A method and device for bonding segment code screen and backlight sheet

Abstract

The present invention relates to a method and device for bonding a segment code screen and a backlight sheet, and the bonding method comprises: placing the backlight sheet and the segment code screen on a placement platform, photographing a first positioning mark and a second positioning mark, determining two first mark coordinates and two second mark coordinates; determining a first preset positioning coordinate according to the two first mark coordinates, determining a second preset positioning coordinate according to the two second mark coordinates, and determining the angle between a first connecting line of the two first mark coordinates and a second connecting line of the two second mark coordinates; controlling a grasping mechanism to grasp and drive the backlight sheet to move and rotate to the top of the segment code screen, aligning the first preset positioning point and the second preset positioning point, and making the first connecting line parallel to the second connecting line, and then moving the backlight sheet downward to bond with the segment code screen. The backlight sheet and the segment code screen can be bonded and adhered with high precision, improving the yield rate and bonding efficiency of the segment code display screen, and avoiding damage to the eyes of operators caused by strong light.

Description

Technical Field

[0001] The present invention relates to the technical field of laminating a backlight sheet and a segment code screen, and in particular to a method and a device for laminating a segment code screen and a backlight sheet. Background Art

[0002] When producing segment code display screens, one of the important steps is to bond the segment code screen to the backlight sheet. There are multiple light-transmitting areas in the backlight sheet. When the two are bonded together, the light-transmitting area of ​​the backlight sheet corresponds to the liquid crystal area of ​​the segment code screen. For segment code display screens with relatively simple display effects, the light-transmitting area can be set larger than the liquid crystal area. In this case, when bonding the segment code screen to the backlight sheet, the segment code screen and the backlight sheet can be positioned by means of positioning blocks, and then the two can be bonded together to meet the assembly requirements of such segment code display screens.

[0003] However, with the demand for complex images displayed on segment code display screens, the shape and size of the light-transmitting area of ​​the backlight sheet and the liquid crystal area of ​​the segment code screen are made consistent. This requires that after the segment code screen and the backlight sheet are bonded, the light-transmitting area and the liquid crystal area basically overlap front and back, thus putting forward higher requirements on the bonding accuracy of the segment code screen and the backlight sheet. If the positioning block positioning bonding method is still used, the accuracy requirement cannot be met. Therefore, the existing technology mostly uses manual bonding for the bonding of such segment code screens and backlight sheets, but due to the individual differences of bonding operators, there are still problems of low product yield and low bonding efficiency. Moreover, the bonding is carried out under strong light conditions, which will also cause certain damage to the eyes of the operator. Summary of the invention

[0004] Based on the above situation, the main purpose of the present invention is to provide a method and a device for bonding a segment code screen and a backlight sheet, which can respectively perform position positioning and angle positioning on the backlight sheet and the segment code screen, so that the backlight sheet and the segment code screen can be bonded with high precision, thereby improving the yield rate and bonding efficiency of the segment code display screen and avoiding damage to the operator's eyes caused by strong light.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A method for bonding a segment code screen to a backlight sheet.

[0007] The backlight sheet is provided with two first positioning marks and a first preset positioning point; the segment code screen is provided with two second positioning marks corresponding to the two first positioning marks, and a second preset positioning point corresponding to the first preset positioning point;

[0008] The bonding method comprises the steps of:

[0009] S1100, placing the backlight sheet and the segment code screen on a placement platform, photographing the first positioning mark and the second positioning mark respectively, and determining the first mark coordinates of the two first positioning marks in a mechanical coordinate system and the second mark coordinates of the two second positioning marks in the mechanical coordinate system according to the photographed target image information;

[0010] S1200, determining a first preset positioning coordinate of the first preset positioning point in the mechanical coordinate system according to the two first mark coordinates, determining a second preset positioning coordinate of the second preset positioning point in the mechanical coordinate system according to the two second mark coordinates, and determining a rotation angle between a first connecting line of the two first mark coordinates and a second connecting line of the two second mark coordinates;

[0011] S1300, according to the first preset positioning coordinates, the second preset positioning coordinates and the rotation angle, the grasping mechanism is controlled to grasp and drive the backlight sheet to move and rotate to the top of the segment code screen, so that the first preset positioning point and the second preset positioning point are aligned, and the first connecting line is parallel to the second connecting line, and then the backlight sheet is moved downward until it is in contact with the segment code screen, so that the two first positioning marks and the two second positioning marks coincide with each other.

[0012] Preferably, the first preset positioning point is the midpoint of the two first positioning marks and is the center of the backlight sheet; the second preset positioning point is the midpoint of the two second positioning marks.

[0013] Preferably, the two first positioning marks are located at two opposite corners of the backlight sheet.

[0014] Preferably, the gripping mechanism is provided with a horizontal auxiliary line;

[0015] In step S1300, before the grasping mechanism grasps the backlight film, the grasping mechanism is adjusted according to the backlight film placement angle and the preset initial angle so that the auxiliary line is parallel to the first connecting line, and the grasping mechanism is moved through the first marking coordinate so that the connecting line between the center of the auxiliary line and the center of the backlight film is parallel to the height direction.

