Abstract: A diffractive light guide plate including a light guide unit; an input diffractive optical element that receives lights output from a light source and diffracts the received lights to be guided on the light guide unit; and two output diffractive optical elements disposed in a predetermined region of the light guide unit and having different linear grating patterns from each other, wherein the two output diffractive optical elements are configured so that each one output diffractive optical element receives the lights from the input diffractive optical element and allows the received lights to be directed to the other output diffractive optical element by diffraction, and so that each one output diffractive optical element receives lights from the other output diffractive optical element and allows the received lights to be output from the light guide unit by diffraction, and the two output diffractive optical elements having different linear grating patterns are alternately arranged in at least one dimension

Abstract: The present disclosure provides a diffraction light guide plate including: a light guide unit; an input diffraction optical element configured to diffract light which is outputted from a light source and inputted to the input diffraction optical element, to guide the inputted light on the light guide unit; and two diffraction optical elements configured to receive the diffracted light from the input diffraction optical element and one-dimensionally expand the received light by diffraction, wherein each of the two diffraction optical elements receives the expanded light from the other of the diffraction optical elements and outputs the received light from the light guide unit by the diffraction, and there is no region where the two diffraction optical elements overlap each other on the light guide unit.

Abstract: An optical film including a refractive index changing unit region comprising at least one high-refraction unit region and at least one low-refraction unit region, the refractive index changing unit region in which a refractive index varies along the plane direction, is provided. The optical film has excellent abrasion resistance and pressure resistance while having excellent light extraction efficiency.

Abstract: The present disclosure provides a diffraction light guide plate, including a light guide unit, an input diffraction optical device configured to receive light from a light source and diffract the received light, an intermediate diffraction optical device configured to receive the diffracted light from the input diffraction optical device and extend the received light one-dimensionally by diffraction, and an output diffraction optical device configured to receive the extended light from the intermediate diffraction optical device and output the received light from the light guide unit by diffraction. The intermediate diffraction optical device and the output diffraction optical device are separately disposed in regions divided horizontally on the light guide unit, and the intermediate diffraction optical device includes a main intermediate diffraction optical device and an auxiliary intermediate diffraction optical device, which are disposed separate apart from each other vertically on the light guide unit.

Abstract: A plasma etching method using a Faraday cage, which effectively produces a blazed grating pattern.

Abstract: An optical isolation element comprising, sequentially: a light control film; a first optical path changing element; and a second optical path changing element. The optical isolation element has an excellent optical isolation ratio, and can be manufactured simply and at low cost. Such an optical isolation element can be applied, for example, to the fields of optical communication or laser optics, security and privacy protection, and members for brightness enhancement in displays or military products requiring hiding and covering, and the like.

Abstract: The present application relates to a polarization conversion element and an optical isolation device. The present application provides a polarization conversion element capable of converting unpolarized incident light into one polarized light and an optical isolation device with an excellent optical isolation ratio comprising the polarization conversion element. Such an optical isolation device can be applied to various applications such as the field of optical communication or laser optics, the field of security or privacy protection, brightness enhancement of displays, or a use for hiding and covering.

Abstract: A diffraction light guide plate capable of increasing the area of an output image without increasing the total size thereof and having an advantage that the pupil position of a user is not limited. The diffraction light guide plate comprises first and second diffraction optical elements, wherein the first diffraction optical element is an element capable of receiving light incident onto the first diffraction optical element and outputting the received light toward the second diffraction optical element, and the second diffraction optical element is an element capable of emitting light therefrom out of the incident light from the first diffraction optical element.

Abstract: The present disclosure provides a marbled molded product obtained by injection-molding, in a mold cavity, a mixture including: a thermoplastic resin including one selected from the group of polycarbonate, acrylonitrile-butadiene-styrene, polybutylene terephthalate, polypropylene, and combinations thereof; and fine pigment particles, where a pattern forming a texture is formed on the surface of the injection-molded product. The present disclosure also provides a system for evaluating a marble color effect of a marbled molded product, the system including: a light source unit, an image-capturing unit, an image processing unit and an evaluation factor determination unit.

