RGB+Spi 3.5 Inch Square TFT LCD Display

LCD monochrome LCD screens usually have two display types, positive display and negative display Liquid Crystal 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 in the sun Passive matrix OLED.

The background is gray and white/green, the words are black, and the color of the words is darker than the background, that is, the positive display;

There is also a simple way to distinguish, that is, the colors of most 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 TFT LCD Display.

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 text on a blue background (blue screen) and white text screen 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.

The background is black/blue, the words are white, and the color of the words is lighter than the background, that is, 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 0.96inch TFT.

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.