Frequently asked questions

18.1 What is an LED video wall?

An LED video wall is a direct-view display assembled from modules or cabinets containing light-emitting diodes. The cabinets form one coordinated pixel canvas without the conventional bezels found between tiled LCD panels.

18.2 Is an LED video wall the same as an LED television?

Usually not. An "LED television" normally uses an LCD panel with LED backlighting. A direct-view LED wall forms the visible image from red, green and blue LEDs at the front surface.

18.3 What is pixel pitch?

Pixel pitch is the centre-to-centre distance between adjacent pixels, normally measured in millimetres. A smaller pitch places more pixels in a given area and can support closer viewing, but it is not a complete measure of image quality.

18.4 What pixel pitch do I need?

It depends on minimum and typical viewing distance, content, acceptable visibility of pixel structure, camera use and budget. Review representative content on the proposed technology in similar lighting. Avoid relying on one universal distance formula.

18.5 Does a smaller pixel pitch always look better?

Not always. Once the pixel structure is sufficiently fine for the viewing distance and content, black level, contrast, colour, low-grey behaviour, processing and ambient light may have a greater effect. A smaller pitch can also increase cost, power density and component count.

18.6 How is LED display resolution calculated?

Divide the physical width and height in millimetres by the pixel pitch in millimetres. A 4,800 mm-wide P2.5 display is approximately 1,920 pixels wide. Cabinet dimensions may require the final size to be rounded to available module increments.

18.7 What does P1.5, P2.5 or P10 mean?

The letter P is shorthand for pixel pitch. P1.5 means approximately 1.5 mm between pixel centres; P10 means 10 mm.

18.8 What is a nit?

A nit is the commonly used name for one candela per square metre, a unit of luminance. Outdoor displays usually need much higher luminance than indoor screens, but correct operation may be below the product's maximum.

18.9 How bright should an indoor LED display be?

There is no single correct number. The target should suit ambient light, viewing distance, content and comfort. A boardroom or studio often benefits from a controllable range and good black level rather than very high peak output.

18.10 Can an LED display be seen in direct sunlight?

Purpose-designed outdoor displays can be visible in sunlight when luminance, contrast, orientation and surface treatment are appropriate. Site-specific sun angles and reflections should be assessed. Maximum brightness alone does not guarantee readability.

18.11 What is refresh rate?

Refresh rate describes how frequently the display updates pixel information. It affects visual stability and camera interaction, but source frame rate, PWM, scan ratio and processor timing also matter.

18.12 Why does an LED wall look banded on camera?

Bands can arise when camera exposure and sensor readout interact with display refresh, PWM or row scanning. The solution requires assessment of the complete camera-display timing chain; a higher advertised refresh rate is not always sufficient by itself.

18.13 What is scan ratio?

Scan ratio describes multiplexing of pixel rows. In a 1/16 scan design, groups of rows are driven in sequence rather than all rows being continuously active. The scan architecture influences brightness, current, refresh behaviour and camera performance.

18.14 What is SMD LED?

SMD means surface-mount device. Red, green and blue dies are commonly combined in a compact package mounted on the circuit board. SMD supports a wide range of indoor and outdoor pixel pitches.

18.15 What is COB LED?

COB means chip-on-board. Bare LED dies are mounted directly to a substrate and encapsulated as an integrated surface. COB can support fine pitch and improved surface protection, but products still differ in optics, service model and performance.

18.16 What is GOB LED?

GOB usually means glue-on-board: a protective coating or resin is applied over an LED module, commonly an SMD module. It is a surface-protection concept, not a single standardised display architecture.

18.17 What is MIP LED?

MIP generally means MicroLED-in-package. Very small LED dies are packaged into components that can be tested and assembled using package-level processes. Definitions and implementations vary by manufacturer.

18.18 What is MiniLED?

MiniLED may describe small LEDs used as zones in an LCD backlight or small emitters in a direct-view display. Always confirm the architecture rather than relying on the name.

18.19 What is MicroLED?

MicroLED uses microscopic inorganic LEDs as image emitters. It offers potential for high luminance, efficiency and fine pixel density, but manufacturing yield, transfer, uniformity and cost remain important challenges.

18.20 Are indoor and outdoor LED displays interchangeable?

Generally no. Outdoor products are engineered for higher luminance and environmental exposure, while indoor products may prioritise fine pitch, black level and close viewing. Some products serve semi-outdoor or protected environments, but suitability must be evidenced.

18.21 What does an IP rating mean?

An IP code classifies enclosure protection against access, solid objects and water under defined tests. It does not by itself cover every environmental risk or site interface, and front and rear ratings may differ.

18.22 How long does an LED display last?

There is no universal service life. Published hour figures often refer to a defined reduction in LED output under specified conditions. The complete display also contains power, control, mechanical and cooling components that age differently. Temperature, brightness, duty and maintenance influence useful life.

