JP3105187B2 - Color liquid crystal panel and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel having a color image display function, and more particularly to an IPS type liquid crystal panel having a wide viewing angle and a method of manufacturing the same.

[0002]

2. Description of the Related Art Recent advances in microfabrication technology, liquid crystal material technology, packaging technology, and the like have led to the commercialization of television images and various image displays on a 5 to 50 cm diagonal liquid crystal panel that are comparable to CRTs. Offered on a base. By forming three colored layers of R, G, and B on one of two glass substrates constituting the liquid crystal panel,
Color display is also easily realized. In particular, in a so-called active type liquid crystal panel in which a switching element is incorporated for each picture element, an image having little crosstalk, high-speed response, and a high contrast ratio is guaranteed.

[0003] These liquid crystal panels have one scanning line.
Generally, a matrix organization of about 100 to 1000 lines and about 200 to 2,000 signal lines is used, but recently, a large screen and high definition have been simultaneously advanced.

FIG. 10 shows a state of mounting on a liquid crystal panel.
A COG (Chip-On) for directly connecting a semiconductor integrated circuit chip 3 that supplies a drive signal to one of the transparent insulating substrates constituting the liquid crystal panel 1, for example, a scanning line electrode terminal group 6 formed on a glass substrate 2. -Glass) method or a TCP film 4 having gold-plated copper foil terminals (not shown) based on, for example, a polyimide-based resin thin film, and a suitable adhesive containing a conductive medium to the electrode terminal group 5 of the signal line. An electric signal is supplied to the image display unit by a mounting means such as a TCP system which is pressed and fixed by the above method. Here, for the sake of convenience, two mounting schemes are shown at the same time, but it goes without saying that one of the two schemes is actually selected as appropriate.

Reference numerals 7 and 8 denote wiring paths for connecting the image display portion at the center of the liquid crystal panel 1 to the electrode ends 5 and 6 of the signal lines and the scanning lines. It does not need to be made of wood. Reference numeral 9 denotes a glass substrate which is another transparent insulating substrate having a transparent conductive counter electrode common to all liquid crystal cells, and two glass substrates 2 and 9 constituting the liquid crystal panel 1 are made of resinous fibers or It is formed at a predetermined distance of about several μm by a spacer material such as beads, and the gap is sealed at the peripheral portions of the glass substrates 2 and 9 with a sealing material made of an organic resin and a sealing material. The closed space is filled with liquid crystal.

In order to realize a color display, an organic thin film having a thickness of about 1 to 2 μm containing one or both of a dye and a pigment called a colored layer is deposited on the closed space side of the glass substrate 9 to form a color. Since a display function is provided, in that case, the glass substrate 9 is also called a color filter. Then, depending on the properties of the liquid crystal material, a polarizing plate is stuck on one or both of the upper surface of the glass substrate 9 and the lower surface of the glass substrate 2, and the liquid crystal panel 1 functions as an electro-optical element.

FIG. 11 is an equivalent circuit diagram of an active liquid crystal panel in which, for example, a thin-film insulated gate transistor is arranged as a switching element for each picture element. The elements drawn in solid lines are formed on the active substrate 2 which is one glass substrate, and the elements drawn in broken lines are formed on the other glass substrate 9. Scan line 11 and signal line 12
Is a TFT (thin film transistor) using amorphous silicon as a semiconductor layer and a silicon nitride layer as a gate insulating layer, for example.
Simultaneously with the formation of 10, it is produced on the active substrate 2 (one glass substrate).

The liquid crystal cell 13 includes a transparent conductive picture element electrode 14 formed on the active substrate 2 and a transparent conductive counter electrode 15 formed on the color filter 9 (the other glass substrate). And a liquid crystal 16 which fills a closed space formed by the two glass substrates 2 and 9, and may be electrically treated the same as a capacitor. Several choices can be made regarding the configuration of the storage capacitor for increasing the time constant of the liquid crystal cell 13. For example, in FIG. 11, the storage capacitor 17 includes a common electrode 18 and a pixel electrode 14 that are common to all the pixels. It is formed via an insulating layer such as a gate insulating layer of an insulated gate transistor.

FIG. 12 is a sectional view of a main part of a liquid crystal panel for color display. As described above, the colored layer 19 made of dyed photosensitive gelatin or colored photosensitive resin is disposed on the closed space side of the color filter 9 corresponding to the pixel electrode 14.
The three primary colors of GB are arranged according to a predetermined arrangement. The counter electrode 15 common to all the pixel electrodes 14 is formed on the colored layer 19 as shown in order to avoid a voltage distribution loss in the liquid crystal cell due to the interposition of the colored layer 19. A polyimide resin thin film layer 20 having a thickness of, for example, about 0.1 μm, which is adhered on the two glass substrates 2 and 9 in contact with the liquid crystal 16, is an alignment film for aligning liquid crystal molecules in a predetermined direction. It is. In addition, when a twisted nematic (TN) type liquid crystal is used, two polarizing plates 21 are required on the upper and lower sides.

