BACKLIGHT UNITS WITH SUPPORT POSTS AND CAVITY HEIGHT MONITORING

    公开(公告)号:EP3978994A1

    公开(公告)日:2022-04-06

    申请号:EP21210260.2

    申请日:2018-03-16

    Applicant: Apple Inc.

    Abstract: An electronic device may have a display with a backlight (42). The backlight provides backlight illumination for an array of pixels (24) that is displaying images. The backlight includes an array of cells (38C). Each cell contains a light source (38) with one or more light-emitting diodes (38D) and a cavity reflector (68) that reflects light from the light source outwardly through a diffuser (34) for use in forming the backlight illumination. The light sources are mounted to a printed circuit (60). Support posts (90) on the printed circuit are used to maintain the diffuser at a fixed distance (H) from the printed circuit. Sensors (104) on the printed circuit are used to measure separation distances between the printed circuit and diffuser. Adjustments to pixel gain profiles can be made based on the measured separation distances to maintain uniform illumination.

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