JPH11142882A - Color liquid crystal panel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the numerical aperture and to obtain the color liquid crystal panel without using a color filter by forming pixel electrodes on top of a coloring layer including a drain electrode and a black color coloring layer. SOLUTION: An optical shield 31 is formed by laminating two kinds of coloring layers 19 on top of the insulated gate type transistor of a first transparent insulating substrate 2. An opening section 32 is formed on the layers 19 on top of the drain electrode of the insulating gate type transistor. The layers 19 include a portion of a signal line 12 and formed in a stripe shape for each of the colors (R, G and B). Moreover, a black color coloring layer 34 is formed on top of the line 12 between the layers 19. Then, transparent and electrically conductive pixel electrodes 14 are formed on top of the layers 19. Then, the active substrate 2, on which the layers 19 having a color display function are formed, is pasted with a second transparent and insulating substrate, on which a transparent and electrically conductive layer is formed on one main surface, to form the color liquid crystal panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal panel having a color image display function 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. Further, one of the two glass substrates constituting the liquid crystal panel has R
By forming the GB colored layer, color display is easily realized. In particular, in a so-called active type liquid crystal panel in which switching elements are built in for each pixel,
An image having little crosstalk, high response speed and 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. 7 shows a state of mounting on a liquid crystal panel, in which a drive signal is supplied to one transparent insulating substrate constituting the liquid crystal panel 1, for example, a scanning line electrode terminal group 6 formed on a glass substrate 2. A COG (Chip-On-Glass) method for directly connecting the semiconductor integrated circuit chip 3 or a TCP film 4 having gold-plated copper foil terminals (not shown) based on, for example, a polyimide resin thin film and a signal line. An electrical signal is supplied to the image display unit by a mounting means such as a TCP system which is fixed to the electrode terminal group 5 by pressing with a suitable adhesive containing a conductive medium. 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 of the liquid crystal panel 1 to the electrode terminals 5 and 6 for the signal lines and the scanning lines, and are necessarily made of the same conductive material as the electrode terminals 5 and 6. No need to be configured. 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,
The gap (gap) is a closed space sealed with a sealing material and a sealing material made of an organic resin at the peripheral portion of the glass substrates 2 and 9, and 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. 8 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. The scanning line 11 and the signal line 12
For example, a TFT (thin film transistor) 10 using amorphous silicon as a semiconductor layer and a silicon nitride layer as a gate insulating layer
Active substrate 2 (one glass substrate) simultaneously with the formation of
Fabricated on

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. With respect to the configuration of the storage capacitor for increasing the time constant of the liquid crystal cell 13, several choices are possible. For example, in FIG. 8, the storage capacitor 17 includes a common electrode 18 and a pixel electrode 14, which 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. 9 is a sectional view of an essential 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 formed on the closed space side of the color filter 9 in correspondence with the pixel electrode 14 by RG.
The three primary colors B are arranged according to a predetermined arrangement.
The counter electrode 15 common to all the pixel electrodes 14 is a colored layer 19
In order to avoid the voltage distribution loss in the liquid crystal cell due to the interposition of the liquid crystal cell, as shown in FIG. 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. 9, 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 also 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.

FIG. 10 is a sectional view of a peripheral portion of the conventional liquid crystal panel 1 on the scanning line side, and shows a state in which the active substrate 2 and the color filter 9 are sealed with an adhesive resin seal 24. The width of the shape of the resin seal 24 is 0.5 to
The height is about 1.2 mm and the height is several μ
m, which is efficiently formed by screen printing on a small liquid crystal panel, and formed so as not to transfer foreign matter using a seal drawing machine on a large liquid crystal panel.

In order to prevent unnecessary light from leaking from the back side when the liquid crystal panel is viewed obliquely around the image display section,
The colored layers 19 'and the BMs 22' are arranged in a predetermined number or more. 25 is a gate insulating layer and 26 is a passivation insulating layer.

The latest liquid crystal panel is designed to have a narrower frame, that is, the area outside the image display unit is designed to be as small as possible to promote the reduction of the weight and size of the display device.
It is also arranged as close to the image display as possible. As a result, the BM 22 'must be arranged on the seal 24.

