Patents by Inventor Suraj P. Gorkhali
Suraj P. Gorkhali has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11804187Abstract: An electronic device may include a display having an array of pixels and a backlight that provides backlight illumination for the array of pixels. The backlight may be a direct-lit backlight with a two-dimensional array of light-emitting diodes operable in a local dimming scheme. The electronic device may include control circuitry that provides pixel signals to the array of pixels and backlight signals to the backlight. The control circuitry may adjust the pixel signals and the backlight signals to compensate for brightness and color non-uniformity in the backlight. To compensate for image-dependent backlight non-uniformity, the control circuitry may simulate artificial backlight data based on the target image to be displayed and stored point spread information. To compensate for white-point-dependent backlight non-uniformity, the control circuitry may use measured actual backlight data that describes color variations across the backlight for a given target white point.Type: GrantFiled: June 24, 2022Date of Patent: October 31, 2023Assignee: Apple Inc.Inventors: Fang-Cheng Lin, Chengrui Le, Yi-Pai Huang, Suraj P Gorkhali, Tobias Jung, He Li, Yansong Liu
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Publication number: 20220415271Abstract: An electronic device may include a display having an array of pixels and a backlight that provides backlight illumination for the array of pixels. The backlight may be a direct-lit backlight with a two-dimensional array of light-emitting diodes operable in a local dimming scheme. The electronic device may include control circuitry that provides pixel signals to the array of pixels and backlight signals to the backlight. The control circuitry may adjust the pixel signals and the backlight signals to compensate for brightness and color non-uniformity in the backlight. To compensate for image-dependent backlight non-uniformity, the control circuitry may simulate artificial backlight data based on the target image to be displayed and stored point spread information. To compensate for white-point-dependent backlight non-uniformity, the control circuitry may use measured actual backlight data that describes color variations across the backlight for a given target white point.Type: ApplicationFiled: June 24, 2022Publication date: December 29, 2022Inventors: Fang-Cheng Lin, Chengrui Le, Yi-Pai Huang, Suraj P Gorkhali, Tobias Jung, He Li, Yansong Liu
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Patent number: 11526051Abstract: 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.Type: GrantFiled: August 23, 2021Date of Patent: December 13, 2022Assignee: Apple Inc.Inventors: Daming Xu, Wei Lv, Pee Khiam So, Wenyong Zhu, Rong Liu, Victor H. Yin, Mookyung Son, Jun Qi, Yufeng Yan, Shaofeng Liu, Thomas O. Henry, Suraj P. Gorkhali
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Publication number: 20220334431Abstract: 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.Type: ApplicationFiled: August 23, 2021Publication date: October 20, 2022Inventors: Daming Xu, Wei Lv, Pee Khiam So, Wenyong Zhu, Rong Liu, Victor H. Yin, Mookyung Son, Jun Qi, Yufeng Yan, Shaofeng Liu, Thomas O. Henry, Suraj P. Gorkhali
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Patent number: 11221512Abstract: 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.Type: GrantFiled: March 6, 2019Date of Patent: January 11, 2022Assignee: Apple Inc.Inventors: Rong Liu, Daming Xu, Jun Qi, Ling Han, Mookyung Son, Chenhua You, Victor H. Yin, Xinyu Zhu, Heesang Suh, Juan He, Joshua A. Spechler, Zhenyue Luo, Suraj P. Gorkhali
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Patent number: 10901260Abstract: 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.Type: GrantFiled: March 6, 2019Date of Patent: January 26, 2021Assignee: Apple Inc.Inventors: Rong Liu, Jun Qi, Victor H. Yin, Wei Lv, Joshua A. Spechler, Yu P. Sun, Suraj P. Gorkhali, Daming Xu, Edward H. Kang, Wenyong Zhu, Ziruo Hong, Xinyu Zhu, Ling Han, Mookyung Son, Pee Khiam So, Janos C. Keresztes, Chenhua You, Zhenyue Luo, Heesang Suh, Juan He, Hung Sheng Lin
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Patent number: 10866458Abstract: 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.Type: GrantFiled: June 12, 2019Date of Patent: December 15, 2020Assignee: Apple Inc.Inventors: Shin-Ying Lu, Daming Xu, Suraj P. Gorkhali, Adria Fores Herranz, Mookyung Son, Heesang Suh, Victor H. Yin, Aaron L. Holsteen, Xiaokai Li, Zhibing Ge
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Patent number: 10802336Abstract: 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.Type: GrantFiled: March 6, 2019Date of Patent: October 13, 2020Assignee: Apple Inc.Inventors: Rong Liu, Ling Han, Daming Xu, Janos C. Keresztes, Joshua A. Spechler, Jun Qi, Victor H. Yin, Yu P. Sun, Ziruo Hong, Wei Lv, Suraj P. Gorkhali, Mookyung Son
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Publication number: 20200133068Abstract: 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.Type: ApplicationFiled: June 12, 2019Publication date: April 30, 2020Inventors: Shin-Ying Lu, Daming Xu, Suraj P. Gorkhali, Adria Fores Herranz, Mookyung Son, Heesang Suh, Victor H. Yin, Aaron L. Holsteen, Xiaokai Li, Zhibing Ge
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Patent number: 10467982Abstract: 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.Type: GrantFiled: July 24, 2017Date of Patent: November 5, 2019Assignee: Apple Inc.Inventors: 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
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Publication number: 20190285943Abstract: 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.Type: ApplicationFiled: March 6, 2019Publication date: September 19, 2019Inventors: Rong Liu, Daming Xu, Jun Qi, Ling Han, Mookyung Son, Chenhua You, Victor H. Yin, Xinyu Zhu, Heesang Suh, Juan He, Joshua A. Spechler, Zhenyue Luo, Suraj P. Gorkhali
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Publication number: 20190285941Abstract: 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.Type: ApplicationFiled: March 6, 2019Publication date: September 19, 2019Inventors: Rong Liu, Ling Han, Daming Xu, Janos C. Keresztes, Joshua A. Spechler, Jun Qi, Victor H. Yin, Yu P. Sun, Ziruo Hong, Wei Lv, Suraj P. Gorkhali, Mookyung Son
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Publication number: 20190285944Abstract: 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.Type: ApplicationFiled: March 6, 2019Publication date: September 19, 2019Inventors: Rong Liu, Jun Qi, Victor H. Yin, Wei Lv, Joshua A. Spechler, Yu P. Sun, Suraj P. Gorkhali, Daming Xu, Edward H. Kang, Wenyong Zhu, Ziruo Hong, Xinyu Zhu, Ling Han, Mookyung Son, Pee Khiam So, Janos C. Keresztes, Chenhua You, Zhenyue Luo, Heesang Suh, Juan He, Hung Sheng Lin
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Publication number: 20180286349Abstract: 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.Type: ApplicationFiled: July 24, 2017Publication date: October 4, 2018Inventors: 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