Since the brightness of the projector is fixed, the larger the area of ​​the projected image, the smaller the average brightness, and the two are inversely proportional. Reasonable tuning of the use environment, choose the right curtain, you can achieve twice the result with half the effort.
Reduce the brightness table with the size of the screen (Standard: 2000ANSI, 40") | |||||||
Screen size | 40" | 70" | 100" | 130" | 150" | 200" | 250" |
Brightness ratio (%) | 100% | 33% | 16% | 10% | 7% | 4% | 2.50% |
Two degrees (ANSI) | 2000 | 650 | 320 | 190 | 140 | 80 | 50 |
At least 500 lux (Lux) is required if you want to see the clear image in the back . 500 lux or more places, if using the screen, should this case, as the image content on the table top 16% decrease in luminance to 100 with the size of the "screen above, it is necessary to use a high luminance screen. | |||||||
At least 500 lux (Lux) is required if you want to see the clear image in the back.
If you use a screen at a location above 500 lux, you should use a screen with a size of 100" or more. At this time, the brightness is reduced to 16% like the contents on the upper table, so a high-brightness screen must be used.
Due to the wide variety of screens, the various screens have different contrast performances in light and dark, and the picture quality is different. Therefore, it is necessary to understand the compatibility of the projection screen and the projector, the placement position and the influence of the audio-visual environment, and then make a choice according to local conditions.
Projection screens are currently divided into soft screen and hard screen.
The soft screen is divided into a normal white screen and a bead screen. The manufacturing process and surface coating are different.
Ordinary white screens are inexpensive, have wide viewing angles, have soft visual effects, but have low gain on light, so they are recommended for use in small and medium-sized conference rooms.
The beaded screen has moderate price, wide viewing angle and high gain, but it should not be rolled up repeatedly. Otherwise, the glass bead will fall off easily and affect the use effect.
Some hard screens are metal screens that enhance visual effects when used with low-brightness projectors. However, it should be noted that the hard screen is expensive and easy to oxidize.
In the absence of a curtain, the projection effect of the projector on a normal white wall is barely acceptable.
Since the projector is divided into front projection and rear projection, the curtain is also divided into front projection and rear projection.
The front projection screen is divided into a wall-mounted type, a ceiling mounted type, a bracket type and the like. According to the way of use, it is divided into manual and electric specifications.
For use in a fixed position, it is best to choose a wall-mounted, ceiling-mounted screen. If you need to use it frequently, you can choose a portable projection screen, and the small three-legged bracket is the best choice.
The orthographic projection has a manual hanging screen and an electric hanging screen type; a two-legged bracket screen; a triangular bracket screen metal plane, an arc screen.
There are various specifications for the rear projection screen. The hard rear projection screen is divided into a hyperbolic screen and a diffused screen, and a soft rear projection screen and a diffused screen. The hard screen has better picture quality than the soft screen.
According to the action mechanism of the projection screen, it can be roughly divided into the following categories.
Powerful Roll-up Spring Mechanism: This is a typical intensive projection screen that can be attached to the ceiling or wall and can be pulled down when needed. Before selecting, pay attention to check whether the pull-down mechanism of the projection screen is stable and can be stopped. Some models have the ability to reduce vibration when fully retracted, and you can choose a projection screen that does not produce V-shaped wrinkles on the top and bottom.
Vertical roll-up: This projection screen is portable and is used primarily in large screens in some countries. Convenience is also an important selection point, but the mounting surface and storage conditions should be checked before purchase, as this type of projection screen requires a certain support mechanism on the side of the projection screen.
Frame monitoring structure: This type of projection screen surface is formed by pulling a projection screen along a circular frame with a rope or a spring. It is not suitable for carrying or storing, but it can ensure the flatness of the projection screen. In particular, as long as the projection screen is tilted, it can be completely retracted while maintaining the flatness of the reflection type.
Built-in furniture: This projection screen can be incorporated into the furniture as a front projection screen. It is especially suitable for home or office use. Some projection screens will feel like they are in the way when you don't use them, but this kind of projection screen is on the furniture to avoid this problem. This projection screen can be lifted or lowered with the remote control.
In the 40-50 square meter home or living room, the projector is recommended to choose a brightness of more than 1000 lumens, and the screen should be more than 60 inches.
In a small conference room or standard classroom of 60-100 square meters, the projector is recommended to choose a brightness of 1500 lumens or more, and the screen should be more than 100 inches.
In the medium-sized conference rooms and lecture halls of 120-200 square meters, the projector is recommended to choose a brightness of more than 2000 lumens, and the screen should be more than 100 inches. The brightness of the projector is recommended to be between 2000-3000 lumens, and the screen corresponds to 120 inches to 150 inches.
