Patents by Inventor Kwang Soon Park

Kwang Soon Park 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).

  • Publication number: 20210364854
    Abstract: A pixel array may be illuminated with backlight illumination from a backlight. The backlight may include a two-dimensional array of light-emitting diodes, with each light-emitting diode being placed in a respective cell. Different light-emitting diodes may have unique brightness magnitudes based on the content of the given display frame. Driver integrated circuits may control one or more associated light-emitting diodes to have a desired brightness level. The driver integrated circuits may be formed in an active area of the backlight. The driver integrated circuits may be arranged in groups that are daisy chained together. A digital signal (that includes information such as addressing information) may be propagated through the group of driver integrated circuits. To manage thermal performance of the backlight, the backlight may include a thermally conductive layer and/or a heat sink structure. To increase the efficiency of the backlight, the backlight may include one or more reflective layers.
    Type: Application
    Filed: March 16, 2021
    Publication date: November 25, 2021
    Inventors: David W. Lum, Kyung Wook Kim, Kwang Soon Park, Mingxia Gu, Jun Qi
  • Patent number: 10923012
    Abstract: An electronic device may include a display. The display may include display driver circuitry that is configured to provide image data to columns of pixels and gate driver circuitry that is configured to provide control signals to rows of pixels. The display may be operable at a native refresh rate that is equal to the highest refresh rate at which the display has full resolution. The display may also be operable in a high refresh rate mode with a high refresh rate that is twice (or some other scaling factor greater than) the native refresh rate. To enable operation at the high refresh rate mode, vertical resolution of the display may be sacrificed. In other words, rows of pixels may be grouped together into effective rows that are then scanned in sequence. The gate driver circuitry may be formed as thin-film transistor circuitry or from gate driver integrated circuits.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: February 16, 2021
    Assignee: Apple Inc.
    Inventors: Jiaxi Hu, Hao-Lin Chiu, Shatam Agarwal, Kwang Soon Park, Joonggun Lee, Kyung Wook Kim, Shih Chang Chang, Fenghua Zheng
  • Patent number: 10754212
    Abstract: A display may have pixels configured to display images. The pixels may be formed from thin-film transistor circuitry on a substrate. Color filter elements formed from colored polymer such as colored photoimageable polymer may be formed on the substrate. A black matrix formed from black photoimageable polymer may have an array of openings. The colored polymer may have first portions that overlap the black matrix and second portions in the openings that form the color filter elements. In some portions of the pixels, the thin-film transistor circuitry may be interposed between the first portions of the colored polymer and the black matrix. In other portions of the pixels, data lines may be formed that are overlapped by the black matrix and that are interposed between the first portions of the colored polymer and the black matrix.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: August 25, 2020
    Assignee: Apple Inc.
    Inventors: Byung Duk Yang, Hao-Lin Chiu, Kwang Soon Park, Kyung Wook Kim, Sai-Chang Liu, Shih Chang Chang
  • Patent number: 10354607
    Abstract: A display may have an array of pixels. Rows of pixels may receive gate line signals over gate lines. Display driver circuitry may have an adjustable clock generator that generates a series of clock pulses with different respective fall times to help equalize kickback voltages in the pixels of different rows. Within each row, gate lines may be provided with multiple parallel lines shorted at a series of tap points to help equalize kickback voltages across the pixels of different columns. A clock path may be formed between the clock generator and gate driver circuits. The clock path may run along an edge of the array of pixels. To help equalize kickback voltages in the pixels of different rows, the clock path may have first and second parallel metal lines that are selectively shorted to each other at a series of tap point locations along the clock path.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: July 16, 2019
    Assignee: Apple Inc.
    Inventors: Kwang Soon Park, Pei-En Chang, Szu-Hsien Lee
  • Patent number: 10288963
    Abstract: A display may have an array of pixels arranged in rows and columns. Display driver circuitry may be provided along an edge of the display. Data lines that are associated with columns of the pixels may be used to distribute data from the display driver circuitry to the pixels. Gate lines in the display may each have a horizontal straight portion that extends along a respective row of the pixels and may each have one or more non-horizontal segments such as zigzag segments. The non-horizontal portion of each gate line may be connected to the horizontal straight portion of the gate line by a via. The non-horizontal portions may each have portions that are overlapped by portions of the data lines. Dummy gate line structures may be provided on the display that are not coupled to any of the pixels in the display.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: May 14, 2019
    Assignee: Apple Inc.
