Like projectors, projectors have a resolution problem. Only good resolution can reflect the overall picture effect. If the resolution is low, the picture texture is relatively low, so the resolution has a certain effect on the picture display. So today I will share with you the problem of projector discrimination. I hope that friends who do not understand can have a simple understanding and understanding through this article. Standard resolution The original resolution of the image projected by the projector is also called real resolution and physical resolution. Corresponding to the physical resolution is the compression resolution, it is the physical resolution that determines the clarity of the image, and it is the compression resolution that determines the applicability of the projector. The physical resolution is the resolution of the LCD panel. The liquid crystal body is divided on the LCD liquid crystal panel by a grid, and one liquid crystal body is a pixel. Then, when the output resolution is 1024 × 768, it means that 1024 pixels are divided in the horizontal direction of the LCD panel and 768 pixels are vertically divided. The higher the physical resolution, the greater the range of receivable resolution, and the wider the adaptability of the projector. Physical resolution is usually used to evaluate the grade of LCD projectors. Currently, SVGA (resolution 800 × 600) and XGA (1024 × 768) are the most widely used in the market. The price of XGA products is about 3000-5000 higher than that of SVGA. There are two common ways to express the resolution of a projector, one is expressed in the form of TV lines (TV lines), and the other is expressed in the form of pixels. When expressed as a TV line, the meaning of its resolution is similar to that of a TV. This resolution is mainly provided to match the TV signal connected to the projector. When expressed in pixels, it is usually expressed in the form of 1024 × 768, etc. In a sense, the limitation of this resolution is a certain requirement for the horizontal and vertical frequencies of the VGA signal input to the projector. When the horizontal or vertical frequency of the VGA signal exceeds this limit, the projector cannot project normally. The choice of projection resolution can be determined according to the actual projection content. What kind of projector to buy? If the content to be displayed is based on general teaching and word processing, choose SVGA (800 × 600). If you want to show fine images (such as graphics) Design), you need to buy XGA (1024 × 768). Since the mainstream resolutions of notebooks and desktops are now up to the XGA (1024 × 768) standard, it is recommended to buy XGA (1024 × 768) projectors as much as possible under budget. Maximum resolution Also known as the highest resolution that can be displayed, it refers to the highest resolution of the input signal that the projector can display. Through the image processing algorithm, the projector can zoom the input signal to achieve full-screen display of the signal. If it exceeds this range, the projector cannot display the picture normally. Earlier projectors all used the line extraction algorithm, namely: linear compression technology, but this algorithm has a problem of dropping the line. At present, the products of various manufacturers have launched new algorithms for compressing signals, namely: intelligent compression, which can solve the problem of disconnection. It is recommended that under the same conditions of other performance indicators, prefer to choose products compatible with higher resolution, so that it can adapt to more signal range. VGA: The full name is Video Graphics Array. This kind of screen is basically extinct now. The maximum resolution is 640 × 480, but there are still some small portable devices still using this screen. SVGA: The full name is Super Video Graphics Array, which is a substitute for VGA screen. It supports a maximum resolution of 800 × 600 and a screen size of 12.1 inches. Due to the low pixels, there are few laptops using this screen at present. XGA: The full name of Extended Graphics Array, which is a LCD screen commonly used in notebooks. Nearly 80% of notebooks on the market use this product. It supports a maximum resolution of 1024 × 768, with screen sizes ranging from 10.4 inches, 12.1 inches, 13.3 inches to 14.1 inches, and 15.1 inches. SXGA +: The full name is Super Extended Graphics Array. As an extension of SXGA, SXGA + is a screen specially designed for notebooks. The display resolution is 1400 × 1050. Since the horizontal and vertical dot pitch of the notebook LCD screen is different from the ordinary desktop LCD, the display accuracy is much higher than the ordinary 17-inch desktop LCD. UVGA: The full name is Ultra Video Graphics Array. This screen is applied to the 15-inch screen notebook and supports a maximum resolution of 1600 × 1200. Due to the high requirements on the manufacturing process, the price is relatively expensive. Only a few high-end mobile workstations are equipped with this type of screen. Many people want to buy a wide-screen home theater projector because the 16: 9 ratio is the standard format for HDTV signals. At present, 16: 9 projectors on the market mainly have three resolutions: 854x480, 1024x576 and 1280x720. In the implementation of a new scan display standard, they are called 480p, 576p, and 720p. (Organized by China Educational Equipment Purchasing Network)
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