公开(公告)号：US20220366846A1

公开(公告)日：2022-11-17

申请号：US16967222

申请日：2020-01-24

Applicant: Google LLC

Inventor： Sun-il Chang ,  Hyunchul Kim

IPC: G09G3/3233

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for compensating an image to be shown on a display including an array of light-emitting pixels and a sensor arranged to receive light transmitted by adjacent light-emitting pixels. A method includes collecting, from the sensor, a luminance of light received by the sensor during an emission-on period, and a luminance of light received by the sensor during an emission-off period. The method includes calculating, by comparing the luminance during the emission-on period to the luminance during the emission-off period, a luminance of light internally reflected from the adjacent pixels and received by the sensor during the emission-on period. The method includes determining that an error between the luminance of light internally reflected and a reference luminance equals or exceeds a threshold error, and adjusting a driving voltage for driving the pixels to reduce the error.

公开(公告)号：US20220301516A1

公开(公告)日：2022-09-22

申请号：US17635980

申请日：2020-01-21

Applicant: Google LLC

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

IPC: G09G5/00 ,  G09G5/10

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for gamma lookup table compression based on dimensionality reduction. In one aspect, a method includes obtaining a selection of a particular display condition for a display panel from among different display conditions for the display panel, selecting, based on the selection of the particular display condition, a set of weights for a set of basis functions from among different sets of weights that correspond to the different display conditions for the display panel, determining a gamma lookup table for the particular display condition for the display panel based on the set of weights that were selected and the set of basis functions, and remapping an image to be output on the display panel based on the gamma lookup table for the particular display condition.

公开(公告)号：US20220108653A1

公开(公告)日：2022-04-07

申请号：US17311651

申请日：2019-08-01

Applicant: GOOGLE LLC

Inventor： Hyunchul Kim ,  Sun-il Chang

IPC: G09G3/3208 ,  G09G5/02

Abstract: A method includes receiving original image content represented in a first color model, determining converted image content represented in a second color model from the original image content represented in the first color model, obtaining a distortion compensation profile that compensates for differences in response characteristics between the first portion of the display and the second portion of the display, determining compensated image content represented in the second color model based on the converted image content and the distortion compensation profile, determining reconverted compensated image content represented in the first color model from the compensated image content represented in the second color model, and providing the reconverted compensated image content represented in the first color model for display on a display panel.

公开(公告)号：US10984731B2

公开(公告)日：2021-04-20

申请号：US16559491

申请日：2019-09-03

Applicant: Google LLC

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

IPC: G09G3/32 ,  G09G3/3291 ,  G09G3/20

Abstract: An apparatus is described that includes a display panel and a sensor. The display panel includes an array of pixels configured to direct light through a front side of the display panel. Each pixel includes sub-pixels, each of which includes an organic light emitting diode (OLED) and an integrated circuit (IC) for controlling an electrical current to the OLED. The sensor is arranged at a back side of the display panel. The sensor includes an emitter configured to emit electromagnetic radiation transmitted through a first area of the display panel. The IC of sub-pixels of the array of pixels outside the first area includes a first IC arrangement. The IC of sub-pixels of the array of pixels within the first area includes a transistor in addition to the first IC arrangement. The transistor is configured to operate as a control switch controlling emission of light from the sub-pixel.

公开(公告)号：US20210074207A1

公开(公告)日：2021-03-11

申请号：US16563739

申请日：2019-09-06

Applicant: Google LLC

Inventor： Sangmoo Choi ,  Sun-il Chang ,  Ion Bita

IPC: G09G3/3225 ,  H04M1/02

Abstract: An apparatus is described that includes an organic light emitting diode (OLED) display and a sensor. The OLED display includes a first area having a first pixel density, a second area having a second pixel density, and a third area having a third pixel density. The second area is arranged between the first area and the third area. The first pixel density is lower than the second pixel density. The second pixel density is lower than the third pixel density. The sensor is arranged to receive electromagnetic radiation transmitted through the first area of the OLED display.

公开(公告)号：US20250140155A1

公开(公告)日：2025-05-01

申请号：US19010896

申请日：2025-01-06

Applicant: Google LLC

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

IPC: G09G3/20 ,  G09G3/3233

Abstract: Rendering images on an active area of an OLED includes rendering images on the active area of the display panel with a plurality of different frame rates. For a plurality of the different frame rates having a frame rate that matches or is above a threshold frame rate, an image refresh operation is performed once per frame period and a self-refresh operation is not performed during the frame period. When rendering images on the active area, for at least one of the different frame rates having a frame rate that is lower than the threshold frame rate, an image refresh operation is performed once per frame period and a self-refresh operation is performed at least once during the frame period.

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：US12039133B2

公开(公告)日：2024-07-16

申请号：US17999019

申请日：2020-06-03

Applicant: Google LLC

Inventor： Young Seok Oh ,  Sun-il Chang

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G06F3/044 ,  G06F2203/04104

Abstract: A computing device can receive a first measured touch value, the first measured touch value indicating first touch input at a first location near a camera included in the computing device, receive a second measured touch value, the second measured touch value indicating second touch input at a second location farther from the camera than the first location, a density of touch sensors in the second location being greater than a density of touch sensors in the first location, generate a first compensated touch value based on the first measured touch value and a first scaling value, generate a second compensated touch value based on the second measured touch value and a second scaling value, the second scaling value being less than the first scaling value, and process the first touch input and the second touch input based on the first compensated touch value and the second compensated touch value.

公开(公告)号：US20240078952A1

公开(公告)日：2024-03-07

申请号：US18261245

申请日：2021-02-12

Applicant: Google LLC

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

IPC: G09G3/20 ,  G09G3/3233

CPC classification number: G09G3/2007 ,  G09G3/3233 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2310/08 ,  G09G2320/0247 ,  G09G2320/0673 ,  G09G2330/021 ,  G09G2340/0435 ,  G09G2360/16

Abstract: Rendering images on an active area of an OLED includes rendering images on the active area of the display panel with a plurality of different frame rates. For a plurality of the different frame rates having a frame rate that matches or is above a threshold frame rate, an image refresh operation is performed once per frame period and a self-refresh operation is not performed during the frame period. When rendering images on the active area, for at least one of the different frame rates having a frame rate that is lower than the threshold frame rate, an image refresh operation is performed once per frame period and a self-refresh operation is performed at least once during the frame period.