JPS6055381A - Manufacture of color image display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a color image display device configured by combining a color filter, a liquid crystal, and a semiconductor integrated circuit. It is about the method.

Conventional Structure and Its Problems An example of the structure of an image display device constructed by combining a liquid crystal and a MOS type transistor is shown in FIG.

A unit picture element is composed of a MOS transistor 1, a storage capacitor 2, and a liquid crystal cell 3, and the operating principle of the image display device is as follows. for example,
Now, a gate signal is applied to the Xi terminal and the horizontal MO
S) When the transistor group is turned on, the video signal passes through the transistor 1 from the yi terminal and charges the capacitor 2.

Even if the gate signal disappears, as long as the charge stored in the capacitor 2 continues to apply voltage to the liquid crystal cell 3, the liquid crystal cell 3 changes the magnitude of dynamic scattering according to the voltage, so that the liquid crystal cell 3 passes through the liquid crystal cell 3. It is possible for the light to continue to be modulated by the video signal voltage. The charge stored in capacitor 2 is transferred to transistor 1 until the next gate signal is applied.
It leaks through the off-resistance of the liquid crystal cell 3 and the resistance of the liquid crystal cell 3.

As shown in Figure 1, it is possible to construct a television by arranging unit pixels in a matrix and scanning them in the X and Y directions, and as mentioned earlier, transistors are turned on simultaneously in the horizontal direction. The video signal group is then written into the capacitor group, and the gate signal group is sequentially scanned in the vertical direction. The so-called line scanning provides the same effect as a CRT.

FIG. 2 shows a cross-sectional view of the unit picture element shown in FIG. 1 integrated into an integrated circuit. Here, we will discuss a transmission-type image display that incorporates an aluminum gate transistor with silicon as a semiconductor on a sapphire substrate 17 as the drive section A, but the material of the conductive paths other than the transparent electrode group does not matter, so polycrystalline silicon is used. I don't mind if it's used.

The transistor 1 of the driving section has a drain or a source 4. A channel part 6, a source or drain 6 are formed, 7 is an aluminum gate, 8 is a gate, and an oxide film. 9 is a silicon oxide film that protects the surface of the transistor;
is an insulating material that covers everything other than the picture elements, such as silicon oxide, which is most suitable. Reference numeral 12 denotes an insulating film made of a transparent material, which forms the capacitor 2 together with the transparent electrode groups 11 and 13. The aluminum line 4a is in electrical contact with the drain or source 4, and the aluminum line 6a is in electrical contact with the source or drain 6 and the transparent electrode group 13, respectively. Transparent electrode group 11.13 is SnO2
, In2O3, etc. are generally formed by vapor deposition. 16 is a glass plate, 15 is a transparent electrode formed on 16, and constitutes a counter electrode plate B. 14
is a liquid crystal integrated circuit on a sapphire substrate 17 and a transparent electrode 1
5, and constitutes the liquid crystal cell 3 together with the transparent electrode 13. Since the light (arrow C) incident from below the sapphire substrate 17 is appropriately scattered by the liquid crystal cell 3, it functions as a transmission type image display device.

Now, in order to colorize the above-mentioned image display device, as is well known, each picture element is assigned to the three primary colors of light, ie, red@), as shown in FIG.

It is necessary to develop a color of green ('') + 17 (B). Conventionally, three primary color filters 18 are placed in advance between the glass substrate 16 of the counter electrode plate and the transparent electrode 15 so as to correspond to the transparent electrode 13 of the drive section. It was common to form the liquid crystal separately and then assemble the color image device, that is, to seal the liquid crystal between the substrates A, 1!1:B.

However, the method shown in FIGS. 4(A-D) has been used to form the conventional color filter 18.

That is, polyvinyl and alcohol were placed on an optically polished glass substrate 16 as a counter electrode plate.

A photosensitive liquid made by imparting photosensitivity to gris, gelatin, casein, etc. with ammonium dichromate, etc. is applied uniformly using a roller coat, dipping, spinner, etc. After drying, only the first color pattern area is exposed using a mask exposure method. After forming the dyed base film 21 by photo-curing and developing to remove patterns other than the necessary patterns, a dye having predetermined spectral characteristics is used.
Dye the pattern with the first color. Next, a transparent resist dyeing film 22 that will not be dyed with dye is applied to the entire surface (Fig. 4 (8)
)).

Next, as shown in FIG. 4(B), the same photosensitive liquid as above is applied uniformly, dried, and then exposed and developed using a mask exposure method to form a dyed base film 23 of the second color. dyeing with a second dye having spectral properties of . Furthermore, the transparent resist dyeing film 24 is applied to the entire surface.

Next, in the same manner, as shown in FIG. 4 (q), the same photosensitive solution as above is applied uniformly, dried, and then exposed and developed using a mask exposure method to form a third color dyed base film 25. , dyeing with a third dye having predetermined spectral properties.

Finally, a top coat 26 is applied to manufacture the three primary color filter 18 as shown in Ω in FIG.

When assembling a color image display device, it is naturally necessary to align the three primary color filters with the transparent electrodes 13 of the unit picture elements in FIG. 3, but this alignment process requires high precision, resulting in poor yield. However, it also requires a lot of manpower, which is a cause of high product costs.

Further, the manufacturing of the three primary color filters described above also involves a large number of steps and is a cause of high costs.

Purpose of the Invention In view of the drawbacks of the conventional filter manufacturing method during assembly as described above, the present invention eliminates the need for alignment of three primary color filters as in the conventional method when assembling a color image display device, and furthermore, It is an object of the present invention to provide a method of manufacturing a color image display device that reduces the manufacturing cost of a filter.

