Weighted roll-off scheme to remove block artifacts for low power local dimming liquid crystal displays

Nam, Hyoungsik; Song, Eun-Ji; Kim, Seul-Ki

doi:10.1016/j.optlastec.2013.10.028

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…The power consumption is reduced while the contrast ratio is improved effectively. Backlight smoothing is used to simulate the process of light diffusion, which is a solution to alleviate block artifacts [2,3]. Pixel compensation offsets the luminance reduction caused by the backlight dimming in the backlight extraction process.…”

Section: Introductionmentioning

confidence: 99%

A Stronger Aadaptive Local Dimming Method with Details Preservation

Zhang

Zeng

et al. 2020

Applied Sciences

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Local dimming technology focuses on improving the contrast ratio of the displayed images for a great visual perception. It consists of backlight extraction and pixel compensation. Considering a single existing backlight extraction algorithm can hardly adapt to images with diverse characteristics and rich details, we propose a stronger adaptive local dimming method with details preservation in this paper. This method, combining the advantages of some existing methods and introducing the combination of the subjective evaluation and the objective evaluation, obtains a stronger adaptation compared with others. Besides, to offset the luminance reduction caused in the backlight extraction process, we improve the bi-histogram equalization algorithm and propose a new pixel compensation method. To preserve image details, the Retinex theory is adopted to separate details. Experimental results demonstrate the effect of the proposed method on contrast ratio improvement and details preservation.

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Section: Introductionmentioning

confidence: 99%

A Stronger Aadaptive Local Dimming Method with Details Preservation

Zhang

Zeng

et al. 2020

Applied Sciences

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“…3 For these reasons, LEDs are rapidly penetrating into lighting, full-color display, and traffic signal applications. [4][5][6][7][8][9] On the other hand, the fast response of LEDs enables high speed modulation, which can be used for data transmission. 10 By turning LEDs on and off at high speed, the binary data are wirelessly transmitted and are converted into electrical signals via photo sensors at the other end.…”

Section: Introductionmentioning

confidence: 99%

Short-distance visible light communication with simple clock data recovery for audio applications

Song

Nam

2015

Jnl Soc Info Display

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As light emitting diodes (LEDs) of fast response time are wide-spreading in a variety of applications such as displays, lighting, traffic signals, and automobiles, many researches on transferring the data with the visible lights of LEDs have been conducted. This paper describes such a visible light communication system that supports the audio applications at the short distance up to 80 cm and the data bandwidth of 32 kHz. Especially, a simple clock data recovery (CDR) is used to achieve the optimum sampling and compensate for the frequency offset between transmitter and receiver. The proposed CDR obtains three samples per symbol and then adjusts the sampling point properly with the pattern of three samples over the frequency offset range of ±1.5% without changing the operating frequency of a receiver side. In the prototype system, a transmitter is composed of audio encoder, field programmable gate array, LED driver, and LEDs and a receiver consists of photodiode, comparator, field programmable gate array, and audio decoder. At the distance of 50 cm and the data rate of 32 kbps, the measured bit error rates are 0.101 and less than 10 À8 without and with CDR, respectively.Keywordsvisible light communication, clock data recovery, frequency offset, bit error rate.

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Human visual sensitivity based optimal local backlight dimming methodologies under different viewing conditions

Rahman

You

2023

Displays

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Weighted roll-off scheme to remove block artifacts for low power local dimming liquid crystal displays

Cited by 8 publications

References 10 publications

A Stronger Aadaptive Local Dimming Method with Details Preservation

A Stronger Aadaptive Local Dimming Method with Details Preservation

Short-distance visible light communication with simple clock data recovery for audio applications

Human visual sensitivity based optimal local backlight dimming methodologies under different viewing conditions

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