Screen and cover plate glass alignment method, device and mechanism

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Through the single-group camera visual positioning method, the predetermined target coordinates of the screen and cover glass are identified, the offset is calculated, and the position of the cover glass is adjusted, which solves the problem of low patch accuracy in the prior art and achieves higher patch accuracy.

CN119520661APending Publication Date: 2025-02-25GUANGDONG LEIMINGYANG INTELLIGENT EQUIPMENT CO LTD

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Patent Information

Application Number: CN202411642194.5
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-11-18
Publication Date: 2025-02-25

AI Technical Summary

Technical Problem

The prior art uses dual camera visual positioning method when the screen and cover glass are pasted, resulting in complex machine adjustment process and difficult to establish mapping relationships, which in turn affects the accuracy of the pasting.

Method used

A single-group camera visual positioning method is adopted to control the camera to take pictures of the screen and cover glass, identify the predetermined target coordinates, calculate the offset, and adjust the position of the cover glass to align with the screen.

Benefits of technology

The machine adjustment process is simplified, the mapping steps between the cameras are eliminated, and the accuracy of alignment between the screen and the cover glass is improved.

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Abstract

The invention provides a screen and cover plate glass alignment method. The method comprises the following steps: controlling a single group of cameras to photograph a screen to obtain a first image; identifying a first predetermined target of a screen in the first image and obtaining coordinates of the first predetermined target; controlling a moving mechanism to move so as to move the cover plate glass into a shooting range of the single group of cameras; controlling the single-group camera to photograph the cover plate glass to obtain a second image, and using an exposure light source to irradiate the cover plate glass during photographing; identifying a second predetermined target, corresponding to the first predetermined target, of the cover plate glass in the second image, and obtaining coordinates of the second predetermined target; obtaining the offset of the cover plate glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target; and controlling the moving mechanism to move the cover plate glass according to the offset so as to align the cover plate glass with the screen. According to the invention, a single-group camera is adopted for visual positioning, the debugging process can be simplified, and the alignment precision can be improved.

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Description

Technical Field

[0001] The present invention relates to the technical field of screen and cover glass bonding, and in particular to a screen and cover glass alignment method, device and mechanism. Background Art

[0002] The screen assembly of an electronic device is made by pasting the screen and the cover glass together. The cover glass protects the screen. After the screen and the cover glass are pasted together, they are installed on the main body of the electronic device. The screen and the cover glass need to be aligned when pasting them together. Physical positioning methods are not sufficient to meet the alignment requirements. Therefore, most of the existing technologies use camera photography for positioning.

[0003] CN204628183U discloses an electronic product screen bonding device, which uses two cameras. The two cameras shoot two components respectively, and then identify the position difference of the two components to adjust the position. A mapping relationship needs to be made between the two cameras before taking pictures and aligning them. It is necessary to find the corresponding relationship between the two groups of different cameras to make a preliminary framework for the subsequent visual compensation. This will make the entire process complicated, and the mapping relationship between the two cameras will increase the position accuracy error between the two components, which will lead to low bonding accuracy. Summary of the invention

[0004] Therefore, it is necessary for the present invention to provide a method for aligning a screen and a cover glass using a single set of cameras for visual positioning. Using a single set of cameras for visual positioning can simplify the machine adjustment process, eliminate the step of mapping between cameras, and improve the accuracy of the alignment of the screen and the cover glass.

[0005] The present invention provides a method for aligning a screen and a cover glass using a single camera group visual positioning, wherein the single camera group includes one or more cameras, and the method includes:

[0006] Controlling a single camera group to take a picture of the screen to obtain a first image;

[0007] Identify a first predetermined target of the screen in the first image and obtain the coordinates of the first predetermined target;

[0008] Controlling the moving mechanism to move the cover glass into the shooting range of the single group camera;

[0009] Controlling the single camera group to take a picture of the cover glass to obtain a second image, and using an exposure light source to illuminate the cover glass during the picture taking;

[0010] Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain the coordinates of the second predetermined target;

[0011] Obtaining an offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target;

[0012] The moving mechanism is controlled according to the offset to move the cover glass to align with the screen.

