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公开(公告)号：US11276369B2
公开(公告)日：2022-03-15
申请号：US15948796
申请日：2018-04-09
申请人： Apple Inc.
发明人： Tobias Jung , Marc Albrecht , Paul S. Drzaic , Tae-Wook Koh , Teun R. Baar , Yifan Zhang , Ramin Samadani , Nicolas P. Bonnier
摘要： Systems, methods, and devices are provided to reduce a likelihood of image burn-in on an electronic display. Such an electronic device may include image processing circuitry and an electronic display. The image processing circuitry may receive image data and analyze the image data for risk of image burn-in and, based at least in part on the analysis of the image data, reduce a risk of image burn-in at least in part by reducing a local maximum pixel luminance value in at least one of a plurality of regions of the image data over time or by reducing a dynamic range headroom of the image data. The electronic display may display the image data with a reduced risk of image burn-in on the pixels of the electronic display.
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公开(公告)号：US20200105171A1
公开(公告)日：2020-04-02
申请号：US16196794
申请日：2018-11-20
申请人： Apple Inc.
摘要： 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.
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公开(公告)号：US10460702B2
公开(公告)日：2019-10-29
申请号：US15691687
申请日：2017-08-30
申请人： Apple Inc.
发明人： Nachum M. Kanovsky , Marc Albrecht , Tobias Jung , Xiaokai Li , Ameya Y. Joshi
摘要： Aspects of the subject technology relate to display circuitry including pixel overdrive circuitry. The pixel overdrive circuitry includes a compression engine that compresses a previous display frame, for storage and comparison to a current display frame without compression or decompression of the current display frame. The compression engine compresses the previous frame in such a way that the maximum compression error is always known and can be used to determine whether to perform overdrive operations for the current frame without compressing and decompressing the current display frame. The compression engine selects gradient encoding or decimation encoding for the compression of the previous display frame and can perform successive decimation operations within the gradient encoding operations to help reduce the size of the compressed previous frame while maintaining the quality of the ultimate overdriven current frame.
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公开(公告)号：US20190325816A1
公开(公告)日：2019-10-24
申请号：US16374606
申请日：2019-04-03
申请人： Apple Inc.
发明人： Hung Sheng Lin , Shengkui Gao , Yingying Tang , Sean C. Chang , Mohammad B. Vahid Far , Kasra M. Omid-Zohoor , Chumin Zhao , Jingyu Huang , Mohammad Ali Jangda , Hyunwoo Nho , Chaohao Wang , Marc J. DeVincentis , Marc Albrecht , Warren S. Rieutort-Louis
IPC分类号： G09G3/3208 , G09G3/20
摘要： Systems and methods reduce likelihood of hysteresis that reduces perceived image quality of a subsequent image frame by toggling the display pixels to relax the display pixels by overwriting previous image frame data. During non-emission periods of the pixels, the pixels may be pre-toggled or exercised to improve response time and accuracy of the pixel. Data for pixels being programmed may also be used to pre-toggle other pixels reducing overhead but increasing cross-talk. Since the amount of cross-talk is related to content of the pixels being pre-toggled, a line buffer may be used to store image data for the pixels being pre-toggled. This stored image data may be used to determine how much pre-compensation is to be applied to data for the pixels being programmed. In other words, an amount of compensation applied is based at least in part on the content (e.g., greyscale levels) of the image data.
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公开(公告)号：US10319279B2
公开(公告)日：2019-06-11
申请号：US15438448
申请日：2017-02-21
申请人： Apple Inc.
发明人： Chaohao Wang , Paolo Sacchetto , Sheng Zhang , Yang Li , Myung-Je Cho , Marc Albrecht
IPC分类号： G09G3/20
摘要： This application relates to performing certain dithering processes to eliminate display artifacts such as flicker, which can be caused by charge accumulation at the display. The dither process can be performed by a display controller that uses a group lookup method for identifying groups of dithering patterns that can be combined to expand a number of color values available to the display. The dither process can also be performed as a temporal process that incorporates groups of dithering patterns into frames and shifts a spatial arrangement of the groups of dithering patterns over a sequence of frames. Additionally, the dither process can incorporate counters that count the number of times a particular spatial arrangement of dithering patterns has been used in a sequence of frames in order that each spatial arrangement of dithering patterns will share an average count with other spatial arrangements over a sequence of frames.
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公开(公告)号：US20190005898A1
公开(公告)日：2019-01-03
申请号：US15907097
申请日：2018-02-27
申请人： Apple Inc.
发明人： Marc Albrecht , Teun R. Baar , Nicolas P. Bonnier , Sean Chang , ByoungSuk Kim , David S. Zalatimo
CPC分类号： G09G3/3426 , G06F1/1643 , G09G2320/0285 , G09G2320/0606 , G09G2320/0626 , G09G2320/0633 , G09G2320/064 , G09G2360/144
摘要： An electronic device may be provided with a display. The display may include a backlight having an array of locally dimmable light sources. Control circuitry may provide control signals to the backlight to produce light at different brightness levels. When the brightness level is below a threshold, the control circuitry may use pulse-width-modulation control signals to control the light sources in the backlight. When the brightness level is above the brightness threshold, the control circuitry may use analog control signals to control the light sources in the backlight. The control circuitry may adjust the threshold to achieve different dimming ranges for different brightness settings. A low brightness setting, for example, may have a lower threshold and lower dimming range than a high brightness setting, which may help produce darker darks when the display operates in a low brightness setting.
