Patent · US Active

Local display backlighting systems and methods

US10555389B2 · kind B2 · utility

1Cited by

6References

20Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Yanhui Xie · Austin, US
Asif Hussain · San Jose, US
Jingdong Chen · Shanxi, CN
Manisha P. Pandya · Saratoga, US

Key dates

Filing date	Dec 26, 2018
Grant date	Feb 4, 2020
Priority date	—
Expiry date	Dec 26, 2038

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02B20/30
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Aspects of the subject technology relate to display of an electronic device. The display includes a backlight unit having a voltage source, a string of light-emitting diodes and a bypass switch for each light-emitting diode in the string. The string of light-emitting diodes can receive, at a first end, a supply voltage from the voltage source. The bypass switch for each light-emitting diode is controllable to pulse-width-modulate that light-emitting diode. The headroom voltage feedback circuit is coupled to a second end of the string.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.