CN209962077U - Projection device and light source and equipment thereof - Google Patents
Projection device and light source and equipment thereof Download PDFInfo
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- CN209962077U CN209962077U CN201821945543.0U CN201821945543U CN209962077U CN 209962077 U CN209962077 U CN 209962077U CN 201821945543 U CN201821945543 U CN 201821945543U CN 209962077 U CN209962077 U CN 209962077U
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Abstract
The utility model discloses a projection device, including the light source, the light source includes a plurality of luminescence units that are used for launching the light beam, the correlation coefficient of the dot matrix set that a plurality of luminescence units formed is greater than or equal to 0.3, at least some the correlation coefficient of the dot matrix subset that the luminescence unit formed is less than 0.2; and the optical assembly is used for copying the light beam emitted by the light-emitting element into a plurality of light beams. The utility model also discloses a light source and equipment. The utility model discloses projection arrangement and light source and equipment thereof have better user experience.
Description
Technical Field
The utility model relates to an optics field especially relates to a projection arrangement and light source and equipment thereof.
Background
With the technical progress and the improvement of living standard of people, electronic devices including mobile phones, tablet computers and the like have more new functions, such as: the facial recognition unlocks, thereby obtaining a better user experience. In order to implement the above functions, the device needs to be able to acquire two-dimensional or three-dimensional information of the object to implement object feature recognition.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a can be used to object feature identification's projection arrangement and light source and equipment thereof.
One aspect of the present invention provides a projection apparatus, including a light source, the light source including a plurality of light emitting units for emitting light beams, a correlation coefficient of a dot matrix set formed by the plurality of light emitting units being greater than or equal to 0.3, and a correlation coefficient of a dot matrix subset formed by at least a part of the light emitting units being less than 0.2; and the optical assembly is used for copying the light beam emitted by the light-emitting element into a plurality of light beams.
Optionally, the light emitting device further comprises a semiconductor substrate, and the plurality of light emitting units share one semiconductor substrate or are distributed on a plurality of semiconductor substrates.
Optionally, the number of the light-emitting units corresponding to the dot matrix subset is not less than 10% of the total number of the light-emitting units, or the number of the light-emitting units corresponding to the dot matrix subset is not less than 9; and the total number of the light-emitting units corresponding to the dot matrix set is not less than 50.
Optionally, the correlation of the lattice set or the lattice subset is calculated in a two-dimensional plane coordinate system, and the coordinate system is a polar coordinate system or a rectangular coordinate system.
Optionally, the projection apparatus further includes a driving circuit, and the driving circuit provides a working current required by the light emitting unit.
Optionally, the light emitting element includes one or more of a VCSEL, or an LED, or an LD.
Optionally, the optical component comprises a diffractive optical element and/or a lens.
Optionally, a correlation coefficient between a subset of lattices existing in the lattice set and the lattice set is greater than or equal to 0.3, and a correlation coefficient between a subset of lattices not existing in the lattice set is 1.
An aspect of the present invention also provides a light source, including a plurality of light emitting units arranged on the semiconductor substrate for emitting light beams, wherein a correlation coefficient of a lattice set formed by the plurality of light emitting units is greater than or equal to 0.3, and at least a part of the correlation coefficient of a lattice subset formed by the light emitting units is less than 0.2.
An aspect of the present invention also provides an apparatus, comprising a projection device and a receiving device, wherein the projection device projects a light beam having a speckle pattern onto an external object, at least a part of the light beam reflected by the external object is received by the receiving device, the projection device comprises a plurality of light emitting units, two-dimensional patterns corresponding to the plurality of light emitting units have a correlation, and the two-dimensional patterns can be divided into a plurality of sub two-dimensional patterns having a correlation, the sub two-dimensional patterns correspond to at least 9 light emitting units, at least one of the sub two-dimensional patterns does not have a correlation, the projection device can project a light beam having a plurality of speckle patterns corresponding to the two-dimensional patterns of the light emitting units onto the external object, and at least a part of the light beam reflected by the external object is received by the receiving device.
Compared with the prior art, the utility model discloses projection arrangement and light source and equipment thereof can be used for object feature recognition, have better user experience.
