There are good arguments for all display technologies (see below), because the „ideal display“, which fulfils all properties optimally and is also inexpensive to purchase, has not yet been invented. Monochrome displays, for example, are not as stylish as colour displays, but they do save energy and are generally very easy to read in sunlight. And although OLED displays have been under constant development for many years, they are rarely a complete replacement for LC displays. A good way to narrow down the almost unmanageable variety is to approach it from the perspective of the application or the requirements.

Power-saving displays for handhelds

The device is compact and probably even battery-operated. The integrated display must be correspondingly small and, if necessary, flat. The width should not exceed 80 mm.
A 3.5-inch display, for example, is a convenient size and can also be installed upright („portrait“ mode). Inexpensive colour displays are available in this size, as well as high-quality, bright displays using IPS technology.
However, the power consumption is often also a decisive factor, which largely determines the required capacity of the battery. The backlight of a display requires the most power, closely followed by the power consumption of the microcontroller. Assuming the lighting and display require around 450 mW during operation (typical for a 3.5-inch colour display) and the device is to last a complete working day before the battery needs to be charged: the capacity required for a LiPo battery is calculated as follows: C=E/U, i. e. C= 8 h*450 mW/3.7 V = 1,000 mAh. The capacity required for the controller and other electronics must be added to this.