System for manufacturing display unit

Patent metadata

Field	Value
Publication number	US-10427357-B2
Application number	US-201716319145-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Dec 23, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A system for manufacturing a display unit including: a transport unit which transports an optical film comprising a polarizing film, an adhesive layer, and a release film, by a predetermined transport length and stops the transport of the optical film; a cutting unit which cuts the optical film in a width direction at a predetermined cutting position without cutting the release film; a separating unit which separates the release film from the polarizing film at the cutting position; and an attaching unit which attaches the polarizing film, from which the release film is separated, to a panel. The transport unit includes a horizontal roll satisfying the following conditional expression:

I*n<H<I *( n+ 1)
in which I is the predetermined transport length, n is an integer equal to or greater than 0, and H is a horizontal distance between a rotation center of the horizontal roll and the cutting position.

First claim

The invention claimed is:

1. A system for manufacturing a display unit, the system comprising:
a transport unit which repeatedly transports an optical film comprising, laminated in this order, a polarizing film, an adhesive layer, and a release film separably attached to the adhesive layer, by a predetermined transport length and repeatedly stops the transport of the optical film;
a cutting unit which cuts the optical film in a width direction at a predetermined cutting position without cutting the release film to form a slit line in the optical film;
a separating unit which separates the release film from the polarizing film at the slit line to form a sheet piece of the polarizing film; and
an attaching unit which attaches the sheet piece, from which the release film is separated, to a panel,
wherein the transport unit includes a horizontal roll which is disposed at a downstream side in a transport direction so as to be spaced apart from the cutting position,
wherein the horizontal roll transports the optical film in a horizontal direction, and the horizontal roll satisfies Conditional Expression 1 so that the slit line is not positioned on the horizontal roll when the transport of the optical film is stopped:
I*n<H<I *( n+ 1)  Conditional Expression 1:

wherein I is the predetermined transport length, which is a sum of a length of the sheet piece and an interval at which successive sheet pieces are spaced apart from each other by the slit line, n is an integer equal to or greater than 0, and H is a horizontal distance between a rotation center of the horizontal roll and the cutting position.

2. The system of claim 1 , wherein the horizontal roll satisfies Conditional Expression 2:
I *( n+ 0.3)≤ H≤I *( n+ 1)  Conditional Expression 2:

wherein I, n and H are as previously defined.

3. A system for manufacturing a display unit, the system comprising:
a transport unit which repeatedly transports an optical film comprising, laminated in this order, a polarizing film, an adhesive layer, and a release film separably attached to the adhesive layer, by a predetermined transport length and repeatedly stops the transport of the optical film;
a cutting unit which cuts the optical film in a width direction at a predetermined cutting position without cutting the release film so as to form a slit line in the optical film;
a separating unit which separates the polarizing film from the release film at the slit line to form a sheet piece of the polarizing film; and
an attaching unit which attaches the sheet piece polarizing film, which is separated from the release film, to a panel,
wherein the transport unit includes a transport direction changing roll which is disposed at a downstream side in a transport direction so as to be spaced apart from the cutting position,
wherein the transport direction changing roll and changes the transport direction of the optical film, and satisfies Conditional Expressions 3 and 4 so that the slit line is not positioned on the transport direction changing roll when the transport of the optical film is stopped:
L 1≥ I*m   Conditional Expressions 3:

L 2< I *( m+ 1)  Conditional Expressions 4:

wherein I is the predetermined transport length, which is a sum of a length of the sheet piece and an interval at which successive sheet pieces are spaced apart from each other by the slit line, m is an integer equal to or greater than 0, L 1 is a length of the optical film from a position where the slit line is formed in the optical film to an initial point of contact between the optical film and the transport direction changing roll, and L 2 is a length of the optical film from the position where the slit line is formed in the optical film to a final point of contact between the optical film and the transport direction changing roll.

4. The system of claim 2 , wherein the transport direction changing roll satisfies Conditional Expressions 5 and 6:
L 1≥ I *( m+ 0.3)  Conditional Expression 5:

L 2< I *( m+ 0.7)  Conditional Expression 6:

wherein I, m, L 1 and L 2 are as previously defined.

5. A system for manufacturing a display unit, the system comprising:
a transport unit which repeatedly transports an optical film comprising, laminated in this order, a polarizing film, an adhesive layer, and a release film separably attached to the adhesive layer, by a predetermined transport length and repeatedly stops the transport of the optical film;
a cutting unit which cuts the optical film in a width direction at a predetermined cutting position without cutting the release film so as to form a slit line in the optical film;
a separating unit which separates the polarizing film from the release film at the slit line to form a sheet piece of the polarizing film; and
an attaching unit which attaches the sheet piece, which is separated from the release film, to a panel,
wherein the transport unit includes a transport direction changing roll which is disposed at a downstream side in a transport direction so as to be spaced apart from the cutting position and changes the transport direction of the optical film to a vertical direction, and a vertical roll which is in contact with and supports the optical film after while being in the transport direction is changed to the vertical direction, and
wherein the vertical roll satisfies Conditional Expression 7 so that the slit line is not positioned on the vertical roll when the transport of the optical film is stopped:
I*q−L 2< V<I *( q+ 1)− L 2  Conditional Expression 7:

wherein I is the predetermined transport length, which is a sum of a length of the sheet piece and an interval at which successive sheet pieces are spaced apart from each other by the slit line, q is an integer equal to or greater than 0, L 2 is a length of the optical film from a position where the slit line is formed in the optical film to a final point of contact between the optical film and the transport direction changing roll, and V is a vertical distance between a rotation center of the vertical roll and the final point of contact between the optical film and the transport direction changing roll.

6. The system of claim 5 , wherein the vertical roll satisfies Conditional Expression 8:
I *( q+ 0.3)− L 2≤ V≤I *( q+ 0.7)− L 2  Conditional Expression 8:

wherein I, q, L 2 and V are as previously defined.

7. The system of claim 5 , wherein the transport direction changing roll vertically changes the transport direction of the optical film to a first direction, and the vertical roll changes the transport direction of the optical film being transported in the first direction to a second direction opposite to the first direction, and
wherein the vertical roll satisfies Conditional Expressions 9 and 10:
L 3> I*r   Conditional Expressions 9:

L 4< I *( r+ 1)  Conditional Expressions 10:

wherein I is the predetermined transport length, r is an integer equal to or greater than 0, L 3 is a length of the optical film from the position where the slit line is formed in the optical film to an initial point of contact between the optical film and the vertical roll, and L 4 is a length of the optical film from the position where the slit line is formed in the optical film to a final point of contact between the optical film and the vertical roll.

8. The system of claim 7 , wherein the vertical roll Conditional Expressions 11 and 12 satisfies the following conditional expressions:
L 3≥ I *( r+ 0.3)  Conditional Expressions 11:

L 4≤ I *( r+ 0.7)  Conditional Expressions 12:

wherein I, r, L 3 and L 4 are as previously defined.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Beom Seok
• Lee Suk Jae
• Park San
• Choi Hang Suk
• Jang Eung Jin
• Jeung Bong Su
• Ryoo Jea Han

Classifications

• B65H2511/22

  Distance · CPC title

• B65H2511/11

  Length · CPC title

• B65H2301/51536

  Laser · CPC title

• B65H2301/5152

  Cutting partially, e.g. perforating · CPC title

• B65H2301/5162

  Coating, applying liquid or layer of any material to material · CPC title