Ultrathin aluminum LED display screen module

Ultrathin aluminum LED display screen module

SMD the big trend of outdoor led Display

outdoor SMD LED screen P6 P8 P10

outdoor SMD LED sign P6 P8 P10

outdoor SMD LED billboard P6 P8 P10

SMD the big trend of outdoor led Display

Nowadays, Many outdoor LED displays on the market are built using SMD technology—a trend that is now extending to the outdoor market. The SMD pixel consists of red, green, and blue diodes mounted in a single package, which is then mounted on the driver PC board. The individual diodes are smaller than a pinhead and are set very close together. The difference is that the maximum viewing distance is reduced by 25% from the discrete diode screen with the same resolution. 

outdoor use generally requires a LED display that is based on SMD technology and has a minimum brightness of 5000 candelas per square meter (cd/m2, sometimes informally called nits). This will usually be more than sufficient for corporate and retail applications, but under high ambient-brightness conditions, higher brightness may be required for visibility. Fashion and auto shows are two examples of high-brightness stage lighting that may require higher LED brightness. Conversely, when a screen may appear in a shot on a television studio set, the requirement will often be for lower brightness levels with lower color temperatures; common displays have a white point of 6500–9000 K, which is much bluer than the common lighting on a television production set.

Advertisements are designed to advertising LED display products. It has many advantages, LED display, convenient installation (mobile), less investment, information capacity for many advertisements (a), efficient, and any information can be displayed on the LED display ads, no matter where in the night, and good effect, the traditional view of cable screen cannot be compared. 

The LED display panel of advertising can change at any time. Led advertising display can display the 24 hours service different customers of different advertisements. All the LED display show information management and through LAN or Internet remote control PC control. To change a symbolic information, it just click with the mouse button to change, very convenient. Advertising LED display will also use for rent led display,rental led panel screen,and so on。

Our company Professional production outdoor SMD aluminum LED display,indoor led screen,sport led display,rental led panel,stage led signs,advertising LED display,move led panel,.We have built up special channels for the export business.Our market covers countries like U.S.A, England, Austria, Romania, Spain, Austria, Israel, Egypt, Germany, France and Turkey etc. Many companies keep a long term cooperation with us for the consultancy and the series projects. 

Outdoor LED display

Outdoor LED screen outdoor aluminum module LED sign display

DIP LED display is called as the traditional LED display while SMD LED display stands out in recent years, so we use DIP to distinguish latest SMD. Currently our company uses two main items, DIP346 and DIP546 which means specification and size of the chip.

346 is mainly used in high density LED display while 546 in large pixel pitch and high brightness. With the development of the technology, 346 can match the brightness and heat radiation effect so that The trend seems to replace 546 , gradually to become one item.

According to the usage mode, DIP LED display can be classified as outdoor DIP 3 lamp series, outdoor DIP 4 lamp series, DIP illuminance series and DIP back wall series

In contrast to new-born SMD LED display series, main advantages of DIP series are as follows,
1.As DIP LED display has experienced long term R&D and application, technology of DIP is mature, performance is stable and it is widely supported. Most of the complicated systems or complement measures are designed and manufactured on basis of DIP display standards, so DIP LED display is your conservative and reliable choice.
2.High brightness, DIP LED display adopts independent encapsulation, so when it is the same brightness, DIP has more heat radiation sheet metal than SMD so that design is in favor of chip heat radiation and high brightness. Meanwhile, DIP LED adopts V shape encapsulation, which can increase its performance of lighting focus so as to raise brightness and viewing distance. 
3. Better waterproof, DIP LED display is widely installed outdoor or semi-outdoor because of its high brightness and better waterproof effect and solutions

Evolution of Pixels: From Lamps to SMD LEDs

Evolution of Pixels: From Lamps to SMD LEDs

Electronic information signs and dynamic sound and lighting equipment served as prototypes for first digital screens. Initially they were all based on incandescent lamps. The main shortcoming of lamps was short lifespan – upto 500 hours. After 500 hours of continuous operation 50% of lamps could fail and needed replacement.

