Apple Inc.

Daming Xu

Victor H Yin

Mookyung Son

Jun Qi

Rong Liu

Heesang Suh

Wenyong Zhu

Chenhua You

Suraj P Gorkhali

Joshua A Spechler

Ziruo Hong

Zhenyue Luo

Ling Han

Wei Lv

Yufeng Yan

Xinyu Zhu

Juan He

Qingbing Wang

Pee Khiam So

Yu P Sun

Adria Fores Herranz

Janos C Keresztes

Shin-Ying Lu

Hung Sheng Lin

Zhibing Ge

Marc Albrecht

Zhenbin Ge

Xiaokai Li

Aaron L Holsteen

Ross Thompson

Thomas O Henry

Judith C Segura

Wei He

Michael Tom

Mahnaz Mohammadi

Mingkun Li

Jay Mayur Khandhar

Shaofeng Liu

Edward H Kang

Shan-Ting Hsu

Byungsoo Ko

Thomas Mueller

Alexander P Yu

Ryan A Zimmerman

Po Hsun Chen

Fei Yan

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 direct-lit backlight unit. The backlight unit may include an array of light-emitting diodes on a printed circuit board. The backlight unit may include first, second, and third light spreading layers formed over the array of light-emitting diodes. A color conversion layer may be formed over the first, second, and third light spreading layers. First and second brightness enhancement films may be formed over the color conversion layer.

Displays with direct-lit backlight units

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.

Displays with direct-lit backlight units and color conversion layers

Displays with direct-lit backlight units including light-emitting diodes and encapsulant

An electronic device may include display layers such as liquid crystal display layers and a backlight unit that provides illumination for the display layers. The backlight unit may include light-emitting diodes that emit light into the edge of a light guide film. To minimize the inactive area of the display, the light-emitting diodes may be tightly spaced to approximate a line light source instead of point light sources. Color and/or luminance compensation layers may be incorporated at various locations within the backlight structures to ensure that the backlight provided to the display layers is homogenous. A thin-film transistor layer of the display may be coupled to a printed circuit board by a flexible printed circuit. The flexible printed circuit may have additional solder mask layers to improve robustness, may include encapsulation, and may have traces with a varying pitch.

Electronic device display with a backlight and control circuitry that corrects pixel data to reduce transition artifacts

Electronic device display with a backlight

Displays with direct-lit backlight units and light spreading structures

A display may have a backlight unit that provides backlight illumination. The backlight unit may include a light guide that distributes light through the display. Light-emitting diodes may emit light into the light guide. A reflector that is overlapped by the light guide may help reflect light upwards through an array of pixels. The backlight unit may have a chassis that receives the reflector, light guide, light-emitting diodes, and optical films such as diffusers and prism films. Optical and mechanical features in the backlight unit may enhance color and intensity uniformity for the backlight illumination and may help enhance durability.

Electronic devices with backlit displays

An electronic device has a display with a pixel array overlapping an array of temperature sensors. Control circuitry in the device may gather temperature measurements from the temperature sensor array. The control circuitry may apply a global offset to the temperature measurements and may apply a damping factor to the globally offset measurements to produce a two-dimensional temperature profile for the display. A look-up table or other data structure may be used to store information on pixel color correction gain values as a function of temperature. This temperature-gain information and temperature information from the two-dimensional temperature profile may be used by display circuitry in the device to display color-corrected images on the display.

Electronic devices with temperature-compensated displays

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Santa Clara, CA, United States of America

Daming Xu