Weak current College】 【projector and projection screen best match selection guide-Power By】 【China power house network.

<br> Large-screen projection system design and application involves projector performance, screen performance, ergonomics, optics, civil construction and other branches of engineering aspects are complementary and can eventually get good display and viewing. 1. the purchase of the projector first clear .the nature of the source you want to show that its row frequency is the number that is determined by the old video card output. According to the nature of the displayed information source, the projector can be divided into ordinary video machine, digital machine, graphics .machines. Only show all TV signals, such as karaoke Hall video, you can select a normal video machine; you want to display a VGA output signals, available row frequency data projector 60KHz following, select the digital machine, in order to conserve resources, .and do it right, you can press the actual projection content decision to purchase what grade projector, if the software is to show the General teaching and word processing-dominated, you choose a resolution of 640 × 480 (VGA); if the requirements are .higher, you must select a SVGA (800 x 600), such as LP260/LP340, (1024 × 768), such as when displaying LP350 high-resolution graphics signals, shall select row frequency in more than a digital machine 60KHz. Confirm installation .projector installation into the table type is cast as the vote, suspended ceiling, desk projection, ceiling-mounted projection. Positive vote is the projector at one side of the audience; rear projection is a projector and projection screen audience at both ends. If the .temporary use, choose the table style is, in this way the environmental effects of light larger layout messy. As a fixed ceiling, you can choose to use. If the space is large, construction time and Manpower, select backlight mode works best as a .whole, such as the space is small, you can select the backlight refraction method. Hows display environment, such as room size, lighting, such as room area is relatively small, optional LCD projector. When you display a larger area of the environment, .there is no sunlight, lighting lighting dimmer, relatively fixed, you can select CRT projector. When the ambient light requirements, display area shows the large, high resolution graphics signals, you can select LCD light valve projector; you don't have to display .high resolution graphics signals, and the pursuit of the display's color uniformity and sharp, select DLP projector. On-site purchase skills determine the selected models, on-site power conditions, how to vote through the screen to identify actual indicators of projector? check .the horizontal scan tracking frequency range according to the specifications given on the horizontal scan frequency scan range, choose high, medium, low three frequencies, calculate the three frequency corresponds to the image resolution. Check the projector in the three resolutions, whether or not to .display properly. If rows are not synchronized, namely screen twist or jitter, explains horizontal scan tracking bad. Check the focus performance with projector homegrown test box, or signal generator, computer-generated test box, will focus to the best position, move the .image contrast changes from low to high, the observation of graph of horizontal and vertical lines are not defocusing phenomenon and, if so, then the focus performance. Check the video bandwidth video bandwidth directly affect the video details section. Use a computer or signal generator .generates a projector can achieve maximum resolution of white base graphics signals, watch the screen of a minimum graphics is clear. As side machine video bandwidth is low, the screen displays the lines, while the vertical line of deficiency, image details. LCD projector for .on-site inspection and made a white image, the observation of color uniformity. In General, LCD projector color uniformity is very difficult to achieve a higher standard. But good quality color uniformity of machine time relatively better. In addition, the LCD projector dust .is a challenge, a very small dust, such as falling into LCD panels or glass, you may zoom in very clear. In an all white image, from small to large adjustment optics focus, watch the screen if any color spots appear, you may .be a flat plate or lenses on and off the dust, it is estimated that the machines have problems anti-dust system. 2. the screen selection according to the actual use to select the correct screen to meet your needs, and you can get the .best of the drop shadow effect. The following instructions for you to choose the one most appropriate guidance on the screen. Although these instructions will apply in most situations, but have each introduced strict rules will depend on your actual use environment. The correct choice of .projector screen of four main steps: choose screen type: the type of your choice should be the most suitable for your specific needs. For example: front projection screen needed to select the type of wall-or ceiling set into type, manual and electric specifications .; the needs of the projection screen may choose hard curtain or soft screen. In General, if you need fixed projection space, then hanging wall, hanging days fancy or three-legged stand-by screen is your best choice. If you want to move .the screen to a different position, portable screen (Insta-Theater) is your best choice. Choose the best screen-size: to choose the best screen size depends primarily on the use of space to plan how much of a good audience seats and location .. The first rule is to choose the right audience screen - instead of selecting the right projector screen, that is to say to the audience's experience in the first place. We offer the following selection screen size formula for your reference: * screen height approximately .equal to from the screen to the Auditorium last row seating distance of 1 / 6, which enables each row of the audience can clearly see the contents of the projection screen. * The screen to the first row of seats, the distance should be greater than .twice the height of the screen. * The bottom of the screen the seat surface should leave the Auditorium at least approximately 122 cm or so (this provision on the former cast vote screen after the curtain and apply). Choose your projection equipment needs of the .format (frame rate), a list of common formats are as follows: projector screen fabric choice: your choice of screen fabrics are suitable for your projector and audience needs. However, if a screen needs supply many projectors, screen fabric should select fit to .screen demanding needs of the projectors. For example, when you have slide projector (or overhead projectors) and video projector, because the projector light output ratio slide projector (or overhead projectors), so you should choose the reflectivity (gain) parameter adjustment- .Projector fabrics. However, because now the brightness of most projectors are quite high, so using reflectance (gain) than the glass beads (Glass Beaded) curtain low white plastic (Matte White) screen but you can get the better of the drop shadow effect .(for example: Visual range). In the specific purchase before the projection screen, you need to know the main specification of the screen. Gain: screen Tablet incident light. In the incident light angle must, the incident light flux invariable, screen brightness .in one direction and ideally brightness ratio is called the direction of luminance coefficient, the maximum value is called the gain of the screen. Usually the matte white walls of the gain is set at 1, if the screen increases is less than 1, will weaken .the incident light; if the screen increases is greater than 1, the reflection or refraction more incident light. Perspective: screen in all directions of reflection is different, and in the horizontal direction from the center of the screen, the lower the further brightness; .when the brightness is reduced to 50% of the viewing angle, defined as the angle of view. View images in perspective, brightness within satisfactory; in addition to the viewing angle, the image brightness is not enough. Generally speaking, the higher the gain .of the screen, the smaller the angle (metal curtain), gain, the greater the angle of view (white plastic screen, take care of the students, the Education Act the use of white plastic curtain) more popular glass bead screen. Screen from .function into reflective and transmissive two categories. Reflective for positive vote, transmissive for rear projection. Positive vote screen is divided into planes curtain, arc-shaped scene. Flat screen gain is relatively small, viewing angle is large, light must be weaker; arc .-shaped scene gain larger, smaller, from the perspective of ambient light can be strong, but the screen is reflective of the incident light in all directions. From texture are divided into glass curtain, metal curtain, embossed plastic curtain, etc., for .the general scope of application. Screen size is the size of the diagonal. General video image aspect ratio is 4: 3, the Education Act as squares. If a 1.83m (72-inch) screen, based on the Pythagorean theorem, we ' .ll draw the screen width to height 1.1m 1.5m,..