DLP Projectors: Differences From LCP And LED. The Principle Of Operation Of Mini-projectors. Why Do You Need Active 3D Glasses? Technology Features

2024 Author: Beatrice Philips | [email protected]. Last modified: 2024-01-18 12:09

Despite the fact that the range of modern TVs is amazing, projection technology does not lose its popularity. On the contrary, more and more people choose just such equipment for organizing a home theater. Two technologies are fighting for the palm - DLP and LCD . Each has its own advantages and disadvantages. This article will explain in detail the features of DLP projectors.

Peculiarities

A multimedia format video projector is designed to project an image onto a screen. The principle of operation of such devices is similar to the operation of conventional film projectors . The video signal, illuminated by powerful beams, is directed to a special module. An image appears there. This can be compared to the frames of a film strip. Passing through the lens, the signal is projected onto the wall. For the convenience of viewing and clarity of the picture, a special screen is fixed on it.

The advantage of such systems is the ability to obtain video images of different sizes . The specific parameters depend on the characteristics of the device. And also the advantages include the compactness of the devices. They can be taken with you to work for demonstration of presentations, on country trips to watch films. At home, this technique can also create an impressive environment, comparable to being in a real movie theater.

Some models have 3D support. By purchasing active or passive (depending on the model) 3D glasses, you can enjoy the effect of complete immersion in what is happening on the screen.

Principle of operation

DLP projectors contain in the structure special matrices … It is they who create the picture thanks to the many mirror trace elements … For comparison, it should be noted that the principle of LCD operation is to form an image by the influence of light fluxes on liquid crystals that change their properties.

Matrix mirrors of DLP models do not exceed 15 microns . Each of them can be compared with a pixel, from the aggregate of which a picture is formed. Reflective elements are movable. Under the influence of an electric field, they change position. At first, the light is reflected, falling directly into the lens. It turns out a white pixel. After a change of position, the luminous flux is absorbed due to a decrease in the reflection coefficient. A black pixel is formed. Since the mirrors are constantly moving, alternately reflecting light, the necessary images are created on the screen.

The matrices themselves can also be called miniature. For example, in models with a Full HD image, they are 4x6 cm in size.

Concerning light sources, both laser and LED are used . Both options have a narrow emission spectrum. This allows you to obtain pure hues with good saturation, which do not require special filtering from the white spectrum. Laser models are distinguished by high power and price indicators.

LED options are cheaper. These are usually small products based on single-array DLP technology.

If the manufacturer includes colored LEDs in the structure, there is no need to use color wheels. The LEDs respond instantly to the signal.

Differences from other technologies

Let's compare DLP and LSD technologies. So, the first option has undeniable advantages.

1. Since the principle of reflection is used here, the luminous flux has a high power and fullness. Due to this, the resulting picture is smooth and flawlessly pure in shades.
2. A higher video signal transmission rate provides the smoothest possible frame change, eliminates image "jitter".
3. Such devices are lightweight. The absence of numerous filters reduces the likelihood of breakdowns. Instrument maintenance is minimal. All this provides cost savings.
4. The devices are durable and are considered a good investment.

There are few disadvantages, but it would be fair to note them:

• a projector of this type requires good lighting in the room;
• Due to the long projection length, the image may appear slightly in-depth on the screen;
• some cheap models can give a rainbow effect, since the rotation of the filters can lead to distortion of the shades;
• due to the same rotation, the appliance may make a little noise during operation.

Now let's take a look at the pros of LSD projectors

1. There are three primary colors here. This ensures maximum picture saturation.
2. The filters don't move here. Therefore, the devices operate almost silently.
3. This type of technique is very economical. Appliances consume very little energy.
4. The appearance of the rainbow effect is excluded here.

As for the cons, they are also available

1. The filter of this type of device must be cleaned regularly and sometimes replaced with a new one.
2. The screen image is less smooth. If you look closely, you can see pixels.
3. The devices are more massive and heavier than DLP options.
4. Some models produce images with low contrast. This can make blacks appear grayish on the screen.
5. During long-term operation, the matrix burns out. This causes the image to turn yellow.

Varieties

DLP projectors are classified into one- and three-matrix . There is a significant difference between them.

Single matrix

Devices with only one die work by rotating the disc … The latter serves as a light filter. Its location is between the matrix and the lamp. The element is divided into 3 identical sectors. They are blue, red and green. The luminous flux is passed through the colored sector, directed to the matrix, and then reflected from miniature mirrors. Then it goes through the lens. Thus, a certain color becomes visible on the screen.

