公开(公告)号：US12051353B2

公开(公告)日：2024-07-30

申请号：US17774386

申请日：2019-12-05

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Wonjae Choi ,  Sun-il Chang

IPC: G09G3/20

CPC classification number: G09G3/2003 ,  G09G2320/0242 ,  G09G2320/0686 ,  G09G2340/06

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for dual color management for a multi-pixel density display. In one aspect, the method includes obtaining an image to be shown on a display, where the display includes both a first area that has a first pixel density and a second area that has a second pixel density that is less than the first pixel density, determining that a pixel with an initial value in the image will be displayed in the first area of the display (120), in response to determining that a pixel with the initial value in the image will be displayed in the first area of the display, determining a remapped value for the pixel in the image based on the initial value and a lookup table for the first area (130), and providing the remapped value for output on the display (150).

公开(公告)号：US11929018B2

公开(公告)日：2024-03-12

申请号：US17291807

申请日：2020-05-19

Applicant: GOOGLE LLC

Inventor： Sang Young Youn ,  Sun-il Chang ,  Wonjae Choi ,  Hyunchul Kim

IPC: G09G3/3208 ,  G09G3/34

CPC classification number: G09G3/3208 ,  G09G3/3406 ,  G09G2310/08 ,  G09G2320/0247 ,  G09G2320/064 ,  G09G2320/10

Abstract: A frame generation subsystem renders a sequence of frames and a display control subsystem provides a brightness control signal configured to control a brightness of frames displayed at a display panel via pulse width modulation (PWM) of the brightness control signal and determines a deviation in a duty cycle of a first PWM period of the brightness control signal from a default duty cycle resulting from a delayed rendering of a frame. The display control subsystem adjusts a duty cycle of at least a second PWM period to compensate for the deviation in the duty cycle of the first PWM period. The resulting average duty cycle of the brightness control signal over the two frame periods is approximately equal to a default duty cycle and thereby mitigates viewable flicker resulting from the duty cycle change caused by the delayed rendering.

公开(公告)号：US11688367B2

公开(公告)日：2023-06-27

申请号：US17379371

申请日：2021-07-19

Applicant: Google LLC

Inventor： Wonjae Choi ,  Daniel Solomon ,  John Kaehler

IPC: G09G5/395 ,  G09G3/36 ,  G06T1/60 ,  G09G5/18

CPC classification number: G09G5/395 ,  G06T1/60 ,  G09G3/3611 ,  G09G5/18 ,  G09G2310/08 ,  G09G2360/18

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for enabling a variable refresh rate on a display. One of the methods includes receiving, from a content presentation device, a first signal set to a first value; completing generation of first visual content; and after completing the generation of the first visual content, determining that the first signal is set to the first value and a second threshold duration of time has not expired; sending, to the content presentation device, the first visual content, wherein sending the first visual content causes the content presentation device to change the first signal from the first value to the second value; and after sending the first visual content, receiving, from the content presentation device, the first signal set to the second value.

公开(公告)号：US20230196524A1

公开(公告)日：2023-06-22

申请号：US17051822

申请日：2019-12-04

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Wonjae Choi ,  Sang Young Youn ,  Sun-il Chang

IPC: G06T5/00

CPC classification number: G06T5/009 ,  G06T2207/20208

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for remapping for mixed dynamic range content. In one aspect, a method for remapping for mixed dynamic range content, the method includes obtaining an image to be displayed that includes both first dynamic range content and second dynamic range content, determining that the image includes first dynamic range content at a first pixel, determining a first remapped value for the first pixel based on a lookup table for first dynamic range content and an initial value for the first pixel, providing the first remapped value for the first pixel for display, determining that the image includes second dynamic range content at a second pixel, determining a second remapped value for the second pixel based on a second initial value for the second pixel, and providing the second remapped value for the second pixel for display.

公开(公告)号：US20220157234A1

公开(公告)日：2022-05-19

申请号：US17596047

申请日：2019-11-20

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Sun-il Chang ,  Wonjae Choi

IPC: G09G3/3208

Abstract: A burn-in compensation method and a computing device configured for burn-in compensation is disclosed. The burn-in compensation can minimize or eliminate a burn-in of an OLED display having areas with different pixel densities. Each area of the OLED display may be divided into zones that include one or more pixels and a burn-in factor may be computed for the zones. A limiting burn-in factor may be determined from a limiting zone that exhibits the highest burn-in. Other zones with burn-in factors that area significantly different from the limiting burn-in factor can be adjusted so that the pixels in the adjusted zones can be driven to radiate similar light at a power similar to the liming zone. The burn-in compensation may be performed for each area and a transition region may be created between areas to minimize light artifacts after burn-in compensation.

