48.2: DCCII: Novel Method for Fast Response Time in PVA Mode

Song, Jang‐Kun; Lee, Kyung‐Eun; Chang, H. S.; Hong, Sang‐Mi; Jun, Man‐Bok; Park, Bo‐Yoon; Seomun, San‐Seong; Kim, Kyeong‐Hyeon; Kim, Sang‐Soo

doi:10.1889/1.1825761

Cited by 57 publications

(28 citation statements)

References 1 publication

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“…One method for suppressing the formation of texture is the application of a pre-tilt voltage prior to application of the conventional overshoot voltage [47]. The pre-tilt signal helps the LC molecules tilt over to the desired direction without forming a Schlieren texture, and improves the response time signifi cantly.…”

Section: Response Timementioning

confidence: 99%

Technical evolution of liquid crystal displays

2009

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I n 1888, more than a century ago, the Austrian botanist FriedrichReinitzer discovered an intermediate state of matter between isotropic liquid and lattice-structured crystal [1][2][3]. Th is state, later termed liquid crystal (LC), remained merely a novelty for many years until suitable applications for the technology began to become apparent. From the late 1960s, following the realization that various display applications were possible, the popularity of liquid crystal as a research fi eld expanded rapidly, attracting the interest of many scientists who made fundamental contributions to the technologies that have led to the spectacular success of liquid crystal displays (LCDs) [3][4][5][6][7][8][9][10][11][12][13]. Th e development of the twisted nematic (TN) [4] and supertwisted nematic (STN) [5] cell confi gurations, along with the necessary manufacturing technologies [6][7][8][9], resulted in the birth of the LCD industry in the late 1970s and early 1980s. The subsequent development of thin-film transistor (TFT) technology provided a further boost to the industry in the late 1980s [14,15]. Th e boom was signifi cantly supported by the advancement of material technologies such as the highly reliable manufacturing of liquid crystal base materials, and the development of polymers for the alignment layer, color fi lter materials, and sheet-type polarizers formed from the poly(vinyl alcohol)-iodine complex.In the 1990s, LCDs occupied an important position in the display market primarily through notebook applications, although the cathode ray tube (CRT) continued to dominate the desktop monitor and television markets. Th e plasma display panel (PDP), which appeared in the commercial market in 1997, pioneered the large-area fl at panel display market. It was widely predicted at the time that PDPs would maintain the lead in the large-area display market and that LCDs in small-display information technology (IT) applications would soon be replaced by new technologies such as displays based on organic light-emitting diodes (OLEDs) [16,17]. Such predictions were based on the belief that the LCD technology suff ered from serious limitations in terms of both off -axis image quality and moving picture quality, and also that it had proved diffi cult to obtain reasonable manufacturing yields of large-area TFT panels. However, these predictions, as we now know, turned out to be incorrect. Th e application of LCDs has expanded rapidly in recent years from purely information technology (IT) applications to the television and mobile display markets, and now even to very-large-area digital information displays (DIDs).Interestingly, while LCDs penetrated the traditional territories of other display technologies including CRTs and PDPs, attracting inevitable and heavy competition from these technologies, the most critical competitors were in fact alternative LCD technologies. A range of LCD modes and technologies are now applied in the same areas of application and are compared directly with one another in the market. In applicat...

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Section: Response Timementioning

confidence: 99%

Technical evolution of liquid crystal displays

2009

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“…This special mechanism slows down the transition from the black state, and if some level of voltage is applied prior to the transition from the black state, then most of molecules will transition at the same time so that the next transition can be quickly initiated. 6 Figure 6(c) shows the respective waveforms for each case, and that a combined application of pre-tilt and overshoot provides the best transition performance. This means that the residual black luminance caused by an incomplete transition makes all successive rising transitions different, depending upon the previous gray levels.…”

Section: Black-frame-insertion Drivingmentioning

confidence: 99%

Analysis of response‐time compensation for black‐frame insertion

Kim¹,

Park²,

Shin³

et al. 2007

J Soc Info Display

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Abstract— An impulsive driving technique has been widely adopted for the elimination of motion blur in LCDs. Although the problem of slow temporal response time is very well known for LCDs, the inherent motion blur of moving objects in hold‐type displays has a more‐serious impact on display performance. It is well known that even very fast LCDs with zero response time still suffer from the motion‐blur artifact due to hold‐type driving effects. However, a fast temporal response is also critical in order to maximize the blur‐reduction effect even in the case of impulsive driving. In this paper, the special behavior of LC molecules in an impulsive driving environment has been analyzed especially for the case of black‐frame insertion, and we propose an effective means to implement optimized response‐time compensation (RTC) for the black‐frame insertion technique.

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“…Among the various LCD modes, the VA mode exhibits a superior dark state because the LC molecules are aligned perpendicular to the substrate in the initial dark state, resulting in a high contrast ratio [9,10]. However, the response time of the VA mode is not sufficiently fast to realize high-quality video [11,12]. To reduce the response time several methods have been proposed [13][14][15][16][17][18][19][20][21][22][23][24], but they have drawbacks, such as a complicated driving scheme, complex fabrication process, and increase in the operating voltage.…”

Section: Introductionmentioning

confidence: 99%

Fast Switching of Vertically Aligned Liquid Crystals by Low-Temperature Curing of the Polymer Structure

Park¹,

Oh²,

Kim³

et al. 2014

Journal of the Optical Society of Korea

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We proposed a method for fast turn-off switching of a vertically-aligned liquid crystal cell by low-temperature curing of the polymer structure. We confirmed that the turn-off times of the fabricated cells were reduced significantly as the curing temperature was lowered to -20℃. We accounted for the effect of low-temperature curing on the turn-off time by using a mathematical model and by observing images obtained via scanning electron microscopy. We also confirmed that low-temperature curing is more effective in reducing the response time when the device is operated at a low temperature.

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48.2: DCCII: Novel Method for Fast Response Time in PVA Mode

Cited by 57 publications

References 1 publication

Technical evolution of liquid crystal displays

Technical evolution of liquid crystal displays

Analysis of response‐time compensation for black‐frame insertion

Fast Switching of Vertically Aligned Liquid Crystals by Low-Temperature Curing of the Polymer Structure

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