30.2: Guiding Principles for High Quality Motion Picture in AMLCDs Applicable to TV Monitors

Yamamoto, Taku; Aono, Yasuhisa; Tsumura, Makoto

doi:10.1889/1.1832979

Cited by 40 publications

(37 citation statements)

References 1 publication

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“…As has been pointed out many times (Bitzakidis, 1995;Yamamoto et al, 2000;Fisekovic et al, 2001), the blur that is seen in moving LCD images is not a property of the device but rather a interaction of the temporal characteristics of the LCD and the eye movements used by observers to track moving images. The moving image displayed using an LCD is a series of images each of which is static during each frame period.…”

Section: Discussionmentioning

confidence: 95%

“…Thus, CRT displays are typically used in applications such as flight simulation where motion fidelity is particularly important. The limited temporal response of LCDs is a consequence of primarily two characteristics: (1) slow onset and offset times and (2) the sample-and-hold property related to both the design of the LCD driver circuitry and the LCD itself (Shima et al, 1995;Yamamoto et al, 2000). Several techniques have been suggested for improving the temporal response of LCDs, including modified LCD driving methods (Nakamura et al, 1998;Nakamura and Sekiya, 2001;Nose et al, 2001;McCartney and Balram, 2004), intermittent illumination (Fisekovic et al, 2001;Kurita, 2001;Pan, 2005), video processing (Bitzakidis, 1995;Klompenhouwer and Velthoven, 2004), and doubling the refresh rate (Kurita, 2001;Lee et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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The effect of FLCoS‐display hold time on the perceived blur of moving imagery

Geri¹,

Morgan²

2007

J Soc Info Display

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Abstract— The on‐ and off‐times of LCDs have decreased significantly over the past few years. However, long hold times, while increasing light output, have limited the temporal resolution of these devices. We have varied hold time and used a perceptual technique to assess the resulting change in blur of a moving test target presented on an FLCoS display. The technique requires observers to adjust the gap between two vertical lines that move across the display at various speeds. It was found that for a 13.4‐msec hold time, the threshold gap width, and thus by implication the perceived blur, increased significantly from about 3 to 22 pixels as line speed was increased. For hold times of 8, 6, 4, and 2 msec, threshold gap width remained approximately constant at between about 2 and 5 pixels as line speed was increased. The results of the perceptual test used here suggest that reducing FLCoS hold time to 8 msec significantly improves the quality of moving imagery. Further, decreasing the hold time to 2 msec results in perceptual blur that extends over as little as 6 arc‐minutes.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

The effect of FLCoS‐display hold time on the perceived blur of moving imagery

Geri¹,

Morgan²

2007

J Soc Info Display

View full text Add to dashboard Cite

show abstract

“…Therefore, we refer to the large body of existing literature considering modeling [26] as well as characteristics and assessment [14]–[16], [25], [27], [28] of motion blur.…”

Section: Introductionmentioning

confidence: 99%

Temporal Properties of Liquid Crystal Displays: Implications for Vision Science Experiments

Elze

Tanner

2012

PLoS ONE

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Liquid crystal displays (LCD) are currently replacing the previously dominant cathode ray tubes (CRT) in most vision science applications. While the properties of the CRT technology are widely known among vision scientists, the photometric and temporal properties of LCDs are unfamiliar to many practitioners. We provide the essential theory, present measurements to assess the temporal properties of different LCD panel types, and identify the main determinants of the photometric output. Our measurements demonstrate that the specifications of the manufacturers are insufficient for proper display selection and control for most purposes. Furthermore, we show how several novel display technologies developed to improve fast transitions or the appearance of moving objects may be accompanied by side–effects in some areas of vision research. Finally, we unveil a number of surprising technical deficiencies. The use of LCDs may cause problems in several areas in vision science. Aside from the well–known issue of motion blur, the main problems are the lack of reliable and precise onsets and offsets of displayed stimuli, several undesirable and uncontrolled components of the photometric output, and input lags which make LCDs problematic for real–time applications. As a result, LCDs require extensive individual measurements prior to applications in vision science.

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“…For television (TV) applications, liquid crystal display (LCD) technology can offer high resolution, large screen diagonal, small form factor (thin), and a high image quality, in particular for still images. 1,2 In combination with substantial investments in LCD factories and manufacturing sites, which significantly reduce the production price, this results in a dominant position of LCDs in today's display industry. 2 Despite their dominant position, improving the motion picture quality is still an important research topic for LCD TVs.…”

Section: Introductionmentioning

confidence: 99%

A perceived sharpness metric based on the luminance slope and overshoot of the motion‐induced edge‐blur profile

Cui

Wei

2012

J Soc Info Display

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To reduce perceived motion blur on liquid crystal displays, typically various techniques such as overdrive, scanning backlight, black‐data insertion, black‐field insertion, and frame rate up‐conversion are widely employed by the liquid crystal display industry. These techniques aim to steepen the edge transitions by improving the dynamic behavior of the light modulation. However, depending on the implementation, this may result in the perception of irregularly shaped motion‐induced edge‐blur profiles. It is not yet fully understood how these irregularities in the steepened edge‐blur profiles contribute to the perceived sharpness of moving objects. To better understand the consequences of several motion‐blur reduction techniques, a perception experiment is designed to evaluate the perceived sharpness of typical motion‐induced edge‐blur profiles at several contrast levels. Relevant characteristics of these profiles are determined on the basis of the perception results by means of regression analysis. As a result, a sharpness metric with two parameters is established, where one parameter relates to the edge slope and the other to the overshoot/undershoot part of the motion‐induced edge‐blur profile.

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30.2: Guiding Principles for High Quality Motion Picture in AMLCDs Applicable to TV Monitors

Cited by 40 publications

References 1 publication

The effect of FLCoS‐display hold time on the perceived blur of moving imagery

The effect of FLCoS‐display hold time on the perceived blur of moving imagery

Temporal Properties of Liquid Crystal Displays: Implications for Vision Science Experiments

A perceived sharpness metric based on the luminance slope and overshoot of the motion‐induced edge‐blur profile

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