JPH01136119A - Filler scattering method for liquid crystal display panel - Google Patents

Abstract

PURPOSE:To prevent the generation of deterioration of a picture quality by printing a liquid to other area than an area corresponding to a thin film transistor part with respect to one of opposed electrode substrates, and thereafter, scattering a filler onto the substrate and allowing the printing liquid to adsorb it and blowing away the filler which has not been adsorbed to the printing liquid by wind pressure. CONSTITUTION:A proper quantity of liquid 1' is put onto the tip part of a printing needle 8 provided on a printing board 9, and thereafter, the liquid 1' is printed by suitable pressure to a thin film transistor array substrate 3 which has been positioned and placed in advance. Thereafter, a filler is scattered all over the thin film transistor array substrate. The filler being in a position of a printing liquid is adsorbed to the printing liquid, and thereafter, by flowing away an unnecessary filler by applying suitable wind pressure, the filler can be dispersed and placed in a position where the liquid has been printed in advance. In such a way, a scattering position of the filler can be set simply and effectively, therefore, it does not occur that the filler exists in a thin film transistor part and a wiring part, and deterioration of the picture quality is not generated.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a filler dispersion method for liquid crystal display panels.

Naka) Conventional technology Conventionally, AI controls the distance between the substrates in which the liquid crystal is sealed!
As a method of dispersing spacing control materials (fillers) such as zQs powder, glass beads, glass fibers, etc., there is a method of dispersing the filler using wind pressure and dispersing it on the substrate (Japanese Patent Laid-Open No. 60-1
55421), or a method in which the filler is dispersed in a volatile solution such as alcohol and sprayed. Figure 5 (2) and ■ are plan views of liquid crystal panels sprayed with fillers using these conventional filler spraying methods and their
-Y line sectional view, in which 12) is a filler, (
3) is a thin film transistor array substrate, (4) is a counter electrode substrate, (5) is a thin film transistor, and (6) is a counter electrode.

e→ Interference point to be solved by the invention In such a conventional filler dispersing method, the filler dispersing position cannot be controlled, so the filler 12) may be located in the thin film transistor part (5) or the wiring part fill. There is a tendency that exists in small groups, and when the thin film transistor array substrate (3) and the counter electrode substrate (4) are combined,
If the thin film transistor part (5) or wiring part (Ill) is destroyed, or if the alignment of the liquid crystal material (71) is disturbed,
Image quality was deteriorating.

(b) Means for determining the problem The filler dispersion method for a liquid crystal display panel of the present invention is performed by dispersing filler on either a thin film transistor array substrate having a display IrrL pole and a thin film transistor array on the surface thereof or a counter electrode substrate having a transparent counter electrode. , after selectively printing a liquid in an area other than the area corresponding to the thin film transistor portion, a filler is sprinkled on the substrate to be adsorbed to the printing liquid, and then,
This process consists of blowing away the filler that was not absorbed by the printing liquid due to wind pressure.

(e) Function According to the present invention, the liquid printed on the thin film transistor array substrate or the counter electrode substrate attracts only the fillers located on the printing liquid among the fillers coated on the substrate. Then, when wind pressure is applied to such a substrate, the filler adsorbed by the printing liquid is not blown away but remains in a predetermined position.

(f) Example 1 Figures 1 and 2 are plan views and X-X of a liquid crystal display panel in which filler was sprayed using the filler spraying method of the present invention.
FIGS. 2 to 4 are line sectional views showing steps of the method of the present invention. FIG. 2 is a liquid printing process diagram, FIG. 5 is a liquid printing state diagram, and FIG. 4 is a filler dispersion state diagram. In these figures, (1) is a printing liquid made of liquid crystal material, etc., and (2) is AI! The filler is 2Qs powder, glass beads, glass fiber, etc., and in this example, the diameter is 6 μm.
A glass fiber cut into a length of approximately 20 μm is used. t31 has a thin film transistor section (5
), a wiring part u1, a display segment electrode (a thin film transistor array substrate having a thin film transistor array consisting of an ID, (4) a counter electrode substrate having a transparent counter electrode (6), (5) a gate electrode (G, drain electrode 0 , the source electrode ■, and these electrodes (G, ([8, (S) ) Thin film transistor part composed of film A4, (7) is a liquid crystal material, (8) is a printing needle that prints liquid uf on the thin film transistor array substrate r31 or counter electrode substrate (4), and its tip has a diameter of approximately 10 mm.
It is μm. (9) has a printing needle (8) of approximately 600 μm.
A plurality of printing plates are arranged at a pitch of m, and +tti is a wiring section consisting of a gate electrode line (10a) and a source electrode line (10b).

One method of the present invention will be specifically described below.

In Figure 2, the printing plate (9) and the printing needle (8) equipped with K
After applying an appropriate amount of liquid txf to the tip of the thin film transistor array substrate f31, which is positioned and installed in advance.
Print the liquid +xf with a pressure equal to K m. As a result, the liquid nf is printed as shown in FIG.

After that, filler 21 is sprinkled on the surface of the thin film transistor array substrate. Then, the filler (2) at the position of the printing liquid (1) absorbs the printing liquid (1)), and then applies an appropriate wind pressure to blow away unnecessary filler (2).

Accordingly, as shown in FIG. 5, the filler (2) can be distributed and arranged at the positions where the liquid (1:) has been printed in advance.

Furthermore, if the liquid crystal (7) injected between the thin film transistor array substrate (3) and the counter electrode substrate (4) is used as the printing liquid (II), it is possible to prevent liquids of different compositions from being mixed into the liquid crystal (7). This makes it possible to prevent deterioration of the liquid crystal (7).

Further, in this embodiment, the filler (2) is distributed at a rate of one filler for every two pixels, but one filler (2) may be distributed for every pixel or every five or more pixels.

(G) Effects of the Invention The filler dispersion method for a liquid crystal display panel of the present invention allows the filler dispersion position to be set easily and effectively, so there is no filler in the thin film transistor section or wiring section, and the image quality is improved. No deterioration occurs.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an embodiment of the filler dispersion method for a liquid crystal display panel of the present invention, and FIGS. Fig. 2 is a diagram of the liquid printing process, Fig. 3 is a diagram of the liquid printing state, and Fig. 4 is a diagram of the filler dispersion state. FIG. 2 is a plan view and a cross-sectional view taken along the Y-Y line of a liquid crystal display panel in which fillers are sprayed using the filler spraying method of FIG. (1)...printing liquid, +1)...liquid, (2)
...Filler, (3)...Thin film transistor array substrate, (4)...Counter electrode substrate, (End...Thin film transistor section, (6)...Counter electrode, (7)...
liquid crystal

Claims (2)

[Claims] (1) Either a thin film transistor array substrate having a display segment electrode and a thin film transistor array on the surface or a counter electrode substrate having a transparent counter electrode,
After selectively printing the liquid in an area other than the area corresponding to the thin film transistor portion, the filler is sprinkled on the substrate to be adsorbed to the printing liquid, and then the filler that is not adsorbed to the printing liquid is sucked away by wind pressure. Features a filler dispersion method for liquid crystal display panels. (2) A filler dispersion method for a liquid crystal display panel according to claim 1, wherein the liquid is a liquid crystal substance.