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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10901260 B1

PDFFull Text
Date of Patent:
Jan. 26, 2021

Filed:

Mar. 06, 2019

Displays with direct-lit backlight units

Applicant:

Apple Inc., Cupertino, CA (US);

Inventors:

Rong Liu, Sunnyvale, CA (US);

Jun Qi, San Jose, CA (US);

Victor H. Yin, Cupertino, CA (US);

Wei Lv, San Jose, CA (US);

Joshua A. Spechler, Cupertino, CA (US);

Yu P. Sun, Yorba Linda, CA (US);

Suraj P. Gorkhali, San Jose, CA (US);

Daming Xu, Santa Clara, CA (US);

Edward H. Kang, San Francisco, CA (US);

Wenyong Zhu, San Jose, CA (US);

Ziruo Hong, Cupertino, CA (US);

Xinyu Zhu, Sunnyvale, CA (US);

Ling Han, Cupertino, CA (US);

Mookyung Son, Cupertino, CA (US);

Pee Khiam So, San Jose, CA (US);

Janos C. Keresztes, Cupertino, CA (US);

Chenhua You, San Jose, CA (US);

Zhenyue Luo, Santa Clara, CA (US);

Heesang Suh, Saratoga, CA (US);

Juan He, Orlando, FL (US);

Hung Sheng Lin, San Jose, CA (US);

Assignee:

Apple Inc., Cupertino, CA (US);

Attorneys:

Treyz Law Group, P.C.

Joseph F. Guihan

Primary Examiner:

Rajarshi Chakraborty

Assistant Examiner:

Michael Chiang

Int. Cl.
CPC ...
G02F 1/13357 (2006.01); H05K 1/02 (2006.01); H05K 1/18 (2006.01); H05K 3/22 (2006.01); H05K 3/34 (2006.01); F21K 9/64 (2016.01); H01L 25/075 (2006.01); H01L 33/54 (2010.01); H01L 33/62 (2010.01); H01L 33/64 (2010.01); F21Y 115/10 (2016.01);
U.S. Cl.
CPC ...
G02F 1/133603 (2013.01); F21K 9/64 (2016.08); G02F 1/133605 (2013.01); G02F 1/133606 (2013.01); G02F 1/133608 (2013.01); G02F 1/133609 (2013.01); G02F 1/133611 (2013.01); H05K 1/0204 (2013.01); H05K 1/181 (2013.01); H05K 3/22 (2013.01); H05K 3/3431 (2013.01); H05K 3/3494 (2013.01); F21Y 2115/10 (2016.08); G02F 2001/133607 (2013.01); G02F 2001/133612 (2013.01); G02F 2001/133614 (2013.01); G02F 2001/133628 (2013.01); H01L 25/0753 (2013.01); H01L 33/54 (2013.01); H01L 33/62 (2013.01); H01L 33/644 (2013.01); H01L 2933/0066 (2013.01); H01L 2933/0091 (2013.01); H05K 1/0203 (2013.01); H05K 2201/10106 (2013.01); H05K 2201/10522 (2013.01);
Abstract

A display may have a pixel array such as a liquid crystal pixel array. The pixel array may be illuminated with backlight illumination from a backlight unit. The backlight unit may include a printed circuit board, a plurality of light-emitting diodes mounted on the printed circuit board, at least one light spreading layer formed over the printed circuit board that spreads light received from the plurality of light-emitting diodes, a partially reflective layer formed over the at least one light spreading layer, a color conversion layer formed over the partially reflective layer, a collimating layer formed over the color conversion layer, a brightness enhancement film formed over the collimating layer, and a diffuser formed over the brightness enhancement film. The at least one light spreading layer may include two light spreading layers with elongated protrusions that are rotated relative to each other.

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