Drawings
Fig. 1 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
fig. 2 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
fig. 3 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
fig. 4 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
fig. 5 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
fig. 6 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
FIG. 7 is a schematic illustration of a correlation coefficient;
FIG. 8 is a schematic illustration of a correlation coefficient;
fig. 9 is a schematic diagram of an embodiment of a projection apparatus of the present invention;
FIG. 10 is a schematic diagram of a speckle pattern projected by the projection apparatus of FIG. 9;
figure 11 is a schematic diagram of one embodiment of the apparatus of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, in one aspect of the present invention, a projection apparatus 10 includes a light source 20 and an optical assembly 30. The light source 20 emits a light beam to the optical assembly 30, which is optimized by the optical assembly 30 to illuminate an external object, such as a human face. In this embodiment, the light beam may be infrared light. In other embodiments of the present invention, the light beam emitted from the light source 20 may be one or more of visible light, ultraviolet light, electromagnetic wave, sound wave, and ultrasonic wave.
There is also generally at least one receiving means cooperating with said projecting means 10 for receiving said light beam at least partly reflected by the external object, thereby obtaining depth information of the external object.
The light source 20 includes a plurality of light emitting units 21, and an arrangement distribution of the plurality of light emitting units 21 may also be referred to as an array of the light emitting units 21. The light Emitting unit 21 may include one or more of an led (light Emitting diode), a VCSEL (vertical cavity Surface Emitting Laser), or an ld (Laser diode).
In some embodiments of the present invention, the projection apparatus 10 further includes a substrate (substrate)22, and the plurality of light emitting units 21 are disposed on the substrate 22. The light emitting units 21 are distributed on the substrate 22 in a two-dimensional pattern with a certain correlation. The optical assembly 30 is disposed on the pad layer of the substrate 22, and the optical assembly 30 is disposed opposite to the plurality of light emitting units 21 of the light source 20. In this embodiment, the substrate 22 is a semiconductor substrate. In other embodiments of the present invention, the substrate 22 can also be a glass substrate, a metal substrate, etc., and the substrate 22 can also be referred to as a substrate, a base, etc. In other or modified embodiments of the present invention, the plurality of light emitting units 21 share one substrate, or are distributed on different substrates. In other or modified embodiments of the present invention, the projection apparatus 10 further includes a driving circuit, and the driving circuit is used for providing the light emitting unit 21 with a working current.
In the present embodiment, the optical assembly 30 includes a Diffractive Optical Element (DOE). In other embodiments of the present invention, the optical assembly 30 may further include a lens or a lens group disposed between the diffractive optical element and the light source 20. The optical assembly 30 may be used to split the light beam emitted by the light-emitting unit 21, i.e. to replicate and expand the incident light beam into a plurality of light beams. The light beam emitted from the light emitting unit 21 is replicated into a plurality of light beams after passing through the optical assembly 30. Regarding each light emitting unit 21 as a point light source whose emitted light beam is replicated into a plurality of light spots by the optical assembly 30, the optical assembly 30 can replicate the two-dimensional pattern of the plurality of light emitting units 21 into a plurality of corresponding patterns consisting of the light spots. Referring to fig. 2, in a modified embodiment of the present invention, the optical assembly 30 includes a diffractive optical element 31 and a lens 32. The lens 32 may be a convex lens or a concave lens and may be used to converge or diverge the light beam. The diffractive optical element 31 is used to reproduce and project a plurality of light beams emitted from the light source 30.
The two-dimensional pattern formed by the distribution of the light emitting units 21 is referred to as a dot matrix set, wherein the two-dimensional pattern corresponding to a part of the light emitting units 21 is referred to as a dot matrix subset, and the two-dimensional patterns corresponding to the light emitting units 21 other than the dot matrix subset are "complementary set of the dot matrix subset" or "complementary set". The set of lattices typically comprises two or more subsets of lattices. A light spot formed on a certain plane in space by the light beam emitted from the light emitting unit 21 is referred to as a "light spot", and a plurality of the light spots have a two-dimensional pattern substantially identical to a two-dimensional pattern formed by the distribution of the plurality of light emitting units 21 corresponding thereto.
