(19)
(11)EP 3 075 534 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
05.10.2016 Bulletin 2016/40

(21)Application number: 16151314.8

(22)Date of filing:  14.01.2016
(51)Int. Cl.: 
B32B 37/10  (2006.01)
G02F 1/13  (2006.01)
B32B 38/18  (2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30)Priority: 30.03.2015 CN 201510146179

(71)Applicant: Xiaomi Inc.
Beijing 100085 (CN)

(72)Inventors:
  • TANG, Hengjun
    100085 Beijing (CN)
  • SHI, Shasha
    100085 Beijing (CN)
  • HU, Shaoxing
    100085 Beijing (CN)

(74)Representative: Sackin, Robert 
Reddie & Grose LLP 16 Theobalds Road
London WC1X 8PL
London WC1X 8PL (GB)

  


(54)SYSTEM, METHOD AND DEVICE FOR CONTROLLING ADHESION


(57) Disclosed are a system, a method and a device for controlling adhesion, to discharge bubbles between a touch panel (10), TP and a liquid crystal display (30), LCD, and prevent relative movement therebetween during adhesion. The system for controlling adhesion includes a controlling module (11), an adhering roller (12) and a limiting device (13). The controlling module (11) is configured to determine a first moving speed of the adhering roller (12) and a second moving speed of the limiting device (13). The adhering roller (12) is configured to roll along a first direction from one side to the other side of the TP at the first moving speed. The limiting device (13) is configured to move along a second direction at the second moving speed and limit the TP to move with respect to the LCD.




Description

TECHNICAL FIELD



[0001] The present disclosure generally relates to the field of electronic product manufacturing technology, and more particularly, to a system, method and device for controlling adhesion.

BACKGROUND



[0002] Along with increasing demands to optical property of display for a smart phone, it has been more and more popular to adhere a touch panel (TP) and a liquid crystal display (LCD) by optical bonding process. In the related art, after aligning a view area (VA) of the TP to an active area (AA) of LCD, a machine for holding the LCD is maintained still, and the TP adhered with optical clear adhesive (OCA) is moved by a mechanical hand so to be above the LCD. The adhesion between the TP and the LCD is performed in a vacuumed metal cavity.

[0003] During adhering the TP to the LCD in the vacuumed metal cavity, as the TP is not fixed by a fixing device, relative movement between the TP and the LCD occurs along an X or Y direction in the vacuumed state. Besides, in order to completely discharge bubbles between the TP and the LCD, it requires a certain additional time to vacuum the metal cavity, thus resulting in low productivity.

SUMMARY



[0004] In order to overcome the problem existing in the related art, the present disclosure provides a system, method and device for controlling adhesion, so as to effectively discharge bubbles between a TP and a LCD, and thereby preventing relative movement between the TP and the LCD during adhesion.

[0005] According to a first aspect of embodiments of the present disclosure, there is provided a system for controlling adhesion. A touch panel (TP) is adhered to a liquid crystal display (LCD) with optical clear adhesive (OCA) at a predetermined adhering angle. The system for controlling adhesion includes: a controlling module, an adhering roller and a limiting device.

[0006] The controlling module is configured to determine a first moving speed of the adhering roller and a second moving speed of the limiting device.

[0007] The adhering roller is configured to roll along a first direction from one side to the other side of the TP at the first moving speed.

[0008] The limiting device is configured to move along a second direction at the second moving speed and limit the TP to move with respect to the LCD.

[0009] In an embodiment, the limiting device may include:

a limiting portion, configured to limit the TP to move with respect to the LCD; and

a supporting portion, having a supporting surface at a predetermined angle with respect to a horizontal plane, and the LCD is supported on the supporting surface,

in which the limiting device is moved along the second direction at the second moving speed, so as to enable the supporting surface and the LCD to become horizontal from the predetermined angle.



[0010] In an embodiment, the controlling module includes:

an acquiring sub-module, configured to acquire the predetermined angle with respect to the horizontal plane; and

a speed controlling sub-module, configured to control the adhering roller to move at the first moving speed and the limiting device to move at the second moving speed in accordance with a sine value of the predetermined angle.



[0011] In an embodiment, the first moving speed and the second moving speed meet a formula below:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.

[0012] In an embodiment, the system further may include an air pressure regulating valve, configured to apply force on two axial ends of the adhering roller, so as to adjust force applied by the adhering roller along a direction vertical to the TP under control of the controlling module.