[0013] Furthermore, the cover glass includes a middle transparent portion and a black outer frame portion surrounding the middle transparent portion, and the second predetermined target includes an edge line of the black outer frame portion of the cover glass in the second image.

[0014] Furthermore, the edge line is an outer edge line or an inner edge line.

[0015] Furthermore, the edge line is a straight edge line or a rounded edge line.

[0016] Furthermore, a light-transmitting hole for a front camera is provided on the cover glass, and the second predetermined target includes an edge line of the light-transmitting hole of the screen in the first image.

[0017] Further, the single camera group includes a plurality of cameras;

[0018] Each of the cameras captures a different position of the screen to obtain a plurality of the first images, each of the first images having a plurality of first predetermined targets at different positions;

[0019] Each camera photographs a different position of the cover glass to obtain a plurality of second images, and each of the second images has a plurality of second predetermined targets at different positions.

[0020] Furthermore, the controlling the moving mechanism to move the cover glass into the shooting range of the single camera group includes:

[0021] The moving mechanism is controlled to move so as to move a portion of the cover glass corresponding to the second predetermined target into the shooting range of the single group camera and to space the cover glass from the screen at a predetermined distance.

[0022] The present invention provides a screen and cover glass alignment device using a single camera group visual positioning, the single camera group includes one or more cameras, and the device includes:

[0023] A first control unit, used to control a single camera group to take a picture of the screen to obtain a first image;

[0024] A first recognition unit, used to recognize a first predetermined target on the screen in the first image and obtain the coordinates of the first predetermined target;

[0025] a second control unit, used for controlling the movement of the moving mechanism to move the cover glass into the shooting range of the single group of cameras;

[0026] a third control unit, configured to control the single camera group to take a picture of the cover glass to obtain a second image, and to use an exposure light source to illuminate the cover glass when taking the picture;

[0027] a second recognition unit, configured to recognize a second predetermined target of the cover glass in the second image corresponding to the first predetermined target and obtain coordinates of the second predetermined target;

[0028] a calculation unit, for obtaining an offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target;

[0029] A fourth control unit is used to control the moving mechanism to move the cover glass to align with the screen according to the offset.

[0030] The invention provides a screen and cover glass alignment mechanism, and an alignment method of the alignment mechanism.

[0031] The method of the present invention includes controlling a single camera group to take a picture of a screen to obtain a first image; identifying a first predetermined target of the screen in the first image and obtaining the coordinates of the first predetermined target; controlling a moving mechanism to move to move the cover glass into the shooting range of the single camera group; controlling the single camera group to take a picture of the cover glass to obtain a second image, and using an exposure light source to illuminate the cover glass during the picture taking; identifying a second predetermined target of the cover glass in the second image corresponding to the first predetermined target and obtaining the coordinates of the second predetermined target; obtaining the offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target; and controlling the moving mechanism to move the cover glass to align with the screen according to the offset. The present invention adopts a single camera group visual positioning, which can simplify the machine adjustment process, eliminate the step of mapping between cameras, and improve the accuracy of the alignment of the screen and the cover glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] A specific embodiment of the present invention provides a method for aligning a screen and a cover glass using visual positioning of a single set of cameras. The method can be applied to an alignment mechanism for a screen and a cover glass.

[0035] The mechanism may include a first positioning mechanism, a second positioning mechanism and a moving mechanism, wherein the first positioning mechanism is used to physically initially position the screen, the second positioning mechanism is used to physically initially position the cover glass, and the moving mechanism is used to move the cover glass positioned on the second positioning mechanism.

[0036] The single group camera includes one or more cameras, that is, one camera is the single group camera, or multiple cameras are the single group camera. The position of the single group camera is fixed, and it is located at the position corresponding to the first positioning mechanism, and the single group camera can directly take a picture of the screen. In specific settings, the first positioning mechanism can be located below the single group camera.

[0037] Specifically, the screen and cover glass alignment method using a single set of cameras for visual positioning of the present invention specifically includes the following steps:

[0038] S11: controlling a single camera group to take a picture of the screen to obtain a first image.

[0039] When the single camera group includes a plurality of cameras, each camera may be allowed to capture a different position of the screen to obtain a plurality of first images.