Working conditions on digital screens are the most unfavourable for lamps: a constant “on-off” mode. To extend the life of lamps a simple method was invented: to reduce the feeding voltage. Lamps now worked longer but another problem surfaced: with lower power the visible spectrum shifted into the red zone. One monochrome screens this could be easily disregarded but created grave problems for multicolor and full-color screens.

To turn a lamp screen into a multicolor installation was fairly easy: standard white lamps were either painted into red, green, blue and light-blue or placed behind color filters. Light filters absorbed a large part of light radiation and to keep the screen brightness it was necessary to place a reflector behind the lamp. The quality of colors, white balance and brightness of the screen fully depended on the quality of lightfilters and reflectors, their precise positioning. Naturally, such systems were complex in manufacturing and assembly, bulky and expensive.

Another serious shortcoming of incandescent lamps was their high power consumption. For example, typical screens with three inch pitch (76.2 mm) used lamps for auto industry 1250X (Uwork=13.5V, Icons=0.37А, lifespan 500 hours). One pixel contained 4 such lamps.

At 12V voltage one pixel consumed 16W, and one square meter of such screen consumed nearly 3kW of energy. Thus, a relatively small screen with 112x84 pixels and image area of 54.5 square meters turned into a powerful energy plant with maximum power consumption (white peak) of 165kW.

This had some peculiar effects: in winter the snow in front of the lamps screen melted and turned to rain, while in summer such screens overheated. A powerful ventilation or airconditioning system was needed to maintain normal operation of the screen. This increased power consumption even further (nearly 1/3 of the screen power consumption). Ventillation system required regular check-ups and cleaning. The costs of screen maintenance were thus astronomical.

In spite of high energy consumption, the total brightness on lamp screens was insufficient for daytime operation, about 2500 nits. To increase brightness by placing lamps closer together was impractical: any increase in resolution lead to increase in power consumption and significant problems with heat dissipation.

Another serious problem of lamp screens was a fire hazard. With high power consumption and high heat emission, high currents and powerful fans, plastic components and miles of cable – the probability of fire was tangible. Various fire prevention means led to lower screen reliability and higher production costs. At this stage in technological development, to turn digital lamp screens into massive and commercially attractive product was impossible.

Screen manufacturers were interested in LEDs as potential replacement of incandescent lamps. Initially, they started experimenting with monochrome or two-color displays by combining red and green LEDs. New light emitting elements allowed to significantly reduce power consumption, increase brightness and reliability.

First LED screens were created as a simple replacement of lamp screens. Structurally they were based on clusters widely used in information signs. A cluster is a unit that includes LEDs (in various combinations), frame (box) and connecting cables. This structure is convenient in maintenance and allows easy replacement of a failed cluster. Though manufacturers guaranteed long life of individual LEDs (50 000 hours, sometimes even 100 000 hours) in reality few manufacturers reached such excellent parameters. Among those few are Nichia, Toyoda Gosei, HP/Agilent, Cotco/Cree. Clusters were an intermediate stage, some other technological solution was needed.

The first high brightness blue LED was demonstrated by Shuji Nakamura of Nichia Corporation in 1990. By 1993 blue LEDs were mass produced and available for the market. Ten years later, in 2002, Nichia was a world leader in LED manufacturing and 60% of its production were blue LEDs. Prices stabilized and manufacture of full-color LED screens became viable.

First LED screens have relatively low resolution. Typical lamp pixels of 76.1 mm (3 inches) were replaced by LED pixel of 38.1 mm (1.5 inches). To maintain or even to increase the brightness (while maintaining the white balance) of the image area it was necessary to arrange a cluster of several LEDs, for instance, 4 red, 4 green, 2 blue. This pixel consumed about 1W, or 16 times less energy than a similar lamp pixel. Thus, a screen with 2 times higher resolution would provide a much better image and has 4 times lower power consumption. More actually, since ventilation system was no longer required.

