Difference Between LCD and DLP

Key Difference: An LCD uses liquid crystals that are sandwiched between two sheets of polarizing material. DLP technology uses a digital micromirror device which comprises around 2 million hinge-mounted microscopic mirrors. DLP’s are thicker compared to LCDs and cannot be hung up on a wall due to their width. DLP’s consume less power compared to LCDs and have a higher refresh rate as well.

LCD (Liquid Crystal Display) and DLP (Digital Light Processing) are type of projection techniques that are used in projectors and televisions. Both these technologies have significant differences and are made of different technologies.

An LCD uses liquid crystals that are sandwiched between two sheets of polarizing material. The images are displayed when electrical charge is applied to the crystals. An LCD uses a select type of liquid crystal known as twisted nematics (TN), which are twisted in shape. Applying a current to these crystals causes them to unwind to a certain degree depending on the voltage. A LCD is in a layer formation, it starts with a mirror on the back for reflection, followed by a piece of glass that has a polarizing film on the bottom side, and a common electrode plane made of indium-tin oxide on top. After that is a layer of liquid crystals, followed by another piece of glass with an electrode and another polarizing film, which is at a right angle to the first one. The LCD is then hooked up to power source that provides a charge to the crystals and causes them to create an image on the screen. LCDs also have a backlight that makes the image visible to the user.

DLP technology was originally developed by Texas Instruments in 1987 and uses a digital micromirror device. This technology is most commonly used in digital cinema projection, and can also been see in TVs. The DLP chip comprises around 2 million hinge-mounted microscopic mirrors and is combined with a digital video or graphic signal, a light source, a projection lens, and a color filter. In order to create an image, the DLP chip mounted with the mirrors is either tilted towards the light source (ON) or away from it (OFF). The rapid tilting creates a light or dark pixel on the surface. The system can come with a single-chip or three-chips. The single-chip system also includes a color wheel placed between a while lamp and the DLP chip. The color wheel is divided into sectors with primary colors, and now they also come with secondary colors. The rotating color wheel, along with the chip is used to project the image.

A DLP system with three-chip eliminates the need for a color wheel, and also eliminates the problem of the “rainbow effect.” The rainbow effect is when a color streak is caused across the screen when a person looks away from the screen and then looks back swiftly. The three-chip DLP system splits the light from a lamp and routes the light to each primary color which is then routed to each of its individual chip, the colors are finally combined and then displayed through the lens. Three-chip projectors are most commonly used in movie theatres.

The major differences between both the systems are DLP’s are thicker compared to LCDs and cannot be hung up on a wall due to their width. DLP’s consume less power compared to LCDs and have a higher refresh rate as well. One-chip DLP’s are prone to the rainbow effect, while LCDs are prone to a screen door effect. LCD’s also have a better viewing angle compared to DLPs. DLPs are cheaper and have a longer life span compared to LCDs.

 

LCD

DLP

Thickness

Skinner compared to DLP

Thicker compared to LCD

Power consumption

Consumes more power compared to DLP

Consumes less power as mirrors do not need extra powering

Screen Refresh Rate

Less than LED

Higher than LCD

Screen glare

Glare is minimum

Glare is minimum

Running Temperature

Hotter compared to DLP

Cooler

Burn-in

No burn-in occurs; but burn-outs can occur

No burn-ins can occur

Dead pixels

Can occur

Are very rare

Viewing angle

Up to 165 degrees

Less than 40 degrees

Contrast Ratio

15000:1

2000:1 or higher

Life span

60,000 hours

80,000 hours

Black level

Gray to Dark Gray

Dark Gray to Gray

Weight

Lighter compared to DLP

Heavier compared to LCD

Uses

Computer monitors, laptop screens, TV screens and cell phone screens

Projectors, TV screens

Price

Expensive compared to DLP

Cheaper compared to LCD

Benefits

Panels weigh less than plasma; use less energy; light; thinner; emits less electromagnetic radiation; no bleeding or smearing

Smooth jitter-free images; Perfect geometry and excellent grayscale linearity achievable; no screen burn-in; Less "screen-door effect" than with LCD projectors; offers affordable 3D projection display; longer lifespan; wider color gamut

Limitations

Slower refresh rate; limited viewing angle; blacks are brighter; susceptible to burn-out and image persistence; dead or stuck pixels may appear; smearing or ghosting can appear; loss of contrast in higher temperatures; poor display in sunlight

Rainbow effect; thicker; replacement lamp/light bulbs are expensive; dithering noise; error-diffusion artifacts; lag in gaming response times; reduced viewing angle; may use more electricity

Image Courtesy: molybdenum-sputtering-target.com, dlp.com

Most Searched Non-Alcoholic Drinks Most Searched in Society and Culture
Top 10 Most Searched Differences Most Searched in Business and Finance
Final vs Finale
Hyundai Elantra vs Hyundai Verna
Fats vs Oils
ADD vs ADHD

Add new comment

Plain text

CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.