Laser projection apparatus and laser projection display method

Patent metadata

Field	Value
Publication number	US-2024380869-A1
Application number	US-202418662804-A
Country	US
Kind code	A1
Filing date	May 13, 2024
Priority date	Nov 29, 2018
Publication date	Nov 14, 2024
Grant date	—

Abstract

A laser projection apparatus and a laser projection display method are provided. The laser projection apparatus includes a laser source, an optical engine, a projection lens, and a power system architecture. The power system architecture includes a digital light processing (DLP) control processing portion. The DLP control processing portion is configured to: output a first enable signal and a first luminance adjustment signal to a laser driver circuit and a first drive signal to a digital micro-mirror device, in the first period; output a second enable signal and a second luminance adjustment signal to the laser driver circuit and a second drive signal to the digital micro-mirror device, in the second period. The laser driver circuit is configured to: drive a laser array to emit a primary color beam in the first period, and drive the laser array to be turned off in the second period.

First claim

What is claimed is:

1 . A laser projection apparatus, comprising:
a laser source configured to provide illumination beams; the laser source being a tri-color laser source, and including:
a plurality of laser arrays configured to emit beams of a plurality of primary colors, the illumination beams including the beams of the plurality of primary colors; wherein a display cycle of a frame image includes output periods of the beams of the plurality of primary colors, each of the output periods of the beams of the plurality of primary colors includes at least one first period, the output period of the beam of at least one of the plurality of primary colors further includes a second period;
an optical engine including a digital micro-mirror device, the digital micro-mirror device including a plurality of micro-mirrors, and the plurality of micro-mirrors being configured to flip at different angles due to control of a first drive signal obtained from conversion of an image display signal, so that the illumination beams provided by the laser source are modulated into projection beams; a projection lens configured to project the projection beams on a medium for imaging; and a power system architecture configured to control the laser source and the optical engine to operate, the power system architecture including:
a laser driver circuit configured to drive the laser source to be lit or turned off; and
a digital light processing (DLP) control processing portion connected to the laser driver circuit and the digital micro-mirror device, the DLP control processing portion being configured to:
generate a first enable signal and a first luminance adjustment signal according to the image display signal of an image to be displayed, and output the first enable signal and the first luminance adjustment signal to the laser driver circuit, in the first period; and generate the first drive signal according to the image display signal, and output the first drive signal to the digital micro-mirror device, in the first period; and
generate a second enable signal and a second luminance adjustment signal, and output the second enable signal and the second luminance adjustment signal to the laser driver circuit, in the second period; and generate a second drive signal, and output the second drive signal to the digital micro-mirror device, in the second period; the second drive signal being at least partially different from the first drive signal, and the second luminance adjustment signal being zero value;

wherein the laser driver circuit is further configured to:
receive and perform processing on the first enable signal and the first luminance adjustment signal, and output the processed signals to the corresponding laser array, so as to drive the laser array to emit the beam of the corresponding primary color, in the first period; and
receive and perform processing on the second enable signal and the second luminance adjustment signal, and output the processed signals to the corresponding laser array, so as to drive the laser array to be turned off, in the second period.

2 . The laser projection apparatus according to claim 1 , wherein the at least one first period included by the output period of the beam of the at least one primary color includes at least two first periods, and the second period is between the at least two first periods.

3 . The laser projection apparatus according to claim 1 , wherein the second period satisfies one of following:
a start moment of the second period includes a start moment of the output period of the beam of the at least one primary color; and an end moment of the second period includes an end moment of the output period of the beam of the at least one primary color.

4 . The laser projection apparatus according to claim 1 , wherein the beam of the at least one primary color includes at least one of a blue beam, a red beam, or a green beam.

5 . The laser projection apparatus according to claim 1 , wherein a duration of the second period is 1% to 4.5% of the display cycle of the frame image, inclusive.

6 . The laser projection apparatus according to claim 1 , wherein the DLP control processing portion is further configured to:
obtain timings for the laser source to output the illumination beams; the timings indicating the output periods for the laser source to output the beams of the plurality of primary colors; and configure the second period according to the output periods for the laser source to output the beams of the plurality of primary colors; the second period being less than the output period of the beam of the primary color in which the second period is located.

7 . The laser projection apparatus according to claim 1 , wherein the DLP control processing portion is further configured to:
output the same first drive signal to the digital micro-mirror device at a start moment of the second period and an end moment of the second period.

8 . The laser projection apparatus according to claim 1 , wherein the DLP control processing portion is further configured to:
obtain gray scale information of each pixel in a plurality of consecutive frame images to be displayed; and drive a micro-mirror corresponding to a pixel to preform rotation switching, if a continuous holding time of the micro-mirror corresponding to the pixel in an ON state or an OFF state is greater than a set safe holding time.

9 . A laser projection apparatus, comprising:
a laser source configured to provide illumination beams; the laser source including:
a laser array configured to emit a laser beam of one color; and
a color wheel including a plurality of regions outputting beams of different primary colors, the color wheel being configured to rotate, and sequentially output beams of a plurality of primary colors due to irradiation of the laser beam, the illumination beams including the beams of the plurality of primary colors; wherein a display cycle of a frame image includes output periods of the beams of the plurality of primary colors, each of the output periods of the beams of the plurality of primary colors includes at least one first period, the output period of the beam of at least one of the plurality of primary colors further includes a second period, the second period is in a spoke region period; display cycles of a plurality of frame images include the spoke region period, the spoke region period is portions of continuous output periods of beams of two primary colors, and the spoke region period is a continuous period, the spoke region period corresponds to a bordering region of two adjacent regions of the color wheel;
an optical engine including a digital micro-mirror device, the digital micro-mirror device including a plurality of micro-mirrors, and the plurality of micro-mirrors being configured to flip at different angles due to control of a first drive signal obtained from conversion of an image display signal, so that the illumination beams provided by the laser source are modulated into projection beams; a projection lens configured to project the projection beams on a medium for imaging; and a power system architecture configured to control the laser source and the optical engine to operate, the power system architecture including:
a laser driver circuit configured to drive the laser source to be lit or turned off; and
a DLP control processing portion connected to the laser driver circuit and the digital micro-mirror device, the DLP control processing portion being configured to:
generate a first enable signal and a first luminance adjustment signal according to the image display signal of an image to be displayed, and output the first enable signal and the first luminance adjustment signal to the

Assignees

• Hisense Laser Display Co Ltd

Inventors

• Xiao Jichen
• Zhao Yishi

Classifications

• H04N9/3161 Primary

  using laser light sources (using laser beams scanning the display screen H04N9/3129) · CPC title

• H04N9/3114

  by using a sequential colour filter producing one colour at a time · CPC title

• G03B21/2033

  LED or laser light sources · CPC title

• G03B21/008

  using micromirror devices · CPC title

• G03B21/206

  Control of light source other than position or intensity · CPC title