CN117029674A

CN117029674A - Grating alignment detection method, device and grating alignment system

Info

Publication number: CN117029674A
Application number: CN202310877307.9A
Authority: CN
Inventors: 叶铭鹏; 王云帆; 管晋
Original assignee: Zhejiang Chiyun Technology Co ltd
Current assignee: Zhejiang Chiyun Technology Co ltd
Priority date: 2023-07-17
Filing date: 2023-07-17
Publication date: 2023-11-10

Abstract

The application relates to the technical field of head-up display, and provides a grating alignment detection method, a device and a grating alignment system, wherein the method is characterized in that a matching result of a first alignment mark on a grating and a second alignment mark on a display screen is determined; under the condition that the matching result indicates that the first alignment mark and the second alignment mark are successfully matched, a moire image corresponding to the display screen is obtained; determining the gap distance corresponding to at least two mole patterns in the mole pattern image and the shape of the mole patterns in the mole pattern image, wherein the gap distance corresponding to the mole patterns comprises the distances between the mole patterns and all adjacent mole patterns; therefore, the accurate detection of the alignment condition can be realized by judging the gap distance, the preset distance and the shape of the moire pattern, the automatic alignment and detection of the grating and the display screen are realized, and the alignment device has the characteristic of high alignment efficiency.

Description

Grating alignment detection method, device and grating alignment system

Technical Field

The present application relates to the field of head-up display technologies, and in particular, to a method and an apparatus for detecting alignment of a grating, and a system for aligning the grating.

Background

The 3D Head Up Display (HUD for short) can provide three-dimensional visual perception for users without any aid of vision-aiding devices (such as 3D glasses and helmets, etc.), so that the three-dimensional Head Up Display has a good application prospect.

In general, a 3D HUD is configured to split light by a lenticular or slit grating attached to a surface of a display screen, so that a user's left and right eyes can see images having parallax, and the images are fused into images having a stereoscopic effect in the brain. Therefore, the alignment accuracy between the lenticular or slit grating and the display screen will directly affect the display effect of the 3D HUD.

At present, only the alignment condition of the grating and the display screen is directly observed by naked eyes, so that the alignment error of the grating and the display screen is large, the alignment precision is not high, and the display effect of the 3D HUD is poor.

Disclosure of Invention

In order to solve the problems in the prior art, the embodiment of the application provides a grating alignment detection method, a grating alignment detection device and a grating alignment system. The technical scheme is as follows:

in one aspect, a method for detecting alignment of a grating is provided, the method comprising:

determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen;

Under the condition that the matching result indicates that the first alignment mark and the second alignment mark are successfully matched, a moire image corresponding to the display screen is obtained;

determining the gap distance corresponding to at least two mole lines in the mole line image and the shape of the mole lines in the mole line image; the gap distance corresponding to the mole pattern comprises the distance between the mole pattern and all adjacent mole patterns;

if the difference value between the gap distances corresponding to the at least two mole patterns is smaller than or equal to the preset distance, generating a first alignment result, wherein the mole patterns in the mole pattern image are in straight lines and parallel to the side edge of the display area of the display screen; the first alignment result represents that the alignment of the grating and the display screen is qualified; otherwise, generating a second alignment result; and the second alignment result represents that the alignment of the grating and the display screen is unqualified.

In one possible embodiment, the display screen includes a display area and a bezel area; two ends of a diagonal line of the frame area are respectively provided with a first mark; the display area is provided with a pixel array; taking edge pixel points of the pixel array corresponding to two ends of the diagonal line of the display area as second marks; the grating comprises a grating-free region and a grating region corresponding to the display region in position; the grating-free area is provided with a third mark corresponding to the first mark position; the two ends of the diagonal line of the grating area are respectively provided with a fourth mark; determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen comprises:

Determining the coincidence ratio of the two first marks with the third marks corresponding to the positions respectively;

determining the distance between the fourth mark and the second mark corresponding to the position under the condition that the coincidence ratio of the two second alignment marks and the third mark corresponding to the position is larger than or equal to a first preset threshold value;

and determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen based on the distance between the fourth mark and the second mark corresponding to the position and a second preset threshold value.

In a possible embodiment, determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen based on the distance between the fourth mark and the second mark corresponding to the position and the second preset threshold value includes:

comparing the distance between the fourth mark and the second mark corresponding to the position with a second preset threshold value to obtain a comparison result;

generating a first matching result under the condition that the comparison result indicates that the distance exceeds a second preset threshold value; the first matching result represents that the first alignment mark and the second alignment mark are successfully matched;

generating a second matching result under the condition that the comparison result indicates that the distance does not exceed a second preset threshold value; the second matching result represents that the first alignment mark and the second alignment mark fail to be matched.

