|Product Name:||Indoor P3.91 Led Display||Pixel Pitch:||3.91mm|
|Pixel Configuration:||1RGB||Pixel Density:||65,536 Dots/m2|
|LED Chip:||Epistar||LED Lights:||SMD 2121|
|Cabinet Size:||500mm*500mm||Cabinet Resolution:||128*128|
|Screen Dimension:||Customized||Tube Chip Color:||FULL COLOR|
|Usage:||Indoor||Display Function:||Video, Animation, Graphics|
|Pixels:||3.91mm||Selling Units:||Single Item|
|Single Package Size :||50X50X9 Cm||Single Gross Weight:||7.4 Kg|
|Package Type:||1. Flightcase Carton 2. Polywood Carton 3. Honeycomb Cartoon|
pole led display,
roadside led display
SMD 2121 P3.91 Led Screen / Outdoor Led Digital Display With Pure Black Leds
√ High precision die casting aluminum material cabinet, special design on cabinet bottom ensures flatness of whole screen even the platform is not flat. Also can protect modules in screen bottom. Front and back maintenance design by module magnet assembly.
√ 250mmx250mm module, compatible P2.98, P3.91, P4.81, P5.95, P6.25, high contrast, high gray scale.
√ PWM driving IC, refresh >3840Hz, ensures true 16bit gray level.
√ High-performance PCB board substrate with strict technology process ensure perfect flatness performance, showing the most real and brilliant colors.
√ Optional LCD panel design on cabinet back can show company name, LOGO, temperature, humidity, working voltage, cumulative operation time etc.
Shenzhen Longrun LED Optelectronic CO.,LTD, a professional LED display manufacturer engaging in R&D, manufacture and sales,which started its business since 2009. Its factories locate in Huazhan Science & Technology Industrial Park, West Shangxin Industrial Park, which are neotype high standard industrial parks in Baoan, Shenzhen. Two production bases are conjunct with each other, cover an area of 12000 square meters, total register capital reach 10 million RMB. Being one of the domestic leading suppliers inLED product application and solution, Longrun has separate purification plant, R&D base, and the industry’s most advanced automated production and testing equipment. It dedicates in providing terminal clients with LED applications of high quality and performance and also with the most effective service.
|Q: What is the brightness, viewing angle and wavelength of the LED?|
|A: Luminous Intensity is equal to the amount of luminous flux emitted into a very small solid angle at a defined angular orientation from the light source. The measurement for luminous intensity is the candela. Symbol is Iv.
Viewing Angle is the total cone angle in degrees encompassing the central, high luminous intensity portion of the LED beam from the on-axis peak to the off-axis point where the LED intensity is 50% of the on-axis intensity. This off-axis point is known as theta one-half ( 1/2). Two times 1/2 is the LEDs' full viewing angle; however, light is visible beyond the1/2 point.
Wavelength is the distance between two points of corresponding phase and is equal to waveform velocity divided by frequency. It defines what color human eyes could recognize
|Q: What is dominant wavelength? Please specify the ranges of wavelength in red, green and blue color respectively.|
|A: Dominant wavelength is defined as the best range of wavelength showing the most natural color recognized by human eyes. Researches indicate that fixed colors with wavelength of 620-630nm (red), 520-530nm (green) and 460-470nm (blue), in fact mixed in a particular proportion, can get the pure white. That is, in display field, people use luminous materials with above wavelength to make "compounded" white more natural.In order to get a good balance white led display, we specify the led colors with wavelength within 4nm for each color|
|Q: Which chip vendors are you buying from?|
|A: It depends on the Customer's requirement. We can purchase from Japan, Korea, Europe, USA. We are using chips mainly from Taiwan|
|Q: What is the chip size you're using for outdoor display? How about indoor display?|
|A: For outdoor display, we're using 12mil chip for red, 14mil for both green and blue. Regarding indoor display, 9mil for red, 12mil for green and blue are currently adopted|
|Q: How much will the brightness of LED drop down after 1000hrs?|
|A: Based on the result of aging test, the brightness decay of green LED is around 5%-8%, while blue is around 10%-14% and red is around 5%-8%|