What is a projector?
A projector is an output device that can project images or video onto a large surface, such as a white screen or wall. It can display not only image but also video through different interfaces. A projector can be connected to a smart phone, computer, VCD, DVD player, game console, etc. to play the corresponding video signals.
Like TVs, video projectors exploit different display technologies. Today, 3 major technologies are mainly used by manufacturers, namely the DLP, the LCD and the Laser.
DLP technology, fully named digital light processing, was invented by Texas Instruments. A DLP projector consists of a matrix with micro mirrors (DLP chip), which associated with a light source and a lens to reflect an image.
Three-LCD (often styled "3LCD") is the most common imaging system used in multimedia projectors. It uses a liquid crystal to produce a visible image. Liquid crystal displays are super-thin technology display screen that are generally used in laptop computer screen, TVs, cell phones and portable video games.
A laser projector is a device that projects changing laser beams on a screen to create a moving image for entertainment or professional use. Laser technology raises the brightness to high levels, while maintaining a very high contrast. It is more ecological, offering a life of up to 20,000 hours in operation.
Important specs and features of a projector include the followings:
Expressed in lumens (lm), the brightness is also decisive in the choice of your video projector. The higher the lumen value, the higher the potential brightness of the image. If the brightness is insufficient, the projected image will be of poor quality both in terms of readability and color rendering.
- Contrast ratio
A good contrast ratio is also needed to display beautiful images, and ensure a satisfactory image depth. The higher the contrast, the better.
Resolution is the number of dots or pixels used to display an image. Good resolution is essential to image clarity, especially for home theater
- Throw ratio
Projectors have a very important specification called "throw ratio." Throw ratio is a specification that is determined by the distance between the projector and the screen (namely throw distance), as well as the width of the screen.
For different use, there are different types of projectors.
- Home Theater Projector
- Business Projector
- Portable Projector
- Multimedia Projectors
- Large Venue Projector
- Exhibition & Simulation Projector
- Classroom Projector