Though a step ahead compared to lamp screens, LED screens based on clusters had some serious shortcomings: too many connectors reduced reliability of the system, large number of small components resulted in increased cost and longer assembly time.

The task of increased reliability and lower cost was solved by placing large number of LEDs in one module (64, 128, 256 and other options). Any failed component on a module (LED, passive component, or driver) required replacement of a whole module. This was especially true in relation to outdoor screens: modules had to be protected against rain and snow by compound that hermetically sealed the PCB.

As pixels were growing smaller and were placed tighter on a PCB, the composition of the pixels drastically changed: from a cluster of 7-12 LEDs to basic 2RGB-pixels (2 Red, 1 Green, 1 Blue), and later – to RGB.

The use of LEDs allowed to move away from a 12V systems (lamp screens) to 5V. This change also led to lower power consumption and better heat dissipation. 2RGB or RGB pixel consumed approximately 0.3W, the whole square meter of a screen based on a popular 19 mm pixel pitch consumed 839 W at the peak of white. A 6x4 meter screen with 320х240 resolution consumed only 20kW (a drastic reduction compared to lamp screens).

As the pixel grow physically smaller, it became smarter: developers of LED screens started using various brightness and resolution enhancement techniques. Our magazine published articles about virtual or dynamic pixel

At some point the miniaturization of pixel stopped due to technical bottleneck. Standard 5 mm oval DIP LEDs used to form an RGB pixel could not be placed tighter together: some free place on the board was needed for other electronic components and connectors. An intermediate solution was to use 3 mm LEDs but these later were rejected because of low stability.

All future hope to change LED pixel were concentrated on an SMD LED (surface-mounted). Once invented SMD LEDs were meant for indoor applications only, because humidity negatively affects their operation.

Different SMD LEDs were tested: single color LEDs, large and small sized LEDs. But the most promising option of 3-in-1 SMD LEDs became most popular. At present, the physical size of an SMD LED is limited by technological processes of surface-mounting machines to 4 mm.

One of the main shortcomings of SMD LEDs was bad contrast. Fully switched off SMD screen looks whitish because of the white background for LED chips. The efforts of developers were focused on solving the contrast problem – and finally the solution appeared in the market in the form of so called black face SMD.

Parallel to SMD, another indoor screen technology was developing - Dot Matrix. LED chips are arranged in 8x8 matrix: a minimalistic approach that offers economic solution. As with standard SMD LEDs the main shortcoming of Dot Matrix technology is the whitish background and poor contrast. While the white background serves as a reflector and increases the brightness of the screen, it leads to poor quality of image at low brightness levels.

Comparative tables of power consumption in the evolving pixel

4 Lamps Pixel	DIP LED cluster	DIP LED pixel	DIP LED pixel	SMD LED 3-in-1
RGBbrB	4R4G2B	2RGB	RGB	RGB	RGB
				1:1	1:4
16W	1W	0.4W	0.3W	0.3W	0.075W

As we see, in less than 20 years pixel changed and modified significantly. Obviously, this is not the end of the road; probably, only the beginning of the pixel story. But whatever the case, we have to know this story well.

Virtual pixel: Promotional trick or image improvement

Virtual pixel: Promotional trick or image improvement

Recently firms that sell large electronic LED screens, especially in southeastern Asia and in Russia, to advance their goods on the highly competitive market, started to declare that their screens use the technology of “virtual pixel”. They claim that “virtual pixel” doubles the actual resolution of screen, i.e. LED screen with the “usual” resolution 320x240 pixels in reality is converted into the LED screen with the “virtual” resolution of 640x480.

All world leaders in LED screen technology – Daktronics, Optotech, Barco, Lighthouse etc. - are concerned with creating new models with larger resolution in real physical pixels. In all their newest models these companies stopped using “virtual” pixels technology, although in previous models (3-4 years ago) “virtual pixel” was present. Why do leading developers and producers of LED screens reject “virtual pixel” technology?

