LCD Advertising Player Glossary
Analog Use dials or twist-turn knobs to alter settings, such as brightness or contrast. These settings cannot be saved for future recall but are ideal for quick access to certain functions that users like to change frequently. Analog to Digital Conversion LCD monitors with an analog interface can accept an analog video signal using standard RGB connectors for personal computers, in the same way as a CRT monitor. The analog signal is then converted into the digital signal used for display on a LCD panel. LCD monitors with only a digital interface require a dedicated graphics adapter and connectors, which come in varied formats. A/D Converter (Analog/Digital converter) A device that converts continuously varying analog signals from instruments that monitor such conditions as movement, temperature, sound, etc., into binary code for the computer. It may be contained on a single chip or can be one circuit within a chip. ANSI-HFS (American National Standard for Human Factors Engineering of Visual Display Terminal Workstations). Organization that produces publications concerning the ergonomics of monitors. Anti-glare Filter A treated glass panel that is placed over a monitor screen to reduce glare. Anti-glare Screen A monitor screen that is treated to reduce glare from light sources. Non-glare CRTs often use a coating baked onto the screen at the time of manufacture, which provides a significant reduction in glare; however, LCD screens may completely eliminate it. Aspect Ratio The ratio of the width of the picture to the height. For most current monitors, this ratio is 4:3. For HDTV, the ratio will be 16:9 or 16:10. Asset Control Saves the time of manually tracking monitors across the network. Allows the retrieval of key asset-tracking information, such as monitor make, model, and serial number, when the monitor is used with a Compaq PC supporting Intelligent Manageability and appropriate network software. This information is especially useful for network administrators. Auto Adjust A special one-touch Auto Adjust button allows users to quickly set the display panel to match their preferences and provides users with excellent front-of-screen performance and minimal set up. Auto Sync Same as Auto Adjust. Top Backlit An LCD screen that has its own light source from the back of the screen, making the background brighter and characters appear sharper. The speed, measured in megahertz, at which the data can be accepted from the CPU/graphics adapter to the monitor. A greater speed means that higher resolutions can be shown with more brightness and clarity. Brightness The light level on a display screen. Color Temperature Defines the whiteness of the white on the screen. Variations are measured in degrees Kelvin. Natural colors used in life-like images, such as people or landscapes, look more true to life when displayed at a color temperature of 6500K. Black text on a white page is better represented by a color temperature of 9300K. Color Matching Color matching refers to the process of accurate duplication of colors between the display and either input (like a VGA card) or output (like a printer). An LCD display with color matching stores color-related parameters in special memory called EEPROM, and uses this data for optimization, providing benefits such as WYSIWYG printing and faithful representation of Web graphics. Top Contrast The difference between the lightest and darkest areas on a display screen DDC (Used by Plug and Play monitors) Short for Display Data Channel, a VESA standard for communication between a monitor and a video adapter. Using DDC, a monitor can inform the video card about its properties, such as maximum resolution and color depth. The video card can then use this information to ensure that the user is presented with valid options for configuring the display. DDC1 Display Data Channel 1. A uni-directional data channel from the display to the host, continuously transmitting Extended Display Indentification, EDID information. DDC2 Display Data Channel 2. A bi-directional data channel based on the 12C protocol. The host can request EDID or VDIF information over the DDC2 channel. In addition to this, the DDc2 channel can act as a transparent channel for ACCESS.bus communication. Top Display Modes Specific frequencies at which the monitor (and/or computer) can display text or graphical information. Most monitors today support several frequencies. This is called multifrequency or multi-scanning, and it ensures that the monitor will perform with a variety of computers and applications. Dithering and Display Colors TFT LCD panels support either 6-bit or 8-bit RGB color output, allowing them to display 262K or 16.7M distinct colors, respectively. Using so-called dithering techniques, an analog-to-digital signal processor can simulate 8-bit RGB color output on an LCD panel that actually supports only 6-bit color. Dot Pitch A measurement of distance between the centers of two same-color phosphor dots on the screen. The closer the dots, the smaller the dot pitch, and the sharper the image. Top DVI (Digital Visual Interface) A digital flat panel interface from the Digital Display Working Group (www.ddwg.org). The DDWG was formed to create a universal standard for attaching a flat panel monitor, and DVI is expected to become widely used. Based on TMDS signaling, the final draft of DVI was introduced in early 1999. Energy Star A program established by the Environmental Protection Agency (EPA) as a partnership with the computer industry to promote the introduction of energy-efficient personal computers which help reduce air pollution caused by power generation. This program was formally launched on June 17, 1993. To comply with the Energy Star guidelines, a computer system or monitor must consume less than 30 watts of power in its lowest power state. ErgoDesign® Features Enhance human ergonomics to improve the working environment, protect the health of the user, and save money. Examples include OSM controls for quick and easy image adjustments, tilt/swivel base for preferred angle of vision, and compliance with MPRII guidelines for lower emissions FCC (Federal Communications Commission) FPMPM VESA Standard Physical Mounting Interface Standard Horizontal Frequency The number of lines illuminated on a video screen in one second. For example, a resolution of 400 lines refreshed 60 times per second requires a scan rate of 24KHz plus overhead (time to bring the beam back to the beginning of the next line). See also Scan Rate. Interlaced Every other line is scanned during each total vertical (full) screen refresh. Inverter A circuit that converts DC current into AC current. LCD (Liquid Crystal