LED display LED screen led panel Blog

A big arc LED display has been installed out of the Shoping city Hangzhou Building in Hangzhou China.

This display is the biggest outdoor fullcolor LED display in hangzhou city. It’s a P12 2R1G1B arc LED display, with 7.68M perimeter and 21.12M height. The cabinet size is 768*960MM, means the biggest LED display is made by 11 cabinet width and 22 cabinet height.

This LED display will used for outdoor advertisement,as it’s so tall and so brightness ,making the building to be a now landmark of the city.

Silan is a leader in the solid-state lighting industry in the brightness and efficiency of LEDs. You can find Silan LEDs in a wide range of applications, including:

Digital camera flash
Full-motion video signs
Automotive dashboard lighting
Traffic signals
Cellular phone backlighting

Silan’s advantage is in the materials used. Silan LEDs combine highly brightness efficient and pure color,so it can be good behave in LED show.The Silan Chips also have long life and Super-bright light from little power.

In Chipshow most our customer Choice the Silan’s Chips as good cost performance.And in our 10 years use processes, Silan Chips give our a good effection and value for our customer.

A diode is the simplest sort of semiconductor device. Broadly speaking, a semiconductor is a material with a varying ability to conduct electrical current. Most semiconductors are made of a poor conductor that has had impurities (atoms of another material) added to it. The process of adding impurities is called doping.

In the case of LEDs, the conductor material is typically aluminum-gallium-arsenide (AlGaAs). In pure aluminum-gallium-arsenide, all of the atoms bond perfectly to their neighbors, leaving no free electrons (negatively-charged particles) to conduct electric current. In doped material, additional atoms change the balance, either adding free electrons or creating holes where electrons can go. Either of these additions make the material more conductive.

A semiconductor with extra electrons is called N-type material, since it has extra negatively-charged particles. In N-type material, free electrons move from a negatively-charged area to a positively charged area.

A semiconductor with extra holes is called P-type material, since it effectively has extra positively-charged particles. Electrons can jump from hole to hole, moving from a negatively-charged area to a positively-charged area. As a result, the holes themselves appear to move from a positively-charged area to a negatively-charged area.

A diode comprises a section of N-type material bonded to a section of P-type material, with electrodes on each end. This arrangement conducts electricity in only one direction. When no voltage is applied to the diode, electrons from the N-type material fill holes from the P-type material along the junction between the layers, forming a depletion zone. In a depletion zone, the semiconductor material is returned to its original insulating state — all of the holes are filled, so there are no free electrons or empty spaces for electrons, and charge can’t flow.

At the junction, free electrons from the N-type material fill holes from the P-type material. This creates an insulating layer in the middle of the diode called the depletion zone.

To get rid of the depletion zone, you have to get electrons moving from the N-type area to the P-type area and holes moving in the reverse direction. To do this, you connect the N-type side of the diode to the negative end of a circuit and the P-type side to the positive end. The free electrons in the N-type material are repelled by the negative electrode and drawn to the positive electrode. The holes in the P-type material move the other way. When the voltage difference between the electrodes is high enough, the electrons in the depletion zone are boosted out of their holes and begin moving freely again. The depletion zone disappears, and charge moves across the diode.
When the negative end of the circuit is hooked up to the N-type layer and the positive end is hooked up to P-type layer, electrons and holes start moving and the depletion zone disappears.

If you try to run current the other way, with the P-type side connected to the negative end of the circuit and the N-type side connected to the positive end, current will not flow. The negative electrons in the N-type material are attracted to the positive electrode. The positive holes in the P-type material are attracted to the negative electrode. No current flows across the junction because the holes and the electrons are each moving in the wrong direction. The depletion zone increases. (See How Semiconductors Work for more information on the entire process.)

When the positive end of the circuit is hooked up to the N-type layer and the negative end is hooked up to the P-type layer, free electrons collect on one end of the diode and holes collect on the other. The depletion zone gets bigger.

The interaction between electrons and holes in this setup has an interesting side effect — it generates light! In the next section, we’ll find out exactly why this is.

Copy From:http://electronics.howstuffworks.com

This amazing lighting is the 3D LED Display. It builds with 25,000 lightballs, each lightball containing 12 LED. It can display 16 million colors and 25 images per second.(Wow!). It developed by the Swiss Federal Institute of Technology Zurich for their 150th anniversary. It is 5 by 5 by 1 meter and it is 3.3 tons. If you go to Zurich, you can see it in the train station’s main hall, and it will be there till September 2009.(a very cool lighting!) Check out see more pictures.