In the embodiment of the present invention, the correlation of the lattice set is higher, for example, the correlation coefficient of the lattice set is greater than or equal to 0.3. The set of lattices may be divided into a plurality of subsets of lattices, at least one of which has a low correlation, e.g. at least one of which has a correlation coefficient of less than 0.2. It should be noted that the division described above with respect to the dot matrix subsets need not be unique, and the dot matrix set may have a plurality of divisions, so that different dot matrix subsets can be obtained. In other embodiments of the present invention, the correlation coefficient of the lattice set is greater than or equal to 0.3 and less than 1.
In other embodiments of the present invention, the number of the light-emitting units 21 included in the dot matrix subset having the at least one correlation coefficient smaller than 0.2 is not less than 10% of the number of all the light-emitting units 21.
In other embodiments of the present invention, the number of the light emitting units 21 included in the dot matrix subset having the at least one correlation coefficient smaller than 0.2 is not smaller than 9.
For convenience of description and clarity of understanding, a two-dimensional pattern (i.e., a set or subset of lattices) formed by the plurality of light-emitting units 21 may be located in an area of W columns by H rows (W, H is a positive integer) by establishing a two-dimensional planar coordinate system, for example, an X-Y orthogonal coordinate system.
In this embodiment, the area is a rectangular array, each rectangle is called a block, and each block corresponds to two values, i.e., 0 or 1, wherein the block having the light emitting unit 21 corresponds to a value of 1, and the block not having the light emitting unit 21 corresponds to a value of 0. The block values of the ith row and the jth line are R (i, j) (1 is less than or equal to i, j is less than or equal to n).
The correlation calculation is performed on the region, and a correlation coefficient f of the two-dimensional pattern corresponding to the light emitting unit 21 located in the rectangular array R can be obtained.
In this embodiment, the correlation coefficient f of one lattice set or lattice subset can be calculated by using the following formula:
P＝{R0，R1，…，RN}
R′n＝T(Rn)
in the formula, H, W, N, n is a positive integer, i is more than or equal to 0 and less than or equal to W, and j is more than or equal to 0 and less than or equal to H.
Wherein:
a: the ratio of the number of valid points;
p: region Rn(N is more than or equal to 0 and less than or equal to N);
s: a full area comprising a two-dimensional pattern;
l. |: an operator for counting the number of effective points (non-repeated) in the region set;
R0: a sub-region satisfying a predetermined condition;
Rn: r is to be0The corresponding sub-region is traversed in the whole region S to obtain the sum R0Coefficient of correlation fnA sub-region greater than or equal to a predetermined threshold thr is Rn(0<N ≦ N, N being a positive integer), for example: when thr is 0.3, fn≥0.3；
N：fnThe number of sub-regions > thr (e.g., 0.3);
R′n：Rnthe result after T transformation;
fn：Rnand R0A correlation coefficient between;
t: translation, rotation, mirror image and other transformation operators;
h: subregion R0Or Rn(N is more than 0 and less than or equal to N, and N is a positive integer);
w: subregion R0Or RnN is more than 0 and less than or equal to N, and N is a positive integer;
the T-transform may include, but is not limited to, one or more of shift, rotation, mirror symmetry in a two-dimensional plane. In this embodiment, the sub-region RnNot subject to conversion, i.e. R'n＝Rn. In this embodiment, R is as defined abovenTraversal in the definition, as used herein, is understood to mean R0The corresponding sub-region is moved in an arbitrary direction in the entire region by a distance not smaller than the size of the light emitting unit 21 itself. In addition, because of overlap between sub-regions or the existence of overlap, the number of valid points and their proportion need to be counted. In the above formula, R0For sub-regions satisfying a predetermined condition, R0Traversing the whole area S corresponding to the whole light-emitting unit 21 and calculating the sub-area R and the whole area S except R0Other than the correlation coefficient, assuming that there are N and R0Sub-regions between which the correlation coefficient is greater than or equal to a preset correlation coefficient threshold, denoted R respectively1，…，RNThen the whole region S and the sub-region R0All the sub-region sets P ═ { R } between which the correlation coefficient is greater than or equal to the preset correlation coefficient threshold0，R1，…，RNWith correlation between sub-regions in the set P. In this embodiment, the threshold of the correlation coefficient of the preset condition is 0.3. In other embodiments of the present invention, the preset condition may have other settings.
