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Every projector basically has a range of distance where a clear image is possible. The throw ratio will help us in understanding how far the projector has to be placed away from the screen or wall in order to produce a clear image.
There are three types of projector classified on the basis of throw distance
Ultra short throw
Ultra short throw projectors are elite projectors. They can be placed a few inches to few feet away from the wall or screen and can create 60 inches to a 150-inch screen projection with clarity.
Ultra–short–throw projectors have a throw ratio of less than 0.4.
- Laser projector
Short throw projectors are the most common type of projectors in regular use they can be placed around 5 feet to 20 feet far from the screen or wall to get a clear image of 30″ to 300″.
- Home theatre projector
- Pico/ pocket/mini/portable projector
Long-throw projectors are basically used for conference halls, office presentation etc.there throw distance range is large around 8 feet to 30 feet for 30″ to 300″ screen
Example – Business Projectors
The aspect ratio is basically a ratio of the vertical height of the screen to the horizontal width of the screen. There are many variations in aspect ratios but for our context, we mostly use two-aspect ratios
- 16:9 (this is best for watching movies)
- 4:3 (best for presentations)
Resolution is basically used to explain the clarity of the image. If you have a high resolution you have more pixels to show minute details with clarity.
- SVGA (800 x 600) pixels = 4,80,000 pixels
- XGA (1024 x 768) pixels = 7,86,432 pixels
- WXGA (1280 x 800) pixels = 9,60,000 pixels
- HD (1920 x 1080) pixels = 20,73,600 pixels
- WUXGA (1920 x 1200) pixels = 23,04,000 pixels
- 4K (4096 x 1080) pixels = 44,23,680 pixels
Brightness is the intensity of light observed on a screen. because of which projection is visible on the screen or wall.
Its sufficient value is must because without brightness other factors like contrast and display type won’t be effective
- for Dark Room 100 ANSI to 700 ANSI
- room with some ambient 700 ANSI to 1500 ANSI
- For open space more than 1500 ANSI
It is the measure of how black is black as compared to white or in other words, the difference between darkest pixel to lightest pixel.
So a projector with a 15000:1 contrast ratio means that the white pixel is 15000 times brighter than the black pixel.
The higher the contrast ratio, the more detail you can see on the projected image whether its numbers, pictures, graphs, text, or video. Contrast is what makes it possible for us to see the shades of colours. So good contrast is all about seeing the details.
DLP stands for Digital Light Processing. The DLP projector produces the picture by reflected light from a chip that has millions of tiny mirrors fixed on it. This chip is commonly known as a ‘Digital Micromirror Device’ or DMD.
As the DLP chip rotates and the mirrors start reflecting the light on the screen and create an image
there are two types of DLP projector
single Chip DLP projector
- Single chip DLP projector uses only one chip and processes the RGB light with the help of high speed rotating wheel.
- These is most of the projector sold today
- good for business,education and home use
- Good performance for price
- Typically Smaller
3 chip DLP projectors
- 3 chip DLP projectors can process individual beams of RGB light simultaneously and are capable of producing high quality images which are bright. Most cinema theaters use 3 chip DLP projectors to show movies.
- These are High end Cinema projector which include commercial application In Cinema Theater
- High light output
- High price
In a 3LCD projector, white light is first split into red, green and blue beams. Each beam is then filtered through its own individual LCD, which gives images the exact brightness for each colour. The colour beams are then recombined in a prism before being projected as a complete image
- highly Competitive with DLP
- Great performance for the price
- Better placement flexibility
- Winning combination of performance and features
- In Business, education or Home entertainment
- specifically business and in education world 3LCD projectors are Dominating
LCoS stands for Liquid Crystal Technology on Silicon. It is a hybrid between DLP and LCD. LCoS projectors combine the reflective technology of DLP but blocks light using crystals, similar to LCD. This results in an ability to produce whiter whites and deeper blacks.