KR101774019B1 - Bonding Device having a Lens refracting the Align mark - Google Patents

Abstract

The present invention relates to a bonding apparatus having a video refracting lens and a bonding method using the apparatus, and it is an object of the present invention to provide a bonding apparatus having a video refracting lens and a bonding method using the same, And more particularly, to a bonding apparatus and a bonding method for improving alignment and bonding efficiency.
More specifically, according to the present invention, there is provided a liquid crystal display comprising: a stage portion for seating an LCD glass including a first alignment mark; A bonding unit for aligning the bonding material including the second alignment mark and bonding the bonding material to a predetermined portion of the LCD glass; A camera unit for photographing and recognizing the first alignment mark and the second alignment mark; And a control unit for calculating an offset amount between the first alignment mark and the second alignment mark photographed by the camera unit and moving the bonding unit horizontally or vertically, And forming an image refraction lens for adjusting the horizontal distance difference between the image of the alignment mark and the image of the second alignment mark.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bonding device having an image refracting lens,

The present invention relates to a bonding apparatus having a video refracting lens and a bonding method using the apparatus, and it is an object of the present invention to provide a bonding apparatus having a video refracting lens and a bonding method using the same, And more particularly, to a bonding apparatus and a bonding method for improving alignment and bonding efficiency.

BACKGROUND ART [0002] Recently, in a bonding apparatus and the like, a system that requires a high-tech increase in an optical system provided in a bonding apparatus is continuously increasing. However, due to the characteristics of the bonding products and the process characteristics, the resolution of the optical system has not been increased according to the system environment.

According to the related art, an alignment mark image is obtained with a predetermined horizontal distance difference to avoid collision between an alignment mark of a bonding material and an alignment mark of an LCD glass.

However, since the space occupied by the LCD glass is relatively large, the area occupied by the bonding material in the actual camera is small, which often causes the bonding material to deviate from the camera field of view, leading to a recognition error or recognition failure of the alignment mark .

In order to avoid such disadvantages, a high-resolution camera has been required to widen the field of view of the camera. However, the field of view of the camera has been inefficiently operated and the area for image processing has been enlarged. .

Accordingly, there is a demand for a bonding apparatus having an optical system that easily adjusts the difference in horizontal distance between two alignment marks to improve the recognition accuracy of alignment marks even if a camera having a low resolution is used.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the related art described above, and it is an object of the present invention to provide a bonding apparatus for providing an image refraction lens in a camera of a bonding apparatus to secure an optimal alignment mark image by adjusting a horizontal distance difference between alignment mark images It has its purpose.

Another object of the present invention is to provide a bonding apparatus for preventing alignment error of an alignment mark by adjusting the horizontal distance of an alignment mark image due to the image refracting lens and inducing alignment and bonding of a precise bonding material .

The technical objects to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical subjects which are not mentioned can be clearly understood by those skilled in the art from the description of the present invention .

According to an aspect of the present invention, there is provided a liquid crystal display comprising: a stage for seating an LCD glass including a first alignment mark; A bonding unit for aligning the bonding material including the second alignment mark and bonding the bonding material to a predetermined portion of the LCD glass; A camera unit for photographing and recognizing the first alignment mark and the second alignment mark; And a control unit for calculating an offset amount between the first alignment mark and the second alignment mark photographed by the camera unit and moving the bonding unit horizontally or vertically, And forming an image refraction lens for adjusting the horizontal distance difference between the image of the alignment mark and the image of the second alignment mark.

In the present invention, the image refraction lens moves the image of the first alignment mark and the image of the second alignment mark to the central region of the camera lens.

In the present invention, the image refraction lens is formed at two ends of the upper portion of the camera lens, and is spaced apart from at least two lenses having a predetermined angle difference from a horizontal plane of the camera lens.

In the present invention, the predetermined angle is 0 ° to 80 °.

In the present invention, the image refraction lens has a thickness of 1 mm to 30 mm.

In the present invention, the refractive index of the image refracting lens is 1.3 to 2.0.

In the present invention, the bonding material is a COG (Chip on Glass) material or a TAB (Tape Automated Bonding) material.

According to another aspect of the present invention, there is provided an image processing method comprising the steps of: calculating a horizontal distance between a first alignment mark and a second alignment mark in a camera unit; Adjusting an angle of the image refraction lens by a control unit; The camera section photographing the first alignment mark and the second alignment mark; Calculating an offset amount between the first alignment mark and the second alignment mark in a control unit; Moving the bonding unit horizontally and vertically by an instruction of the control unit; And pressing a bonding material having an LCD glass having the first alignment mark and a second alignment mark.

The angle of the image refracting lens according to the present invention is characterized in that a difference in angle with a horizontal plane of the lens of the camera unit increases in proportion to a horizontal distance difference between the first alignment mark image and the second alignment mark image.

