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  2. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.

  3. LCD projector - Wikipedia

    en.wikipedia.org/wiki/LCD_projector

    Because they use small lamps and the ability to project an image on any flat surface, LCD projectors tend to be smaller and more portable than some other types of projection systems. Even so, the best image quality is found using a blank white, grey, or black [ citation needed ] (which blocks reflected ambient light) surface, so dedicated ...

  4. Projector - Wikipedia

    en.wikipedia.org/wiki/Projector

    Acer projector, 2012 DLP type home theatre projector in use. A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image ...

  5. Audiovisual education - Wikipedia

    en.wikipedia.org/wiki/Audiovisual_education

    A professor using an LCD projector as an instructional aid. Audiovisual (AV) education or multimedia-based education (MBE) is an instruction method where particular attention is paid to the audiovisual or multimedia presentation of the material to improve comprehension and retention.

  6. Filmstrip - Wikipedia

    en.wikipedia.org/wiki/Filmstrip

    Diafilm strip Dukane Record Automatic Filmstrip Projector Dukane Silent filmstrip projector Music captioned filmstrip set, titled "Composers of many lands and many times by Eye Gate House Inc 1954" The filmstrip is a form of still image instructional media , once widely used by educators in primary and secondary schools (K–12) and for ...

  7. Document camera - Wikipedia

    en.wikipedia.org/wiki/Document_camera

    Document cameras were developed to meet increased demand for the ability to project and present original documents, plans, drawings, and objects directly rather than necessitating the prior preparation required for their use as part of an overhead projector-based presentation.