13.2: Viewing Angle Comparison of IPS and VA Medical AMLCDs

Badano, Aldo

doi:10.1889/1.2036398

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…7, the polarization T in is transformed to P1 by the first retardation film which has an N z value smaller than 0.5. N z is the birefringent index expressed by the following equation: (1) where n x , n y , and n z are the refractive indexes, and the subscripts x, y, and z express each principal axis (x and y are in the plane).…”

Section: New Optical-compensation Methodsmentioning

confidence: 99%

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An IPS‐LCD with a high contrast ratio of over 80:1 at all viewing angles

et al. 2007

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Abstract— A 32‐in. IPS‐LCD with a significantly wide‐viewing‐angle performance has been developed using a new optical compensation method. It provides a contrast ratio of over 80:1 at all viewing angles, which enhances its color saturation at oblique angles. According to our study, it is important to shorten the path of the optical compensation in the Poincaré sphere. We have found an effective method using two retardation films, one with an Nz value larger than 0.5 and one with a value smaller than 0.5.

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Section: New Optical-compensation Methodsmentioning

confidence: 99%

“…However, it has been pointed out that further improvement is needed for dark image quality at oblique angles. 1 The issues are the light leakage and the color shift in the black state. To solve these issues, several good optical compensation methods have been proposed.…”

Section: Introductionmentioning

confidence: 99%

An IPS‐LCD with a high contrast ratio of over 80:1 at all viewing angles

et al. 2007

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“…Often the operators view the screen from different positions as they move around the surgery or examination room. Therefore, it is important to choose screens with In-Plane-Switching (IPS) technology that maintains a good ratio of luminance and contrast at high viewing angles [143].…”

Section: User Interfacementioning

confidence: 99%

Embedded Sensor Systems in Medical Devices: Requisites and Challenges Ahead

Arandia

Gárate

Mabe

2022

Sensors

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The evolution of technology enables the design of smarter medical devices. Embedded Sensor Systems play an important role, both in monitoring and diagnostic devices for healthcare. The design and development of Embedded Sensor Systems for medical devices are subjected to standards and regulations that will depend on the intended use of the device as well as the used technology. This article summarizes the challenges to be faced when designing Embedded Sensor Systems for the medical sector. With this aim, it presents the innovation context of the sector, the stages of new medical device development, the technological components that make up an Embedded Sensor System and the regulatory framework that applies to it. Finally, this article highlights the need to define new medical product design and development methodologies that help companies to successfully introduce new technologies in medical devices.

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“…Therefore, the transmittance in typical IPS mode with a 4:6 structure (the ratio of electrode width to electrode gap) is about 60-65% of the transmittance in TN mode. It is also difficult to optimize the fully dark state because of the deviation of the easy axis of the LCs from the rubbing direction, and because of a misalignment between the easy axes of the top and bottom substrates [17,18]. To solve these problems, Oka et al presented a normally white IPS mode with a 90˚ TN, called an in-plane switching twisted nematic mode (IT mode) [19].…”

Section: Introductionmentioning

confidence: 99%

Electro-optical characteristics of a chiral hybrid in-plane switching liquid crystal mode for high brightness

Gwag¹,

Sohn²,

Kim³

et al. 2008

Opt. Express

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We propose a new in-plane switching (IPS) nematic liquid crystal (LC) mode which uses a twist effect with a hybrid LC alignment and interdigitated electrodes as an approach for a high brightness. This is optimized to a normally white mode to minimize loss of transmittance at the electrode compared to the conventional IPS mode. The proposed mode shows an excellent dark state because the bulk LCs are aligned in parallel to the optic axis of the polarizer under low electric fields. Consequently, this proposed mode exhibits a much higher contrast ratio (980:1) than that of the conventional IPS mode (550:1).

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13.2: Viewing Angle Comparison of IPS and VA Medical AMLCDs

Cited by 10 publications

References 8 publications

An IPS‐LCD with a high contrast ratio of over 80:1 at all viewing angles

An IPS‐LCD with a high contrast ratio of over 80:1 at all viewing angles

Embedded Sensor Systems in Medical Devices: Requisites and Challenges Ahead

Electro-optical characteristics of a chiral hybrid in-plane switching liquid crystal mode for high brightness

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