Abstract: An apparatus for manufacturing a heat exchanger including a refrigerant tube, the apparatus including a moving rod movable along a first direction; and a tube expansion body connected to the moving rod to be linearly movable along the first direction, the tube expansion body insertable into a tube base material of the refrigerant tub such that the tube base material is expanded outward when the tube expansion body is inserted into the tube base material of the refrigerant tube, wherein the tube expansion body includes a plurality of groove forming protrusions formed on an outer surface of the tube expansion body so as to extend along a direction inclined with respect to the first direction, the groove forming protrusions form a plurality of grooves on an inner surface of the tube base material, when the tube expansion body is moved to be inserted into the tube base material.

Abstract: A transparent display device has improved transparency. The transparent display device includes a substrate having transmissive areas and a non-transmissive area disposed between the transmissive areas. A first signal line is provided in the non-transmissive area and extended in a first direction. A second signal line is provided in the non-transmissive area and extended in a second direction. A first pixel includes a first subpixel, a second subpixel and a third subpixel, which are overlapped with at least a portion of the second signal line and disposed substantially in a line in the second direction. A second pixel disposed adjacent to the first pixel includes a first subpixel, a second subpixel and a third subpixel, which are overlapped with at least a portion of the second signal line and disposed substantially in a line in the second direction. The first pixel and the second pixel are disposed between two transmissive areas.

Abstract: The present invention relates to a composite optical sheet, characterized in that two or more optical sheets regularly arranged with micro lenses each having a lens pitch of 1˜30 ?m are stacked to prevent the moire phenomenon, and brightness-improving sheets with different sizes of lenses are formed to maximize the brightness.

Abstract: The present invention relates to a regular pattern optical sheet, the sheet including a transparent flat plate-shaped body, and a plurality of lens-shaped patterns regularly formed at one surface of the body, each having a same size of more than 0.1 ?m but smaller than 25 ?m in diameter, an angle formed by at least one line of lines straightly connecting each center of the plurality of lens-shaped patterns, wherein a horizontal axis of an LCD pixel formed at an upper surface of the body is more than 5.5° but smaller than 9.5°, and a discrete distance between the plurality of lens-shaped patterns is more than 5% but smaller than 15% of a diameter of the lens-shaped pattern.

Abstract: The present invention relates to a composite optical sheet, characterized in that two or more optical sheets regularly arranged with micro lenses each having a lens pitch of 1˜30 ?m are stacked to prevent the moire phenomenon, and brightness-improving sheets with different sizes of lenses are formed to maximize the brightness.

Abstract: The present invention relates to a regular pattern optical sheet, comprising: a transparent flat plate-shaped body; and a plurality of lens-shaped patterns regularly formed at one surface of the body, each having a same size of more than 0.1 ?m but smaller than 25 ?m in diameter, wherein an angle formed by at least one line of lines straightly connecting each center of the plurality of lens-shaped patterns and a horizontal axis of an LCD pixel formed at an upper surface of the body is more than 5.5° but smaller than 9.5°, and a discrete distance between the plurality of lens-shaped patterns is more than 5% but smaller than 15% of a diameter of the lens-shaped pattern, whereby a high luminance characteristic can be accomplished over the conventional irregular lens pattern arrangement to the betterment of power consumption and environment friendliness.