Abstract: Provided is an electronic device into which a card having a connection terminal is inserted. The electronic device includes a circuit board; a card connector which is mounted at a circumference of the circuit board and includes a signal terminal; and a card guiding unit which guides the card during insertion of the card to couple the connection terminal and the signal terminal.

Abstract: Provided is an electronic device into which a card having a connection terminal is inserted. The electronic device includes a circuit board; a card connector which is mounted at a circumference of the circuit board and includes a signal terminal; and a card guiding unit which guides the card during insertion of the card to couple the connection terminal and the signal terminal.

Abstract: Provided are a projection optical system, a projection television, and a method of manufacturing a lens included in the projection optical system. The projection optical system includes lenses for projecting color beams onto a screen. A color filter layer, absorbing at least one of the color beams, is coated on the surface of at least one of the lenses.

Abstract: A projection TV is provided comprising a reflective mirror including an ultra-thin glass substrate having enhanced strength, a reflective layer formed on a surface of the glass substrate to reflect an image, and a protective layer applied to an upper surface of the reflective layer to prevent the reflective layer from being damaged. The reflective mirror minimizes the occurrences of a double image, and a focus characteristic and contrast are enhanced, thereby improving the image quality. In addition, it is possible to make the product lightweight and thus, reduce transportation charges and other manufacturing costs.

Abstract: A lenticular lens sheet having a wide viewing angle, good uniformity, high resolution, and a manufacturing method thereof. The method for manufacturing the lenticular lens sheet includes the steps of preparing a body of the lenticluar lens sheet having on one side thereof a plurality of incoming-side lenticluar lenses which diffuse incident light from at least one light source, laminating a photoresist layer on the other side of the lenticular lens sheet, exposing a part of the photoresist layer to light, and removing the exposed portion to form an anti-reflection layer having a light transmitting portion and an anti-reflecting portion of external light.

Abstract: A rear projector that can be made slim and compact and can prevent image reversal. The rear projector includes a cathode ray tube to scan light and generate an image, a projection lens unit to magnify and project the image generated by the cathode ray tube, a screen on which the projected image is formed, and a reflection optical system interposed between the projection lens unit and the screen to change a path of projected light. The cathode ray tube and the reflection optical system are arranged such that a raster direction of the cathode ray tube and a direction along which the image is formed on the screen are parallel or substantially parallel to each other.

Abstract: A projection apparatus includes a plurality of display devices to generate different color images, a plurality of projection lens units to magnify and project the images generated from the display devices, and a screen to display the projected images. The display devices are three-dimensionally arranged such that the display devices are concentrated around a reference axis that is a central axis of an arrangement of the display devices.

Abstract: A screen having improved contrast, a wide viewing angle, and uniform luminosity and a projection system including the screen are provided. The screen includes a Fresnel lens sheet, a lenticular lens sheet including first cylindrical lenses extending vertically and formed on a surface of the lenticular lens sheet, and a protective sheet including second cylindrical lenses. The second cylindrical lenses extend horizontally and are formed on a surface of the protective sheet. A tinted layer is formed on surfaces of the second cylindrical lenses. The projection system forms on an image on the screen. The image is generated by a display device and magnified and projected by a projection lens unit. Therefore, a viewer can watch the projection system from an angle wider than that provided by conventional projection systems.

Abstract: Provided are a projection optical system, a projection television, and a method of manufacturing a lens included in the projection optical system. The projection optical system includes lenses for projecting color beams onto a screen. A color filter layer, absorbing at least one of the color beams, is coated on the surface of at least one of the lenses.