In one possible embodiment, the first identifier comprises a cross identifier and a fork identifier;

the third identifier is the same as the first identifier corresponding to the position;

the fourth mark comprises a first mark strip and a second mark strip which are intersected at a point; the edges of the first mark strip and the second mark in the length direction can be attached; the second mark strip can be attached to the edge of the second mark in the width direction.

In a possible embodiment, after determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen, the method further includes:

and generating a second alignment result under the condition that the matching result indicates that the first alignment mark and the second alignment mark fail to be matched.

In a possible embodiment, obtaining the moire image corresponding to the display screen includes:

and acquiring a Moire image corresponding to the display screen by using the image acquisition equipment.

In another aspect, a grating alignment detection device is provided, which includes:

the result determining module is used for determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen;

the image acquisition module is used for acquiring a moire image corresponding to the display screen under the condition that the matching result indicates that the first alignment mark and the second alignment mark are successfully matched;

The gap distance determining module is used for determining the gap distance corresponding to at least two mole patterns in the mole pattern image and the shape of the mole patterns in the mole pattern image; the gap distance corresponding to the mole pattern comprises the distance between the mole pattern and all adjacent mole patterns;

the result generation module is used for generating a first alignment result if the difference value between the gap distances corresponding to at least two mole patterns is smaller than or equal to a preset distance, and the shape of the mole patterns in the mole pattern image is a straight line and is parallel to the side edge of the display area of the display screen; the first alignment result represents that the alignment of the grating and the display screen is qualified; otherwise, generating a second alignment result; and the second alignment result represents that the alignment of the grating and the display screen is unqualified.

On the other hand, a grating alignment system is provided, which comprises image acquisition equipment, an alignment laminating device and a processor; the processor is provided with the grating alignment detection device;

the image acquisition equipment is electrically connected with the processor, and is used for acquiring images containing the first alignment mark, the second alignment mark and the mole patterns in the alignment process and sending the images to the processor;

the alignment and lamination device comprises a base and an adsorption device which are oppositely arranged; a display screen is arranged on the base; the adsorption device is connected with the base through a position adjusting device; the adsorption device is used for adsorbing the grating.

On the other hand, a grating alignment and lamination method is provided, which is applied to the grating alignment system, and the method comprises the following steps:

acquiring the position information of the grating and the position information of the display screen;

generating a descending adjustment signal based on the first alignment result, the position information of the grating and the position information of the display screen;

the telescopic height of the position adjusting device is controlled based on the descending adjusting signal so as to enable the adsorption device connected with the position adjusting device to descend to a preset position, and further enable the grating to be attached to the display screen.

On the other hand, a grating alignment detection device is provided, disposed on a processor of the grating alignment system, and the device includes:

the position information acquisition module is used for acquiring the position information of the grating and the position information of the display screen;

the signal generation module is used for generating a descending adjustment signal based on the first alignment result, the position information of the grating and the position information of the display screen;

and the control module is used for controlling the telescopic height of the position adjusting device based on the descending adjusting signal so as to realize that the adsorption device connected with the position adjusting device descends to a preset position and further realize the lamination of the grating and the display screen.

The embodiment of the application determines the matching result of the first alignment mark on the grating and the second alignment mark on the display screen; under the condition that the matching result indicates that the first alignment mark and the second alignment mark are successfully matched, a moire image corresponding to the display screen is obtained; determining the gap distance corresponding to at least two mole patterns in the mole pattern image and the shape of the mole patterns in the mole pattern image, wherein the gap distance corresponding to the mole patterns comprises the distances between the mole patterns and all adjacent mole patterns; and then the gap distance, the preset distance and the shape of the moire patterns can be judged to accurately detect the alignment condition, and the automatic alignment and detection of the grating and the display screen are realized, so that the alignment device has the advantage of high alignment efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a grating alignment system according to an embodiment of the present application;

fig. 2 is a right side view of an alignment bonding device according to an embodiment of the present application;

FIG. 3 is a schematic flow chart of a grating alignment detection method according to an embodiment of the present application;

FIG. 4 is a top view of a display screen according to an embodiment of the present application;

FIG. 5 is a top view of a grating according to an embodiment of the present application;

FIG. 6 is a side view of a cylinder provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a positional relationship between a fourth mark and a second mark when alignment of a grating and a display screen is completed according to an embodiment of the present application;

FIG. 8 is a top view of a grating and a display screen when alignment is completed according to an embodiment of the present application;

FIG. 9 is a schematic representation of a moire image provided by an embodiment of the present application;

FIG. 10 is a schematic representation of another moire image provided by an embodiment of the present application;

FIG. 11 is a block diagram illustrating a grating alignment detection apparatus according to an embodiment of the present application;

FIG. 12 is a schematic flow chart of a method for aligning and attaching gratings according to an embodiment of the present application;

fig. 13 is a block diagram of a grating alignment and lamination device according to an embodiment of the present application.

