LCD Modules
STN technology with controller
The term “LCD modules” refers to displays using STN technology. While TFT modules offer high resolution and brilliant colors, this display technology has other advantages.
Readability in sunlight
Reflective STN modules rely on ambient light. Readability increases as ambient brightness increases. In transflective versions, an LED backlight supports display in poor lighting conditions.
Easy control
Graphics displays have a built-in controller that can be controlled by almost any microcontroller via a simple interface (e.g., 8-bit bus, SPI). Unlike high-resolution TFT displays, the built-in image memory only needs to be refreshed when the content changes. A processor with a built-in graphics controller is therefore not required.
Wide selection
The selection of standard modules is very diverse. Resolution and diagonal size are variable, and the display technology (reflective, transflective, or even transmissive, background color) is also available in many variants.
Custom Modules
If no standard module can be found, a custom design can be developed with significantly less effort than with TFT. This is already worthwhile for moderate quantities. It is easier to adapt the interface, as some controllers are configurable, or to design the connector to suit the project.
Cost advantage
The use of an LCD module is particularly worthwhile for devices that are equipped with only a low-complexity user interface. The system costs are significantly lower than for a TFT:
- The processor does not need a graphics controller to refresh the display periodically.
- The amount of data and thus the memory requirements on the computer side are lower, as only monochrome content (1 pixel = 1 bit) needs to be manipulated, rather than color data (1 pixel = 18 or 24 bits).
Dimensions
Reflective displays that do not require a backlight consist only of the display glass, onto which the controller is applied using chip-on-glass technology. The installation depth is therefore minimal.
Power consumption
Power consumption is minimal, especially for modules without a backlight, ensuring longer battery life for mobile devices.
Applications
- Measuring devices with a low level of complexity in their user interface: energy meters, pumps
- Devices with limited energy available: mobile measuring devices, parking meters with solar cells
- Medical devices: blood pressure monitors, pulse oximeters
- Security: smart cards
- White goods: stoves, washing machines, dishwashers
Consulting and contact
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