Structure of the Invention The present invention actively utilizes an electrode group for operating a liquid crystal and a MOS transistor 1 in the process of manufacturing a three-primary color filter in the manufacture of a color image display device, and directly applies three primary color filters onto an electrode group ring. It is characterized by forming spectral filters separately.

In other words, while operating the MOS transistor group repeatedly, a voltage is applied to each predetermined address of the electrode group t, and this electrode group ←4 and the second external electrode are connected to each other. Apply an electric field between.

Using a method of coagulating and precipitating an electrodeposition paint having predetermined spectral characteristics only above the transparent electrode group village of the address being operated in the electrodeposition bath, color filters of three primary colors are formed by distributing them three times. It is characterized by

DESCRIPTION OF THE EMBODIMENTS For example, as shown in FIGS. 5 and 6, the red filter of the three primary colors is
7j, yj+3+Yj+6 . . . When forming the sample at the address 1, X□,
□+1"i+3...(ij,]u integer) 19 groups of MOS transistors are turned on by applying a voltage to the MOS transistor gate terminal 33, and the terminal 34 (7iryi+3'y1+6...) into which the video signal is input is turned on. A positive voltage is applied to ) to generate an electric field between it and the second external electrode 36, and xi + Y j + xi + 113' j +
A red electrodeposition paint having predetermined spectral characteristics is coagulated and deposited only on the transparent EANIFM group 13 at the address xi ``j+31xi+I Iyj+3...'' to form the red filter 2o.

Next, in the same way, x s + '5' ) +1 '・
... Green on the address, Xl-ry5 + 2 ...
...If a blue filter is formed at the address.

Three primary color filters can be distributed and formed for each address in the city.

Finally, by combining the driving section on which the color filter is formed and the counter electrode plate, and filling the gap with liquid crystal, the color image display device shown in FIG. 7 can be easily manufactured.

In addition, as the above-mentioned electrodeposition paint, maleated oil is used.

Pigments and dyes exhibiting predetermined spectral characteristics can be mixed with vinyl-modified maleated oil, micropentadiene-modified maleated oil, alkyd resin, acrylic resin, aphenol resin, melamine resin, and the like. For example, if it is a blue pigment, it is Phthalocyanine Blue, if it is a green pigment, it is Phthalocyanine Green, and if it is a red dye, it is Orazole Pink 5.
BLG (-f-bageigy brand name) may also be used.

It is clear that the transparent insulating substrate is not limited to sapphire, and the semiconductor is not limited to silicon.

Furthermore, in the embodiments of the present invention, a transmissive type is described in detail, but it is clear that a reflective type can be manufactured if the transparent electrode 13 of the drive section is made of a metal with high reflectivity, such as M or the like. Note that at this time, an St single crystal may be used instead of the transparent insulating substrate.

Furthermore, in this example, a case was shown in which an electrocoated paint, that is, a charged liquid was used, but instead of the electrocoated paint, an electrostatic toner, that is, a fine powder of three primary colors that was charged, was used. It is clear that the same effect can be achieved by forming color filters by applying toner and heating.

Effects of the Invention By using the method of the present invention, the transparent electrode of each picture element formed in the drive circuit section is coated with a predetermined repeating pattern three times.
Primary color filters can be easily formed.

On the other hand, by forming the three primary color filters in the drive section, it is not necessary to align the counter electrode plate and each picture element as in the conventional case when assembling the color image display device.

Therefore, the manufacturing process of the three primary color filters is greatly simplified, and the assembly precision can be greatly reduced, making it possible to significantly reduce the cost of the color image display device.

[Brief explanation of the drawing]

Fig. 1 is an equivalent circuit diagram of an image display device consisting of a liquid crystal cell and a semiconductor integrated circuit, Fig. 2 is a cross-sectional view of a unit pixel of the display device, and Fig. 3 is a cross-sectional view showing the structure of a conventional color image display device. Figures 4A to 4C are process sectional views taken along line xx' in the fourth diagram showing the manufacturing process of a conventional three-primary color filter, a top view of the fourth DH color filter, and Figure 5 is a process cross-sectional view of the fourth DH color filter. FIG. 6 is a conceptual diagram for explaining the filter manufacturing method of the present invention, and FIG. 7 shows the structure of the color image display device manufactured by the method of the present invention. FIG. 1...MO8 type transistor, 2...
Storage capacitor, 3...Liquid crystal cell, 11.1
3,15゜23...Transparent electrode, 14...
・Liquid crystal that produces a dynamic scattering field, 17... Transparent insulating substrate, 19... MO3fi) transistor, 20... Filter, 31... Electrical Adhesive paint, 33...Second electrode. Name of agent: Patent attorney Toshio Nakao and 1 other person
Figure 11 Figure 2 Figure 3

Claims (3)

[Claims] (1) A liquid crystal When manufacturing a color image display device filled with , an electric field is applied to a predetermined portion of the electrode group, and an electrodeposited material having predetermined spectral characteristics is solidified and deposited only on the electrode group to which one electric field is applied. A method of manufacturing a color image display device, comprising forming the color filter. (2) A method of manufacturing a color image display device according to claim 1, wherein the electrode group is formed of a transparent electrode or a metal with good reflectance. (3) A method for manufacturing a color image display device according to claim 1, characterized in that an electrostatic toner having predetermined spectral characteristics of three primary colors is used as an electrodeposition material.