a maximum luminance of 58 675 cd m−2 and negligible efficiency roll-offs.

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Highly efficient dual-core derivatives with EQEs as high as 8.38% at high brightness for OLED blue emitters

Journal of Materials Chemistry C ◽

10.1039/c9tc04603h ◽

2019 ◽

Vol 7 (46) ◽

pp. 14709-14716 ◽

Cited By ~ 5

Author(s):

Seokwoo Kang ◽

Hyocheol Jung ◽

Hayoon Lee ◽

Sunwoo Park ◽

Joonghan Kim ◽

...

Keyword(s):

High Efficiency ◽

High Luminance ◽

High Brightness ◽

Highly Efficient ◽

Fluorescent Materials ◽

Blue Emitters ◽

Dual Core ◽

Very High

Three blue fluorescent materials were newly synthesized. A device doped with p-TPA-AP-TPA displayed a very high efficiency of 9.14 cd A−1 and an EQE of 8.38% at a high luminance of 5000 cd m−2.

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Fabrication of High Performance Light Guide Plate and New Design for High Luminance

Volume 10: Micro and Nano Systems ◽

10.1115/imece2010-40326 ◽

2010 ◽

Author(s):

Takaya Fujimoto ◽

Kenji Yamashita ◽

Satoshi Nishida ◽

Daiji Noda ◽

Tadashi Hattori

Keyword(s):

High Performance ◽

Light Guide ◽

Liquid Crystal Display ◽

Light Emitting Diode ◽

High Luminance ◽

Light Emitting ◽

Light Guide Plate ◽

Guide Plate ◽

Average Luminance ◽

Point Light

Recently, LED (Light Emitting Diode) is paid to attention as a new source of light. However, it doesn’t turn to shine on a wide area efficiently because LED is a point light. Then, the method of the light guide plate technology used for the liquid crystal display etc, and use as the LED lighting is examined. A minute reflection dots exists bottom of the light guide plate, system is such that light comes out from the surface because the light that hits the dots break a total reflection condition. In our laboratory, the function of the diffusion seat and the condensing prism seat that is complete parts of the lighting panel was involved by optimizing shape and the arrangement of the dots, and it works on the research of the light guide plate where uniform luminescence is enabled. In the process of study, it has been understood that luminance increases by increasing the number of dots, too. Therefore, an accumulating method of piling up two or more light guide plates was proposed as a method of achieving high luminance for highly effective lighting usage, and the device was analyzed with an optical simulator. As a result of optimization, the average luminance has improved by 15%. We are starting to fabricate this high luminance light guide plate by accumulating method. If this piled light guide plate is completed and luminance is improved in accordance with the simulation, it will be possible to convert it to a higher luminance light guide plate.

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Mississippian Solstice Shrines and a Cahokian Calendar: An Hypothesis Based on Ethnohistory and Archaeology

North American Archaeologist ◽

10.2190/t3nv-350x-d58u-fw3b ◽

1988 ◽

Vol 8 (3) ◽

pp. 227-247 ◽

Cited By ~ 5

Author(s):

Patricia J. O'Brien ◽

William P. McHugh

Keyword(s):

Full Moon ◽

The Sun ◽

Summer Solstice ◽

The Moon ◽

Winter Solstice ◽

Vernal Equinox ◽

Religious Ritual ◽

Autumnal Equinox ◽

New Moon ◽

Using Data

This article examines the hypothesis that early Middle Mississippians had a calendric system which tied agriculture and religious ritual together. It also suggests that to that end they built solstice shrines as a means of recording the passage of time through the behavior of the sun and the moon. Using data from structures having possible astronomical alignments, from historic-ethnographic-linguistic sources, and from agricultural planting cycles, a “Cahokian calendar year” is constructed. The year begins with the summer solstice and the Great Busk ceremony. At the next full moon the “great corn” is planted to be harvested at the autumnal equinox. At the winter solstice winter begins while the vernal equinox is marked by a ritual for the Great Sun, their ruler. At the next new moon after that rite a “little corn” is planted which is harvested at the Great Busk. In their five-day, thirteenth month, just before the Busk, all the fires in the society are extinguished to be relit at the summer solstice Great Busk ceremony.

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Color sound symbolism in natural languages

Language and Cognition ◽

10.1017/langcog.2019.35 ◽

2019 ◽

Vol 12 (1) ◽

pp. 56-83 ◽

Cited By ~ 1

Author(s):

NIKLAS JOHANSSON ◽

ANDREY ANIKIN ◽

NIKOLAY ASEYEV

Keyword(s):

Cognitive Processes ◽

Color Naming ◽

Sound Symbolism ◽

Acoustic Measurements ◽

High Luminance ◽

Natural Languages ◽

High Brightness ◽

International Phonetic Alphabet ◽

Textual Data ◽

Sound Color

abstractThis paper investigates the underlying cognitive processes of sound–color associations by connecting perceptual evidence from research on cross-modal correspondences to sound symbolic patterns in the words for colors in natural languages. Building upon earlier perceptual experiments, we hypothesized that sonorous and bright phonemes would be over-represented in the words for bright and saturated colors. This hypothesis was tested on eleven color words and related concepts (red–green, yellow–blue, black–white, gray, night–day, dark–light) from 245 language families. Textual data was transcribed into the International Phonetic Alphabet (IPA), and each phoneme was described acoustically using high-quality IPA recordings. These acoustic measurements were then correlated with the luminance and saturation of each color obtained from cross-linguistic color-naming data in the World Color Survey. As expected, vowels with high brightness and sonority ratings were over-represented in the words for colors with high luminance, while sonorous consonants were more common in the words for saturated colors. We discuss these results in relation to lexicalization patterns and the links between iconicity and perceptual cross-modal associations.

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