It should be noted that the present invention is not limited thereto, and the above parameters, formulas and definitions are all exemplary illustrations, and some or all of the parameters, formulas or definitions, or some or all combinations of the parameters, formulas or definitions are selected as the correlation coefficient calculation methods, and all of the methods belong to the scope of the present invention. Those skilled in the art can change, modify, replace and deform the above embodiments within the scope of the present invention, and all belong to the protection scope of the present invention.
In this example, R0The predetermined condition satisfied may be, for example and without limitation, region R0The number of the light emitting cells 21 corresponding thereto is not less than 10% of the number of all the light emitting cells 21. In other embodiments of the present invention, R0The predetermined condition to be satisfied may also be that the number of the corresponding light emitting units 21 in its area is not less than 9. In other embodiments of the present invention, R0The predetermined conditions to be satisfied may also have different settings, for example, the number of the corresponding light emitting units 21 may have different values, or the ratio of the number of the light emitting units 21 to the total number of the light emitting units 21 may be different.
Furthermore, in some embodiments of the present invention, when the region S corresponds to the lattice set, the sub-region Rn satisfies the condition that the number of the internal corresponding light emitting elements is not less than 9; when the region S corresponds to the lattice subset, the sub-region Rn satisfies a condition that the number of the internally corresponding light emitting elements is not less than 3.
In this embodiment, Rn is fnNot less than 0.3, the utility model discloses in other or modified embodiments, Rn can also have different settings, for example correspond f not less than 0.5's subregion.
In this embodiment, when f is greater than or equal to 0 and less than 0.3, the correlation of the corresponding region and/or sub-region (lattice set or lattice subset) is low or no. When f is more than or equal to 0.3, the corresponding area and/or the subarea have obvious correlation. The above parameters S, R0Rn, etc. are relative to the object it calculates. For example, for a dot matrix set, the full area S is the area where the two-dimensional pattern formed by all the light emitting units 21 is located; for the dot matrix subset, the full area S is the area where the two-dimensional pattern corresponding to the light emitting unit 21 in the dot matrix subset is located.
Referring to fig. 3, in an embodiment of the present invention, the dot matrix set is located in the area S with 8 columns and x10 rows, the matrix with 8 columns and x5 rows in the upper portion is selected as the sub-area R0, the matrix with 8 columns and x5 rows in the lower portion is selected as the sub-area R1, and the number of the corresponding light emitting units 21 in the sub-areas R0 and R1 is 13. At this time, according to the above formula, a is 1, R1 ═ R1, H is 5, W is 8, and the correlation coefficient f ═ f1 ≈ 0.7 of the lattice set, so that the correlation coefficient of the lattice set is greater than 0.3, it can be said that the lattice set corresponding to the region S has correlation, while the pattern internal correlation coefficient corresponding to the sub-regions R0 and R1 is less than 0.2, and the lattice subsets corresponding to R0 and R1 have no correlation.
It should be noted that the present invention is not limited thereto, and in other or modified embodiments of the present invention, the calculation method illustrated above is not necessarily adopted, or the calculation method does not necessarily adopt a rectangular array as a forming manner of the block, for example, the block may be a triangle, a circle, a polygon or an irregular figure. The above equations may also be simplified or complicated. The different rectangular arrays in the above description may include two different two-dimensional patterns, or may represent part or all of one two-dimensional pattern. It should be understood by those skilled in the art that the above embodiments of the present invention are only exemplary, and all the technical solutions that the two-dimensional pattern formed by the light emitting unit 21 has correlation belong to the scope covered by the present invention, which is disclosed in the present specification and protected by the present invention.
In other or modified embodiments of the present invention, other formulas or algorithms may also be used for the correlation calculation, or other coordinate systems may be set up, such as: a polar coordinate system. In general, a matrix, a regular polygon mesh, or a pattern thereof after two-dimensional spatial translation is highly correlated. Further, it can be understood that a set of two-dimensional patterns obtained by performing a plurality of times of copying of two-dimensional patterns has a high correlation.
In another embodiment of the present invention, the correlation of the dot matrix set or the dot matrix subset can be evaluated by the following method:
defining a dot matrix set or a corresponding area of a dot matrix subset needing to calculate the correlation as S;
defining an arbitrarily selected sub-region satisfying a predetermined condition as R0; wherein, the sub-region R0 satisfying the predetermined condition is, for example but not limited to: the proportion of the number of the light-emitting cells 21 contained in the sub-region R0 to the total number of the light-emitting cells 21 in the region S is not less than 10%, or the number of the light-emitting cells 21 contained in the sub-region R0 is not less than 9.
