公开(公告)号：US20200045341A1

公开(公告)日：2020-02-06

申请号：US16050556

申请日：2018-07-31

Applicant: ATI Technologies ULC

Inventor： Anthony Wai Lap Koo ,  Syed Athar Hussain ,  Krunoslav Kovac

IPC: H04N19/85 ,  H04N19/124 ,  H04N19/182 ,  H04N19/433 ,  H04N19/98

Abstract: Systems, apparatuses, and methods for implementing an effective electro-optical transfer function for limited luminance range displays are disclosed. A processor detects a request to generate pixel data for display. The processor also receives an indication of an effective luminance range of a target display. The processor encodes pixel data of an image or video frame into a format which matches the effective luminance range of the target display. In one implementation, the processor receives encoded pixel data in a first format, wherein the first format has unused output pixel values which map to luminance values outside of the effective luminance range of the target display. The processor converts the encoded pixel data from the first format into encoded pixel data of a second format which matches the effective luminance range of the target display. A decoder then decodes the encoded pixel data and drives the decoded pixel data to the target display.

公开(公告)号：US11145240B2

公开(公告)日：2021-10-12

申请号：US16146731

申请日：2018-09-28

Applicant: ATI TECHNOLOGIES ULC

Inventor： Anthony W L Koo ,  Syed Athar Hussain ,  Krunoslav Kovac

IPC: G09G3/22 ,  G09G3/36

Abstract: A method for dynamic scaling of content luminance and backlight level includes determining, using one or more processors of a display system, an ambient light level of a local environment proximate the display system. Based on the ambient light level being brighter than a first ambient light threshold, it is determined that the display system is in a normal room or a bright environment. A minimum viewable threshold representing a minimum pixel luminance value perceivable by a user in the ambient light level of the local environment is determined. The method further includes generating a modified display image by shifting the pixel luminance values of one or more pixels of an input image such that a darkest pixel value of the modified display image is equal to or greater than the minimum viewable threshold before transmitting the modified display image for display.