 |
 |
 |
|
 |
LCD Display Solutions Glossary |
|
- Active Area:
- The area of the display or touch panel that is useful for touch or viewing.
- Active Matrix:
- A display where each pixel is driven by a thin film transistor (TFT) deposited in the glass.
- Analog to Digital Controller:
- A controller which converts an analog signal to a digital signal thus providing the input to the display in a digital format.
- Analog Resistive Touch Panel:
- This touch panel is comprised of two transparent resistive layers, separated by small spacers.
Touching the screen causes the two layers to come in contact and form a switch closure. By
measuring the voltage gradient in the horizontal and vertical axis, position can be determined.
- Analog RGB:
- Separate Red, green, and blue video signals used in conjunction with composite sync or separate horizontal and vertical sync.
- Analog Signal:
- A signal that travels continuously. An analog signal may be either direct or alternating current.
- Backlight:
- A light that is placed behind the display to make the display readable in poor lighting conditions.
- Bezel:
- Secures the LCD to the printed circuit board. Can be plastic or metal.
- Bias Voltage:
- A voltage applied to a circuit or device to establish a reference level or operating point of the device during testing.
- CCFL:
- Cold Cathode Fluorescent Light. A type of fluorescent backlight used in flat panel displays.
- CCFT:
- Cold Cathode Fluorescent Tube. Same as CCFL.
- Character Display:
- A display that is used to display letters, numbers, and symbols only. Typically described as Number of lines by number of characters.
- COB:
- Chip on Board. The LCD driver is formatted into an area of the PCB.
- COG:
- Chip on Glass. The LCD driver format is actually mounted on the surface of the LCD Glass.
- COF:
- Chip on Flex. The LCD driver is incorporated into a flex connector, which is attached to the contact edge of the LCD glass.
- Colors:
-
- 3-Bit = 512 colors
- 4-Bit = 4096 colors
- 6-Bit = 262K colors
- 8-Bit = 16M colors
- Contrast Ratio:
- The ratio of the luminance in the light state to that of the dark side.
- Controller:
- An IC, usually mounted in the graphics board, that takes the microprocessor output and tells the display which pixels to light up to produce the image requested.
- Digital:
- A digital signal is one that varies in discrete steps. The signal does not vary smoothly but instead jumps from one level to the next with a sharp discontinuity.
- Driver:
- Voltage IC mounted on the display, which provides the voltage to each row and column (do not confuse with the controller IC).
- DSTN:
- Double Supertwist Nematic Display. A technology that uses a second LCD layer to correct the
color shift in STN display and so produces a black and white image.
- Dual Scan:
- A technique used in passive color and monochrome displays, which effectively divides the screen in half, which doubles the duty cycle in order to increase performance.
- Edge Lighting:
- A backlight in which the tube(s) are located at the side of the display and uses a scattering sheet to get even lighting across the display, which allows for thinner displays.
- EL backlight:
- A type of backlight using electroluminescent material. The thinnest available backlight. Electroluminescent can also be a type of display.
- FRM:
- Frame rate modulation.
- FSTN:
- Film Super Twist Nematic display.
- Graphic Display:
- A display made up of an array of pixel elements. Can be used to display graphics, pictures and text.
- Heat Seal:
- A flat, flexible, adhesive connector which is bonded to the contact edge of the glass by heat.
- Input Bias Current:
- The current that flows at the input due to internal circuitry and bias voltage.
- Input/Output:
- The process of transferring data to and from a computer controlled system using its communication channels, operator interface devices, data acquisition devices, or control interfaces.
- IR Touch Panel:
- Infrared light emitting diodes and detectors are positioned along the screen edges to create a grid of light. A finger or stylus interrupts the light beams and position is determined on the grid.
- Liquid Crystal:
- A liquid in which the molecules are arranged in a regular pattern. Usually used in LCD displays.
- LVDS:
- Low Voltage Differential Signal.
- NTSC:
- National Television Standard Committee. International television standard which uses 525 lines per frame at 60Hz field rate.
- PAL:
- Phase Alternation Line. International television standard which uses 625 lines per frame at 50Hz field rate.
- Passive:
- A technique by which each row and column of the display are multiplexed or addressed in turn (also can be referred to as Duty Type).
- Pixel:
- An individual dot on the display.
- Plasma Display:
- A type of display produced by an electrical discharge that produces a red or white glowing image. Color filters are added to the white image o produce full color.
- Reflective:
- A display that relies on the reflecting ambient light to provide the image. Good in bright lighting or outside.
- Response time:
- Total delay time (Td off) and rise time (Tr).
- Segment:
- A single active area in the segmented displays (as opposed to the background area).
- SVGA Resolution:
- 800x600 pixel count.
- SHA:
- Super High Aperture.
- Touch Panel Controller:
- The hardware element that translates the information between the touch panel and the host system.
- Touchscreen:
- A transparent glass or hard plastic sheet that mounts over the display viewing area and allows users to make a choice and input via touching the screen.
- TFT:
- Thin Film Transistor. Usually refers to an active matrix display in which each pixel is driven by a thin film transistor deposited in the glass.
- TN:
- Twisted Nematic. A type of LCD material. Primarily used in character modules.
- Transflective:
- A cross between transmissive and reflective. Can be used as a reflective display in bright lighting or with a backlight in dim lighting.
- Transmissive:
- A display that uses a backlight shining through the LCD to produce the image. Good in regular or dim lighting. Not for use in sunshine.
- TSTN:
- Triple Super Twist Nematic. Sharp name for film compensated super twist display which uses a
retardation film to correct the color shift in STN displays, and so produces a black and white image.
- VGA Resolution:
- 640x480 pixel count.
- Viewing Angle:
- The angle over which the display can be seen.
- Viewing Area:
- The part of the display that can be seen inside the bezel.
- VFD:
- Vacuum Fluorescent Display.
- XGA Resolution:
- 1024x768 pixel count.
| |
|
|
Worldwide [