| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 359454000 |
Unitary sheet comprising plural refracting areas
| 34 |
| 359461000 |
Roll up screen
| 22 |
| 359459000 |
Unitary sheet comprising plural reflecting areas
| 21 |
| 359449000 |
With reflector or additional screen
| 21 |
| 359452000 |
Embedded particles
| 15 |
| 359460000 |
Rear projection screen
| 13 |
| 359446000 |
Moving during projection
| 9 |
| 359450000 |
Border, mask, shade, or curtain
| 6 |
| 359448000 |
With lens (e.g., camera obscura, etc.) | 3 |
| 20080252969 | Imaging Apparatus - Imaging apparatus including image creation means for creating a moving image, means for enlarging the image, and a screen on which the image is displayed in use to a viewer. The image creation means includes a substantially planar image creation screen on which the image is created. | 10-16-2008 |
| 20100091365 | Screen - A screen adapted to a projection device having a transparent layer, a plurality of light-mixing chambers, and a plurality of lens structures is provided. The light-mixing chambers are located on a back surface of the transparent layer away from the projection device. The lens structures are disposed on a front surface of the transparent layer facing towards the projection device and corresponding to the light-mixing chambers respectively. The size of the opening of the light-mixing chamber is smaller than the size of the bottom surface of the corresponding lens structures. The lens structure is adapted to refract a light beam from the projection device, and the opening of the corresponding light-mixing chamber is adapt to allow the light beam pass through, such that the corresponding light-mixing chamber is adapted to concentrate the light beam therein and transform the light beam into a light beam projected out of the screen. | 04-15-2010 |
| 20120229895 | SCREEN - A screen on which an image according to light incident thereon is displayed includes a plurality of lens trains on a light-exiting surface from which the light exits, and the plurality of lens trains are provided along a plurality of virtual reference lines extending in respective predetermined directions. Each of the lens trains is formed of a plurality of lens elements from which the light exits. At least some of the plurality of lens elements that form any of the lens trains are so disposed that the lens elements are shifted from the reference line along which the lens train extends. The screen can suppress degradation of a displayed image. | 09-13-2012 |
| 359444000 |
With sound producer | 3 |
| 20100290113 | TRANSPARENCY AND BACKLIGHT FOR CINEMA SCREEN - A cinema screen may include a housing including at least one of wood and polymer and configured to hold the cinema screen by at least one of gluing and pinching. The screen may include a metalloplastic multi-layer film coupled to the housing and have a relatively small thickness. The multi-layer film may also have a bottom layer that may be translucent and other layers of multi-layer film may be transparent. The screen may also include a plurality of lamps to provide light. The multi-layer film may be configured to diffuse the light, which may be softly filtered thereby to reduce contrasts, and increase a quantity of light information in front of and behind the cinema screen. The light information may vary with a greater softness. The multi-layer film may also be configured to provide relief image playback accuracy. | 11-18-2010 |
| 20120314285 | FOLDABLE PROJECTION SCREEN - The present invention provides a foldable projection screen, which comprises: a first housing capable of being folded for engagement and capable of standing while being unfolded; and a projection screen having its two sides respectively fastened on two sides of the first housing so as to be folded and accommodated in the first housing. With the mentioned structure, the foldable projection screen has advantages of small in volume, light in weight, and easy to be carried around, and applicable in a mini-sized or small projector. | 12-13-2012 |
| 20130010356 | Speckle reduction using screen vibration techniques and apparatus - Disclosed herein are systems and related methods for reducing speckle on display screen. More specifically, screen vibration is used to reduce speckle, and in accordance with the disclosed principles, the vibration may be achieved by using wave-based actuation (e.g., acoustic or electromagnetic waves) to vibrate the screen. In an exemplary embodiment, a speckle reducing system may comprise at least one actuating element located proximate to, but not in physical contact with, a display screen. In addition, the at least one actuating element may be configured to generate waves directed towards the display screen. When the waves impact the display screen, the waves impart vibration to the display screen. | 01-10-2013 |
| 359451000 |
Curved | 2 |
| 20110102889 | Displays - A display screen system comprising a screen, a projector for projecting images onto the screen and a driving mechanism, the system having a flat configuration and a curved configuration, the driving mechanism arranged to move the screen from bring substantially flat when the system is in the flat configuration to being curved along at least one dimension when the system is in the curved configuration. | 05-05-2011 |
