"Light out" is the main technical indicator of the projector. "Light out" is usually expressed in terms of luminous flux, which is the ability to describe the intensity of the visual response of the light source radiation in a unit of time. The unit is lumens. The unit of luminous flux indicated by the LCD projector is ANSI lumens. ANSI lumens is a method for measuring the luminous flux of the projector developed by the American National Standards Institute. It measures the illuminance of each point on the nine intersections of the screen "Tian" font, multiplies it by the area, and then finds The average value of nine points is the ANSI lumen value of the projector. The light output of the liquid crystal projector is mainly determined by the brightness of the light source and the light path system and the transmission or reflection ability of the liquid crystal panel. At present, high-brightness projectors use technology to improve light utilization without increasing the power of the light source. A PS light conversion board is provided on the optical path to redirect the S light reflected in the vertical direction after polarization and P light transmission to improve the light. effectiveness. The unit of brightness for DLP projectors is ANSI lumens. The DLP projector (digital light processing technology from Texas Instruments) uses a digital micro-mirror device (DMD) as the light valve imaging device to amplify the signal and output a large-screen image. Most DLP projectors use one DMD light valve slice, and use color filters to rotate out the colors. LCD projectors and DLP projectors are currently the main models in the Chinese market. Due to the difference in test environment, the ANSI lumen indicators of the machines of different brands are different. However, the ANSI lumen values ​​provided by the manufacturer basically reflect the brightness level of the projector. The light output of a CRT (three shots) projector is expressed in peak lumens, that is, on a test image of a white window, with the scan line still clearly visible, measure the maximum illuminance (LUX) of the white window multiplied by the area of ​​the white window (M2) To determine the luminous flux of the projector, the peak lumens has very good practical significance. Since any video image you see cannot be all white, the proportion of white generally accounts for about 20% of the image area. At the same time, the CRT projector relies on the electron beam in the projection tube to scan the image on the fluorescent screen. The beam current depends on the emission capacity of the cathode. Under normal conditions, the electrons emitted by the cathode are controlled by the negative potential difference between the cathode and the cathode. An electron cloud is formed, and as the potential decreases, the electron flow is quickly pulled to the anode ---- fluorescent screen, CRT tube can provide a higher pulse current, so the brightness of the window signal on the screen can be higher, and if the picture is a full white field Due to the limitation of cathode emission capacity, only the average beam current can be provided, and the brightness on the screen will be greatly reduced, only about 1/5 of the peak current. Because the CRT projection of the cathode and the window signal used are different in size (10% -25%), there is no absolute comparability of the brightness indicators of the products of various manufacturers. The brightness of the projector has a lot to do with the distance between the projector and the screen and the angle of view of the screen and the gain index during testing and user use. It is also a point that needs attention.
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Description of the 7.5QT ice bucket:
Name:7.5QT Ice Bucket
Type: bucket, coolers, beer can holders
Material: metal,iron
Feature: eco-friendly
Fields of applications: bar, party, hotel, outdoor activity
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With the development of projector products, various manufacturers continue to launch projector products with higher brightness. The brightness of the projector has reached more than 2000ANSI lumens, but during the user's purchase process, the understanding of the projector brightness index is often refuted. Different brands of machines with the same brightness index are far from each other in comparison, so how to understand the brightness index of the projector? 