Abstract: The present application relates to an optical isolation device. The present application provides an optical isolation device having an excellent isolation ratio which can be formed simply and at low cost. Such an optical isolation device can be applied to various applications such as the field of optical communication or laser optics, the field of security or privacy protection, brightness enhancement of displays, or a use for hiding and covering.

Abstract: A diffractive light guide plate and a display device including the same, the diffractive light guide plate including a light guide unit; a first diffractive optical element including a linear grating repeatedly formed at a predetermined pitch; and a second diffractive optical element disposed in a region distinct from a region where the first diffractive optical element is disposed and including a two-dimensional pattern provided in a region where a virtual first linear pattern repeatedly arranged at a predetermined pitch along a first direction and a virtual second linear pattern repeatedly arranged at a predetermined pitch along a second direction intersect each other, where a horizontal section of the two-dimensional pattern has an elliptical shape and an angle between the long axis of the elliptical shape and a direction perpendicular to an extension direction of the linear grating in the first diffractive optical element is less than 20°.

Abstract: An asymmetric transmission film including a body having a first surface and a second surface opposite to the first surface and a transmittance control member disposed in the body such that a forward transmittance of light passing in a direction from the first surface toward the second surface and a reverse transmittance of light passing in a direction from the second surface toward the first surface are different from each other.

Abstract: A diffractive light guide plate including a light guide unit; an input diffractive optical element that receives lights output from a light source and diffracts the received lights to be guided on the light guide unit; and two output diffractive optical elements disposed in a predetermined region of the light guide unit and having different linear grating patterns from each other, wherein the two output diffractive optical elements are configured so that each one output diffractive optical element receives the lights from the input diffractive optical element and allows the received lights to be directed to the other output diffractive optical element by diffraction, and so that each one output diffractive optical element receives lights from the other output diffractive optical element and allows the received lights to be output from the light guide unit by diffraction, and the two output diffractive optical elements having different linear grating patterns are alternately arranged in at least one dimension

Abstract: The present application provides a replicating method and a replicating device of a transmission type holographic optical element capable of mass-replicating the transmission type holographic optical element by a continuous and economical process.

Abstract: The present application relates to an optical isolation device. The present application provides an optical isolation device having a high transmittance in a forward direction and an excellent isolation ratio. Such an optical isolation device can be applied to various applications such as the field of optical communication or laser optics, the field of security or privacy protection, brightness enhancement of displays, or a use for hiding and covering.

Abstract: A plasma etching method using a Faraday cage, which effectively produces a blazed grating pattern.

Abstract: The present application relates to a sheet comprising, in a single layer, a first light control part capable of providing light always totally reflected only in a specific interlayer laminate structure among sheet constructions; and a second light control part capable of providing light whose total reflection is determined according to a fingerprint pattern in contact with the surface layer of the sheet by changing a part of the light provided from the first light control part and totally reflected in the specific interlayer laminate structure at a predetermined angle and emitting it to reach the surface layer of the sheet without being totally reflected in the specific interlayer laminate structure, and a device thereof. The sheet has excellent user identification or authentication capability through a fingerprint and can be applied to a large area display device to recognize a plurality of fingerprint patterns without being influenced by each other.

Abstract: A method for controlling a digital device according to the present application can control the device so as to execute a command corresponding to a single fingerprint or a plurality of fingerprints using a sheet capable of simultaneously recognizing a plurality of fingerprints. Accordingly, a user's usability can be greatly improved, and a complicated encryption function using a plurality of fingerprints can be implemented, so that the security of the digital device can be greatly improved.

Abstract: The present application relates to an optical isolation element which sequentially comprises a first optical path changing element, a light control film and a second optical path changing element. The optical isolation element has excellent forward transmittance, which may require no separate external force. The optical isolation element can be applied to various applications such as the field of optical communication or laser optics, the field of security or privacy protection, brightness enhancement of displays, or military hiding and covering.

Abstract: An optical isolation element comprising, sequentially: a light control film; a first optical path changing element; and a second optical path changing element. The optical isolation element has an excellent optical isolation ratio, and can be manufactured simply and at low cost. Such an optical isolation element can be applied, for example, to the fields of optical communication or laser optics, security and privacy protection, and members for brightness enhancement in displays or military products requiring hiding and covering, and the like.