公开(公告)号：US20180374450A1

公开(公告)日：2018-12-27

申请号：US15691687

申请日：2017-08-30

Applicant: Apple Inc.

Inventor： Nachum M. KANOVSKY ,  Marc ALBRECHT ,  Tobias JUNG ,  Xiaokai LI ,  Ameya Y. JOSHI

IPC: G09G5/10 ,  G09G5/393 ,  G09G3/36

CPC classification number: G09G5/10 ,  G09G3/2062 ,  G09G3/3607 ,  G09G5/363 ,  G09G5/393 ,  G09G5/395 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/0242 ,  G09G2320/0252 ,  G09G2320/103 ,  G09G2340/02 ,  G09G2340/16 ,  G09G2360/08 ,  G09G2360/122 ,  G09G2360/16 ,  G09G2360/18

Abstract: Aspects of the subject technology relate to display circuitry including pixel overdrive circuitry. The pixel overdrive circuitry includes a compression engine that compresses a previous display frame, for storage and comparison to a current display frame without compression or decompression of the current display frame. The compression engine compresses the previous frame in such a way that the maximum compression error is always known and can be used to determine whether to perform overdrive operations for the current frame without compressing and decompressing the current display frame. The compression engine selects gradient encoding or decimation encoding for the compression of the previous display frame and can perform successive decimation operations within the gradient encoding operations to help reduce the size of the compressed previous frame while maintaining the quality of the ultimate overdriven current frame.