When a low-reflection opaque film 22 is disposed at the boundary between the R, G, and B colored layers 19, reflected light from a wiring layer such as the signal line 12 on the active substrate 2 can be prevented, and image contrast can be reduced. The ratio is improved, and the leakage current at the time of the OFF operation of the switching element TFT 10 due to external light irradiation can be prevented from increasing, so that the liquid crystal panel can be operated even under strong external light.
M). Many BM configurations are conceivable, but it is disadvantageous in terms of cost in consideration of the occurrence of steps at the boundary between adjacent colored layers and light transmittance. However, a Cr thin film having a thickness of about 0.1 μm is simple. And reasonable.

In FIG. 12, for simplicity of understanding, in addition to the TFT 10, the scanning line 11, and the storage capacitor 17, components such as a back light source and a spacer are omitted.
Reference numeral 23 denotes a conductive thin film for connecting the pixel electrode 14 and the drain of the TFT 10, and is generally formed simultaneously with the same member as the signal line 12 and is called a drain wiring (electrode). Although not shown here, the counter electrode 15 is connected to an appropriate conductive pattern on the active substrate 2 having the TFT 10 via an appropriate conductive paste at an outer peripheral portion slightly outside the image display portion, Electrical connection is provided by being incorporated in a part of the electrode terminal groups 5 and 6.

The above-mentioned liquid crystal cell using the conventional TN liquid crystal has a drawback that the viewing angle is narrow, and while the screen size of the liquid crystal panel is small, it was not an urgent development task.
cm, and a plurality of people have come to view the screen at the same time for applications such as monitors, so that the technical development for expanding the viewing angle has been rapidly accelerated.

IPS (In-Plain-Switc) for expanding viewing angle
In a liquid crystal panel of the hing) type, as shown in FIG. 13, a liquid crystal cell is connected to a pair of comb-shaped opposing electrodes 41 formed on the active substrate 2 at a predetermined distance (10 to 20 μm). It is composed of an electrode 42 and a liquid crystal filled between two glass plates 2, 9. Compared with a conventional liquid crystal panel, a transparent conductive pixel electrode 1 is provided on the active substrate 2.
4 and the counter electrode 15 on one main surface of the color filter are not required. The picture element electrode 42 can be activated by being connected to the drain of the insulated gate transistor, but the details are omitted here. Incidentally, reference numeral 43 denotes an arrangement state of liquid crystal molecules in the liquid crystal cell.

Recently, even in a large panel having a diagonal width of 25 cm or more, high definition has been promoted simultaneously in order to improve display capacity and display image quality, and it has been required to secure an aperture ratio. Two substrates constituting the
Improving the bonding accuracy of No. 9 has suddenly become a technical problem. Specifically, the pasting accuracy of several μm was sufficient in the past, but 2 μm was required to increase the aperture ratio to 80% or more.
The following high precision is required.

The bonding accuracy of the liquid crystal panel is the sum of the processing accuracy of the active substrate and the color filter and the bonding accuracy of the above two substrates in the bonding process. As the substrate is larger, the warpage and undulation of the glass substrate are also added, and the accuracy is reduced.

At the time of bonding, the two substrates can be formed with an accuracy of 1-2 μm.
Although it is not difficult to consider in terms of the mechanism and ability of a high-precision exposure machine for large substrates, the accuracy that can be practically secured due to the warpage of the glass substrate during the seal curing process is several At present, it is reduced to μm.

[0017]

Among the curing steps, one of the most important is the problem of temperature uniformity. Since the expansion coefficient of a glass substrate is several ppm per 1 ° C., for example, if a temperature difference of 10 ° C. is between two glass substrates having a size of 30 cm, a difference in expansion and contraction of 10 to 20 μm will occur. . For this reason, heating and
Cooling requires slow heating and slow cooling, but it does not take too much time to reduce productivity.

Attempts have been made to lower the temperature of the seal resin to 100 ° C. or less in the heat curing, but generally, when the curing temperature is lowered, the airtightness and the adhesion are inevitably reduced. In addition, it is inevitable that the residual solvent in the sealing resin dissolves in the liquid crystal and the retention of the liquid crystal cell is reduced, and the display characteristics of the liquid crystal panel are deteriorated at high temperatures and during long-term operation. Although it is conceivable to use only an ultraviolet-effect-type sealing resin, it seems that it has not yet reached a practical level.

Regarding the production of color filters, most of exposure machines used from the viewpoint of cost are of the proximity type, and are more accurate than stepper and mirror projection exposure machines used for producing active substrates. The total pitch of about 2 μm is the limit of mass production, and there are many problems in high-precision bonding from the viewpoint of accuracy.

The present invention has been made in view of the above situation, and relates to the conventional bonding by forming a colored layer having a color display function on an active substrate in an IPS type liquid crystal panel having a wide viewing angle. It is intended to avoid various issues.

