Clear main specifications
Before purchasing a projector, first make clear the three basic technical indicators of the projector:
1. The brightness of the international standard unit ANSI lumens (America National Standard Institute), the measurement environment is as follows:
The distance between the projector and the screen is 2.4 meters; the screen is 60 inches; the brightness of 9 points of the projected picture is measured with a light pen in a pure dark environment; the average value of the brightness of 9 points is obtained, which is ANSI lumens. At present, some domestic manufacturers have a nominal brightness of peak lumens, and the actual brightness has no high nominal value. Users need to distinguish them.
2, weight
If the main application is teaching or business, this should be a portable model, portable: 2.1~3kg; ultra-portable: 1~2.0Kg, if applied to industrial monitoring, you should choose a model with better heat dissipation or long-time booting. There is no need to ask for weight. Professional high-brightness engineering projectors weigh more than 50kg.
3, resolution
If the software being displayed is based on general teaching and word processing, the resolution is 800x600 (SVGA); if the main notebook is connected or the requirements are higher, choose XGA (1024x768); if you need to display geography For complex graphics such as information or power grid, it is recommended to use SXGA (1280x1024) or UXGA (1600x1200) products. When displaying high-resolution graphics signals, you must select a digital machine with a line frequency above 60KHz.
Clear purpose of use
The projector is a relatively high unit price product, so it is clear that the most important purpose of use, targeted purchase of projectors, can save you money and reduce unnecessary troubles.
If it is mainly used for teaching or training, you should choose a resolution of 1024X768, choose a product with a brightness of 1500-3000 lumens according to the size of the environment and the projected area. If it is not fixed installation, you can choose about 3kg.
If it is mainly used in mobile office and business meetings, we should focus on selecting lightweight products. Single-chip DLP products can be compact because of the simple light weight. At present, there are about 1kg of products, which is equivalent to half A4 paper. Because mobile office is often connected to a laptop, it is recommended to choose 1024X768 resolution.
If it is mainly used in large conferences or training venues, it is usually fixed installation, so you don't have to think too much about the weight. The resolution should be 1024X768. The brightness should be determined according to the projected area. In general, if the projected area is larger than 150 inches (equivalent to 3mX2m), you should select more than 3000 lumens.
If it is mainly used for industrial monitoring and command, select the resolution according to the above first item, select the brightness according to the projected area and the front/rear projection, and also pay attention to the three DLP products according to the picture quality requirements, whether it needs to be turned on for a long time and the budget. Or three LCD products. Three DLP products have many advantages such as long-time booting, high image quality, long lamp life, etc., but they are expensive.
If it is mainly used in home theater, you can choose the home products of major manufacturers. These products have a resolution of 964X544, 854X480 or other 16:9 resolution, and have many functions suitable for home use, but these products have low brightness, mostly less than 1000 lumens, and the projected area is not suitable for too large, so you can also choose commercial The main multi-function model, the brightness can be selected from 1000-2000 lumens, and the resolution of 800X600 is enough.
Determine the projected area
In general, the projected area and the corresponding projection screen are selected according to the 2×6 principle, that is, the 2× screen height is the distance from the first row to the screen, and the distance from the farthest seat to the screen is 6× the screen height, but this Not suitable for all occasions, it should be remembered that because the brightness index of the projector is the total output of the light, the larger the projected area, the lower the brightness per unit area, the higher the brightness requirements of the corresponding projector.
If the room size is small, an optional LCD projector is available. When the display area is large, there is no sunlight, and the lighting is dark, you can choose a low-brightness about 800-1200 ANSI projector. When the requirements for ambient light are not high, the display area is extremely large, and high-resolution graphic signals are displayed, an LCD projector can be selected.
Confirm the way of use
The projector installation method is divided into a table type front projection, a table type rear projection, and a ceiling rear projection. The front projection is the projector's viewer on one side; the rear projection is the same as the audience at the ends of the screen. If it is used temporarily, you can choose the table type front projection. This method is greatly affected by the ambient light and the layout is messy. If it is used fixedly, you can choose the ceiling method. If the space is large, there is a coordinated arrangement during the civil construction. The overall effect of the rear projection method is the best. If the space is small, the method of rear projection refraction can be selected. In addition to the use of rear projection in industrial environments and high-end conference environments, it is generally possible to use a positive investment for cost savings.
On-site shopping skills
After determining the selected model, how to identify the actual indicator of the projector through the projected screen under the on-site power-on condition?
Check the horizontal scan tracking frequency range according to the horizontal scanning frequency range given on the technical indicators, select the high, medium and low frequencies from among them, and calculate the image resolution corresponding to the three frequency points. Check if the projector can display normally at these three resolutions. If the line is out of sync, that is, the picture is twisted or shaken, it means that the horizontal scan is poor.
Check the focusing performance. Use the test square generated inside the projector, or the signal generator, the computer generated test square, adjust the focus to the best position, change the image contrast from low to high, and observe the horizontal and vertical lines of the square. Is there a defocus phenomenon? If any, the focus performance is poor.
Checking the video bandwidth video bandwidth directly affects the details of the video. Use a computer or signal generator to generate the highest resolution white background signal that a projector can achieve, and observe whether the smallest character graphic on the screen is clear. If the video bandwidth of the projector is insufficient, the horizontal lines on the screen are relatively solid, while the vertical lines are imaginary and the image details are blurred.
On-site inspection of the LCD projector produces an all-white image to observe how uniform the color is. In general, the color uniformity of liquid crystal speculation is difficult to reach a higher standard. However, the uniformity of the quality of the projector is relatively good. In addition, the dustproof of the liquid crystal projector is a problem, and a small dust, such as falling on the liquid crystal panel or the lens, may be amplified to be clear. On the all-white image, the optical focus is adjusted from small to large, and if there are colored spots on the screen, there may be dust on the liquid crystal panel or the lens, and it is estimated that the dustproof system of the machine has a problem.
Focus on service quality
The value of the projector is high, and the accessories and consumables (light bulbs) are also expensive and mostly special items. Therefore, before using, consider a certain cost of use, and inspect the service level of the supplier in advance to understand the service content, such as engineering construction. To examine the supplier's qualifications and project experience. At present, there are still a large number of projectors in China that are sold through abnormal channels. For these products, after-sales service is often difficult to obtain. Users should pay attention to whether they have the original out-of-print warranty.
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