[0016] Preferably, a horizontal auxiliary line is provided on the gripping mechanism, and the angle between the auxiliary line and the X-axis of the mechanical coordinate system has a preset initial angle;

[0017] In step S1300, before the grabbing mechanism grabs the backlight sheet, the grabbing mechanism is adjusted from the initial angle to the grabbing angle; after the backlight sheet and the segment screen are attached, the grabbing mechanism is rotated to the initial angle again;

[0018] Wherein, at the grabbing angle, the auxiliary line is parallel to the first connecting line.

[0019] Preferably, the placement platform is provided with a first limit block and a second limit block, the first limit block defines the placement position of the backlight sheet, and the second limit block defines the placement position of the segment code screen;

[0020] When the backlight sheet is placed at the backlight sheet placement position and the segment code screen is placed at the segment code screen placement position, there is a shooting point directly above each of the first positioning marks and each of the second positioning marks;

[0021] In step S1100, the backlight sheet is placed at the backlight sheet placement position, the segment code screen is placed at the segment code screen placement position, and the corresponding first positioning mark or the second positioning mark is photographed at each of the photographing points.

[0022] Preferably, in step S1100, the positioning mark is photographed by a photographic device to obtain target image information; the target pixel coordinates of the positioning mark in the image coordinate system are identified, and the mark coordinates of the positioning mark in the mechanical coordinate system are determined based on a preset comparison relationship between the image coordinate system and the mechanical coordinate system.

[0023] Preferably, the mechanical coordinate system is provided with standard positioning coordinates (X1, Y1), and the image coordinate system is provided with standard pixel coordinates (x1, y1) corresponding to the standard positioning coordinates;

[0024] The X-axis of the mechanical coordinate system is parallel to the X-axis of the image coordinate system, and the positive directions of the two are consistent; the Y-axis is parallel to the Y-axis, and the positive directions of the two are consistent;

[0025] The mark coordinates (X2, Y2) of the positioning mark in the mechanical coordinate system are determined according to the target pixel coordinates (x2, y2) and the comparison relationship; the comparison relationship satisfies:

[0026] X2=X1+(x2-x1)*k;

[0027] Y2=Y1+(y2-y1)*k;

[0028] Wherein, k is the proportional relationship between the image coordinate system and the mechanical coordinate system.

[0029] The present invention also relates to a bonding device for a segment code screen and a backlight sheet, wherein the backlight sheet is bonded to the segment code screen using the above bonding method, and the bonding device has a working space, wherein a three-axis moving mechanism, a gripping mechanism, a camera device and a placing platform are arranged in the working space;

[0030] The placement platform is arranged at the lower part of the workspace, and a placement position for the segment code screen and a placement position for the backlight sheet are arranged on the placement platform;

[0031] The grabbing mechanism is installed on the three-axis moving mechanism so as to be driven to move in the working space by the three-axis moving mechanism, and the grabbing mechanism can rotate around the vertical direction;

[0032] The photographic device is arranged in the space and is used for photographing each of the first positioning mark and the second positioning mark.

[0033] Preferably, the number of the camera device is one and it is installed on the three-axis moving mechanism.

[0034] In the present invention, the backlight sheet and the segment code screen are photographed respectively by a photographic device, and the first preset positioning coordinates (position positioning of the backlight sheet) are determined according to the two first mark coordinates, the second preset positioning coordinates (position positioning of the segment code screen) are determined according to the two second mark coordinates, and the angle between the two is determined according to the first connecting line and the second connecting line. In this way, the grasping mechanism can grasp the backlight sheet with high precision, and move the backlight sheet to the top of the segment code screen with high precision, and can also adjust the rotation angle of the backlight sheet, so that the backlight sheet and the segment code screen can be fitted with high precision; the present invention can improve the yield rate of the fitting of the backlight sheet and the segment code screen, and realize automatic fitting, improve the fitting efficiency, and avoid damage to the operator's eyes caused by strong light.

[0035] Other beneficial effects of the present invention will be explained in the specific implementation manner through the introduction of specific technical features and technical solutions. Through the introduction of these technical features and technical solutions, those skilled in the art should be able to understand the beneficial technical effects brought about by the technical features and technical solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following will describe a preferred embodiment of a method for bonding a segment code screen to a backlight sheet according to the present invention with reference to the accompanying drawings.

[0037] Figure 1 The present invention is a flowchart of a method for bonding a segment code screen to a backlight sheet. DETAILED DESCRIPTION

[0038] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0039] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0040] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0041] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] The present invention provides a method for bonding a segment code screen and a backlight film. The bonding method is implemented based on a bonding device. The bonding device includes a workspace, in which a horizontal placement platform, a camera device, and a movable grabbing mechanism are arranged. The placement platform is provided with a segment code screen placement position and a backlight film placement position.

[0043] Two first positioning marks and a first preset positioning point are provided on the backlight sheet. The first positioning marks can be perceived by the outside world in a certain way, so that the positions of the two first positioning marks can be intuitively determined. For example, the first positioning mark is a colored mark, or the first positioning mark is a light-transmitting area that can transmit light, and the first positioning mark is illuminated by the irradiation of light; the first preset positioning point is a virtual point, and the positional relationship of the first preset positioning point relative to the two first positioning marks is fixed, that is, the position of the first preset positioning point can be determined according to the positions of the two first positioning marks.