[0021]

According to the color liquid crystal panel of the present invention, a thick transparent insulating layer is formed on a first transparent insulating substrate having a picture element electrode connected to the drain of an insulated gate transistor. A grid-like counter electrode is formed on a thick transparent insulating layer at least on a scanning line and a signal line at a predetermined distance from the picture element electrode, and a colored layer is further formed on the counter electrode for each color. A part of the counter electrode on the line or on the signal line and on the scanning line is partially formed on the stripe or on the island, and on the signal line or on the signal line and on the scanning line between the colored layers. A black coloring layer is formed on the counter electrode, and a liquid crystal is filled between the first transparent insulating substrate and the second transparent insulating substrate.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The liquid crystal panel according to claim 1 is
Having a plurality of scanning lines on one main surface, having a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers, for each intersection of the scanning lines and signal lines An insulated gate transistor, a picture element electrode connected to a drain of the insulated gate transistor, and at least one counter electrode formed at a predetermined distance from the picture element electrode; A liquid crystal panel including a first transparent insulating substrate having a coloring layer containing a pigment on a display region formed by a pixel electrode and a counter electrode, and a liquid crystal filled between the second transparent insulating substrate. Then, a grid-like counter electrode is formed at least on the scanning lines and the signal lines via a thick transparent insulating layer formed on the first transparent insulating substrate, and the colored layer is formed for each color (R , G, B), including a part of the counter electrode on the signal line. Is formed into an island shape include part of the counter electrode on the upper and the scanning lines of the looped or signal lines,
A black coloring layer containing either or both of a dye and a pigment is formed on the counter electrode on the signal line between the coloring layers or on the signal line between the coloring layers and on the counter electrode on the scanning line. It is characterized by.

A liquid crystal panel according to a second aspect has a plurality of scanning lines on one main surface and a plurality of signal lines which are substantially orthogonal to the scanning lines via at least one or more insulating layers. The insulated gate transistor, the pixel electrode connected to the drain of the insulated gate transistor, and the pixel electrode were formed at a predetermined distance from each other at the intersection of the scanning line and the signal line. A first transparent insulating substrate having at least one counter electrode, a first transparent insulating substrate having a coloring layer containing a pigment on a display region formed by the picture element electrode and the counter electrode, and a second transparent insulating substrate. A liquid crystal panel having a liquid crystal filled between them, wherein the liquid crystal panel has a grid-like opposing pattern on the scanning lines and the signal lines via a thick transparent insulating layer formed on a first transparent insulating substrate. An electrode is formed, and a colored layer is formed for each color (R,
G, B) are formed in a stripe shape including a part of the counter electrode on the signal line or in an island shape including a part of the counter electrode on the signal line and a part of the counter electrode on the scanning line. A black coloring layer containing one or both of a dye and a pigment is formed on the counter electrode on the signal line or on the signal line between the coloring layers and on the counter electrode on the scanning line. A transparent insulating layer is formed on the layer.

According to a third aspect of the present invention, there is provided a liquid crystal panel having a plurality of scanning lines on one main surface, and a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers. The insulated gate transistor, the pixel electrode connected to the drain of the insulated gate transistor, and the pixel electrode were formed at a predetermined distance from each other at the intersection of the scanning line and the signal line. A first transparent insulating substrate having at least one counter electrode, a first transparent insulating substrate having a coloring layer containing a pigment on a display region formed by the picture element electrode and the counter electrode, and a second transparent insulating substrate. A liquid crystal panel having a liquid crystal filled between the first and second transparent insulating substrates, wherein a grid-like liquid crystal panel is formed on at least the scanning lines and the signal lines via a thick transparent insulating layer formed on the first transparent insulating substrate. Display area including the counter electrode and the opening above the drain A pixel electrode is formed on the signal line, and the colored layer includes a part of the counter electrode on the signal line for each color (R, G, B) in a stripe shape or on the signal line and on the scanning line. A dye or pigment is formed in an island shape including a part of the counter electrode, and on the counter electrode on the signal line between the colored layers or on the signal line between the colored layers and on the scanning line. Characterized in that a black colored layer containing any one or both of them is formed.

According to a fourth aspect of the present invention, there is provided a liquid crystal panel having a plurality of scanning lines on one main surface, and a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers. The insulated gate transistor, the pixel electrode connected to the drain of the insulated gate transistor, and the pixel electrode were formed at a predetermined distance from each other at the intersection of the scanning line and the signal line. A first transparent insulating substrate having at least one counter electrode, a first transparent insulating substrate having a coloring layer containing a pigment on a display region formed by the picture element electrode and the counter electrode, and a second transparent insulating substrate. A liquid crystal panel having a liquid crystal filled between the first and second transparent insulating substrates, wherein a grid-like liquid crystal panel is formed on at least the scanning lines and the signal lines via a thick transparent insulating layer formed on the first transparent insulating substrate. Display area including the counter electrode and the opening above the drain A pixel electrode is formed on the signal line, and the colored layer includes a part of the counter electrode on the signal line for each color (R, G, B) in a stripe shape or on the signal line and on the scanning line. A dye or pigment is formed in an island shape including a part of the counter electrode, and on the counter electrode on the signal line between the colored layers or on the signal line between the colored layers and on the scanning line. And a transparent insulating layer is formed on the colored layer and the black colored layer.

A method of manufacturing a liquid crystal panel according to a fifth aspect is the method of manufacturing a liquid crystal panel according to the first aspect,
An insulated gate transistor on a first transparent insulating substrate,
Forming a pixel electrode connected to the scanning line, the signal line, and the drain of the insulated gate transistor; and forming a thick transparent insulating layer on the first transparent insulating substrate;
Forming a counter electrode on at least the scan line and the signal line on the thick transparent insulating layer; and forming a colored layer for each color (R, G) including a part of the counter electrode on the signal line. , B) to form a stripe or an island shape including a part of the counter electrode on the signal line and the scanning line, and to form an island on the counter electrode on the signal line between the colored layers by electrodeposition. Forming a black colored layer containing one or both of a dye and a pigment on the signal electrode between the layers and on the counter electrode on the scanning line.