After that, the luminous flux breaks through another sector. All this is happening at a high speed. Therefore, a person does not have time to notice the change in shades.

He sees only a harmonious picture on the screen. The projector creates about 2000 frames of the main colors. This produces a 24-bit image.

The advantages of models with one matrix include high contrast and depth of black tones . However, it is precisely such devices that can give a rainbow effect. You can reduce the likelihood of this phenomenon by reducing the frequency of color change. Some firms achieve this by increasing the speed of rotation of the filter. Nevertheless, manufacturers cannot completely eliminate this drawback.

Three-matrix

Three-die designs are more expensive. Here, each element is responsible for the projection of one shade . The image is formed from three colors at the same time, and a special prism system guarantees accurate alignment of all light fluxes. Due to this, the picture is perfect. Such models never create a shimmery or iridescent effect. Typically these are high-end projectors or options designed for large screens.

Brands

Today many manufacturers offer DLP technology. Let's review several popular models.

ViewSonic PX747-4K

This home mini projector provides image quality 4K Ultra HD . Flawless clarity and realism with ultra-high resolution and state-of-the-art chips DMD from Texas Instrument . Saturation is guaranteed by the high-speed RGBRGB color wheel. The brightness of the model is 3500 lumens.

Caiwei S6W

This is a 1600 lumen device. There is support for Full HD and other formats, including outdated ones . The colors are vivid, the image is evenly colored, with no darkening around the edges. The battery power is enough for more than 2 hours of continuous operation.

4 Smartldea M6 plus

Not a bad budget option with 200 lumens brightness. Image resolution - 854x480. The projector can be used in both dark and daylight … In this case, you can project the image onto any surface, including the ceiling. Some people use the device to play board games.

The speaker is not very loud, but the fan runs almost silently.

Byintek P8S / P8I

Excellent portable model with three LEDs. Despite the compactness of the device, it forms a high-quality image . There are a variety of options that are useful for making presentations. There is a version with Bluetooth and Wi-Fi support. The model can work for at least 2 hours without recharging. The noise level is low.

InFocus IN114xa

A laconic version with a resolution of 1024x768 and a luminous flux of 3800 lumens . There is a built-in 3W speaker for rich and clear sound. There is support for 3D technology. The device can be used for broadcasting presentations and for film viewing, including at outdoor events.

Smart 4K

This is a high resolution Full HD and 4K model . Possible wireless sync with Apple devices, Android x2, speakers, headphones, keyboard and mouse . There is support for Wi-Fi and Bluetooth. The user will be pleased with the silent operation of the equipment, as well as the ability to project an image onto a screen up to 5 meters wide. There is support for office programs, which makes the device universal. Moreover, its size barely exceeds the dimensions of a mobile phone. A truly amazing gadget, indispensable when traveling, at home and in the office.

How to choose?

There are several key characteristics to consider when choosing the right projector

• Type of lamps . Experts advise giving preference to LED options, although some products with such lamps in the design make a little noise. Laser models sometimes flicker. They are also more expensive.
• Permission . Decide in advance what screen size you would like to watch movies on. The larger the image, the higher the resolution the projector should have. For a small room, 720 may be enough. If you want impeccable quality, consider the options Full HD and 4K.
• Brightness . This parameter is conventionally defined in lumens. An illuminated room requires a luminous flux of at least 3,000 lm. If you watch a video while dimming, you can get by with an indicator of 600 lumens.
• Screen . The screen size should match that of the projection device. It can be stationary or roll-to-roll. The type of installation is selected based on personal taste.
• Options . Pay attention to the presence of HDMI, Wi-Fi support, power saving mode, automatic distortion correction and other nuances that are important to you.
• Speaker volume … If a separate sound system is not provided, this indicator can be very important.
• Noise level … If the manufacturer claims that the projector is virtually silent, that can be considered a big plus.

Operating tips

In order for the projector to work for a long time and properly, it is worth adhering to certain rules when using it

1. Place the appliance on a flat and solid surface.
2. Do not use it in high humidity and freezing temperatures.
3. Keep the device away from batteries, convectors, fireplaces.
4. Do not place it in direct sunlight.
5. Do not allow debris to enter the ventilation opening of the instrument.
6. Clean the device regularly with a soft, damp cloth, remembering to first unplug it. If you have a filter, clean it too.
7. If the projector accidentally gets wet, wait until it dries completely before turning it on.
8. Do not unplug the power cord immediately after watching. Wait for the fan to stop
9. Do not look into the projector lens as this will damage your eyes.

DLP projector Acer X122 is presented in the video below.