| 20120275021 | DEPTH-ENHANCING SCREENS - Depth-enhancing screens for producing a simulated 3D image. According to one aspect, the depth-enhancing screen comprises a Fresnel lens and the screen is adapted to be arranged adjacent an image source such that the Fresnel lens is arranged between the image source and a viewer and the optical centre of the Fresnel lens is offset from the geometric center of the screen. The screen may be formed from multiple overlaying Fresnel lens, which may different optical centers. The Fresnel lenses may be flat or curved along their height and/or width to form an apex in the central region. | 11-01-2012 |
| 359445000 |
Acoustical | 1 |
| 20110157694 | SYSTEM FOR PROVIDING AN ENHANCED IMMERSIVE DISPLAY ENVIRONMENT - An immersive dome includes a number of novel features designed to enhance the performance of the immersive dome over presently-known immersive dome environments. Projectors are mounted in a multi-tier tower, out of sight beneath a viewing platform positioned to provide optimal wrap-around viewing. The projection surface consists of open-cell foam that allows passage of behind-surface sound into the dome while allowing unwanted ambient noise within the dome to escape. A visually-reflective coating, in conjunction with the open cell structure, provides a textured surface that acts as a micro-baffle and suppresses cross-reflection of projected imagery. | 06-30-2011 |
| Entries |
| Document | Title | Date |
|---|
| 20110176208 | Multilayered Fluorescent Screens for Scanning Beam Display Systems - Fluorescent screens and display systems and devices based on such screens using at least one excitation optical beam to excite one or more fluorescent materials on a screen which emit light to form images. The fluorescent materials may include phosphor materials and non-phosphor materials such as quantum dots. | 07-21-2011 |
| 20100053746 | Reinforced Retractable Projection Screen with a Tab Tensioning System and a Border - Various embodiments of this invention disclose a retractable projection screen with a tab tensioning system, a textured textile border that is made from a different material as the screen, an adjustable coupling means, and a metal strip. | 03-04-2010 |
| 20090268286 | Projector screen structure - The invention provides an improved projector screen structure. The improved screen structure is constituted by twist yarns from superfine single yarns and superfine nickel (Ni) chromium (Cr) alloy fiber. Through up-and-down weaving method for plain woven texture, all yarns are arranged in an organized and uniform fashion with tight spacing, so the fine screen constituted by such structure is suitable for any projectors that have different screen requirements and may be used to both front and back projection. The screen produced in this way can also deliver wide view angle, increased color saturation and contrast as well as better layer and three-dimensional effect. Moreover, the screen has zero radiation, low reflection, uniform light absorbance, flatness, antibacterial property, dustproof effect, water cleanability and durability, which are excellent attributes that traditional screens do not have. The present screen further improves comfort level for audiences and meets environmental requirements after disposal. | 10-29-2009 |
| 20090268285 | COLLAPSING PROJECTION SCREEN CONSISTING OF A REFLECTING FABRIC RETRACTED IN A BOX BEHIND A WALL DECORATION - The present invention relates to a device for folding a reflective projection sheet ( | 10-29-2009 |
| 20110222150 | SCREEN UNIT - A screen unit includes: a rectangular screen; fixing assist members provided on the screen along two opposed sides of the screen; first supporting units fixed to two sides of the screen different from the two opposed sides along which the fixing assist members are provided; second supporting units fixed to the screen via the fixing assist members; a first tensioning unit which applies tension in the direction of separating the first supporting units away from each other; and a second tensioning unit which applies tension in the direction of separating the second supporting units away from each other. | 09-15-2011 |
| 20110261450 | PROJECTION APPARATUSES AND ASSOCIATED METHODS - Projection apparatuses and associated methods are provided. A representative apparatus includes: a support frame defining a projection area; a polymeric screen of sheet material sized and shaped to span at least a portion of the projection area; a retention member operative to contact the polymeric screen along an edge thereof; and a tensioning assembly operative to apply tension to the screen via the retention member, the tensioning assembly being operative to selectively reposition the retention member relative to the support frame. | 10-27-2011 |
| 20100053747 | SCREEN - A screen includes: the four arm members have first connection sections, one at each of the first and second support section side extremities, each of the first and second support sections includes at either extremity thereof a second connection section which receives the first connection section, an attachment and detachment of each of the arm members to and from the screen main body is carried out by an attachment and detachment of the first connection section to and from the second connection section, each of the four arm members has a third connection section at the support rod side extremity, the support rod has fourth connection sections which receive, one each, the four arm members, and an attachment and detachment of the arm members to and from the support rod is carried out by the third connection sections and fourth connection sections coming into engagement. | 03-04-2010 |