If there are no sub-regions in any direction that are the same or substantially the same as the pattern of R0, then the pattern of region S has no correlation;
the pattern of the region S has a correlation if at least a subregion identical or substantially identical to the pattern of R0 is present in any direction.
In another embodiment of the present invention, the correlation of the dot matrix set or the dot matrix subset can be evaluated by the following method:
defining a dot matrix set or a corresponding area of a dot matrix subset needing to calculate the correlation as S;
defining a sub-region satisfying a predetermined condition as R0; wherein, the sub-region R0 satisfying the predetermined condition is, for example but not limited to: the number of the light emitting cells 21 contained in the sub-region R0 is not less than 10% of the total number of the light emitting cells 21 in the region S, or the number of the light emitting cells 21 contained in the sub-region R0 is not less than 9.
Rotating the sub-region R0 for a certain angle to obtain a sub-region R1; wherein, R1 can be obtained by rotating R0 in the plane of the corresponding two-dimensional pattern.
If there are no sub-regions in any direction that are identical or substantially identical to the pattern of R0 or R1, then the pattern of region S has no correlation;
the pattern of the region S has a correlation if there are at least sub-regions in any direction that are identical or substantially identical to the pattern of R0 or R1.
The pattern being identical or substantially identical may be understood as the position of the light emitting unit 21 is seen as one point in the pattern, with 30% or more of the points in the pattern of the 2 sub-areas coinciding. In other embodiments of the present invention, considering that the light emitting unit 21 itself has a certain size, when comparing the patterns of 2 sub-regions, the other points in the circle having a certain point as the center and a predetermined length as the radius are considered to coincide with the point.
In another embodiment of the present invention, the correlation of the dot matrix set or the dot matrix subset can be evaluated by the following method:
defining a dot matrix set or a corresponding area of a dot matrix subset needing to calculate the correlation as S;
defining a sub-region satisfying a predetermined condition as R0; wherein, the sub-region R0 satisfying the predetermined condition is, for example but not limited to: the number of the light emitting cells 21 contained in the sub-region R0 is not less than 10% of the number of the light emitting cells 21 in the region S, or the number of the light emitting cells 21 contained in the sub-region R0 is not less than 9.
Mirror-symmetrical the sub-region R0 to obtain a sub-region R1;
if there are no sub-regions in any direction that are identical or substantially identical to the pattern of R0 or R1, then the pattern of region S has no correlation;
the pattern of the region S has a correlation if there are at least sub-regions in any direction that are identical or substantially identical to the pattern of R0 or R1.
In another embodiment of the present invention, the dot matrix set corresponding to the two-dimensional pattern formed by the light emitting unit 21 can be divided into a plurality of dot matrix subsets, wherein at least one dot matrix subset is transformed by one or more of translation, symmetry and rotation and the correlation coefficient of the dot matrix set is greater than or equal to 0.3, and the correlation of at least one dot matrix subset is less than 0.2.
In another embodiment of the present invention, the dot matrix set corresponding to the two-dimensional pattern formed by the light emitting unit 21 can be divided into a plurality of dot matrix subsets, wherein the correlation coefficient of at least one dot matrix subset and the dot matrix subsets obtained by transforming other subsets by one or more of translation, symmetry and rotation is greater than or equal to 0.3, and the correlation of at least one dot matrix subset is less than 0.2.
In another embodiment of the present invention, the correlation between two subsets of the lattice can be evaluated by the following method:
defining the corresponding areas of the two dot matrix subsets needing to calculate the mutual correlation as R1 and R2, wherein the range of the sub-area R1 is less than or equal to that of the sub-area R2; in the embodiment, the range of the sub-region may be understood as the smallest rectangular area capable of completely accommodating the sub-region in the rectangular coordinate system, and in other embodiments of the present invention, the range of the sub-region may also have different definitions and understandings as required, and all of them fall within the scope of the present invention.
Traversing the R1 in any direction in the range of R2, if the R2 does not have a sub-region (partial region in the sub-region is called sub-region) which is the same as or basically the same as the pattern of the R1 in any direction, the patterns of the sub-regions R1 and R2 have no correlation;
the patterns of the sub-regions R1, R2 have a correlation if at least a sub-region identical or substantially identical to the pattern of R1 is present in any direction of R2.
