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Expanding the VR immersion comfort zone

Near-eye displays are emerging as the future of portable devices, providing individuals with immersive virtual reality experiences. The primary objectives…

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Near-eye displays are emerging as the future of portable devices, providing individuals with immersive virtual reality experiences. The primary objectives in developing these displays are to create immersive experiences and ensure visual comfort. While a larger field of view (FOV) enhances immersion in virtual reality, addressing the Vergence-Accommodation-Conflict (VAC) is crucial for comfortable vision. Researchers have explored innovative approaches to tackle these challenges. A significant breakthrough in near-eye displays is the integration of light field technology. However, earlier light field displays in VR were limited by their small size and low resolution, resulting in constrained viewing angles and screen window effects. The authors of a paper published recently in the Journal of Optical Microsystems successfully overcame these limitations by utilizing a 3.1-inch 3k3k LC display. Nevertheless, the transition to high-resolution VR LCD displays presented material and process challenges that demanded attention.

Credit: The Authors doi 10.1117/1.JOM.3.4.041202.

Near-eye displays are emerging as the future of portable devices, providing individuals with immersive virtual reality experiences. The primary objectives in developing these displays are to create immersive experiences and ensure visual comfort. While a larger field of view (FOV) enhances immersion in virtual reality, addressing the Vergence-Accommodation-Conflict (VAC) is crucial for comfortable vision. Researchers have explored innovative approaches to tackle these challenges. A significant breakthrough in near-eye displays is the integration of light field technology. However, earlier light field displays in VR were limited by their small size and low resolution, resulting in constrained viewing angles and screen window effects. The authors of a paper published recently in the Journal of Optical Microsystems successfully overcame these limitations by utilizing a 3.1-inch 3k3k LC display. Nevertheless, the transition to high-resolution VR LCD displays presented material and process challenges that demanded attention.

The research highlights the importance of employing high-resolution liquid crystal displays (LCDs) to address light field resolution issues. The authors elaborate on strategies to enhance LCD resolution, including aperture and contrast ratios through specialized pixel designs and driving techniques. Additionally, the paper explores novel applications of light field technology beyond its use in VR displays, namely, in vision correction for VR systems.

“By utilizing light field technology, both vision correction and the expansion of the eyebox are achieved, thereby elevating the overall virtual reality experience and enhancing user comfort,” said Yung-Hsun Wu, one of the researchers from Innolux Corporation in Taiwan.

The paper investigates the optics of light field virtual reality, demonstrating the creation of elemental image (EI) arrays through a lens array and spatially multiplexed light field optics. This approach generates volumetric virtual images that accurately simulate proper eye accommodation, eliminating the need to address VAC.

The authors focus on a recently developed INNOLUX LCD with impressive resolution and pixel density. By introducing a 15-degree tilt between panels, the binocular FOV is expanded, ensuring exceptional angular resolution. The Modulation Transfer Function (MTF) across the image field guarantees the faithful reproduction of high-quality images.

Furthermore, the paper addresses visual correction within the realm of light field VR. It introduces a ray tracing-based graphical process called “corrected eye box mapping,” facilitating the correction of myopia, hyperopia, and astigmatism. This procedure takes into account parameters like spherical power (SPH), cylinder power (CYL), and cylinder axis (AXIS) for comprehensive visual correction.

In conclusion, the paper offers a comprehensive exploration of the development of high-resolution light field displays, encompassing advancements in display design, pixel architecture, and vision correction through the integration of light field technology. This research significantly contributes to the progression of light field displays, paving the way for enriched visual experiences within high-resolution VR systems.

Read the Gold Open Access paper by Wu et al., “Enhancing virtual reality with high-resolution light field liquid crystal display technology,” J. Opt. Microsys. 3(4) 041202 (2023) doi: 10.1117/1.JOM.3.4.041202. 


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Vitalik Buterin voices concerns over DAOs approving ETH staking pool operators

The Ethereum co-founder proposes a solution that could lower the likelihood of any individual liquid staking provider growing to a point where it poses…

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The Ethereum co-founder proposes a solution that could lower the likelihood of any individual liquid staking provider growing to a point where it poses a systemic risk.

Vitalik Buterin, the co-founder of Ethereum, has expressed worries regarding decentralized autonomous organizations (DAOs) exerting a monopoly over the selection of node operators in liquidity staking pools.

In a September 30 blog post, Buterin issues a warning that as staking pools adopt the DAO approach for governance over node operators—who are ultimately responsible for the pool's funds—it can expose them to potential risks from malicious actors.

“With the DAO approach, if a single such staking token dominates, that leads to a single, potentially attackable governance gadget controlling a very large portion of all Ethereum validators.”

Buterin highlights the liquid staking provider Lido (LDO) as an example with a DAO that validates node operators. However, he emphasizes that relying on just one layer of protection may prove insufficient:

“To the credit of protocols like Lido, they have implemented safeguards against this, but one layer of defense may not be enough,” he noted.

ETH staked by category chart. Source: Vitalik Buterin

Meanwhile, he explains that Rocket Pool offers the opportunity for anyone to become a node operator by placing an 8 Ether (ETH) deposit, which, at the time of this publication, is equivalent to approximately $13,406.

However, he notes this comes with its risks. "The Rocket Pool approach allows attackers to 51% attack the network, and force users to pay most of the costs," he stated.

