Rubbing roll orientation processor for liquid crystal display manufacturing
View Patent ↗An orientation processor (i.e., rubbing roller) for manufacturing a high quality liquid crystal display apparatus by subjecting orientation films formed on glass substrates of a relatively large-size liquid crystal display apparatus to a uniform orientation process. An orientation processor (i.e., rubbing roller) 10 is formed by applying a plurality of rubbing cloth pieces 12 A and 12 B applied with double-side bond tape to the outer periphery of the rotational roller 11 . Another orientation processor (i.e., rubbing roller) 20 is formed by at least one parallel quadrilateral rubbing cloth piece 22 B and 22 C and substantially triangular rubbing cloth pieces 22 A and 22 D disposed on the opposite sides of the cloth pieces 22 B and 22 C. The orientation processor 10 or 20 is used to execute an orientation process of rubbing orientation films formed on the surface of glass substrates (panels) and a liquid crystal display apparatus.
1. An orientation processor for executing an orientation process of causing orientation of liquid crystal by rubbing an orientation film formed on one surface of a glass substrate with rubbing cloth mounted on the outer periphery of a rotational roller, wherein:
the rubbing cloth is constituted by a plurality of substantially rectangular rubbing cloth pieces each having a width substantially corresponding to one of a plurality of divisions of the length of the rotational roller and a length substantially equal to the circumference of the rotational roller, the plurality of rubbing cloth pieces being mounted on the outer periphery of the rotational roller so as to be substantially parallel to the axial direction of the rotational roller.
2. The orientation processor according to claim 1 , wherein the plurality of rubbing cloth pieces secured to the rotational roller form setups, at which adjacent ends of rubbing cloth pieces are in contact with each other.
3. An orientation processor for executing an orientation process of causing orientation of liquid crystal by rubbing an orientation film formed on a glass substrate with rubbing cloth mounted on the outer periphery of a rotational roller, wherein:
the rubbing cloth is constituted by at least one central parallel quadrilateral rubbing cloth piece and a pair of substantially triangular rubbing cloth pieces disposed on opposite asides of the parallel quadrilateral rubbing cloth piece, the rubbing cloth pieces being mounted on the outer periphery of the rotational roller along the axial direction thereof.
4. The orientation processor according to claim 3 , wherein the plurality of rubbing cloth pieces are mounted on the outer periphery of the rotational roller with adjacent ends of them connected to each other.
5. The orientation processor according to claim 3 , wherein the plurality of rubbing cloth pieces mounted on the outer periphery of the rotational roller are substantially rectangular in the developed view.
6. The orientation processor according to claim 3 , wherein the seams between adjacent rubbing cloth pieces are fixed at all oppositions in the axial direction of the rotational roller.
7. The orientation processor according to claim 2 , wherein:
the glass substrate includes a plurality of panels having orientation films formed thereon; and
the at least one seam between adjacent rubbing cloth pieces is oriented to rub an the orientation film between adjacent panels of the glass substrate.
8. The orientation processor according to claim 7 , wherein:
liquid crystal is poured into a gap formed between opposed orientation films of paired panels having been subjected to the orientation process with the orientation processor.
9. The orientation processor according to claim 3 , wherein;
each circumference of the rotational roller has at most one seam.
10. The orientation processor according to claim 3 , wherein:
the rubbing cloth has width A;
the outer periphery of the rotational roller has circumference B;
a lower end of one of the central parallel quadrilateral rubbing cloth pieces has length C;
a left side length of the one of the central parallel quadrilateral rubbing cloth pieces has length D;
a width of a material cloth from which the one of the central parallel quadrilateral rubbing cloth pieces is cut is denoted by E;
a number of seams in the rubbing cloth is denoted by F; and
an angle between the left side and the lower end of the one of the central parallel quadrilateral rubbing cloth pieces is denoted by θ.
11. The orientation processor according to claim 10 , wherein:
A/(E/2) is calculated and the decimally rounded-off number is F;
A/F is C;
tan −1 (B/C) is θ; and
C/sin θ is D.
12. The orientation processor according to claim 11 , wherein:
√((D 2 −D*sin θ) 2 )) is C.
13. The orientation processor according to claim 3 , wherein a number of seams between adjacent portions of the at least one central parallel quadrilateral rubbing cloth piece in any circumference of the rotation roller is at most two.