Abstract: A display panel, a driving method therefor, and a display device. The display panel includes a scan drive module and multiple rows of sub-pixel units arranged in sequence. The multiple rows of sub-pixel units are divided into n sub-pixel unit groups, and two adjacent rows of the sub-pixel units in each sub-pixel unit group are spaced by (n?1) rows of the sub-pixel units in other sub-pixel unit groups. The scan drive module is configured to sequentially scan and drive each row of the sub-pixel units in each sub-pixel unit group and scan and drive the n sub-pixel unit groups in divided periods within a scan cycle.

Abstract: Provided is a carbon dioxide fluidity control device comprising, a sample preparation tank, a high-pressure stirring unit, a reciprocating plunger pump and a booster pump, wherein the stirring unit comprises one or more high-pressure stirring tanks, each provided with an atomizing spray probe and a piston, wherein a discharge port of the sample preparation tank is connected to the atomizing spray probe via a plunger pump, which is connected to the piston to push the piston to reciprocate; the booster pump is connected to the high-pressure stirring tanks to provide supercritical carbon dioxide to the high-pressure stirring tank; and a discharge port of the high-pressure stirring tanks is connected to an oilfield well group. Provided is a carbon dioxide fluidity control method using the device, comprising mixing surfactants and nanoparticles with heated carbon dioxide, and injecting a microemulsion of supercritical carbon dioxide and nano-silicon dioxide into an oilfield well group.

Abstract: The present disclosure relates to a method and system for detecting a structural defect in additive manufacturing. The method includes: layering a three-dimensional model of an additive manufacturing test piece to obtain a two-dimensional contour of an interface of each layer, and generating a machining path; arranging a non-contact sensor at a fixed measuring point of the additive manufacturing test piece, and acquiring an ultrasonic signal at each machining point when a pulse laser conducts machining point by point along the machining path; forming a visual ultrasonic field based on all the ultrasonic signals, and determining ultrasonic field data; determining, based on the ultrasonic field data, a curve of a peak of an incident wave changing with the machining path; and determining whether a machining defect exists at the machining points based on the curve of the peak of the incident wave changing with the machining path.

Abstract: A structured light projection module, a depth camera, and a method for manufacturing the structured light projection module are provided. The module comprises: a light source, comprising a plurality of sub-light sources that are arranged in a two-dimensional array and configured to emit two-dimensional patterned beams corresponding to the two-dimensional array, and the two-dimensional patterned beams comprising two-dimensional patterns; a lens, receiving and converging the two-dimensional patterned beams; and a diffractive optical element, receiving the two-dimensional patterned beams converged and emitted from the lens, and projecting speckle patterned beams corresponding to speckle patterns. The speckle patterns comprise a plurality of image patterns corresponding to the two-dimensional patterns, and the image patterns are rotated by an angle such that edges of the image patterns are not in parallel with a baseline between the structured light projection module and a capture module.

Abstract: A method for correcting interference fringes includes: obtaining correction parameter sets of different photographing distances; obtaining a to-be-corrected image and calculating an average depth value of the to-be-corrected image; selecting a target correction parameter set corresponding to the average depth value from the correction parameter sets of different photographing distances; and correcting first pixel values of to-be-corrected pixels at the different coordinate positions in the to-be-corrected image according to different target correction parameters corresponding to the different coordinate positions in the target correction parameter set, to obtain a corrected image. Each of the correction parameter sets includes different correction parameters corresponding to different coordinate positions. The average depth value includes an average value of depth values corresponding to a plurality of to-be-corrected pixels in the to-be-corrected image.

Abstract: A method for correcting interference fringes includes: obtaining interference fringe images with different photographing distances; obtaining a to-be-corrected image including to-be-corrected pixels, and calculating a depth value of each to-be-corrected pixel in the to-be-corrected image; selecting, from the interference fringe images with different photographing distances, an interference fringe image corresponding to the depth value of each to-be-corrected pixel as a target interference fringe image; extracting first pixel values of target coordinate positions in the target interference fringe image; and correcting second pixel values of to-be-corrected pixels according to the first pixel values corresponding to the to-be-corrected pixels to obtain a corrected image.

Abstract: A method for search of light spot positions, includes the following steps: calibrating spatial template distribution of light spots in an object space of a distance measurement system and spatial emission angle factors of the light spots; calculating coordinates of offset light spots on a pixel unit of a collector after impact deformation occurs in the distance measurement system, and obtaining serial numbers of the offset light spots; and according to the coordinates of the offset light spots on the pixel unit of the collector and the serial numbers, calibrating the distance measurement system after the impact deformation occurs to obtain new spatial emission angle factors, and completing the search of light spot positions.

Abstract: A TOF depth measuring device includes: an emission module projects a dot matrix pattern onto a target object, and an acquisition module includes an image sensor configured to receive reflected optical signals reflected by the target object. First pixels in the pixel array detect reflected optical signals of real light spots reflected by the target object, and second pixels in the pixel array detect reflected optical signals of real light spots reflected more than once. The TOF depth measuring device further includes a processor, connected to the emission module and the acquisition module, filters the first reflected optical signal to obtain a third reflected optical signal, and calculate a phase difference based on the third reflected optical signal to obtain a first depth map of the target object.

