Topic
Overhead projector
About: Overhead projector is a research topic. Over the lifetime, 365 publications have been published within this topic receiving 2621 citations. The topic is also known as: OHP & Overhead projectors.
Papers published on a yearly basis
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Papers
TL;DR: For instance, the Campus Computing Survey as mentioned in this paper found that the proportion of college courses (and by extension, college faculty) using information technology as an instructional resource has increased significantly over the last decade.
Abstract: pundits frequently comment that the pace of innovation in higher education can be measured by the 40 years it took to get the overhead projector out of the bowling alley and into the classroom. The (few) pundits who know something about both bowling and technology often add that faculty are now far more likely to find computerized projection systems in bowling alleys than in college classrooms. But something significant is happening. Fueled by more than four decades of aspirations and a dozen years of sustained (if often ad hoc) experimentation, information technology has finally emerged as a permanent, respected, and increasingly essential component of the college experience. New data from the annual Campus Computing survey, now in its sixth year, indicate a major gain in the proportion of college courses (and by extension, college faculty) using information technology as an instructional resource. These data reveal that the use
83 citations
Patent•
20 Jun 1988
TL;DR: In this article, the authors demonstrate the use of a computer terminal with a projection module supported on a standard overhead projector, which includes a frame which is adapted to rest on an illumination window of the overhead projector and a transmissive liquid crystal display is mounted in the frame parallel to the illumination window.
Abstract: Apparatus for demonstrating the use of a computer terminal comprises a projection module supported on a standard overhead projector The projection module includes a frame which is adapted to rest on an illumination window of the overhead projector A transmissive liquid crystal display is mounted in the frame parallel to the illumination window such that an image on said liquid crystal display is projected by the projector A transparent touch screen is also mounted in the frame overlaying the liquid crystal display By means of a stylus, a user touches the touch screen and thereby designates desired text and/or images for subsequent display Coupled to the decoder is a computer which retrieves the desired text and/or images which are then transmitted to a display driver The aforesaid apparatus is most suited to demonstrate a computer terminal which has a touch screen for selecting text and/or images for display
70 citations
Patent•
27 Jun 1995
TL;DR: An overhead projector for use with a flat panel display assembly is described in this article. But the overhead projector does not provide cooling for the LCD flat panel when used in an overhead projection configuration.
Abstract: An overhead projector for use with a flat panel display assembly. The specialized overhead projector provides cooling for the LCD flat panel when used in an overhead projection configuration. The projector contains a rail on which the flat panel display is positioned for alignment and to provide air passage there through for cooling. A clamping mechanism is also described for securing the flat panel display to the projector. The flat panel display is a back-lit flat panel display subsystem for direct viewing as a monitor and also has overhead projection capability. The display subsystem contains a removable door assembly which provides for back-lighting for direct viewing. When the door assembly is removed, the active matrix LCD is semi-transparent and can be placed over the imaging screen of the overhead projector such that the LCD color image can be thus projected. The lamps that provide the back-lighting remain within the display subsystem when the door is removed and a unique optical coupling is provided between the lamps and a light pipe within the door. The display subsystem contains a sensor detecting door presence and simultaneously shuts off the lamps and reverses the display image upon door removal for overhead projection capability.
68 citations
Book•
1 Jan 2008
TL;DR: In Tools of American Mathematics Teaching, 1800-2000, Peggy Aldrich Kidwell, Amy Ackerberg-Hastings, and David Lindsay Roberts present the first systematic historical study of the objects used in the American mathematics classroom.
Abstract: From the blackboard to the graphing calculator, the tools developed to teach mathematics in America have a rich history shaped by educational reform, technological innovation, and spirited entrepreneurship. In Tools of American Mathematics Teaching, 1800-2000, Peggy Aldrich Kidwell, Amy Ackerberg-Hastings, and David Lindsay Roberts present the first systematic historical study of the objects used in the American mathematics classroom. They discuss broad tools of presentation and pedagogy (not only blackboards and textbooks, but early twentieth-century standardized tests, teaching machines, and the overhead projector), tools for calculation, and tools for representation and measurement. Engaging and accessible, this volume tells the stories of how specific objects such as protractors, geometric models, slide rules, electronic calculators, and computers came to be used in classrooms, and how some disappeared.
65 citations
TL;DR: Use of technology in education has come a long way since the earliest times of human civilization and the newer educational technology can be effective tools of teaching and learning in this rapidly changing technological world.
Abstract: Teaching and learning - the passing of knowledge from one generation to another - has been in existence from the earliest times of human civilization. It began in 1801, with a large piece of slate hung on the wall in a school in Scotland to provide information to a large audience at one time. In the US by mid-19 th century, every class room had a blackboard to teach students. The modern version of the blackboard is either green or brown board. This was introduced in late 1960s. The whiteboards came into use during the late 1980s. Projected aids have been used since 1420. The various devices used are the epidiascope, slide projector, overhead projector for transparencies and the micro projector. An instrument to project images from a horizontal surface onto a vertical screen was invented in the 1870s. By the 1960s, transparencies were in use in classrooms. The ‘Hyalotype’, a transparent image of a photograph using actual black and white photographs on a glass slide that could be projected was invented in 1851. By 1916, the German company Agfa started producing colored lantern slides. The first version of PowerPoint was released by Microsoft in the year 1990. Cell phones, palmtops, and handheld computers; tablets, laptops, and media players are included under mobile learning devices. With the evolution of technology, students achieved competence and interested in interactive learning. The education industry has moved from distance learning to e-learning and finally to m-learning as knowledge expanded exponentially and the demand escalated. While using teaching aids with advanced technology, we must not forget the lessons from the past, striking a balance between embracing new methods of teaching and learning while upholding the timeless principles of education. The newer educational technology can be part of a comprehensive system for lifelong education.
63 citations
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Performance Metrics
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| 2024 | 4 |
| 2023 | 4 |
| 2022 | 6 |
| 2021 | 1 |
| 2020 | 2 |
| 2019 | 1 |