Why Does The STN Negative Display of Blue Background and White Text Work Best?

In simply terms, the reason blue background with white text (STN negative display mode) are considered to offer the best visual experience is that, within the technological limitations of the time, they achieved the optimal balance between human visual characteristics, reading comfort, and adaptability to ambient light.

STN: Compared to earlier TN technology, the liquid crystal molecules of STN have a larger torsion Angle (180°–270°). This results in a steeper electro-optical response curve, enabling higher contrast ratios and the display of more content.

The advantages of a blue background with white characters:

1. Text (white): As the highlighted part, it occupies the main visual area of the screen. White encompasses all colors of light, but its brightness mainly comes from the green light component that the human eye is most sensitive to. This makes the text look very clear and bright.

2. Background (Dark Blue): As a low-brightness background, blue is a color to which the human eye is relatively insensitive, minimizing the impact of chromatic aberration on focus. Large areas of dark background reduce visual fatigue and provide excellent contrast for high-brightness text.

3. Anti-glare: A dark background (blue) can absorb more ambient incident light than a light background (such as the grayish-white background of the display), significantly reducing the reflected glare on the screen surface. This ensures that the screen content in negative display mode remains clear and distinguishable even in outdoor or strong light conditions.

This combination ingeniously assigns high-brightness tasks (reading text) to the channels that the human eye is most sensitive to, while assigning low-brightness backgrounds to the channels that the human eye is less sensitive to. Thus, it achieves high contrast while minimizing visual fatigue and chromatic aberration interference to the greatest extent.

Comparison: The disadvantages of Positive Display mode

1. The positive display mode features a grayish-white bckground with black text.

2. A large area of grayish-white background is a sensitive high-brightness zone for the human eye, which is prone to reflecting ambient light and causing glare.

3. The black text relies on the details in the dark areas that the human eye is not sensitive to.

4. Result: Reading is almost impossible outdoors, and looking at a bright background for a long time is more likely to cause eye fatigue. Its only advantage is that in an indoor low-light environment, it has a lower requirement for the power of the current light (it can be darker).

The blue background with white text STN negative display represents the optimal balance between human eye recognition efficiency, visual comfort, optical performance, and application environments.

Jingda display has many tyeps of display mdoule, including 0.96 inch -25 inch TFT display, segment lcd display, character lcd display, graphic lcd display, OLED display&HMI display. Especially in monochrome screens, we have rich experience and price advantages. This year, JINGDA DISPLAY is expanding its product line in the embedded industrial all-in-one device and outdoor lcd digital signage market area in order to meet the different project needs of customers.

If you are looking for the LCD display solution, welcome to visit our official website: www.jda-display.com