How to choose a home projector?

Smart projectors and non-smart projectors:

The smart projector is simply an Android computer plus a portable projector with Android, Android box and projector capabilities. Added Internet access and equipped with Android smart operating system, has a separate UI interface, supports multi-screen interaction, can share with Android mobile phones, Android PAD, iPhone, iPad, etc.; multiple USB interfaces, supports USB keyboard and mouse, etc.; with small size, easy Features such as operation, multi-function, multi-support, and portable tape, no need to connect to a computer or player, just plug in the Internet cable or connect to WIFI to watch TV movies.

Smart projector is one of many intelligent electronic products in recent years. It is a software and hardware with functions such as extensible, human-computer interaction, and multimedia interconnection. It can realize network search, network video, video on demand, digital music, and network education resources. , network video and other application services. Smart projectors are becoming the third type of information access terminal after computers and mobile phones. Users can access the information they need at any time. Smart projectors will also become smart devices that enable cross-platform search among projectors, networks, and programs. The smart projector will be an "entertainment center", where users can search for various network resources, conduct remote conferences, be able to launch satellites, and network videos.

Smart projection for wireless Internet access, web browsing, online video playback, online video dialogue, office file use, play games, offline presentations, office software direct reading capabilities, 2D to 3D capabilities, TV capabilities, cloud technology, and other additional features. Not just as an entertainment application, it can be used as a weapon for mobile business conference presentations.

The non-intelligent projector only provides the function of projection, and a device that must output an image is connected to the projector, and its applicability and human-computer interaction are greatly reduced. Intelligence is the development direction of any electronic product, and projection cannot be excluded. Moreover, only intelligent projection can eventually be integrated into future business and home entertainment networks.

DLP Technology and LCD Technology

LCD (Liquid Crystal Display) LCD projector, its principle is the use of liquid crystal photoelectric effect, that is, the arrangement of liquid crystal molecules under the influence of the electric field changes, affect the liquid crystal cell transmittance or reflectivity, thus affecting its optical properties , produce images with different gray levels and colors. LCD projections are colorful and rich. The disadvantage is that the black level performance is poor, the contrast is not high, looks gray, and the grid feels obvious.

The Digital Light Processor (DLP) projector uses a digital micro-mirror device (DMD) as an imaging device. The monolithic DMD is composed of many micromirrors. Each micromirror corresponds to one pixel. The physical resolution of the DLP projector is determined by the number of micromirrors. The DLP projector technology is an all-digital reflective projection technology. Its characteristics are first of all digital advantages. With the adoption of digital technology, the gray scale of the image is improved, the image noise disappears, the picture quality is stable, and the digital image is very accurate. Followed by the reflection advantage. The application of reflective DMD devices greatly increases the total light efficiency of the imaging device, and the contrast and brightness uniformity are excellent. The DLP projector has high definition, uniform screen, sharp colors, and disappearance of buzz. The disadvantage is that the color performance is not as rich as the LCD.

LED lights and high-pressure mercury bulbs

LED (Light Emitting Diode), also known as light-emitting diodes, this technology has long been applied in the field of display and lighting. The main body of the LED is an electroluminescent semiconductor material. The stronger the current is, the stronger the light emission is. The principle of LED light emission is different from that of conventional UHE and UHP light bulbs. It does not generate a lot of heat during the light emission process, so the lifetime can reach over 20,000 hours. Compared with traditional projectors, it is about ten times. If used for 5 hours a day, it can be used for 10 years. We all know that LED light sources are known for their “energy saving and environmental protection”. If a large number of LED light sources are used in the field of projectors and lighting, the annual contribution to the environment is inestimable. Advantages: non-toxic and harmless, no radiation; cold light source, low heat; low power consumption, low light decay, long life, hard to damage, eliminating the maintenance costs of the later consumables. Disadvantages: In terms of projection, the current brightness is lower than traditional light bulbs.

Metal halide bulbs have the advantage of being cheap, but have the disadvantage of having a short half-life. Generally, the brightness of a halogen lamp will decrease to about half of its original value after 1000 hours of use. And high heat, high requirements for the projector cooling system, should not be done for a long time (4 hours) projection. The metal halide lamp generates warm light, requires higher power to produce the same illuminance as the UHP lamp, has a large power consumption, a short service life, a long start-up time, and is gradually extinguished when the lamp is broken.

High-pressure mercury lamp light source (UHP, UMPRD, UHE, SHP, etc.) has the advantage of relatively high brightness, the disadvantage is short life, about 2000-4000 hours, power consumption is relatively large compared to LED lights, heat is also large; The cost of the later period is higher.

