| Patent application number | Description | Published |
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| 20110024878 | SEMICONDUCTOR SUBSTRATE AND METHOD FOR MANUFACTURING THE SAME - Provided is a semiconductor substrate and a method for manufacturing the same. The semiconductor substrate includes a substrate, a discontinuously formed hemispheric metal layer on the substrate, and a semiconductor layer on the hemispheric metal layer. A plurality of voids on the interface of the substrate and discontinuous hemisphere are formed to absorb or relax the stain of interface. Accordingly, even if a subsequent layer is relatively thickly formed on the substrate, substrate bow or warpage can be minimized. | 02-03-2011 |
| 20110101307 | SUBSTRATE FOR SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - Provided are a semiconductor substrate including an uneven structure disposed on a surface of a substrate, a buffer layer disposed on the uneven structure, the buffer layer having an acicular structure, a compound semiconductor layer disposed on the buffer layer to planarize the uneven structure, and a plurality of voids defined between the substrate and the compound semiconductor layer, and a method for manufacturing the same. Thus, since the acicular structure disposed on the uneven structure of the substrate forms the voids on an interface between the substrate and the single crystal GaN layer to relax a stress due to a lattice mismatch and intercept propagation of a breakdown potential, a warpage characteristic of the grown single crystal GaN layer may be reduced, as well as, crystallinity may be improved. | 05-05-2011 |
| Patent application number | Description | Published |
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| 20080204870 | Bag type portable screen device - A bag type portable screen device is disclosed. A screen is coupled with a rotary rod with ½ to ⅓ the size of a conventional screen to complete a screen case. The screen case is coupled with one of upper and lower sides of a bag, and has rings to fix the screen, when the rotary rod rotates to open and use the screen. The screen is released from the rings to carry. The screen may be a fixed type reflective screen whose end is fixed to the bag. Since the bag accommodates a laptop computer, and a projector, the bag type portable screen is convenient to carry, install, and use. | 08-28-2008 |
| 20080239172 | Table type bi-directional imaging apparatus - Disclosed is a table type bi-directional imaging apparatus, in which left and right viewers located at left and right sides simultaneously view the same picture or different pictures. The table type bi-directional imaging apparatus includes a table case having a table shape; a transparent window formed through the center of the upper surface of the table case; and left and right projectors and left and right imaging plates, having a screen structure, bilaterally symmetrically installed at left and right sides of the inside of the table case. In the table type bi-directional imaging apparatus, left and right projection distances to project pictures on large-sized screens and left and right viewing distances to view clear pictures are provided within an occupation area of a single table. Further, the imaging apparatus has a table structure, and thus does not require the occupation area of a separate table, thereby minimizing an area for installing the imaging apparatus. | 10-02-2008 |
| 20080291537 | Floor projection screen and method for manufacturing the same - A floor projection screen to be installed in front of department stores, shops, shopping malls, and a method for manufacturing the same are disclosed. The floor projection screen is formed by overlapping a hard screen material, which is obtained by mixing white cement with a light diffuser such as glass beads, silica, etc. having a particle of 400 to 800 mesh, or by mixing plastic resin with white cement, calcium material, pigments, etc., and a soft material such as urethane, rubber, or non-woven fabrics, thereby achieving vivid imaging, an anti-skid function, and durability for friction. The floor projection screen is manufactured by stacking a screen material on a surface of a tape-shaped soft material and rolling and hardening the screen material to complete a screen having a centric ring pattern, or by stacking a screen material on a surface of a tape-shaped soft material, repeating the stacking step until a desired size of the screen is obtained, and hardening the resulting stack to achieve a screen surface having a particle size of 40 to 800 mesh. | 11-27-2008 |
| 20090027632 | Bag type presentation apparatus - A bag type presentation apparatus is disclosed. The apparatus includes a bag-shaped case body having an upper case and a lower case, a curved reflective screen having a focus, and a small projector. The reflective screen is mounted at an inner surface of the upper case and has a reflectance of 4 to 50%. The reflective screen is a curved or spherical reflective screen or a fresnel reflective screen, to straightly reflect a light projected from the small projector located at the focal position thereof, thereby preventing a hot spot and realizing a high screen brightness of 4 to 50 times that of a conventional screen. The projector uses a LED as a light source and has a weight and volume of a fourth that of a conventional projector. The projector is positioned at a focal position of the reflective screen based on the curvature of the reflective screen when in use, and is received in the bag-shaped body case when being carried. | 01-29-2009 |
| 20090219616 | Theater-type projection screen - A theater-type projection screen is disclosed, which is capable of achieving a theater-like stage structure with one projection screen, being implemented in a wall-mounting form or in a stand form. The theater-type projection screen comprises a screen frame formed in a dual structure including an outer frame and an inner frame which are separably connected to each other. The outer frame is made of various materials and in various designs, and structured as a theater stage having a predetermined space allowing movement of a stage curtain therein. The inner frame is equipped with a motor, a fixing shaft, a rotational shaft, and a static screen. According to this structure, the theater-type projection screen is capable of implementing a theatrical atmosphere when in use, and protecting a surface of the projection screen while showing an aesthetic design thereof when not in use. | 09-03-2009 |
| 20100073767 | TRANSMISSION SCREEN FOR STEREOSCOPIC IMAGES - A transmission type screen for stereoscopic images having a transmission layer includes an incident surface having a gloss surface, a transmission layer having a refractive index less than 1.55, a transmissivity more than 60%, and an imaging surface having surface particle sizes of 40 to 400 mesh that avoids a hot spot. The imaging surface is formed on the final surface through which images are transmitted, so that the components operate in an organic fashion with respect to each other. The polarization degree of stereoscopic images is maximized thereby increasing the three-dimensional effect and the transmissivity, and enables viewers to view images clearly several times better than with a conventional screen. | 03-25-2010 |
| 20110013276 | THREE DIMENSION LEAFLET FOR ADVERTISING - The present invention relates to a three dimension leaflet for advertising wherein lens plate is movable on a surface of three dimension image so that a several three dimension images are observed, comprising an advertising face on a front surface of the leaflet and a several three dimension image faces on a rear surface thereof wherein left and right images, a middle blocking plate and lens plate are provided on the three dimension image face, so that the leaflet is collapsible to form a thin configuration when it is carried, and focusing distances of the left and right lens are fixed stably by the middle blocking plate when it is used and further the three dimension image is observed obviously through external light. | 01-20-2011 |
| 20110156403 | SYMMETRICAL DUAL-STRUCTURED WIND POWER GENERATION SYSTEM - A wind power generation system using the Bernoulli principle, includes elongated tube, wind entry and exit openings on opposite ends of a main body of the tube, a central wind passing section of the tube having a smaller diameter than that of the wind entry and exit openings between the opposite ends, support struts spanning the wind entry and exit openings, and left and right power generators arranged centrally of the support struts, with the generators being rotated simultaneously on a single rotation shaft axle. Plural wind turbines are provided left-right symmetrically on the rotation shaft axle, and transverse rotation bearings are provided on the lower and upper part of the wind passing tube, so the tube can pivot into the wind via vanes, thereby doubly increasing power generation efficiency compared to the prior art. | 06-30-2011 |