In a large conference room or auditorium of 300 square meters, the projector should select professional engineering machines of 3000 lumens or more, and the curtains are all professional products of 200 inches or more.
When buying a new projection screen, be aware that the curtains on the market generally have the following quality defects:
Black spots - foreign objects that are attached to the surface of the screen and cannot be swept away so that light cannot be reflected.
The pit-projection is pressed against the surface to cause the screen cloth to be recessed.
Wrinkle - In the project, pay attention to the use of screen fabric to cause wrinkles on the screen fabric.
Color spots - foreign matter attached and other reasons, and caused to print on the screen fabric.
Line pattern - a line formed by the unevenness of the braided thread.
Dirty - due to the inadvertent attention in the project, the screen cloth is printed with fingerprints, oil stains and other dirty things.
Foreign objects - also known as lines - are attached to the surface of the screen fabric and cannot be removed.
Pinhole - A pin-like hole found on the back of a screen cloth under the illumination of a slide projector.
Scratch - Do not pay attention to the use of screen fabric in the project, but the front of the screen, scratched on the back.
The head of the line-white curtain area.
Bubbles - bubbles formed by the incorporation of foreign matter in the middle layer of the screen fabric
According to the quality of the products, the products can be divided into three grades A, B and C in general production. If these conditions exceed a certain limit, the product is a non-conforming product. These flaws have an effect on the projection effect.
Buying a suitable curtain, after installation, adjusting the projection environment is also an important part of achieving better image effects. Familiar with the features and functions of the projection screen to achieve the best results of the projection screen.
What is the brightness of the screen (Gain)?
Gain is an index of the reflectance of the screen. In general, the reflection amount of a white paper is 1Gain, and the mirror is 100Gain. The brightness of the projector is determined according to the size of the screen. Generally speaking, the brightness of the projector is based on 40′′, and once the screen is enlarged, the brightness is rapidly reduced according to the size of the screen.
Difference between reflective screen and retro-reflective screen
Glass bead The Roll/Rotary screen is a regression screen that reflects the image projected onto the screen. The brightness of the viewer's position directly affects the screen and thus blurs the image. If the projector is mounted on the ceiling, the projector's main light source will be reflected off the ceiling, resulting in a sharp drop in screen brightness. All Mocom high-brightness/high-quality resolution screens are reflective. The external light is directed to the outside, and the main light source of the projector is reflected in the direction of the viewer, thereby providing high-quality directivity, high luminance, and high-quality resolution.
Difference in particle size and resolution of screen surface
The glass bead screen is made of glass beads. The surface particle size of the glass sand screen is 150 μm to 75 μm, which is equivalent to the level of the simulated image. However, the Mocom high-luminance screen is a scattered line of 10 μm or less in the direction of the injection line, and the surface particle of the Mocom high-quality resolution screen is a high-precision surface particle of 5 μm or less, so it is the only one in the world that can achieve SXGA or higher. QXGA resolution screen
Color reproduction function
Regardless of how good the color reproduction function of the projector is, the screen must have a corresponding reproduction function to achieve the predetermined effect. The white screen is synthesized from the three original colors, so the natural color reproduction function is less than 33%. The reflective material AL used in the mirror is the best color reproduction function. The Mocom high-brightness screen and the Mocom high-quality resolution screen are made of AL reflective material, which achieves a 100% natural color reproduction rate.
Screen picture
The development process of the image screen is as follows
The fourth-generation concave screen described above is a picture with a three-dimensional perspective and the most realistic view. The Mocom high-quality resolution screen is the 3rd generation - the Mocom high-brightness screen is the 4th generation, providing the most realistic on-site stereo.
Screen comparison table | |||||
Screen type | General white screen | Glass sand | Real screen | Mocom high resolution screen | Mocom High brightness screen |
Brightness (Gain) | 0.9~1 | 1.5~3.2 | 0.9~5 | 6~10 | 18~24 |
Contrast accommodation function | 50:1 | 100:1 | 50:1 | 500:1 | 1000:1 |
Resolution level | Analog level | Analog level | Analog level | Digital | Digital |
Color accommodation function | 30% | 80~100% | 30% | 100% | 100% |
Screen characteristics | Scattered | Retroreflective shape | - | Reflective | Reflective |
Left and right viewing angle of the screen
The general screen image is not visible in bright places, but the Mocom high-brightness screen can achieve a 20-fold brightness image within 60° of the left and right. Therefore, a clear image can be presented without using a dark screen. An image that is twice as bright as a normal screen can be achieved within 100 degrees of the darkroom.
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