Viewing angle performance of TN-LCD with hybrid aligned nematic film

Toyooka, T.; Yoda, Eiji; Yamanashi, T.; Kobori, Yoshihiro

doi:10.1016/s0141-9382(99)00026-8

Cited by 16 publications

(16 citation statements)

References 5 publications

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“…They are suitable for many low-cost panels from small size displays (in several inches) for cell phones and cameras to large size displays (up to 26 inch) for monitors and televisions [61][62][63]. Nowadays the CR and viewing angle of TN mode TFT-LCD with compensation film have already exceeded 1000:1 Fig.…”

Section: Polarizer Filmmentioning

confidence: 99%

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Jin

2011

Displays

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Section: Polarizer Filmmentioning

confidence: 99%

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Jin

2011

Displays

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“…Active studies have been driven by the color shift property [21], [22] to display different contents to the users at different viewing angles. Harrison et.…”

Section: Related Workmentioning

confidence: 99%

Secret key distribution leveraging color shift over visible light channel

Liu

Shi

et al. 2017

2017 IEEE Conference on Communications and Network Security (CNS)

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Given the widely adoption of screen and camera in many electronic devices, the visible light communication (VLC) over screen-to-camera channel emerges as a novel short range communication technique in recent years. Active research explores various ways to convey messages over screen-camera channel, such as barcode and unobtrusive optical pattern. However, with the prevalence of LED screens of wide viewing angles and mobile devices equipped with high standard cameras, the threat of information leakage over screen-to-camera channel becomes in-negligible. Few studies have discussed how to ensure the security of data transmission over screen-to-camera channel. In this paper, we propose a secret key distribution system leveraging the unique color shift property over visible light channel. To facilitate such design, we develop a practical secret key matching based method to map the secret key into gridded optical patterns on screen, which can only be correctly recognized by the legitimate user through an accessible region and allow regular data stream transmission through valid grids. The proposed system is prototyped with off-the-shelf devices and validated under various experimental scenarios. The results show that our system can achieve high bit-decoding accuracy for the legitimate users while maintaining comparable data throughput as regular unobtrusive VLC systems with very low recovery accuracy of the encrypted data for the attackers.

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“…We can see that the R, G, and B channel curves all follow the same trends, with slight differences in the exact numbers. Although we measured numbers in these graphs from a single LCD, theoretical analysis on LCD performance [8,14,16] suggests that the general trends of these curves generalize to all TN LCDs, even though the exact numbers may vary between devices. As we can see, the vertical viewing angles show much more dramatic changes in light intensity than the horizontal viewing angles do.…”

Section: Tn-based Liquid Crystal Display (Lcd)mentioning

confidence: 99%

“…We now explain how we gain such specific knowledge. While previous research has shown it is in theory possible to calculate such curves through simulation [14], this requires tens of intrinsic parameters of the LCD that are generally inaccessible without elaborate calibration and calculation [8,16]. We developed practical methods to empirically measure these curves.…”

Section: Measuring Brightness Curvesmentioning

confidence: 99%

Enabling concurrent dual views on common LCD screens

Kim

Cao

Zhang

et al. 2012

Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

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Researchers have explored a variety of technologies that enable a single display to simultaneously present different content when viewed from different angles or by different people. These displays provide new functionalities such as personalized views for multiple users, privacy protection, and stereoscopic 3D displays. However, current multi-view displays rely on special hardware, thus significantly limiting their availability to consumers and adoption in everyday scenarios. In this paper, we present a pure software solution (i.e. with no hardware modification) that allows us to present two independent views concurrently on the most widely used and affordable type of LCD screen, namely Twisted Nematic (TN). We achieve this by exploiting a technical limitation of the technology which causes these LCDs to show varying brightness and color depending on the viewing angle. We describe our technical solution as well as demonstrate example applications in everyday scenarios.

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Viewing angle performance of TN-LCD with hybrid aligned nematic film

Cited by 16 publications

References 5 publications

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Secret key distribution leveraging color shift over visible light channel

Enabling concurrent dual views on common LCD screens

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