A color local dimming algorithm for liquid crystals displays using color light emitting diode backlight systems

Cho, Hyunsuk; Cho, Byong Chul; Hong, Hee Jung; Oh, Eui Yeol; Kwon, Oh‐Kyong

doi:10.1016/j.optlastec.2012.08.041

Cited by 21 publications

(12 citation statements)

References 10 publications

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“…The algorithms were Albrecht's algorithm [6], Cho's algorithm [5], Zhang's algorithm [4], Nadernejad's algorithm [1] and the optimization algorithm [2], [11]. For Albrechts algorithm [6], we have implemented the first two steps (out of three, the third one being optional), which produces a clipper-free result.…”

Section: Methodsmentioning

confidence: 99%

“…In the experiments T H 1 = T H 2 = 0.125. Figure 5 shows the result of the proposed algorithm on different video sequences for segment number 13 of edge-lit display using Cho's algorithm [5]. As can be seen, when the level of flicker is low like the Volcano and Concert sequences, the algorithm preserves the LED values.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, a temporal filter is necessary to reduce the flicker artifact by temporally smoothing the change in the backlight. Figure 2 shows an example of the flickering artifact on an edge-lit display when the Cho algorithm [5] is applied to a video sequence.…”

Section: Flicker Reduction Using Iir Filtermentioning

confidence: 99%

“…Some algorithms use characteristic data of the target image [1], [4], [5], while more complex use the information of the Point Spread Function (PSF) to model light diffusion [2], [3], [6], [7]. By using these algorithms, LCDs achieves high contrast ratio and low power consumption.…”

Section: Introductionmentioning

confidence: 99%

“…Since, this algorithm is simply implemented, it has been generally applied to the local dimming LCDs. However, the MA filtering can not be generalized to the other dimming algorithms like PSF-based or histogrambased algorithms because it uses average luminance value of the target image for removing flickering artifact while most of the backlight dimming algorithm use other features (PSF or histogram) [1], [4], [5]. In addition, it causes a delay in the backlight when a scene change occurs.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Flicker reduction in LED-LCDs with local backlight

Nadernejad

Mantel

Burini

et al. 2013

2013 IEEE 15th International Workshop on Multimedia Signal Processing (MMSP)

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Abstract-Local backlight dimming of LCD with LED backlight can reduce power consumption and improve quality of displayed images and videos. However, important variations of LED over time produce a visually annoying artifact called flickering. In this work, we propose a new algorithm to reduce flickering while maintaining video quality. The proposed algorithm uses an adaptive second order Infinite Impulse Response (IIR) in which coefficients are calculated from the local image features. Experimental results show that the proposed method can reduce flickering while simultaneously keeping similar video quality in terms of PSNR and MSE.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Flicker Reduction Using Iir Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Flicker reduction in LED-LCDs with local backlight

Nadernejad

Mantel

Burini

et al. 2013

2013 IEEE 15th International Workshop on Multimedia Signal Processing (MMSP)

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A rapid local backlight dimming method for interlaced scanning video

et al. 2018

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This paper presents a rapid local backlight dimming method for interlaced video to improve the efficiency of displaying interlaced video. In the proposed method, we combine the line average deinterlacing algorithm with the local backlight dimming algorithm. In order to reduce the computational complexity and the backlight power consumption, three novel methods are proposed. The first is to add the sparse method to process the deinterlaced image. Second, the improved dynamic threshold method is used to calculate the dimming factor. And third, the odd field and even field of the same frame use the same backlight brightness to do backlight dimming. The simulation results show that the proposed method can reduce the computational complexity and power consumption, and the experiment results verify that the method can provide high display effect.

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A laser current control algorithm to avoid color distortion in laser projection displays

Guo

Wang

et al. 2019

J Soc Info Display

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Laser display technology has gradually become an important solution for large screen display. As a mature lighting technology in recent decades, phosphor has been widely used in the field of lighting and display. As a solid‐state light source, it has the advantages of low power consumption, environmental protection, rich color, and dynamic modulation. The luminescent efficiency of phosphors varies with temperature, which results in the nonlinearity of phosphor emission when the light source is dynamically modulated and the color temperature drift of the display image. In this paper, a control model of color temperature of laser TV display changing with laser current and temperature is established. The color temperature of laser TV is corrected by using current compensation control algorithm. The problem of color temperature drift caused by the change of phosphor conversion efficiency with t7emperature is solved. The color temperature deviation is 1118 K in the luminance range of the light source before compensation. By compensating and controlling the laser current, the ratio of blue light and phosphor is constant when the luminance changes, thus ensuring the color temperature constant when the luminance of the laser light source changes. The color temperature deviation is 50 K in the luminance range. By analyzing the different luminance of the display image, the stability of the color temperature is improved.

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A color local dimming algorithm for liquid crystals displays using color light emitting diode backlight systems

Cited by 21 publications

References 10 publications

Flicker reduction in LED-LCDs with local backlight

Flicker reduction in LED-LCDs with local backlight

A rapid local backlight dimming method for interlaced scanning video

A laser current control algorithm to avoid color distortion in laser projection displays

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