The present invention further includes the step of inserting an image refracting lens having a thickness proportional to a horizontal distance difference between the first alignment mark image and the second alignment mark image onto the upper portion of the camera lens after the horizontal distance calculating step As shown in FIG.

The present invention further includes a step of inserting an image refracting lens having a refractive index proportional to a horizontal distance difference between the first alignment mark image and the second alignment mark image onto the upper portion of the camera lens after the horizontal distance calculating step As shown in FIG.

The bonding apparatus according to the present invention has the effect of securing an optimum alignment mark image by adjusting the horizontal distance difference of the alignment mark image.

Further, by the bonding device according to the present invention, it is possible to prevent the recognition error of the alignment mark and to perform the precise bonding process by adjusting the horizontal distance difference of the alignment mark image due to the image refraction lens.

Further, according to the present invention, even if a low-resolution camera and a high-resolution lens are used, a high recognition rate of an alignment mark can be ensured, thereby reducing system manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a configuration diagram of a bonding apparatus according to the related art;
1B is an illustration of an alignment mark image by a bonding apparatus according to the related art.
FIG. 2A is a configuration diagram of a bonding apparatus having a video refracting lens according to an embodiment of the present invention; FIG.
FIG. 2B is an enlarged view of a video refracting lens according to an embodiment of the present invention; FIG.
FIG. 2C is an exemplary view of an alignment mark image by a bonding apparatus having an image refracting lens according to an embodiment of the present invention; FIG.
FIGS. 3A and 3B are views illustrating an angle difference of an image refracting lens according to a horizontal distance difference between alignment marks according to an embodiment of the present invention; FIG.
4A to 4C are step-by-step illustrations of a bonding method according to an embodiment of the present invention.
5 is a flowchart of a bonding method according to an embodiment of the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1A is a configuration diagram of a conventional bonding apparatus, and FIG. 1B is an exemplary view of an alignment mark image by a bonding apparatus according to the related art.

The first alignment mark 202 of the LCD glass 201 on the stage 200 on which the camera unit 100 is located and the alignment mark 202 of the bonding material 301 attached to the bonding unit 300 The second alignment mark 302 is simply photographed from the bottom and image-processed to perform alignment and bonding processes.

However, as shown in FIG. 1B, due to the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302, each alignment mark image may deviate from the field of view of the camera unit 100 Or the alignment mark image is located at the end of the field of view of the camera unit 100, the alignment mark recognition failure problem may occur.

That is, as the horizontal distance between the two alignment marks is increased due to the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302, the field of view of the camera unit must be widened, Therefore, the alignment mark image must be obtained using a high-resolution camera, which raises the manufacturing cost of the entire system.

In order to solve such a problem, the present invention provides an image refraction lens 500 at the upper end of the camera unit 100 and adjusts an angle, a refractive index, or a thickness of the image refraction lens 500, The image of the first alignment mark 302 and the image of the second alignment mark 302 are moved to the center region of the camera unit 100 to secure an optimal alignment mark image.

2A is a configuration diagram of a bonding apparatus having an image refraction lens according to an embodiment of the present invention.

According to the bonding apparatus of the present invention, a stage part 200 for seating an LCD glass 201 including a first alignment mark 202, a bonding material 301 including a second alignment mark 302, A bonding unit 300 for aligning the first alignment mark and the second alignment mark and bonding the first alignment mark and the second alignment mark to a predetermined portion of the LCD glass, a camera unit 100 for photographing and recognizing the first alignment mark and the second alignment mark, And a control unit (not shown) for horizontally or vertically moving the bonding unit by calculating an offset amount between the mark and the second alignment mark, The image refraction lens 500 for adjusting the horizontal distance difference 400 between the images of the first alignment mark 302 and the second alignment mark 302 is formed.

The bonding unit 300 can move along the x-axis, the y-axis, and the z-axis in response to a command from the controller. The bonding unit 300 presses the aligned bonding material 301 and presses the LCD glass 201 on the stage unit 200, . ≪ / RTI >

The bonding material 301 may be a COG (Chip on Glass) material or a TAB (Tape Automated Bonding) material. However, any material that can be used in the bonding process according to the invention may be used.

The camera unit 100 may be located at a position where the first alignment mark 202 and the second alignment mark 302 can be simultaneously photographed and the image refraction lens 500 is provided at both ends of the lens. can do.

That is, the image refracting lens 500 moves the image of the first alignment mark 202 and the image of the second alignment mark 302 to the central region of the camera lens, At least two lenses having a predetermined angle difference from the horizontal plane of the lens of the camera unit.

