公开(公告)号：US20240203332A1

公开(公告)日：2024-06-20

申请号：US18509592

申请日：2023-11-15

Applicant: Apple Inc.

Inventor： Mario Miscuglio ,  Kingsuk Brahma ,  Jie Won Ryu ,  Shengkui Gao ,  Yuchi Che ,  Graeme M Williams ,  Yi Qiao ,  Wei H Yao ,  Jean-Pierre S Guillou

IPC: G09G3/3208 ,  G09G3/32

CPC classification number: G09G3/3208 ,  G09G3/32 ,  G09G2300/0828 ,  G09G2320/0276

Abstract: In a display characterized by regions with different pixel responses due, for example, to local pixel density variation, voltage-to-luminance matching may be non-universal. Therefore, in order to avoid visual artifacts that may hinder a desired visualization of displayed content, it may be advantageous to compensate the different gamma responses. In some cases, such as with electronic devices having a single pixel density across the display, optical calibration may be performed to determine voltage-to-luminance matching. However, in electronic devices with local pixel density variations, it may be disadvantageous to perform optical calibrations for each region with a different pixel density. Instead of using two distinct gamma curves which may include dedicated optical calibration, a global nonlinear scaler (GNLS) compensation may be applied. Embodiments may pertain to techniques for applying a per-channel and band-global gamma-to-voltage compensation to reduce or minimize a relative luminance error amongst different responses of display regions.

公开(公告)号：US20240203335A1

公开(公告)日：2024-06-20

申请号：US18540613

申请日：2023-12-14

Applicant: Apple Inc.

Inventor： Mario Miscuglio ,  Yang Xu ,  Snehal T. Jariwala ,  Yi Qiao ,  Jean-Pierre S. Guillou ,  Jenny Hu ,  Ming Xu ,  Wanqing Xin ,  Zuo Xia ,  Xin Zheng ,  Jie Won Ryu ,  Graeme M. Williams ,  Kingsuk Brahma

IPC: G09G3/3208

CPC classification number: G09G3/3208 ,  G09G2320/0233 ,  G09G2320/0686 ,  G09G2330/021 ,  G09G2340/00

Abstract: Systems and methods described herein may utilize a non-linear scaling relationship to scale brightness of selective portions of the display in a manner that reduces or eliminates perceivable banding effects. By non-linearly controlling changes in brightness of the display, a viewer may perceive a more uniform, linear dimming towards the relatively dimmer region without perceiving banding, leading to improved user experience when viewing the electronic display.