In other or modified embodiments of the present invention, the evaluation of the correlation between the lattice subsets includes performing correlation coefficient calculation on the lattice subsets after one or more of translation, symmetry, and rotation is performed on the lattice subsets, or performing correlation coefficient calculation on the lattice subsets obtained after one or more of translation, symmetry, and rotation is performed on the lattice subsets and other lattice subsets.
Typically, but not necessarily, the dot matrix subsets and the corresponding areas of the light emitting units 21 satisfy the condition of open and connected in two-dimensional space, and are convex areas. In certain embodiments, the regions are also sometimes referred to as closed regions. If each point in the lattice subset has at least one neighborhood which is all contained in the point, the lattice subset is called an open set. A subset of lattices is said to be connected if any two points in the subset of lattices can be connected by a polyline which completely belongs to the subset of lattices.
It should be noted that other words may appear in the present invention or other technical material to describe the above-mentioned situation, such as but not limited to: speckles, or patterns, or two-dimensional patterns, or sub-two-dimensional patterns, or structured light patterns, etc., will be understood by those skilled in the art to be equivalent to the dot matrix sets or subsets of the present invention.
For convenience of description and understanding, when referring to the correlation of a certain two-dimensional pattern, if the correlation is obvious, for example, the correlation coefficient is greater than or equal to 0.3, the present specification or claims sometimes refer to it as having correlation; the present specification or claims sometimes also refer to no correlation if it is low, e.g. the correlation coefficient is less than 0.2. It should be understood that the description or claims of the present invention does not necessarily represent that the correlation coefficient of the two-dimensional pattern or the dot matrix subset is 0 when the description or claims do not refer to the correlation.
In fig. 3 to 8 of the drawings of the present disclosure, the small circle represents the position of the light emitting unit 21, and the peripheral square frame represents the semiconductor substrate, so as to facilitate description and understanding, some dotted lines or separation lines appear in the drawings, and these lines are only used for illustrating the embodiments of the present disclosure, and do not necessarily exist in practice.
Referring to fig. 4, in an embodiment of the present invention, the dot matrix set of the two-dimensional pattern formed by the light emitting units 21 can be divided into 6 dot matrix subsets (rectangles shown by dotted lines) with the same or substantially the same pattern, the correlation coefficient of the dot matrix set is greater than or equal to 0.3, and the correlation coefficient of the 6 dot matrix subsets itself is less than 0.2.
Referring to fig. 5, in an embodiment of the present invention, the dot matrix set of the two-dimensional pattern formed by the plurality of light emitting units 21 can be divided into 4 dot matrix subsets (e.g. 2 × 2 squares divided by dotted lines), wherein 3 dot matrix subsets have substantially the same two-dimensional pattern, and another dot matrix subset has different two-dimensional patterns. The lattice set has correlation, and the correlation coefficient is greater than 0.3 and less than 1; 3 of the lattice subsets have no correlation and the correlation coefficient is less than 0.2.
Referring to fig. 6, in an embodiment of the present invention, the dot matrix set of the two-dimensional pattern formed by the plurality of light emitting units 21 can be divided into 4 dot matrix subsets (e.g. 2 × 2 squares divided by dotted lines), wherein 3 dot matrix subsets have substantially the same two-dimensional pattern, and another dot matrix subset has different two-dimensional patterns. The set of lattice has a correlation and 1 of the subset of lattice has no correlation.
Referring to fig. 7, in an embodiment of the present invention, the dot matrix set corresponding to the plurality of light emitting units 21 has related sub-regions R0 and R1, the patterns of the sub-regions R0 and R1 are substantially the same, but the number of the light emitting units 21 in the dot matrix set is 113, the number of the light emitting units 21 corresponding to the sub-regions R0 and R1 is 24, the effective point ratio is 24/116 ═ 0.21 (rounding, the same below), and the correlation coefficient f ═ af1 < 0.3, so that the correlation coefficient of the dot matrix set is less than 0.3.