Resolution

Without high-definition resolution (1280720P and above), there is no basis for the basic quality conditions. At present, the mainstream of home projectors is 720P and 1080P. This resolution often refers to the physical resolution of the display device in the projector. Represents the sharpness of the image. The sharpness that the user eventually sees is actually a combination of physical resolution and optical resolution.

The resolution of the home projector mainly includes the following three kinds, entry products SVGA (800×600), 720p (1280×720), 1080p (1920×1080). In addition, business projectors with WXGA (1280×800) widescreen resolution can also be used for home entertainment. Currently DLP technology, LED light source projector is 1280 × 800 (720P), the United States TI has recently released a 1080P chip, DLP LED 1080P intelligent projector will appear in the market in the near future, the price is not expected to be very cheap.

Nominal brightness (lumens)

Luminance is the main technical indicator of the projector. Luminance is usually represented by luminous flux. Luminous flux is the ability to describe the visual response of the light source radiation per unit of time. The unit is lumens. Most of the brightness of the projector has reached more than 2000 ANSI lumens. In general, in the 20-40 square meters video theater, the projector brightness is recommended to choose between 1200-2000ANSI lumens.

In fact, the common mid-range Japanese and Taiwanese home-fired projectors generally have a brightness of 500-2000 ANSI lumens. It can be seen that home projectors do not need too much brightness. The reason is: In a dark environment with good light shielding, 200 ANSI lumens or more, that is, to achieve acceptable image brightness effects, 600 ANSI lumens can achieve quite good results. In a poorly shading environment, even if it is a 20,000-lm movie machine, the effect is greatly reduced. Visible shading is the key, not the brightness (unless not even 200 lumens).

Nominal contrast

It is the ratio of black and white on the screen. The effect of contrast on visual effects is critical. In general, the greater the contrast, the clearer and more eye-catching the image, the brighter the colors, and the less contrast, the more gray the entire screen will be. The nominal contrast ratio of most current LCD projectors is around 400:1 (ANSI), and the nominal contrast of most DLP projectors is above 1500:1 (full white/all black). The higher the contrast, the higher the projector price.

Choose white or gray curtain

The LCD projector's black performance is not gray, perfect chip constantly updated, the contrast is getting higher and higher, you can choose a white screen. If the brightness is high, the contrast is not very high. The performance of the black is not very strong and is the LCD, it is recommended that the gray screen can compensate for the shortcomings of the lack of contrast black not black. If it is a DLP projector, generally do not specifically say the environment and other factors can be selected white curtain, in order to improve the vividness of the color, if the light is not very dark and the living room, you can also choose the gray screen. The benefits of the gray screen, in addition to making the black darker, increase the contrast and resist the reflected light from the environment.

The electric screen is the most common of all kinds of products. The advantage is that the flatness is slightly better and the maintenance is easier. The screen is evenly decentralized from the two ends of the motor to ensure that the curtain is not affected by external forces. It is easy to lift, easy to hide and install. Features, can maintain the flatness of the curtain for a long time, and it will not produce ripples in long-term use. Usually this type of screen is more expensive, but people are still happy to use this type, after all, value for money. Practical for the living room (wall mounted TV and special walls (walls with windows or special structures).

In general, home projectors choose 16:9 curtains, the screen size is 80 inches to 120 inches as the mainstream, the maximum should not exceed 150 inches. Can refer to the following:

1000 lumens maximum 100 inches 16:9 (2.25x1.25 meters)

1000-1300 lumens maximum 120 inches 16:9 (2.7x1.5 meters)

1300-1600 lumens maximum 133 inches 16:9 (2.99x1.66 meters)

1600-2000 lumens maximum 150 inches 16:9 (3.37x1.87 meters)

2000-2500 lumens up to 200 inches 16:9 (4.5x2.5 meters)

According to the viewing distance, choose the right curtain size. If it is too big, it will dizzy, too small and lack of shock. The recommendations are as follows:

The viewing distance is about 3 meters. The recommended size is 90-100 inches.

View distance of about 3.5 meters recommended size 100-120 inches

View distance 4 meters recommended size 120-130 inches

Viewing distance of about 5.5 meters recommended size 130-150 inches

In 2015, for the home projector market, it is undoubtedly a positive PK with the TV. The coexistence of the two is a future trend. After all, the big picture projected by the projector cannot be achieved by the television. Even if there are 100 The price of the television, the expensive price, and the transportation and transportation are all problems. For people who love to watch movies and big screens, home smart projectors are undoubtedly the best choice!