Nokia Display Products Oy

Anders Engberg

Jari Tuomo Pistemaa

Raimo Johannes Ikonen

Turo Rantanen

A method and a device for power management regarding an integrated display unit including a video display and at least one peripheral device, wherein the video display uses horizontal and vertical sync signals for the synchronization of the display images, and the peripheral device uses a peripheral signal to carry out its function. The peripheral device can be an audio unit using audio signals to produce sound. The peripheral device can be a USB connector using a &plus;5 V voltage to indicate a connection being made to the integrated display unit. In the integrated display unit, a single power supply is used to provide electrical power to the video display and the peripheral device. In order to reduce the power consumption by the integrated display unit, a number of power consumption states, based on the presence of the video sync signals and the peripheral signals, are implemented. The presence of the video sync signals can be detected by a micro-controller in the integrated display unit. Alternatively, the presence of the video sync signals or data indicating power save states is signaled to the integrated display unit via USB BUS or other digital communication mean. Likewise, audio signals can be sent as digital data via USB BUS to the integrated display unit.

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Salo, Finland

Anders Engberg