At the same time, even in a large-sized panel having a diagonal width of 25 cm or more, high definition is simultaneously promoted in order to improve display capacity and display image quality, and as a result, it is required to secure an aperture ratio.
Improving the bonding accuracy of the two glass substrates 2 and 9 constituting the liquid crystal panel at the same time as reducing the BM width has suddenly become a technical problem. Specifically, the pasting accuracy of several μm was sufficient in the past, but in order to increase the aperture ratio to 80% or more, high accuracy of 2 μm or less has come to be 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 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, two glass substrates are attached with an accuracy of 1 to
It is not too difficult to overlap at 2 μm in view of the mechanism and ability of a high-precision exposure machine for large substrates, but the accuracy that can be practically secured due to the warpage of the glass substrate in the curing process of the seal 24 is At present, it is reduced to several μm.

[0018]

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. exists between two glass substrates having a size of 30 cm, a difference in expansion and contraction of 10 to 20 μm occurs. Therefore, gradual heating and gradual cooling are indispensable for heating and cooling in the curing step, but it cannot be reduced too much time to reduce productivity.

Attempts have been made to lower the temperature to 100 ° C. or less in the heat curing of the sealing resin. However, 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.

Regarding the production of color filters, most of the exposure apparatuses used from the viewpoint of cost are of the proximity type, and the total pitch of about 2 μm is the limit of mass production. Has many issues.

[0021]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has various problems associated with the conventional bonding by forming a colored layer having a color display function on an active substrate. It is something you want to do.

In the color liquid crystal panel according to the present invention, a colored layer having an opening on a first transparent insulating substrate and on a drain electrode of an insulated gate transistor formed thereon is provided for each signal line for each color. And a plurality of colored layers are formed on the insulated gate transistor, and one or both of a dye and a pigment are formed on a signal line positioned between the colored layers by an electrodeposition method. Is formed, and an active substrate is formed on which a pixel electrode is formed on the colored layer including the drain electrode and on the black colored layer, including the drain electrode. A second transparent insulating substrate having a layer is filled with liquid crystal therebetween to form a panel.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The liquid crystal panel according to claim 1 is
A plurality of scanning lines are provided on one main surface of the first transparent insulating substrate, and a plurality of signal lines that are substantially orthogonal to the scanning lines via at least one or more insulating layers. An active substrate having at least one insulated gate transistor and a transparent conductive picture element electrode at each intersection with the signal line, and having a colored layer containing a pigment under the picture element electrode; A liquid crystal panel having a transparent conductive layer on the main surface and having a liquid crystal filled between the active substrate and a second transparent insulating substrate facing the active substrate, wherein the liquid crystal panel is provided on the first transparent insulating substrate. A coloring layer having an opening is formed in a stripe shape including a part of the signal line on the drain electrode of the formed insulated gate transistor, and a plurality of coloring layers are formed on the insulated gate transistor. Dye on the signal line between the colored layers Others are black colored layer is formed containing either or both of the pigment, characterized in that the picture element electrode and on the upper and black coloring layer color layer includes a drain electrode are formed.

A liquid crystal panel according to a second aspect has a plurality of scanning lines on one main surface of the first transparent insulating substrate, and is substantially orthogonal to the scanning lines via at least one or more insulating layers. Having at least one insulated gate transistor and a transparent conductive pixel electrode at each intersection of the scanning line and the signal line, and including a pigment under the pixel electrode A liquid crystal panel comprising: an active substrate formed with a layer; and a liquid crystal filled between a second transparent insulating substrate having a transparent conductive layer on one main surface and facing the active substrate. A colored layer having an opening on the drain electrode of the insulated gate transistor formed on the first transparent insulating substrate is formed in a stripe shape including a part of the signal line, and the insulated gate is formed. More than one color on type transistor Is formed, a black coloring layer containing either or both of a dye and a pigment is formed on the signal line between the coloring layers, the opening above the drain electrode is filled with a conductive material, and the conductive material is included. And a picture element electrode is formed on the colored layer and on the black colored layer.