[0027] A method of manufacturing a liquid crystal panel according to claim 6 is the method of manufacturing a liquid crystal panel according to claim 2, wherein
An insulated gate transistor on a first transparent insulating substrate,
Forming a scanning line, a signal line, and a drain connected to a drain of the insulated gate transistor; and forming a thick transparent insulating layer on the first transparent insulating substrate;
Forming a counter electrode on at least the scan line and the signal line on the thick transparent insulating layer; and forming a colored layer for each color (R, G) including a part of the counter electrode on the signal line. , B) to form a stripe or an island shape including a part of the counter electrode on the signal line and the scanning line, and to form an island on the counter electrode on the signal line between the colored layers by electrodeposition. Forming a black colored layer containing one or both of a dye and a pigment on the counter electrode on the interlayer signal line and on the scanning line; and forming a transparent insulating layer on the colored layer and the black colored layer And a step of performing

A method of manufacturing a liquid crystal panel according to claim 7 is the method of manufacturing a liquid crystal panel according to claim 3,
An insulated gate transistor on a first transparent insulating substrate,
Forming a scanning line and a signal line; forming a thick transparent insulating layer having an opening on the drain of the insulated gate transistor on the first transparent insulating substrate; Forming a counter electrode on at least the scanning line and the signal line, and a pixel electrode including the opening, and forming a colored layer including a part of the counter electrode on the signal line. A step of forming a stripe shape or an island shape including a part of the counter electrode on the signal line and the scanning line for each color (R, G, B); Forming a black colored layer containing either or both of a dye and a pigment on the counter electrode or on the signal line between the colored layers and on the counter electrode on the scanning line.

The method of manufacturing a liquid crystal panel according to claim 8 is the method of manufacturing a liquid crystal panel according to claim 4,
An insulated gate transistor on a first transparent insulating substrate,
Forming a scanning line and a signal line; forming a thick transparent insulating layer having an opening on the drain of the insulated gate transistor on the first transparent insulating substrate; Forming a counter electrode on at least the scanning line and the signal line, and a pixel electrode including the opening, and forming a colored layer including a part of the counter electrode on the signal line. A process of forming a stripe shape or an island shape including a part of a counter electrode on a signal line and a scanning line for each color (R, G, B) and opposing on a signal line between colored layers by electrodeposition Forming a black colored layer containing one or both of a dye and a pigment on the electrode or on the signal line between the colored layers and on the counter electrode on the scanning line; and on the colored layer and the black colored layer. Forming a transparent insulating layer.

According to the liquid crystal panel of the first aspect, the colored layer having a color display function is formed on the liquid crystal cell constituted by the counter electrode and the pixel electrode, and the black colored layer having the BM function is formed by the counter electrode. , Are formed with high precision. Therefore, the relative positional accuracy between the coloring layer and the liquid crystal cell is improved. Further, the counter electrode which does not contribute to the image display is formed on the scanning line and the signal line which also do not contribute to the image display, so that the aperture ratio is also improved.

According to the liquid crystal panel of the present invention, the colored layer and the black colored layer are covered with the transparent insulating layer. The release of gas components is suppressed, and the reliability of the liquid crystal panel is improved.

According to the liquid crystal panel of the present invention, the picture element electrode and the counter electrode are formed on the same surface.
In addition to the same operation as described above, the efficiency of the drive voltage applied between the electrodes is improved, and the drive voltage from the external drive circuit can be reduced.

According to the liquid crystal panel of the present invention, the colored layer and the black colored layer are covered with the transparent insulating layer. The release of gas components is suppressed, and the reliability of the liquid crystal panel is improved.

According to the method of manufacturing a liquid crystal panel of the present invention, the black colored layer is formed by electrodeposition on the counter electrode when the panel is manufactured, so that the step between the colored layer and the black colored layer is eliminated. In addition to the same effect as in the first aspect, there is an effect that the alignment processing is facilitated and the display image quality is improved.

According to the liquid crystal panel manufacturing method of the present invention, since the colored layer and the black colored layer are further covered with the transparent insulating layer, elution of impurities and emission of gas components from the colored layer and the black colored layer are prevented. As a result, the reliability of the liquid crystal panel is improved.

According to the liquid crystal panel manufacturing method of the present invention, since the picture element electrode and the counter electrode are formed on the same surface when manufacturing the panel, the driving voltage from the external driving circuit can be reduced. it can.

According to the liquid crystal panel manufacturing method of the present invention, the elution of impurities and the release of gas components from the coloring layer and the black coloring layer are further suppressed, and the driving voltage from the external driving circuit is reduced. As a result, a highly reliable liquid crystal panel can be obtained.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. Parts having the same functions as those of the conventional example are denoted by the same reference numerals. (Embodiment 1) FIG. 1 is a plan view of an active substrate according to (Embodiment 1) of the present invention, and FIGS.
(D), FIG. 3 is a sectional view taken along the line AA ′ of FIG. 1, and FIG. 4 is another plan view of the active substrate according to the first embodiment of the present invention.