The following is a description of the drawings:

1-an image acquisition device; 2-aligning and attaching device; 21-position adjustment means; 211-left and right adjusting knobs; 212-front-rear adjustment knob; 213-height adjustment knob; 214-a height adjustment mechanism; 22-adsorption device; 221-mounting structure; 222-mounting through holes; 223-viewing area; 224-suction cup; 23-a support structure; 24-base; 25-a rotation mechanism; a 3-processor; 4-a backlight module; 5-a display screen; 51-border area; 52-a display area; 53-first identification; 54-second identification; 55-pixel points; 6-grating; 61-no grating region; 62-grating area; 63-a third identifier; 64-fourth identification; 641-a first identification strip; 642-a second identification strip; 65-cylinder; 7-an adhesive layer.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values for the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range description features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to include any and all subranges subsumed therein. For example, a specified range from "1 to 10" should be considered to include any and all subranges between the minimum value of 1 and the maximum value of 10. Exemplary subranges from 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, and the like.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Referring to fig. 1-2, fig. 1 is a schematic structural diagram of a grating alignment system according to an embodiment of the present application; fig. 2 is a right side view of an alignment bonding device according to an embodiment of the present application. The grating alignment system comprises image acquisition equipment 1, an alignment laminating device 2 and a processor 3; the processor 3 is provided with a grating alignment detection device, the image acquisition equipment 1 is electrically connected with the processor 3, and the image acquisition equipment 1 is used for acquiring images containing a first alignment mark, a second alignment mark and mole patterns in the alignment process and sending the images to the processor 3; the first alignment mark is positioned on the grating, the second alignment mark is positioned on the display screen, and whether the grating and the display screen are aligned accurately can be judged by judging whether the first alignment mark and the second alignment mark are matched or not; the alignment and lamination device 2 comprises a base 24 and an adsorption device 22 which are oppositely arranged; the base 24 is provided with a display screen 5; the adsorption device 22 is connected with the base 24 through the position adjusting device 21; the adsorption device 22 is used for adsorbing the grating. Optionally, the suction device 22 includes a mounting structure 221, where a mounting through hole 222 is provided on the mounting structure 221, and is used for placing an air pipe connected to the suction cup 224, where the other end of the air pipe is connected to a vacuum pump, so that the suction force of the suction cup 224 to the grating can be controlled by the vacuum pump subsequently, and an observation area 223 is further provided on the mounting structure 221, specifically, the observation area 223 may be located in the middle of the mounting structure 221, and is used for providing a channel for collecting a field of view for the image capturing device 1, and of course, the observation area 223 may also be located in other areas of the mounting structure 221, such as a side edge.

It will be appreciated that referring to fig. 1, the mounting structure 221 may include two mounting members with a space therebetween; so that the two mounting members constitute the above-mentioned viewing area 223, the viewing area 223 may be formed by providing a predetermined through hole in the mounting structure 221. In practical applications, the image capturing apparatus 1 may select a setting position according to needs, and does not necessarily need to capture an image through the observation area 223, but the image capturing apparatus 1 needs to be set in the light emitting direction of the grating to capture a clear image.

Optionally, referring to fig. 1 and 2, the position adjusting device 21 may be configured to include a left-right adjusting mechanism, a front-rear adjusting mechanism, and a height adjusting mechanism 214 as required, so as to adjust the left-right, front-rear, and height directions of the grating, so as to achieve more accurate alignment and lamination between the grating and the display screen 5. Alternatively, the position adjusting device 21 may be manually controlled, or the position adjusting device 21 may be electrically connected to the processor 3, and the processor 3 may perform automatic position adjustment control; when the manual control is adopted, the left and right positions of the grating can be specifically adjusted by rotating the left and right adjusting knob 211, the front and rear positions of the grating can be adjusted by rotating the front and rear adjusting knob 212, and the height position of the grating can be adjusted by rotating the height adjusting knob 213.

Alternatively, the height adjusting mechanism 214 may be a scissor lift device as shown in fig. 2, a cylinder lift device, a rail lift device, or the like, which is not limited herein.

Optionally, the base 24 is provided with a support structure 23, and in order to further improve alignment efficiency, the support structure 23 is connected with the base 24 through a rotation structure, so that the rotation angle of the rotation mechanism 25 can be controlled manually or by the processor 3, and further, the placement angle of the display screen 5 on the support structure 23 on the xy plane is realized. Optionally, for the actual fitting procedure, the backlight module 4 and the display screen 5 thereon need to be placed on the supporting structure 23 in advance. The display 5 may optionally be a liquid crystal display (Liquid Crystal Display, LCD).

Alternatively, the processor 3 may be specifically disposed on an electronic device, which may be a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.

Fig. 3 is a flowchart illustrating a grating alignment detection method according to an embodiment of the application, which can be applied to the processor in fig. 1. It is noted that the present specification provides method operational steps as described in the examples or flowcharts, but may include more or fewer operational steps based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. In actual system or product execution, the methods illustrated in the embodiments or figures may be performed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment). As shown in fig. 3, the method may include:

S301: and determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen.

