Browse Topic: Head-up displays
Passive fatigue can cause accidents with automated and regular vehicles. A proof-of-concept prototype [made with light-emitting diode (LED) matrices and white LED (WLED)] and a preliminary comparative usability test (N = 7) are used to study whether the active manipulation of simulated weather cues can be a potential countermeasure to passive fatigue. Participants rated system suitability, system impression, and their fatigue level similarly when they viewed a weather windshield heads-up display (HUD) versus a speedometer windshield HUD [no significant differences found and relatively small 95% confidence interval (CI) ranges around 0]. Qualitative analysis of interviews found that participants saw the potential value of the weather display and that display placement, dynamic graphics, and user activation were commonly mentioned themes. These results suggest the concept is theoretically possible, though further work is needed to prove the concept in practice.
This SAE Aerospace Recommended Practice (ARP) provides criteria for the design, installation, operation, and training aspects of head-up display (HUD) systems in transport category aircraft, with emphasis on pilot interface and operational requirements. The recommendations apply to permanently installed (including stowable) HUDs that display primary flight information, including those integrating enhanced flight vision system (EFVS) imagery. The intent is to ensure HUDs are designed and used in a manner that improves pilot situational awareness and flight technical performance across all phases of flight, up to and including low-visibility operations. While technical design standards (optical performance, hardware specs, etc.) are defined in documents like ARP5288 and AS8055, this document focuses on pilot usage considerations and human factors. HUD systems addressed here are typically designed to support a fail-passive operational concept applicable to Category III instrument approach operations, where approved, though many recommendations also apply to HUD usage for Category I and II operations and other phases of flight. Devices such as head-worn displays are not specifically covered, though future provisions may consider “through-display” wearable systems as technology matures.
Ambient light reflecting off internal components of the car, specifically the Head-Up Display (HUD), creates unwanted reflections on the Windshield. These reflections can obscure the driver's field of view, potentially compromising safety and reducing visual comfort. The extent of this obscuration is influenced by geometrical factors such as the angle of the HUD and the curvature of the Windshield, which need to be analyzed and managed. The primary motivation is to improve driver safety and visual comfort. This is driven by the need to address the negative impact of ambient light reflecting off Head-Up Displays (HUDs), which can impair visibility through the Windshield. There is a need for tools and methods to address this issue proactively during the vehicle design phase. This study employs a tool-based modeling method to trace the pathways of ambient light from its source, reflecting off the HUD, and onto the Windshield using a dimensional modeling tool. It focuses on: Geometrical surfaces (specifically HUD angle and Windshield curvature) Modeling the pathways of ambient light from its source, reflecting off the HUD, and onto the Windshield using the dimensional modeling tool Measuring and analyzing the resulting areas of reflection caused within the driver's field of view. The method aims to evaluate the extent of disruption or obscuration within the driver's field of view caused by the reflections in millions of vehicles.
We present the flight testing and integration of the Microsoft HoloLens 2 as a head-worn display (HWD) in DLR's research helicopter. Building on its successful use in a helicopter simulator, initial flight tests confirmed its feasibility in a real helicopter. Current tests focused on system optimization, with head tracking identified as the critical component for hologram stability. Since the HoloLens' inside-out tracking fails in moving vehicles, it was fused with an external infrared tracker, automatically calibrated via an optimization approach adaptable to various trackers and mounting positions. A test pilot with HWD experience rated the system as fully functional, enabling the first successful experiments with holographic Mission Task Elements. Beyond the helicopter, the HoloLens was tested in a car and on a high-speed boat, where holograms remained spatially stable despite high-frequency movements, with a maximum low-frequency error of 0.6° in heading. Static errors depended solely on the external tracker's quality. These results demonstrate the HoloLens 2's potential for operational use in dynamic vehicle environments, enhancing immersion. Its mixed-reality features and adaptability proved particularly valuable for rapid research and development across platforms.
Mercury Systems, Inc. Andover, MA 978-256-1300
Autorotation maneuvers in helicopters are generally performed in an emergency following some form of catastrophic mechanical or system failure. It is a complex maneuver to perform because the pilot is required to perform several tasks simultaneously and the timing of each of them needs to be precise. Workload can be high and the consequences of getting things wrong can be fatal. Following on from a series of studies that investigated the use of symbology presented on a Head-Up Display to try to assist a helicopter pilot to fly the autorotation maneuver more safely and accurately, this paper presents a pilot-in-the-loop flight simulation study to explore the use of haptic cueing to help the pilot maintain indicated air- and main rotor speeds. Various entry conditions to autorotation maneuver are assess via simulated flight trial at Liverpool's HELIFLIGHT-R full motion flight simulator. Subjective evaluation of the results show that the haptic cues are useful to pilots in terms of reducing the workload to perform a successful autorotation landing.
