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：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：US12223876B2

公开(公告)日：2025-02-11

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

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：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：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.

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.

公开(公告)号：US20220189415A1

公开(公告)日：2022-06-16

申请号：US17291987

申请日：2020-09-03

Applicant: Google LLC

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

IPC: 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：US11145256B1

公开(公告)日：2021-10-12

申请号：US17014585

申请日：2020-09-08

Applicant: Google LLC

Inventor： Sangmoo Choi ,  Sang Young Youn

IPC: G09G3/3266 ,  G09G3/3225

Abstract: This document describes systems and techniques for dynamic control of scan signals in active-matrix organic light-emitting diode (AMOLED) displays. Displays in portable electronic devices, such as smartphones, include tens of thousands of pixels. Scan signals in the display control the brightness and color of individual pixels. A leading source of power consumption in AMOLED displays, however, is the parasitic capacitance in the scan lines that carry the scan signals. As the frame rate of AMOLED displays has increased, the frequency of scan signals and the associated parasitic capacitance has also increased. The described AMOLED display can dynamically control the number of pulses in scan signals to reduce power consumption without degrading image quality.

公开(公告)号：US11037494B1

公开(公告)日：2021-06-15

申请号：US16824239

申请日：2020-03-19

Applicant: Google LLC

Inventor： Sun-il Chang ,  Sang Young Youn

IPC: G09G3/3233

Abstract: An example device includes a plurality of power converters configured to supply electrical power to a display, each optimized for a different output load current range; and a controller configured to: estimate a current level of the display; select, based on the estimated current level, a power converter of the plurality of power converters; and cause electrical power from the selected power converter to be supplied to the display.

公开(公告)号：US20210065635A1

公开(公告)日：2021-03-04

申请号：US16559491

申请日：2019-09-03

Applicant: Google LLC

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

IPC: 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.