[0044] The segment code screen is provided with two second positioning marks corresponding to the two first positioning marks, and a second preset positioning point corresponding to the first preset positioning point; the shape of the second positioning mark is the same as the first positioning mark, the second positioning mark can be a colored mark or a light-transmitting area, the second preset positioning is a virtual point, and the positional relationship relative to the two second positioning marks is fixed.

[0045] The distance between the two first positioning marks is equal to the distance between the two second positioning marks. When the backlight sheet and the segment code screen are attached, the two first positioning marks overlap with the two second positioning marks respectively, and the first preset positioning point overlaps with the second preset positioning point.

[0046] See also Figure 1 , the bonding method comprises the steps of:

[0047] S1100, placing the backlight sheet and the segment code screen on a placement platform, photographing the first positioning mark and the second positioning mark respectively, and determining the first mark coordinates of the two first positioning marks in the mechanical coordinate system and the second mark coordinates of the two second positioning marks in the mechanical coordinate system according to the photographed target image information;

[0048] S1200, determining a first preset positioning coordinate of a first preset positioning point in a mechanical coordinate system according to two first marking coordinates, determining a second preset positioning coordinate of a second preset positioning point in the mechanical coordinate system according to two second marking coordinates, and determining a rotation angle between a first connecting line of the two first marking coordinates and a second connecting line of the two second marking coordinates;

[0049] S1300, according to the first preset positioning coordinates, the second preset positioning coordinates and the rotation angle, the grasping mechanism grasps and drives the backlight sheet to move and rotate to the top of the segment code screen, so that the first preset positioning point and the second preset positioning point are aligned, and the first connecting line is parallel to the second connecting line, and then the backlight sheet is moved downward until it is in contact with the segment code screen, so that the two first positioning marks coincide with the two second positioning marks.

[0050] In the present invention, the purpose is that when the backlight sheet and the segment code screen are attached, the two first positioning marks coincide with the two second positioning marks, so that the backlight sheet and the segment code screen can be attached with high precision. To achieve this purpose, the workspace has a corresponding mechanical coordinate system, which is a three-dimensional coordinate system. The mechanical coordinate system has an X-axis, a Y-axis and a Z-axis, wherein the plane formed by the X-axis and the Y-axis is parallel to the horizontal plane, and the Z-axis is the vertical direction. After the backlight sheet and the segment code screen are placed on the placement platform, since the placement platform is horizontally set and the Z-axis position of the placement platform on the mechanical coordinate system is constant, that is, the position of the backlight sheet and the segment code screen on the Z-axis is fixed, so the main purpose is the values ​​of the two first positioning points and the two second positioning points on the X-axis and the Y-axis.

[0051] In step S1100, each first positioning mark and second positioning mark is photographed at a specific position by a photographic device to obtain target image information. Since the position of the photographic device is specific and fixed, the coordinates of the first positioning mark and the second positioning mark in the mechanical coordinate system can be determined according to their positions in the target image information (the specific determination method is described in detail below), thereby obtaining the first mark coordinates of the first positioning mark in the mechanical coordinate system and the second mark coordinates of the second positioning mark in the mechanical coordinate system.

[0052] In step S1200, since the positional relationship of the first preset positioning point relative to the two first positioning marks is fixed and the coordinates of the two first marks have been determined, the first preset positioning coordinates (position positioning of the backlight film) of the first preset positioning point in the mechanical coordinate system can be determined based on the two first mark coordinates; similarly, the second preset positioning coordinates (position positioning of the segment code screen) of the second preset positioning point in the mechanical coordinate system can be determined based on the two second mark coordinates; in addition, the angle between the first connecting line between the two first mark coordinates and the X-axis of the mechanical coordinate system (the backlight film placement angle) can be determined, and the angle between the second connecting line and the X-axis of the mechanical coordinate system (the segment code screen placement angle) can be determined based on the second connecting line between the two second mark coordinates.

[0053] Since the two first marking coordinates and the first preset positioning coordinate have the same components on the Z axis, these three coordinates can be expressed as (X, Y); similarly, the two second marking coordinates and the second preset positioning coordinate can also be expressed as (X, Y). For example, the two first marking coordinates are (X a1 , Y a1 ) and (X a2 , Y a2 ), determine the first preset positioning coordinate (X) according to the two first marking coordinates a3 , Y a3 ); the coordinates of the two second markers are (X b1 , Y b1 ) and (X b2 , Y b2 ), determine the second preset positioning coordinates (X) according to the two second marking coordinates b3 , Y b3 );

[0054] Backlight placement angle

[0055] Segment screen placement angle

[0056] Therefore, it can be obtained that the rotation angle θ between the first connecting line and the second connecting line is θ=β-α.

[0057] Of course, the backlight placement angle may also be the angle between the first connecting line and the Y axis of the mechanical coordinate system. In this case, the segment code screen placement angle is also the angle between the first connecting line and the Y axis of the mechanical coordinate system.

