公开(公告)号：US10665141B2

公开(公告)日：2020-05-26

申请号：US16196794

申请日：2018-11-20

Applicant: Apple Inc.

Inventor： Kenneth I. Greenebaum ,  Robert L. Ridenour ,  Marc Albrecht

IPC: G06T3/40 ,  G09G3/00 ,  G06T5/00 ,  G06T7/70

Abstract: Source content super-sampled to a first resolution in an extended range space is obtained. A representation of a subpixel geometry of a display panel displaying the source content is obtained. The display panel includes, for every pixel, plural subpixel elements for three or more color primaries. A native resolution of the display panel is lower than the first resolution of the source content. An optimization operation is performed based on a set mode of the display panel and the representation of the subpixel geometry to derive a global optimization for determining, for a given pixel value based on the source content, an energy distribution between the plurality of subpixel elements of a corresponding pixel of the display panel. The source content in the extended range space is converted into intermediate content in a display space based on the global optimization. The intermediate content is further optimized based on error minimization.

公开(公告)号：US10600379B2

公开(公告)日：2020-03-24

申请号：US16103852

申请日：2018-08-14

Applicant: Apple Inc.

Inventor： Prasanna Nambi ,  Jason N. Gomez ,  Fenghua Zheng ,  Paolo Sacchetto ,  Sandro H. Pintz ,  Taesung Kim ,  Christopher P. Tann ,  Marc Albrecht ,  David W. Lum

IPC: G09G3/36 ,  G06T1/20

Abstract: The disclosure describes procedures for dynamically employing a variable refresh rate at an LCD display of a consumer electronic device, such as a laptop computer, a tablet computer, a mobile phone, or a music player device. In some configurations, the consumer electronic device can include a host system portion, having one or more processors and a display system portion, having a timing controller, a buffer circuit, a display driver, and a display panel. The display system can receive image data and image control data from a GPU of the host system, evaluate the received image control data to determine a reduced refresh rate (RRR) for employing at the display panel, and then transition to the RRR, whenever practicable, to conserve power. In some scenarios, the transition to the RRR can be a transition from a LRR of 50 hertz or above to a RRR of 40 hertz or below.

公开(公告)号：US10535287B2

公开(公告)日：2020-01-14

申请号：US15275374

申请日：2016-09-24

Applicant: Apple Inc.

Inventor： Chaohao Wang ,  Lu Zhang ,  Zhibing Ge ,  Shih-Chyuan Fan Jiang ,  Ilie Garbacea ,  Marc Albrecht ,  Kingsuk Brahma ,  Hopil Bae ,  Paolo Sacchetto ,  Jie Won Ryu ,  Sandro H. Pintz ,  Chengrui Le

IPC: G09G3/34 ,  G09G3/3258 ,  G09G3/36 ,  G09G3/20

Abstract: Systems and methods are provided for improving displayed image quality of an electronic display that includes a display pixel. The electronic display displays a first image frame directly after a second image frame by applying an analog electrical signal to the display pixel. To facilitate display of the first image frame, circuitry receives image data corresponding to the image frame, in which the image data includes a grayscale value that indicates target luminance of the display pixel; determines expected refresh rate of the first image frame based at least in part on actual refresh rate of the second image frame; determines a pixel response correction offset based at least in part on the expected refresh rate of the first image frame; and determines processed image data by applying the pixel response correction offset to the grayscale value, in which the processed image data indicates magnitude of the analog electrical signal.

公开(公告)号：US10467982B2

公开(公告)日：2019-11-05

申请号：US15658312

申请日：2017-07-24

Applicant: Apple Inc.

Inventor： Mahnaz Mohammadi ,  Adria Fores Herranz ,  Marc Albrecht ,  Alexander P. Yu ,  Ross Thompson ,  Daming Xu ,  Suraj P. Gorkhali ,  Heesang Suh ,  Mookyung Son ,  Victor H. Yin ,  Judith C. Segura ,  Mingkun Li ,  Jay Mayur Khandhar

IPC: G09G5/04 ,  G09G5/06 ,  G01K13/00 ,  G01K1/02 ,  G09G3/20 ,  G09G3/36 ,  F21V8/00

Abstract: 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.

公开(公告)号：US10403192B2

公开(公告)日：2019-09-03

申请号：US15655591

申请日：2017-07-20

Applicant: APPLE INC.

Inventor： Marc Albrecht ,  Mahesh B. Chappalli ,  Christopher P. Tann ,  Jim C. Chou ,  Guy Cote

IPC: G09G3/20 ,  G09G3/32 ,  G09G3/36 ,  G09G3/3208

Abstract: Devices and methods for error diffusion and spatiotemporal dithering are provided. By way of example, a method of operating a display includes receiving a pixel input, a set of pixel coordinates, and a current frame number. A kernel and a particular kernel bit of the kernel is selected from a set of kernels, based upon the pixel input, the pixel coordinates, the frame number, or any combination thereof. A dithered output is determined based at least in part upon the kernel bit. When the display is in a diamond pixel configuration, the dithered output is applied in accordance with a diamond pattern formed by red, blue, or red and blue pixel channels.

公开(公告)号：US20180330674A1

公开(公告)日：2018-11-15

申请号：US15814262

申请日：2017-11-15

Applicant: Apple Inc.

