JPH0561052A - Produciton of liquid crystal display element - Google Patents

Abstract

PURPOSE:To improve a display grade and the yield of production by dry spraying spacers to a transparent electrode substrate in a negatively electrified state and impressing a positive potential to the wiring electrodes of the transparent electrode substrate. CONSTITUTION:The spacers 4 are housed in a tank 10 and are injected toward the transparent electrode substrate 2 imposed on a base 11 from a nozzle 10b by applying the pressure of gaseous nitrogen, etc., thereto from a piping 10a. A discharge electrode 12 is provided in proximity to the nozzle 10b to negatively electrify the spacers 4 injected from the nozzle 10b. A control grid 13 is simultaneously provided between the nozzle 10b and the transparent electrode substrate 2 and the electrification quantity of the spacers 4 passing the control grid 13 is controlled. The positive potential is impressed to a wiring electrode 2a on the side of the transparent electrode substrate 2 when the spraying of the spacers 4 is executed. The spacers 4 are selectively stuck to the substrate by Coulomb force without being stuck to the picture element electrodes. Then, the degradation in the on-off ratio in the picture element electrode parts is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, more specifically referred to as a matrix display system, in which a large number of pixels are arranged in, for example, columns and rows on one display surface. An object of the present invention is to provide a manufacturing method suitable for a liquid crystal display device capable of displaying arbitrary characters, figures, etc. by controlling blinking of pixels.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional liquid crystal display element 90 of this type of matrix system. The liquid crystal display element 90 of this type is arranged in a lattice form so as to intersect in two directions orthogonal to each other. An electrode transparent substrate 91 on which a wiring electrode 91a (only one of which is shown in FIG. 4) and a substantially rectangular pixel electrode 91b arranged between the grids of the wiring electrode 91a are laid.
And a counter transparent substrate 92 on which a counter electrode 92a is laid over substantially the entire surface, for example, by sandwiching a spacer 93 formed in a bead shape having a predetermined diameter with a resin so as to face each other with a predetermined interval. It is what has been.

At this time, the spacer 93 is directly sprayed onto either the electrode transparent substrate 91 or the counter transparent substrate 92 or sprayed in a state of being mixed with a chlorofluorocarbon solvent or the like, and the transparent substrate 91 (or the transparent substrate 92) is sprayed. It is supposed to be distributed almost uniformly on the surface of.

In the actual liquid crystal display element 90,
The liquid crystal 9 enclosed between the transparent substrates 91 and 92 described above.
4. Alignment film 9 that gives the liquid crystal 94 a predetermined alignment direction
5. Liquid crystal 9 according to the potential applied to the wiring electrode 91a
4 is provided with a light-shielding film 96 arranged to cover the wiring electrode 91a for the purpose of making the response other than the display purpose invisible, or a color filter 97 for color display, and the illustration thereof is omitted. A thin film transistor, a diode, or the like for electrically connecting the wiring electrode 91a and the pixel electrode 91b is also provided, but since they are not directly related to the gist of the present invention, detailed description thereof will be omitted here. To do.

[0005]

However, the liquid crystal display element 9 according to the above-mentioned conventional method of spraying the spacers 93 is used.
In the manufacturing method of No. 0, particularly when the liquid crystal display element 90 is of the matrix type as described above, as shown in FIG. 5, the pixel electrode 91b having a size of 50 to 100 μm square has a diameter of 5 to 10 μm. A plurality of spacers 93 are scattered, and light is scattered by the spacers 93, which significantly impairs display quality, or a large number of spacers 93 are concentrated in a specific pixel electrode 91b.
There has been a problem in that the pixel electrode 91b is not substantially operated to cause an element failure and the liquid crystal display element 90 as a whole is a defective product, and a solution to this point has been a problem.

[0006]

According to the present invention, as a concrete means for solving the above-mentioned conventional problems, an electrode transparent substrate in which pixel electrodes and wiring electrodes are laid in a matrix system and a counter electrode are laid. In a method of manufacturing a liquid crystal display device in which spacers are sandwiched between opposed transparent substrates and face each other at appropriate intervals, the spacers are sprayed on the electrode transparent substrate in a dry and negatively charged state. By providing a method for manufacturing a liquid crystal display element, wherein a positive voltage is applied to the wiring electrode of the electrode transparent substrate at the time of spraying the spacers,
The conventional problems are solved by improving the display quality and the production yield.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 denotes a matrix type liquid crystal display element. The liquid crystal display element 1 includes, for example, a wiring electrode 2a (only one of which is shown in the figure) orthogonal to the vertical and horizontal directions and a wiring electrode 2a. The spacer 4 is sandwiched between the electrode transparent substrate 2 on which the substantially rectangular pixel electrodes 2b arranged between the grids are laid, and the counter transparent substrate 3 on which the counter electrodes 3a are laid over substantially the entire surface. The point that they are opposed to each other with a predetermined interval is similar to that of the conventional example.

However, according to the present invention, the method for spraying the spacers 4 is to be carried out in a dry state without using a solvent or the like on the transparent electrode substrate 2 and by charging it to a negative potential. At this time, at the same time, it is assumed that a positive voltage is applied to the wiring electrode 2a of the electrode transparent substrate 2, so that in the obtained liquid crystal display element 1, the spacers 4 are scattered only on the portion of the wiring electrode 2a, and the pixel It is assumed that the electrode 2b is not substantially dispersed.

