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A Dynamic Overhead Projector Screen Disclosure Number: IPCOM000015833D
Original Publication Date: 2002-May-16
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue



Presenting information using projected images is currently limited to two dimensions, in that images are projected onto flat screens. Therefore, a way is needed to make the projected images three-dimensional. This can be solved by using an elasticised screen which has different areas of the originally flat screen moved towards and away from the observer. This is done by means of many arms pushing and pulling different areas of the screen, and is controlled by the presenter via an electrical system. The resulting effect is tailor made relief in the screen, which can change and stay still at the request of the presenter. Images are projected onto the reliefed screen, making the image three-dimensional. The arms are attached to the back-face of the screen, hidden from the observer, by rubber sockets which are similar to plungers used to unblock sinks and baths. Rubber is used so that the pressure on the screen is distributed over a relatively large area gradually, as illustrated in Diagram 1. This stops a sharp point being created on the screen by the arm. The number of arms attached to the screen will vary depending on the screen model, however, in all models the arms will always be equally distributed across the back-face of the screen. Different screen models will only differ in the number of arms they have, and the number is chosen depending on the amount of detail required in the relief, and this is determined by the particular application of the screen. Each arm is attached to a structure and moves the screen mechanically at right angles to the originally screen face direction. Diagram 1 illustrates the mechanics of the invention. The projected images become three-dimensional. When the screen moves, there is a distortion in the image. Take for example the still picture of a fire on an overhead projector screen that moves under the influence of a draft in the room. As ripples move up the screen, due to the draft, the picture of the fire is distorted and the strange effect 1