Highly-Efficient Backlight for Liquid Crystal Display Having no Optical Films

Okumura, Takamitsu; Tagaya, Akihiro; Koike, Yasuhiro; Horiguchi, Masahiro; Suzuki, Hiromasa

doi:10.1080/15421400490483014

Cited by 9 publications

(6 citation statements)

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“…Besides, surface irregularities and mis-machining tolerance in fabrication process also result in the slightly lager angular distribution. Compared with the prior-arts [3][4][5][6][7][8][9][10][11][12], the novel architecture can compress lights in dual directions with high collimation (from FWHM ± 10°~ ± 20° to ± 4°). Moreover, no additional optical film needed, thus, compact form can and benefit mass production and cost.…”

Section: Resultsmentioning

confidence: 99%

“…But LGPs in these systems cannot control the illumination angle. Recently, Okumura et al have reported a highly efficient HSOT backlight system without optical sheets which can control the light directly into the front direction, but the LGP based on micro-prism structures is made of a HSOT polymer, not a traditional acrylic material, polycarbonate (PC) material, or polymethyl methacrylate (PMMA) material [12]. Moreover, most of the technologies mentioned above have the same issue that only one direction of the rays can be compressed with the FWHM ± 10°~ ± 20°, but the light leakage still exists in the other direction.…”

Section: Introductionmentioning

confidence: 99%

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High directional backlight using an integrated light guide plate

et al. 2015

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A high directional backlight system that combined a composite microstructure light guide plate (LGP) with a collimated light source was proposed for eco-displays. The collimated planar light was expanded from a point light source and guided towards the normal direction by utilizing the micro-prism array on LGP. High uniformity of spatial luminous, 91%, with a narrow viewing cone of ± 4° can be achieved without additional optical films. Moreover, compared to the conventional backlight, only 5% of power consumption was needed to keep the same luminance, hence, the optical efficiency increased by a factor of 1.47.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High directional backlight using an integrated light guide plate

et al. 2015

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“…In the case of flexible, thin and lightweight applications, an edge-lit configuration (indirect illumination) is often favored, where the light needs to be scattered as a function of distance from the source, and light extraction is at an angle normal to injection. Ray-tracing simulations were shown to be useful for the design of various beam shaping features for optimized light-guide plate design [2][3][4][5][6][7][8][9][10][11][12]. However, the beam shaping features were optimized for flat display applications.…”

Section: Introductionmentioning

confidence: 99%

64‐3: Simulation of Beam Shaping by Micro‐textures for Curved Displays

Aeberhard

Hiestand

Ruhstaller

2020

Symp Digest of Tech Papers

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We simulate the guiding and out-coupling of light in strongly curved backlight units with edge illumination using a 3D raytracing tool with custom light emission and scattering features. The impact of the display curvature is assessed regarding the uniformity and angular characteristics of light outcoupling in a complex backlight with position-dependent bottom roughness, a diffuser element and a textured brightness enhancement film.

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“…This backlight exhibited approximately three times higher luminance and 20% efficiency than conventional flattype backlight. Okumura et al [3] proposed a highly efficient backlight with microspherical particle for thin LCD applications. The modeling simulation program employed a Monte Carlo method based on Mie scattering theory.…”

Section: Introductionmentioning

confidence: 99%

A Novel Continuous Extrusion Process to Fabricate Wedge-Shaped Light Guide Plates

Hsiao

Lin

Huang

et al. 2013

International Journal of Polymer Science

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Backlight modules are key components in thin-film transistor liquid crystal displays (TFT-LCD). Among the components of a backlight module, the light guide plate (LGP) plays the most important role controlling the light projected to the eyes of users. A wedge-shaped LGP, with its asymmetrical structure, is usually fabricated by an injection proces, but the fabrication time of this process is long. This study proposes a continuous extrusion process to fabricate wedge-shaped LGPs. This continuous process has advantages for mass production. Besides a T-die and rollers, this system also has an in situ monitor of the melt-bank that forms during the extrusion process, helping control the plate thickness. Results show that the melt bank has a close relationship with the plate thickness. The temperature of the bottom heater and roller was adjusted to reduce the surface deformation of the wedge-shaped plate. This continuous extrusion system can successfully manufacture wedge-shaped LGPs for mass production.

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Highly-Efficient Backlight for Liquid Crystal Display Having no Optical Films

Cited by 9 publications

References 0 publications

High directional backlight using an integrated light guide plate

High directional backlight using an integrated light guide plate

64‐3: Simulation of Beam Shaping by Micro‐textures for Curved Displays

A Novel Continuous Extrusion Process to Fabricate Wedge-Shaped Light Guide Plates

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