An LED video wall is only as good as the sum of its parts. Just one component can impact overall visual performance, and it’s important to spot the red flags. Here are a few of the items to consider when buying an LED display.
Do all pixels come from the same bin?
Because the creation process is so complex, it’s impossible to make identical pixels. The best manufacturers sort pixels by brightness and color. This process is called binning. Using pixels within a tightly controlled bin range, we can ensure a better quality display. Since all pixels are unique, it’s impossible to match them exactly—but choosing from a narrow range of color and brightness allows manufacturers to achieve a more uniform picture throughout the screen while maximizing power efficiency.
Are the surface-mounted-device (SMD) LED packages black?
Throughout an LED display, each pixel is held in place by an SMD package. For the deepest levels of black and highest contrast, these packages should be constructed with a dark encapsulation material, typically an epoxy resin. Be sure to ask for black SMD LEDs.
Where are the serviceability points?
The best designs allow for full access from the front, so tiles can be replaced and electronics can be repaired without deconstructing your installation. Most products will also require rear access for certain components. It’s important that you understand which components can be accessed, and from which side of the tile. The best products allow individual tiles to be replaced from the front of the LED video wall, without having to remove the entire cabinet, dramatically reducing service time and operational costs.
What type of certification does the display have?
When LED components are used together, their interactions can cause additional concerns, such as EMC emission levels that may not meet standards. Completing a system-level certification ensures that the entire system is safe and provides you with a peace of mind. If an LED product is purchased and installed without a system-level certification, a site certification may be required to complete your installation. Ask each potential vendor if site certifications are required, as these will increase installation costs and cause project delays.
Can we see the product in action?
Attending industry trade shows or requesting a live demonstration with multiple vendors will help you ensure top visual quality. Keep in mind, many vendors will offer their own content to maximize impact and minimize deficiencies. If possible, use a consistent package of visual images (and, preferably, video) to compare the vendors.
Make sure to choose content that is representative of your specific application. When viewing the images:
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Look for a uniform image across all modules
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Check for ghosting, ripping, or other anomalies
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Use a light meter to test brightness
With changing standards and wide range of product quality, understanding the available solutions will ensure you make the best choice. Christie offers a summary of The questions you must ask before buying an LED display (9 in total) that you may wish to refer to.
