Novel screen technology for high‐contrast front‐projection display by controlling ambient‐light reflection

Katagiri, Baku; Miyashita, Tetsuya; Ishinabe, Takahiro; Uchida, Tatsuo

doi:10.1889/1.1821295

Cited by 9 publications

(12 citation statements)

References 5 publications

(4 reference statements)

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“…Meanwhile, we previously devised and developed a high‐gain, high‐performance conference room screen . This controlled the direction of the reflected light within a certain angular range to achieve fairly high gain of G ≒ 3 .…”

Section: Functional Projection Screenmentioning

confidence: 99%

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Diverted corner cube retroreflector (D‐CCR) for functional projection screen

et al. 2019

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We devised and developed functional projection screen for personal use, small meetings, car pillars, and near‐eye projection. The screen deflects incident light from a projector by a fixed angle θview and diffuses in a certain angular range Δθview. We have realized the screen by modifying the fine structures based on the corner cube reflector (CCR) and reported basic concept and optical characteristics at IDW2017 and SID2018. However, there remained issues of light in unnecessary direction and insufficient uniformity of the diffused light. In this paper, we report on further modification of the fine structures by optimizing the inclination angles of three curved surfaces of the CCR that result in change of the diffused light pattern. Consequently, the modifications of the deflection angle θview and the diffusion angle Δθview resulted in significant improvement in the screen characteristics. These new results were applied to the screen for personal use and car pillar applications.

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Section: Functional Projection Screenmentioning

confidence: 99%

“…Variety of screens for front projection have been studied so far, such as matte white diffusive screens, pearl screens, silver screens, and retro screens . A matte screen is a Lambertian type.…”

Section: Introductionmentioning

confidence: 99%

Diverted corner cube retroreflector (D‐CCR) for functional projection screen

et al. 2019

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“…A projection screen is evaluated by the reflection luminance, that is, the gain ( G ) with respect to perfectly diffusing surface, and angular reflection characteristic. By definition, a perfectly diffusing screen is a Lambertian screen, independent of the viewing angle, with a gain of 1.0 …”

Section: Introductionmentioning

confidence: 99%

“…We employ an array of novel micro‐hollow corner cube retroreflectors (CCRs) with a three‐sided curved surface in which the bottom surface is a divergent curved surface (D‐CCR). In this study, we consider hollow D‐CCR; however, the solid D‐CCR (prismatic D‐CCR, filled with optical transparent resin) can also be used whenever a rather wider numerical aperture is required . The screen cell is a pair of D‐CCRs set in up and down positions, that is a rhombus shape (♦), and the screen is similar to rhombille tiling.…”

Section: Introductionmentioning

confidence: 99%

“…By definition, a perfectly diffusing screen is a Lambertian screen, independent of the viewing angle, with a gain of 1.0. [1][2][3][4][5][6] The reflection properties of a screen are defined on the screen surface normal. This definition is based on assumption that a hemisphere located at the center of the screen with Z-axis is perpendicular to the screen.…”

Section: Introductionmentioning

confidence: 99%

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Novel directional projection screen using divergent corner cube retroreflector with a three‐sided curved surface (D‐CCR)

et al. 2018

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We devised and developed a novel directive projection screen for applications such as personal use, small group meeting, automotive pillar, and near‐eye. This screen reflects diffused light at an angle Δθview around a direction deviated by θview from the direction of the projector. By applying this screen to automobiles, for example, by installing a projector at a position slightly shifted from the driver, it is possible to reflect the projected light with high efficiency to a certain range around the face of driver. To realize such a characteristic, a hollow corner cube retroreflector (CCR) was modified as follows. The bottom surface of the CCR was tilted by θview/2 to change the direction of the reflected light by θview from the retroreflection direction. In addition, three sides' surfaces of the CCR were curved, so that the light to be diffused within a designed angle (θview ± Δθview/2). The novel retroreflector CCR (D‐CCR) has a single divergent surface with a three‐sided curved surface. We fabricated a prototype with θview = 10° and Δθview = 16° (i.e., the viewing angle for a single D‐CCR, 10° ± 8°), simulated, and measured its optical properties. We closely confirmed the desired characteristics in which an optical gain of 16 was obtained.

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