VAE 311: Principles and Techniques of Veterinary and AH Extension (2+1)

Handling and use of multimedia projector

EXERCISE-3: HANDLING AND USE OF MULTIMEDIA PROJECTOR 

• A "multimedia projector" is defined as the one that will project images from computers as well as standard video devices (e.g. DVD player). Multimedia is the Combination of five basic types of media, namely text, video, sound, graphics and animation, into the learning environment which provides a powerful tool for education.

Types of multimedia projectors

• Currently two types of multimedia projectors are available in the market. They are
• LCD (Liquid Crystal Display) projectors
• DLP (Digital Light Processing) projectors

Principle of LCD and DLP projectors

• LCD projector: The rays of light coming from the projection lamp pass through the prism, the prism splits the light into its component colors and these are sent through small LCD screens. The light is then beamed through a lens onto a screen where the images can be seen by the human eye.
• DLP projector: The rays of light coming from the projection lamp are shined through a spinning color wheel onto a chip that is mounted with hundreds of thousands of tiny mirrors. The mirrors are turned off or on by electronic impulses according to the need for the color at that moment. Even though only one color is shown at a time, one color follows another so quickly that the primary colors seem to blend into the appropriate color. The image appears to be constantly lit, when in fact small parts of it are constantly flickering.

Materials required

1. Multimedia (LCD or DLP) projector
2. Screen
3. Personal computer or video device (DVD player)