[0058] In step S1300, according to the first preset positioning coordinates (X a3 , Y a3 ), in the mechanical coordinate system, the grabbing mechanism moves to the backlight grabbing coordinate (X a3 , Y a3, Z1), at this time, the grabbing mechanism is located directly above the first preset positioning point, that is, the grabbing coordinate is higher than the first preset positioning coordinate on the Z axis, and at the same time, the grabbing mechanism can rotate, and the rotation axis (axis) of the grabbing mechanism is parallel to the Z axis, and at this time, the rotation axis of the grabbing mechanism passes through the backlight sheet grabbing coordinate, that is, at this time, the rotation axis passes through the first preset positioning coordinate, the grabbing mechanism moves downward to contact the backlight sheet and grab the backlight sheet, and then the grabbing mechanism moves upward to separate the backlight sheet from the placement platform, and the grabbing mechanism rotates around its rotation axis by an angle θ, so that the first connecting line also rotates by θ, so that the first connecting line is parallel to the second connecting line, according to the second preset positioning coordinate (X b3 , Y b3 ), in the mechanical coordinate system, the gripping mechanism drives the backlight sheet to move to the backlight sheet fitting coordinate (X b3 , Y b3 , Z2), at this time, the grabbing mechanism is located directly above the segment code screen, and the rotating shaft passes through the second preset positioning coordinate, so the rotating shaft passes through the first preset positioning point and the second preset positioning point at the same time, that is, the first preset positioning point is located directly above the second preset positioning point, and the first connecting line is also parallel to the second connecting line, and the grabbing mechanism moves downward, so that when the backlight sheet and the segment code screen are bonded, the first preset positioning point coincides with the second preset positioning point, and the two first positioning marks coincide with the two second positioning marks, so that high-precision bonding is achieved between the backlight sheet and the segment code screen, and in the above process, the operator only needs to place the backlight sheet and the segment code screen on the placement platform respectively, so as to automatically position the first positioning mark and the second positioning mark, automatically grab the backlight sheet, and bond the backlight sheet and the segment code screen, thereby realizing automatic bonding of the backlight sheet and the segment code screen, reducing the labor intensity of the operator, and improving the yield rate of bonding between the two, and avoiding damage to the operator's eyes caused by strong light during bonding.

[0059] In the foregoing, Z1 and Z2 can be equal or unequal; the two first positioning marks are located at different positions of the backlight film, that is, the two first positioning marks will not be located at the same position of the backlight film; the two second positioning marks will not be located at the same position of the segment code screen, and the first preset positioning mark can be located at any position on the backlight film, and can even overlap with a first positioning mark.

[0060] The first positioning mark can be a circle, and the first mark coordinates are the coordinates of the center point of the first positioning mark in the mechanical coordinate system; in another embodiment, the first positioning mark is a cross-shaped structure, in which case the first mark coordinates are the coordinates of the cross intersection of the first positioning mark in the mechanical coordinate system. The first positioning mark has the same shape as the second positioning mark.

[0061] Preferably, the first preset positioning point is the midpoint of the two first positioning marks and is the center of the backlight sheet; the second preset positioning point is the midpoint of the two second positioning marks. The first positioning mark is set as the midpoint of the two first preset positioning marks, and the first preset positioning coordinates can be easily determined according to the coordinates of the two first marks. a1 , Y a1 ) and (X a2 , Y a2 ), the first preset positioning coordinate (X a3 , Y a3 ) is determined as follows:

[0062]

[0063]

[0064] Similarly, in the embodiment where the second marking coordinates are (Xb1, Yb1) and (Xb2, Yb2), the second preset positioning coordinates (Xb3, Yb3) are determined as follows:

[0065]

[0066]

[0067] The first preset positioning point is also the center point of the backlight sheet, so that when the grabbing mechanism grabs the backlight sheet, the grabbing mechanism and the midpoint of the backlight sheet are aligned up and down, thereby improving the stability when grabbing the backlight sheet.

[0068] The gripping mechanism may include a suction cup, and the rotating shaft passes through the center point of the suction cup. Therefore, when the suction cup adsorbs the backlight sheet, the center point of the suction cup coincides with the center point of the backlight sheet, thereby improving the stability when adsorbing the backlight sheet and ensuring that the backlight sheet can fit the segment code screen with high precision.

[0069] Of course, the first preset positioning point may also be the center point where a first positioning mark is located, and the second preset positioning point may be the center point where a corresponding second positioning mark is located.

[0070] Furthermore, the two first positioning marks are located at two opposite corners of the backlight sheet.

[0071] The backlight sheet as a whole is basically a rectangular structure, and the two first positioning marks are respectively located at two opposite corners of the backlight sheet, so that the distance between the two first positioning marks is relatively far. In actual applications, there is a certain error in the coordinates of the two first marks, and the distance between the two first positioning marks is relatively far, which makes the distance between the two first mark coordinates relatively far, thereby improving the accuracy of determining the backlight sheet placement angle α. Similarly, it will also improve the accuracy of determining the segment code screen placement angle β and improve the accuracy of the angle θ between the first connecting line and the second connecting line.