The predetermined angle of the image refracting lens 500 can be adjusted within a range of 0 to 80 degrees with respect to the horizontal surface of the lens of the camera unit 100. [

Even if the camera unit 100 includes the lens 101 having a high magnification, the horizontal refraction lens 400 can be used regardless of the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302 , It is possible to easily obtain an optimum alignment mark image by reducing the distance difference between the two alignment marks.

In the present invention, the difference in horizontal distance between two alignment marks can be adjusted by using the difference in thickness between the camera lens 101 and the image refraction lens 500 and the difference in thickness or refractive index of the image refraction lens 500. The thickness of the image refracting lens 500 is preferably 1 mm to 30 mm, and the refractive index of the image refracting lens may be within a range of 1.3 to 2.0.

It is possible to detachably attach the image refracting lens 500 having a different thickness or refractive index to the supporter 501 provided on the upper portion of the lens 101 to replace the image refracting lenses 500 having different thicknesses or refractive indices will be.

When the photographed image of the first alignment mark 202 and the second alignment mark 302 adjusted to be captured by the center lens of the camera lens is secured by the image refraction lens 500, the controller (not shown) The bonding unit 300 moves the bonding unit 300 horizontally and vertically to perform a bonding process.

FIG. 2B is an enlarged view of an image refracting lens according to an embodiment of the present invention, and FIG. 2C is an illustration of an alignment mark image by a bonding apparatus having an image refracting lens according to an embodiment of the present invention.

The image refraction lens 500 of the present invention refracts the incident light entering from the upper part and emits the refracted light to the central area of the camera part 100. [

2C, the images of the first alignment mark 202 and the second alignment mark 302 are focused on the center of the lens as shown in FIG. 2C. The difference in the horizontal distance between the alignment marks is reduced to minimize the possibility of misrecognition of the alignment mark. Therefore, it is possible to perform a precise bonding process even if a low-cost camera is used without using a high-resolution camera .

FIGS. 3A and 3B are views illustrating an angle difference of an image refracting lens according to a horizontal distance difference between alignment marks according to an exemplary embodiment of the present invention.

According to the related art, there is a limitation that the camera unit 100 should be formed of a high-resolution camera in order to improve the recognition accuracy of the alignment mark. That is, in order to avoid a collision between the first alignment mark 202 and the second alignment mark 302, the camera is photographed with a predetermined horizontal distance between the alignment marks. When the horizontal distance difference between the two alignment marks becomes large, Is frequently caused to deviate from the camera field of view, leading to recognition errors of recognition marks or failure of recognition.

Since the image refraction lens 500 is provided to freely adjust the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302, Even if the horizontal distance difference 400 between the second alignment marks 302 increases, recognition errors of the alignment marks can be prevented. (Ii) Even if the camera unit 100 is formed using a camera of low resolution, Can be prevented.

In the present invention, an alignment mark recognition error due to the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302 can be corrected by the angle, thickness, or refractive index of the image refraction lens 500 .

3A, when the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302 is relatively small, It is possible to secure the camera view of the alignment mark using the image refraction lens 500 having the alignment mark.

3B, when the horizontal distance difference 400 between the first alignment mark 202 and the second alignment mark 302 is relatively large, the angle difference between the horizontal position of the lens 101 and the horizontal position of the lens 101 It is possible to secure the camera view of the alignment mark using the image refraction lens 500 having the alignment mark.

In particular, in order to increase the refractive index of incident light, i) a video refracting lens having a relatively high refractive index may be used, or ii) a video refracting lens having a relatively large thickness may be used. If the difference in horizontal distance between the two alignment marks is relatively small, a low refractive index or a low refractive index imaging lens may be used.

The angle of the image refracting lens 500 can be easily adjusted by using a known technique such as a rotation motor (not shown) attached to the support 501. The angle of the image refracting lens 500 can be easily adjusted by attaching a thickness or a refractive index You will be able to replace other image refracting lenses.

In the present invention, the thickness of the image refraction lens 500 can be freely selected within a range of 1 mm to 30 mm, and the refractive index of the image refraction lens can be freely adopted within a range of 1.3 to 2.0.

4A to 4C are step-by-step illustrations of a bonding method according to an embodiment of the present invention.

As shown in FIG. 4A, the camera section including the image refracting lens 500 simultaneously photographs the first alignment mark 202 and the second alignment mark 302. When the alignment mark is photographed using the image refraction lens 500, the alignment mark image is moved to the central region of the lens, thereby minimizing the recognition error.

When the alignment mark photographed image is obtained, the control unit calculates an offset amount between the first alignment mark 202 and the second alignment mark 302, and issues a movement command to the bonding unit 300.

As shown in FIG. 4B, the bonding unit 300 receiving the move command of the control unit horizontally moves the first alignment mark 202 and the second alignment mark 302 vertically.

As shown in FIG. 4C, the bonding unit 300 vertically moves the first alignment mark 202 and the second alignment mark 302 horizontally, presses the bonding unit 300, (301) and the LCD glass (201).

