US 2020/0029058 A1Published application

Light source response compensation for light projection system using a graphics processing unit

AssigneeSTMicroelectronics S.r.l.

InventorsMassimo RATTI, Eli YASER, Naomi PETRUSHEVSKY, Yotam NACHMIAS

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Abstract

A light projection system includes a GPU that receives video data containing video images, defines a two-dimensional grid (each element of which represents a position of a light beam at a different time), designates which elements of the two-dimensional grid correspond to positions of the light beam in a designated area, designates which elements correspond to positions of the light beam outside of the designated area with some positions outside being designated as calibration positions, maps each element corresponding to positions in the designated area to a corresponding pixel of a frame of a video image, and maps elements corresponding to calibration positions to calibration pixels. An ASIC receives the mapped pixels and mapped calibration pixels from the GPU, and generates a beam position control signal therefrom. A controller controls a movable mirror based on the beam position control signal.

Claims24

Dependent claims

A light projection system, comprising:

a light module configured to emit a light beam;
a movable mirror apparatus configured to reflect the light beam across a surface in a scan pattern;
a graphics processing unit (GPU) configured to:
receive video data containing video images for display;
estimate positions of the light beam on the surface as the movable mirror apparatus reflects the light beam across the surface in the scan pattern, with some of the positions being within a designated display area for the video images within the video data and with some of the positions being outside of the designated display area and designated as calibration positions;
and
process the video data based upon the estimated positions, the processing including adding calibration pixels to the video data for display in the calibration positions;
an application specific integrated circuit (ASIC) configured to receive the processed video data, and to generate a beam position control signal based thereupon;
a mirror controller configured to control the movable mirror apparatus as a function of the beam position control signal;
a light driver configured to control the light module as a function of the processed video data such that the video images are displayed within the designated display area and such that the calibration pixels are displayed in the calibration positions;
and
photodetection circuitry configured to detect display of the calibration pixels.

9 more elements

A light projection system, comprising:

a graphics processing unit (GPU) configured to:
receive video data containing video images for display;
define a two dimensional grid, with each element in the two dimensional grid representing a position of a light beam at a different time;
designate which elements of the two dimensional grid correspond to positions of the light beam in a designated display area;
designate which elements of the two dimensional grid correspond to positions of the light beam outside of the designated display area, with some positions of the light beam outside of the designated display area being designated as calibration positions;
map each element of the two dimensional grid corresponding to positions of the light beam in the designated display area to a corresponding pixel of a frame of a video image within received video data;
and
map elements of the two dimensional grid corresponding to calibration positions to calibration pixels;
an application specific integrated circuit (ASIC) configured to receive the mapped pixels of the video image and mapped calibration pixels from the GPU, and to generate a beam position control signal based thereupon;
and
a mirror controller configured to control a movable mirror apparatus to be used in the light projection system as a function of the beam position control signal.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/585,751Filed 27 Sep 2019
Priority: 21 Dec 2017
Published: 23 Jan 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H04N 9/3182
Video signal processing therefor: colour adjustment, e.g. white balance, shading or gamut
G02B 26/0833
By means of one or more reflecting elements: the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
G02B 26/0858
The reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD: the reflecting means being moved or deformed by piezoelectric means
G02B 26/101
Scanning systems: with both horizontal and vertical deflecting means, e.g. raster or XY scanners

Family

Application15/850,667Continuation in part · filed 21 Dec 2017
Application16/032,634Continuation · filed 11 Jul 2018
Application16/585,751Continuation
Application16/032,634Continuation in part
US 10,288,990 B1Related patent
US 10,469,813 B2Related patent
US 10,805,583 B2Related patent
US 2019/0199986 A1Published application
US 2020/0029058 A1This patent

From the US filing history. Foreign family members aren’t listed.