35.1: Moving Picture Quality Improvement for Hold‐type AM‐LCDs

Kurita, Taiichiro

doi:10.1889/1.1832037

Cited by 160 publications

(141 citation statements)

References 3 publications

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“…When a human eye sees moving images, the sight line is presumed to perfectly track the moving image to locate the images on the center of the retina. Moreover, it is also assumed that optical stimulations within 1/60 s are perceived in an average value only after being perfectly integrated in the visual system [1,2,13]. Then, the DFC noise can be explained by the model shown in Fig.…”

Section: Dynamic False Contour Noise Recognition Modelmentioning

confidence: 99%

“…Liquid crystal displays (LCDs) are analog displays that present grayscale images by controlling the amount of light passing through a liquid crystal. In the case of LCDs, motion blurs are produced, i.e., the outline of a moving image becomes blurred [1,2]. On the other hand, it is called as digital mode displays that the displays represent grayscales on the basis of the length of time required to hold light emissions in a 1TV field, such as plasma display panels (PDPs).…”

Section: Introductionmentioning

confidence: 99%

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Pseudo 480-Hz Driving Method for Digital Mode Grayscale Displays

Ryeom¹

2013

Journal of Electrical Engineering and Technology

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-A pseudo 480-Hz drive method has been proposed to reduce the dynamic false contour noise that occurs on flat panel displays with displaying grayscale image in the digital mode, such as plasma display panels. The proposed method makes the image movements nearly continuous by rearranging the 8-bit image data displayed for 1 TV field into 8 subfields. The position of the image data rearranged in subfields has been optimized on the basis of the speed of the moving image by computer simulations for the dynamic false contour noise. It is verified that a significant reduction in the dynamic false contour noise is achieved with the proposed method as compared to the conventional noise reduction technologies. Moreover, to reduce the noise in digital mode displays, the proposed technology requires only 8 subfields. Therefore, there is no reduction in the brightness of the image.

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Section: Dynamic False Contour Noise Recognition Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pseudo 480-Hz Driving Method for Digital Mode Grayscale Displays

Ryeom¹

2013

Journal of Electrical Engineering and Technology

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“…An improvement of the moving image quality of LCD is considered as a concrete example. In addition to the problem of a liquid crystal's own response, LCD had the problem that the moving image quality decreased due to the hold-type display of LCD [31] . The former problem was resolved by improving the liquid crystal cell and driving method, and the latter was improved by blinking backlight technology, which switched the backlight off after a definite period of time in one frame [32] .…”

Section: Influence Of Product Architecture On Lcd and Pdp Market Compmentioning

confidence: 99%

Influence of Product Architecture on the Competition Between LCD and PDP Technologies

Sato¹,

Fujimura²

2012

RISUS

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Abstract:The popularity of flat TVs began to reach its stride at the beginning of the 21st century, and the market size has expanded rapidly. The plasma display panel (PDP) technology was predominant initially, but the liquid crystal display (LCD) technology has presently overtaken PDP technology. Most of the actual conditions for the competition between LCD and PDP have not been clarified. In this study, our aim was to understand the factors because of which LCD overtook PDP in terms of the product architecture and to clarify the architecture's influence on the competition between LCD and PDP. The results showed that PDP and LCD have integral-type and modular-type architectures, respectively, and that this difference has had a big influence on the market competition between the two technologies. Key Words: Product architecture; LCD; PDP. IntroductionThe popularity of flat TVs began to reach its stride at the beginning of the 21st century, and the market size expanded rapidly to replace cathode ray tube (CRT) technology and fill the newly expanding market for large-sized TVs of 40 inches or more. Among the flat TV technologies, the plasma display panel (PDP) technology was predominant initially, but liquid crystal display (LCD) technology has presently overtaken PDP technology. However, most of the actual conditions of the competition between LCD and PDP have not been clarified. Although many studies have been carried out on the LCD industry, most were related to its development or the competition between Japanese, South Korean and Taiwanese firms [1][2][3][4][5] ; there has been no research aimed at clarifying the factors because of which LCD has overtaken PDP. The principles and structures of LCD and PDP are completely different, so a difference in product architectures seems to exist. We examined the influence of the product architecture on the competition between LCD and PDP and aimed to understand the factors because of which LCD has overtaken PDP in terms of the product architecture. Our findings show that there was a difference in product architecture between LCD and PDP that had a big influence on the market competition between LCD and PDP. This case study is a very

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“…However, the human eye moves continuously and linearly. Th e diff erence between the trajectory of the eye and the movement path of the image on the display causes the viewer to perceive the moving image as being blurred ( Figure 5(a)), no matter how fast the response time of the liquid crystal [52][53][54][55][56].…”

Section: Holding-type Display Problemmentioning

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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35.1: Moving Picture Quality Improvement for Hold‐type AM‐LCDs

Abstract: Deterioration of moving picture quality due to hold-type displays is investigated with simulations using a special CRT. Two methods to improve moving picture quality are proposed and evaluated.

Cited by 160 publications

References 3 publications

Pseudo 480-Hz Driving Method for Digital Mode Grayscale Displays

Pseudo 480-Hz Driving Method for Digital Mode Grayscale Displays

Influence of Product Architecture on the Competition Between LCD and PDP Technologies

Technical evolution of liquid crystal displays

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