Dynamic control of scan signals in AMOLED displays
AssigneeGoogle Inc.
InventorsSangmoo Choi, Sang Young Youn
Life of this patent
Estimating the term…
Abstract
This document describes systems and techniques for dynamic control of scan signals in active-matrix organic light-emitting diode (AMOLED) displays. Displays in portable electronic devices, such as smartphones, include tens of thousands of pixels. Scan signals in the display control the brightness and color of individual pixels. A leading source of power consumption in AMOLED displays, however, is the parasitic capacitance in the scan lines that carry the scan signals. As the frame rate of AMOLED displays has increased, the frequency of scan signals and the associated parasitic capacitance has also increased. The described AMOLED display can dynamically control the number of pulses in scan signals to reduce power consumption without degrading image quality.
Claims6
An active-matrix organic light-emitting diode (AMOLED) display, the AMOLED display comprising:
- a display driver, the display driver configured to determine whether an image to be displayed in a current frame has changed from an image displayed in a previous frame;
- and
- multiple scan-line drivers, each of the multiple scan-line drivers operatively coupled to a respective subset of multiple pixels of the AMOLED display, the multiple scan-line drivers configured to:
- in response to a determination that the image to be displayed in the current frame has changed from the image displayed in the previous frame, activate the respective subset of multiple pixels with a scan signal including multiple scan pulses for the current frame;
- and
- in response to a determination that the image to be displayed in the current frame has not changed from the image displayed in the previous frame, determine whether the image to be displayed in the current frame has changed within a multiple number of frames preceding the previous frames.
Dependencies are inferred from the claim text.