[0072] In addition, the first positioning mark is located at the corner of the backlight sheet, so that the second positioning mark is also basically located at the corner or edge of the segment code screen, so that in the segment code display screen formed by bonding (the segment code display screen is obtained after the backlight sheet and the segment code screen are bonded), the first and second positioning marks will not affect the display of the segment code display screen.

[0073] The grabbing mechanism is provided with a horizontal auxiliary line.

[0074] In step S1300, before the grasping mechanism grasps the backlight film, the grasping mechanism is adjusted according to the backlight film placement angle and the preset initial angle so that the auxiliary line is parallel to the first connecting line, and the grasping mechanism is moved through the first marking coordinate so that the connecting line between the center of the auxiliary line and the center of the backlight film is parallel to the height direction.

[0075] The gripping mechanism includes a suction cup, and the shape of the suction cup is close to the shape of the backlight sheet. Therefore, when the suction cup adsorbs the backlight sheet, it is preferred that the suction cup contacts the backlight sheet at a specific angle, thereby improving the stability of adsorbing the backlight sheet. For example, the backlight sheet is close to a rectangle, and the lower surface of the suction cup is also close to a rectangle. When the suction cup adsorbs the backlight sheet, the edges of the suction cup are respectively parallel to the edges of the backlight sheet, so that the suction cup can fully contact the backlight sheet, ensuring the stability when adsorbing and moving the backlight sheet.

[0076] The gripping mechanism is provided with a horizontal auxiliary line, which is a virtual line used to indicate the angle of the gripping mechanism shaft (the angle of the suction cup). When the shaft rotates, the auxiliary line also rotates with the shaft, so the angle of the gripping mechanism can be indicated according to the angle of the auxiliary line in the mechanical coordinate system. When the edge of the suction cup is parallel to the backlight film, the auxiliary line is also parallel to the first connecting line. Therefore, in step S1300, after the gripping mechanism moves to the backlight film gripping coordinate, the gripping mechanism will be rotated so that the angle between the first auxiliary line and the X-axis reaches the backlight film placement angle α. At this time, the first auxiliary line will be parallel to the first connecting line, so that the gripping mechanism (suction cup) can stably grip the backlight film, prevent the backlight film from being displaced relative to the gripping mechanism during the movement of the backlight film, and ensure that the backlight film is fitted with the segment code screen with high precision.

[0077] In another embodiment, a horizontal auxiliary line is provided on the gripping mechanism, and an angle between the auxiliary line and the X-axis of the mechanical coordinate system has a preset initial angle.

[0078] In step S1300, before the gripping mechanism grips the backlight sheet, the gripping mechanism is adjusted from the initial angle to the gripping angle; after the backlight sheet and the segment code screen are bonded, the gripping mechanism is rotated to the initial angle again;

[0079] Wherein, at the grabbing angle, the auxiliary line is parallel to the first connecting line.

[0080] The initial angle is a fixed angle, and the grabbing angle is consistent with the backlight placement angle α. Before grabbing the backlight, the grabbing mechanism rotates from the initial angle to the grabbing angle, so that the auxiliary line is parallel to the first connecting line, thereby improving the stability when grabbing and moving the backlight. After the backlight and the segment code screen are bonded, the grabbing mechanism will be rotated to the initial angle again, so that the grabbing mechanism is reset in the circumferential direction, avoiding the cumulative error in the circumferential direction caused by the periodic rotation of the grabbing mechanism, and ensuring that the grabbing mechanism can fit the backlight and the segment code screen with high precision every time.

[0081] A first limiting block and a second limiting block are provided on the placement platform. The first limiting block defines the placement position of the backlight sheet, and the second limiting block defines the placement position of the segment code screen.

[0082] When the backlight sheet is placed at the backlight sheet placement position and the segment code screen is placed at the segment code screen placement position, there is a shooting point position directly above each first positioning mark and each second positioning mark.

[0083] In step S1100, the backlight sheet is placed at the backlight sheet placement position, the segment code screen is placed at the segment code screen placement position, and the corresponding first positioning mark or second positioning mark is photographed at each shooting point.

[0084] The first limit block can limit the placement position of the backlight sheet, and can roughly position the backlight sheet, so that the position does not change much after each time the backlight sheet is placed; similarly, the second limit block can limit the placement position of the segment code screen, and after the segment code screen is placed in the segment code screen placement position, it can roughly position the segment code screen, so that the position does not change much after each time the segment code screen is placed.

[0085] Taking a segment code screen placement position and a backlight sheet placement position as an example, four shooting points are set in the workspace. After the backlight sheet is placed at the backlight sheet placement position and the segment code screen is placed at the segment code screen placement position, since the backlight sheet and the segment code screen are both roughly positioned, there is a shooting point directly above each first positioning mark and there is a shooting point directly above each second positioning mark.

[0086] In step S1100, the photographic device photographs the corresponding positioning mark directly below it at each shooting point to obtain target image information. That is to say, there is only one positioning mark in the target image information, that is, only the photographed positioning mark can be located. Therefore, in this embodiment, the photographic device needs to photograph the positioning mark directly below it at four shooting points respectively to obtain four target image information, so that the four positioning marks can be positioned on the mechanical coordinate system respectively.