In FIG. 1, reference numeral 27 denotes a thick transparent insulating layer formed on the first transparent insulating substrate 2, and reference numeral 41 denotes at least the upper part of the scanning lines and the upper part of the signal lines via the thick transparent insulating layer 27. (Not shown), a grid-shaped counter electrode, 42
Is a picture element electrode connected to a drain electrode (not shown) of the insulated gate transistor of the first transparent insulating substrate 2. The coloring layer 19 is formed on the transparent insulating layer 41 in a stripe shape including a part of the counter electrode 41 on the signal line for each color (R, G, B).

In the process of the first embodiment, first, as shown in FIG. 2A, at least one insulated gate transistor 10 serving as a switching element is provided on one main surface of the first transparent insulating substrate 2. And the scanning line 11 (not shown), the signal line 12, the drain electrode 23, and the picture element electrode 42 connected to the drain electrode 23 are sequentially formed to activate the first transparent insulating substrate 2. Reference numeral 25 denotes a transparent insulating layer such as a gate insulating layer, as described above, and is often laminated with different kinds of insulating layers in order to reduce the probability of a short circuit between the scanning line 11 and the signal line 12. 26 schematically shows a semiconductor layer forming a channel of the insulated gate transistor 10.

Next, as shown in FIG. 2B, a thick transparent insulating layer 27 is formed on one main surface of the first transparent insulating substrate 2, and the surface is flattened. When the photosensitive material, for example, Optmer PC302 (trade name, manufactured by Nippon Synthetic Rubber Co., Ltd.) is used as the transparent insulating layer 27, the formation of the transparent insulating layer 27 and the terminal electrodes 5, 6 can be formed simultaneously, which is reasonable.

Subsequently, as shown in FIG. 2C, a grid-like structure is preferably formed on the transparent insulating layer 27 on the scanning line 11 and the signal line 12 including also on the insulated gate transistor 10. The conductive counter electrode 41 is formed at a predetermined distance from the pixel electrode 42. Insulated gate transistor 10
The counter electrode 41 extended above constitutes a light shield for blocking external light.

The thickness of the transparent insulating layer 27 is at least 1 μm
The reason why the film is preferably formed with a thickness of preferably 2 to 3 μm is as follows.
This is because, in addition to the flattening of the transparent insulating layer 27, it is desired to minimize the capacitance of the counter electrode 41 and the scanning line 11 and the signal line 12 via the transparent insulating layer 27. This is because these capacitances increase the electric load on the scanning lines 11 and the signal lines 12 to increase the power consumption of the liquid crystal panel, reduce the response speed, and lower the image quality such as crosstalk. It is.

After the formation of the counter electrode 41, FIGS. 1 and 2 (d)
As shown in (1), a coloring layer 19 containing a pigment is formed on one main surface of the first transparent insulating substrate 2 by photolithography using a photosensitive resin in which a pigment is dispersed. Counter electrode 41
Are formed in stripes (vertical stripes) for each of the colors (R, G, B) including a part of. Alternatively, as shown in FIG.
2 and a part of the counter electrode 41 on the scanning line 11 may be formed in an island (dot) shape for each picture element.

Thereafter, as shown in FIG. 3, the signal lines 12 are formed between the colored layers 19 by the electrodeposition method on the counter electrode 41 on the signal lines 12 or around the island-shaped colored layers 19. And a black colored layer 29 containing either or both of a black dye and a pigment is deposited on the counter electrode 41 on the scanning line 11. For this purpose, the pattern of the counter electrode 41 is extended to the peripheral portion of the active substrate 2 to provide an appropriate potential supply location, and a DC potential is applied to the potential supply location using a jig such as a clip, and the potential in the insulating container is reduced. Electrodeposition is performed by immersing the active substrate 2 in an electrodeposition solution containing either or both of a black dye and a pigment, but the details are omitted here.

The thickness of the black coloring layer 29 is set to be the same as that of the coloring layer 19 so that the coloring layer 19 and the black coloring layer 29 are substantially flat. Of course, three colors (R, G,
It is desirable to consider the degree of dispersion and transmittance of the pigment so that the thickness of the colored layer 19 of B) is also uniform. Through the above manufacturing steps, the active substrate according to the first embodiment of the present invention is completed.

The active substrate 2 on which the colored layer 19 having the color display function is formed is bonded to the second transparent insulating substrate to form a panel, thereby completing the IPS color liquid crystal panel.

(Embodiment 2) FIG. 5 shows an active substrate process according to (Embodiment 2) of the present invention. Also in (Embodiment 2), as shown in FIGS. 2A to 2D and FIG. 3, the same manufacturing steps as in (Embodiment 1) are performed up to the formation of the coloring layer 19 and the black coloring layer 29. Then, as shown in FIG. 5, a protective transparent insulating layer 30 is formed on the colored layer 19 and the black colored layer 29. The thickness should be relatively thin, from 0.1 to 0.3 μm.