On the other hand, Buterin highlights that having a mechanism to ascertain who can act as the underlying node operators is an inevitable necessity:

"It can't be unrestricted, because then attackers would join and amplify their attacks with users' funds."

Related: Ethereum is about to get crushed by liquid staking tokens

Buterin further outlines that a possible approach to address this issue involves encouraging ecosystem participants to utilize a variety of liquid staking providers. 

He clarifies this would decrease the likelihood of any one provider becoming excessively large and posing a systemic risk.

“In the longer term, however, this is an unstable equilibrium, and there is peril in relying too much on moralistic pressure to solve problems," he stated.

Magazine: Are DAOs overhyped and unworkable? Lessons from the front lines

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DOJ readies witnesses in Bankman-Fried trial, spotlight on FTX assets

This initiative also encompasses their comprehension of Sam Bankman-Fried’s remarks and conduct, particularly regarding FTX’s asset management.

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This initiative also encompasses their comprehension of Sam Bankman-Fried's remarks and conduct, particularly regarding FTX's asset management.

The Department of Justice (DOJ) has affirmed its plan to summon former FTX clients, investors, and staff as witnesses in the upcoming trial involving Sam Bankman-Fried, the former FTX executive. This will shed light on how these individuals viewed their interactions with Bankman-Fried and his company. 

The DOJ submitted a letter motion in limine on Sept. 30, to enable them to get the interpretation of the witnesses on FTX’s treatment of customer assets, which will hold significant importance.

Importantly, these testimonies are intended to provide valuable perspectives on the interactions between the accused and these witnesses. This initiative also encompasses their comprehension of Bankman-Fried's remarks and conduct, particularly regarding FTX's asset management. The DOJ intends to emphasize the experiences of both retail and institutional clients who entrusted substantial assets to FTX with the belief that the platform would safeguard them securely.

Court filing in the U.S. District Court for the Southern District of New York. Source: CourtListener

Furthermore, a distinctive situation has emerged concerning one of the DOJ's witnesses, referred to as "FTX Customer-1," who resides in Ukraine. Given the ongoing conflict, there are difficulties associated with traveling to the United States to provide testimony. Consequently, the DOJ has suggested using video conferencing as a viable alternative. However, Bankman-Fried's defense has not yet approved this proposal.

Nonetheless, the legal team representing Bankman-Fried, led by lawyer Mark Cohen, has voiced concerns about the jury questions put forth by the DOJ. According to Bankman-Fried’s defense, these interrogations insinuate guilt on Bankman-Fried's part, potentially undermining the principle of "innocent until proven guilty."

Additionally, the defense contends that these inquiries may not effectively uncover the jurors' inherent biases, especially if related to their personal encounters with cryptocurrencies. Moreover, certain questions could inadvertently guide the jury's perspective instead of eliciting authentic insights, possibly compromising the trial's impartiality.

Related: Sam Bankman-Fried’s lawyer challenges US gov’t proposed jury questions

With the jury selection scheduled to start on Oct. 3, closely followed by the trial, the spotlight is firmly on this high-stakes legal confrontation. This case underscores not only its immediate consequences but also underscores the vital importance of transparent communication and unbiased questioning in upholding the principles of justice.

Magazine: Deposit risk: What do crypto exchanges really do with your money?

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Vitalik Buterin voices concerns over DAOs approving stake pool operators

The Ethereum co-founder proposes a solution that could lower the likelihood of any individual liquid staking provider growing to a point where it poses…

Published

on

The Ethereum co-founder proposes a solution that could lower the likelihood of any individual liquid staking provider growing to a point where it poses a systemic risk.

Vitalik Buterin, co-founder of Ethereum, has expressed worries regarding decentralized autonomous organizations (DAOs) exerting a monopoly over the selection of node operators in liquidity staking pools.

In a September 30 blog post, Buterin issues a warning that as staking pools adopt the DAO approach for governance over node operators—who are ultimately responsible for the pool's funds—it can expose them to potential risks from malicious actors.

“With the DAO approach, if a single such staking token dominates, that leads to a single, potentially attackable governance gadget controlling a very large portion of all Ethereum validators.”

Buterin highlights staking protocol Lido (LDO) as an example with a DAO that whitelists node operators. However, he emphasizes that relying on just one layer of protection may prove insufficient.

“To the credit of protocols like Lido, they have implemented safeguards against this, but one layer of defense may not be enough,” he noted.

ETH staked by category chart. Source: Vitalik Buterin

Meanwhile, he explains that Rocket Pool offers the opportunity for anyone to become a node operator by placing an 8 Ether (ETH) deposit, which, at the time of this publication, is equivalent to approximately $13,406.

However, he notes this comes with its own risks. "The Rocket Pool approach allows attackers to 51% attack the network, and force users to pay most of the costs," he stated.

Related: Ethereum is about to get crushed by liquid staking tokens

Buterin highlights that a possible approach to address this issue involves encouraging ecosystem participants to utilize a variety of liquid staking providers. 

He clarifies this would decrease the likelihood of any one provider becoming excessively large and posing a systemic risk.

“In the longer term, however, this is an unstable equilibrium, and there is peril in relying too much on moralistic pressure to solve problems.”

Magazine: Are DAOs overhyped and unworkable? Lessons from the front lines

Read More

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