JP3055371B2 - Method for manufacturing flexible liquid crystal display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flexible liquid crystal display panel.

[0002]

2. Description of the Related Art A color liquid crystal having a screen size of several inches, which is a so-called simple matrix type mounted on recent laptop, notebook, and palmtop personal computer models and has hundreds to hundreds of stripe electrodes in each of vertical and horizontal directions. An outline of a partial cross-sectional view of the display panel is shown in FIG. As shown in FIG. 7, a main component of the liquid crystal display panel is usually a phase polarizer 7.
9, upper and lower two glass plates 71 and 72, a transparent electrode 75, an alignment film 76, an adhesive 78, a liquid crystal 77, an R (red) 73-1,
G (green) 73-2, B (blue) 73-3, BL (black) 73
-4.

[0003] Regarding the definition of the screen used for the display panel, the pixel size and the density are approximately 300 µm × 100 µm and 10 lines / mm, respectively. In order to manufacture a large number of display panels having such a size, the number of pixels, and a density with high yield industrially, inexpensively, and with high precision, a method of taking a plurality of display panels from a large-size substrate is implemented. Glass is used that can maintain accuracy because it is difficult to bend in each process and is easy to fix. Moreover, the large-sized glass substrate is 400 mm × 300 mm.
Degrees are being used as standard.

[0004] However, the prior art using a plastic film substrate is disclosed in Japanese Patent Application Laid-Open No. 3-192321, but there is no specific reference to a method of obtaining a plurality of large-size substrates.

[0005]

As described above, the production of the liquid crystal display panel 70 which requires a high-density pixel and is used in a recent personal computer requires the precision in the process of etching the stripe electrode 95 and the panel assembling process. High accuracy is required in the positioning accuracy of the above. In response to such demands, there has been a problem that the plastic film substrate is easily bent and hardly fixed, which is disadvantageous in the manufacturing process, so that electrode processing and assembly cannot be performed with high precision as in the case of using a glass substrate.

[0006]

According to the present invention, at least one of the two substrates uses a first substrate in which a plastic film is formed on a large-sized substrate, or is separated into solid pieces in advance. A first substrate on which a plastic film is formed is used, and a second substrate using a plastic film substrate separated into solid pieces is used for the other substrate. Up to the laminating step, a method that can maintain the same accuracy as using a glass substrate is used, and after lamination, the lamination part is cut into a plurality of pieces. It is possible to take.

[0007]

The first substrate in which the plastic film is formed on the substrate is unlikely to bend in the process similarly to the glass substrate.
In addition, since it is easy to fix, the alignment at the time of lamination with the plastic film of the second substrate can be performed with high accuracy, and after lamination, it can be cut into a plurality of pieces while maintaining the alignment accuracy.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The main subject matter of the present invention will be described below in detail with reference to the drawings and embodiments.

(Embodiment 1) FIG. 1 shows a substrate 11 of a large size.
FIG. 3 is a conceptual diagram of a striped transparent electrode 13 for taking a plurality of pieces on a translucent plastic film 12 formed thereon. As the base 11, a large-sized glass plate, metal plate, or plastic plate can be applied. The method of forming the light-transmitting plastic film 12 on the base 11 is a liquid polyimide resin, a polyethylene terephthalate resin, a polypropylene resin, a polystyrene resin after being treated in advance with a release agent.
A heat-resistant resin such as a polycarbonate resin or a polyamide resin is applied to the substrate 11 in a large size by a spinner method or a roll coater method, and then cured and dried, or after previously treated with a release agent, various heat-resistant plastic films described above. It is possible by laminating such as. A substrate manufactured by these methods is referred to as a first substrate.

FIG. 2 is a conceptual diagram of a stripe-shaped transparent electrode 23 formed on a plurality of translucent plastic films 22. The film thickness of the plastic film 22 is preferably about several tens μm to several hundred μm in view of the process in consideration of prevention of bending. The substrate manufactured by these methods is used as the second substrate 2
Set to 0. Although the number of transparent electrodes in each of the P11 region of the first substrate and the P11 region of the second substrate is several in the drawing,
This is for the purpose of facilitating the explanation and understanding, and the actual number of liquid crystal display panels is more than one hundred and ten.

FIG. 3 is a conceptual diagram in which a first substrate and a second substrate are stacked while maintaining a certain gap. The two substrates 10,
Before laminating 20, as described in the conventional example, an alignment film coating process and a rubbing process are performed on each substrate, and one of the substrates is laminated so that a constant gap is maintained between the two substrates. After performing a process of uniformly dispersing particulate beads of several μm on the substrate, the layers are laminated.
Since these steps are not intended by the present application, detailed description will be omitted. Further, in order to bond the two substrates 10 and 20 when the first substrate and the second substrate are laminated, a step of applying an adhesive in advance by a screen printing method before laminating is also necessary. It is not necessary to do so.
Also, since the first substrate 10 is a substrate with little deflection, the positioning accuracy when laminating can be performed while maintaining the accuracy of several μm each in the vertical and horizontal directions.

FIG. 3 is a conceptual diagram showing that eight pieces P11 to P42 are picked from a large format as is apparent from FIG.

