LCD displays. Of course, there is only one color for the backlight and one color for the characters, but as you can see here on the picture above, there could be many colors of backlights. We can have a white backlight, orange, green, blue or any backlight color.
It does not fit every display technology, positive and negative, but as you can see on the picture above, there is a vast number of combinations of different technologies, positive, negative, STN, FSTN or VA technology (Vertical Alignment), a little bit different technology, allowing us to have wide viewing angles, and different backlight colors. So, we can have a lot of different variations that can be used to build every application.
Character LCD displays and graphic LCD displays
The last part of this article covers graphic displays and character displays, the difference between them and how it influences the cost of an LCD display. The most basic LCD displays are the segmented monochrome LCD displays or icon displays. In this kind of LCD displays we have only some icons and characters, but they are defined when the display is being produced. What we see on the display is defined and we cannot have anything else, the other area is completely off. You can only switch on and off the display segments. This is the cheapest technology to produce, and it is made by mask during the production, so it is usually reserved for high volume applications, that are very well defined during the production phase. For example, this can a be kind of watch, or calculator, or temperature controller. The advantage is the cost, but the disadvantage is that later we cannot change anything, we cannot change the software and add another icon.
Character Monochrome LCD Displays
Another type of a display is a graphic display. So, we have character displays and a fully graphic display. The character display is also a very popular technology, and it is a combination between a segment display and the graphic display because we have the fields, that are defined, and they can show only the characters, letters, numbers, symbols and some added characters defined by the controller of a display. On this kind of screen, we cannot put the full graphic, because every character is physically separated from the other.
Fully Graphic Monochrome LCD Displays
Next, we have the fully graphic display. In this kind of LCD display we have a matrix of pixels. It could be 64 by 256, or 64 by 128 pixels, so on this kind of screen we can show almost every image, because we can switch every pixel on and off. We can show letters, characters, images, small, big, anything we want. The disadvantage is the vast number of pixels that we need to connect. The controller and the glass are complicated, because we need to route the wires from every pixel out from the glass and connect it to the controller. So, in the monochrome LCD display family, this kind of display is the most expensive. Other kinds of displays are cheaper, not only because the glass is simple, but because the controllers are simple too.
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