[0013] According to a second aspect of embodiments of the present disclosure, there is provided a method for controlling adhesion. A touch panel (TP) is adhered to a liquid crystal display (LCD) with optical clear adhesive (OCA) at a predetermined adhering angle. The method may include:

determining a first moving speed of an adhering roller and a second moving speed of a limiting device;

controlling the adhering roller to roll along a first direction from one side to the other side of the TP at the first moving speed; and

limiting the TP to move with respect to a liquid crystal display (LCD) by a limiting device, and controlling the limiting device to move along a second direction at the second moving speed.



[0014] In an embodiment, limiting the TP to move with respect to a LCD by a limiting device, and controlling the limiting device to move along a second direction at the second moving speed may include:

limiting the TP to move with respect to the LCD by a limiting portion of the limiting device; and

controlling the limiting device to move along the second direction at the second moving speed, in which the limiting device has a supporting surface at a predetermined angle with respect to a horizontal plane and the LCD is supported on the supporting surface, so as to enable the supporting surface and the LCD to become horizontal from the predetermined angle.



[0015] In an embodiment, determining a first moving speed of an adhering roller and a second moving speed of a limiting device may include:

acquiring the predetermined angle; and

controlling the adhering roller to move at the first moving speed and the limiting device to move at the second moving speed in accordance with a sine value of the predetermined angle.



[0016] In an embodiment, the first moving speed and the second moving speed meet a formula as below:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.

[0017] In an embodiment, the method may further include:

applying force on two axial ends of the adhering roller by an air pressure regulating valve, and

adjusting force applied by the adhering roller along the direction vertical to the TP.



[0018] According to a third aspect of embodiments of the present disclosure, there is provided a device for controlling adhesion. The device may include:

a processor;

a memory for storing instructions executable by the processor; and

a controlling module, configured to determine a first moving speed of an adhering roller and a second moving speed of a limiting device.



[0019] According to embodiments of the present disclosure, the technical solution may have the following advantageous effects. The adhering roller is rolled from one side to the other side of the TP, so as to discharge bubbles between the TP and the LCD, thus increasing adhesion speed of the optical bonding process. The TP is limited by the limiting device during the entire adhesion process, thus preventing relative movement between the TP and the LCD, guaranteeing adhering accuracy, and thereby improving adhesion productivity to a great extend under limited plant and equipment investment.

[0020] It is to be understood that both the foregoing general description and the following detailed description are illustrative and explanatory only and are not restrictive of the disclosure, as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS



[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1A is a schematic diagram showing a system for controlling adhesion, according to an illustrative embodiment;

Fig. 1B is another schematic diagram showing a system for controlling adhesion, according to an illustrative embodiment;

Fig. 2A is a schematic diagram showing a system for controlling adhesion, according to an illustrative example;

Fig. 2B is another schematic diagram showing a system for controlling adhesion, according to an illustrative example;

Fig. 3 is a flow chart showing a method for controlling adhesion, according to an illustrative embodiment; and

Fig. 4 is a block diagram of a device suitable for controlling adhesion, according to an illustrative embodiment.


DETAILED DESCRIPTION



[0022] Reference will now be made in detail to illustrative embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise represented. The implementations set forth in the following description of illustrative embodiments do not represent all implementations consistent with the disclosure. Instead, they are merely examples of apparatuses and methods consistent with aspects related to the disclosure as recited in the appended claims.

[0023] Fig. 1A is a schematic diagram showing a system for controlling adhesion, according to an illustrative embodiment, and Fig. 1B is another schematic diagram showing a system for controlling adhesion, according to an illustrative embodiment. As shown in Figs. 1A and 1B, after a touch panel (TP) 10 and a liquid crystal display (LCD) 30 are aligned, the TP 10 may be moved by a mechanical hand to be above the LCD 30, and the TP 10 is adhered to the LCD 30 with optical clear adhesive (OCA) 20 at a predetermined adhering angle, thus facilitating the adhesion. The system for controlling adhesion includes: a controlling module 11, an adhering roller 12, and a limiting device 13.

[0024] The controlling module 11 is configured to determine a first moving speed of the adhering roller 12 and a second moving speed of the limiting device 13.

[0025] The adhering roller 12 is configured to roll along a first direction (indicated by an arrow direction of V1 which is parallel to the TP 10) from one side to the other side of the TP 10 at the first moving speed. In an embodiment, the controlling module 11 controls a rotation speed of a first stepping motor (not shown), so as to control the adhering roller 12 to roll at the first moving speed V1.