The reason why the transparent insulating layer 30 is preferably formed on the coloring layer 19 and the black coloring layer 29 is, in part, for the reason that undesirable ionic impurities from the black coloring layer 29 formed by the electrodeposition method in the liquid crystal. The second is to prevent undesired gas release from the colored layer 19 and the black colored layer 29. These eluted or released components are likely to dissolve into the liquid crystal and cause obstacles to degrade the liquid crystal. This is a matter to be noted particularly in operation at high temperatures, and is known as an OC (overcoat) protective film even in a conventional color filter. Technology.

Thus, the active substrate 2 according to the second embodiment is completed. Then, it is bonded to the second transparent insulating substrate to form a panel, and a color liquid crystal panel is completed. (Embodiment 3) FIG. 6 is a plan view of an active substrate according to (Embodiment 3) of the present invention, and FIGS.
(C) and FIGS. 8 (a) and 8 (b) are cross-sectional views taken along the line AA 'in FIG.

In (Embodiment 3), first, FIG.
As shown in (a), at least one insulated gate transistor 10 serving as a switching element, a scanning line 11 (not shown), a signal line 12 and a drain electrode are provided on one main surface of the first transparent insulating substrate 2. 23 are sequentially formed to activate the first transparent insulating substrate 2.

Next, as shown in FIG. 7B, a thick transparent insulating layer 27 is formed on one main surface of the first transparent insulating substrate 2 so as to have an opening 31 on the drain electrode 23. Form and planarize the surface. As described above, it is reasonable to use a photosensitive material such as Optmer PC302 manufactured by Nippon Synthetic Rubber Co., Ltd. as the transparent insulating layer 27.

Subsequently, as shown in FIG. 5C, a grid-like pattern is formed on the transparent insulating layer 27, preferably on the scanning line 11 and also on the signal line 12, including also on the insulated gate transistor 10. The counter electrode 41 and the pixel electrode 42 including the opening 31 are formed of the same conductive material at a predetermined distance.

After the formation of the counter electrode 41 and the picture element electrode 42, as shown in FIGS. 6 and 8A, a photosensitive material in which a pigment is dispersed on one main surface of the first transparent insulating substrate 2 is provided. Coloring layer 19 containing a pigment by photolithography using a conductive resin is formed in stripes (vertical stripes) for each color (R, G, B) including a part of counter electrode 41 on signal line 12. I do. Alternatively, although not shown, each pixel may be formed in an island (dot) shape as in (Embodiment 1) and (Embodiment 2).

Thereafter, as shown in FIG. 8B, the opposite electrode 4 on the signal line 12 between the colored layers 19 is formed by electrodeposition.
1 or a black colored layer 29 containing either or both of a black dye and a pigment is deposited on the signal electrode 12 and the counter electrode 41 of the scanning line 11 around the island-shaped colored layer 19. . Through the above manufacturing steps, the active substrate according to the third embodiment of the present invention is completed.

The active substrate 2 on which the colored layer 19 having the color display function is formed is bonded to the second transparent insulating substrate to form a panel, and an IPS type color liquid crystal panel is completed.

(Embodiment 4) FIG. 9 is a process sectional view of an active substrate according to (Embodiment 4) of the present invention.
7A to 7C and FIG.
As shown in (a) and (b), the steps up to the formation of the colored layer 19 and the black colored layer 29 proceed in the same manufacturing steps as in (Embodiment 3), and subsequently, as shown in FIG. Coloring layer 19
And a relatively thin transparent insulating layer 30 is formed on the black colored layer 29. Thus, the active substrate 2 according to (Embodiment 4) is completed. Then, it is bonded to the second transparent insulating substrate to form a panel, and a color liquid crystal panel is completed.

[0058]

As described above, according to the color liquid crystal panel of the present invention, a colored layer having a color display function is formed with high accuracy on a display region, and a black colored layer having a BM function is formed on a counter electrode with high accuracy. Therefore, the relative position accuracy between the colored layer and the liquid crystal cell is improved and the aperture ratio is improved, and the aperture ratio is not influenced by the bonding accuracy in the panel forming process as in the related art. In addition, since the counter electrode that does not contribute to image display is formed on the scanning line and the signal line, the aperture ratio is further improved. According to the color liquid crystal panel of the present invention, not only a liquid crystal panel having a high aperture ratio is obtained as described above, but also the colored layer and the black colored layer are covered with the transparent insulating layer, so that the colored layer and the black colored layer Elution of impurities from the substrate and emission of gas components are suppressed, and the reliability of the liquid crystal panel is improved. Alternatively, it is not necessary to particularly consider the material purity of the colored layer and the black colored layer, and the material cost is reduced.

Further, according to the color liquid crystal panel of the present invention, not only a liquid crystal panel having a high aperture ratio as described above can be obtained, but also the picture element electrode and the counter electrode are formed on the same surface. The efficiency of the drive voltage applied between the electrodes is improved, and the drive voltage from the external drive circuit can be reduced. That is, power saving is promoted.

Further, according to the color liquid crystal panel of the present invention, not only a liquid crystal panel having a high aperture ratio and improved driving voltage efficiency and low power consumption can be obtained as described above, but also a color layer and a black coloring layer can be obtained. Elution of impurities and release of gas components from the layer are suppressed, and high reliability can be imparted.

