公开(公告)号：US12008836B2

公开(公告)日：2024-06-11

申请号：US18313138

申请日：2023-05-05

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Chien-Hui Wen

IPC: G06V40/13 ,  G09G3/3208

CPC classification number: G06V40/1318 ,  G09G3/3208 ,  G09G2320/0633 ,  G09G2320/064

Abstract: This document describes systems and techniques for spatially and temporally dynamic illumination for fingerprint authentication. In aspects, a method is disclosed that involves receiving user input at a display of an electronic device, initiating biometric authentication, and instructing a display-driver integrated circuit (DDIC) to implement a local high-brightness mode, which causes a predetermined portion of the display to increase in luminance to a target luminance for at least a first interval and a second interval. The DDIC is also instructed to cause a variable portion of the display to increase in luminance for the first interval and, at the expiration of the first interval, decrease luminance. During the first and/or second interval, an under-display fingerprint sensor captures one or more images. It is then determined, based on analysis of the one or more images, whether the user input is indicative of an authorized user.

公开(公告)号：US20240177687A1

公开(公告)日：2024-05-30

申请号：US18435708

申请日：2024-02-07

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Chien-Hui Wen ,  Ken Kok Foo

IPC: G09G5/02

CPC classification number: G09G5/02 ,  G09G2320/0233

Abstract: Techniques and apparatuses are described that perform frequency compensation for a display. In aspects, a first uniformity of multiple regions of the display can be measured at a reference frequency. The display can then be driven at a second frequency and a second uniformity of the multiple regions of the display can be measured. The differences between the first and second uniformity can then be used to generate a compensation mask. XYZ domain data from the first and second uniformity measurements can be used to generate a color model characterization. The color model characterization can be used to convert the XYZ domain data into RGB data when the display is driven at the second frequency to compensate for the differences in uniformity across the multiple regions of the display.

公开(公告)号：US20230177728A1

公开(公告)日：2023-06-08

申请号：US17997109

申请日：2020-08-25

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Sang Young Youn

IPC: G06T7/90 ,  G06T1/20 ,  G06T1/60 ,  G06F3/14 ,  G09G3/3208

CPC classification number: G06T7/90 ,  G06F3/14 ,  G06T1/20 ,  G06T1/60 ,  G09G3/3208

Abstract: An example method includes obtaining a particular input color sample of a current line of samples rendered by a graphical processing unit (GPU) of the device; maintaining a cache that includes entries mapping input color samples to output interpolated color samples; determining whether the cache includes an entry corresponding to the particular input color sample; responsive to determining that the cache includes an entry corresponding to the particular input color sample, outputting, by the processing circuitry, a particular output interpolated color sample included in the entry corresponding to the particular input color sample without performing interpolation on the particular input color sample; and displaying, at a display of the device, a representation of the particular output interpolated color sample.

公开(公告)号：US11640811B2

公开(公告)日：2023-05-02

申请号：US17207443

申请日：2021-03-19

Applicant: Google LLC

Inventor： Hyunchul Kim ,  Sang Young Youn

IPC: G09G5/06 ,  G06T7/90 ,  G06T7/00

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for three sub-color correction based on two-dimensional graphs. In an aspect, a method includes obtaining an image to be shown on a display, determining three sub-color values of a particular pixel in the image, including a first sub-color value for a first sub-color, a second sub-color value for a second sub-color, and a third sub-color value for a third sub-color of the particular pixel, obtaining a representation of a two-dimensional graph of color-correction curves, selecting a selected color-correction curve to use to correct the first sub-color value based on both the second sub-color value and the third sub-color value, determining a corrected first sub-color value based on the first sub-color value, and outputting the image using the corrected first sub-color value instead of the first sub-color value.

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.