L.C.E.C. on 17 August 2007
Comparison of Different Types of Projection Televisions
CRT Projector
Advantages
- Not restricted to fixed pixel resolutions, able to display varying resolutions
- Achieves the best black level and contrast ratio
- Achieves the best color reproduction
Disadvantages
- Heavy and large, especially depth-wise
- If one CRT fails the other two have to be replaced as well to maintain color and brightness balance
- Susceptible to burn-in because CRT is phosphor-based
- Limited viewing angles
LCD Projector
Advantages
- Smaller than CRT projector because LCD chip is very small
- LCD chip can be easily repaired or replaced
- Is not susceptible to burn-in
- Better viewing angles than those of CRT projector
Disadvantages
- The Screen-door effect: Individual pixels may be visible on the large screen, giving the appearance that the viewer is looking through a screen door.
- Defective pixels
- Poor black level and contrast ratio
- Not as slim as DLP projection television
- Uses lamps for light, lamps may need to be replaced
- Fixed number of pixels, other resolutions need to be scaled to fit this
DLP Projector
Advantages
- Slimmest of all types of projection televisions
- Achieves the best black level and contrast ratio
- DMD chip can be easily repaired or replaced
- Is not susceptible to burn-in
- Better viewing angles than those of CRT projectors
- Image quality will not fade with time, unlike phosphor-based projectors
- Defective pixels are rare
- Does not experience the screen-door effect
Disadvantages
- Uses lamps for light, lamps may need to be replaced
- Fixed number of pixels, other resolutions need to be scaled to fit this
- The Rainbow Effect: This is an unwanted visual artifact that is described as flashes of colored light seen when the viewer looks across the display from one side to the other. This artifact is unique to single-chip DLP projectors.
Scource: http://en.wikipedia.org/wiki/Large-screen_television_technology