Display) An LCD contains two grooved plates which are sandwiched together with liquid crystals along the top plate lining up in one direction, and those along the bottom line up in another direction. The entire panel is then "backlit" so that when light travels through the panel, it shows through the spaces between the crystals. LVDS (Low Voltage Differential Signalling) A transmission method for sending digital information to a flat panel display. LVDS has been widely used in laptops because it enables fewer wires to be used between the motherboard and the panel. The technology is also used between the image scaler and the panel in many stand-alone flat panel displays. Mac Compatibility The ability to offer at least one preset mode that will synchronize with a Macintosh computer. Top Mounting Solutions ( Arms ) For LCD Monitors designed in compliance with VESA Standard Physical Mounting Interface Standard (FPMPM), users may choose mounting solutions from professional arm manufacturers. For example, Ergotron, Inc. Innovative Office Products, Inc. MPR-II Provides reduced electrostatic and electromagnetic emissions. MPR 1990, or MPR-II, is a standard defined to measure emissions from devices such as monitors. Multiple Frequency Technology Automatically adjusts the monitor to the display card’s scanning frequency, thus displaying the resolution required. NEMA (National Electrical Manufacturers Association) develops standards for the electrical manufacturing industry. http://www.nema.org/ See the table in the end for the explanation of the different types of NEMA seals-Enclosures For Non-Hazardous Locations. NUTEK (The Swedish Board for Technical Accreditation). This council produces specifications for automatic power-down and power consumption during normal operation. Top OSD (On-Screen Display) An on-screen control panel for adjusting monitors and TVs. The OSD is used for contrast, brightness, horizontal and vertical positioning and other monitor adjustments. Pivotal Screen Monitors that allow users to swivel the display 90 degrees and place the screen image in portrait orientation. Pixel (PIX [picture] ELement) The smallest addressable unit on a display screen. The higher the pixel resolution (the more rows and columns of pixels), the more information can be displayed. Color systems use a red, green and blue dot per pixel, each of which is energized to different intensities, creating a range of colors perceived as the mixture of these dots. Black is all three dots dark, white is all dots light. Pixel Clock Speed The frequency or speed at which individual pixels (picture elements) in an image are written to the screen. The higher the pixel clock speed, the less likely there will be flicker. Portrait Orientation Display Monitors that allow users to swivel the display 90 degrees and place the screen image in portrait orientation. Refresh Rate Measures the speed that the entire screen is rescanned. Higher frequencies reduce flicker, because they light the pixels more frequently, reducing the dimming that causes flicker; also called vertical frequency. Top Resolution In common usage, this refers to the number of pixels displayed on screen horizontally and vertically. Higher resolution means that you can see more of your image on the screen without scrolling or panning. Response Time This figure indicates how quickly an LCD panel can display a change in the brightness of the screen image. It is calculated as the sum of the times needed for the image to change from 10% to 90% of its maximum brightness, and from 90% to 10%. Faster response times allow a smoother display of rapidly-changing screen images, such as real-time video. Rotation Swiveling the display 90 degrees and place the screen image in portrait/ landscape orientation. Scaling The ability of the monitor to display or scale a variety of different resolution signals to the screen while also maintaining the aspect ratio of the image. Scan Rate Indicates the speed, measured in kilohertz, at which a single horizontal line is drawn on the screen. Higher scan rates are needed to provide sharper, crisper images at higher resolutions; also called horizontal Top Stripe Pitch A measurement of distance between the centers of two same-color stripes that make up a screen image. The closer the stripes, the smaller the stripe pitch, and the sharper the image. TCO-95 The labeling scheme was developed as a joint effort by the TCO (The Swedish Confederation of Professional Employees), Natursikyddsforeningen (The Swedish Society for Nature Conservation) and NUTEK (The National Board for Industry and Technical Development in Sweden). The requirements cover a wide range of issues: environment, ergonomics, usability, emission of electrical and magnetic fields, energy consumption and electrical and fire safety. TFT (Thin Film Transistor) The term typically refers to active matrix screens on laptop computers. Active matrix LCD provides a sharper screen display and broader viewing angle than does passive matrix. Tilt and Swivel The ability for the monitor head to either move up and down (tilt) or side to side (swivel). Top Touch Screen A display screen that is sensitive to the touch of a finger or stylus. Touch screens are very resistant to harsh environments where keyboards might eventually fail. They are often used with custom-designed applications so that the on-screen buttons are large enough to be pressed with the finger. Applications are typically very specialized and greatly simplified so they can be used by anyone. However, touch screens are also very popular on PDAs and full-size computers with standard applications, where a stylus is required for precise interaction with screen objects. (Underwriters Laboratory). A non-profit safety organization in the U.S. that inspects and certifies the products sold in the U.S. and Canada for their safety standards. Vertical Frequency Also called "refresh rate," it is the number of times an entire display screen is refreshed, or redrawn, per second. Measured in Hertz, display systems typically range from 56Hz to well over 100Hz. A minimum of 70Hz is recommended to help prevent eye strain. VESA Video Electronic Standards Association. A group made up from the video electronics industry to review proposals and develop standards to promote uniformity and economies of scale in the video electronics industry. VESA DPMS (VESA Display Power Management Signaling) A VESA standard for signaling the monitor to switch into energy conservation modes. It provides for two low energy modes: standby and suspend. Top Viewing Angles The horizontal or vertical angle at which the user can view the screen image with no loss of color fidelity or image clarity.