Abstract: A time of flight (TOF)-based depth measuring device is provided, which includes: a light emitter, configured to emit a beam to a target object; a light sensor, configured to capture a reflected beam reflected by the target object, generate a corresponding electrical signal, and obtain a two-dimensional image of the target object; and a processor, connected to the light emitter and the light sensor, and configured to: control the light emitter to emit a modulated beam, turn on the imaging module to receive the electrical signal and the two-dimensional image, perform calculation on the electrical signal to obtain one or more TOF depth values of the target object, perform deep learning by using the two-dimensional image to obtain a relative depth value, and determine an actual depth value from the one or more TOF depth values based on the relative depth value.

Abstract: A structured light projection module, a depth camera, and a method for manufacturing the structured light projection module are provided. The module comprises: a light source, comprising a plurality of sub-light sources that are arranged in a two-dimensional array and configured to emit two-dimensional patterned beams corresponding to the two-dimensional array, and the two-dimensional patterned beams comprising two-dimensional patterns; a lens, receiving and converging the two-dimensional patterned beams; and a diffractive optical element, receiving the two-dimensional patterned beams converged and emitted from the lens, and projecting speckle patterned beams corresponding to speckle patterns. The speckle patterns comprise a plurality of image patterns corresponding to the two-dimensional patterns, and the image patterns are rotated by an angle such that edges of the image patterns are not in parallel with a baseline between the structured light projection module and a capture module.

Abstract: A diffractive optical element is configured to receive a first patterned light beams, and diffracts the first patterned light beams to project a second patterned light beam outwardly. The second patterned light beam is formed of combined arrangement of a plurality of first patterned light beams, and the combined arrangement includes periodic arrangement in a first direction and a second direction. The first direction and the second direction are not perpendicular to each other. By designing the performance of the diffractive optical element, the outwardly projected structured light pattern is periodically arranged in two directions, and the two directions are not perpendicular to each other, such that spot patterns are highly unrelated in multiple directions, improving accuracy.

Abstract: A structured light projection module, a depth camera, and a method for manufacturing the structured light projection module are provided. The module comprises: a light source, comprising a plurality of sub-light sources that are arranged in a two-dimensional array and configured to emit two-dimensional patterned beams corresponding to the two-dimensional array, and the two-dimensional patterned beams comprising two-dimensional patterns; a lens, receiving and converging the two-dimensional patterned beams; and a diffractive optical element, receiving the two-dimensional patterned beams converged and emitted from the lens, and projecting speckle patterned beams corresponding to speckle patterns. The speckle patterns comprise a plurality of image patterns corresponding to the two-dimensional patterns. Relationships between adjacent image patterns of the plurality of image patterns comprise at least two of an overlapping relationship, an adjoining relationship, and a spacing relationship.

Abstract: The present disclosure discloses a VCSEL array light source, a pattern design method for the VCSEL array light source, a laser projection apparatus, and a three-dimensional (3D) imaging device. The VCSEL array light source includes a semiconductor substrate and a plurality of VCSEL light sources arranged on the semiconductor substrate in a two-dimensional array. The two-dimensional array includes at least one sub-array and is generated by transforming the at least one sub-array.

Abstract: A structured light projection module, a depth camera, and a method for manufacturing the structured light projection module are provided. The module comprises: a light source, comprising a plurality of sub-light sources that are arranged in a two-dimensional array and configured to emit two-dimensional patterned beams corresponding to the two-dimensional array, and the two-dimensional patterned beams comprising two-dimensional patterns; a lens, receiving and converging the two-dimensional patterned beams; and a diffractive optical element, receiving the two-dimensional patterned beams converged and emitted from the lens, and projecting speckle patterned beams corresponding to speckle patterns. The speckle patterns comprise a plurality of image patterns corresponding to the two-dimensional patterns. Relationships between adjacent image patterns of the plurality of image patterns comprise at least two of an overlapping relationship, an adjoining relationship, and a spacing relationship.

Abstract: A diffractive optical element is configured to receive a first patterned light beams, and diffracts the first patterned light beams to project a second patterned light beam outwardly. The second patterned light beam is formed of combined arrangement of a plurality of first patterned light beams, and the combined arrangement includes periodic arrangement in a first direction and a second direction. The first direction and the second direction are not perpendicular to each other. By designing the performance of the diffractive optical element, the outwardly projected structured light pattern is periodically arranged in two directions, and the two directions are not perpendicular to each other, such that spot patterns are highly unrelated in multiple directions, improving accuracy.

Abstract: The present disclosure discloses a VCSEL array light source, a pattern design method for the VCSEL array light source, a laser projection apparatus, and a three-dimensional (3D) imaging device. The VCSEL array light source includes a semiconductor substrate and a plurality of VCSEL light sources arranged on the semiconductor substrate in a two-dimensional array. The two-dimensional array includes at least one sub-array and is generated by transforming the at least one sub-array.