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公开(公告)号：US09922608B2
公开(公告)日：2018-03-20
申请号：US14722620
申请日：2015-05-27
申请人： Apple Inc.
发明人： Chaohao Wang , Brijesh Tripathi , Christopher Philip Alan Tann , David S. Zalatimo , Guy Cote , Hao Nan , Marc Albrecht , Paolo Sacchetto , Sandro H. Pintz
IPC分类号： G09G3/36
CPC分类号： G09G3/3614 , G09G2320/0204 , G09G2320/0247 , G09G2320/0257 , G09G2320/046 , G09G2340/0435 , G09G2360/16
摘要： 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.
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公开(公告)号：US20180075798A1
公开(公告)日：2018-03-15
申请号：US15661995
申请日：2017-07-27
申请人： Apple Inc.
发明人： Hyunwoo Nho , Hung Sheng Lin , Jie Won Ryu , Junhua Tan , Sun-Il Chang , Shengkui Gao , Rui Zhang , Injae Hwang , Kingsuk Brahma , Jesse Aaron Richmond , Shiping Shen , Hyunsoo Kim , Sebastian Knitter , Lu Zhang , Nicolas P. Bonnier , Chih-Wei Yeh , Chaohao Wang , Paolo Sacchetto , Chin-Wei Lin , Mohammad B Vahid Far , Shinya Ono , Yafei Bi , Majid Gharghi , Kavinaath Murugan , Yun Wang , Derek K. Shaeffer , Baris Cagdaser , Tobias Jung , Marc Albrecht , Myung-Je Cho
IPC分类号： G09G3/32
CPC分类号： G09G3/32 , G09G3/3233 , G09G2320/0233 , G09G2320/0285 , G09G2320/029 , G09G2320/0295 , G09G2320/041 , G09G2320/043 , G09G2320/045 , G09G2320/0626
摘要： A mobile electronic device includes a display having a pixel and processing circuitry separate from but communicatively coupled to the display. The processing circuitry prepares image data to send to the pixel and adjusts the image data to compensate for operational variations of the display based on feedback received from the display that describes a present operational behavior of the pixel. The mobile electronic device also includes additional electronic components that affect the present operational behavior of the pixel depending on present operational behavior of the additional electronic components.
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公开(公告)号：US09620064B2
公开(公告)日：2017-04-11
申请号：US14059329
申请日：2013-10-21
申请人： Apple Inc.
发明人： Marc Albrecht , Christopher Philip Alan Tann , Nicholas G. Roland , Sandro H. Pintz , Taesung Kim
CPC分类号： G09G3/3406 , G09G3/2007 , G09G2320/0242 , G09G2320/0276 , G09G2320/0285 , G09G2320/0626 , G09G2320/103 , G09G2330/021 , G09G2340/0435
摘要： A method and system are provided for compensating for brightness changes in a display having an array of display pixels. The method includes storing a plurality of look-up tables, where each table has a plurality of brightness signals that provide compensation for a brightness change when the refresh rate is changed during a panel self-refresh. The method also includes using display control circuitry to determine the refresh rate associated with an input signal and to determine a compensation based on the refresh rate. The display control circuitry may, for example, use non-linear interpolation to generate a look-up table for the refresh rate. The display control circuitry may adjust the input signal based on the look-up table to produce an output signal that compensates for a brightness change at the refresh rate. The output signal may be transmitted to the array of display pixels.
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公开(公告)号：US20140198138A1
公开(公告)日：2014-07-17
申请号：US14155297
申请日：2014-01-14
申请人： Apple Inc.
发明人： Prasanna Nambi , Jason N. Gomez , Fenghua Zheng , Paolo Sacchetto , Sandro H. Pintz , Taesung Kim , Christopher P. Tann , Marc Albrecht , David W. Lum
IPC分类号： G09G3/36
CPC分类号： G09G3/3618 , G06T1/20 , G06T2210/52 , G09G3/36 , G09G3/3611 , G09G3/3648 , G09G3/3655 , G09G3/3696 , G09G2310/08 , G09G2320/0626 , G09G2330/02 , G09G2330/021 , G09G2340/0435 , G09G2360/18 , G09G2370/08
摘要： 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.
摘要翻译： 本公开描述了在诸如膝上型计算机，平板计算机，移动电话或音乐播放器设备的消费电子设备的LCD显示器上动态地采用可变刷新率的过程。 在一些配置中，消费电子设备可以包括具有一个或多个处理器的主机系统部分和具有定时控制器，缓冲电路，显示驱动器和显示面板的显示系统部分。 显示系统可以从主机系统的GPU接收图像数据和图像控制数据，评估所接收的图像控制数据，以确定在显示面板上使用的刷新率降低（RRR），然后在切实可行的情况下转换到RRR ，以节省权力。 在某些情况下，过渡到RRR可以是从50赫兹或更高的LRR到40赫兹或更低的RRR的转换。
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