[0026] The limiting device 13 is configured to along a second direction (indicated by an arrow direction of V2 which is parallel to a side wall of the limiting device 13) at a second moving speed and limit the TP 10 to move with respect to the LCD 30. In an embodiment, the controlling module 11 controls a rotation speed of a second stepping motor (not shown), so as to control the limiting device 13 to move at the second moving speed V2.

[0027] In specific, Fig. 1A merely illustratively indicates that the arrow direction of V2 is of a vertical direction at the very moment shown as Fig. 1A. It would be appreciated by those skilled in the art that the arrow direction of V2 is further of an inclined direction with respect to the vertical direction at other moving moments, i.e., the arrow direction of V2 is variable, for example, the arrow direction of V2 may be of a tangential direction along an arc. In another word, the second moving direction may be a tangential direction.

[0028] In the present embodiment, the adhering roller 12 is rolled along the first direction from one side to the other side of the TP10, so as to discharge bubbles between the TP 10 and the LCD 30, and thereby improving adhesion speed of optical bonding process. The TP 10 is limited by the limiting device 13 during the entire adhesion process, thus preventing relative movement between the TP 10 and the LCD 30, guaranteeing adhering accuracy, and thereby improving adhesion productivity to a great extend under limited plant and equipment investment.

[0029] In an embodiment, the limiting device may include:

a limiting portion, configured to limit the TP to move with respect to the LCD; and

a supporting portion, having a supporting surface at a predetermined angle with respect to a horizontal plane, and the LCD being supported on the supporting surface,

in which the limiting device is moved along the second direction at the second moving speed, so as to enable the supporting surface and the LCD to become horizontal from the predetermined angle.



[0030] In an embodiment, the controlling module may include:

an acquiring sub-module, configured to acquire the predetermined angle with respect to the horizontal plane; and

a speed controlling sub-module, configured to control the adhering roller to move at the first moving speed and the limiting device to move at the second moving speed in accordance with a sine value of the predetermined angle.



[0031] In an embodiment, the first moving speed and the second moving speed meet formula as below:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.

[0032] In an embodiment, the system further includes an air pressure regulating valve, configured to apply force on two axial ends of the adhering roller, so as to adjusting force applied by the adhering roller along a direction vertical to the TP under control of the controlling module.

[0033] Reference will be made below on how to adhere the TP and the LCD in detail.

[0034] According to embodiments of the present disclosure, the above described system may discharge bubbles between the TP and the LCD, thus improving adhesion speed of optical bonding process, preventing relative movement therebetween during adhering the TP and the LCD, guaranteeing adhering accuracy, and thereby improving adhesion productivity to a great extend under limited plant and equipment investment.

[0035] The technical solution provided by embodiments of the present disclosure will be illustrated with specific examples hereinafter.

[0036] Fig. 2A is a schematic diagram showing a system for controlling adhesion, according to an illustrative example, and Fig. 2B is another schematic diagram showing a system for controlling adhesion, according to an illustrative example. The present example is based on the above described embodiments. As shown in Figs. 2A and 2B, the limiting device 13 includes:

a limiting portion 131, configured to limit the TP 10 to move with respect to the LCD 30; and

a supporting portion 132, having a supporting surface at a predetermined angle with respect to a horizontal plane (indicated as α ), and the LCD being supported on the supporting surface,

in which the limiting device 13 is moved along the second direction at the second moving speed, so as to enable the supporting surface and the LCD to become horizontal.



[0037] In an embodiment, the controlling module 11 may include:

an acquiring sub-module 111, configured to acquire the predetermined angle with respect to the horizontal plane; and

a speed controlling sub-module 112, configured to control the adhering roller to move at the first moving speed and the limiting device to move at the second moving speed in accordance with a sine value of the predetermined angle acquired by the acquiring sub-module 111.



[0038] In an embodiment, the predetermined angle, whose size is not limited by examples of the present disclosure, may be set in accordance with a material of the OCA, and thicknesses of the TP 10 and the LCD 30.

[0039] In an embodiment, the first moving speed and the second moving speed meet a formula as below:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.

[0040] The first moving speed V1 and the second moving speed V2 are adjusted to be in conformity with the above formula V2/V1= sin α, so as to ensure the entire TP 10 being evenly rolled by the adhering roller 12 when the adhering roller 12 is rolled along the first direction (the right side in Figs.), from one side to the other side of the TP 10. After the supporting surface of the supporting portion 132 gradually becomes horizontal from the predetermined angle, it may enable the TP 10 and the LCD 30 to be maintained horizontal after being adhered, and prevent the TP 10 and the LCD 30 from deformation induced by external anomaly pressure.

