LCD monochrome LCD screens usually have two display types, positive display and negative display. Let's take the segment code screen as an example to introduce the difference between these two display types:
1. Zhengxian
The so-called positive display means that the color of the displayed content is darker than the background color, such as black text on a yellow-green background (yellow-green screen) and black text on a gray-white background (FSTN). This type of screen has a better display effect under the sun.
As shown in the above 2 pictures, the background is gray/green, the characters are black, and the color of the characters is darker than the background, that is, it is positive display;
There is also a simple way to distinguish, that is, the colors of most of the positive characters are black characters. I just said that this type of screen displays well in the sun. It is precisely because the characters are black that they are not easy to display in the sun. Caused by the impact.
2. Negative display
The so-called negative display means that the color of the displayed content should be lighter than the background color, such as white characters on a blue background (blue screen), white characters on a black background (VA segment code screen), this type of screen has relatively high contrast, and the indoor display effect is required. Better than Zhengxian.
As shown in the above 2 pictures, the background is black/blue, the character is white, and the character color is lighter than the background color, which is a negative display;
There is also a simple way to distinguish, that is, the color of most negatively displayed characters is white, because the LCD screen itself does not emit light, the color of negatively displayed characters is actually the color of the backlight through the glass, and the backlight is white. The word is white, in other words, the negative display must have a backlight to display the content.
At the same time, there is also a very common practice for negative display, which is color silk screen printing. After silk screen printing, the LCD screen will become colorful and diverse, please see:
It can be said that it is precisely because of this approach that LCD screens will become more distinctive and innovative. Many customers customize various LCD screens in our company. In order to reflect high-end effects, they will choose negative Display + color screen printing, this is also a product that is very worthy of everyone to choose.
