DLP or LCD? DLP Projectors vs LCD Projectors

 
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One of the questions we are asked quite regularly is: which technology is better, DLP or LCD? The answer isn't a case of one or the other.

Both technologies have advantages and disadvantages and both are generally fine for common applications such as teaching, training or business presentations.
There are some differences however and knowing them could help you make a decision when choosing a suitable projector.

We will explain here how DLP projectors and LCD projectors work as well as their advantages and downsides.

 

DLP Projectors DLP Projectors

DLP or LCD? What is DLP Technology?

The DLP® chip was invented by Dr. Larry Hornbeck of Texas Instruments in 1987.
It is probably the world's most sophisticated light switch. It contains a rectangular array of up to 2 million hinge-mounted microscopic mirrors; each of these micromirrors measures less than one-fifth the width of a human hair.

DLP Chip   Ant leg and DLP chip
DLP® Chip
 
Ant leg in front of DLP® chip

When a DLP® chip is coordinated with a digital video or graphic signal, a light source, and a projection lens, its mirrors can reflect a digital image onto a screen or other surface. The DLP® chip and the sophisticated electronics that surround it are what we call DLP® technology.

DLP or LCD? How does DLP work?

Point 1-chip DLP® projector system

1 chip DLP system
1-chip DLP® projection system

Televisions, home theater systems and business projectors using DLP® technology rely on a single chip configuration like the one above.

White light passes through a colour filter, causing red, green, blue and even additional primary colours such as yellow cyan, magenta and more to be shone in sequence on the surface of the DLP® chip. The switching of the mirrors, and the proportion of time they are 'on' or 'off' is coordinated according to the colour shining on them. Then the sequential colours blend to create a full-colour image you see on the screen.

Point 3-chip DLP® projector system

3 chip DLP system
1-chip DLP® projection system

DLP® technology-enabled projectors for vey high image quality or very high brightness applications such as cinema and large venue displays rely on a 3-chip configuration to produce stunning images, whether moving or still.

In a 3-chip system, the white light generated by the lamp passes through a prism that divides it into red, green and blue. Each DLP® chip is dedicated to one of these three colours; the coloured light that the micromirrors reflect is then combined and passed through the projection lens to form an image.

To see a demo of how DLP® works please click here

Advantages and Disadvantages of DLP Advantages and Disadvantages of DLP

Point Advantages

  • Because the "pixels" (mirrors) are so close together, there is less of a "chicken wire" effect.
    The "chicken wire" is a phenomenon by which the grid-like structure of the panel on LCD projectors is visible on the projected image. On DLP projector this effect is greatly reduced making the image appear softer and smoother. This is more noticeable in video applications.
  • DLP projectors achieve higher contrast ratios.
  • DLP projectors tend to be quieter
  • DLP projectors tend to be smaller and lighter than their LCD counterparts because the system only requires one panel instead of three.
  • Because they have sealed optics, DLP projectors are ideal for dusty or smoky environments such as clubs.

Point Disadvantages

  • A few DLP projectors users can suffer from the "rainbow effect" described as brief flashes of rainbow like "shadows" most often seen on high contrast areas of moving bright/white objects on a mostly dark/black background such as the credits at the end of a movie.
    The technology has improved greatly over the years reducing the amount of people who notice this effect.
  • Althought this is barely noticeable on the latest models, DLP projectors aren't as good as LCD models at rendering colours. This can be important for photography clubs or where the corporate colours need to be spot on.

LCD Projectors LCD Projectors

DLP or LCD? What is LCD Technology?

Liquid Crystal Display (LCD) projectors pass light through LCD panels about the size of a postage stamp; the LCD panel is made up of miniscule panels ('pixels') that can be clear, opaque or some semi-clear point in between. These pixels take the form of the image to be created, and the light passes through the clear or partly-clear areas in the same way that light passes through the clear or gray parts of a negative.

LCD panels
LCD Panels

The projector's lens, in turn, expands the image and directs the light onto the screen or viewing surface. This enlarges all the tiny details and creates clear, detailed and beautiful images with ultra-smooth movement.

DLP or LCD? How does LCD work?

A light source (lamp) projects white light onto a combination of dichroic mirrors that split the light into its three basic video colours: red, blue and green.
Each of the three colors of light is then passed through its own LCD panel. Each LCD chip takes the electrical signal it receives and creates an image.
The three colour images are then combined using a prism to form a full-color image consisting of millions of colors which passes through a lens and is projected onto a screen.

LCD system
LCD System

To see a demo of how LCD works please click here

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Advantages and Disadvantages of LCD Advantages and Disadvantages of LCD

Point Advantages

  • LCD gives a sharp image which is preferable in high detail data applications.
  • LCD has more colour saturation which increases the perceived overall brightness.
  • LCD projectors are more "light efficient" than DLP projectors meaning given the same wattage lamp, the LCD projector will produce a brighter image.

Point Disadvantages

  • Older models suffer from the "chicken wire" effect, although newer model have improved and it is less visible on higher resolutions such as XGA and higher.
  • LCD projectors don't achieve as high a contrast ratio as DLP projectors and black and dark colours tend not to be as dark.
  • LCD panels being organic, they degrade over time. The less the machine is used each day, the less of a problem this is. Projectors that are used for over eight hours a day however will have a shorter life span.

Conclusion Conclusion: which is best, DLP or LCD?

As mentioned earlier there is no straight answer to this question. It basically depends on your requirements.

Generally we would advise that if colour reproduction is critical to your application or you need the image to be sharp you should choose an LCD projector.
If you are using the projector for video or home cinema or require portability, DLP would be a better choice.

Both technologies are improving all the time and both would be suitable for the majority of applications so when choosing a projector, consider all the other main factors first and only use the technology as a secondary factor in your choice.

If you would like the opinion of one our experienced advisers, please call us on 01924 278464 and they will be happy to recommend suitable models for your application.

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Sources: dlp.com, 3lcd.com

   
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