It will be appreciated that enlarging the size of the sub-region R0 may increase the effective point ratio a, but correspondingly also decrease the correlation coefficient f1 of R0 and R1, so that the correlation coefficient f of the final lattice set is still less than 0.3. Referring to fig. 8, the sub-regions R0 and R1 have more light-emitting units 21 than those in fig. 7, and the effective dot ratio is 40/116 equal to 0.34, however, the correlation coefficient f1 of the sub-regions R0 and R1 is smaller, resulting in the correlation coefficient f of the entire lattice set being less than 0.3.
Referring to fig. 9, in an embodiment of the present invention, the dot matrix set of the two-dimensional pattern formed by the plurality of light emitting units 21 can be divided into 2 dot matrix subsets (e.g. 2 × 1 squares divided by dotted lines) having substantially the same two-dimensional pattern, the correlation of the dot matrix set is greater than 0.3, and the correlation of the dot matrix subset is less than 0.2. Wherein each dot matrix subset corresponds to a two-dimensional pattern without correlation formed by 60 light-emitting units 21.
Referring to fig. 10, a speckle pattern is formed by the light beams emitted by the array of light-emitting units 21 shown in fig. 9 after being copied and projected by the optical assembly 30, wherein each small circle represents a light spot. In the embodiment, the optical assembly 30 comprises a diffractive optical element that replicates the array of light-emitting cells 21 in a 3 × 3 matrix, each small matrix box corresponding to the two-dimensional pattern formed by the plurality of light-emitting cells 21.
After the speckle patterns are irradiated on an external object and received by the receiving device, the image processor can obtain depth information of the external object by calculating the corresponding local displacement of the light beam of each speckle and obtaining the corresponding depth coordinate of the speckle by triangulation.
In the above and other variations of the present invention, the lattice subsets may or may not be arranged in a matrix or grid, and may be randomly or pseudo-randomly distributed, for example. The shape of the subset of the lattice may be rectangular, circular or other eligible shape.
In this embodiment, the plurality of light emitting units 21 are integrated on a semiconductor substrate. The light source includes a VCSEL array chip, which may be a die or a packaged chip. The VCSEL array chip size may be 3mm by 3mm or 5mm by 5mm, which may include several tens to several hundreds of light emitting cells 12. The above data are merely illustrative, and not restrictive, and the light emitting units 21 may be integrated on a glass substrate, a metal substrate, etc., the VCSEL array may be manufactured in different sizes according to the requirement, and the number of the light emitting units 21 may also be different. Those skilled in the art can understand that the technical solutions described above can be replaced, changed, etc. without creative efforts, and all belong to the protection scope of the present invention.
The utility model discloses a still disclose a light source, it includes a plurality of luminous element (shown by the small circle in fig. 8) of setting on the base plate, luminous element can be light-emitting component, for example LED, VCSEL or LD. The light emitting units form a set of lattices with a correlation, the set of lattices having at least one subset of lattices without a correlation.
The utility model discloses still disclose an equipment, including above in an embodiment of equipment the utility model discloses projection arrangement 10 or light source, equipment for example but not limited to cell-phone, panel computer, notebook computer, supervisory equipment, mobile unit, intelligent household equipment etc. have the equipment of 3D object recognition function.
Referring to fig. 11, in an embodiment of the present invention, the apparatus 100 includes a projection device 101, a receiving device 102, and a main body 103 for accommodating the projection device 101 and the receiving device 102. The projection means 101 projects the light beam with the speckle pattern onto an external object, at least part of the light beam reflected by the external object being received by the receiving means 102. The projection apparatus 101 and the projection apparatus 10 have substantially the same structure. The projection device 101 comprises a plurality of light-emitting units, the two-dimensional patterns corresponding to the plurality of light-emitting units have correlation, the two-dimensional patterns can be divided into a plurality of sub two-dimensional patterns with correlation, the sub two-dimensional patterns correspond to not less than 9 light-emitting units, and at least one sub two-dimensional pattern has no correlation. The projection device 101 is capable of projecting a light beam having a plurality of spot patterns corresponding to the two-dimensional pattern of the light emitting unit onto an external object.
The body 103 further comprises a processor which may obtain two-dimensional information and/or depth information of the object from the light beam received by the receiving means 102. For example, the processor can obtain depth information for the object by calculating the corresponding local displacement of the beam for each spot and triangulating to the corresponding depth coordinate at that spot.
