Tohoku University

Sharp Kabushiki Kaisha Corporation

Sony Corporation

Lintec Corporation

Other

Tohoku Techno-brains Corporation

Aomori Support Center for Industrial Promotion

Takahiro Ishinabe

Tatsuo Uchida

Tohru Kawakami

Yutaka Ishii

Baku Katagiri

Yoshito Suzuki

Yoshihiro Hashimoto

Shuichi Kozaki

Shoichi Ishihara

Kazuo Sekiya

Katsunori Ehara

Yoshitaka Yamamoto

Yasuhisa Itoh

Masahiro Nishizawa

Kozo Nakamura

Akira Ebisui

Satoru Shoshi

Kentaro Kusama

Tomoo Orui

Harumi Sato

Toshiki Matsuoka

Mamoru Mizuno

Masahiro Ikeda

Hideo Fujikake

David James Montgomery

Shogo Shinkai

Tomoaki Suzuki

Shinpei Nagatani

Toru Kawakami

Tetsuya Miyashita

An optical-diffusion film for display which, particularly when applied to a display device using a collimated backlight as a backlight for the display panel, can efficiently diffuse and emit a highly directional light emitted from the collimated backlight toward the front of the display device as image display light, without allowing straight transmission of the highly directional light, and a display device using the optical-diffusion film for display are provided. Disclosed is a single layered optical-diffusion film having a columnar structure in which plural pillar-shaped objects having a relatively high refractive index are arranged to stand close together in a film thickness direction in a region having a relatively low refractive index, in which the film thickness of the optical-diffusion film has a value within the range of 60 to 700 &#x3bc;m, and the haze value obtainable in the case in which light is made incident in the normal line direction of the film plane has a value of 80% or more.

Optical-diffusion film for display and display device using same

Provided are an optical-diffusion film for display which, particularly when applied to a reflective display device, can efficiently diffuse and emit an external light incident from a wide range of angles toward the front of the display device as image display light, and a reflective display device using the optical-diffusion film. Disclosed is an optical-diffusion film for display, which is a single-layered optical-diffusion film obtained by photocuring a composition for optical-diffusion film including two or more kinds of polymerizable compounds having different refractive indices, and in which the film thickness of the optical-diffusion film has a value within the range of 60 to 700 &#x3bc;m, and when a coating layer formed by applying a composition for optical-diffusion film in a film form is photocured, and the incident angle of incident light with respect to the normal line of the film plane is varied in the range of &#x2212;70&#xb0; to 70&#xb0; along the travel direction of the coating layer at the time of photocuring, the haze value at each incident angle has a value of 70% or more.

Optical-diffusion film for display and reflective display device using same

A lighting device () includes: a surface light source (); a first lens (L) having a first focal point (F), the first lens being provided on the light exit surface side of the surface light source; and a second lens (L) having a second focal point (F), the second lens being provided on a light exit surface side of the first lens, the surface light source, the first lens, and the second lens being configured such that a first virtual image (I) is formed by the first lens and a second virtual image (I) is formed by the second lens, wherein the first virtual image (I) is formed between the second focal point (F) and the first lens, and the second focal point (F) is on a side opposite to the light source side relative to a predetermined focal position f'.

Illumination device

A lighting device includes: a light guide plate; a light source; and a light modulation element disposed on a surface of or in the inside of the light guide plate, and adhered to the light guide plate. The light modulation element has a pair of transparent substrates, a first electrode provided on a surface of one of the transparent substrates, a second electrode provided on a surface of the other of the transparent substrates, and a light modulation layer, provided in a gap between the transparent substrates, exhibiting a light-scattering property or a light-transmitting property concerning light from the light source depending on intensity of an electric field. One or both of the first and second electrodes include partial electrodes. First partial electrodes of the partial electrodes are adjacent to second partial electrodes of the partial electrodes, and have irregular shapes on edges adjacent to the second partial electrodes.

Lighting device and display device

To provide a thin optical sheet having improved efficiency for light utilization, an optical sheet () of one mode of the present invention includes, in sequence from a light entry side to a light emission side, a plurality of first prisms (), a &#xbc; wavelength plate (), and a polarized-light separating element (), the plurality of first prisms () each having (i) a first surface () through which light enters the first prism and (ii) a second surface () that reflects the light, having entered the first prism, toward the light emission side, the optical film further including, between the plurality of first prisms in an in-plane direction of the optical film, a second prism () that reflects light.

Optical film

A lighting device () includes: a surface light source (); a first lens (L) having a first focal point (F), the first lens being provided on the light exit surface side of the surface light source; and a second lens (L) having a second focal point (F), the second lens being provided on a light exit surface side of the first lens, the surface light source, the first lens, and the second lens being configured such that a first virtual image (I) is formed by the first lens and a second virtual image (I) is formed by the second lens, wherein the first virtual image (I) is formed between the second focal point (F) and the first lens, the second focal point (F) is on a side opposite to the light source side relative to a predetermined focal position f', and at least either of a light entry surface or a light exit surface of the first lens or the second lens includes a non-revolution surface (SO) as a lens surface, and a plurality of boundary lines (B-B) whose curvatures vary discontinuously are provided in the non-revolution surface.