[0041] In an embodiment, the system for controlling adhesion may further include: an air pressure regulating valve 14, configured to apply force on two axial end of the adhering roller 12, so as to enable the entire adhering roller 12 to be evenly stressed along an axial direction of its own, and thereby adjusting force applied by the adhering roller 12 along a direction vertical to the TP under control of the controlling module 11. As shown in Fig. 2A, the force applied by the adhering roller 12 along the direction vertical to the TP 10 is of an arrow direction shown as F. The force (shown as F) applied by the adhering roller 12 onto the TP 10 may be adjusted by the air pressure regulating valve 14. In an embodiment, the air pressure regulating valve 14 may adjust the force to be capable of discharging the bubbles between the TP 10 and the LCD 30 without inducing deformation to the TP 10.

[0042] In specific, a position at which the air pressure regulating valve 14 is located is not limited by embodiments of the present disclosure, i.e., the air pressure regulating valve 14 may be arranged in the middle of the adhering roller 12 (illustratively shown in Fig. 2B), or disposed at two ends of the adhering roller 12 (not shown), as long as it may enable the adhering roller 12 to be evenly stressed along the axial direction of its own.

[0043] In an embodiment, on the basis of the advantageous technical effect of the above embodiments, it may allow the supporting surface of the supporting portion 132 to become horizontal from the predetermined angle, so as to enable the TP 10 and the LCD 30 to be maintained horizontal after being adhered, and thus preventing the TP 10 and the LCD 30 from deformation induced by external anomalous pressure. The force may be adjusted by the air pressure regulating valve 14 to be capable of discharging the bubbles between the TP 10 and the LCD 30 without inducing deformation to the TP 10.

[0044] Besides, it has been demonstrated by relevant experimental data that productivity may be increased to 180 to 200 pieces per hour by the system provided by embodiments of the present disclosure, as compared with that of 70 to 120 pieces per hour in the related art, which effectively overcomes the productivity bottle neck under limited plant and equipment investment.

[0045] Fig. 3 is a flow chart showing a method for controlling adhesion, according to an illustrative embodiment. A touch panel (TP) is adhered to a liquid crystal display (LCD) with optical clear adhesive (OCA) at a predetermined adhering angle. As shown in Fig. 3, the method for controlling adhesion includes the following steps S301-S303.

[0046] In step S301, a first moving speed of an adhering roller and a second moving speed of a limiting device are determined.

[0047] In step S302, the adhering roller is controlled to roll along a first direction from one side to the other side of the TP at the first moving speed.

[0048] In step S303, the TP is limited to move with respect to the LCD by a limiting device, and the limiting device is controlled to move along a second direction at the second moving speed.

[0049] In an embodiment, step S303 may include:

limiting the TP to move with respect to the LCD by a limiting portion of the limiting device; and

controlling the limiting device to move along the second direction at the second moving speed, in which the limiting device has a supporting surface at a predetermined angle with respect to a horizontal plane, and the LCD is supported on the supporting surface, so as to enable the supporting surface to become horizontal from the predetermined angle.



[0050] In an embodiment, determining the first moving speed of the adhering roller and the second moving speed of the limiting device may include:

acquiring the predetermined angle; and

controlling the adhering roller to move at the first moving speed and the limiting device to move at the second moving speed in accordance with a sine value of the predetermined angle.



[0051] In an embodiment, the first moving speed and the second moving speed meet a formula as below:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.

[0052] In an embodiment, the method may further include:

applying force on two axial ends of the adhering roller by an air pressure regulating valve, and

adjusting force applied by the adhering roller along the direction vertical to the TP.



[0053] Regarding procedures for the method in the above embodiments, specific modes for executing various steps has been described in detail in respect with the system for controlling adhesion in the above embodiment, which are not repeated herein.

[0054] Fig. 4 is a block diagram of a device suitable for controlling adhesion, according to an illustrative embodiment. For example, the device 400 may be provided as a server or a main control device. Referring to Fig. 4, the device 400 includes a processing component 422, which further includes one or more processor, and a memory resource represented by a memory 432, for storing an instruction executable by the processing component 422, for example, application program. The application program stored in the memory 432 may include one or more modules, each corresponding to a group of instructions. Besides, the processing component 422 is configured to execute the instruction, so as to determine the first moving speed of the adhering roller and the second moving speed of the limiting device.

