Payment & Shipping Terms:
|Pixel Type:||3-in-1||LED Supplier:||Nationstar|
|Led Module:||240mm*240mm||Drive Method:||1/16scan|
|Cabinet Size:||640mm*640mm||Viewing Angle:||160/160 Degree|
Sourcing High Quality LED Screens P5 Indoor Led Advertising Board with High Quality LED Screen Chips
When you are looking for a high quality LED screen either here in Australia or sourcing from China there are a lot of different things to look out for, failing to do so can leave you with a poor quality screen with bad colors that fades quickly or fails often. This is a comprehensive guide to choosing a high quality LED display that is going to last the distance. Things we will be covering in this article are how to spot non-uniformity in LED screens, inbuilt features, how more brightness isn’t always better, frequency, compliancy, retaining colour at low brightness, pixel pitch and some of the methods used to ensure a good screen image.
High Quality LED Screen Chips
One of the most important things in a high quality LED screen is the LED chip used, things like the difference between virtual pixels and true pixels, DIP LEDs and SMD and the brand of chip all play a huge part in price and quality. I won’t be covering these in this article as I have already gone into great detail on our article All pixels aren’t created equal which I suggest you read in conjunction with this article.
LED Screen Pixel Pitch
Unless you are very new to LED screens pixel pitch will be words you’ve heard a lot. Pixel pitch affects price more than any other aspect and will determine if a screen is suitable for your application. What pixel pitch refers to is the distance between each pixel (each group of DIP LEDs or each single SMD LED). This affects price so much because if you had a P16 (16mm pixel pitch) and a P8 display at the same size you would require 4 times as many LED chips. Which pixel pitch you choose for your digital LED solution will depend on the distance between the LED screen and the person viewing it. A simple guide is for each 1mm pitch the minimum viewing distance is 750-1000. For example, a P16 screen shouldn’t be used in applications where the closest viewing will be less than 12m. That is a very basic guide and we will be adding a more comprehensive pixel pitch calculator on the site soon.
Non-uniformity in LED screens
When manufacturing LEDs the wavelength, which effects colour and the brightness vary. Small changes in wavelength and brightness can make a visibly differently colored light. There are several different processes that manufactures can do to help reduce and account for the difference in colour and for controlling brightness which I won’t detail here. The best way to tell if the screen has uniformity is to see it display all white and then green, blue and red. This is when the non-uniformities will be most obvious. The image gives you an idea of the difference this makes.
Brightness required for outdoor LED display
You might assume that more is better, this is not always the case. If you are considering an outdoor digital solution, a high quality LED screen should have a brightness 5500cd/m2 or more. This will give a LED screen vibrant colour in full light. LED Screens that advertising exceptionally high brightness are using this sales tactic. Running your LED display brighter than required will just reduce the lifespan of the LED chips.
Automatic brightness of LED screens
This can be a very beneficial feature. When there are lower surrounding light levels the screen doesn’t need to be running at full brightness. In fact, running at full brightness will actually make the screen harder to see and cause light pollution potential causing complaints. Having a screen that changes brightness will also reduce your energy consumption and extend the lifespan of the LED chips. If the LEDs are just dimmed this will affect the colour and the look of the screen, brightness should be reduce using PWM (Pulse Width Management) this flashes the LEDs on and off at full brightness faster than the eye can perceive dimming the display without losing the consistent vibrant colour. I would run the same testing mentioned in the Non-uniformity section of the article at low brightness to check they remain consistent.
LED Lifespan in screens
The lifetime will give you an idea of how often you are going to need to provide maintenance on screens. Longer is obviously better here. However, LED lifespan is based on luminous degeneration (LEDs dimming over time). This is shown as a percentage of the original brightness. The industry standard is 70% of the original brightness to be considered the end of the lifespan. However, different suppliers will use different percentages to bump up their perceived lifespan.
Meeting safety standards for digital solutions
Most countries have some sort of safety standards for electrical devices. You must make sure that they comply with all relevant standards. Importing screens that don’t comply with standards could leave you in a lot of trouble if an accident was ever to happen. If your manufacturer does adhere to common international standards like CE and RoHS it is a pretty good indicator that you should keep looking.
