Apple Inc.

Prasanna Nambi

Paolo Sacchetto

Taesung Kim

Marc Albrecht

Sandro Hermann Pintz

Christopher P Tann

David W Lum

Fenghua Zheng

Jason N Gomez

The disclosure describes procedures for dynamically employing a variable refresh rate at an LCD display of a consumer electronic device, such as a laptop computer, a tablet computer, a mobile phone, or a music player device. In some configurations, the consumer electronic device can include a host system portion, having one or more processors and a display system portion, having a timing controller, a buffer circuit, a display driver, and a display panel. The display system can receive image data and image control data from a GPU of the host system, evaluate the received image control data to determine a reduced refresh rate (RRR) for employing at the display panel, and then transition to the RRR, whenever practicable, to conserve power. In some scenarios, the transition to the RRR can be a transition from a LRR of 50 hertz or above to a RRR of 40 hertz or below.

Low power display device with variable refresh rates

Techniques are provided for improving electronic display startup time using extended display identification data (EDID) shadowing. In one example, a method for starting an electronic display may include accessing, by a timing controller, EDID from a memory device. The method may also include storing EDID from the memory device in the timing controller. The method may include, after storing EDID from the memory device, transmitting a signal from the timing controller to a host device to indicate that the host device can access the stored EDID. The method may also include accessing, by the timing controller, configuration data from the memory device. The method may include, after transmitting the signal to the host device, transferring the EDID stored in the timing controller to the host device while the timing controller is accessing the configuration data resulting in reduced startup time of the electronic display.

Edid shadowing techniques for fast display startup

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Cupertino, CA, United States of America

Prasanna Nambi