Abstract: Disclosed is a system for playing multimedia for a PDF document-based e-book. According to one embodiment of the present invention relating to the system for playing multimedia for a PDF document-based e-book, it is possible to map an object, such as text and an image, of an e-book document having multimedia content, and to play/stop the multimedia content of the document according to the request of a user.

Abstract: A ground radiation antenna is disclosed. Herein, the ground radiation antenna provides a radiator-forming circuit, which is formed to have a simple structure using a capacitive element, as well as a feeding circuit suitable for the provided radiator-forming circuit. Thus, the structure of the antenna becomes simpler and the size of the antenna becomes smaller. Accordingly, the fabrication process of the antenna is simplified, thereby largely reducing the fabrication cost.

Abstract: An antenna according to an embodiment includes a substrate; a radiator; a ground plane spaced apart from the radiator; a feeding pin for feeding an RF signal; a first branch reactance at one side of the feeding pin, the first branch reactance including one end connected to the substrate and an opposite end connected to the ground plane; and a second branch reactance at an opposite end of the feeding pin, the second branch reactance including one end connected to the substrate and an opposite end connected to the ground plane.

Abstract: The present invention relates to display devices, and more particularly to an optical sensing frame in which an infrared sensor module is fastened to a case top with a bracket to secure an assembly margin and prevent the infrared sensor module from mismatching with a liquid crystal display module by relative movement; and a display device therewith, the optical sensing frame includes a case top having a frame shaped upper side, and sides bent and extended from four sides of the upper side perpendicular thereto, first to third brackets fastened to an inside of the upper side of the case top at three corners thereof respectively, and an infrared sensor module placed in each of the first to third brackets.

Abstract: A ground radiation antenna is disclosed. Herein, the ground radiation antenna provides a radiator-forming circuit, which is formed to have a simple structure using a capacitive element, as well as a feeding circuit suitable for the provided radiator-forming circuit. Thus, the structure of the antenna becomes simpler and the size of the antenna becomes smaller. Accordingly, the fabrication process of the antenna is simplified, thereby largely reducing the fabrication cost.

Abstract: An assembly includes a display panel having four corners, an optical sensing frame having at least three optical modules mounted adjacent a surface of the display panel, where the optical modules are located at the corners of the display panel and optical reflectors extending substantially along an entire length of each of four sides of the display panel, an optical sensing frame controller driving the optical sensing frame, and a display panel controller on a single circuit board with the optical sensing frame controller.

Abstract: A system for playing multimedia is provided which includes: a printed matter printed with special ink; a plurality of pattern recognition units including a sensor recognizing a material of the printed special ink and outputting a corresponding electrical signal, which transmits an identity code depending on the electrical signal corresponding to the material and an identification number stored to identify at least one pattern recognition unit of the pattern recognition units; a selection unit receiving the identity code and the identification number and, when the identification number corresponds to a selection signal indicating a pattern recognition unit selected by a user among the pattern recognition units, transmitting the identity code and the identification number; and a content playing unit generating and transmitting the selection signal to the selection unit and receiving the transmitted identity code and identification number and extracting and displaying multimedia contents corresponding to the ide