What is Media Facade?
Lighting is a necessity not a luxury of is it? There are lots of debates for it. For Road Lighting it is necessetiy but for architectural lighting design and/or as media facade. Maybe, the right thing is to clarify what are our exact needs? It isn’t too complicated to understand. Just by looking ourself we can understand what is our need or not! Some of us pay for luxury stuff, some pay for humanbeing necessities. We pay for cars, bikes, eat, meet… etc. What is valuable? We think that its not that compicated. If we live in a society or in a livable cities, even if its not a must for us – we need to make our region more social, livable. Due this reason, we pay money for building to add a personality to them. With this aspect, media facade systems born in undustries.
What is Creative Led Display (media facade with LEDs)?
LED display market is splitted in two categories, panel displays and creative displays. With “panel display” we mean the rectangular hi-resolution panels, mainly used in stadiums and advertising. With “Creative display” we mean lower resolution in any kind of shape/freeform , screen ratio, etc. Beginning of the market LED screens that are not initially meant for advertising, but for communication or creating a landmark. Integrated in the architecture, following contours of a building. Because a lot of people associates the word “display” with a high resolution screen. That’s why, when integrated in a façade, we prefer it to call a creative media façade. The purpose is to communicate, attract, interact and surprise instead of showing High resolution video. Which doesn’t mean that in specific application this is not possible to do. High resolution panel displays are normally installed in smaller area’s with a regular screen ratio like 4:3 or 16:9, where creative display’s or facades are covering bigger area’s in any shape for larger viewing distances.
Creative media facades are more and more integrated in the architecture. Architects are now involved in the process, where we in the past, when providing the high res panels, we installed this afterwards when the building was completed. Architects normally hated this because it was affecting there design. Now architects are involved, materials, look and feel, the way of installation and the way of integration with there building materials became more important. Next to this we see that transparency is common a requirement, That’s why we offer different solutions to mount our products, but a lot of project customization for carriers are created by our partners. Also bigger pixel pitches are becoming popular , this requires a higher output because next to the bigger pixel pitch also daylight view is a common request.
What is Matrix Systems? (Media Facade Solutions)
Matrix systems are generally used for media facade display purposes and how to close to problems.
Selection criteria of Media Facade:
• What is the required viewing distance: choice of pixel pitch?
• How big is the application area: size and number of modules?
• What is the required resolution: choice of pixel pitch?
• Are there transparency concerns: choice of pixel pitch?
• Monochromatic or RGB?
• Customized solution necessary?
• What is the required brightness?
• Information about the graphic content: live feed, custom created etc.
• Are there any mounting limitations?
You will find the answers of the questions given below. Hope you to enjoy the post!
How Does RGB Colour Mixing Work in Media Facade?
RGB colour mixing is an additive process: optically combining the output of red, green and blue coloured-lamps or LEDs to create the desired colour. A typical control system can vary the intensity of each of the three channels in steps of 1/255th of full-brightness, leading to 255 red x 255 blue x 255 green combinations, or a spectrum of 16.5 million possible colours.
What is DMX?
DMX (Digital MultipleX) is a lighting control protocol, originating from the entertainment industry, which is capable of transmitting the levels of up to 512 channels very rapidly, updating many times per second. The DMX control protocol is digital, which means that it sends the level-values for each channel as a stream of binary data using a single balanced cable. As such it is ideal for controlling arrays of colour-changing luminaires, where a luminaire may typically require three channels of control at a time: one for the RED level, one for the GREEN level and one for the BLUE level. Therefore to instruct a luminaire to emit purple light, for example, the red and blue channels would be set to a high level whilst the green channel would be instructed to be at zero brightness
The DMX signal is used for controlling a driver, and is not directly connected to the actual LEDs themselves because it is not a power signal. Regulated power for the LEDS (or other lamp types) is provided by the driver or control gear, which may be built into a luminaire or which may be remote. DMX is wired in a daisy-chain topology, of up to 300m long with the “far end” terminated by connecting a 120R resistor between the + and – data conductors. There can be upto 32 “unit loads” connected to the DMX bus, where a typical luminaire has a unit load of “one”. For longer runs, or more luminaires, DMX repeaters/splitters or signal amplifiers are required. Some products, such as the Floodline RGB from Sylvania have a lower unit load, enabling longer chains of luminaires.
What is illuminance and luminance:
Luminance: The luminance of a surface is the luminous intensity emitted per unit projected area of the surface in a given direction. The unit of measurement of luminance is the candela/m2(nits). Luminance is widely used to define stimuli presented to the visual system.Usually we don’t need lux level when we talked about Media Facade.
Illuminance: Illuminance is the luminous flux falling on unit area of a surface. The unit of measurement of illuminance is the lumen/m2 or lux. The illuminance incident on a surface is the most widely used electric lighting design criterion. Illumimance terms and symbols are core of Media Facade Systems.
Brightness: Amount of nodes per m2(metersquare) x brightness per node.
For indoor use, between 1000 to 3000 Nits will be sufficient. For outdoor, 3500 Nits or more is needed. A screen applied in direct sunlight requires a 5000 Nit brightness. Before calculating a screen we advise to review the environment of the application to determine the brightness of the screen of Media Facade.
Importance of Contrast in Media Facade: Contrast level and the meterial of objects are important for Media FacadeWe use contrast to make an object distinguishable from other objects and the background. This is why we usually use black background in LED screens and Creative Media Facade solutions. Black color absorbs the light and give less reflects. Under sunshine, white backgrounds loses the contrast to recognize image/video. Matt black surfaces as a background give much better results for direct view solutions, than glossy shiny surfaces. To increase contrast, North facades are choosen cause they give better results in contrast.
Resolution: Number of pixels are used for display of Media Facade.
We need 120 lines minimum to describe video content, 32 lines for animations, 20 lines for logo show up, 10 lines for Text description. Below 160 lines image quality is content depending
Pixel pitch / node spacing : Refers for distance between the centers of adjacent pixels.(milimeter)
Viewing Distance for Calculations of Media Facade:
Defining pixel pitch depends on your architecture, required nits, viewing distance…etc. We usually need minimum viewing distance to define the minimum length to close to screen. After this distance you will lose the perception of image.
Calculating the minimum viewing distance o your Media Facade you need to define your pxl pitch:
Pixel pitch •1 in meters
screen height •2
Optimum viewing distance is the optimal recommended viewing distance for Media Facade:
Pixel pitch • 2 in meters
Maximum recommended viewing distance of Media Facade:
Screen height • 20
Maximum viewing distance of Media Facade:
Screen height • 50
Most known Media Facade Firms in Market: