How bright of luminance is needed for outdoor commercial display?

Eun, Lee Hee; Hong, Kim Jae

doi:10.1109/icce-berlin.2016.7684740

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…As a result, the direct GaN green has a higher purity green light [13]. Furthermore, the display brightness [14] and its power efficiency (Lumens/Watts) are two essential parameters allowing, or not, outdoor applications and long battery life. Since the thermal dissipation remains a complicate exercise in very compact systems, increasing the light efficiency enables reducing the display working temperature [15].…”

Section: Lens Proposed Solutionmentioning

confidence: 99%

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Design and Modeling of Light Emitting Nano-Pixel Structure (LENS) for High Resolution Display (HRD) in a Visible Range

Eisenfeld

Karsenty

2020

Nanomaterials

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LENS (Light Emitting Nano-pixel Structure), a new nano-metric device, was designed, simulated, and modeled for feasibility analysis, with the challenge of combining high resolution and high brightness for display, essentially adapted for Augmented Reality (AR) and Virtual Reality. The device is made of two parts: The first one is a reflective nano-cone Light Emitting Device (LED) structure to reduce the Total Internal Reflection effects (TIR), and to enable improved light extraction efficiency. The second part is a Compound Parabolic Concentrator (CPC) above the nano-LED to narrow the outgoing light angular distribution so most of the light would be “accepted” by an imaging system. Such a way is drastically limiting any unnecessary light loss. Our simulations show that the total light intensity gain generated by each part of the pixel is at least 3800% when compared to a typical flat LED. It means that, for the same electrical power consumption, the battery life duration is increased by 38. Furthermore, this improvement significantly decreases the display thermal radiation by at least 300%. Since pixel resolution is critical to offer advanced applications, an extensive feasibility study was performed, using the LightTools software package for ray tracing optimization. In addition to the simulation results, an analytical model was developed. This new device holds the potential to change the efficiency for military, professional and consumer applications, and can serve as a game changer.

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Section: Lens Proposed Solutionmentioning

confidence: 99%

“…The usual brightness in daylight is around 3000 nits [14]. In an HMD, to be visible in daylight conditions, the image should be projected with a similar brightness.…”

Section: High Brightness Conical Emitter Layermentioning

confidence: 99%

Design and Modeling of Light Emitting Nano-Pixel Structure (LENS) for High Resolution Display (HRD) in a Visible Range

Eisenfeld

Karsenty

2020

Nanomaterials

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“…2 Furthermore, the direct-sunlight illumination makes reading out of doors challenging. 4 To increase the readability of content, high-brightness backlight units (BLUs) are often used for outdoor LCDs. 4,5 However, the high-brightness BLUs will generate a large amount of heat and accelerate the aging of materials and devices in panels.…”

Section: Introductionmentioning

confidence: 99%

“…4 To increase the readability of content, high-brightness backlight units (BLUs) are often used for outdoor LCDs. 4,5 However, the high-brightness BLUs will generate a large amount of heat and accelerate the aging of materials and devices in panels. 3 Therefore, compared with indoor products, outdoor displays demand better long-term stability and reliability against environmental changes.…”

Section: Introductionmentioning

confidence: 99%

P‐87: New Liquid Crystal Materials for Outdoor Displays

Li,

Liu,

Wang

et al. 2023

Symp Digest of Tech Papers

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Outdoor displays are widely applied in markets, rail transits and bus stations as a replacement for traditional posters. Due to the relatively harsh operation environment, materials for outdoor displays, such as liquid crystals (LCs), require better stability and reliability than normal indoor products. Herein, to evaluate the difference in reliability and optical properties between normal LCs and outdoor LCs, three LC materials including one normal LC, named LC‐Ref, and two outdoor LCs, LC‐1 and LC‐ 2, were assessed. Compared with LC‐Ref, LC‐1 and LC‐2 displayed wider nematic phase ranges and better reliability. Even though outdoor LCs exhibited right‐shifted V‐T curves, LC‐1 and LC‐2 could achieve similar transmittance ratios with LC‐Ref utilizing high driving voltage. Moreover, utilizing high‐ brightness backlight units (BLUs), outdoor LCs showed faster Toff than LC‐Ref with normal BLUs. Overall, LC‐1 and LC‐2 are potentially excellent LC materials for outdoor displays.

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“…For example, a monochromatic green nano-LED is usually based on InGaN/GaN materials ( Table 1 ), since a direct GaN-based green LED emits a narrower spectrum than the phosphor converted green LED [ 12 ]. Two additional important parameters are display brightness [ 13 ] and power efficiency, since they allow—or do not allow—outdoor applications as well as a long battery life. Another challenge to overcome is thermal dissipation [ 14 ] while increasing the light efficiency and reducing the whole display working temperature.…”

Section: Introductionmentioning

confidence: 99%

Performance Enhancement and Applications Review of Nano Light Emitting Device (LED)

2020

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A nano light emitting device (LED) has been developed and is presented. This new LED, entitled LENS (Light Emitting Nano-pixel Structure), is a new nano-pixel structure designed to enable high-resolution display. It serves as the building block of a more complex structure called LENA (Light Emitting Nano-pixel Array), dedicated to nano-display applications, such as augmented and virtual reality (AVR). Previously designed and studied with a platform for ray tracing optimization, a complementary simulations study was performed using the Comsol Multi-Physics Platform in order to check for opto-electronics performance and physical nanoscale investigations. In addition to the physical complementary analysis, several studies have focused on optimizations: optimal geometry for a pixel (cylindrical or conical shape), and wavelength adaptation (optical communication). In addition to numerical simulation results, an analytical model has been developed. This new device holds the potential to enhance the light efficiency for military, professional and consumer applications, and can serve as a game changer in the world of nano-displays with high resolution.

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How bright of luminance is needed for outdoor commercial display?

Cited by 5 publications

References 5 publications

Design and Modeling of Light Emitting Nano-Pixel Structure (LENS) for High Resolution Display (HRD) in a Visible Range

Design and Modeling of Light Emitting Nano-Pixel Structure (LENS) for High Resolution Display (HRD) in a Visible Range

P‐87: New Liquid Crystal Materials for Outdoor Displays

Performance Enhancement and Applications Review of Nano Light Emitting Device (LED)

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