The environmental demands concern, among other things, restrictions on the presence and use of heavy metals, brominated and chlorinated flame retardants, CFCs (freons), and chlorinated solvents. The product must be prepared for recycling and the manufacturer is obliged to have an environmental plan, which must be adhered to in each country where the company implements its operational policy.
The energy requirements include a demand that the computer and/or display shall reduce its power consumption to a lower level after a certain period of inactivity, in one or more stages. The length of time to reactivate the computer shall be reasonable for the user.
Labeled products must meet strict environmental demands, for example in respect of the reduction of electric and magnetic fields, along with physical and visual ergonomics and good usability.
There are two primary technologies used for touch screens and both use a clear glass panel overlaid onto the CRT or LCD screen. The resistive method is completely pressure sensitive. It uses a plastic layer on top of a metallic-coated glass layer, separated by spacers. When pressed, it shunts the current in the glass panel, and the x-y coordinates pick up the location on the screen.Common fault diagnosis techniques and maintenance practices of LCD Advertising players
1, Ping-line may be broken, the replacement screen line
2, motherboard bad, replace the motherboard
● Blue Screen phenomenon of failure causes:
1, according to the remote control of the "POWER" button to make it restart.
2, such as frequent, and continued a long time, please contact us.
● Non-Reader
Cause of the malfunction:
1.CF card connector pins appear bent, to clamp the dial straight
2. Replace the motherboard
● turn off automatically after a
Cause of the malfunction:
1. First, the menu is set to determine whether the timer is turned off
2. The machine short-circuit phenomena can replace the motherboard
3. Inverter is not working properly, replace the high-pressure section
● black (no picture no sound) cause of the malfunction:
1, the machine did not power to check whether the power plug, power switch inside the machine has open, press POWER button on the remote control
2, in the case of the electricity is still not boot, no work can be judged as the replacement motherboard motherboard
● black (with sound without images) fault causes:
Screen backlight did not work, there are three kinds of possibilities:
1, high-pressure section and the screen or the motherboard connection off, you can plug in connection
2, high pressure of the bad, the replacement of high-pressure
3, board bad, replace the motherboard
● white screen (no picture no sound)
Cause of the malfunction: the motherboard or bad, replace the motherboard
● white screen (with sound without images)
Cause of the malfunction: Ping-line not plugged and re-plug off (note the screen line, surface, do not insert anti-)
● black and white (off white screen)
Cause of the malfunction: the motherboard or bad, replace the motherboard
● remote control not working
Cause of the malfunction:
1. Remote Control without electricity or bad
2. Remote control head or a bad motherboard or bad, to replace
● timer expired password is lost can not enter a password, display an error, please replace the motherboard
● screen serious flicker phenomenon, its causes are
(1) magnetic interference
(2) Supply voltage stability
(3) monitor, graphics card driver problem
● How to clean shells
The use of cotton dip fresh water cleaning, do not use any cleaning agent, so that the factory would lose their unique shell luster.
● Why LCD to switch on the screen appeared on the interference pattern miscellaneous?
This is to show the card caused by signal interference, is a normal phenomenon. Can be automatically or manually adjust the phase to solve the
This problem.
● How to clean LCD screens
Clean LCD screen, as far as possible not to use too heavy a damp cloth with water in order to avoid moisture into the LCD screen, which led to internal short-circuit fault and so on. Recommended glasses cloth, lens paper on the LCD screen, soft material to wipe, so that moisture can be avoided and access to the internal LCD, but also will not scratch the screen.
● synchronize two machines can not play for two reasons
(1) error in 0.5 seconds or less, is a normal phenomenon;
(1) a period (such as 8 minutes) can synchronize the start of play, slowly bigger error, check whether the wear and tear over the disc, if requested to replace a new disc.
(1) can not synchronize, check whether the two machines are loaded into the launch of advertising machine, or to receive advertising machine, if the installation is no problem, please contact the supplier or a professional maintenance staff.