JP3048379B2 - Liquid crystal display manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for manufacturing a liquid crystal display.

(Prior Art) A liquid crystal display operates at a low voltage, has low power consumption, and has practically advantageous characteristics such that it is easy to see under a direct light bath. For this reason, liquid crystal displays have been applied in a wide range of fields such as electronic watches, cameras, calculators, various measuring instruments, and public display devices, and are rapidly spreading.

Generally used liquid crystal displays include a segment type display and a matrix type display.

In the case of the segment type display, an electrode substrate provided with a segment electrode and an electrode substrate provided with a common electrode are opposed to each other with a predetermined space therebetween, and the peripheral portions of these two electrode substrates are sealed to form an empty cell. After assembling the container, a liquid crystal material is injected between the electrode substrates from a liquid crystal injection hole formed in advance, and the liquid crystal injection hole is sealed later.

In the case of a matrix display, a plurality of strip electrodes are provided on each of the electrode substrates, and both strip electrodes are orthogonal to each other.

In addition, as the application field of the liquid crystal display has expanded, its shape has been diversified, and flexibility has been required.

Such a flexible liquid crystal display having flexibility is manufactured by mixing a glass fiber with a sealant.

The glass fiber has the same diameter as the spacer provided between the two substrates, and the flexibility of the display is given by the flexibility of the glass fiber.

(Problems to be Solved by the Invention) As described above, in a conventional liquid crystal display using a flexible substrate, a glass fiber is mixed with a sealant, and a liquid crystal material is injected between a pair of substrates. Stopped.

By the way, as is the case with the recent trend of electronic devices becoming lighter, thinner and smaller, ultra-thin and flexible liquid crystal displays are being provided as liquid crystal displays.

Then, with the reduction in thickness, there is a problem that filling of the liquid crystal material becomes difficult.

That is, when a liquid crystal material is filled between a pair of substrates and a sealing agent is injected and fixed as in the related art, a flexible liquid crystal display has its own flexibility.
The outer periphery of the sealant often curls inward, which hinders the injection of the liquid crystal material and the sealant.

For this reason, the filling property of the liquid crystal material is lowered, and the workability is lowered, and at the same time, the quality is lowered.

Therefore, in order to improve the productivity of the flexible liquid crystal display, it is an important issue how to easily and surely inject the liquid crystal material and the sealant.

The present invention has been made in view of such a conventional circumstance, and a liquid crystal material and a sealant can be reliably and easily injected between two substrates. It is an object of the present invention to provide a method for manufacturing a flexible liquid crystal display having high reliability.

[Structure of the Invention] (Means for Solving the Problems) According to a method for manufacturing a liquid crystal display of the present invention, a step of forming an electrode on a main surface of a pair of substrates and a method of forming a main electrode of one of the substrates are performed. A step of disposing a spacer on a surface, a step of mixing a fiber having a diameter larger than the spacer with a sealant for sealing the pair of substrates, and a step of mixing the sealant obtained by mixing the fibers with the pair of substrates. Printing to form a liquid crystal material injection port on the other substrate, and disposing the sealant along the respective end faces of the pair of substrates on which the liquid crystal material injection port is formed up to the respective end faces. ,
A step of disposing the pair of substrates such that main surfaces thereof face each other via the spacer, a step of injecting a liquid crystal material between the pair of substrates from the liquid crystal injection port, and sealing the liquid crystal material injection port And sealing with an agent. In one embodiment of the present invention, the substrate is a flexible substrate.

(Operation) In the method of manufacturing a liquid crystal display of the present invention, when assembling a pair of substrates, a fiber having a diameter larger than the diameter of a spacer disposed between the substrates, for example, a glass fiber is mixed with a sealing agent. doing.

When printing the sealant on the substrate, the seal printing on the injection port side is widely printed up to the end face of the display device product.

This prevents the warpage of the sealant and facilitates the injection of the liquid crystal material and the sealant, thereby improving productivity and reliability.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

Embodiment FIG. 1 is a sectional view showing a liquid crystal display obtained according to an embodiment of the present invention.

This liquid crystal display will be described along with the manufacturing process. First,
Electrodes 3 and 4 made of, for example, ITO (indium titanium oxide) are formed in a desired pattern on one main surfaces of a pair of substrates 1 and 2 made of a film.

The substrates 1 and 2 are not limited as long as they are excellent in heat resistance and chemical resistance and can be applied to a liquid crystal display. A glass substrate such as blue plate glass, white plate glass or quartz glass can be used. However, since the flexibility of the liquid crystal display can be further improved,
Polyethylene terephthalate (PET) as substrates 1 and 2
And an organic film such as polyethersulfone (PES).

Next, a polyimide resin or the like is applied on the electrodes 3 and 4 to form the alignment films 5 and 6.

