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TFT / Display Glossary             

¼ VGA
Resolution of 320 X 240 dots 
½ VGA
Resolution of 640 X 240 dots
8 Bit Interface
Display is driven with 8 data bus lines
16 Bit Interface
Display is driven over 16 data bus lines
ACTIVE AREA
In the viewing area of the LCD glass, the dimensions of the perimeter of the conductive area.
ACTIVE MATRIX
A display where each pixel is driven by a thin film transistor (TFT).
BEZEL
A frame of plastic or metal, fitting over the LCD glass, to protect the edges of the glass and act as a pressure device, compressing the elastomer connector between the PCB and LCD glass.
BACKLIGHT (B/L)
A light source that is placed behind the display to make the display readable in poor/no light situations.
CCFL
Cold Cathode Fluorescent Lamp, previously used for backlights in displays.
COMMON/BACKPLANE
The superimposition of the conductive pattern from one piece of glass to the second piece. The duty ratio is determined by the number of backplanes.
CONTACT EDGE
The area of the LCD with conductive leads/traces where electrical connection is made by use of a connector.
CONTRAST RATIO
The difference in luminance between the unselected area and the selected area.
CROSS-TALK 
Cross - Talk is the defect produced by the interference of the adjacent pixels.
The contrast of these crosstalk areas are different from other areas. Crosstalk can appear only with certain display patterns.
CTP
Capacitive Touch Panel
CURSOR
Dots used to indicate the location of the next character or symbol to be entered.
DIL (Dual-In-Line)
Two parallel rows of connection holes on a PCB. Also, the type of connector used with this array.
DIRECT/STATIC DRIVE
The method in which each conductive lead on the contact edge connects to one segment or annunciator.
DOT GAP
The space containing liquid crystal fluid between the two pieces of glass.
DOT/PIXEL
An active element that forms a character or symbol when combined in a matrix.
DOT MATRIX
A group of dots/pixels forming a character or symbol, usually five dots across and seven dots down.
DSI
Display Serial Interface
DUTY RATIO
1/N when N is equal to the number of segments selected by one complete cycle.
EDGE LIGHTING
A backlight in which the tube(s) are located at the side of the display and uses a light guide to get even lighting across the display, which allows for thinner displays.
ELASTOMER CONNECTOR
A silicone rubber strip made up of sequentially spaced conductive and non-conductive material. The most common method of connection for LCD modules.
FILL HOLE
The space left between the epoxy seals on one end of the LCD glass after assembly. This space, used to fill the glass with the liquid crystal fluid, is noted by a mound of epoxy.
FONT
The active pattern containing the information to be displayed in the LCD glass.
GHOSTING
A phenomenon occurring when voltage from an energized element leaks to an adjacent OFF element and turns the adjacent element partially ON.
GREY SCALE
Greyscale is a range of shades of grey without apparent colour. The darkest possible shade is black, which is the total absence of transmitted or reflected light. The lightest possible shade is white, the total transmission or reflection of light at all visible wavelengths. Intermediate shades of grey are represented by equal brightness levels of the three primary colours (red, green and blue) for transmitted light, or equal amounts of the three primary pigments (cyan, magenta and yellow) for reflected light.
HDMI
High Definition Multimedia Interface
HEAT SEAL
A flexible adhesive connector bonded by heat to the contact edge of the glass.
 

INTERCONNECT DOT
Consisting of silver impregnated epoxy, it connects the
pattern piece of glass to each backplane.
INVERTER, DC to AC
Converts DC to AC at a high frequency, and powers                         electroluminescent lamps.
IPS
In Plane Switching is a display technology that gives all round viewing angles.
LEADS
The conductive traces on the contact edge of the glass.
LED
Light Emitting Diode, now used in nearly all display backlights.
LIQUID CRYSTAL FLUID
Having properties of both a solid and a liquid, it consists of rod-shaped bipolar molecules which are capable of twisting polarized light when in the OFF state.
LVDS
Low Voltage Differential Signalling is used for long distance control.
MCU
Micro Controller Unit. Basic controller, generally found on small TFTs.
MIP
Memory In Pixel
MIPI
Mobile Industry Processor Interface
MODULE
An LCD glass connected to a PCB with drivers on board. It may also have controllers, temperature compensation circuits, or other features.
MULTIPLEX
Using multiple backplanes in order to reduce the number of connections between the LCD and the drivers.
O-Film
A film that can be added to a display to give it greater viewing angles.
PITCH
The centre dimension of adjacent conductive traces, dots, or connector holes.
PIXEL
The same as "dot."
RGB Interface
Can be 16 bit, 18 bit, or 24 bit. The display has no on board memory mapped controller and will require a PIC
RMTS
Resistive Multi Touch Screen
RTP
Resistive Touch Panel
SATURATION VOLTAGE
RMS voltage required to turn fluid to 90% on.
SIL (Single-In-Line)
An LCD module that has a single row of connection holes, and an LCD glass with a single contact edge.
SVGA
Resolution of 800 X 600 dots
SXGA
Resolution of 1280 X 1024 dots
TAP AUTOMATED BONDING (TAB)
Chip mounted to the flat flexi of the display
TFT
Thin Film Transistor
THRESHOLD VOLTAGE
RMS voltage required to turn fluid to 10% on. 
TRANSFLECTIVE
A type of backing, bonded to the rear polarizer, which enables light to pass through the back as well as reflecting light from the front.
TRANSMISSIVE
An LCD which does not have a reflector or transflector laminated to the rear polarizer. A backlight must be used with this type of LCD configuration.
TWISTED NEMATIC (TN)
In a quiescent state, display has a 90° twist in the alignment of the liquid crystal molecules at the transition between the surfaces of the two glass substrates.
UART
Universal Asynchronous Receiver/Transmitter is an interface used to control a serial interfaced display module.
USB
Universal Serial Bus
VGA
Resolution of 640 X 480 dots
VIEWING ANGLE
A cone perpendicular to the LCD in which minimum contrast can be seen.
VIEWING AREA
The dimensions measured from the inside perimeter of the LCD bezel or LCD glass epoxy seal.
WIDE VGA (WVGA)
Resolution of 800 X 480 dots
WIDE ¼ VGA (WQVGA)
Resolution of 480 X 272 dots
XGA
Resolution of 1024 X 768 dots







 

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