Monochrome Display
2025/11/8
Monochrome LCD TN, HTN, STN, FSTN vs. Monochrome OLED – Key Characteristics & Typical Applications
l http://hanns-lcd.com/en/products.aspx?code=03) – The simplest passive matrix LCD. Liquid crystal molecules are twisted ~90°; an electric field untwists them to block or pass the back light.
l HTN (High Twist Nematic) – A TN variant with a larger twist angle (≈110°-130°). The higher twist improves contrast and widens the viewing angle while keeping the same low cost driver.
l STN (Super Twisted Nematic) – LC molecules are twisted 180°-270°, giving a longer optical path and higher contrast than TN/HTN, but the response is slower.
http://hanns-lcd.com/en/p_details.aspx?code=03&id=1157– An STN panel plus an optical compensation film that cancels colour tint, delivering very high contrast and a much wider view.
l Monochrome OLED (PMOLED) – Self emissive organic diodes arranged in a passive matrix. No back light is needed; each pixel lights independently, giving ultra high contrast and fast response.
Quick Comparison
|
Technology |
Contrast (typ.) |
Viewing angle (total) |
Response time |
Power (static) |
Cost* |
Typical applications |
|
TN |
20:1–40:1 |
≤30° |
5–25ms |
Backlight only (low) |
★★ (lowest) |
Digital watches, calculators, low price segment displays |
|
HTN |
80:1–150:1 |
90°–120° |
5–25ms |
Back light only (low) |
★★ |
Industrial meters, automotive dashboards, portable devices needing a wider view |
|
STN |
40:1–60:1 |
40°–70° |
150–250ms |
Backlight only (low) |
★★ |
Low speed handheld instruments, early mobile phones, battery driven GPS units |
|
FSTN |
100:1–300:1 |
≥80° |
150–250ms |
Backlight only (low) |
★★★ (higher) |
Outdoor/bright environment instruments (POS terminals, medical meters, vehicle clusters) |
|
Monochrome OLED (PMOLED) |
up to 10000:1 |
≈?180° (full view) |
<1ms |
μA range (pixel only) |
★★★ (mid) |
Smart watches, wearables, compact UI panels for micro controllers, low power IoT displays |
\*Cost rating is relative among the listed technologies (★ = lowest, ★★★ = highest).