    Inventors: Patrick B. Bennett, Kwang Soon Park, Chun-Yao Huang, Byung Duk Yang, Shih Chang Chang
  • Publication number: 20190086720
    Abstract: A display may have pixels configured to display images. The pixels may be formed from thin-film transistor circuitry on a substrate. Color filter elements formed from colored polymer such as colored photoimageable polymer may be formed on the substrate. A black matrix formed from black photoimageable polymer may have an array of openings. The colored polymer may have first portions that overlap the black matrix and second portions in the openings that form the color filter elements. In some portions of the pixels, the thin-film transistor circuitry may be interposed between the first portions of the colored polymer and the black matrix. In other portions of the pixels, data lines may be formed that are overlapped by the black matrix and that are interposed between the first portions of the colored polymer and the black matrix.
    Type: Application
    Filed: July 20, 2018
    Publication date: March 21, 2019
    Inventors: Byung Duk Yang, Hao-Lin Chiu, Kwang Soon Park, Kyung Wook Kim, Sai-Chang Liu, Shih Chang Chang
  • Patent number: 10170072
    Abstract: A display device may include pixels and source lines that provide data line signals to the pixels. The display device may also include gate lines that provide gate signals to switches associated with the pixels. The display device may also include vertical gate lines disposed generally parallel to the source lines and coupled to the gate lines at cross point nodes. The display device may also include compensation lines, such that each compensation line is proximate to a respective vertical gate line. The compensation lines may transmit compensation signals having an opposite polarity as compared to respective gate signals to reduce or eliminate a kickback voltage on at least one of the plurality of pixels.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: January 1, 2019
    Assignee: Apple Inc.
    Inventors: Byung Duk Yang, Chun-Yao Huang, Kyung Wook Kim, Patrick B. Bennett, Shih Chang Chang, Wonjae Choi, Hao-Lin Chiu, Kwang Soon Park, Xinyu Zhu
  • Publication number: 20180308445
    Abstract: A display may have an array of pixels. Rows of pixels may receive gate line signals over gate lines. Display driver circuitry may have an adjustable clock generator that generates a series of clock pulses with different respective fall times to help equalize kickback voltages in the pixels of different rows. Within each row, gate lines may be provided with multiple parallel lines shorted at a series of tap points to help equalize kickback voltages across the pixels of different columns. A clock path may be formed between the clock generator and gate driver circuits. The clock path may run along an edge of the array of pixels. To help equalize kickback voltages in the pixels of different rows, the clock path may have first and second parallel metal lines that are selectively shorted to each other at a series of tap point locations along the clock path.
    Type: Application
    Filed: August 23, 2017
    Publication date: October 25, 2018
    Inventors: Kwang Soon Park, Pei-En Chang, Szu-Hsien Lee
  • Patent number: 9847070
    Abstract: A display may have an array of pixels to display images. Gate line driver circuitry may have stages that supply gate line signals. A gate line may be located in each row of the pixels. Each stage may have an output block that produces a respective one of the gate line signals and may have a carry block that separately produces a carry signal that is provided to a later stage in the gate line driver circuitry. A memory may be provided in at least some of the stages to store signals produced by the output blocks during intraframe pausing operations. At the end of an intraframe pause, the stored signals may be used in restarting production of the gate line signals by output blocks in the gate line driver stages. Circuitry may be used to separately reset the output block and suppress carry signal production by the carry block.
    Type: Grant
    Filed: October 22, 2014
    Date of Patent: December 19, 2017
    Assignee: Apple Inc.
    Inventors: Kwang Soon Park, Chun-Yao Huang, Shih Chang Chang
  • Patent number: 9841644
    Abstract: A liquid crystal display having an outer layer such as a thin-film transistor layer and an inner layer such as a color filter layer may be mounted in a metal device housing. Transparent conductive coating material may be formed on display layers. The transparent conductive coating material may include a layer on the upper surface of the thin-film transistor layer, a layer on the lower surface of the color filter layer, and an edge coating that extends between the upper surface layer and lower surface layer. Electrostatic discharge protection structures for the display may include a conductive elastomeric gasket that couples the upper surface layer to an inner surface of the housing, a conductive tape that couples the lower surface layer to the inner surface, and a conductive material on the inner surface that contacts the edge coating.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: December 12, 2017
    Assignee: Apple Inc.