[0087] In this way, each positioning mark is photographed separately to obtain corresponding target image information, which can improve the accuracy of the mark coordinates of the positioning mark on the mechanical coordinate system.

[0088] In the present invention, when the camera device photographs the positioning mark, the camera device is located at the corresponding shooting point, so that the camera device is located directly above the positioning mark, so that in the obtained target image information, the image of the positioning mark is basically located in the middle of the target image information, which improves the recognition of the image of the positioning mark. In addition, the deformation degree of the partial information located in the middle area of ​​the target image information is very small (the size of the mechanical coordinate system corresponding to the partial pixels in the middle area is consistent, and the size of the mechanical coordinate system corresponding to the partial pixels farther away from the middle area tends to become larger. The middle area is circular or rectangular, and the center point of the middle area is consistent with the center point of the image information. The area of ​​the middle area is 0.05-0.15 of the area of ​​the image information). In this way, no matter which positioning mark is photographed, in the obtained target image information, the image of the positioning mark is located in the middle area of ​​the target image information. In this way, the coordinates of the image of the positioning mark in the target image information can be obtained with high precision, thereby improving the positioning accuracy of the positioning mark in the mechanical coordinate system (how to convert the coordinates in the image information into the coordinates in the mechanical coordinate system is described below).

[0089] Of course, in another embodiment, the camera device is fixed at a specific position, and the camera device can capture all the positioning marks into the same target image information, thereby positioning each positioning mark on the mechanical coordinate system.

[0090] The mechanical coordinate system is provided with standard positioning coordinates (X1, Y1), and the image coordinate system is provided with standard pixel coordinates (x1, y1) corresponding to the standard positioning coordinates.

[0091] The X-axis of the mechanical coordinate system is parallel to the X-axis of the image coordinate system, and the positive directions of the two are consistent. The Y-axis is parallel to the Y-axis, and the positive directions of the two are consistent.

[0092] The mark coordinates (X2, Y2) of the positioning mark in the mechanical coordinate system are determined according to the target pixel coordinates (x2, y2) and the comparison relationship; the comparison relationship satisfies:

[0093] X2=X1+(x2-x1)*k;

[0094] Y2=Y1+(y2-y1)*k;

[0095] Wherein, k is the proportional relationship between the image coordinate system and the mechanical coordinate system.

[0096] Taking the determination of the first mark coordinates of a first positioning mark on the backlight sheet in the mechanical coordinate system as an example, the camera device photographs the first positioning mark at the shooting point directly above the first positioning mark to obtain the target image information. Each shooting point corresponds to an image coordinate system, that is, all the target image information photographed at the shooting point share the same image coordinate system, and the coordinates of the image of the first positioning mark in the image coordinate system (the aforementioned target pixel coordinates) are determined. Taking the first positioning mark as a circle as an example, the coordinates of the pixel point where the center of the circle of the image of the positioning mark is located in the image coordinate system are determined as the target pixel coordinates. In addition, the target image information is formed by a matrix arrangement of pixels, and the horizontal arrangement direction of the pixels is parallel to the x-axis, and the vertical arrangement direction is parallel to the y-axis. Each pixel of the matrix is ​​a square monochrome block, so the component of the target pixel coordinate on the x-axis is the number of pixel columns (integer) in the target image information, and the component on the y-axis is the number of pixel rows (integer) in the target image information, so as to determine the specific pixel position.

[0097] The image coordinate system has standard pixel coordinates, and the mechanical coordinate system has standard positioning coordinates. The standard pixel coordinates correspond to the standard positioning coordinates. Therefore, the connection between the image coordinate system and the mechanical coordinate system can be established, so that any pixel coordinates in the image coordinate system can be converted into mechanical coordinates.

[0098] Specifically, by measuring the proportional relationship k between the image coordinate system and the mechanical coordinate system, k is the length of a single pixel on the corresponding mechanical coordinate system. For example, k = 0.01 means that the side length of a single pixel on the X-axis or Y-axis of the mechanical coordinate system corresponds to 0.01 mm. Therefore, the deviation of the marking coordinates relative to the standard positioning coordinates can be obtained by multiplying the deviation between the target pixel coordinates and the standard pixel coordinates on the x-axis and y-axis by k, thereby obtaining the standard positioning coordinates.

[0099] Since there is a shooting point directly above each positioning mark, the corresponding image coordinate system will change due to the change of the shooting point. Therefore, for each shooting point, there is a corresponding standard positioning coordinate, a standard pixel coordinate and an image coordinate system, as well as a proportional relationship k between the image coordinate system and the mechanical coordinate system, so that each positioning mark can be accurately positioned on the mechanical coordinate system.

[0100] The standard positioning coordinates and the corresponding standard pixel coordinates may be determined by using a position determination method, including the steps of:

[0101] S100, placing a standard component (backlight sheet or segment code screen) at a corresponding placement position; collecting image information of a corresponding positioning mark at a shooting point, and determining the standard pixel coordinates (x1, y1) of the positioning mark in the image information.

