LED projector function introduction and analysis

LED (Light Emitting Diode) is also known as a light-emitting diode. Its main body is an electroluminescent semiconductor material. A forward voltage is applied across it. The current flows from the anode of the LED to the cathode. The semiconductor crystal emits different colors from ultraviolet to infrared. The light, the stronger the current, the stronger the light. The principle of LED illumination is different from traditional UHE and UHP bulbs. It does not generate a lot of heat during the illumination process, so the lifetime can reach more than 10,000 hours.

With the increasing popularity of projection devices, the market share of new projectors for LED projectors is increasing in daily life. Here is a brief introduction to some of the conceptual knowledge of the projector.

LED projector resolution

The resolution of the LED projector is expressed by multiplying the number of horizontal pixels in the picture by the number of vertical pixels. The resolution of an LED projector does not refer to the resolution of the signals that the LED projector can receive, but 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, when the signal resolution is higher than the projector's physical resolution, the picture details will be significantly lost. Common resolutions and representations are as follows:

SVGA: 800x600 economical projector common resolution

XGA: Resolution for 1024x768 mainstream business and educational projectors

SXGA+: 1400x1050 resolution for high-end projectors for high-end professional applications such as images

480p: resolution for 852x480 low-end home projectors

720p: resolution for 1280x720 or 1280x768 mid-range home projectors

1080p: resolution for 1920x1080 or 1920x1200 high-end home projectors

LED light source

As we all know, LED projector bulbs are the same expensive consumables, which have a certain service life. When the battery is used for a long time, the bulb will age. Replacing the bulb is a problem that the projector user must consider. A major disadvantage of television.

Over the years, major projector manufacturers have been working hard to develop bulbs that have been used for a longer period of time. The emergence of LED projection technology has opened up a new situation in the development of projectors. Compared with traditional projectors, the biggest advantage of LED projectors with LED light source is that they do not need to change the bulb frequently. The life of the bulb is 10,000-20000 hours or longer, and the user does not need to worry about the loss of the projector bulb.

LED (Light Emitting Diode), also known as LED, has long been used in display and lighting applications. Its main body is an electroluminescent semiconductor material. A forward voltage is applied across it. The current flows from the anode of the LED to the cathode. The semiconductor crystal emits light of different colors from ultraviolet to infrared. The stronger the current, the stronger the illumination. .

The principle of LED illumination is different from traditional UHE and UHP bulbs. It does not generate a lot of heat during the illumination process, so the lifetime can reach more than 10,000 hours. Since the LED is a cold light source, it does not generate a large amount of heat like a metal halide lamp, and reduces the complicated optical path structure required by the original light source, so that the requirement for the projector heat dissipation system can be reduced, and the volume can be compared. It turned out to be much smaller. On the small side, LED projectors are generally kept below 1 kg, and some even only about 0.5 kg. This weight is easy to carry and move. And the noise is much smaller.

LED projector performance

Short focus

Short-focus projection, as the name suggests, is an LED projector with a shorter focal length. What are the benefits of short-throw projection? The biggest benefit of short-focus LED projectors is that the projection distance required to achieve the same size is shorter. Such LED projectors no longer require a large space scene in the projection screen, so they are widely welcomed by users such as small and medium-sized enterprises and education markets. For home users, short-focus LED projectors are equally important, especially in some living rooms. Small home users.

Short-focus LED projectors use a wide-angle or fisheye lens, and the manufacturing process and cost of the lens are often higher than ordinary lenses. The high cost factor is not the main reason for the popularity of short-throw projectors.

brightness

The brightness of the LED projector refers to the light output of the LED projector, which is expressed by the luminous flux (the energy that the light source radiates to the surrounding space per unit time to make the human eye feel), and the unit is lumen. For projectors, the higher the lumens, the stronger the brightness.

However, since the LED projector's light bulb is relatively expensive, and the power is limited, and at the same time, increasing the power will cause problems for the heat dissipation of the LED projector, so it is costly for the LED projector to increase the brightness.

Evenness

This is a concept related to brightness. The ratio of the intermediate brightness of the projected picture to the surrounding brightness is generally defined as 100%. The brightness of the image projected by the LED projector onto the screen is not completely uniform. In some places, the brightness will be higher, and in some places, the brightness will be lower. Of course, the more uniform the brightness distribution of the projector, the better. Contrast

The ratio of black and white in the projected image of the LED projector is the gradient from black to white. The larger the ratio, the more gradients from black to white, and the richer the color.

Projection screen size

It refers to the size of the diagonal of the projected screen. To deliver the required size, the LED projector needs to be mounted at a corresponding distance from the projection screen. At present, mainstream LED projectors can easily deliver large screens of more than 100 inches, and some high-brightness engineering projectors can also deliver images of more than 200 inches.

Projection distance

Refers to the horizontal distance between the LED projector lens and the screen.

LED projector rear projection

Some users will install the LED projector on the back of the projection screen to avoid the collision, occlusion, etc. of the front side. However, the projection screen needs to select the back screen, preferably a separate dark room for the projector. Get better projection results.

Horizontal scanning frequency (line frequency)

Also called the line frequency, the horizontal scanning frequency of the LED projector has a range. If the horizontal scanning frequency of an input signal from an image source such as a computer is outside this range, the LED projector will not be able to deliver, and usually displays "NOSIGNAL". If your computer display configuration is high, it is recommended that you do not buy low-end projectors with poor horizontal scanning frequency, otherwise you will not be able to project the ideal image effect or even use it.

LED projector's video input and output interface

The video input interface of the LED projector refers to the interface that connects the computer display signals, so that the computer video signal is transmitted to the LED projector through the input interface to deliver the image of the computer. Some LED projectors also have a video output interface, through which you can connect to other display devices such as monitors and LCD TVs. If the projector does not have this interface, you can use a VGA splitter to connect the display.

Vertical scanning frequency (refresh rate)

Also called the frame rate or the refresh rate of the displayed image. If the vertical scan frequency of the input signal from the computer is outside this range, the projector will not be able to serve. Within the range, when the vertical scanning frequency of the computer is set to a high value, the projection effect is good.

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