    Inventors: Kwang Soon Park, Byung Duk Yang, Kyung-Wook Kim, Shih-Chang Chang, Yong Kwan Kim
  • Publication number: 20170307950
    Abstract: A display may have an array of pixels arranged in rows and columns. Display driver circuitry may be provided along an edge of the display. Data lines that are associated with columns of the pixels may be used to distribute data from the display driver circuitry to the pixels. Gate lines in the display may each have a horizontal straight portion that extends along a respective row of the pixels and may each have one or more non-horizontal segments such as zigzag segments. The non-horizontal portion of each gate line may be connected to the horizontal straight portion of the gate line by a via. The non-horizontal portions may each have portions that are overlapped by portions of the data lines. Dummy gate line structures may be provided on the display that are not coupled to any of the pixels in the display.
    Type: Application
    Filed: July 6, 2017
    Publication date: October 26, 2017
    Inventors: Patrick B. Bennett, Kwang Soon Park, Chun-Yao Huang, Byung Duk Yang, Shih Chang Chang
  • Patent number: 9760823
    Abstract: A display may have an active area surrounded by an inactive border area. The display may be a liquid crystal display having a liquid crystal layer sandwiched between a color filter layer and a thin-film transistor layer. An upper polarizer may have a polarized central region that overlaps the active area of the display. The upper polarizer may also have an unpolarized portion in the inactive border area overlapping the border structures. The border structures may include colored material such as a white layer on the inner surface of the thin-film transistor layer. Binary information may be embedded into an array of programmable resonant circuits. The binary information may be a display identifier or other information associated with a display. The programmable resonant circuits may be tank circuits with adjustable capacitors, fuses, or other programmable components.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: September 12, 2017
    Assignee: Apple Inc.
    Inventors: Byung Duk Yang, Kwang Soon Park, Enkhamgalan Dorjgotov, Kyung Wook Kim, Shih Chang Chang
  • Patent number: 9678371
    Abstract: A display may have an array of pixels controlled by display driver circuitry. The display driver circuitry may supply the pixels with data signals over data lines in columns of the pixels and may supply the pixels with gate line signals over gate lines in rows of the pixels. The display driver circuitry may have a display driver integrated circuit located on one of the edges of the display. The display driver circuitry may also have gate driver integrated circuits that extend along opposing edges of the display to form a pair of shift registers. Conductive lines in a display substrate may be coupled to opposing ends of the shift registers and to intermediate locations within the shift registers to minimize delays in distributing a gate high voltage signal from the display driver integrated circuit to the shift registers.
    Type: Grant
    Filed: June 1, 2015
    Date of Patent: June 13, 2017
    Assignee: Apple Inc.
    Inventors: Kwang Soon Park, Chun-Yao Huang, Shih Chang Chang
  • Patent number: 9606382
    Abstract: A display has an array of pixels controlled by display driver circuitry. Gate driver circuitry supplies gate line signals to rows of the pixels. The pixels may be liquid crystal display pixels. Each pixel may have a common electrode voltage terminal. The display may have a transparent conductive film that forms a common electrode voltage layer that overlaps that array and that is shorted to the common electrode voltage terminals of the pixels. Metal common electrode voltage lines may run across the transparent conductive film to reduce resistance. Metal common electrode voltage paths that are coupled to the metal common electrode voltage lines may run along the left and right edge of the display. Common electrode voltage compensation circuits may receive feedback from the metal common electrode voltage paths. There may be two or more common electrode voltage compensation circuits for both the left and right edges of the display.
    Type: Grant
    Filed: May 14, 2015
    Date of Patent: March 28, 2017
    Assignee: Apple Inc.
    Inventors: Young-Jik Jo, Chun-Yao Huang, Hao-Lin Chiu, Kwang Soon Park, Shih Chang Chang
  • Publication number: 20170084247
    Abstract: A display device may include pixels and source lines that provide data line signals to the pixels. The display device may also include gate lines that provide gate signals to switches associated with the pixels. The display device may also include vertical gate lines disposed generally parallel to the source lines and coupled to the gate lines at cross point nodes. The display device may also include compensation lines, such that each compensation line is proximate to a respective vertical gate line. The compensation lines may transmit compensation signals having an opposite polarity as compared to respective gate signals to reduce or eliminate a kickback voltage on at least one of the plurality of pixels.