A backlight system () includes a light emitting section () and an imaging optical system. The imaging optical system includes a first microlens array (MLA) and a second microlens array (MLA). The lenses (A) separates the beams of light emitted from the light emitting section () by RGB, and causes them to be converged at a pitch same as a pitch at which the picture elements are arrayed. The lenses (A) are provided in one-to-one correspondence to the picture elements such that the lenses (A) have their respective focal points at positions onto which beams of light having passed through the lenses (A) are converged. The lenses (A) thus deflect the beams of light which have passed through the lenses (A) in a substantially vertical direction with respect to the display surface of the liquid crystal panel.

Backlight system and LCD device using the same

A backlight system includes: a light-emitting section () having a plurality of light sources that emit beams of light at different dominant wavelengths from one another; and an imaging optical system () including a plurality of microlenses () that focus beams of light emitted from the light-emitting section (), the backlight system irradiating a liquid crystal panel with beams of light having passed through the imaging optical system (), the liquid crystal panel including a plurality of pixels arrayed at a predetermined pitch from each other, on the assumption that the pitch at which the pixels are arrayed is denoted as P and the imaging optical system () has an imaging magnification of (1/n), the light sources () being arrayed at a pitch (P) given as P=n&#xd7;P, the microlenses () being arrayed at a pitch (P) given as P=(n/(n+1))&#xd7;P.

Backlight system and liquid crystal display device using the same

A thin backlight system includes: a light emitting section emitting lights that have different dominant wavelengths; and a plurality of light transmitting portions, the thin backlight system deflecting the lights and then converging the lights on the plurality of light transmitting portions. The thin backlight system further includes: an imaging optical system provided to face surfaces, of the plurality of light transmitting portions, on which the lights are converged. The imaging optical system including a plurality of identical lenses arranged in a vertical and/or a horizontal direction at a pitch determined by multiplying a pitch at which the plurality of light transmitting portions are arranged in a vertical and/or a horizontal direction by the number of types of the different dominant wavelengths and being configured to converge the lights from the light emitting section on light transmitting portions to which the different dominant wavelengths of the lights correspond.

Thin backlight system and liquid crystal display device using the same

A lighting device includes: a light guide plate; a light source disposed on a side face of the light guide plate; and a light modulation element disposed on a surface or in the inside of the light guide plate and adhered to the light guide plate. The light modulation element has a pair of transparent substrates disposed separately and oppositely, a pair of electrodes provided on respective surfaces of the pair of transparent substrates, and a light modulation layer provided in a gap between the pair of transparent substrates. The light modulation layer includes a first region, having optical anisotropy, responsive to an electric field, and a second region, having optical anisotropy, unresponsive to an electric field. The second region has a striped structure with average striped texture size of 0.05 &#x3bc;m to 10 &#x3bc;m both inclusive in a short axis direction.

An illuminating device capable of improving display luminance while decreasing light leakage in a range with a large view angle and a display unit are provided. In a light modulation device bonded to a light guide plate, a light modulation layer containing a bulk and microparticles is provided. Both the bulk and the microparticles have optical anisotropy, and each response speed to an electric field is different from each other. Thereby, by controlling the electric field, each optical axis orientation of the bulk and the microparticles is able to correspond with each other, or is able to be different from each other.

Illuminating device and display unit

An illumination device is provided and includes: a light guide member; a light source provided on one or more side faces of the light guide member; and a light modulating element including a pair of transparent substrates disposed to oppose each other with a gap therebetween, a first electrode provided on a surface of one of the transparent substrates, a second electrode provided on a surface of the other of the transparent substrates, and a light modulation layer provided in the gap and expressing a scattering property or a transparency to light from the light source in accordance with a magnitude of an electric field. The first electrode, the second electrode, or both thereof is patterned, and a density of pattern of the first electrode, the second electrode, or both thereof to which the patterning is applied is varied depending on a distance from the light source.

Illumination device and display device

Surface light source device includes: point light sources (); light guide plate () having (i) two end parts in length direction, one of which serves as incident surface (), and (ii) two end parts in thickness direction which serve as exit surface () and back surface (), light guide plate () directing light, emitted from point light sources (), incident on incident surface (), so as to cause light to exit from substantially entire area of exit surface (); and reflector () which reflects, toward incident surface (), part of light which is emitted from point light sources () and is then reflected from incident surface (). Incident surface () has elliptic arc () which is concave part having surface shape along elliptic arc identical to elliptic arc which is part of ellipse () having two focal points corresponding to point light sources () and reflector (). Point light sources () and reflector () are provided on ellipse focal point lines (and) obtained by moving two focal points in width direction of light guide plate ().

Surface light source device

A dichroic filter column () is provided on an incident surface (). At least one of two end parts of a light guide plate () in a thickness direction is divided into a plurality of light guide paths (), in a width direction of the light guide plate () by a plurality of cutout grooves (). Portions of the plurality of light guide paths () on an incident surface () side are aligned in accordance with positions of a plurality of dichroic filters (), respectively. The plurality of dichroic filters () are elements of the dichroic filter column ().

To realize a diffusion film in which arbitrary control of the diffuse light intensity distribution characteristics, and an angular range of diffusion does not change with respect to an incoming light from a specific angular range and a light-outgoing direction converting element that is high in efficiency of conversion of the outgoing direction, and has no limit in the angle of conversion of the outgoing direction, and to provide a thin-model high-quality projection display using the same as a screen.

Growing community of inventors

Sendai, Japan

Takahiro Ishinabe