Get rid of the fog of projector data, select projection
For those who don’t know about projectors, buying a projector is a troublesome thing. When buying a projector, it is inevitable to check the parameters of the projector. When there is no place to experience the actual effect of the projector, the parameters play a decisive role. Looking at the current projector market, we can say that the parameter labels of the projector are not very standardized, and the standards adopted are also a bit vague, which makes some friends who don't know much about the projector feel confused about these parameter tables. Today, the editor will take everyone to understand these parameters, hoping to help those who buy projectors. Resolution Now the projector market likes to use XGA, 720P, 1080P and other concepts when it comes to resolution. Generally speaking, XGA is suitable for business use, 720P is for primary home projection, and 1080P is commonly referred to as Full HD, or FULLHD. Home theater projectors generally use this resolution. You may encounter this situation when you buy a projector again. It is obviously an XGA projector, but some articles or shopping guides will tell you that the highest resolution of the projector is WUXGA (1600X1200). Here everyone should pay attention to ' The word 'maximum' means that the native contrast ratio of the projector is XGA (1024X768), but in the case of non-point-to-point output, WUXGA sources can also be broadcast. In fact, the effect of this projection is still XGA-level. For consumers who require resolution, they must pay attention to this problem. After the province bought it back, it was found that the native resolution of the projector was not the standard required by itself. Brightness The brightness problem of the projector has also puzzled many people. The brightness value on the projector parameter table is often very different from the actual application. This is because the measurement environment is different, the standards used are different, and the manufacturer deliberately elevated and other factors. of. Most manufacturers use ISO lumens to indicate the brightness of the projector, because this method can make the parameters of the projector 'look better'. In fact, ANSI lumens has a better reference effect on the actual brightness effect of the projector. ANSI lumens is a method for measuring the luminous flux of a projector formulated by the American National Standards Institute. The specific measurement method is: first confirm that the distance between the projector and the screen is 2.4 meters, the screen projection size is 60 inches, and the light metering ratio is used to measure the screen 'tian' The illuminance of each point on the nine intersections of the glyph is multiplied by the area to obtain the brightness of the 9 points of the projection screen, and the average value of these 9 points is calculated to obtain the ANSI lumens. Since the user does not have an instrument to measure the actual brightness of the projector, it is recommended that everyone use the portal website to check the evaluation of the relevant projector when buying the projector. Generally, there are ANSI lumens test results. Don't just look at the parameter table of the projector. Contrast If we find several projectors for comparison, we will find that the contrast between them is very different. Some are 2000:1, and some are tens of millions to one. Is there really such a big difference in their contrast? The answer is no. Due to the technical characteristics of DLP and LCD projectors, their native contrast is determined by the hardware, so it is unrealistic for the gap to be so large, because the DMD chip and LCD panel used are not so large. The difference. The reason why the contrast gap is so large is that the manufacturer introduced the concept of dynamic contrast, but deliberately did not mark the word 'dynamic' when marking, resulting in ambiguity. Of course, dynamic contrast still has an effect, it has a good effect on improving the black level performance of the projector, but this technology is often applied to high-end home theater projectors, in the low-end projection, the performance of dynamic contrast often It is not as obvious as its 'number' has increased. Lamp life At present, most of the light sources of projectors use lamps, and the life of the lamp is generally between 3000 hours and 6000 hours. However, there are two main types of light bulbs. One type of metal halide light bulb whose brightness gradually decays and finally extinguishes. It has always been an ultra-high pressure mercury lamp whose brightness is not obvious but will suddenly go out. It is said that their life spans are almost long, but the actual use effect is absolutely different. Consumers must pay attention to the type of bulbs they buy when buying projectors. (There is also a xenon lamp, which is commonly used in high-end engineering machines. Because of its high brightness, the life span is only 2000 hours.) Through analysis, we know that the standard resolution and the highest resolution of the projector are not the same. Know what the standard resolution of the machine is. Regarding the brightness problem, it is not reliable to just look at the parameters. I suggest that consumers can read the evaluation more and find the actual measured lumens for reference. In addition, consumers should also pay attention to the lamp type of the projector, and avoid buying back the projector whose life is different from their own expectations. For the purchase of projectors, online shopping, the projector market parameters are not standardized, consumers should not blindly trust the data. If you go to a store to buy, consumers should also be smarter, so as not to fall into the trap of shopping guides.