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LED display screen VS DLP joining together Both advantages and disadvantages of analysis

Release date:2017-04-07 11:21:59
LED display screen VS DLP joining together Both advantages and disadvantages of analysis

LED display screen VS DLP joining together Both advantages and disadvantages of analysis


LED display screen VS DLP joining together Both advantages and disadvantages of analysis

 

 

TV shows more and more rich and colorful, interactive stronger and stronger, to the audience the visual impact of also more and more big, the show played an important role in the background. In recent years, the LED display screen and DLP stitching gradually become the mainstream of programming background, this paper reviews the technical characteristics of two kinds of display screen, using effect, advantages and disadvantages, and matters needing attention, etc. To do some analysis and discussion.

 

A, LED display screen

 

LED is the abbreviation of LightEmittingDiode, Chinese meaning for light emitting diode, is a solid-state semiconductor devices, it can directly convert electrical energy into light energy. LED display is the advanced digital information product, it successfully combines the computer technology, network communication technology, image processing technology, embedded control technology, etc., has flexible display area and resolution (modular can be assembled freely), high brightness, low power consumption, long life, low quantity of heat, environmental protection, durable wait for an advantage, the integrated use of sound, light, electricity, figure and text, is comprehensive, perfectly show the information of end products.

 

LED display in the studio and television is increasingly used in large-scale activities, as a backdrop, it provides a variety of vivid, brilliant background images and more interactive features, make the background images also move also static, the performances and background together, let a person feel immersive. It brings stage more daydream space, design the modern and the stage of visual impact, perfect to live and show the atmosphere of the fuses in together, realize the other stage arts the function and effect of equipment is difficult to achieve.

 

The audience watch the effect and experience of LED display is very intuitive, as long as the screen size and pixel pitch and viewing distance, the appropriate type of this kind of direct display can obtain excellent results. However, the number of the front of the television audience is far greater than the number of audience, so the watch effect of the front of the television audience is TV technology workers are the focus of the study and discussion. Many units use the LED display, but the television picture is difference is very big, some bright colors, clear picture stable throughout; Have a plenty of vision when the picture look down upon, or when the close shot is the window of some of the activities, or erratic interference stripe, in some people close-up, often appear moire, disrupting the line of sight of the audience.

 

In the process of selection and use of the LED display should pay attention to the following aspects:

 

1. Point spacing should be as small as possible

 

Point spacing is LED display center distance between the adjacent pixels. Point spacing is smaller, the more pixels per unit area, the higher the resolution, the closer shot distance can, of course the price is more expensive. Use the LED display of the current domestic television studio spacing of 6 -- 8 mm, in order to achieve good effect, to seriously study the resolution of the signal source and the relationship between the pixel pitch, resolution should try to be consistent, to achieve a point-to-point display, so as to achieve the best effect.

 

2. The filling coefficient is higher

 

The filling coefficient of LED display (FillFactor) is known as the bright area ratio, namely the light emitting area of each pixel and the pixel of the surface area ratio of physics. LED display is composed of discrete pixel permutation, obvious light black between pixel area. When a closer look at the picture inconsistent incomplete, and uneven brightness produce particles move, if the light source is limited within the small pixel area, causing a single pixel brightness is several times the whole screen brightness and even more than ten times, can cause more serious sense of harsh. Flat panel display industry recognized TCO '99 standard regulation, filling coefficient should not be less than 50%, and the filling coefficient of many LED display on the market at present have not reached the target. TV cut-off characteristic of low pass filter is also directly affect the filling coefficient of different LED display appropriate shooting distance.

 

Same distance between the LED display, filling coefficient of more than filling coefficient of attenuation, so need to increase the shooting distance. If the system low pass filter passband is 4 MHZ, high frequency attenuation characteristics of 12 db/octave, so, filling coefficient of 25% shooting distance is more than 50% of filling coefficient of attenuation 1.15 db, shooting from the need to increase by about 10%. Filling coefficient increase, making display more broad perspective, melange effect is more ideal, to overcome the problem pixels of dazzling, and raise the whole screen brightness to the appropriate create conditions to have a better effect. Jiangsu entertainment chose filling coefficient is 60% of the LED display, it has a moderate soft brightness, uniform color, clear and exquisite performance, guarantees the high quality of the display screen.

 

3. Color temperature can adjust

 

Color temperature (ColorTemperature) is through the emitter emission spectrum shape with the best fitting compared to determine the temperature of the blackbody emission spectral shape. Studio using LED display screen as a background, the color temperature should be consistent with the studio light color temperature, can get the exact color reproduction in. The studio lights according to the program requirements, sometimes use 3200 k low colour temperature of lamps and lanterns, sometimes use high 5600 k color temperature of lamps and lanterns, LED display, need to adjust to the corresponding color temperature, to obtain satisfactory results.

 

4. The distance to the right

 

As we talk about point spacing and filling coefficient mentioned, different spacing, different filling coefficient of LED display, proper shooting distance is not the same. Was made the characters and the distance between the screen in the 4-10 m is more appropriate, so that when taking people can get a better background images. If the character off-screen too close, close shot in photography, the background will appear grain feeling, also easy to generate moire.

