Wood Hole Saw,Timber Hole Saw,Drill Carbide Hole Saw Bits,Carbon Steel Hole Saw Bit Danyang Yongshun Tools Co.,Ltd , https://www.china-drill-bit.com
LED projector resolution
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: 800x600 economy projector common resolution XGA: 1024x768 mainstream business and education projectors using resolution SXGA +: 1400x1050 high-end projectors for high-end professional applications such as image resolution 480p: 852x480 low-end home projector used Resolution 720p: 1280x720 or 1280x768 resolution for mid-range home projectors 1080p: 1920x1080 or 1920x1200 resolution for high-end home projectors
LED light source
As we all know, LED projector lamp is a relatively expensive consumable product, which has a certain service life, when the lamp is used for a long time, it will be aging, replacing the lamp is a problem that the projector user must take into account, which is also the projector TV has a big disadvantage.
Over the years, major projector manufacturers have continued to devote to the development of longer-lasting light bulbs. The advent of LED projection technology has opened up a new phase in the development of projectors. Compared with traditional projectors, LED projectors with LED light sources have the biggest advantage that they do not need to replace the light bulbs frequently. Their lamp life is between 10,000 and 20,000 hours or even longer, and users do not need to worry about the loss of the projector lamp.
LED (Light Emitting Diode), also known as light-emitting diodes, this technology has long been applied in the field of display and lighting. Its main body is an electroluminescent semiconducting material. A positive voltage is applied to both ends of the electroluminescent material. The current flows from the LED anode to the cathode. The semiconductor crystal emits light of different colors from ultraviolet to infrared. The stronger the current, the stronger the light emission. .
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 10,000 hours. Since the LED is a cold light source, a large amount of heat does not occur like a metal halide lamp at work, and the complex light path structure required by the original light source is reduced, so that the requirement for the projector cooling system can be reduced, and the volume can be reduced. The original is much smaller. From a small point of view, LED projectors are generally kept under 1 kg, and some are even only about 0.5 kg, so the weight is easy to carry and use. And the noise is much smaller.
LED projector performance short focal
Short-focus projection, as the name suggests, is a short focal length LED projector. What are the benefits of short-throw projection? The biggest benefit of short-focus LED projectors is that they require shorter throw distances to achieve the same size of picture. 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 Ratio The ratio of black to white in the projected image of the LED projector, which 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.
Projection screen size
It refers to the size of the screen diagonal that is projected. To deliver the required size, the LED projector needs to be installed at a corresponding distance from the projection screen. At present, mainstream LED projectors can easily release large-screen images of more than 100 inches, and some high-brightness projectors can also deliver more than 200-inch screens.
Projection distance
Refers to the horizontal distance between the LED projector lens and the screen.
LED projector rear projection
Some users install the LED projector on the back of the projection screen to avoid problems such as frontal collision and shielding. However, the projection screen needs to select the back screen, and it is better to prepare a dark room for the projector. Get better projection effects.
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, usually displaying “NOSIGNALâ€.
If your computer has a higher 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.
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.
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.
With the increasing popularity of projection equipment, the market share of new projectors for LED projectors is increasing in daily life. Here's a brief introduction to some of the projector's conceptual knowledge. LED (Light Emitting Diode), also known as light-emitting diodes, its body is an electroluminescent semiconductor material, plus a forward voltage across it, the current will flow from the LED anode to the cathode, the semiconductor crystal emits different colors from UV to infrared The stronger the light, the stronger the current. 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 10,000 hours.