Technical Resources

CSTN: Color Super Twisted Nematic

Color STN modules employ a FSTN cell structure combine with a internal color filter. Each square pixel of a color STN LCD is broken up into three rectangular sub pixels comprising of a red, blue, and green filtered sub pixel. The combinations of these three colors in different grey shades give the display a color […]

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TFT: Thin Film Transistor or Active Matrix LCD

Active-matrix TFT LCDs utilize tiny switching transistors and capacitors, called thin film transistors (TFT), or thin film LCD. Each thin film transistor is arranged in a matrix directly on the glass substrate using amorphous silicon. In order to address a particular pixel on a thin film transistor display, the proper row and column is addressed. […]

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Viewing Modes

Transmissive The liquid crystal cell has no reflective properties. The image is created by utilizing a backlight behind the display. The liquid crystal cell acts as a light valve to either let the light though the display or block the light. This technology is used when there is little ambient light sources available. Reflective This […]

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Viewing Direction

Liquid crystal displays are typically non symmetrical with respect to their viewing direction. The viewing cones are focused either above or below the horizontal plane of the display. Bottom view or 6:00 will be used when the user is below the perpendicular plane of the display and top view or 12:00 is utilized when the […]

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Backlight Options

LED (Light-Emitting Diode) LED backlights consist of surface mount LED’s, which are positioned in a matrix along the bottom of a shallow plastic tray and encapsulated with a clear epoxy (LED array type). For an edge lit display, LED’s are placed along the side or sides of a thin plastic light guide which then transmits […]

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Touchscreen Options

4-Wire Resistive Resistive touch screens have a flexible top layer and a rigid bottom layer separated by insulating dots, with the inside surface of each layer coated with a transparent conductive coating. Voltage applied to the layers produces a gradient across each layer. Pressing the flexible top sheet creates electrical contact between the resistive layers, […]

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Optical Performance Metrics

Contrast Ratio The contrast ratio is the ratio of the luminance between a pixel in the “light” state compared to the same pixel in the “dark” sate. Typical contrast ratios for the different technologies are: TN 9:1 STN 10:1 FSTN 15:1 CSTN 25:1 TFT 300:1 Brightness Brightness or luminance of a display is the measure […]

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Common Graphic Resolution Formats

1/8VGA 160 x 120 QCIF 176 x 144 QCIF+ 176 x 220 QCIF ++ 176 x 240 QVGA 320 x 240 WQVGA 480X240 1/2VGA 640 x 240 VGA 640 x 480 WVGA 800X480 SVGA 800 x 600 XGA 1024 x 768 Common Graphic Resolution Formats was last modified: June 18th, 2012 by kkyang

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FSTN: Film Compensated STN

Film Compensation Super Twisted Nematic, FSTN, consists of an STN LCD with an additional retarder film added to the outside of the cell to compensate the color shift of blue on green to black on white, resulting in the compensation. Film compensation improves the viewing angle and provides the sometimes preferred black on white graphic […]

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Display Utilizing Color Filters & Masking

Black Masking Through the use of back masking placed inside the liquid crystal cell, Phoenix Display International can create a unique custom application in either TN or STN technologies. Color Masking By utilizing different pigments and additional screen-printing processes we are able to create custom area color displays. Color Filters By utilizing tinted polarizers, we […]

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STN:Super Twisted Nematic

Super twisted nematic is a higher information content liquid crystal cell structure that uses adjustable interference of two optical modes to achieve a large number of multiplexed lines, higher contrast and higher level of gray scale. This results in a birefringence effect. The STN LCD liquid crystal twist is generally between 240 and 270 degrees. […]

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TN: Twisted Nematic

Twisted nematic display, (TN), is type of liquid crystal cell structure that aligns the LC molecules through a 90′ rotation. This twisted nematics configuration can produce images in two modes: Positive or Negative. Positive Mode provides white background and white segments. Twisted nematic LCD modules are typically the least expensive display option, But can only […]

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