Ultra slim and bendable backlight system with a unified component for liquid crystal display applications

Nagasawa, Atsushi; Eguchi, Toshimasa; Sanai, Yasuyuki; Fujisawa, Katsuya

doi:10.1007/s10043-008-0007-y

Cited by 12 publications

(8 citation statements)

References 8 publications

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“…According to this principle, the étendue is conserved as a cross-sectional area multiplied by the solid angle it subtends [21]. The top cross-sectional area of the microstructures is smaller than the bottom cross-sectional area.…”

Section: A Two-mode Light Extractionmentioning

confidence: 99%

High-efficiency backlight module with two guiding modes

Pan

2014

Appl. Opt.

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We propose a design for a high-efficiency backlight module that does not require a brightness enhancement film (BEF). With the high-efficiency backlight module it is possible to achieve almost the same half-luminance angle as a conventional edge-lit backlight module can achieve. The backlight system is comprised of a crisscross light guide plate (LGP) and one diffuser sheet. The crisscross LGP is composed of a LGP and optically patterned film (OPF). The backlight module allows light to be extracted through the direct guiding mode and top guiding mode, respectively. We controlled arrangement of the microstructures to increase the optical efficiency and the uniformity by two modes. Compared to the conventional edge-lit backlight module, there is a two-fold improvement in both the total optical efficiency and on-axis luminance with the high-efficiency backlight module.

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Section: A Two-mode Light Extractionmentioning

confidence: 99%

High-efficiency backlight module with two guiding modes

Pan

2014

Appl. Opt.

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“…Many authors have addressed this problem in the past. [1][2][3][4][5][6] In the future, a similar study on this subject is desired for our configuration as well.…”

Section: See-through Versionmentioning

confidence: 99%

“…For example, a backlight unit as thin as 0.26 mm has been reported. 6 Therefore, edge-lit units are particularly suited for mobile applications. As a light-guide plate becomes thinner than the emission area of an LED, butt-coupling is not efficient any more.…”

Section: Introductionmentioning

confidence: 99%

Backlight units based on light extraction from a curved optical fiber

et al. 2014

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A backlight unit is constructed by laying out a plastic optical fiber (POF) in a curved trench fabricated in a light-guide plate. First, the light leaks out of the POF at curved sections and enters the plate. Next, the light is extracted from the plate by some microstructures fabricated on the surfaces of the plate. Coupled to a laser diode, its optical power can be efficiently and uniformly delivered over a large area via the POF. In this experiment, we fabricated a 10 cm × 10 cm × 3 mm prototype unit with off-the-shelf components. It becomes seethrough when the space around the POF is filled with index-matching oil. One can build an arbitrary-shaped planar light source by tiling multiple cells and connecting them by a POF. The light inside the POF is depleted as it propagates downstream. This can be compensated by decreasing the radii of curvature. Microstructures on the light-guide plate can distort the passage of ambient light. For a see-through unit, we can distribute them sparsely and/or use absorbers. A see-through backlight unit is a relatively unexplored device, and it might pave the way for new applications.

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“…Our key technologies are "photolithography" and "roll to roll molding (See Figure 2)". KURARAY has many experiences that we have manufactured various optical components, for instance optical disk, lenticular and Fresnel lens for rearprojection TV, light guide plate for LCD, and so on [9,10]. Therefore, a lot of AR HUD suppliers all over the world must be totally satisfied image qualities by KURARAY's MLA screen.…”

Section: Introductionmentioning

confidence: 99%

49‐4: Late‐News Paper: Intermediate Screen Considered Negative Impact by Ambient Light for Augmented Reality Head‐Up Display Systems

Nagasawa

Watanabe

Atsushi

et al. 2019

Symp Digest of Tech Papers

Self Cite

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KURARAY proposes intermediate screen composed of microlens array for augmented reality head-up display. The microlens array screen which has accurate mirror matrix enables to reduce negative impact by ambient light. KURARAY's screen will bring safer and more comfortable drive to all automotive drivers near future. Author Keywordshead-up display (HUD); augmented reality (AR); automobile; micro-lens array (MLA); intermediate screen; exit pupil expander (EPE); diffuser screen; picture generation unit (PGU); DLP; virtual image distance (VID); field of view (FOV); ambient light; glare; postcard effect; mirror matrix (MM); black matrix (BM)

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Ultra slim and bendable backlight system with a unified component for liquid crystal display applications

Cited by 12 publications

References 8 publications

High-efficiency backlight module with two guiding modes

High-efficiency backlight module with two guiding modes

Backlight units based on light extraction from a curved optical fiber

49‐4: Late‐News Paper: Intermediate Screen Considered Negative Impact by Ambient Light for Augmented Reality Head‐Up Display Systems

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