Design and Implementation of Backlight Module of High Dynamic Range Video Display System Based on Geometrical Optics

Tao, 张涛 Zhang; Liang, 邱 亮 Qiu; Hongying, 巫红英 Wu; Zhichun, 雷志春 Lei

doi:10.3788/lop54.100801

Cited by 3 publications

(2 citation statements)

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“…Helge Seetzen et al dynamically controlled the LED backlight through zoning lighting, which improved the dynamic range but was restricted by partitions number for achieving optimal display. For laser display, it was not practical to achieve thousands of independent partition lighting [9][10][11] . Y. Kusakabe et al utilized a LCoS (Liquid Crystal on Silicon) spatial light modulator as a solution for dynamic contrast ratio enhancement.…”

Section: Introductionmentioning

confidence: 99%

Laser light illumination modulation and HDR implementation method based on PLM device

Li,

Guo,

Yuan

et al. 2024

Emerging Digital Micromirror Device Based Systems and Applications XVI

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Texas Instruments has developed a Phase Light Modulator (PLM) based on Digital Light Processing (DLP) System, which alters the distribution of the light field. This paper explores the fundamental diffraction properties of PLM using the blazed grating model, investigates its capability to steer beams and tests its uniformity as a light field modulator. We selected a typical light field distribution to test the contrast ratio and examined how changing the light field distribution through PLM affects contrast ratio. When there is a single spot area exists in the modulated light field, decreasing the proportion of the individual spot to the entire image area, increases the contrast ratio; When there are multiple spots in the modulated image, increasing their number, decreases the contrast ratio. The feasibility of arbitrarily manipulating light field illumination for display system applications is verified by combining PLM with Digital Micromirror Device (DMD), leading to improved contrast ratios and better realization of High Dynamic Range (HDR) in projected images.

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Section: Introductionmentioning

confidence: 99%

Laser light illumination modulation and HDR implementation method based on PLM device

Li,

Guo,

Yuan

et al. 2024

Emerging Digital Micromirror Device Based Systems and Applications XVI

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“…In order to improve the DR of LCDs as much as possible, in this paper, we adopt LED‐backlight local‐dimming technology, the backlight of a local‐dimming LCD system consists of a two‐dimensional array of LED backlights, each of which illuminates a small region and can be controlled independently. In another work, T. Zhang et al designed and implemented the LED‐backlight module of the HDR display system. The LED‐backlight local dimming is one of the most promising techniques to improve the DR of LCDs, enhance the visual quality, and reduce the power consumption.…”

Section: Introductionmentioning

confidence: 99%

High‐performance local‐dimming algorithm based on image characteristic and logarithmic function

Zhang

Wang

et al. 2018

J Soc Info Display

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With the emergence of high-dynamic range (HDR) image and video, displaying an HDR image or video on a standard dynamic range displays with natural visual effect, clear details on local areas, and high-contrast ratio has become an important issue. To achieve HDR, local-dimming technique has been commonly practiced. In this paper, we investigate the problem of local dimming for LEDbacklight LC display to provide algorithm support for developing HDR displays.A novel local-dimming algorithm is proposed to improve the contrast ratio, enhance the visual quality, and reduce the power consumption of the LCDs.The proposed algorithm mainly consists of two parts. The first part is a backlight luminance extraction method based on dynamic threshold and the maximum grayscale of an image block to improve the contrast ratio and reduce the power consumption. In the second one, a pixel compensation method based on logarithmic function is used to improve the visual quality and contrast ratio. At the same time, in order to better smooth the backlight diffusion at the edges of the backlight luminance signal to enhance the accuracy of the pixel compensation, we draw on the idea of BMA and improve it to establish the backlight diffusion model with different low-pass-filter templates for different types of blocks. Simulation and measured results show that the proposed algorithm outperforms the competing ones in contrast ratio, visual quality, and power-saving ratio.

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Illumination principle of phase-modulated laser light and application in high-dynamic-range laser display system

Li,

Guo,

Guo

et al. 2024

Opt. Eng.

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Design and Implementation of Backlight Module of High Dynamic Range Video Display System Based on Geometrical Optics

Cited by 3 publications

References 0 publications

Laser light illumination modulation and HDR implementation method based on PLM device

Laser light illumination modulation and HDR implementation method based on PLM device

High‐performance local‐dimming algorithm based on image characteristic and logarithmic function

Illumination principle of phase-modulated laser light and application in high-dynamic-range laser display system

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