The light beam may be infrared light, ultraviolet light or visible light. In this embodiment, taking infrared light as an example, the receiving device 102 includes an infrared sensor, and the projecting device 101 includes a plurality of VCSELs. The main body further includes a processor that can acquire depth information of the object from the received infrared light. In some embodiments, the main body 103 further includes a display screen and a camera, the display screen can be used for displaying pictures, and the camera can be used for taking pictures or taking pictures.
In this embodiment, the apparatus 100 acquires depth information of an object by using structured light, and performs three-dimensional feature recognition or three-dimensional image rendering on the object. In other embodiments of the present invention, the apparatus 100 includes two or more receiving devices 102, and according to the light beams received by the two or more receiving devices 102, the apparatus 100 can draw a three-dimensional image of an object and obtain depth information of the object according to the binocular imaging principle.
In other embodiments of the present invention, the projection device 10 and the apparatus 100 may also be used for two-dimensional image rendering or two-dimensional object feature recognition.
Compared with the prior art, the utility model discloses projection arrangement and equipment can acquire object degree of depth information, draws object three-dimensional image, have better user experience.
The description of the present invention provides many different embodiments or examples for implementing the invention. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which are repeated for purposes of simplicity and clarity and do not by themselves dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The description of the invention in the specification and claims with respect to "a plurality" includes 2 and more than 2 cases. It should also be noted that, unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," and the like are to be construed broadly and can, for example, be fixedly disposed, detachably disposed, or integrally disposed. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A projection device, comprising:
a light source including a plurality of light emitting units for emitting light beams, a correlation coefficient of a lattice set formed by the plurality of light emitting units being greater than or equal to 0.3, and a correlation coefficient of at least a part of lattice subsets formed by the plurality of light emitting units being less than 0.2;
and the optical assembly is used for duplicating the light beam emitted by the light-emitting unit into a plurality of light beams.
2. The projection device of claim 1, further comprising a semiconductor substrate, wherein the plurality of light-emitting units share a single semiconductor substrate or are distributed across a plurality of semiconductor substrates.
3. The projection apparatus according to claim 1, wherein the number of the light-emitting units corresponding to the subset of the dot matrix is not less than 10% of the total number of the light-emitting units, or the number of the light-emitting units corresponding to the subset of the dot matrix is not less than 9; and the total number of the light-emitting units corresponding to the dot matrix set is not less than 50.
4. The projection apparatus of claim 1, wherein the correlation of the set or subset of lattices is calculated in a two-dimensional planar coordinate system, the coordinate system being a polar coordinate system or a rectangular coordinate system.
5. The projection device of claim 1, further comprising a driving circuit, wherein the driving circuit provides a required operating current for the light emitting unit.
6. The projection apparatus according to claim 1, wherein the light emitting unit comprises one or more of a VCSEL, or an LED, or an LD.
7. The projection device of claim 1, wherein the optical component comprises a diffractive optical element and/or a lens.
8. The projection apparatus of claim 1, wherein a correlation coefficient between a subset of lattices in the set of lattices and the set of lattices is greater than or equal to 0.3, and a correlation coefficient between a subset of lattices in the set of lattices and an absence of a subset of lattices in the set of lattices is 1.
9. A light source is characterized by comprising a plurality of light emitting units which are arranged on a semiconductor substrate and used for emitting light beams, wherein the correlation coefficient of a lattice set formed by the plurality of light emitting units is greater than or equal to 0.3, and the correlation coefficient of at least part of lattice subsets formed by the plurality of light emitting units is less than 0.2.
10. An apparatus comprising a projection device and a receiving device, wherein the projection device projects a light beam having a speckle pattern onto an external object, at least a part of the light beam reflected by the external object is received by the receiving device, the projection device includes a plurality of light emitting units, the two-dimensional patterns corresponding to the plurality of light emitting units have correlation, and the two-dimensional patterns are divided into a plurality of sub two-dimensional patterns having correlation, the sub two-dimensional patterns correspond to not less than 9 light emitting units, at least one of the sub two-dimensional patterns has no correlation, the projection device is capable of projecting a light beam having a plurality of speckle patterns corresponding to the two-dimensional patterns of the light emitting units onto the external object, and at least a part of the light beam reflected by the external object is received by the receiving device.
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