Inventor： Teun R. Baar ,  Nicolas P. Bonnier ,  Jiaying Wu ,  Marc Albrecht

IPC: G09G3/34 ,  H05B37/02 ,  G06T11/00 ,  G06T5/00

CPC classification number: G09G3/3406 ,  G06T5/009 ,  G06T11/001 ,  G09G2320/0242 ,  G09G2320/0271 ,  G09G2320/0626 ,  G09G2320/0666 ,  G09G2330/021 ,  G09G2330/045 ,  G09G2360/144 ,  G09G2360/16 ,  H05B33/086 ,  H05B37/0218

Abstract: An electronic device may be provided with a display. Standard and high dynamic range content may be produced by content generators operating on control circuitry. In a first mode of operation, standard dynamic range content is displayed. In a second mode of operation, high dynamic range content is displayed. In a third mode of operation, standard dynamic range content and high dynamic range content are simultaneously displayed. Tone mapping parameters may be produced by a tone mapping engine for use in displaying the standard and high dynamic range content. The tone mapping parameters may be selected based on factors such as ambient light level, user brightness setting, content statistics, and display characteristics. Tone mapping parameters may be selected to accommodate simultaneous display of standard and high dynamic range content and to accommodate transitions between standard and high dynamic range content.

公开(公告)号：US20180286349A1

公开(公告)日：2018-10-04

申请号：US15658312

申请日：2017-07-24

Applicant: Apple Inc.

Inventor： Mahnaz Mohammadi ,  Adria Fores Herranz ,  Marc Albrecht ,  Alexander P. Yu ,  Ross Thompson ,  Daming Xu ,  Suraj P. Gorkhali ,  Heesang Suh ,  Mookyung Son ,  Victor H. Yin ,  Judith C. Segura ,  Mingkun Li ,  Jay Mayur Khandhar

IPC: G09G5/04 ,  G09G5/06 ,  G01K13/00

CPC classification number: G09G5/04 ,  G01K1/026 ,  G01K13/00 ,  G02B6/004 ,  G09G3/20 ,  G09G3/3607 ,  G09G5/06 ,  G09G2300/0452 ,  G09G2320/0242 ,  G09G2320/0285 ,  G09G2320/041 ,  G09G2320/0666 ,  G09G2320/0693

Abstract: 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.

公开(公告)号：US20180166032A1

公开(公告)日：2018-06-14

申请号：US15890517

申请日：2018-02-07

Applicant: Apple Inc.

Inventor： Chaohao Wang ,  Brijesh Tripathi ,  Christopher Philip Alan Tann ,  David S. Zalatimo ,  Guy Cote ,  Hao Nan ,  Marc Albrecht ,  Paolo Sacchetto ,  Sandro H. Pintz

IPC: G09G3/36

CPC classification number: G09G3/3614 ,  G09G2320/0204 ,  G09G2320/0247 ,  G09G2320/0257 ,  G09G2320/046 ,  G09G2340/0435 ,  G09G2360/16

Abstract: An electronic device may generate content that is to be displayed on a display. The display may have an array of liquid crystal display pixels for displaying image frames of the content. The image frames may be displayed with positive and negative polarities to help reduce charge accumulation effects. A charge accumulation tracker may analyze the image frames to determine when there is a risk of excess charge accumulation. The charge accumulation tracker may analyze information on gray levels, frame duration, and frame polarity. The charge accumulation tracker may compute a charge accumulation metric for entire image frames or may process subregions of each frame separately. When subregions are processed separately, each subregion may be individually monitored for a risk of excess charge accumulation.

公开(公告)号：US09984608B2

公开(公告)日：2018-05-29

申请号：US14986181

申请日：2015-12-31

Applicant: Apple Inc.

Inventor： Paolo Sacchetto ,  Christopher P. Tann ,  Taesung Kim ,  Sandro H. Pintz ,  Marc Albrecht ,  Chaohao Wang ,  David S. Zalatimo ,  Fenghua Zheng ,  Zhibing Ge

IPC: G09G3/20 ,  G09G3/36 ,  H04N1/60 ,  H04N9/73

CPC classification number: G09G3/20 ,  G09G2310/0254 ,  G09G2310/063 ,  G09G2310/08 ,  G09G2320/0204 ,  G09G2340/0435

Abstract: System and method for improving displayed image quality of an electronic display that displays a first image frame by applying a first voltage to a display pixel and a second image frame directly before the first image frame by applying a second voltage to the display pixel. A display pipeline is communicatively coupled to the electronic display and receives first image data corresponding with the first image frame, where the image data includes a first grayscale value corresponding with the display pixel. Additionally the display pipeline determines an inversion balancing grayscale offset based at least in part on the first grayscale value when polarity of the first voltage and polarity of the second voltage are the same and determines magnitude of the first voltage by applying the inversion balancing grayscale offset to the first grayscale value to reduce likelihood of a perceivable luminance spike when displaying the first image frame.

公开(公告)号：US09952642B2

公开(公告)日：2018-04-24

申请号：US14500646

申请日：2014-09-29

Applicant: APPLE INC.

Inventor： Chaohao Wang ,  Louis Luh ,  Jun Qi ,  Cheng Chen ,  Jun Jiang ,  Paolo Sacchetto ,  Marc Albrecht

IPC: G09G3/20 ,  G06F1/32 ,  G09G5/00

CPC classification number: G06F1/32 ,  G09G5/003 ,  G09G2320/0247 ,  G09G2330/021 ,  G09G2340/0435 ,  G09G2360/16

Abstract: Systems and methods for operating a display by dynamically determining a refresh rate for the display. In certain implementations, a processor determines a number of pixels having medium grayscale levels from a histogram for the image. If the number does not exceed a threshold, the processor sets a refresh rate for the display to a first refresh rate. In certain implementations, if the number exceeds a threshold, the processor may set the refresh rate for the display to a second refresh rate. Moreover, the first refresh rate may be lower than the second threshold. In some implementations, the image may be analyzed by subdividing the image into blocks and determining a refresh rate based on grayscale levels or distributions in the blocks. Based on the analysis of the blocks, a corresponding refresh rate may be selected.