What are the technical challenges of power management for small-sized backlit screens?
David Brown: There are indeed many challenges. The first challenge is related to the discussion mentioned in the first part. Designers must balance the system requirements, power sources, and circuit architecture to select the appropriate LED driver circuit structure. Therefore, the designer must weigh the available budget based on the final product.
In addition, size and height also create another technical limitation. Charged pumps with high switching frequency and inductive DC/DC boost solutions allow for the use of smaller external components. In particular, the LED driver circuit based on the charge pump, because the charge pump and the parallel LED power supply require only a small external capacitor, the parallel LED power supply is used to reduce the size of the external components. Whether it is to reduce the size of the external components of the charge pump or the inductive solution, the most important consideration is the switching frequency of the LED driver circuit.
For example, smart phones are usually thinner, lighter and shorter devices, and because of the smaller components, higher costs can be tolerated. In contrast, laptops are cheaper and larger, with plenty of room for larger components.
Will the mainstream of high-end mobile phones in the future be AMOLED?
David Brown: AMOLEDs are an unstoppable trend in small handheld devices, as these devices excel in all possible applications regardless of resolution and color reproduction. However, due to cost considerations and the lack of suppliers in the market, the current adoption of AMOLED as the mainstream of displays has slowed down. In addition, if the AMOLED panel is larger than 5 inches, the installation cost is usually too expensive for most portable products.
There are a few devices on the market that use AMOLEDs, and the display sizes of such products fall between 3 and 5 inches. In the future, as the number of manufacturers increases and the cost of displays decreases, I think AMOLED displays will become the mainstream of mobile applications. AnalogicTech has long supported this market and is actively researching power management solutions for this display technology.
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