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LED projector basic principle:
LED (Light Emitting Diode), also known as light-emitting diodes, has long been used in display and lighting applications. This kind of light bulb has the characteristics of high efficiency and long life, so it is used on the projector, the life of the projector can reach more than 20,000 hours, the LED light emitting principle is different from the traditional UHE, UHP light bulb, it does not produce a lot of heat in the light emitting process With the increasing popularity of projection equipment, in the daily life, the market share of new projectors for LED projectors is increasing.
Because of its technical characteristics, the LED is mainly used in miniature projectors due to its low power consumption and heat generation, but also because it uses LED light sources to shrink the projector into a miniature projector that we can see.
The LED projector resolution is expressed by multiplying the number of horizontal pixels in the picture by the number of vertical pixels. The resolution of the LED projector does not refer to the resolution of the signal that the LED projector can receive, but refers to the physical resolution of their core light engine (LED chip, LCD panel, LCOS panel, etc.). Although the projector can usually receive signals of multiple resolutions, significant loss of picture detail occurs when the signal resolution is higher than the physical resolution of the projector. Common resolutions and representations are as follows:
SVGA: Common Resolution for 800x600 Economy Projector
XGA: 1024x768 resolution for mainstream business and educational projectors
SXGA+: 1400x1050 resolution for high-end projectors for high-end professional applications such as imaging
480p: 852x480 resolution for low-end home projectors
720p: Resolution used by 1280x720 or 1280x768 mid-range home projectors
1080p: 1920x1080 or 1920x1200 resolution for high-end home projectors
LED projector performance
Short-focus short-focus projection, as the name implies, is a short focal length LED projector. What are the benefits of short-focus projection? The biggest advantage of a short-focus LED projector is that it requires a shorter throw distance to achieve the same size of the screen. This type of LED projector does not need a large space scene in the projection screen, so it is widely welcomed by users of small and medium enterprises, education markets, etc. For home users, short-focus LED projector is also important, especially some of the living room comparison Small home users. Due to the use of a wide-angle or fish-eye lens, short-focus LED projectors often have a lens manufacturing process and cost that are higher than those of ordinary lenses. The high cost factor is not conducive to the popularization of short-focus projectors.
brightness
The LED projector brightness refers to the light output of the LED projector and is expressed in terms of luminous flux (the energy that the light source radiates out of the surrounding space per unit time to generate a sense of the human eye). The unit is lumens. For projectors, the higher the number of lumens, the stronger the brightness. However, since the bulb of the LED projector is relatively expensive and the power is limited, blindly increasing the power will cause problems for the heat dissipation of the LED projector. Therefore, it takes a high price for the LED projector to increase the brightness.
Evenness
This is related to the concept of brightness. The ratio of the middle brightness to the surrounding brightness of the shot is generally defined as 100% in the middle. The brightness of the image projected by the LED projector on the screen is not completely uniform. In some areas, the brightness is higher, and in some places, the brightness is lower. Of course, the more uniform the brightness distribution of the projector is, the better.
Contrast
The ratio of black to white in the projected image of the LED projector is the gradient from black to white. The larger the ratio, the more gradient levels from black to white, and the richer the color performance.
The projected screen size refers to the diagonal size of the screen being projected. To deliver the required size, the LED projector needs to be installed at a corresponding distance from the projection screen.
Projection distance
Refers to the horizontal distance between the LED projector lens and the screen.
Horizontal scanning frequency (line frequency)
Also called line frequency, the LED projector has a range of horizontal scanning frequencies. If the horizontal scanning frequency of an input signal from an image source such as a computer is out of this range, the LED projector will not be able to deliver, and usually "NO SIGNAL" is displayed. If your computer has a high display configuration, it is recommended that you do not purchase low-end projectors with a poor horizontal scanning frequency. Otherwise, you will not be able to project the desired image effects or even use them.
Vertical scanning frequency (refresh rate)
Also called frame rate or display image refresh rate. The projector will not be able to deliver if the vertical scanning frequency of the input signal from the computer exceeds this range. Within the range, when the vertical scanning frequency of the computer is set to a high value, the projection effect is good.
LED projector video input and output interfaces
The video input interface of the LED projector refers to the interface connecting the computer display signal, so that the computer video signal is transmitted to the LED projector through the input interface and then the computer image is launched. Some LED projectors also have a video output interface through which the display, LCD TV, and other display devices can be connected. If the projector does not have this interface, you can use a VGA splitter to connect the monitor.
LED projector HDMI high-definition interface
HDMI can not only meet the 1080P resolution, but also support digital audio formats such as DVD Audio, support for eight-channel 96kHz or stereo 192kHz digital audio transmission. HDMI devices feature "plug-and-play" and automatically negotiate between signal sources and display devices to automatically select the most appropriate video/audio format.
LED projector product advantages
First: long service life, energy saving and environmental protection. The LED light source decays slowly, attenuates only 5% for 10,000 hours, and the lifespan can reach 50,000 hours under scientific and reasonable use conditions. The power of the whole machine does not exceed 38 watts, which is quite energy-efficient. Within a year, electricity savings of 400-500 yuan can be achieved. The power of the whole machine does not exceed 38 watts, which is quite energy-efficient. Within a year, it can save about 400-500 yuan in electricity. Traditional projectors are generally more than 200W, or even higher. LED is called a cold light source, the light does not contain infrared rays and ultraviolet rays, the screen does not flicker, moisten eyes. And the general projection lamp is a gas discharge lamp, which contains harmful environment and human body mercury, while the LED light source does not contain mercury. And it has the feature of turning on and off, turning off and turning off the general electric appliance, eliminating the annoying boot and shutdown waiting time of ordinary projectors.
Second: Due to the longevity, low calorific power, and high reliability of LED projectors, the maintenance costs and after-sales costs of the entire projector are much lower than those of conventional projectors. It eliminates the need for frequent regular maintenance of conventional projectors, high repair parts fees, and more.
Third: compact, portable, feature-rich, with a strong digital device connectivity and interoperability; can be connected to computers, mobile phones, PDA, and other portable digital devices; can also be inserted SD card, U disk, mobile hard disk and other mobile storage devices; support Most of the multimedia files on the market (including RMVB files) are played directly and smoothly. They are super portable multimedia players and projection devices.
Fourth: work and life are correct: At work, we are our working assistants, doing business briefings and mini-conferences anytime and anywhere; leaving home with my pockets for work, whether it is picking up the TV set on the set-top box or watching DVDs, Or connect the PSP, Wii, X-BOX to play the game, these are no problem.
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