| 20100079860 | SCREEN - A screen includes: a rectangular flexible screen cloth having which image light is projected; tubular portions provided along respective side edges of the screen cloth; an annular member inserted into the tubular portions; a frame member having a plurality of arm members connected so as to be capable of bending and stretching and assuming a rectangular frame shape in a state in which the plurality of arm members are extended; four hooking portions provided at four corners of the frame member and configured to hook the annular member to position the screen cloth in the frame of the frame member; and a tension applying mechanism provided on the frame member and configured to apply a tensile force to the screen cloth, at least two of the four hooking portions are provided movably inside and outside the frame member, the tension applying mechanism urges the at least two hooking portions outward the frame. | 04-01-2010 |
| 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 |
| 20080291536 | Reflective Screen - The present invention provides a reflective screen which can reflect high contrast images even in a bright environment and can reflect images with superior image color reproducibility, in particular, images substantially free from color change of the images, even when the screen is observed from an oblique direction. | 11-27-2008 |
| 20110222149 | LIGHT-EMITTING APPARATUS, DISPLAY APPARATUS, LIGHT EMITTER, AND METHOD OF FABRICATING LIGHT EMITTER - According to the embodiments, an easy-to-fabricate light-emitting apparatus is provided in which a plurality of phosphors is disposed so as not to overlap each other. The light-emitting apparatus includes a light source that emits excitation light; a substrate having a protrusion and recess configuration where first planes and second planes which intersect the first planes are formed periodically; first phosphor layers formed on the first planes and absorbing the excitation light to emit a first fluorescence; and second phosphor layers formed on the second planes and absorbing the excitation light to emit a second fluorescence with a wavelength different from that of the first fluorescence. | 09-15-2011 |
| 20090316260 | Projection Screen and Method of Constructions - A projection screen apparatus having a retention member configured, in use, to be in contact with at least one surface of a screen along at least a portion of at least one edge of the screen. The projection screen may include polymeric material and the retention member may be bonded to the screen. The retention member may comprise a plurality of apertures and tensioning members extending through the apertures to apply tension to the screen. A portion of each tensioning member extending through the apertures to contact the retention member may be flexible and non-resilient. The retention member may be configured to allow slidable engagement with the plurality of tensioning members. Each retention member may comprise biasing means configured to bias each retention member away from a neighbouring retention member, the biasing means adjustable to vary the bias applied when the screen is in situ. | 12-24-2009 |
| 20100238544 | PROJECTION BACKWALL APPARATUS AND SYSTEM - A collapsible projection backwall system utilizes a short throw projector and a collapsible framework to create a display usable in a small amount of space. The framework is specifically configured to support and appropriately position a flexible screen member so that distortion is avoided. This is particularly significant in situations where a relatively large screen is utilized, which creates the need to maintain appropriate tension upon the flexible screen member. The framework is specifically configured to be slightly canted when in its extended configuration to thereby introduce natural tension forces which will cooperate with the screen fabric to maintain the necessary configuration for the screen. This canted configuration is achieved by configuring a set of corner hinge assemblies and any central hinged assemblies to maintain this natural cant. By maintaining the desired forces on the display screen fabric a more efficient and functional display screen is created. | 09-23-2010 |
| 20090116106 | PORTABLE FRONT PROJECTION SCREENS - Portable front projection screens include: (a) a first panel having opposing primary outer and inner surfaces, the first panel having at least first and second portions that are foldable relative to each other so as to be oriented at an angle relative to each other in an open configuration and closed to a coplanar flat configuration; and (b) a second panel foldably attached to the first panel and having opposing outer and inner primary surfaces. The second panel inner surface comprises a high gain, high Ambient Rejection Ratio projection screen that extends over a major portion of the inner surface. In a closed configuration, the first and second panels reside adjacent and substantially parallel to each other. The first and second panels cooperate to open to a user viewing configuration whereby the second panel is substantially vertical with the projection screen oriented to face forward toward a user and the second portion of the first panel defines a substantially horizontal base with the first portion of the first panel angled upwardly and inwardly from the horizontal base toward the substantially vertical second panel. | 05-07-2009 |