LED video wall displays give you the power to communicate, to motivate, and to entertain. LED video wall displays are seen to be sited for outdoor advertising, in casinos, for events like sporting events in stadium and arena, for staging and mobile display etc.

This larger dynamic range helps Act One displays show more details on dark scenes, and smoother, more brilliant colors for all videos and pictures.

SMD lighting Technology the leading manufacturer of LED video wall displays has proven itself in distribution of LED video wall displays with solely providing high brightness output to ensure high visibility for outdoor video displays which is very critical issue.

The horizontal viewing angle of video displays is up to 150 degrees in the daytime, and up to 170 degrees in the night time. It means with displays, you will be able to reach more viewers and broadcast your information more efficiently.

The display systems come with user-friendly software to perform remote control and management. With the software, you can remotely monitor the status of the display, as well as upload and schedule files to show.

Features
SMD LED Packages:
Red, Green and Blue light blends within a single package to reduce the necessary viewing distance.
High Brightness:
User-controlled intensity of up to 2,000 nits overcomes harsh indoor lighting environments.
Advanced Video Processing:
12-bit LED image processing produces a crystal-clear picture with true-to-life color reproduction.
LED HD Ready:
Aspect ratio independent and compatible with both standard and high-definition image feeds.
Any Shape, Any Size:
Module-based design allows for unique shapes and aspect ratios while eliminating all limitations on display size.

LED fullcolor display are amazing with it’s bright enough to see in broad daylight;stand up to severe weather conditions and pwoer less. But as two sides of a coin, LED have her biggest disadvantage—-Uniformity of Luminance and Color.

The root cause of luminance and color uniformity problems in LED screens is the LEDs themselves. Modern manufacturing processes for LEDs produce LEDs that vary greatly in both brightness and color. For example, when you apply the same electrical current to two green LEDs produced as part of the same batch, the brightness may vary by as much as 50% and the wavelength may vary by as much as 15-20 nanometers. These differences are very noticeable and LEDs that vary by this much should not be used in the same video screen.

By contrast, televisions, which rely on phosphors to produce brightness and color, do not have this problem. The phosphors in each pixel produce nearly the same brightness and color when hit with the same amount of energy from the cathode ray gun. Since the pixel response in CRT devices is very repeatable, the uniformity of CRTs is very high. (See the first line of pixels in Figure 1 below.)

LED screens, however, have two problems as mentioned above. First, the brightness of each LED varies widely even though they are driven by the same voltage and current. (See the second line of pixels in Figure 1, where the brightness of each LED is represented by different size dots.) Second, the colors of the LEDs are also quite variable. (See line 3.) When you add these two problems together (See line 4), you can see why achieving uniformity in a LED screen is so difficult. Imagine viewing a TV where the phosphor dots are different sizes and different colors. It would not be a pretty sight, just like some LED screens you may have seen.

Another cause of non-uniformity in LED screens is that the LEDs get slightly dimmer as they are used (see Figure 2). The blue LEDs dim the most and the red LEDs dim the least, but the biggest problem is that individual LEDs dim differently over time. So, even if an LED screen were perfectly uniform when it left the factory, it would loses its uniformity as the LEDs dim, and after about 2 years of usage it would begin to look quite non-uniform.

Because of technology of LED chip or chip’s encapsulation, and some time as cover and lamps site, every lamps every modules color and brightness will have some differ, also because of used about a period of time, every colors lamps have different rate of attenuation, also will destroy LED screen’s color and lighteness uniformity.

So with a method to correction every module every dot after finished pixels is necessary. Ours latest Pixel by Pixel Correction Technology (PPCT) make it very well. Before a cabinet we correction every modules to make sure uniformity, every cabinet adjust, and after aging 3 days the last correction in factory.

After used a period of time or replacing some part of LED display, Pixel by Pixel Correction Technology (PPCT) also can give you stately uniformity.

Before correction

After cottection

Lastest weekend we have a wonderful travel in Qingyuan.Now We publish it all,wish can share our enjoyment with you.
Qingyuan is famous for its tourist attractions. These includes Five-stars drift, Feilai Temple, Yinzhan Hot Spring Area, and the indigenous custom.

Ours Travel Path

Beside North river

In Bijiashan Park

All of us.

Macao is the world’s premiere entertainment destinations and Chipshow is proud to be part of the visual landscape that adds excitement to the famous hotels and gaming facilities around the world.

Ours video systems can be used for entertainment and advertising purposes in outdoor applications and as exciting additions to indoor environments. The F series of electronic display systems can attract attention, disseminate information, give direction and advertise events with high definition color and eye-catching graphics.