[0055] The device 400 may further include a power component 424, configured to execute power management of the device 400; one wired or wireless network interface 450, configured to connect the device 400 to network; and one input/output (I/O) interface 458. The device 400 may be operated based on an operating system stored in the memory 432, such as Windows ServerTM, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

[0056] Where functional modules are referred to in apparatus embodiments for carrying out various steps of the described method(s) it will be understood that these modules may be implemented in hardware, in software, or a combination of the two. When implemented in hardware, the modules may be implemented as one or more hardware modules, such as one or more application specific integrated circuits. When implemented in software, the modules may be implemented as one or more computer programs that are executed on one or more processors.

[0057] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed here. This application is intended to cover any variations, uses, or adaptations of the disclosure following the general principles thereof and including such departures from the present disclosure as come within known or customary practice in the art.


Claims

1. A system for controlling adhesion, comprising a controlling module (11), an adhering roller (12) and a limiting device (13), wherein
the controlling module (11) is configured to determine a first moving speed of the adhering roller (12) and a second moving speed of the limiting device (13);
the adhering roller (12) is configured to roll along a first direction from one side to the other side of a touch panel, TP at the first moving speed; and
the limiting device (13) is configured to move along a second direction at the second moving speed and to limit the TP to move with respect to a liquid crystal display, LCD.
 
2. The system of claim 1, wherein the limiting device (13) comprises:

a limiting portion (131), configured to limit the TP to move with respect to the LCD; and

a supporting portion (132), having a supporting surface at a predetermined angle with respect to a horizontal plane, and the LCD being supported on the supporting surface,

wherein the limiting device (13) is moved along the second direction at the second moving speed, so as to enable the supporting surface and the LCD to become horizontal from the predetermined angle.


 
3. The system of claim 2, wherein the controlling module (11) comprises:

an acquiring sub-module (111), configured to acquire the predetermined angle; and

a speed controlling sub-module (112), configured to control the adhering roller (12) to move at the first moving speed and the limiting device (13) to move at the second moving speed in accordance with a sine value of the predetermined angle.


 
4. The system of claim 2 or claim 3, wherein the first moving speed and the second moving speed meet a formula:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.
 
5. The system of any preceding claim, further comprising:

an air pressure regulating valve (14), configured to apply force on two axial ends of the adhering roller (12), so as to adjust a force applied by the adhering roller (12) along a direction vertical to the TP under control of the controlling module.


 
6. A method for controlling adhesion, comprising:

determining a first moving speed of an adhering roller and a second moving speed of a limiting device;

controlling the adhering roller to roll along a first direction from one side to the other side of a touch panel, TP, at the first moving speed; and

limiting the TP to move with respect to a liquid crystal display, LCD, by a limiting device, and controlling the limiting device to move along a second direction at the second moving speed.


 
7. The method of claim 6, wherein limiting the TP to move with respect to the LCD by a limiting device, and controlling the limiting device to move along a second direction at the second moving speed comprises:

limiting the TP to move with respect to the LCD by a limiting portion of the limiting device; and

controlling the limiting device to move along the second direction at the second moving speed, in which the limiting device has a supporting surface at a predetermined angle with respect to a horizontal plane, and the LCD is supported on the supporting surface, so as to enable the supporting surface and the LCD to become horizontal from the predetermined angle.


 
8. The method of claim 7, wherein determining a first moving speed of an adhering roller and a second moving speed of a limiting device comprises:

acquiring the predetermined angle; and

controlling the adhering roller to move at the first moving speed and the limiting device to move at the second moving speed in accordance with a sine value of the predetermined angle.


 
9. The method of claim 7 or claim 8, wherein the first moving speed and the second moving speed meet a formula:

wherein V1 represents the first moving speed, V2 represents the second moving speed, and α represents the predetermined angle.
 
10. The method of any of claims 6 to 9, further comprising:

applying force on two axial ends of the adhering roller by an air pressure regulating valve, and

adjusting force applied by the adhering roller along a direction vertical to the TP.


 
11. A device for controlling adhesion, comprising:

a processor;

a memory for storing instructions executable by the processor; and

a controlling module, configured to determine a first moving speed of an adhering roller and a second moving speed of a limiting device.


 
12. A computer program, which when executing on a processor, performs a method according to any of claims 6 to 10.
 




Drawing