| 20090002816 | Selective Reflecting for Laser Projector - A projection screen for selectively reflecting light from a front projector. The screen includes an etalon coating structure with a first layer of reflective material, a second layer of dielectric material, and a third layer of partially reflective semiconductor material. The projection screen produces a reflection having an asymmetric-shaped response in the visible spectrum. | 01-01-2009 |
| 20120200915 | SCREEN UNIT - A screen unit includes a flexible screen, a pantograph mechanism which expands and stores the screen, a motor which shifts one end of the pantograph mechanism to stretch and contract the pantograph mechanism, and a wire. The screen unit further includes a housing which accommodates these components, and a cover which opens and closes at the time of expansion and storage of the screen. One end of the wire is held by the electric motor, and the other end of the wire is held by the cover, so that the cover can be closed in accordance with the contraction of the pantograph mechanism effected by the motor. | 08-09-2012 |
| 20090021828 | SCREEN - A screen includes plural three-dimensional portions having a concave shape arranged at a front surface side of a screen substrate, wherein the three-dimensional portions are disposed so that the number of the three-dimensional portions provided in a range of a given length along a first direction on the screen substrate which is determined corresponding to at least either one of a direction of a chief ray and a chief direction of outside light is larger than the number of three-dimensional portions provided in a range of the given length along a second direction crossing the first direction and in which the plural three-dimensional portions are arranged so that at least two three-dimensional portions of the three-dimensional portions provided in the range of the given length along the first direction contact each other. | 01-22-2009 |
| 20120147463 | FOLDABLE DISPLAY DEVICE - The invention relates to a foldable display device, consisting of several panels arranged in parallel to each other, which are movably connected with each other. In order to create a display device that may remain locally fixed, there is provided that the display device is not configured simply foldable but in addition is provided with a housing device, which may accommodate the display device in its folded condition. | 06-14-2012 |
| 20110134522 | TILTING, RETRACTABLE SCREEN DEVICE FOR TABLES - Tilting, retractable screen device for tables, which comprises means for guiding the screen between a substantially vertical concealed position in which the screen is located under the surface of the table and a use position in which the screen projects from said surface, in which the guide means are configured in order to guide the table in a movement that takes the screen from the concealed position to a use position, which is tilted with respect to the surface of the table, said movement being composed of a vertical translation until the screen projects substantially from the surface, followed by a rotation that takes the screen to the use position, such that same may be used when tilted but remains vertical when stowed. | 06-09-2011 |
| 20090273833 | Single manufacturing process for great writable and erasable functional projecting screen with developing performance - This is a projecting board combined the function of being a white board and developer, this invention use acrylic resin, polyester, epoxy resin combined to be a bake lacquer by mixed with dayglo, hardener and silver powder, extinction powder . . . etc materials to complete this invention that can be spread on hard or soft boards by rolling or spray after baking, it also can be wrote on the surface by erasable marker and clean it properly, the effect of the light diffusion on the surface do not cause the light faint while projecting, it do not be affected by irradiation while turn on the light indoor or sunlight downpour, the developing effect on the surface can advance the function of projection, to raise the definition, brightness and contrast of projecting reflection, to use the single baking lacquer spray can reach the great value developing effect of writing on the surface, do not need to use multi-layers to save the producing cost. This product can be made projecting screen, white board, wall coverings, plank building material, or metal building material to satisfied any kind of demands. | 11-05-2009 |