[0040] S12: Identify a first predetermined target on the screen in the first image and obtain the coordinates of the first predetermined target.

[0041] When the single camera group includes a plurality of cameras, each of the first images has a plurality of first predetermined targets at different positions.

[0042] The first predetermined target is a pre-selected structure on the screen, which may be a rounded edge line of the screen, a straight edge line of the screen, or an edge line of a circular hole on the screen.

[0043] S13: Control the moving mechanism to move the cover glass into the shooting range of the single group camera.

[0044] Specifically, the moving mechanism can be controlled to move the portion of the cover glass corresponding to the second predetermined target into the shooting range of the single-group camera and to keep the cover glass and the screen at a predetermined distance, thereby minimizing the calculation error caused by the different distances between the cover glass and the screen and the single-group camera.

[0045] S14: controlling the single camera group to take a picture of the cover glass to obtain a second image, and using an exposure light source to illuminate the cover glass during the picture taking.

[0046] When the single camera group includes a plurality of cameras, each camera captures a different position of the cover glass to obtain a plurality of the second images.

[0047] It is particularly important to explain that, since the present invention uses a single group camera to successively position the screen and the cover glass, when the cover glass is positioned, it is necessary to move the cover glass into the shooting range of the single group camera, that is, the cover glass is between the screen and the single group camera. Since the cover glass has a transparent part, if the cover glass is not illuminated by an exposure light source, the second image captured includes not only the cover glass, but also the screen. Since the outline of the cover glass is basically the same as the outline of the screen, it will result in the inability to distinguish between the second predetermined target and the first predetermined target in subsequent steps.

[0048] Therefore, in the process of photographing the cover glass to obtain the second image, the present invention uses an exposure light source to irradiate the cover glass, so that the cover glass is exposed, and the obtained second image is an overexposed image, in which only the cover glass is displayed and the screen is no longer displayed.

[0049] S15: Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain the coordinates of the second predetermined target.

[0050] When the single camera group includes a plurality of cameras, each of the second images has a plurality of second predetermined targets at different positions.

[0051] Preferably, the cover glass includes a middle transparent part and a black outer frame part surrounding the middle transparent part, and the second predetermined target includes an edge line of the black outer frame part of the cover glass in the second image, and the edge line is an outer edge line or an inner edge line, and the edge line is a straight edge line or a rounded edge line.

[0052] Preferably, a light-transmitting hole for a front camera is provided on the cover glass, and the second predetermined target may include an edge line of the light-transmitting hole of the screen in the first image.

[0053] Even if the cover glass is irradiated with an exposure light source so that the second image is overexposed, since the cover glass includes a black outer frame portion, the black outer frame portion of the cover glass in the second image still has reliable clarity, making it easy to obtain the coordinates of the second predetermined target.

[0054] When the exposure light source is used to illuminate the cover glass, the exposure light source can be directly irradiated on the front side of the cover glass to reflect light to the single-group camera through the cover glass. Alternatively, the exposure light source can be transmitted through the cover glass from the back side to enter the single-group camera. The black outer frame of the cover glass blocks part of the light, so that the black outer frame of the cover glass appears very clearly in the second image.

[0055] S16: Obtaining an offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target.

[0056] The offset is the offset of the parallel relative position of the cover glass with respect to the screen, excluding the (longitudinal) distance between the cover glass and the screen.

[0057] S17: Controlling the moving mechanism to move the cover glass to align with the screen according to the offset.

[0058] The present invention adopts a single set of cameras for visual positioning, which can simplify the machine adjustment process, eliminate the step of mapping between cameras, and improve the accuracy of alignment between the screen and the cover glass.

[0059] After the cover glass and the screen are aligned, the moving mechanism is moved longitudinally relative to the screen to complete pre-bonding of the cover glass and the screen, and then the pre-bonded cover glass and the screen are sent to a vacuum bonding mechanism for negative pressure bonding to complete the final bonding process.

