Battery cell configuration for organic light emitting diode display in modern smartphones and tablet-PCs

A modern smartphone or tablet-PC is typically equipped a high-resolution and large-size display, which is a primary power consumer. In spite of the relatively high power efficiency of organic light emitting diode (OLED) displays, the integrated display subsystem exhibits low energy efficiency due to power losses in the battery and the boost voltage conversion. In this paper, we for-mulize the system energy efficiency in terms of the battery internal losses as well the converter efficiency considering the OLED power supply condition. We also analyze the effect of recently introduced dynamic (driver) supply voltage scaling technique for OLED displays on the overall system efficiency based on the system-level power profiling result. We introduce the optimal battery setup for different sizes and resolutions of the OLED display for modern smartphones and tablet-PCs.