BACKLIGHT UNITS WITH SUPPORT POSTS AND CAVITY HEIGHT MONITORING

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...

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Bibliographische Detailangaben
Hauptverfasser:	HONG, Ziruo, BAE, Sungwon, LIU, Rong, QI, Jun, SUN, Yu P, ZWEIGLE, Erik A, YIN, Victor H
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	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.