According to the method of manufacturing a color liquid crystal panel of the present invention, the black colored layer is formed by electrodeposition, and the thickness of the black colored layer is matched with the thickness of the colored layer, whereby the step between the black colored layer and the colored layer is formed. Is eliminated and the surface of the active substrate is flattened. As a result, the alignment treatment by rubbing is facilitated, and the display quality is improved. In addition, by covering the colored layer and the black colored layer with a transparent insulating layer, elution of impurities and release of gas components from the colored layer and the black colored layer are suppressed, and reliability for use for a long time or in a high temperature state is reduced. A liquid crystal panel having a high level can be obtained.

According to the method of manufacturing a color liquid crystal panel of the present invention, by arranging the pixel electrode and the counter electrode on the same surface, the effective voltage in the horizontal direction between the electrodes is increased, and The driving voltage efficiency is improved, so that a liquid crystal panel with low power consumption can be obtained, and further excellent effects such as a highly reliable liquid crystal panel can be obtained.

As is clear from the above description, the requirement of the present invention is that a thick transparent insulating layer for flattening the surface of the active substrate is formed, and a counter electrode and a coloring layer containing a pigment are formed on the transparent insulating layer. Or forming a colored layer containing a counter electrode, a pixel electrode, and a pigment, and filling the stripe-shaped or dot-shaped colored layers with a black colored layer containing one or both of a dye and a pigment by an electrodeposition method. An IPS color liquid crystal panel in which a surface of a substrate is flattened and a protective film for preventing the emission of impurities and unnecessary gas is formed, wherein a difference in the configuration and material of a switching element such as an insulated gate transistor and an electrode are provided. Needless to say, the present invention includes differences in the configuration and material of the scanning lines and signal lines, which are lines, and differences in the configuration of storage capacitors.

[Brief description of the drawings]

FIG. 1 is a plan view of an active substrate according to a first embodiment of the present invention.

FIG. 2 is a process cross-sectional view of the active substrate according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a final step of the active substrate according to the first embodiment of the present invention;

FIG. 4 is another plan view of the active substrate according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a final step of the active substrate according to the second embodiment of the present invention.

FIG. 6 is a plan view of an active substrate according to a third embodiment of the present invention.

FIG. 7 is a process sectional view of the active substrate according to the third embodiment of the present invention;

FIG. 8 is a process sectional view of the active substrate according to the third embodiment of the present invention after the process.

FIG. 9 is a sectional view of a final step of the active substrate according to the fourth embodiment of the present invention.

FIG. 10 is a perspective view showing a mounting state of a liquid crystal panel.

FIG. 11 is an equivalent circuit diagram of an active liquid crystal panel.

FIG. 12 is a sectional view of a main part of a conventional active liquid crystal panel.

FIG. 13 is a conceptual diagram of an IPS mode liquid crystal cell.

[Explanation of symbols]

 Reference Signs List 2 Active substrate (first transparent insulating substrate) 9 Color filter 19 Coloring layer containing pigment (R, G, B) 23 Drain electrode 26 Semiconductor layer 27 Thick transparent insulating layer 29 Black coloring layer 30 Transparent insulating layer (for protection) 31 Opening formed in transparent insulating layer 41 Counter electrode 42 Pixel electrode

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1343 G02F 1/1335 505 G02F 1/1368

Claims (8)