 

5. Ensure good use of the environment

 

Product in service life period only under the condition of appropriate work, low failure rate. LED display as an integration of electronic products, it is mainly composed of electronic components and other components of the control panel, switching power supply, light-emitting devices, and all of life and stability of these components has close relationship with temperature. If the actual working temperature exceeds the scope of the product, not only will shorten its life, the product itself can also severely damaged. In addition, the threat of dust also nots allow to ignore. Dust in the larger environment, work, because the PCB adsorption dust, the dust deposition affects the cooling of electronic components, components will cause temperature rise, and thermal stability decline and even produce leakage, serious when burned. Dust will also absorb the moisture and corrosion of electronic circuit, causing some short circuit problem is not easy to troubleshoot. We must keep the room clean. Studio transformation will produce a lot of dust, need to keep protection of LED display the work ahead of time.

 

Use the LED display display form of greatly enriched the program background, LED display screen as a background, is suitable for the large-scale variety show big scenes, the studio.

 

Second, DLP splicing screen

 

DLP is the abbreviation of DigitalLightProcessing, Chinese meaning for the digital light processing, the technology is first digitally processed the image signal, and then the light projection. From the principle of DLP technology, it has the least amount of signal to noise, precise grey scale, high reflectivity, seamless image display, high reliability and other advantages. DLP splicing screen by multiple display patchwork display unit, its main characteristic is small flat-fell seam, can control within 0.5 mm, everybody call it "seamless" joining together, this is also the other two technology of LCD and PDP. Television in recent years, due to these advantages, popular use DLP splicing screen as the background of the studio, CNN, BBC, SKY, CCTV and other famous television made a very good program after use effect.

 

DLP) has its drawbacks as well as stitching screen. Due to the DLP patchwork light source comes from the light bulbs, led to its power consumption is big, high heat, and use the brightness decreases after a period of time, the user must constantly change bulb to keep the original display effect. With the development of technology, thanks to the addition of LED light source, the current DLP splicing screen has solved the frequent replacement bulbs, large power consumption and high heat release a series of problems. DLP splicing screen after using the LED light source, not only on the service life and power to get a bigger breakthrough, also had a revolutionary change in color, let the DLP splicing screen to continue to maintain the market leading advantage.

 

In order to achieve satisfactory result of television, we in the selection of DLP splicing screen and use process should pay attention to the following aspects:

 

1. The splicing gap should be as small as possible

 

We hope the effect of background screen on TV is seamless, which requires patchwork gap to be small, to see in the lens aperture. At present, the use of titanium alloy needle stitching technology can make the splicing gap narrowed to within 0.2 mm, at the same time, by connecting plate design can ensure the screen when heat bilges cold shrink deformation, provides the entire screen with high quality image geometry and sharpness.

 

2. Higher uniformity

 

DLP splicing screen by multiple display patchwork, will cause the individual differences of each screen, and we want them to look like a big screen with matching color and brightness, this needs through technical means to improve the uniformity. At present this technology has been more mature, advanced technology manufacturers have been able to do the background run silently, without operator involvement, it through the integration of proprietary brightness and color sensor, continuously measuring the screen color and brightness of the wall and communication between the projection module, automatic matching all white, all black and all gray level between brightness and full color display module, and keep the whole display gray level is the same, so as to realize the multiple screen splicing images under long-term consistency.

 

3. The color temperature should be adjustable

 

And LED display, DLP splicing screen color temperature of the need to keep consistent with the studio light color temperature, to ensure the true image color reduction.

 

4. The studio lighting to control well

 

DLP splicing screen relative to other screens, brightness is lower, which requires good control of the studio lights, a light to avoid direct to the screen. After groping research, we use the cold light source with 20 ° grille lamps and lanterns, effectively will shoot to the glazing of the screen illumination control within 100 lux, and ensures the hosts had light intensity of illumination can reach 800-1000 lux, obtained satisfactory results.

 

5. The light source, high security are required

 

Live television interactive is more and more strong, the security requirement of the backgrounds is becoming more and more high, DLP splicing screen for a single screen size is larger, if the light source there is a problem, cause the black screen, for the show and even a single negative impact will be very big. So you need to use the double light hot backup or redundant LED as a light source module.

 

6. Ensure good heat dissipation, but also control the noise

 

UHP lamp and LED light source on the job will have a great quantity of heat, heat dissipation is the guarantee of life and an important part of the normal work, advanced surface technology can make higher cooling efficiency, less noise, but also pay attention to the environmental temperature to maintain good, also can't immediately cut off power supply when turned off, to make the cooling system to continue running for a period of time, making sufficient cooling and then cut off the power source, the light source have good protection effect, can have the best make it work.

 

DLP splicing screen is a revolution of the studio background, but because of it of light of the demand is higher, are not suitable for use in large-scale variety show, suitable for small and medium-sized do news, interviews, field wiring in the studio, weather forecast and other types of programs.

 

With the development of technology, there will be more new technology and new method applied to the studio background. We want to have a thorough understanding of their characteristics, in view of different conditions, the studio program form and requirements to choose technology products as a background, let these new technology to maximize their advantages and better service for programs and services for the audience.

 

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