At CES 2022 Panasonic Automotive Systems Company of America unveiled AR HUD 2.0 (Augmented Reality Head-Up Display 2.0), the first system to include a new, patented eye-tracking system (ETS). If you've ever thought about what exists beyond the limits of a HUD and the small rectangular box it displays on the windshield, welcome to the world of AR. And note that AR is not VR, Virtual Reality; VR is a space in which headsets or special glasses allow the wearer to experience a 3D world that doesn't exist except in this technology. It's increasingly used in automotive interior design.
Researchers have developed a LiDAR-based augmented reality head-up display for use in vehicles. Tests on a prototype version of the technology suggest that it could improve road safety by “seeing through” objects to alert of potential hazards without distracting the driver.
ABSTRACT
Integration of a driver monitor system (DMS) in a head-up display (HUD) gives the monitor camera a continuous view of the driver’s face, since the driver always faces the road ahead. However, with both infrared (IR) illuminator and IR camera packaged in the HUD, reflectivity of the windshield is important at IR wavelengths used by the camera. Not only is windshield IR reflectivity important for a clear camera image of the driver’s face, but increasing windshield reflectivity also decreases the effect of ambient sunlight on the camera image of the driver’s face. We describe a method to measure windshield reflectivity, both for the 940 nm band used by a DMS, and for visible light for the HUD. The measurement method uses a fiber-optic spectrometer, two collimating lenses, and a method to compensate for sample tilt. The lenses are mounted on a stage that adjusts the height above the sample. As an example, this method was used to characterize an IR reflecting windshield, prepared for a prototype automotive HUD. At 940 nm, and 45° angle of incidence, the measured reflectivity is > 85% for unpolarized incident light. For visible light at 550 nm, and 62° angle of incidence, the measured reflectivity is 13.9% for both an IR reflecting windshield and for a reference windshield, for unpolarized incident light. The prototype windshield gives a good reflected image for the DMS IR camera and a good HUD image as seen by the driver. The method used to prepare this prototype windshield is suitable for high-volume production.
This document recommends criteria and requirements for a flight management system (FMS) for transport aircraft. The FMS shall provide the functions of lateral navigation, vertical navigation, and performance management and may include time of arrival control. The FMS design shall take human factors considerations into account to produce a fault tolerant system.
This paper presents preliminary results of a pilot-in-the-loop (PIL) study of different cueing designs to reduce pilot workload in rotorcraft shipboard landings. The participants were tasked with flying an approach to touchdown on the deck of an Arleigh Burke Flight IIA class Destroyer under both day visual flight rules (VFR) and night-unaided, zeroillumination conditions. For each condition, the participants were presented with three different cue types. For the day iterations these were a generic military standard heads up display (HUD), a ship fixed tunnel in the sky (tunnel), and a virtual flight lead cueing system (FLCS). The zero-illumination night condition was deemed impossible to land with only the HUD, so it was replaced with a combination of the tunnel and FLCS for the purpose of gaining initial feedback on combining elements of different systems. Terminal landing constraints (location, heading, and impact velocity) were used as measures of pilot performance, the NASA Task Load Index (TLX) survey was used to evaluate perceived pilot workload, and the System Usability Scale (SUS) was used to rate interface and cueing usability. Initial findings showed that pilots viewed the tunnel cueing as having the lowest perceived workload while the FLCS provided the best terminal performance. All types of 3D cueing improved performance when compared to the HUD baseline. The use of 3D cueing also expanded the operational envelope to include zero-illumination conditions. For completeness, the study requires additional subjects, specifically those that have prior shipboard landing experience, as COVID-19 safety precautions paused in-person simulator testing early in the testing period. This body of work represents the next iteration of FLCS research, initially published in Ref. 1.
The head-up display system can overlay the real object with the projected image to assist the driver in driving. However, when road conditions are bad, the continuous vibration of the vehicle will cause the vehicle to tilt and shift. At this time, the projected image and the real object do not overlap well. This paper presents a correction algorithm for a head-up display system. The algorithm corrects the position of the projected image by inputting the tilt state of the vehicle. In this paper, the coordinate axis with the driver's eye as the origin is first established. Then the tilt state of the vehicle is decomposed into the rotation angle in three directions and the displacement in the vertical direction. Finally, the position of the projected image is corrected by inputting the tilt state of the vehicle so that the projected image can remain on the real object at all times. The simulation model is established in Unity3D. The effectiveness of the correction algorithm is verified by inputting the tilt state of the vehicle. The results show that the projected image can be correctly displayed on the real object under different tilt situations when the initial position of the real object is constant. When the initial position of the real object changes, the projection can also be correctly displayed on the real object in the same tilt state.
