The first part: The basic principle of teaching projector.
The principle of teaching projector is to enlarge the image through high-intensity projection lamp and project it onto the screen through the lens to form a high-definition picture. After it is connected with computer, DVD and other equipment, its input signal is converted into video signal, which is imaged on the screen through the reflection of lamp light.
The second part: How to choose teaching projector?
Clear use environment: Before choosing a projector, you should first make clear what environment it will be used in, such as indoor or outdoor, clean or dusty.
Resolution: The higher the resolution, the better the projection quality, and students can see images and information more clearly. So you should choose a projector with higher resolution.
Brightness: Brightness refers to the intensity of light emitted by projection lamp. Generally speaking, the higher the brightness, the clearer the projected picture. When choosing a projector, it should be based on the size of the classroom, lighting conditions and other factors.
Sound effect: If you need to use this projector to play video tutorials or speeches, it is very important to choose a projector with good sound effect.
Part III: Matters needing attention in the use of teaching projectors.
Formulate rules of use: Before using the projector, formulate corresponding rules of use, so that every user can know the usage method, sequence and precautions.
Regular maintenance: The teaching projector also needs regular maintenance to ensure its service life and working effect. For example, replace the filter screen and light bulb regularly.
Location: The projector should be placed in a cool and dry place, away from direct sunlight and humidity.
4. Unplug the power cord after shutdown: After use, turn off the projector completely, and then unplug the power cord to ensure a stable power supply.
Teaching projector is an indispensable tool in modern classroom education, which can greatly improve students' learning interest and effect. As long as we pay attention to the precautions in purchase and use, it will become a strong support for education and teaching.
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