After subjecting the alignment films 5 and 6 to rubbing treatment, the substrates 1, 2
For example, the spacers 7 are scattered and arranged on the substrate 2, and the inner surface of the edge on the other substrate 1 is screen-printed or the like.
A sealant 8 made of, for example, a thermosetting epoxy resin having an empty portion serving as a liquid crystal injection port is mixed with the glass fiber 9 and printed.

The glass fiber 9 mixed with the sealing agent 8 is
It is set to a larger diameter.

 FIG. 2 shows the printing pattern of the sealant.

As shown in FIG. 2, the sealant 8 has an opening as a liquid crystal injection port 21, and the sealant on the opening side is printed widely across the end face 22 of the display device product. I have.

After that, the substrate 1 coated with the sealing agent 8 is put into a furnace,
By performing heating, defoaming and leveling of the sealant 8 are performed.

Then, the substrate 1 is cut into a rectangular unit shape shown by a dotted line in FIG.

Then, the pair of substrates 1 and 2 of each unit are superimposed on each other with the spacer 7 interposed therebetween such that one main surface side faces each other, and the substrates 1 and 2 are bonded together by heating while applying a constant pressure.

Further, the liquid crystal material 10 is injected into the gap between the substrates 1 and 2 from the liquid crystal injection port 21 according to a conventional method.

Subsequently, the liquid crystal injection port 21 is sealed with a sealing agent made of, for example, a photocurable acrylic resin that can be instantaneously cured.

Then, the other surfaces of the substrates 1 and 2 are each provided with a polarizing plate.
The liquid crystal display is obtained by arranging 11 and 12 and further attaching a reflecting plate 13 to the polarizing plate 12.

By using such a method, injection of a liquid crystal material and a sealant between a pair of substrates became very easy, and productivity was greatly improved.

Comparative Example FIG. 3 is a view showing a printing pattern of a sealant in a conventional method of manufacturing a liquid crystal display.

In the figure, a sealant 32 is applied to a substrate 31 along the inside of the end face of the device product.

The glass fiber mixed with the sealant 32 has the same diameter as the spacer.

After the application of the sealant, the substrate 31 is cut into the unit shape shown by the dotted line in the figure as in the example, and the liquid crystal material is injected from the injection port 33 as in the example, and injected with a sealing agent. The inlet 33 is sealed.

When a liquid crystal display is manufactured by this method, after the substrate 31 is cut into a unit shape, the sealant 32 is warped, and the injection port is formed.
The shape of 33 has changed.

This makes it difficult to inject the liquid crystal material and the sealant,
Insufficient filling caused a decrease in reliability and workability.

As described above, in the manufacturing method of the embodiment as compared with the conventional manufacturing method, a glass fiber having a diameter larger than that of the spacer is mixed with the sealant, and the sealant is printed widely to the end face of the device product, whereby the seal is formed. The liquid crystal material and the sealing agent were easily injected by preventing the warpage of the agent, and the productivity was improved.

[Effects of the Invention] As described above, according to the method for manufacturing a liquid crystal display of the present invention, a liquid crystal material and a sealant can be reliably and easily injected between two substrates, and A flexible liquid crystal display device having high filling properties and sufficient reliability can be obtained.

Therefore, the present invention greatly contributes to improvement in productivity and reliability of the liquid crystal display.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a liquid crystal display according to one embodiment of the present invention, FIG. 2 is a view showing a sealant application pattern of the liquid crystal display shown in FIG. 1, and FIG. FIG. 6 is a view showing a sealant application pattern in the liquid crystal display manufacturing method of FIG. 1, 2, substrate 3, 4, electrode 5, 6, alignment film 7, spacer 8, sealant 9, glass fiber 10, liquid crystal material 11, 12, Polarizer, 13 Reflector, 21 Liquid crystal inlet, 22 End face.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-289915 (JP, A) JP-A-2-126231 (JP, A) JP-A-52-29754 (JP, A) 158428 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02F 1/13 101 G02F 1/1333 500 G02F 1/1339 500 G02F 1/1341

Claims (2)

(57) [Claims] A step of forming an electrode on a main surface of a pair of substrates; a step of arranging a spacer on a main surface of one of the pair of substrates; and a step of sealing the pair of substrates. Mixing a fiber having a diameter larger than that of the spacer with a sealant, and printing the sealant mixed with the fiber on the other of the pair of substrates so as to form a liquid crystal material injection port; The pair of substrates are arranged so that the main surfaces thereof face each other via the spacers so that the sealant is arranged along the respective end surfaces of the pair of substrates on which the liquid crystal material injection port is formed to the respective end surfaces. Manufacturing a liquid crystal display, comprising: a step of injecting a liquid crystal material between the pair of substrates from the liquid crystal injection port; and a step of sealing the liquid crystal material injection port with a sealant. Method. 2. The method according to claim 1, wherein the substrate is a flexible substrate.