Let us try to analyze this situation and to determine, where and when it makes sense to use technology of “virtual pixel” and is it true that “virtual” pixel' doubles the real resolution. Unfortunately, suppliers do not always provide real information on the use and functions of “virtual pixel”. They assure buyers that LED screen models with “virtual pixel” are not worse than similar models with real pixel.

In the majority of cases “virtual pixel” proves to be just a smart marketing trick. There is nothing new in this technology and small advantages are balanced by deficiencies which suppliers naturally prefer to hush up. Let us figure this out.

“Virtual pixel” of video screen “Virtual pixel” of video screen

Consider a video screen with pixels that contain of light sources positioned as a square (irrespective of the type: LEDs, incandescent lamps etc.). Each light source radiates light of a certain wavelength (or narrow range) or in laymen terms produces colored light. A picture Fig. 1 is an example of a typical pixel.

When image is displayed on a video screen in a “normal” mode (Fig. 2) each pixel of the original image corresponds to a certain pixel on a screen. For example, if a pixel in the top left corner of an initial image had R, G, B color, the pixel in the top left corner of the video screen will look the same. It is taken for granted that color elements in a pixel are well balanced in brightness and colors and no additional correction is needed.

In a “virtual pixel” mode each pixel of the initial image corresponds not to a screen pixel but to a light source, i.e. part of the pixel. The initial image has a doubled resolution so that each pixel of an image corresponds to each light source on a video screen. For example, four pixels of the top left corner of the initial image (Fig. 3) shall be reflected due to “virtual” transformation in a one screen pixel in a way shown (Fig. 4).

Thus, in a “virtual pixel” mode one screen pixel contains information on four pixels of the initial image. The image projected on a screen has doubled resolution in each dimension compared to a “physical” resolution of a video screen. This usually leads people to conclude that screen resolution also doubles. Which is not exactly true. In fact, one screen pixel cannot hold and display all information from the initial four pixels. Part of the information gets lost. The result may be the following.

Let’s say that the initial image (with resolution twice higher than “physical” screen pixel resolution) looks as a horizontal green line (one pixel thick) on a black background. If the line appears on an even row of pixels, the video screen will display a corresponding green line. But if the line shifts to an odd row of pixels, it will simply disappear: the video screen will remain black. In other words, smaller details and sharp color borders shall be displayed with distortions (artifacts) which are not evident in an initial image.

Are there any advantages of “virtual pixel” technology? Yes. In some cases the overall displayed quality maybe improved though image details will be distorted. This technology works better with smooth color gradients or on patchy images when color distortions are not evident. In a way, we can talk about doubling screen resolution only for black color because all light elements with black color look the same, i.e. they remain unlighted.

The above description relates to the simplified implementation of “virtual pixel” technology. This approach may be modified. Usually modification is made by displaying some averaged value. Averaging can be both spatial and temporal. With simple spatial averaging a certain algorithm will create a mean average of the initial four image pixels and transfer this information to the screen.

With simple temporal averaging one of the four pixels of the initial image will be displayed on a screen at higher frequency (double or quadrupled). Spatial and temporal approaches may be combined. However, until now there is no clear answer to a question of “optical equivalent”: how does the human eye perceive screen image based on above two approaches.

In practice screens with “virtual pixel” technology usually operate on “standard” mode, i.e. the virtual pixel option is switched off if the control system allows to do it. This is done to avoid color and image distortions that were not corrected during image adaptation by designers. When “virtual pixel” cannot be switched off, it is possible to minimize image distortions by introducing various filters (e.g. “blur”) that smooth out the picture, blur the details and remove distortions. But this may negatively reflect on the overall image clarity.

Conceptually, “virtual pixel” is an attempt to smooth out digital image (interpolation algorithms) as displayed on a screen. However, there are no universal interpolation algorithms: different types of images require different algorithms. As a result, application of a “virtual pixel” mode becomes inexpedient.