This document presents criteria for flight deck controls and displays for Airborne Collision Avoidance Systems.
The adoption of head-up displays (HUDs) is increasing in modern automobiles. Yet integrating this technology into vehicles with standard windshield (WS) laminates can create negative effects for drivers, primarily due to the thickness of glass used. The double ghosting in HUD images is typically overcome by employing a wedged PVB between the two glass plies of the laminate. Another solution is to reduce the thickness of the glass without impacting the overall windshield toughness. Although this still requires the use of a wedged PVB to eliminate HUD ghosting, the thinner glass provides opportunity to increase the image size. However, reducing the thickness of a soda-lime glass (SLG) ply or plies in a conventional soda-lime glass (SLG) laminate can significantly impact the robustness of the laminate to external impact events. This paper will review how a hybrid laminate made from one ply of a relatively thick SLG and a second ply of relatively thin, chemically-strengthened glass, will not only improve the windshield robustness but simultaneously provide better optical performance for HUD applications. Exemplary thin, chemically-strengthened glass can be fusion-formed and demonstrates superior optical and surface qualities compared to float-formed SLG, and typically exhibits greater damage resistance than SLG. When used in a windshield, these lightweight hybrid laminates offer enhanced HUD performance and require a smaller wedge angle. The thickness and wedge angle reduction reviewed in this paper have a significant impact on the ghosting of objects observed in transmission through the windshield. While thick laminates with panoramic shapes suffer from degraded night vision, the use of hybrid laminates significantly reduces the ghosting in transmission. Hybrid laminates can help OEMs move towards more elaborate windshield shapes and assist in improving the vehicle’s aesthetics and aerodynamics.
Head-up displays (HUDs) give visual information to drivers in an easy to understand manner and prevent traffic accidents. Augmented reality head-up displays (AR-HUDs) display the driving information overlaid on the actual scenery. The AR-HUD must allow the visual information and the actual scene to be viewed at the same time, and a sense of depth and distance are key factors in achieving this. Binocular parallax used in stereoscopic 3D display is one of the most useful methods of providing a sense of depth and distance. Generally, stereoscopic 3D displays must limit the image range to within Panum’s fusional area to ensure fusion of the stereoscopic images. However, when using a stereoscopic 3D display for an AR-HUD, the image range must extend beyond Panum’s fusional area to allow the visual information and the actual scene to be displayed at the same time. In this study, we investigate the visibility of images displayed beyond Panum’s fusional area on a stereoscopic 3D display for an AR-HUD. Ease of fusion was measured by the recognition time for participants watching remote projector images and parallax images displayed at the same time beyond Panum’s fusional area. We found that one group of participants was unable to recognize the relationship between the two images under certain conditions.
It's become a rarity for automakers to place manual-transmission models in their press-evaluation fleets, but the Elantra Sport's direct (if light) lever action and skillfully-weighted clutch pedal made it all the more pleasing to manual-shift for a week. Although the Sport has a unique, assertively-styled grille and other panels that differentiate it from the rest of the Elantra lineup, it's not just an appearance job-there's something going here: don't forget, Hyundai hired BMW's former M-division engineering boss a couple years ago. There's a useful 201 hp from the turbocharged, direct-injected 1.6-L 4-cylinder and scant lag. With the 6-speed manual, the Sport's just on the civil side of fast-and is a treat to hustle around in the middle gears.
Continental is developing its innovative 3D instrument display cluster with the aim of bringing it to production within the next 24-36 months. The display, previewed by Automotive Engineering at a recent technology meeting, features a high-definition (1920 × 720 pixel) 12.3-in screen but is suitable for displays measuring 15 in. “The proliferation of displays in the interior of the cabin allows for more individuality, variety of shapes and appearances” a Continental engineer explained, adding, “Instead of relying on flat, one-dimensional surfaces, we are offering a solution that allows designers to play with the interior in a creative and cost-efficient way.”
A new concept of Head Up Display is presented, using the windshield as a transparent screen. This breakthrough technology does not need the use of complex combiner, bulky optics and overhead projection unit. The novel system uses several holographic optical elements to perform a 3D stereoscopic display, with the ability to present floating graphical objects in a large field of view. Augmented Reality display will be possible, increasing considerably the User Experience and situational awareness, without the need of wearing a bulky and complex Head Mounted Display.
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