18.23 Does an LED display use a lot of electricity?

It can, particularly when large and bright. Use depends on screen area, luminance, content, duty cycle and system efficiency. Compare normal measured operation as well as maximum design load.

18.24 Can an LED wall show 4K content?

It can accept or display 4K content if the processing system supports it, but a native 4K pixel canvas requires 3,840 by 2,160 physical pixels. At P2.5, that is approximately 9.6 m by 5.4 m before allowing for cabinet increments. A lower-resolution wall can scale 4K input without becoming native 4K.

18.25 Can LED displays be curved?

Yes. Some cabinets support defined concave or convex angles, and flexible modules can create tighter forms. The proposed radius affects structure, seams, content mapping and viewing geometry.

18.26 What is a transparent LED display?

A transparent display leaves open area between emitters or uses a sparse structure so that light and sightlines can pass through. Greater transparency usually involves trade-offs in pixel density, fill factor or contrast.

18.27 What is an LED processor?

An LED processor prepares and maps source video for the display. It may scale, switch, crop, composite, colour-convert and synchronise content, while a controller distributes display-specific data.

18.28 What is calibration?

Calibration measures and corrects colour or luminance differences so that pixels, modules or cabinets match a target more closely. It is product-specific and should be managed by competent specialists. It cannot permanently hide physical damage or incompatible parts.

18.29 Why can LED modules vary in appearance?

Differences in production batch, optical construction, age and correction data can affect colour or luminance. This is a compatibility matter for professional assessment; the guide does not provide matching or replacement procedures.

18.30 Does this guide include LED module repair methods?

No. Module construction and repair boundaries vary between product families, and component-level methods are intentionally excluded. Assessment and any intervention should be handled through an appropriate professional support arrangement.

18.31 Does this guide diagnose dead or dark pixels?

No. A dead or dark pixel is a visible symptom with more than one possible cause. The guide does not map that symptom to tests, components or corrective actions.

18.32 Does this guide provide troubleshooting for a black or intermittent display?

No. The appearance alone does not establish a cause, and this guide provides no tests, resets, disassembly steps or configuration changes. The issue should be handled through the organisation's approved professional support route.

18.33 Does this guide explain how to clean an LED display?

No. Cleaning is product- and site-specific and can affect optical surfaces, environmental protection and electronics. This guide deliberately provides no cleaning method, product recommendation or schedule.

18.34 Can LED displays be left on continuously?

Some products are designed for 24/7 duty, but the complete installation, power, cooling, monitoring and support model must be suitable. Continuous operation increases accumulated hours and may justify redundancy and planned intervention.

18.35 What content format should be supplied?

Use the display's native pixel dimensions where practical, a supported codec or signal format, appropriate frame rate and the agreed colour range. For unusual canvases, use the provider's pixel map and safe-area template. Test the final file on the actual processing path.

18.36 Is HDR useful on an LED wall?

It can be, if the source, processor, display, black level and viewing environment support a controlled HDR workflow. High peak brightness alone does not create accurate HDR. Tone mapping and creative intent must be defined.

18.37 What information should be included in an LED display specification?

Include purpose, audience, viewing geometry, pixel canvas, pitch, luminance range, image-quality targets, content and source formats, environment, camera requirements, structure, power, data, access, redundancy, monitoring, documentation, support, spares and acceptance tests.

18.38 What warranty questions should a buyer ask?

Ask what is covered, for how long, where service occurs, who pays access and transport, what response is included, how pixel defects are treated, whether parts will visually match, and what actions may invalidate cover.

18.39 Is the cheapest LED display usually the lowest-cost option?

Not necessarily. Whole-life cost includes infrastructure, energy, content, access, downtime, spares, support and end-of-life treatment. A low initial price can be poor value if the product is unsuitable or unsupported.

18.40 What is the best LED display brand?

There is no universally best brand. Suitability depends on the specific product generation, application, evidence, processor, component quality, support model and integration. Compare proposed systems against the same requirements and test conditions.

18.41 Are LED video displays accessible?

They can support accessible communication when content has adequate contrast, text size and dwell time, avoids harmful flashing, and provides alternatives such as captions or audio where appropriate. A large image alone is not sufficient.

18.42 Do LED displays need planning permission?

Some outdoor or window-facing displays require planning permission or advertisement consent, and conditions may restrict luminance, motion and operating hours. Requirements are site- and jurisdiction-specific; consult the relevant authority.

18.43 Does this guide compare repair and refurbishment procedures?

No. The guide distinguishes the terms only at a general commercial level. It does not describe procedures, scopes of work, component choices or methods for either activity.

18.44 Can this guide determine when a display should be replaced?

No. Replacement is a case-specific commercial and technical decision. This guide provides no thresholds, decision tree or self-assessment method for reaching that decision.

18.45 What is the most important first step in an LED project?

Define the communication objective, audience, content and viewing environment. Those factors determine the useful specification more reliably than beginning with a preferred pitch or brand.