54.1: Comparison of LCD Motion Blur Reduction Methods using Temporal Impulse Response and MPRT

Klompenhouwer, Michiel A.

doi:10.1889/1.2433334

Cited by 30 publications

(27 citation statements)

References 10 publications

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“…This lower threshold is fixed even when typical motion-blur-reduction methods 13,14 are applied to our non-ideal material, e.g., response-time compensation by overshoots and undershoots or frame rate increasing. The backlight flashing technique can improve this lower threshold 16 because the hold principle is avoided in this case.…”

Section: Transient State and Steady Statementioning

confidence: 99%

A straightforward method of measuring MPRT using LC test cells

Cerrolaza¹,

Smet²,

Cerrolaza³

et al. 2010

J Soc Info Display

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A simple method based on integration over time to measure motion-picture response time (MPRT) has been developed. Liquid-crystal response time (LCRT) alone cannot express the motion blur perceived by the observer; one must also take into account the transition between intermediate gray levels and the sample-and-hold effect. The method shows similar results to other previously reported methods based on temporal integration, while being simpler and more straightforward. Indeed, just monopixel test cells are required for measuring MPRT. This method can be used for comparison between different materials, alignments surfaces, or other manufacturing details with no need of fabricating the whole LCD structure. Nevertheless, the method could also be used for characterization of commercial displays with major changes. A comparison of MPRT values for three different liquid-crystal materials is presented in this work. The behavior of the MPRT parameter in the case of an ideal liquid-crystal material with an LCRT equal to zero has also been studied. The results obtained for this material have been used as a reference to establish comparisons with real materials

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Section: Transient State and Steady Statementioning

confidence: 99%

A straightforward method of measuring MPRT using LC test cells

Cerrolaza¹,

Smet²,

Cerrolaza³

et al. 2010

J Soc Info Display

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show abstract

“…The 120 Hz driving method is being adopted in order to reduce a motion blur by inserting a black image between each frame in TFT-LCD displays. [19][20][21] This negative voltage is attributed to decreasing the threshold voltage of the TFT. However, its negative shift is recovered to the initial value by the positive voltage of the effective gate voltage during the driving field when the image is displayed.…”

Section: H492mentioning

confidence: 99%

Negative Data Insertion Method for Suppressing Hysteresis of Polysilicon Thin-Film Transistors

Kim

Han

Lee³

et al. 2008

J. Electrochem. Soc.

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The electrical hysteresis of polysilicon thin-film transistors ͑poly-Si TFTs͒ employing a negative data insertion ͑NDI͒ has been investigated. It is known that the image sticking in active-matrix organic light emitting diode displays using the poly-Si TFT back plane was mainly caused by the hysteresis of driving TFT in a pixel. In this paper, we propose a type of NDI method using inverse data signals in order to suppress the hysteresis of poly-Si TFTs. Experimental results show that the NDI was very effective to reduce the hysteresis level of poly-Si TFTs induced by carrier trapping and detrapping.Active-matrix organic light-emitting diode ͑AMOLED͒ displays have attracted considerable attention among flat-panel displays due to high brightness with low power consumption, light weight, fast response time, wide viewing angle, and self-emissive characteristics. 1,2 Recently, low-temperature polysilicon thin-film transistor ͑poly-Si TFT͒-based AMOLED displays have been commercialized, presenting superiority of image quality. 3 Poly-Si TFTs have been preferred as a back plane of AMOLED displays due to their higher mobility and greater stability compared to hydrogenated amorphous silicon thin-film transistors ͑a-Si:H-TFTs͒. However, poly-Si TFT-based AMOLED displays suffer from the nonuniformity problem caused by irregular characteristics of laser crystallization. In order to overcome the nonuniformity of poly-Si TFTs and make the mass production possible, various kinds of compensation methods 4-6 and different crystallization methods are being introduced continuously. 7,8 Image sticking is another issue in poly-Si TFT-based AMOLED displays, which is known to be caused by the hysteresis of poly-Si TFTs according to different bias stress. 9 Variations in TFT characteristics by the hysteresis occur in different degrees for each pixel, causing each driving TFT in a display panel to have different threshold voltage values. Such an effect is often referred to as differential aging, which causes some undesirable visual defects, such as image sticking or residual image. 9 In order to solve this problem, there are several pixel circuits for driving organic light-emitting diode ͑OLED͒ current that compensates for the variation of TFT characteristics, some of which employ current programming, 4 time ratio gray scaling, 5 or threshold voltage compensating methods. 6 However, these methods require development of complicated source drive integrated circuits and also limit the aperture ratio of pixel due to the complexity of pixel circuit. 10 In this paper, we propose a type of negative data insertion ͑NDI͒ method capable of suppressing the hysteresis of poly-Si TFTs to enhance the image quality of AMOLED displays without the use of any complicated pixel circuit. TFT FabricationIn order to investigate the electrical hysteresis of poly-Si TFTs and the effect of NDI, top-gate p-channel TFTs were fabricated on SiO 2 ͑300 nm͒ stacked as a buffer layer on a glass substrate. A 50 nm thick a-Si film was deposited on the buffer layer by plas...

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“…To simplify a real LC response characteristic, we suppose that an LC response is similar to the step response of an RC(resistorcapacitor) circuit. ( 1 x(0) ) ( (5) In this equation, the coefficient of t -namely, τ(=1/ω s )-determines the rate at which the h(t) approaches zero. And this equation can be applied to analysis of backlight block.…”

Section: Lcd System Modelingmentioning

confidence: 99%

LCD TV comparable to CRT TV for moving image quality: world's best MPRT LCD TV

et al. 2007

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The world's best motion fidelity LCD, which is based on scanning backlight technique, was developed. The MPRT (Motion Picture Response Time) of 4.0 ms for an LCD is achieved while a CRT has about 3.7 ms and a PDP still has about 8.1 ms. It means that the last weakness bothering an LCD so far compared with a PDP and a CRT was cleared. Moreover, 4.0 ms MPRT is a number at which people cannot perceive motion blur for moving images under most conditions and therefore the MBR LCD is superior to a PDP by above 50% and equal to a CRT in motion blur.

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54.1: Comparison of LCD Motion Blur Reduction Methods using Temporal Impulse Response and MPRT

Cited by 30 publications

References 10 publications

A straightforward method of measuring MPRT using LC test cells

A straightforward method of measuring MPRT using LC test cells

Negative Data Insertion Method for Suppressing Hysteresis of Polysilicon Thin-Film Transistors

LCD TV comparable to CRT TV for moving image quality: world's best MPRT LCD TV

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