[On the use and choice of projector screen] Projection screen purchase common sense
Content navigation: Page 1: Types of projection screens Page 2: Introduction to technical indicators of projection screens Page 3: Basic technology of projection screens Page 4: Reasonable selection of projection screens Page 5: Maintenance and maintenance of projection screens
Today, projectors have become a must-have product in daily life. Not only schools, government and other departments, but even ordinary individual users have begun to choose projection products. In a projection system, the projection screen or projection screen is also a part of the entire projector optical system. It can not only present the projected image, but also have a greater impact on the image display effect.
However, in the actual process, many people know very little about projection screens, and often overlook the importance of projection screens in the process of using projection. In the projection process, a good projection screen can enhance the projection effect by nearly 20%, especially in digital movie projections. In order to present a high-quality movie picture, it depends on three main factors, including the level and appropriateness of the projector. The projection environment and the quality of the projection screen, and whether the projection screen is suitable for supporting projection products will better improve the projection level of the image screen.
Types of projection screens
First, let's first introduce the types of projection screens. Generally speaking, projection screens can be divided into two types: front projection and rear projection. Front projection screens can be divided into soft screens and hard screens. The soft screens include white screens, pearlescent screens and metal screens. The hard screens have flat screens and curved screens. Rear projection screens are also available. It is divided into soft screen and hard screen.
Front projection screen
In front projection screens, we can usually see manual hanging screens, electric hanging screens, two-leg bracket screens, and triangle brackets.
Various types such as frame screen and hanging screen. Among them, manual hanging screens, double-leg bracket screens and tripod screens can be used in one scene, which can be applied to different places, such as various mobile digital movie screenings; while electric hanging screens and hanging screens are suitable for conference rooms, theaters And other fixed places.
Rear projection screen
Rear projection screens can be divided into hard rear projection screens and soft rear projection screens. Generally speaking, the screen effect of hard rear projection screens is better than that of soft rear projection screens. Therefore, in actual projection In the application process, there are still more applications of rear projection hard screens.
Types of projection screens
Generally speaking, soft screens can also be divided into white screens and glass bead screens according to different production processes and surface coatings.
First introduce the white matt screen. This kind of projection screen is similar to white canvas. It is made by spraying white paint on a special fabric and after a simple treatment. More importantly, this kind of screen has a rough surface, which has the least impact on image clarity, and the brightness of the projection screen appears uniform, and it has no directionality, and has many advantages such as low price, wide viewing angle, and soft visual effects. advantage.
However, the disadvantage of this white non-light curtain is that the brightness gain is not high. During the projection process, it still has high requirements for the light-shielding effect of the projection environment. Therefore, it is more suitable for use in small and medium-sized conference rooms, and the effect will be better when used with high-brightness projectors.
Let’s talk about the second kind of glass bead sand screen. This kind of screen is evenly coated with small glass beads on the surface of the screen base, and this kind of small glass beads can play a role in concentrating light, so this screen has a certain In addition, the incident light is basically reflected in the original direction, and the light gain is quite high.
And this kind of screen is moderately priced, has the advantages of wide viewing angle, aging resistance, not easy to fade, and good color reproduction. The disadvantage is that it is not suitable to be rolled up repeatedly, because in this case the glass beads will easily fall off, which will also affect its future use effect.
However, this glass bead sand screen has the characteristics of strong directionality and high light gain, which also makes it have a wide range of adaptability. In projection classrooms with high requirements for brightness, this screen is a better choice.
At present, in the domestic market, there are two types of soft screens, domestically produced and imported. Imported screens are characterized by good quality and generally have a service life of 2 years, but their prices are relatively expensive; while domestic soft screens are relatively cheap. Moreover, the specifications are complete, and the after-sales service is also relatively good, but it will gradually turn yellow and curl after one year of use.
Hard screens are generally made of metal, which can be divided into aluminum foil reflective screens and silver powder screens. The surface of the screen base of the aluminum foil reflective screen is generally plated with a layer of aluminum foil, and the aluminum foil is used to reflect the projection light; the silver powder screen is evenly coated with silver powder on the screen base and makes it reflect the projection light.
The advantage of these metal screens is that the reflection coefficient is high, and the brightness of the reflected light is greater than that of the white non-light screen. When used with a low-brightness projector, it can improve the visual effect; but the disadvantage is that it is expensive , There is still a problem of viewing angle, and it uses metal material, which is relatively heavy and easy to be oxidized. Therefore, it is not suitable for use with home and professional-level projections, and can play a more important role in the field of business projections.