For example, referring to fig. 4 and 5, the first alignment mark includes a third mark 63 and a fourth mark 64, and the second alignment mark includes a first mark 53 and a second mark 54; the display screen 5 includes a display area 52 and a bezel area 51; two ends of the diagonal line of the frame area 51 are respectively provided with a first mark 53, and the display area 52 is provided with a pixel array; the edge pixel points 55 of the pixel array corresponding to the two ends of the diagonal line of the display area 52 are used as the second marks 54. With continued reference to fig. 5, the grating 6 includes a grating-free region 61 and a grating region 62 corresponding to the position of the display region 52; the no grating area 61 is provided with a third mark 63 corresponding to the position of the first mark 53; a fourth marker 64 is provided at each diagonal end of the grating region 62. Wherein the first identifier 53 corresponds to the third identifier 63 in position, and the second identifier 54 corresponds to the fourth identifier 64 in position. Alternatively, the grating 6 may be a lenticular lens, where the lenticular lens includes a plurality of lenticular lenses 65 arranged in an array, and each lenticular lens 65 may be as shown in fig. 6, and since the grating 6 needs to be attached to the display screen 5 after the alignment detection is completed, an adhesive layer 7 is disposed below the grating 6 provided by the present application, and the adhesive layer 7 may be coated on the grating 6 or attached to the grating 6, which is not limited herein. Alternatively, the plurality of lenticular lenses 65 may be arranged along the length of the grating 6, i.e. in the same direction as the arrangement of the pixel dots 55 in the pixel array on the display screen 5.

It should be understood that, in order to further improve the alignment accuracy, the number of the first marks 53 may be 4, specifically, the marks shown in the upper left and right corners of the frame area 51 may be respectively configured as cross marks, the lower left and right corners of the frame area 51 may be respectively configured as fork marks, that is, the first marks 53 include two types of marks, and the marks of the third marks 63 are correspondingly the same as the first marks 53, and of course, the 4 first marks 53 may also be the same. The number of the second marks 54 may be set to 4, specifically, may be pixels corresponding to four corners of the display area 52, and the number of the fourth marks 64 is also 4 (refer to fig. 5). In fact, the first mark 53 and the second mark 54 are not limited to the above numbers, and may be 3, 5, 6, or the like, as needed.

Alternatively, in order to improve the 3D imaging effect of the 3DHUD optical system after the bonded grating and display screen are applied to the 3DHUD optical system, the display screen and the grating may be set to have the same size. The size of the pixel array of the display screen may be 1280×640, or may be 640×640, 640×480, or the like, which is not limited herein, and each pixel in the pixel array actually further includes 3 sub-pixel points, which respectively correspond to one of the three primary colors of RGB.

Alternatively, the length of the display screen may be 103±0.1mm, and the width may be 25±0.1mm; the display area may be 92.5 + -0.1 mm in length and 46.2 + -0.1 mm in width.

Alternatively, the substrate material of the grating may be glass, with a refractive index of 1.589 and a thickness of 0.175+ -0.01 mm; the material of the grating may be an ultraviolet light curing material, also referred to as UV material, and the refractive index of the grating is 1.5.

Alternatively, the adhesive layer may be an optical cement (Optically Clear Adhesive, OCG) and the thickness may be 50mm.

It should be noted that the present application is not limited to the size data of the grating and the display screen in the above example, and in the case where only one value is exemplified, a value in the vicinity of the value is actually included.

In one possible embodiment, referring to fig. 7, the fourth marker 64 includes a first marker strip 641 and a second marker strip 642 that intersect at a point, which may be referred to as an L-shape; when the alignment of the grating 6 and the display screen is completed, the inner side of the first mark 641 and the edge of the second mark 54 in the length direction can be attached; the inner side of the second mark 642 can be bonded to the edge of the second mark 54 in the width direction, and the second mark 54 shown in fig. 7 includes 3 edge pixel points 55, and 1, 2, or 4 equal number of edge pixel points 55 may be selected as the second mark 54 as needed. The length direction of the second mark 54 refers to the length direction of 1 pixel 55, and the width direction of the second mark 54 refers to the width direction of 1 pixel 55.

With continued reference to fig. 4, each pixel 55 in the pixel array may be disposed parallel to the y direction, and accordingly, the first stripe 641 of the fourth mark 64 aligned with the first stripe is also parallel to the y direction. Referring to fig. 8, fig. 8 is a top view of a grating and a display screen when alignment is completed according to an embodiment of the present application. Each pixel point 55 of the pixel array of the display screen may also be disposed obliquely with a certain angle with respect to the y direction (as shown in fig. 8), and correspondingly, the first identification strip 641 of the fourth identification 64 attached to the pixel array also has an angle with respect to the y direction, and the shape of the fourth identification 64 related to the pixel array needs to be adaptively adjusted according to the change of the arrangement of the pixel array.