[0102] S200, move the grasping mechanism so that it is located directly above the photographed positioning mark, and determine the standard positioning coordinates (X1, Y1) of the grasping mechanism in the mechanical coordinate system.

[0103] The standard positioning coordinates and the standard pixel coordinates both point to the same positioning mark, thereby establishing a connection between the image coordinate system and the mechanical coordinate system, so that any pixel point on the image coordinate system can be converted into the mechanical coordinate.

[0104] In step S200, a positioning rod may be installed on the grasping mechanism, and the axis of the positioning rod is colinear with the rotating shaft, so it is only necessary to ensure that the lower end of the positioning rod is located directly above the positioning mark. At this time, the coordinates of the grasping mechanism are the standard positioning coordinates.

[0105] It should be noted that when determining the standard pixel coordinates, they are also determined by photographing the positioning marks. When the backlight film and the segment code screen are placed on the placement platform, the backlight film and the segment code screen are roughly positioned. That is to say, in the image coordinate system, the standard pixel coordinates and the target pixel coordinates are both in the middle area. In the mechanical coordinate system, the mark coordinates and the standard positioning coordinates are close (the deviations on the X-axis and Y-axis are both within 4 mm). The present application amplifies such a small deviation to the pixel level, and determines the deviation value between the target pixel coordinates and the standard pixel coordinates by the number of pixels, thereby determining the mark coordinates, improving the positioning accuracy of the positioning mark in the mechanical coordinate system, and facilitating the subsequent high-precision and low-profile bonding of the backlight film and the segment code screen.

[0106] The method for determining the proportional relationship k between the image coordinate system and the mechanical coordinate system is:

[0107] S10. Place a ruler on the placement platform, wherein the length direction of the ruler is parallel to the x-axis or y-axis of the image coordinate system, and at least a portion of the ruler is located directly below the shooting point; and use a camera to shoot the ruler directly below the ruler at the shooting point to obtain ruler image information.

[0108] S20, obtaining the number of pixels A occupied by the preset ruler length B in the ruler image information, and obtaining k=B / A.

[0109] The ruler has a mark of preset length, for example, a length mark of 10 mm. The ruler is placed on a placement platform and is located directly below the shooting point. The camera 3 shoots the ruler at the shooting point to obtain ruler image information, and then identifies the number of pixels occupied by the 10 mm length mark in the ruler image information. For example, if it occupies 1000 pixels, it can be obtained that 1000 pixels in the image information correspond to a length of 10 mm, so k is 0.01.

[0110] In this way, shooting is performed at each shooting point respectively, and according to steps S100, S200, S10, and S20 respectively, the standard positioning coordinates, standard pixel coordinates, image coordinate system and proportional relationship k corresponding to each shooting point are obtained, so that the positioning marks on the subsequent backlight sheet and segment code screen placed on the placement platform can be accurately positioned.

[0111] The present invention also provides a bonding device for the segment code screen and the backlight film, which uses the above bonding method to bond the backlight film to the segment code screen. The bonding device has a working space, and the working space is provided with a three-axis moving mechanism, a grasping mechanism, a camera device and a placing platform.

[0112] The placement platform is arranged at the lower part of the working space, and a placement position for the segment code screen and a placement position for the backlight sheet are arranged on the placement platform.

[0113] The grabbing mechanism is installed on the three-axis moving mechanism so as to be driven to move in the working space through the three-axis moving mechanism. The grabbing mechanism can rotate around the vertical direction.

[0114] The photographing device is arranged in the space and is used for photographing each of the first positioning mark and the second positioning mark.

[0115] In the present invention, the backlight sheet and the segment code screen are photographed respectively by a photographic device, and the first preset positioning coordinates (backlight sheet position) are determined according to the two first mark coordinates, the second preset positioning coordinates (segment code screen position) are determined according to the two second mark coordinates, and the angle between the two is determined according to the first connecting line and the second connecting line. In this way, the grasping mechanism can grasp the backlight sheet with high precision, and move the backlight sheet to the top of the segment code screen with high precision, and can also adjust the rotation angle of the backlight sheet, so that the backlight sheet and the segment code screen can be fitted with high precision; the present invention can improve the yield rate of the fitting of the backlight sheet and the segment code screen, and realize automatic fitting, improve the fitting efficiency, and avoid damage to the operator's eyes caused by strong light.

[0116] Furthermore, there is one camera device installed on a three-axis moving mechanism, so that the camera device can move to each shooting point to shoot the corresponding positioning mark, so as to locate the given positioning mark on the mechanical coordinate system.

[0117] It should be noted that the use of step numbers (letters or numbers) to refer to certain specific method steps in the present invention is only for the purpose of convenience and brevity of description, and is by no means intended to limit the order of these method steps by letters or numbers. Those skilled in the art will understand that the order of the relevant method steps should be determined by the technology itself and should not be inappropriately limited by the existence of step numbers. Those skilled in the art can determine various permissible and reasonable step orders based on the technology itself.

