公开(公告)号：US11798460B2

公开(公告)日：2023-10-24

申请号：US16535734

申请日：2019-08-08

Applicant: Apple Inc.

Inventor： Zhuoran Dai ,  Shen Ren ,  Christopher M. Dodson ,  Kenneth J. Vampola ,  Mahdi Nezamabadi ,  Ates C. Dumlupinar

IPC: G09G3/32 ,  G01J1/42

CPC classification number: G09G3/32 ,  G01J1/4204 ,  G09G2320/045 ,  G09G2320/0626 ,  G09G2320/0666 ,  G09G2330/10 ,  G09G2354/00 ,  G09G2360/141 ,  G09G2360/144 ,  G09G2360/145

Abstract: An electronic device may have a display. The display may have light-emitting diode pixels or other pixels. Due to aging-induced degradation of the pixels, the output intensity and color of the pixels may vary over the lifetime of the display. Control circuitry in the device may use an ambient light sensor to measure ambient light and stray display light. The display light measurements may be used in monitoring aging effects so that the control circuitry can compensate for aging-induced pixel degradation. Display light measurements may be made over a sequence of image frames. The image frames in the sequence of frames may include white and black frames or frames of different colors interleaved with black frames. Different frame intensities may be used during measurements of stray display light to gather gamma curves for the display.

公开(公告)号：US20210043130A1

公开(公告)日：2021-02-11

申请号：US16535734

申请日：2019-08-08

Applicant: Apple Inc.

Inventor： Zhuoran Dai ,  Shen Ren ,  Christopher M. Dodson ,  Kenneth J. Vampola ,  Mahdi Nezamabadi ,  Ates C. Dumlupinar

IPC: G09G3/32 ,  G01J1/42

Abstract: An electronic device may have a display. The display may have light-emitting diode pixels or other pixels. Due to aging-induced degradation of the pixels, the output intensity and color of the pixels may vary over the lifetime of the display. Control circuitry in the device may use an ambient light sensor to measure ambient light and stray display light. The display light measurements may be used in monitoring aging effects so that the control circuitry can compensate for aging-induced pixel degradation. Display light measurements may be made over a sequence of image frames. The image frames in the sequence of frames may include white and black frames or frames of different colors interleaved with black frames. Different frame intensities may be used during measurements of stray display light to gather gamma curves for the display.