Sign & Digital Graphics

2013 Buyer's Guide

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monitors, wristwatches and electronic digital signage . LCDs contain two thin transparent surfaces (usually glass), with grooves full of a liquid crystal substance. Thin film transistors (TFTs) on the surface material apply an electric current to the liquid crystals. This current polarizes the crystals, making them twist and thus block light. When off, the liquid crystals go into random alignment and let light pass through. LCD Panel—A portable display unit that is placed on top of an overhead projector and connected to a computer so that the computer's display can be projected onto a large screen. Lead-in Wire—The wire that connects an electrode to the power source. LED (Light Emitting Diode)—A semiconductor diode that emits light when voltage is applied; a solid state lighting component, used in signage for EMCs,  channel letter illumination, edge lighting glass or acrylic panels or for various decorative lighting effects. LED Array UV Lamp—A special lighting system that uses a tightly packed array of light emitting diodes (LED) to produce high levels of ultraviolet (UV) light in order to cure UV-curable inks. Though not yet widely used in UV-curing inkjet printers, LED array technology offers low heat-emission, instant switching properties, long component life and high energy efficiency. evenly distributed tones capable of rendering detail throughout an image. Linear Scanner—A scanning device that uses a straight-line array CCD. The linear array captures one line of the image at a time as the CCD is moved over the entire image in steps. Line Screen—Used to define the density of the screen, similar to dots-per-inch. A 200-line screen has a pattern of 200 halftone dots per inch. As with DPI, the higher the number, the greater the detail within the reproduction. Linked Content—Content in digital signage that is referenced by a script, but is not sent as part of the script when that script is sent to content media players. Linked content can be updated at a separate time from normal script content or from an independent source. Location Based Advertising—The placement of advertisements near an actionable location. In other words, location based advertising deals with strategically placing messaging near where buyer behavior can be most immediately influenced, and converted into a sale. This most often applies in retail settings, such as shopping malls. Location Based Media—Refers to any public display media, such as signs, billboards and posters located out of home, usually near where the audience is near the point of purchase decision. Lenticular Image—An image that shows depth and/or motion as the viewing angle changes; produced by overlaying specially printed interlaced images with a plastic lenticular sheet which is molded to form a series of lenses that coincide with the different parts of the interlaced images. Lumen—A unit of measurement for light. The lumen is defined in relation to the candela as 1 lm = 1 cd•sr. As a full sphere has a solid angle of 4•π steradians, a light source that uniformly radiates one candela in all directions has a total luminous flux of 1 cd•4π sr = 4π ≈ 12.57 lumens. Letterheads—Loose-knit group of sign makers who seek to learn, share and pass on the techniques and craft of sign making. Luminance—Refers to the lightness or brightness of an image. Light Box—A slim cabinet with internal lighting, used to backlight translucent graphic displays. Luminescence—The quality of giving off light by the absorption of radiant energy. Used to describe any cold light. Light Magenta/Light Cyan—Muted or diluted forms of the two primary colors. When added to regular  CMYK, these shades provide for greater variety in printed dot color for more natural-looking continuous tone prints. Luminous Tube—A neon or fluorescent tube, consisting of a sealed gas-filled glass vacuum tube with an electrode at each end containing a specific gas. As an electrical current is passed between the electrodes, the gas is ionized and emits light. Light Reflectance Value—The amount of light reflected by a given color. For instance, yellow has a higher light reflectance value than purple. Abbreviated as LRV. LUT (Look Up Table)—Pre-set measurements and adjustments for different media, file types, printers, etc.; stored to ease imaging and printing operations. Sometimes included as part of a total RIP solution. M Magnetic Sheeting—Magnetized strip laminated to a flexible plastic sheet and sold in rolls. Magnetic Core—A material that can couple changing magnetic fields in a transformer. For AC line frequency transformers, they are most often made of thin pieces of silicon steel stacked to the needed height. For high frequency transformers the core is usually made of ferrite. A material often made from manganese-zinc or manganese nickel alloy. Mahl Stick—A baton-like piece of wood with a knob at one end to provide extra support for a painter's brush hand. Manifold—In  neon tube processing, a system of vacuum tight tubing arranged so that attached tubes can be evacuated with a vacuum system and filled with rare gases. Marquee—In computer graphics, the process of using a mouse-driven cursor to draw a rectangle around an on-screen object, therefore selecting it for further work. Sometimes called highlighting in software packages. In architectural sign-making a marquee is a projecting structure permanently attached to, but not a part of the roof. Masking—In painting or screen printing, the process of covering—usually with tape or paper—areas to protect them from receiving subsequent layers of paint or ink. Matrix—The number and amount of lighting units in the display area of a changeable message sign. MCI (Media Control Interface)—The standard method of controlling multimedia devices before DirectShow/Windows 95. It is a standard for communicating with devices that support VCRlike operations like play, pause, stop, etc., such as  MPEG playback cards. A given device might offer both MCI and DirectShow drivers. MDO (Medium-Density Overlay)—An exterior-grade plywood with an average veneer on both sides. Media Player—In electronic digital signage, an audio-visual component used to feed content to a television, LED or flat panel display for an electronic digital signage system. Also called "multimedia player." Linearization—The process of calibrating the tone values of a scanner or digital printer to create S I G N & D I G I TA L G R A P H I C S • SBGuide.indd 111 Mid-June 2013 • 111 5/31/13 12:36 PM

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