公开(公告)号：US20200187395A1

公开(公告)日：2020-06-11

申请号：US16788968

申请日：2020-02-12

Applicant: Google LLC

Inventor： Qi Qi ,  Wonjae Choi ,  Yi Tao

IPC: H05K9/00 ,  G06F1/16 ,  H04M1/02 ,  H05K1/02 ,  H05K5/00

Abstract: Methods, systems, and apparatus, for shielding a bending portion of a flexible display that can be incorporated in electronic devices. One of the apparatus includes a cover glass element; a driver integrated circuit (D-IC); a mandrel portion; a shaft portion; a panel, positioned between the cover glass element and the D-IC, and comprising an inner panel layer that wraps around at least a portion of the mandrel portion to form a bending portion of the panel, the panel attached on either side on the shaft portion; and a shielding layer positioned around the inner panel layer and configured to inhibit electromagnetic signals through the bending portion.

公开(公告)号：US20190174658A1

公开(公告)日：2019-06-06

申请号：US16201029

申请日：2018-11-27

Applicant: Google LLC

Inventor： Qi Qi ,  Wonjae Choi ,  Yi Tao

IPC: H05K9/00 ,  H05K5/00 ,  H05K1/02

CPC classification number: H05K9/0054 ,  G06F1/1652 ,  G06F1/1656 ,  G06F2203/04102 ,  G06F2203/04103 ,  G06F2203/04107 ,  H04M1/0268 ,  H05K1/0219 ,  H05K1/028 ,  H05K5/0017 ,  H05K2201/10128

Abstract: Methods, systems, and apparatus, for shielding a bending portion of a flexible display that can be incorporated in electronic devices. One of the apparatus includes a cover glass element; a driver integrated circuit (D-IC); a mandrel portion; a shaft portion; a panel, positioned between the cover glass element and the D-IC, and comprising an inner panel layer that wraps around at least a portion of the mandrel portion to form a bending portion of the panel, the panel attached on either side on the shaft portion; and a shielding layer positioned around the inner panel layer and configured to inhibit electromagnetic signals through the bending portion.

公开(公告)号：US12148367B2

公开(公告)日：2024-11-19

申请号：US17596047

申请日：2019-11-20

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Sun-il Chang ,  Wonjae Choi

IPC: G09G3/3208

Abstract: A burn-in compensation method and a computing device configured for burn-in compensation is disclosed. The burn-in compensation can minimize or eliminate a burn-in of an OLED display having areas with different pixel densities. Each area of the OLED display may be divided into zones that include one or more pixels and a burn-in factor may be computed for the zones. A limiting burn-in factor may be determined from a limiting zone that exhibits the highest burn-in. Other zones with burn-in factors that area significantly different from the limiting burn-in factor can be adjusted so that the pixels in the adjusted zones can be driven to radiate similar light at a power similar to the liming zone. The burn-in compensation may be performed for each area and a transition region may be created between areas to minimize light artifacts after burn-in compensation.

公开(公告)号：US20240265884A1

公开(公告)日：2024-08-08

申请号：US18621591

申请日：2024-03-29

Applicant: GOOGLE LLC

Inventor： Sang Young Youn ,  Sun-il Chang ,  Wonjae Choi ,  Sangmoo Choi

IPC: G09G3/34

CPC classification number: G09G3/3406 ,  G09G2320/0252 ,  G09G2320/064 ,  G09G2340/0435

Abstract: PWM-frame rate misalignment is mitigated through implementation of a discrete variable refresh rate (VRR) scheme. A target frame rate is limited to a frame rate selected from only those frame rates that facilitate alignment of each frame period to a specified edge of a PWM cycle of a brightness control signal of a display panel. This alignment results in each frame period at the selected frame rate starting at a same point in a corresponding PWM cycle and ending at a same point in a corresponding PWM cycle to help ensure a constant effective duty cycle across each successive frame period, which in turn mitigates perception of flicker that otherwise would arise. Further, the discrete VRR scheme can employ a compensation mode for compensating for the delay in rendering or otherwise obtaining a frame for display so as to maintain a consistent duty cycle in the brightness control signal.

公开(公告)号：US11783752B2

公开(公告)日：2023-10-10

申请号：US17615992

申请日：2019-12-17

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Sun-il Chang ,  Wonjae Choi ,  Sang Young Youn

IPC: G09G3/20 ,  G09G5/00

CPC classification number: G09G3/2074 ,  G09G5/005 ,  G09G2320/0276 ,  G09G2320/0285 ,  G09G2320/0673

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for gamma lookup table compression. In one aspect, a method includes obtaining a gamma value for a pixel of an image to be shown on a display, determining a base gamma value based on a base lookup table that corresponds to a base display condition, determining a delta gamma value based on a delta lookup table that corresponds to a current display condition for the pixel, determining a remapped gamma value for the pixel based on a combination of the base gamma value and the delta gamma value, and providing the remapped gamma value to be shown on the display.