An alternative approach may be the following: initial images in double resolution must be adjusted to physical screen resolution by software that uses an interpolation algorithm specially selected for a given type of images. Usually, all standard designer tools have a large selection of such algorithms. This approach allows to get predictable results: that is, the screen will display exactly the same image as can be seen on a PC monitor without any additional artifacts. All of the above relates only to screens with the uniform distribution of pixels and LEDs around the screen surface.

In case LEDs are grouped together as clusters, other “virtual” algorithms can be applied but the initial image may require an even higher (e.g. tripled) resolution compared to the screen pixel resolution. Again, this will not mean that the screen resolution is tripled by “virtual” technology. Some special algorithms may be developed for other cases when LEDs are located not as a rectangular but as a triangle: RGB.

“Virtual pixel” technology is easy to misuse which results in the loss of even more information. Actually, “virtual pixel” technology on large screens appeared a long time ago. It was first adapted on lamp screens (made of bulbs) where it was called bulb-mode. Lamp screens had significantly lower resolution and significantly bigger pixel size. Naturally, developers tried to smooth the image edges to improve image quality. Later, same approach was expanded on LED screens.

铝质SMD LED户外显示屏产品优异性能

铝质SMD LED户外显示屏产品优异性能

★极低的死灯率：

    现有户外SMD显示屏高死灯率是SMD户外屏的普遍现象，本公司户外SMD显示屏可确保产品出厂无瞎灯，使用3000小时后瞎灯率低于万分之一（行业是万分之三）。

    ★具备可“浸泡式”的超强可靠防水效果：

    由于已有的户外SMD显示屏核心器件SMD组装显示模组时在防水工艺上很难做到有效防水，进而形成死灯，本公司户外SMD显示屏独有的多项防水技术可以做到“浸泡式”防水效果，并且在冬夏冷热反复冲击下不开裂，不渗水。

   ★铝质模组确保屏体表面经久不变形：

    SMD显示模组采用全铝结构工艺，可历经数年的冷热冲击及紫外线辐照不挠曲变形，这是已有户外SMD显示屏采用塑胶壳一两年后普遍变形所不能达到的优异效果,而且单个模组就具备可浸泡式防水能力.

   ★亮度高、光色一致性好：

    我公司户外SMD显示屏单点亮度差值＜5％，兰、绿波长偏差＜2nm，红光＜3nm，亮度衰减＜5％，长期波长漂移＜0.5nm，屏体色温、亮度数值稳定，无色斑、马赛克、麻点。

   ★具有六个面的散热功能使箱体温度电器系统工作更稳定：

    本公司显示屏箱体具有六个散热面，无需内置风扇强制散热。与同样规格屏在全亮时对比，我司无内置风扇箱体内部温度比具有风扇强制冷却的箱体还低10℃以上；在节能同时隔绝了有害气体对箱体内部电子元件的侵蚀，屏幕电气系统更能长久稳定运行。

   ★ 超薄箱体设计维护组装更简便：

1、轻薄设计：箱体最薄厚度是20mm，最大厚度是50mm，一平方米重量仅为28KG，是普通LED箱体重量的1/3（普通75KG/m2）；

2、 安装简便：1分钟内即可完成整屏中任意箱体的安装；

3、连接组件：独特连接设计，一插一拧1分钟即可完成安装，简单便捷，快速牢固；

4、高精度：铝质箱体采用精密模具制做，实现无缝对接，表面平整一致。

5、三大节省:省时：安装便捷省力：配有专用连接件，装卸方便，省钱：省去复杂钢结构件。

outstanding features of Aluminum LED Module

Aluminum LED Module

is a special LED module easily installed with mounting holes and 3M adhesive tape on the back of PCB for convenient mounting. It is made of aluminum housing with heat-resistant, corrosion-resisitant, impact-resistant and anti-aging. Compared with the general LED module, the outstanding features of Aluminum LED Module are as follows:
(1)energy efficient, major reduction in power costs;
(2)long lifetime;
(3)friendly enviorment;
(4)safe Application;
(5)low heat, high brightness, working well under harsh conditions;
(6)solid-state, high shock vibration resistant.