| 20090067044 | PROJECTION SCREEN AND COATING - In at least one embodiment of a coating for a projection screen for displaying an image projected as a combination of primary colors, said coating comprises one or more primary pigments, each of said primary pigments corresponding to at least one of said primary colors. In at least one embodiment of a projection screen for displaying an image projected as a combination of primary colors, said projection screen includes a coating for displaying said projected image and a substrate for receiving said coating, wherein said coating comprises one or more primary pigments corresponding to one of said primary colors, one or more reflective pigments, and a transparent medium. | 03-12-2009 |
| 20120008200 | PROJECTION DISPLAY SURFACE PROVIDING ARTIFACT REDUCTION - A projection display surface for reducing speckle artifacts from a projector having at least one narrow band light source having an incident visible wavelength band, wherein the incident visible wavelength band has an incident peak wavelength and an incident bandwidth, comprising: a substrate having a reflective layer that reflects incident light over at least the incident visible wavelength band; and a fluorescent agent distributed over the reflective layer, wherein the fluorescent agent absorbs a fraction of the light in the incident visible wavelength band and emits light in an emissive visible wavelength band having an emissive peak wavelength and an emissive bandwidth; wherein return light from the projection display surface produced when incident light in the incident visible wavelength band is incident on the projection display surface contains light in both the incident visible wavelength band and emissive visible wavelength band, thereby reducing speckle artifacts. | 01-12-2012 |
| 20120008199 | Structure of the Waterproof Tabletop for the Touch Panel - The present invention discloses a structure of the waterproof tabletop for the touch panel, which includes: a tempered glass which is formed together containing an imaging part and a non-imaging part which are formed integrally; a film configured under the tempered glass corresponding to the imaging part and adhered to the tempered glass to form a projection screen; and a bracket configured under the tempered glass and adhered to the tempered glass to support the tempered glass. | 01-12-2012 |
| 20120300297 | TENSIONED PROJECTION SCREEN - A projection screen apparatus having a perimeter frame and a substantially blank screen is provided. | 11-29-2012 |
| 20120314284 | PROJECTION APPARATUSES AND ASSOCIATED METHODS - Projection apparatuses and associated methods are provided. A representative apparatus includes: a support frame defining a projection area; a polymeric screen of sheet material sized and shaped to span at least a portion of the projection area; a retention member operative to contact the polymeric screen along an edge thereof; and a tensioning assembly operative to apply tension to the screen via the retention member, the tensioning assembly being operative to selectively reposition the retention member relative to the support frame. | 12-13-2012 |
| 20110002035 | SCREEN AND PROJECTION SYSTEM - A screen includes: a substrate; and a first color material layer disposed on one surface of the substrate, wherein the first color material layer includes a first color material adapted to absorb light with a part of wavelengths of an incident light, and the first color material has a peak absorption wavelength in a visible light range, and a size of causing Mie scattering on the light in the visible light range. | 01-06-2011 |
| 20100027112 | PROJECTION-TYPE IMAGE DISPLAY APPARATUS - A projection-type image display apparatus includes a screen on which an image is projected; and a frame that holds a periphery of the screen. The frame includes a plurality of frame units that respectively extend along a plurality of sides of the screen and holds a rim of the screen, and a coupling member that couples the frame units that abut at a corner portion. Each end of the coupling member is fitted into an enclosed section formed at a rear portion of each of the frame units at a position hidden behind the screen. | 02-04-2010 |
| 20100027111 | DEVICE AND METHOD FOR ARRANGING A DISPLAY - A device and method for arranging a display allows for the easy installation of a display in a home entertainment system. The flexibility of modem home entertainment/theater systems that include a digital display device permits many different installation options. Thus, the invention facilitates the installation of such a display by aligning a viewing screen with an image from a projection display device on both a horizontal axis and a vertical axis. | 02-04-2010 |
| 20100007949 | INFLATABLE SCREEN WITH FULLY INTERNAL TENSION - An inflatable moving screen system includes an inflatable support structure. The inflatable support structure has at least two horizontal tubes and at least two vertical tubes that collectively form a rectangular frame. A skirt is coupled to one of the horizontal tubes and to both vertical tubes. An air inlet is also provided in the support structure, so that as air is received, it can fill the support structure tubes. A projection surface is disposed within the rectangular frame and is permanently coupled directly to one of the horizontal tubes, to both vertical tubes, and to the skirt. An internal tension mechanism is also included. The skirt may be part of the internal tension mechanism, which is configured to create fully internal tension to stretch the projection screen automatically, by inflation of the four inflatable tubes, and without using external or removable tension mechanisms. | 01-14-2010 |
