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Passive Segment LCD

TN, STN, HTN, FSTN, and VA are different LCD (liquid crystal display) technologies. They differ mainly in how the liquid crystal molecules are aligned or twisted, which affects viewing angle, contrast, cost, and typical applications.

  • TN — Basic, cheap, fast, but poor viewing angles.

  • HTN — Improved TN with a wider viewing angle, still low cost.

  • STN — Much higher twist; better for larger information displays and wider viewing angles.

  • FSTN — STN with a compensation film; gives true black-and-white and better contrast.

  • VA — A different, higher-end LCD technology using vertically aligned molecules; known for high contrast and wide viewing angles.

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Meadow F7 Micro

Passive-matrix LCD

Passive-matrix LCD types are LCDs that do not have a transistor switch at each pixel. Instead, pixels are addressed by row and column electrodes. They are usually simpler, cheaper, and slower than active-matrix TFT LCDs.

  • STN (Super Twisted Nematic) – 180–270° twist. High multiplex capability, wider viewing angle. Often yellow-green or blue. Industrial dot-matrix.

  • FSTN (Film-compensated STN) – STN plus compensation film. True black-and-white, higher contrast. Medical/industrial/outdoor.

  • DSTN (Double-layer STN) – two STN cells/layers. Better contrast and color than STN. Early color laptops.

  • CSTN (Color STN) – STN with color filters. Passive-matrix color. Early mobile phones, PDAs.

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BMW car panel

Active matrix TFT (Thin-Film Transistor) display

works by placing a tiny transistor switch at every single pixel, allowing for independent control, which results in sharper images, faster response times, and better contrast compared to passive matrix displays.

  • TN (Twisted Nematic): The oldest and most cost-effective technology. Its main drawbacks are poor color reproduction and a narrow viewing angle where colors can shift and invert.

  • VA (Vertical Alignment): Developed to improve upon TN. It is known for its high contrast ratios and deep black levels. A major variant is MVA (Multi-Domain Vertical Alignment), which divides each pixel into multiple domains to improve viewing angle uniformity.

  • IPS (In-Plane Switching): Developed by Hitachi to address the poor viewing angles and color of TN panels. Its key advantage is accurate color reproduction and excellent viewing angles. There are many IPS variants, including AFFS (Advanced Fringe Field Switching), FFS (Fringe Field Switching), and PLS (Plane-to-Line Switching).

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