[0060] The specific embodiment of the present invention further provides a screen and cover glass alignment device using a single camera group visual positioning, the single camera group includes one or more cameras, and the device includes:

[0061] A first control unit, used to control a single camera group to take a picture of the screen to obtain a first image;

[0062] A first recognition unit, used to recognize a first predetermined target on the screen in the first image and obtain the coordinates of the first predetermined target;

[0063] a second control unit, used for controlling the movement of the moving mechanism to move the cover glass into the shooting range of the single group of cameras;

[0064] a third control unit, configured to control the single camera group to take a picture of the cover glass to obtain a second image, and to use an exposure light source to illuminate the cover glass when taking the picture;

[0065] a second recognition unit, configured to recognize a second predetermined target of the cover glass in the second image corresponding to the first predetermined target and obtain coordinates of the second predetermined target;

[0066] a calculation unit, for obtaining an offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target;

[0067] A fourth control unit is used to control the moving mechanism to move the cover glass to align with the screen according to the offset.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for aligning a screen and a cover glass using a single camera group visual positioning, wherein the single camera group includes one or more cameras, characterized in that: The method comprises: Controlling a single camera group to take a picture of the screen to obtain a first image; Identify a first predetermined target of the screen in the first image and obtain the coordinates of the first predetermined target; Controlling the moving mechanism to move the cover glass into the shooting range of the single group camera; Controlling the single camera group to take a picture of the cover glass to obtain a second image, and using an exposure light source to illuminate the cover glass during the picture taking; Identify a second predetermined target of the cover glass in the second image that corresponds to the first predetermined target and obtain the coordinates of the second predetermined target; Obtaining an offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target; The moving mechanism is controlled according to the offset to move the cover glass to align with the screen.

2. The method for aligning a screen and a cover glass using a single set of cameras for visual positioning according to claim 1, characterized in that: The cover glass includes a middle transparent portion and a black outer frame portion surrounding the middle transparent portion, and the second predetermined target includes an edge line of the black outer frame portion of the cover glass in the second image.

3. The method for aligning a screen and a cover glass using a single set of cameras for visual positioning according to claim 2, characterized in that: The edge line is an outer edge line or an inner edge line.

4. The method for aligning a screen and a cover glass using a single set of cameras for visual positioning according to claim 2 or 3, characterized in that: The edge line is a straight edge line or a rounded edge line.

5. The method for aligning a screen and a cover glass using a single set of cameras for visual positioning according to claim 1, characterized in that: The cover glass is provided with a light-transmitting hole for a front camera, and the second predetermined target includes an edge line of the light-transmitting hole of the screen in the first image.

6. The method for aligning a screen and a cover glass using a single set of cameras for visual positioning according to claim 1, characterized in that: The single camera group includes a plurality of cameras; Each of the cameras captures a different position of the screen to obtain a plurality of the first images, each of the first images having a plurality of first predetermined targets at different positions; Each camera photographs a different position of the cover glass to obtain a plurality of second images, and each of the second images has a plurality of second predetermined targets at different positions.

7. The method for aligning a screen and a cover glass using a single set of cameras for visual positioning according to claim 1, characterized in that: The controlling the moving mechanism to move the cover glass into the shooting range of the single-group camera includes: The moving mechanism is controlled to move so as to move a portion of the cover glass corresponding to the second predetermined target into the shooting range of the single group camera and to space the cover glass from the screen at a predetermined distance.

8. A screen and cover glass alignment device using a single camera group visual positioning, the single camera group includes one or more cameras, characterized in that: The device comprises: A first control unit, used to control a single camera group to take a picture of the screen to obtain a first image; A first recognition unit, used to recognize a first predetermined target on the screen in the first image and obtain the coordinates of the first predetermined target; a second control unit, used for controlling the movement of the moving mechanism to move the cover glass into the shooting range of the single group of cameras; a third control unit, configured to control the single camera group to take a picture of the cover glass to obtain a second image, and to use an exposure light source to illuminate the cover glass when taking the picture; a second recognition unit, configured to recognize a second predetermined target of the cover glass in the second image corresponding to the first predetermined target and obtain coordinates of the second predetermined target; a calculation unit, for obtaining an offset of the cover glass according to the coordinates of the first predetermined target and the coordinates of the second predetermined target; A fourth control unit is used to control the moving mechanism to move the cover glass to align with the screen according to the offset.

9. A screen and cover glass alignment mechanism, characterized in that: The alignment mechanism adopts the alignment method as described in any one of claims 1-7.