In a possible embodiment, the alignment of the display screen and the grating may be continuously adjusted by the human eye through the image including the identifier acquired by the image acquisition device until the alignment of the first identifier and the third identifier is qualified, and if the alignment of the second identifier and the fourth identifier is qualified, selecting the relevant control of "completing the alignment of the identifier" or "failing to align the identifier" through the console or the relevant control page, so as to generate a matching result, and sending the matching result to the processor, so that after the processor acquires the matching result, the following steps S303-S307 may be executed based on the matching result. In another possible embodiment, to avoid the problems of poor alignment reliability and low alignment efficiency caused by manually observing alignment, the matching result may also be determined by analyzing the image containing the identifier. The specific implementation manner of step S301 may also be: determining the coincidence ratio of the two first marks with the third marks corresponding to the positions respectively; determining the distance between the fourth mark and the second mark corresponding to the position under the condition that the coincidence ratio of the two second alignment marks and the third mark corresponding to the position is larger than or equal to a first preset threshold value; and determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen based on the distance between the fourth mark and the second mark corresponding to the position and a second preset threshold value. Optionally, for each first identifier, determining the contact ratio of the first identifier and the third identifier corresponding to the position may include: acquiring the position information of each edge of the first mark and the position information of each edge of the third mark, determining a distance value between each edge of the first mark and the edge of the third mark corresponding to the position based on the position information of each edge of the first mark and the position information of each edge of the third mark, and determining a maximum distance value from the distance values between each edge of the first mark and the edge of the third mark corresponding to the position; and determining the coincidence degree of the first mark and the third mark corresponding to the position based on the maximum distance value and the size of the first mark. Referring to fig. 4, for example, assume that the maximum distance value of the first mark 53 and the third mark 63 corresponding to the position is the difference between the edges of the two marks arranged along the x direction, and is set to A1; the length of the first mark 53, i.e., the length a in the x-direction; then, the coincidence of the first mark 53 and the third mark 63=a1/a. Alternatively, the maximum distance value may be replaced by an average distance value of the distance values between the edges of the first identifier 53 and the edges of the third identifier 63 corresponding to the position, and then the contact ratio between the first identifier 53 and the third identifier 63 corresponding to the position may be determined based on the average distance value and the size of the first identifier.

In a possible embodiment, the determining, based on the distance between the fourth identifier and the second identifier corresponding to the position and the second preset threshold, a matching result between the first alignment identifier on the grating and the second alignment identifier on the display screen includes: comparing the distance between the fourth mark and the second mark corresponding to the position with a second preset threshold value to obtain a comparison result; generating a first matching result under the condition that the comparison result indicates that the distance exceeds a second preset threshold value; the first matching result represents that the first alignment mark and the second alignment mark are successfully matched; generating a second matching result under the condition that the comparison result indicates that the distance does not exceed a second preset threshold value; the second matching result represents that the first alignment mark and the second alignment mark fail to be matched. Referring to fig. 7, the distance between the fourth mark 64 and the second mark 54 corresponding to the position may refer to the distance between the inner side of the fourth mark 64 and the side edge of the adjacent pixel 55, such as the distance between the inner side of the first mark 641 and the left side edge of the adjacent pixel 55, and the distance between the inner side of the second mark 642 and the upper edge of the adjacent pixel 55, which are the distance between the fourth mark 64 and the second mark 54 corresponding to the position, and optionally, the maximum distance between the first mark 641 (i.e. the distance between the inner side of the first mark 641 and the left side edge of the adjacent pixel 55) and the distance between the second mark 642 (i.e. the distance between the inner side of the second mark 642 and the upper edge of the adjacent pixel 55) may be used as the distance between the fourth mark 64 and the second mark 54 corresponding to the position, or the average value of the two may be used as the distance between the fourth mark 64 and the second mark 54 corresponding to the position.

It will be understood from the foregoing description that, in practice, the number of the first identifiers and the number of the second identifiers are not limited to 4 as shown in fig. 4 and 5 and 2 as described above, but may be set to 1, 3, or 5, etc. as required, the number of the corresponding identifiers needs to be consistent regardless of the setting generation, that is, the number of the first identifiers is equal to the number of the third identifiers, the number of the second identifiers is equal to the number of the fourth identifiers, and the matching result of the first identifiers and the third identifiers may be determined in step S301 specifically by determining the overlap ratio of the first identifiers and the third identifiers first, and then determining the final matching result by determining whether the overlap ratio meets the preset threshold requirement, and the second identifiers and the fourth identifiers may be determined by determining the distance between the second identifiers and the inner sides of the fourth identifiers.

