Apple Inc.

Akshay Bhat

Giovanni Gozzini

Mohammad Yeke Yazdandoost

Anand K Chamakura

Meng-Huan Ho

Lun Tsai

Niva A Ran

Volodymyr Borshch

Yan Guan

Mahesh B Chappalli

David Andrew Doyle

Yifan Zhang

Jiayi Jin

Tingjun Xu

Tae-Wook Koh

Mahdi Nezamabadi

Jared S Price

Rui L Peterson

Michael H Lim

Kyung Hoae Koo

Ionut A Mirel

Wanglei Han

To mitigate undesirable outcomes due to crosstalk in an ambient light sensor reading resulting from light emission from an electronic display, statistics may be gathered to determine and compensate for the crosstalk. For example, the ambient light sensor may detect ambient light levels while the electronic display is temporarily paused to reduce or eliminate crosstalk between the light produced by the electronic display and the ambient light sensor. However, the ambient light sensor may retain charge from a previous light emission, creating back-emission crosstalk. The ratio of back-emission to front-emission (e.g., present light emission) may not be linear, and the degree of nonlinearity may vary with pixel value, color component, display brightness, temperature, and so on. As the ambient light sensor is affected by back-emission, compensation for the nonlinearity between the front-emission and the back-emission may be obtained to estimate the crosstalk induced on the ambient light sensor.

Systems and methods for crosstalk mitigation between ambient light sensor and electronic display

Systems and methods for detection of incident light are described. An optical imaging sensor is positioned at least partially within an active display area of a display and is configured to detect and characterize one or more properties of light incident to the active display area of the display.

Sensing system for detection of light incident to a light emitting layer of an electronic device display

A display may include pixels (such as light-emitting diode pixels) that are susceptible aging effects (burn-in). To help avoid visible artifacts caused by burn-in during operation of the display, compensation circuitry may be used to compensate image data for the display. An optical sensor may be included behind the pixels to directly measure pixel brightness levels. The optical sensor may provide optical sensor data from testing operations to the compensation circuitry. The optical sensor may gather data during burn-in testing operations. During the burn-in testing operations, pixel groups including both high-usage pixels and low-usage pixels may sequentially emit light while the optical sensor gathers data. Brightness differences between the high-usage pixels and low-usage pixels may be used to characterize pixel aging in the display and compensate image data to mitigate visible artifacts caused by burn-in. The optical sensor may also gather data during global brightness testing operations.

Display with optical sensor for brightness compensation

A color ambient light sensor may gather ambient light measurements during operation of an electronic device. The color ambient light sensor may have a color ambient light detector and an adjustable neutral density filter. The electronic device may have components such as a camera and display that are adjusted using ambient light information from the color ambient light sensor. The display may have a display cover layer. Pixels in an active area of the display may display images through the display cover layer. An inactive area of the display may have an opaque masking layer on an interior surface of the display cover layer. An opening in the opaque masking layer may form an ambient light sensor window for the color ambient light sensor. The adjustable neutral density filter may be interposed between the color ambient light detector and the ambient light sensor window.

Color ambient light sensor with adjustable neutral density filter

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Milpitas, CA, United States of America

Akshay Bhat