    Type: Application
    Filed: September 21, 2015
    Publication date: March 23, 2017
    Inventors: Byung Duk Yang, Chun-Yao Huang, Kyung Wook Kim, Patrick B. Bennett, Shih Chang Chang, Wonjae Choi, Hao-Lin Chiu, Kwang Soon Park, Xinyu Zhu
  • Patent number: 9595497
    Abstract: A display may have a thin-film transistor layer formed from a layer of thin-film, transistor circuitry on a substrate. The thin-film transistor layer may overlap a color filter layer. A portion of the thin-film transistor layer may extend past the color filter layer to for a ledge region. Components such as a flexible printed circuit and a display driver integrated circuit may be mounted to the thin-film transistor layer in the ledge region. The components may have alignment marks. The thin-film transistor layer may have a black masking layer that is patterned to form openings for display pixels. In a border area of the display that overlaps the ledge region, the thin-film transistor layer may have alignment mark viewing windows. Alignment marks formed from black masking material in the windows may be aligned with respective alignment marks on the components.
    Type: Grant
    Filed: September 23, 2014
    Date of Patent: March 14, 2017
    Assignee: Apple Inc.
    Inventors: Byung Duk Yang, Kwang Soon Park, Kyung-Wook Kim, Shih Chang Chang
  • Patent number: 9588371
    Abstract: A liquid crystal display may have a thin-film transistor layer with an array of pixel electrode structures for applying electric fields to a liquid crystal layer. The liquid crystal display may also have a color filter layer with an array of color filter elements. The color filter elements may allow the display to display color images. The color filter layer may be interposed between the thin-film transistor layer and a backlight. The liquid crystal layer may be sandwiched between the thin-film transistor layer and the color filter layer. The color filter layer may have a transparent substrate on which the color filter elements are formed. Black masking structures may be formed on a transparent overcoat layer that covers the color filter elements. Black column spacers may be formed from the same layer of material that forms the black masking structures.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: March 7, 2017
    Assignee: Apple Inc.
    Inventors: Byung Duk Yang, Flora M. Li, Kwang Soon Park, Ming-Chin Hung, Shih-Chang Chang, Yong Kwan Kim, Young Cheol Chang
  • Publication number: 20170026553
    Abstract: A display may include a color filter glass layer and a thin-film transistor glass layer that are attached with sealant. The thin-film transistor glass layer may have a recess in an inactive area of the display that accommodates a camera. The display layers may be provided with an opening that overlaps the recess. The recess may be a hole or a notch. The display may include circuitry and metal structures in the inactive area that are isolated from the recess with sealant. The sealant may have intersection points to isolate internal components from external contaminants and prevent reliability issues in the display. The display may be formed by cutting a motherglass layer into an individual display panel. The motherglass layer may include display layers attached with sealant. Cutting the mother glass layer may include cutting the sealant.
    Type: Application
    Filed: July 24, 2015
    Publication date: January 26, 2017
    Inventors: Szu-Hsien Lee, Jin Yan, Kwang Soon Park, Young Cheol Yang
  • Patent number: 9523896
    Abstract: A display may have a thin-film transistor (TFT) layer and color filter layer. Light blocking structures in an inactive area of the display may prevent stray backlight from leaking out of the display. The thin-film transistor layer may have a first substrate, a first black masking layer, a planarization layer, and a layer of TFT circuitry on the planarization layer. The color filter layer may have a second substrate and a second black masking layer on the second substrate. Light-cured sealant may be formed between the TFT layer and the color filter layer. Gaps may be formed in the second black masking layer to allow light to cure the sealant. At least a portion of the TFT circuitry may serve to block stray backlight penetrating through the gaps in the second black masking layer during normal operation of the display.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: December 20, 2016
    Assignee: Apple Inc.
    Inventors: Byung Duk Yang, Kwang Soon Park, Kyung-Wook Kim, Shih Chang Chang
  • Publication number: 20160351105
    Abstract: A display may have an array of pixels controlled by display driver circuitry. The display driver circuitry may supply the pixels with data signals over data lines in columns of the pixels and may supply the pixels with gate line signals over gate lines in rows of the pixels. The display driver circuitry may have a display driver integrated circuit located on one of the edges of the display. The display driver circuitry may also have gate driver integrated circuits that extend along opposing edges of the display to form a pair of shift registers. Conductive lines in a display substrate may be coupled to opposing ends of the shift registers and to intermediate locations within the shift registers to minimize delays in distributing a gate high voltage signal from the display driver integrated circuit to the shift registers.
    Type: Application
    Filed: June 1, 2015
    Publication date: December 1, 2016
    Inventors: Kwang Soon Park, Chun-Yao Huang, Shih Chang Chang