To explain the above in more detail with reference to FIG. 2, first, the spacer 4 is housed in a tank 10 and a nozzle 10b is provided by applying a pressure from a pipe pipe 10a provided in the tank 10 with nitrogen gas or the like. Is ejected toward the electrode transparent substrate 2 placed on the base 11. At this time, the discharge electrode 12 is provided in the vicinity of the nozzle 10b, and the spacer ejected from the nozzle 10b. 4 is charged negatively.

At the same time, a control grid 13 formed of metal wire in a wire mesh shape is provided in front of the jet direction of the nozzle 10b, that is, in the middle of the nozzle 10b and the electrode transparent substrate 2, and applied to the control grid 13. The negative potential to be
By adjusting in the range of 300V, the charge amount of the spacer 4 passing through the control grid 13 is controlled.

On the other hand, when the spacers 4 are sprayed, a positive potential of, for example, 30 to 100 V is applied to the wiring electrodes 2a on the electrode transparent substrate 2 side. ． Depending on the configuration of the electrode transparent substrate 2, when a positive potential is applied to both the vertical and horizontal wiring electrodes 2a, the pixel electrode 2b also has the same positive potential, for example, the wiring electrode 2a and the pixel electrode 2b are There are some simple matrices connected by diodes, and in this case, a positive potential may be applied only to the wiring electrode 2a on the side that does not affect the pixel electrode 2b.

Next, the operation and effect of the present invention by the above method will be described. The spacers 4 are sprayed in a state of being negatively charged, and the wiring electrodes of the electrode transparent substrate 2 on the side to be sprayed. By applying a positive potential to 2a, the spacer 4 is attracted to the wiring electrode 2a with a very high probability due to the Coulomb force, as shown in FIG. Adhesion shall not occur substantially.

This means that in the liquid crystal display element 1 employing the electrode transparent substrate 2 formed by the method of the present invention, the spacer 4 is substantially absent in the pixel electrode 2b portion, so that the pixel The display of the portion corresponding to the electrode 2b makes the on-off operation clear without causing the refraction by the spacer 4, and at the same time, there is a factor that the spacer 4 concentrates on a specific pixel electrode 2b and causes an element failure. Will be eliminated.

In the liquid crystal display element 1 of this embodiment, the liquid crystal 5, the alignment film 6, the light shielding film 7, the color filter 8 and the like are used as the components other than those described above. As described in the conventional example, since it does not directly relate to the gist of the present invention, detailed description thereof will be omitted and only illustrated, and for the same reason, it is arranged between the wiring electrode 2a and the pixel electrode 2b. The description and illustration of the thin film transistor or the diode to be performed are omitted.

[0016]

As described above, according to the present invention, in the electrode transparent substrate on which the pixel electrode and the wiring electrode are laid, the spacer is sprayed on the electrode transparent substrate in a dry and negatively charged state, A positive voltage is applied to the wiring electrodes of the transparent electrode substrate when the spacers are scattered. The manufacturing method of the liquid crystal display element is that the spacers are selectively attached to the wiring electrodes by the Coulomb force and display is performed. Since the spacers are not attached to the pixel electrodes, it is possible to prevent the deterioration of the on-off ratio caused by the presence of the spacers in the pixel electrode portions and to achieve an extremely excellent effect of improving the display quality.

At the same time, since the spacers are not scattered on the pixel electrode portion, the spacers are scattered on a specific pixel electrode as in the conventional example, and the element defects are generated, so that the entire liquid crystal display device is defective. It is possible to prevent the above-mentioned problems and improve the yield in the production process of the liquid crystal display element, and also to exert an excellent effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a liquid crystal display element formed by a method for manufacturing a liquid crystal display element according to the present invention.

FIG. 2 is an explanatory view showing an example of a method of manufacturing a liquid crystal display element according to the present invention in a manufacturing process.

FIG. 3 is an explanatory view showing a sprayed state of spacers obtained by carrying out the manufacturing method according to the present invention.

FIG. 4 is a cross-sectional view showing a liquid crystal display element formed by a conventional manufacturing method.

FIG. 5 is an explanatory view showing a sprayed state of spacers obtained by a conventional manufacturing method.

[Explanation of symbols]

 1 ... Liquid crystal display element 2 ... Electrode transparent substrate 2a ... Wiring electrode, 2b ... Pixel electrode 3 ... Counter transparent substrate 3a ... Counter electrode 4 ... Spacer 5 ... Liquid crystal 6 ... Alignment film 7 ... Light-shielding film 8 ... Color filter 10 ... Tank 10a ... Pipe piping, 10b ... Nozzle 11 ... Base 12 ... Discharge electrode 13 ... Control grid

Claims (1)

[Claims] 1. A method of manufacturing a liquid crystal display device, wherein a spacer is sandwiched between an electrode transparent substrate in which pixel electrodes and wiring electrodes are laid in a matrix method and a counter transparent substrate in which a counter electrode is laid so as to face each other at appropriate intervals. The spacers are applied to the electrode transparent substrate in a dry and negatively charged state, and a positive voltage is applied to the wiring electrodes of the electrode transparent substrate when the spacers are applied. And a method for manufacturing a liquid crystal display device.