In a possible embodiment, after step S301, the method further comprises: generating a second alignment result under the condition that the matching result indicates that the first alignment mark and the second alignment mark fail to be matched; and the second alignment result represents that the alignment of the grating and the display screen is unqualified. The reason for the failure of the matching may be that the size of the grating or the display screen or the position size of the mark is not satisfied, so that the related personnel are required to check the size related aspect later.

S303: and under the condition that the matching result indicates that the first alignment mark and the second alignment mark are successfully matched, acquiring a moire image corresponding to the display screen.

For example, please refer to fig. 9, which illustrates a moire image provided by the embodiment of the present application, in which the moire image obtained by directly capturing an image of a display screen is obtained when 1 lenticular lens is arranged to cover 4 pixels, and in fig. 9, the stripes of the area with black and white stripes correspond to 4 pixels and 4 pixels are sequentially arranged. In the case of qualified alignment, the moire image acquired by the image acquisition device may be similar to the image shown in fig. 9, that is, the plurality of moire images are uniformly arranged at intervals, and the moire images are straight lines, specifically may be a color moire image, where the moire images in the color moire image are parallel to the vertical edges of the display area shown in fig. 9; in the case of misalignment, the moire image acquired by the image acquisition device may be an image as shown in fig. 10, that is, a plurality of moire images are unevenly spaced, and the moire images are distorted.

Optionally, in step S303, a moire image corresponding to the display screen may be acquired by using an image capturing device, which may specifically be a charge coupled device (Charge Coupled Device, CCD) camera.

Optionally, when the display screen is lightened, the pixel particles of the pixel array can be obviously seen, so that the alignment condition of the second mark and the fourth mark can be accurately judged; when the display screen is not lightened, the reflectivity of the display screen is particularly low, so that the display screen is inconvenient to observe, and an infrared camera in the CCD camera can be selected as image acquisition equipment, so that acquired images are clearer.

S305: determining the gap distance corresponding to at least two mole lines in the mole line image and the shape of the mole lines in the mole line image; the gap distance corresponding to a moire includes the distance between the moire and all of its neighboring moire.

Alternatively, the gap distance corresponding to the moire may be the sum of the distances between the moire and all the adjacent moire, or may be a distance set formed by the distances between the moire and all the adjacent moire. Referring to fig. 9 and 10, when the alignment of the grating and the display screen is acceptable and unacceptable, the moire pattern may be a straight line and parallel to the side of the display area of the display screen when the alignment of the grating and the display screen is acceptable, and may be a curved line or a straight line but not parallel to the side of the display area of the display screen when the alignment of the grating and the display screen is unacceptable.

S307: if the difference value between the gap distances corresponding to the at least two mole patterns is smaller than or equal to the preset distance, generating a first alignment result, wherein the mole patterns in the mole pattern image are in straight lines and parallel to the side edge of the display area of the display screen; the first alignment result represents that the alignment of the grating and the display screen is qualified; otherwise, a second alignment result is generated.

Optionally, when the gap distances corresponding to the moire patterns are distance sets, in step S307, each of the gap distances needs to be compared with a preset distance, and only if all the distances in the gap distances are smaller than or equal to the preset distance, the first alignment result is generated. Three, four, or two mole patterns with a predetermined distance (e.g., a plurality of mole patterns spaced between two mole patterns) may be selected to execute step S307 as needed, which is not limited herein.

Alternatively, when specifically judging whether the shape of the moire in the moire image is a straight line, the moire may be determined by determining the curvature of the moire, if the curvature is 0, the moire is a straight line, otherwise, the moire is a non-straight line.

In the determining the shape of the moire in the moire image, specifically, any one moire in the moire image may be selected to determine whether the moire is a straight line or not and whether the moire is parallel to the side of the display area or not; the determination may be performed by selecting a plurality of moire images, or by selecting an average result of the moire measurement results in the moire images, for example, after obtaining the curvatures corresponding to the plurality of moire images, the curvatures of the plurality of moire images may be arithmetically averaged to obtain a curvature average value, and then the determination result corresponding to the moire shape of the moire image may be obtained by the curvature average value and the parallel condition of the plurality of moire images with the side of the display area.

In the application, the alignment mark is utilized to perform alignment, and the obtained matching result indicates that the first alignment mark and the second alignment mark are successfully matched, if the subsequent alignment result obtained by analyzing and judging the moire image is the second alignment result, the alignment result may be caused by uneven adsorption force or uneven placement of the grating or the display screen, or the positions and the sizes of the alignment points on the screen and the grating membrane have tolerance although the alignment points are aligned, or the thickness of the bonding layer below the grating is uneven, so that related personnel are required to manually determine the reasons. According to the embodiment of the application, the alignment detection is performed based on the pixel-level alignment mark, and meanwhile, the Moire image is considered, so that the alignment detection precision is effectively improved.