Reference numeral 24 denotes an injection port for injecting liquid crystal between the two substrates 10 and 20 laminated by a vacuum injection method. These injection ports 24 can also be implemented by pre-drilling the second substrate 20 before stacking. In the present embodiment, the injection port 24 is formed in the second substrate 20 by drilling, but the injection port 24 can be formed on either side of the substrate.

After laminating in this manner, liquid crystal is injected into each of the eight regions P11 to P42 by a vacuum injection method and the injection ports are sealed, so that a plurality of liquid crystal display panels are formed on the large-sized substrate 10. Can be manufactured once in the middle of the process.

Next, the first substrate 10 side and the second substrate
Cutting is performed by aligning the cutting lines 26 on the substrate 20 side up and down so as to be spatially identical. When the substrate 11 of the first substrate 10 is glass, a scribing reference line on the glass surface is scribed,
The second substrate 20 can be manufactured by cutting after cutting with a cutter.

FIG. 4 shows one of the large-sized substrates shown in FIG. 3 which is divided into eight pieces each having a size of 5 to 6 inches. As shown in FIG. 4, it can be seen that a liquid crystal display panel formed on the substrate 11 separated into individual pieces at this time is formed.

FIG. 5 shows the liquid crystal display panel on the substrate 11 separated into individual pieces from the substrate 11 to the first substrate 10 and the second substrate 2.
It is the figure which peeled off the laminated part of No. 0. The peeling from the substrate 11 can be performed mechanically from the side surface cut into individual pieces since the substrate 11 is subjected to a mold release treatment before the light-transmitting plastic film 12 is applied. Also, by immersing in warm water of several tens of degrees Celsius, peeling can be carried out by the penetration of warm water into the interface between the substrate and the plastic film. The numbers corresponding to the respective constituent materials shown in FIGS. 4 and 5 are common to the numbers described in FIGS.

(Embodiment 2) FIG. 6 is a conceptual diagram of another invented example in which a plurality of plastic substrates 11 are formed in advance on a base 11, and then the following steps are manufactured in substantially the same steps as in Embodiment 1. is there. The first substrate 11 can be formed by a thick film printing method or a method of attaching a plastic film. In the present invention, after the first and second substrates are laminated, the liquid crystal is injected from the liquid crystal injection port, and after sealing, the flexible structure can be achieved by peeling from the base 11, and a cutting / separating step such as a cutter or a scribe is not required.

[0019]

As described in the above embodiments, the present invention is based on several inventions in which a plurality of large-size fixed panels are fixed in the production of a flexible liquid crystal display panel.
It has the following advantages. (1) A conventional process using a glass substrate can be adopted in order to carry out a state in which a flexible plastic substrate is laminated on a substrate having a firm shape and a small amount of deflection, and a high-definition and high-density panel can be manufactured. (2) Therefore, it can be mass-produced inexpensively and with good yield by solidifying a large number of pieces. (3) The line can be shared by placing it in the process corresponding to the glass substrate, and in the liquid crystal industry where the elements of the equipment industry are strong,
This is a major advantage in capital investment. (4) Since the color filters can be externally and accurately laminated after laminating the first and second substrates, the yield is improved, and there is a merit in low cost of colorization. (5) The thickness of the plastic film substrate can be selected over a wide range, and the design of the model is easier than the glass substrate type in terms of the display panel size, pixel density, and viewing angle from the two aspects of the selection of the liquid crystal cell thickness. And spread.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a plastic film substrate on a substrate.

FIG. 2 is a conceptual diagram of a plastic film substrate.

FIG. 3 is a conceptual diagram of a laminated plastic film substrate on a substrate.

FIG. 4 is a conceptual diagram of a laminated plastic film substrate on a substrate separated into solid pieces.

FIG. 5 is a conceptual diagram of a flexible liquid crystal display panel separated into solid pieces.

FIG. 6 is a conceptual diagram of a laminated plastic film substrate on a substrate.

FIG. 7 is a partial cross-sectional view of a conventional color liquid crystal display panel.

[Explanation of symbols]

 Reference Signs List 10 first substrate 11 base 12 plastic film of first substrate 13, 23 transparent electrode 20 second substrate 22 plastic film of second substrate 24 liquid crystal injection port 26 cutting line 30 laminated substrate of first and second substrates 40 solid Laminated substrate separated into pieces 50 Flexible laminated substrate peeled into solid pieces

Claims (2)

(57) [Claims] A first transparent electrode for display which can be formed on a plurality of transparent plastic films formed on a substrate;
A liquid crystal is injected from a liquid crystal injection port after laminating a plurality of substrates and a second substrate having a display electrode on a plastic film such that the transparent electrode sides of the first and second substrates are opposed to each other while maintaining a constant gap. and first from the substrate after sealing, the second peeling the laminated portion of the substrate, sealing the layered portion of the peeled display panel or from the liquid crystal injection port is cut into a plurality pieces of the display panel by injecting a liquid crystal and cut into the display panel on a plurality pieces of substrates after, first, flexible liquid crystal display panel, characterized in that the laminated portion of the second substrate is peeled off from the substrate of the display panel on the substrate which is separated into individual pieces Manufacturing method. 2. A liquid crystal display device comprising: a first substrate and a second substrate made of a light-transmitting plastic having a display transparent electrode on a substrate; first from the sealing after the base of the plurality pieces by injecting method of manufacturing a flexible liquid crystal display panel, characterized in that by peeling the laminated portion of the second substrate to manufacture a display panel.