公开(公告)号：US20170193971A1

公开(公告)日：2017-07-06

申请号：US15271085

申请日：2016-09-20

Applicant: Apple Inc.

Inventor： Yafei Bi ,  Arthur L. Spence ,  Vanessa C. Heppolette ,  Eran Tamari ,  Josh P. DeCesare

IPC: G09G5/39 ,  G09G5/00

CPC classification number: G09G5/39 ,  G09G5/001 ,  G09G5/12 ,  G09G5/18 ,  G09G5/393 ,  G09G5/395 ,  G09G2310/04 ,  G09G2340/0435 ,  G09G2360/18

Abstract: Systems and methods for synchronizing a video source and display circuitry using a dynamic tearing effect (TE) signal are provided. In one embodiment, an electronic display device includes: variable refresh rate circuitry that, when no new frame data is provided to the electronic display device, extends a vertical blanking period and reduces a refresh rate of the electronic display device. A tearing effect signal is generated, which is selectively set to a first logical level at a first period of time and a second logical level at a second period of time. The tearing effect signal is provided to the host electronic device that provides frame data to the electronic display device and upon receipt of new frame data, an un-extended vertical blanking period is returned to and the frame data at the next frame boundary is displayed.

公开(公告)号：US10019968B2

公开(公告)日：2018-07-10

申请号：US15271085

申请日：2016-09-20

Applicant: Apple Inc.

Inventor： Yafei Bi ,  Arthur L. Spence ,  Vanessa C. Heppolette ,  Eran Tamari ,  Josh P. DeCesare

IPC: G09G5/12 ,  G09G5/18 ,  G09G5/395 ,  G09G5/39 ,  G09G5/00 ,  G09G5/393

CPC classification number: G09G5/39 ,  G09G5/001 ,  G09G5/12 ,  G09G5/18 ,  G09G5/393 ,  G09G5/395 ,  G09G2310/04 ,  G09G2340/0435 ,  G09G2360/18

Abstract: Systems and methods for synchronizing a video source and display circuitry using a dynamic tearing effect (TE) signal are provided. In one embodiment, an electronic display device includes: variable refresh rate circuitry that, when no new frame data is provided to the electronic display device, extends a vertical blanking period and reduces a refresh rate of the electronic display device. A tearing effect signal is generated, which is selectively set to a first logical level at a first period of time and a second logical level at a second period of time. The tearing effect signal is provided to the host electronic device that provides frame data to the electronic display device and upon receipt of new frame data, an un-extended vertical blanking period is returned to and the frame data at the next frame boundary is displayed.