| 20120229894 | Method and apparatus for managing optical non-uniformities in seaming processes - Methods to substantially reduce or eliminate optical non-uniformity across an interface may also substantially improve the strength and ease of seam manufacturing, including joining substrates. The methods may include managing optical non-uniformities at least by broadening a region over which a change in optical loss may occur and/or by maintaining a substantially constant average optical loss across an interface. The methods may also include forming a seam that substantially reduces the appearance of optical non-uniformities at the seam, which may include maintaining approximately constant average loss in the vicinity of the seam by substantially controlling reflectivity in the vicinity of the seam, in which substantially controlling reflectivity in the vicinity of the seam may include employing a backer treated to minimize optical reflectivity over a range of angles. | 09-13-2012 |
| 20090034068 | Viewing apparatus - An illumination station for viewing reflection copy images such as documents, photos, and the like having a back-plate against which a reflection copy image is disposed for viewing, one or more overhead light sources disposed in a top member, and a reflector at the base of the back-plate configured to reflect incident light on the lower portion of the back-plate. The use of a reflector provides enhanced illumination to the lower portion of the back-plate and therefore improves the uniformity of illumination of the entire back-plate, and, consequently, of the reflection copy image affixed thereto. | 02-05-2009 |
| 20120262784 | METHOD FOR MANUFACTURING ARRAY SUBSTRATE AND ARRAY SUBSTRATE, AND METHOD FOR MANUFACTURING SCREEN AND SCREEN - A method for manufacturing an array substrate includes forming a plurality of holes in a film shape substrate having thermal plasticity, in which the holes have a diameter of 0.25 times to 2 times a thickness of the substrate, and a pitch of 5 times to 40 times the diameter of the holes; and heating a molding member provided with a plurality of convex portions or concave portions in an array pattern, pressing the substrate provided with the plurality of holes, and transferring the plurality of convex portions or concave portions to the substrate. | 10-18-2012 |
| 20080297893 | Pressure sensitive positioning projection screen - A pressure sensitive positioning projection screen is provided for displaying a first projected image and providing a coordinate signal of a pressed position. The pressure sensitive positioning projection screen comprises a screen body having a first and a second insulation layers, a plurality of mutually separated and isolated first electrodes arranged along a first direction and configured in the first insulating layer, and a plurality of mutually separated and isolated second electrodes arranged along a second direction and configured in the second insulating layer, wherein the first electrodes are interlaced with the second electrodes for providing the coordinate signal of the pressed position along the first and the second directions. | 12-04-2008 |
| 20110310478 | PROJECTION DISPLAY SURFACE PROVIDING SPECKLE REDUCTION - A projection display surface for reducing speckle artifacts from a projector having at least one narrow band light source having an incident visible wavelength band, wherein the incident visible wavelength band has an incident peak wavelength and an incident bandwidth, comprising: a substrate having a reflective layer that reflects incident light over at least the incident visible wavelength band; and a fluorescent agent distributed over the reflective layer, wherein the fluorescent agent absorbs a fraction of the light in the incident visible wavelength band and emits light in an emissive visible wavelength band having an emissive peak wavelength and an emissive bandwidth; wherein return light from the projection display surface produced when incident light in the incident visible wavelength band is incident on the projection display surface contains light in both the incident visible wavelength band and emissive visible wavelength band, thereby reducing speckle artifacts. | 12-22-2011 |
| 20120140318 | RETRACTABLE FRAME OF PROJECTION SCREEN - The present invention provides a retractable frame of a projection screen, which comprises: a receiving case; a rolling shaft; a rolling device; a first support rod having one end laterally extended with an engaging plate having a plate hole, two ends of the engaging plate respectively having an engaging surface; a second support rod having one end extended with two engaging arms, and each engaging arm having an engaging hole; a combination member connected with the second support rod and the first support rod; a top supporter; and a projection screen. When being unfolded, the top supporter is upwardly pulled till the connection location of the second support rod and the first support rod being approximately perpendicular, so the engaging arms can be tightly abutted against the end portions of the engaging surfaces for achieving the objective of support. | 06-07-2012 |