LED display colour depth
LED display colour depth refers to the number of colour that each pixel can display. This has to do with how the image is processed and the PWM frequency rather than the LED chip. 16 bit (65,536 colour) is a good amount, down to 14bit(16,384 colour) is still acceptable and anything more than 24 bit (True Colour) is not required. It is worth noting that each extra bit does make a big difference to the colour range. This mainly comes into play when you have large areas of solid colour with slight gradients or shadows. The image below shows you a small depth compared to a larger one. You should be able to see the banding in the top image.
Hardware self-monitoring in LED screens
Monitoring your LED displays is crucial to ensure constant operation and a long lifespan. Important metrics to monitor are component working status, temperature, and humidity. Monitoring smoke, fan status, power supply and that the cabinet door is closed can also prevent unnecessary faults. Some digital solutions provide an automatic shutdown feature to prevent hardware damage and most solutions will notify you when something is running outside normal range or when there is a fault.
Refresh rate for LED displays
The refresh rate is how quickly the image refreshes on the screen and is displayed in Hz. 60Hz means that an image is shown 60 times per second. This is important to reduce flickering and banding sometimes seen on older displays and CRT monitors. If you have ever tried to take a photo of an old monitor and there is a bright or dark band moving across the screen, this is because of a lower refresh rate. You will need a high refresh rate if you are planning on recording the display, in applications like sports stadiums that will be seen on television.
LED screen cabinet considerations
The LED chips aren’t the only thing you need to consider. The cabinet is also an important factor. The things you need to consider when it comes to the cabinet is access methods, weight, IP rating and mounting method. The mounting method affects the ease of install, some system will on be able to handle limited sizes, how easy the cabinets are to align should also be a consideration. The most common system for fixed LED screens (they are different systems for staging LED screens) is fixing points in the corners there is also a pin in the top to align and secure them to the screens above. This is a good system because it distributes the weight well. If you have a particular application in mind it might be worth weighing up the different systems you can find. Ocolour can help you come up with a high quality LED screen solution to suit your needs, contact us here for a consultation. It is pretty obvious why weight is important, anything over 40kg for a standard panel is getting excessive. Most fixed LED displays currently on the market offer a combination of front and rear access, rear access allows you to build a structure behind the screen for servicing. Alternatively, if access is easy, front access can allow you to great reduce fabrication costs by making a simple structure.
IP Rating for outdoor LED screens
Ocolour recommends an IP 65 front rating.
LED Display Power Supplies
The failure rate and lifespan of the LED power supplies (also referred to as LED drivers) is a lot faster than the LED chips. Cheap power supplies can be very inconsistent and fail quite quickly causing a section of your screen to go dark, if not the whole thing. Some good brands for LED drivers are Meanwell and TDK.
There is a lot to think about when purchasing a LED screen. The best solution is to talk to an expert. Going with an Chinese supplier ensures you get support and going with Ocolour ensure you get a high quality digital LED screen solution.
Indoor Led Advertising Board Series
|Module design||Back access or Front access with magnet|
|Module dimension(mm)||160 x 160||192 x 192||256 x 128||320 x 160|
|Module resolution(dot)||64 x 64||64 x 64||64 x 32||64 x 32|
|Driving mode||1/32 scan||1/32 can||1/16 scan||1/16 scan|
|There is die-cast cabinet,traditional cabinet and with bracket support for optional.|
|Viewing angle||Horizontal 120deg Vertical 120deg.|
|Power input||AC 110V /220V|
|Brightness control||256 levels|
|Blind spot rate||＜1/10000|
|Lifetime at 50% brightness||100,000 hours|
|Operation temperature||﹣30 ℃ ～﹢50 ℃|
|Storage temperature||﹣60 ℃ ～﹢80 ℃|
|Control way||Standard:Wired Optional:3G/4G/WIFI|
(with video processor)
|AV, S-Video, VGA, DVI, YPbPr, HDMI, SDI, HDSDI|