The liquid crystals of a VATN display remain perpendicular to the substrate when the device is switched off. When a voltage is applied the oval shaped VATN molecules align vertically rather than horizontally, acting as a more effective barrier to the backlight. Leakage is kept to a minimum. Approximately 5-10% of light escapes from twisted nematic or super twisted nematic effect displays, but less than 1% is lost from VATN LCDs. The effect is that bright coloured characters are rendered on a truly black background, without the hot spots that might occur in traditional LCD displays.
The key attributes of the Midas VATN LCD display range are:
- Very high contrast ratio – 120:1
- Wide viewing angles, up to 170° (Horizontal) and 110° (Vertical)
- -30 to +80°C Operating Temperature
- Built-in HD44780 compatible controllers
- High backlight brightness
- Super black background
The modules are available in seven industry standard character sizes, such as 8×2, 16×1, 16×2 and 20×4. Backlight colours include white, yellow, blue, green and red.