5 is a flowchart of a bonding method according to an embodiment of the present invention.

First, in step S501, a horizontal distance between the first alignment mark and the second alignment mark is calculated in the camera unit. That is, after the first alignment mark and the second alignment mark are photographed by the camera section, the horizontal distance between the alignment marks is calculated, and information about the horizontal distance difference is stored in the control section. Based on the information, The process of moving to the region can be performed.

According to the present invention, after the horizontal distance calculation step, an image refracting lens having a thickness or a refractive index proportional to a horizontal distance difference between a first alignment mark image and a second alignment mark image is inserted into an upper portion of a camera lens (S502).

That is, as the horizontal distance difference between the first alignment mark image and the second alignment mark image becomes larger, an image refracting lens having a relatively thick lens or a refracting lens having its own high refracting index is inserted into both ends of the upper part of the lens, The horizontal distance between the first alignment mark image and the second alignment mark image can be easily adjusted.

Thereafter, the angle of the image refracting lens is adjusted by the controller (S503). As the horizontal distance difference between the first alignment mark image and the second alignment mark image increases, the angle difference between the horizontal plane of the lens and the image refraction lens increases.

Using the image refraction lens having a predetermined angle, the first alignment mark image and the second alignment mark image are refracted by the refraction of the incident light and moved to the center area of the lens of the camera lens, thereby significantly increasing the recognition rate of the alignment mark.

(S504) of photographing the first alignment mark and the second alignment mark, and calculating an offset amount between the first alignment mark and the second alignment mark in the control unit S505).

When the moving distance of the bonding unit is determined by the control unit, the bonding unit moves horizontally and vertically according to the command of the control unit to vertically align / horizontally align the first alignment mark and the second alignment mark (S506) .

Thereafter, the step of pressing the bonding material having the first alignment mark and the LCD glass having the second alignment mark (S507), the bonding method according to the present invention is completed. Of course, the crack inspection step and the like may be added according to the necessity of the invention.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

100:
101: Lens
200: stage unit
201: LCD Glass
202: 1st alignment mark
300:
301: Bonding material
302: second alignment mark
400: Horizontal distance difference between alignment marks
500: image refraction lens
501: Support
502: angle between the horizontal plane of the lens and the image refraction lens

Claims (11)

A stage portion for seating an LCD glass including a first alignment mark;
A bonding unit for aligning the bonding material including the second alignment mark and bonding the bonding material to a predetermined portion of the LCD glass;
A camera unit for photographing and recognizing the first alignment mark and the second alignment mark; And
A control unit for calculating an offset amount between the first alignment mark and the second alignment mark taken by the camera unit and moving the bonding unit horizontally or vertically; And
Wherein the image of the first alignment mark and the image of the second alignment mark are moved to the center area of the lens of the camera unit so that an image of the first alignment mark and an image of the second alignment mark An image refraction lens for adjusting the horizontal distance difference,
Wherein the image refraction lens is formed of two or more lenses spaced apart from each other with a predetermined angle difference from the horizontal plane of the camera lens at both ends of the lens of the camera unit, . delete delete The method according to claim 1,
Wherein the predetermined angle difference is between 0 DEG and 80 DEG. The method according to claim 1,
Wherein the image refraction lens has a thickness of 1 mm to 30 mm.
The method according to claim 1,
Wherein the image refraction lens has a refractive index of 1.3 to 2.0. The method according to claim 1,
Wherein the bonding material is a COG (Chip on Glass) material or a TAB (Tape Automated Bonding) material. A bonding method using the bonding apparatus according to any one of claims 1 and 4 to 7,
Calculating a horizontal distance between the first alignment mark and the second alignment mark in the camera unit;
Adjusting the angle of the image refraction lens by the controller;
Photographing the first alignment mark and the second alignment mark;
Calculating an offset amount between the first alignment mark and the second alignment mark in the control unit;
Moving the bonding unit horizontally and vertically by an instruction of the control unit; And
Squeezing a bonding material having an LCD glass having the first alignment mark and a second alignment mark;
≪ / RTI > 9. The method of claim 8,
Wherein the angle of the image refracting lens is larger than the horizontal angle of the lens of the camera lens in proportion to a difference in horizontal distance between the first alignment mark image and the second alignment mark image.
9. The method of claim 8,
Further comprising inserting an image refracting lens having a thickness proportional to a horizontal distance difference between the first alignment mark image and the second alignment mark image onto the lens of the camera section after the horizontal distance calculating step Bonding method. 9. The method of claim 8,
Further comprising inserting an image refracting lens having a refractive index proportional to a horizontal distance difference between the first alignment mark image and the second alignment mark image onto the lens of the camera section after the horizontal distance calculating step Bonding method.

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