[0118] Those skilled in the art will appreciate that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0119] It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. A method for bonding a segment code screen to a backlight sheet, characterized in that: The backlight sheet is provided with two first positioning marks and a first preset positioning point; the segment code screen is provided with two second positioning marks corresponding to the two first positioning marks, and a second preset positioning point corresponding to the first preset positioning point; The bonding method comprises the steps of: S1100, placing the backlight sheet and the segment code screen on a placement platform, photographing the first positioning mark and the second positioning mark respectively, and determining the first mark coordinates of the two first positioning marks in a mechanical coordinate system and the second mark coordinates of the two second positioning marks in the mechanical coordinate system according to the photographed target image information; S1200, determining a first preset positioning coordinate of the first preset positioning point in the mechanical coordinate system according to the two first mark coordinates, determining a second preset positioning coordinate of the second preset positioning point in the mechanical coordinate system according to the two second mark coordinates, and determining a rotation angle between a first connecting line of the two first mark coordinates and a second connecting line of the two second mark coordinates; S1300, according to the first preset positioning coordinates, the second preset positioning coordinates and the rotation angle, the grasping mechanism grasps and drives the backlight sheet to move and rotate to above the segment code screen, so that the first preset positioning point is aligned with the second preset positioning point, the first connecting line is parallel to the second connecting line, and then the backlight sheet is moved downward until it is in contact with the segment code screen, so that the two first positioning marks and the two second positioning marks are overlapped with each other; Wherein, a horizontal auxiliary line is provided on the gripping mechanism, and the angle between the auxiliary line and the X-axis of the mechanical coordinate system has a preset initial angle; In step S1300, before the grasping mechanism grasps the backlight film, the grasping mechanism is adjusted according to the backlight film placement angle and the preset initial angle so that the auxiliary line is parallel to the first connecting line, and the grasping mechanism is moved through the first marking coordinate so that the connecting line between the center of the auxiliary line and the center of the backlight film is parallel to the height direction.

2. The laminating method according to claim 1, characterized in that: The first preset positioning point is the midpoint of the two first positioning marks and is the center of the backlight sheet; the second preset positioning point is the midpoint of the two second positioning marks.

3. The laminating method according to claim 1, characterized in that: The two first positioning marks are located at two opposite corners of the backlight sheet.

4. The laminating method according to claim 1, characterized in that: In step S1300, before the grabbing mechanism grabs the backlight sheet, the grabbing mechanism is adjusted from the initial angle to the grabbing angle; after the backlight sheet and the segment screen are attached, the grabbing mechanism is rotated to the initial angle again; Wherein, when the grasping mechanism is adjusted to the grasping angle, the auxiliary line is parallel to the first connecting line.

5. The laminating method according to claim 1, characterized in that: The placement platform is provided with a first limit block and a second limit block, the first limit block defines the placement position of the backlight sheet, and the second limit block defines the placement position of the segment code screen; When the backlight sheet is placed at the backlight sheet placement position and the segment code screen is placed at the segment code screen placement position, there is a shooting point directly above each of the first positioning marks and each of the second positioning marks; In step S1100, the backlight sheet is placed at the backlight sheet placement position, the segment code screen is placed at the segment code screen placement position, and the corresponding first positioning mark or the second positioning mark is photographed at each of the photographing points.

6. The laminating method according to any one of claims 1 to 5, characterized in that: In step S1100, the positioning mark is photographed by a camera to obtain target image information; the target pixel coordinates of the positioning mark in the image coordinate system are identified, and the mark coordinates of the positioning mark in the mechanical coordinate system are determined based on a preset comparison relationship between the image coordinate system and the mechanical coordinate system.

7. The laminating method according to claim 6, characterized in that: The mechanical coordinate system is provided with standard positioning coordinates (X1, Y1), and the image coordinate system is provided with standard pixel coordinates (x1, y1) corresponding to the standard positioning coordinates; The X-axis of the mechanical coordinate system is parallel to the X-axis of the image coordinate system, and the positive directions of the two are consistent; the Y-axis is parallel to the Y-axis, and the positive directions of the two are consistent; The mark coordinates (X2, Y2) of the positioning mark in the mechanical coordinate system are determined according to the target pixel coordinates (x2, y2) and the comparison relationship; the comparison relationship satisfies: X2=X1+(x2-x1)*k; Y2=Y1+(y2-y1)*k; Wherein, k is the proportional relationship between the image coordinate system and the mechanical coordinate system.

8. A device for bonding a segment code screen to a backlight sheet, characterized in that: The backlight sheet is bonded to the segment screen using the bonding method described in any one of claims 1 to 7, wherein the bonding device has a working space, and a three-axis moving mechanism, a gripping mechanism, a camera device and a placing platform are arranged in the working space; The placement platform is arranged at the lower part of the workspace, and a placement position for the segment code screen and a placement position for the backlight sheet are arranged on the placement platform; The grabbing mechanism is installed on the three-axis moving mechanism so as to be driven to move in the working space by the three-axis moving mechanism, and the grabbing mechanism can rotate around the vertical direction; The photographic device is arranged in the space and is used for photographing each of the first positioning mark and the second positioning mark.

9. The laminating device according to claim 8, characterized in that: The number of the photographing device is one and the photographing device is installed on the three-axis moving mechanism.

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