Corresponding to the grating alignment detection methods provided in the foregoing embodiments, the embodiments of the present application further provide a grating alignment detection device, and since the grating alignment detection device provided in the embodiments of the present application corresponds to the grating alignment detection method provided in the foregoing embodiments, implementation of the foregoing grating alignment detection method is also applicable to the grating alignment detection device provided in the embodiments, and will not be described in detail in the embodiments.

Referring to fig. 11, a schematic structural diagram of a grating alignment detection device according to an embodiment of the present application is shown, where the device has a function of implementing the grating alignment detection method in the above method embodiment, and the function may be implemented by hardware or implemented by executing corresponding software by hardware. As shown in fig. 11, the grating alignment detection apparatus 1100 may include:

the result determining module 1101 is configured to determine a matching result of the first alignment identifier on the grating and the second alignment identifier on the display screen;

an obtaining module 1103, configured to obtain a moire image corresponding to the display screen when the matching result indicates that the first alignment identifier and the second alignment identifier are successfully matched;

a gap distance determining module 1105, configured to determine a gap distance corresponding to at least two moire patterns in the moire pattern image and a shape of the moire pattern in the moire pattern image; the gap distance corresponding to the mole pattern comprises the distance between the mole pattern and all adjacent mole patterns;

a generating module 1107, configured to generate a first alignment result if a difference between gap distances corresponding to at least two moire patterns is less than or equal to a preset distance, and a moire pattern in the moire pattern image is in a shape of a straight line and is parallel to a side edge of a display area of the display screen; the first alignment result represents that the alignment of the grating and the display screen is qualified; otherwise, generating a second alignment result; and the second alignment result represents that the alignment of the grating and the display screen is unqualified.

In one possible embodiment, the display screen includes a display area and a bezel area; two ends of a diagonal line of the frame area are respectively provided with a first mark; the display area is provided with a pixel array; taking edge pixel points of the pixel array corresponding to two ends of the diagonal line of the display area as second marks; the grating comprises a grating-free region and a grating region corresponding to the display region in position; the grating-free area is provided with a third mark corresponding to the first mark position; the two ends of the diagonal line of the grating area are respectively provided with a fourth mark; the result determining module is used for determining the coincidence ratio of the two first identifiers and the third identifiers corresponding to the positions respectively;

In a possible embodiment, the result determining module is configured to compare a distance between the fourth identifier and the second identifier corresponding to the position with a second preset threshold value to obtain a comparison result;

In a possible embodiment, the generating module is configured to generate the second alignment result when the matching result indicates that the first alignment identifier and the second alignment identifier fail to match.

In one possible embodiment, the acquiring module is configured to acquire, by using the image capturing device, a moire image corresponding to the display screen.

It should be noted that, in the apparatus provided in the foregoing embodiment, when implementing the functions thereof, only the division of the foregoing functional modules is used as an example, in practical application, the foregoing functional allocation may be implemented by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to implement all or part of the functions described above. In addition, the apparatus and the method embodiments provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the apparatus and the method embodiments are detailed in the method embodiments and are not repeated herein.

On the other hand, referring to fig. 12, a method for aligning and attaching a grating is provided, which is applied to the above-mentioned grating aligning system, and the method includes:

s1201: and acquiring the position information of the grating and the position information of the display screen.

Before step S1201, the backlight module needs to be turned on, that is, the backlight module is turned on, then the display screen is placed thereon, and then the vacuum pump is turned on, so that the suction cup can uniformly adsorb the grating. And then, the alignment operation needs to be started, the grating is moved to a position 1-2 mm away from the display screen, and the positions of the grating and the display screen are finely adjusted through the position adjusting device, so that the first alignment mark and the second alignment mark are matched as much as possible.

S1203: and generating a descending adjustment signal based on the first alignment result, the position information of the grating and the position information of the display screen.

When the alignment result obtained by the grating alignment detection method is the first alignment result, the target position of the grating to be lowered can be determined based on the position information of the grating and the position information of the display screen. The down-regulation signal contains down-target position information.

S1205: the telescopic height of the position adjusting device is controlled based on the descending adjusting signal so as to enable the adsorption device connected with the position adjusting device to descend to a preset position, and further enable the grating to be attached to the display screen.

Based on the above steps S1201-S1205, the attachment of the grating and the display screen can be completed, and due to the accurate positioning process, the attached grating, display screen and backlight module structure can be applied to the head-up display device, so that the head-up display device has a better 3D display effect.

On the other hand, referring to fig. 13, there is provided a grating alignment detection apparatus, disposed in a processor of the grating alignment system, the grating alignment detection apparatus 1300, including:

a position information obtaining module 1301, configured to obtain position information of the grating and position information of the display screen;

a signal generating module 1303, configured to generate a descent control signal based on the first alignment result, the position information of the grating, and the position information of the display screen;

and the control module 1305 is used for controlling the telescopic height of the position adjusting device based on the descending adjusting signal so as to realize that the adsorption device connected with the position adjusting device descends to a preset position and further realize the lamination of the grating and the display screen.