(57) [Claims] 1. A semiconductor device comprising: a plurality of scanning lines on one main surface; a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers; And at least one of each of an insulated gate transistor, a pixel electrode connected to the drain of the insulated gate transistor, and a counter electrode formed at a predetermined distance from the pixel electrode Having a colored layer containing a pigment on a display area formed by the picture element electrode and the counter electrode.
And a liquid crystal filled between the second transparent insulating substrate and the second transparent insulating substrate, wherein the liquid crystal panel is provided with a thick transparent insulating layer formed on the first transparent insulating substrate. A grid-like counter electrode is formed on at least the scanning line and the signal line, and the colored layer includes a part of the counter electrode on the signal line for each color (R, G, B). It is formed in an island shape including a part of the counter electrode on the signal line and on the scanning line, and is formed on the counter electrode on the signal line between the coloring layers or on the signal line between the coloring layers and the scanning line. A color liquid crystal panel in which a black colored layer containing either or both of a dye and a pigment is formed on the upper counter electrode. 2. A semiconductor device comprising: a plurality of scanning lines on one main surface; a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers; And at least one of each of an insulated gate transistor, a pixel electrode connected to the drain of the insulated gate transistor, and a counter electrode formed at a predetermined distance from the pixel electrode Having a colored layer containing a pigment on a display area formed by the picture element electrode and the counter electrode.
And a liquid crystal filled between the second transparent insulating substrate and the second transparent insulating substrate, wherein the liquid crystal panel is provided with a thick transparent insulating layer formed on the first transparent insulating substrate. A grid-like counter electrode is formed on the scanning line and the signal line, and the colored layer includes a part of the counter electrode on the signal line for each color (R, G, B) in a stripe shape or a signal. It is formed in an island shape including a part of the counter electrode on the line and on the scanning line, and on the counter electrode on the signal line between the colored layers or on the signal line between the colored layers and on the scanning line. A black colored layer containing one or both of a dye and a pigment is formed on the counter electrode,
A color liquid crystal panel having a transparent insulating layer formed on a colored layer and a black colored layer. 3. A semiconductor device comprising: a plurality of scanning lines on one main surface; a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers; And at least one of each of an insulated gate transistor, a pixel electrode connected to the drain of the insulated gate transistor, and a counter electrode formed at a predetermined distance from the pixel electrode Having a colored layer containing a pigment on a display area formed by the picture element electrode and the counter electrode.
And a liquid crystal filled between the second transparent insulating substrate and the second transparent insulating substrate, wherein the liquid crystal panel is provided with a thick transparent insulating layer formed on the first transparent insulating substrate. A grid-like counter electrode is formed at least on the scanning line and the signal line, and a picture element electrode is formed on the display area including the opening above the drain. , B) are formed in a stripe shape including a part of the counter electrode on the signal line or in an island shape including a part of the counter electrode on the signal line and on the scanning line, and the signal between the colored layers is formed. A color liquid crystal panel in which a black colored layer containing either or both of a dye and a pigment is formed on a counter electrode on a line or on a signal line between colored layers and on a counter electrode on a scanning line. 4. A semiconductor device comprising: a plurality of scanning lines on one main surface; a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers; And at least one of each of an insulated gate transistor, a pixel electrode connected to the drain of the insulated gate transistor, and a counter electrode formed at a predetermined distance from the pixel electrode Having a colored layer containing a pigment on a display area formed by the picture element electrode and the counter electrode.
And a liquid crystal filled between the second transparent insulating substrate and the second transparent insulating substrate, wherein the liquid crystal panel is provided with a thick transparent insulating layer formed on the first transparent insulating substrate. A grid-like counter electrode is formed at least on the scanning line and the signal line, and a picture element electrode is formed on the display area including the opening above the drain. , B) are formed in a stripe shape including a part of the counter electrode on the signal line or in an island shape including a part of the counter electrode on the signal line and on the scanning line, and the signal between the colored layers is formed. A black colored layer containing either or both dye or pigment is formed on the counter electrode on the line or on the signal line between the colored layers and on the counter electrode on the scan line;
A color liquid crystal panel having a transparent insulating layer formed on a colored layer and a black colored layer. 5. The method for manufacturing a color liquid crystal panel according to claim 1, wherein an insulated gate transistor is provided on the first transparent insulating substrate.
Forming a pixel electrode connected to the scanning line, the signal line, and the drain of the insulated gate transistor; forming a thick transparent insulating layer on the first transparent insulating substrate; Forming a counter electrode on at least a scanning line and a signal line on the substrate, and striping a colored layer for each color (R, G, B) including a part of the counter electrode on the signal line Forming an island-like shape including a part of the counter electrode on the signal line and on the scanning line, and forming an island shape by electrodeposition on the counter electrode on the signal line between the colored layers or on the signal line between the colored layers. Forming a black colored layer containing either or both of a dye and a pigment on the counter electrode above and above the scanning line. 6. The method of manufacturing a color liquid crystal panel according to claim 2, wherein an insulated gate transistor is provided on the first transparent insulating substrate.
Forming a pixel electrode connected to the scanning line, the signal line, and the drain of the insulated gate transistor; forming a thick transparent insulating layer on the first transparent insulating substrate; Forming a counter electrode on at least a scanning line and a signal line on the substrate, and striping a colored layer for each color (R, G, B) including a part of the counter electrode on the signal line Forming an island-like shape including a part of the counter electrode on the signal line and on the scanning line, and forming an island shape by electrodeposition on the counter electrode on the signal line between the colored layers or on the signal line between the colored layers. Forming a black colored layer containing either or both of a dye and a pigment on the counter electrode above and on the scanning line; and forming a transparent insulating layer on the colored layer and the black colored layer Manufacturing method of color liquid crystal panel. 7. The method of manufacturing a color liquid crystal panel according to claim 3, wherein an insulated gate transistor is provided on the first transparent insulating substrate.
Forming a scanning line and a signal line; forming a thick transparent insulating layer having an opening on the drain of the insulated gate transistor on the first transparent insulating substrate; Forming a counter electrode on at least the scanning line and the signal line, and a pixel electrode including the opening; and forming a colored layer including a part of the counter electrode on the signal line. A step of forming a stripe or an island including a part of the counter electrode on the signal line and the scanning line for each color (R, G, B); Forming a black colored layer containing either or both of a dye and a pigment on the opposing electrode or on the signal line between the colored layers and on the opposing electrode on the scanning line. 8. The method for manufacturing a color liquid crystal panel according to claim 4, wherein an insulated gate transistor is provided on the first transparent insulating substrate.
Forming a scanning line and a signal line; forming a thick transparent insulating layer having an opening on the drain of the insulated gate transistor on the first transparent insulating substrate; Forming a counter electrode on at least the scanning line and the signal line, and a pixel electrode including the opening; and forming a colored layer including a part of the counter electrode on the signal line. A process of forming a stripe shape or an island shape including a part of a counter electrode on a signal line and a scanning line for each color (R, G, B) and opposing on a signal line between colored layers by electrodeposition Forming a black colored layer containing one or both of a dye and a pigment on the electrode or on the signal line between the colored layers and on the counter electrode on the scanning line; and on the colored layer and the black colored layer. Forming a transparent insulating layer.