The grating alignment bonding device provided by the embodiment of the present application corresponds to the grating alignment bonding method provided by the above embodiment, so that the implementation of the grating alignment bonding method is also applicable to the grating alignment bonding device provided by the embodiment, and will not be described in detail in the embodiment.

It should be noted that: the sequence of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And the foregoing description has been directed to specific embodiments of this specification. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.

Claims

1. The grating alignment detection method is characterized by comprising the following steps:

acquiring a moire image corresponding to the display screen under the condition that the matching result indicates that the first alignment mark and the second alignment mark are successfully matched;

determining the gap distance corresponding to at least two mole lines in the mole line image and the shape of the mole line in the mole line image; the gap distance corresponding to the mole pattern comprises the distance between the mole pattern and all adjacent mole patterns;

if the difference value between the gap distances corresponding to the at least two mole patterns is smaller than or equal to a preset distance, the mole patterns in the mole pattern image are in straight lines and parallel to the side edges of the display area of the display screen, and a first alignment result is generated; the first alignment result represents that the alignment of the grating and the display screen is qualified; otherwise, generating a second alignment result; and the second alignment result represents that the alignment of the grating and the display screen is unqualified.

2. The method of claim 1, wherein the display screen includes the display area and a bezel area; two ends of a diagonal line of the frame area are respectively provided with a first mark; the display area is provided with a pixel array; taking edge pixel points of the pixel array, which respectively correspond to two ends of a diagonal line of the display area, as second marks; the grating comprises a grating-free region and a grating region corresponding to the display region in position; the no grating area is provided with a third mark corresponding to the first mark position; the two ends of the diagonal line of the grating area are respectively provided with a fourth mark; the determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen comprises the following steps:

determining the coincidence ratio of the two first marks and the third marks corresponding to the positions respectively;

determining a distance between the fourth mark and the second mark corresponding to the position under the condition that the coincidence ratio of the two second alignment marks and the third mark corresponding to the position is larger than or equal to a first preset threshold value;

3. The method of claim 2, wherein the determining a matching result of the first alignment mark on the grating and the second alignment mark on the display screen based on the distance between the fourth mark and the second mark corresponding to the position and a second preset threshold value comprises:

comparing the distance between the fourth mark and the second mark corresponding to the position with the second preset threshold value to obtain a comparison result;

generating a first matching result under the condition that the comparison result indicates that the distance exceeds the second preset threshold value; the first matching result represents that the first alignment mark and the second alignment mark are successfully matched;

generating a second matching result under the condition that the comparison result indicates that the distance does not exceed the second preset threshold value; and the second matching result represents that the first alignment mark and the second alignment mark are failed to be matched.

4. The method of claim 2, wherein the first identifier comprises a cross identifier and a fork identifier;

the fourth mark comprises a first mark strip and a second mark strip which are intersected at a point; the inner side of the first mark strip can be attached to the edge of the second mark in the length direction; the inner side of the second mark strip can be attached to the edge of the second mark in the width direction.

5. The method of claim 1, wherein after determining a match between the first alignment mark on the grating and the second alignment mark on the display screen, the method further comprises:

and generating the second alignment result under the condition that the matching result indicates that the first alignment mark and the second alignment mark are failed to be matched.

6. The method of claim 1, wherein the obtaining the moire image corresponding to the display screen comprises:

and acquiring the Moire image corresponding to the display screen by using an image acquisition device.

7. A grating alignment detection device, the device comprising:

The result generation module is used for generating a first alignment result if the difference value between the gap distances corresponding to the at least two mole patterns is smaller than or equal to a preset distance, and the mole patterns in the mole pattern image are in straight lines and parallel to the side edge of the display area of the display screen; the first alignment result represents that the alignment of the grating and the display screen is qualified; otherwise, generating a second alignment result; and the second alignment result represents that the alignment of the grating and the display screen is unqualified.

8. The grating alignment system is characterized by comprising image acquisition equipment, an alignment laminating device and a processor; the processor is provided with the grating alignment detection device as claimed in claim 7;

the alignment and lamination device comprises a base and an adsorption device which are oppositely arranged; the display screen is arranged on the base; the adsorption device is connected with the base through a position adjusting device; the adsorption device is used for adsorbing the grating.

9. A method for fitting alignment of a grating, applied to the alignment system of claim 8, comprising:

and controlling the telescopic height of the position adjusting device based on the descending adjusting signal so as to enable the adsorption device connected with the position adjusting device to descend to a preset position, and further enabling the grating to be attached to the display screen.

10. A grating alignment bonding apparatus, disposed on a processor of the grating alignment system of claim 8, the apparatus comprising:

and the control module is used for controlling the telescopic height of the position adjusting device based on the descending adjusting signal so as to enable the adsorption device connected with the position adjusting device to descend to a preset position, and further enable the grating to be attached to the display screen.