A liquid crystal panel according to a third aspect has a plurality of scanning lines on one main surface of the first transparent insulating substrate, and is substantially orthogonal to the scanning lines via at least one or more insulating layers. Having at least one insulated gate transistor and a transparent conductive pixel electrode at each intersection of the scanning line and the signal line, and including a pigment under the pixel electrode A liquid crystal panel comprising: an active substrate formed with a layer; and a liquid crystal filled between a second transparent insulating substrate having a transparent conductive layer on one main surface and facing the active substrate. Wherein a colored layer having a first opening is formed in a stripe shape including a part of a signal line on a drain electrode of an insulated gate transistor formed on a first transparent insulating substrate. With the insulated gate transistor Is formed on the signal line between the colored layers, a black colored layer containing either or both of the dye and the pigment is formed, and the transparent insulating layer having the second opening on the first opening Is formed on the coloring layer and the black coloring layer, and a pixel electrode is formed on the coloring layer including the drain electrode in the second opening and on the transparent insulating layer on the black coloring layer. It is characterized by the following.

A method for manufacturing a liquid crystal panel according to a fourth aspect is the method for manufacturing a liquid crystal panel according to the first aspect,
Forming a scanning line, a signal line, and an insulated gate transistor on a first transparent insulating substrate; and forming a colored layer having an opening on a drain electrode of the insulated gate transistor and containing a pigment by an insulated gate type. Forming a plurality of colored layers on the transistor in a stripe shape for each color (R, G, B) including a part of the signal line; Step of leaving a photosensitive resin on the terminal electrode of the line, and a step of forming a black colored layer containing either or both of a dye and a pigment on the signal line by electrodeposition, after removing the photosensitive resin, Forming a transparent conductive picture element electrode on the colored layer and the black colored layer including the opening.

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 second aspect,
Forming a scanning line, a signal line, and an insulated gate transistor on a first transparent insulating substrate; and forming a colored layer having an opening and containing a pigment on a drain electrode of the insulated gate transistor by using an insulated gate. Forming stripes for each color (R, G, B) including a part of the signal line so as to form a plurality of colored layers on the type transistor; Leaving the photosensitive resin on the terminal electrode of the signal line, forming a black colored layer containing either or both of the dye and the pigment on the signal line by electrodeposition, and removing the photosensitive resin Thereafter, a step of filling the inside of the opening with a conductive material by electroless plating, and a step of forming a transparent conductive pixel electrode on the colored layer and the black colored layer containing the conductive material. Features.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a liquid crystal panel, comprising the steps of:
Forming a scan line, a signal line, and an insulated gate transistor on a first transparent insulating substrate; and forming a colored layer having a first opening and containing a pigment on a drain electrode of the insulated gate transistor. Forming stripes for each color (R, G, B) including a part of the signal line so as to form a plurality of colored layers on the insulated gate transistor; And a step of leaving a photosensitive resin on the terminal electrodes of the scanning lines and the signal lines, a step of forming a black colored layer containing one or both of a dye and a pigment on the signal lines by electrodeposition, Forming a transparent insulating layer having a second opening on the first opening on the colored layer and the black colored layer after removing the conductive resin; and forming a colored layer including the second opening on the colored layer. A transparent conductive pixel electrode is formed on the transparent insulating layer on the black colored layer. Characterized by a step of. According to the liquid crystal panel of the first aspect, the coloring layer having the color display function is formed under the pixel electrode, and the black coloring layer having the BM function is formed on the signal line with high precision. And a color liquid crystal panel can be obtained without using a color filter.

According to the liquid crystal panel of the second aspect, the opening formed in the coloring layer above the drain electrode is filled with a conductive material and flattened. Electrical contact between the pixel electrode and the drain electrode is ensured.

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 unwanted gas 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 signal line 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 method of manufacturing a liquid crystal panel of the present invention, the opening formed in the coloring layer on the drain electrode is filled with a conductive material and flattened. In addition, restrictions on processing conditions when forming an opening in the colored layer are eased.

According to the liquid crystal panel manufacturing method of the sixth aspect, in addition to the same function as the third aspect, the transparent insulating layer covers the first opening formed in the coloring layer above the drain electrode. Then, since the second opening is formed in the transparent insulating layer to expose the drain electrode, the pixel electrode is less likely to be disconnected, and the electrical contact with the drain electrode is stabilized.

An embodiment of the present invention will be described below with reference to FIGS. Parts having the same functions as those of the conventional example are denoted by the same reference numerals. (Embodiment 1) FIG. 1 shows an active substrate according to (Embodiment 1) of the present invention, and FIGS. 2 (a) to 2 (d) and FIG. 3 (a).
(B), FIG. 4 is a process sectional view taken along line AA ′ of FIG.

In FIG. 1, reference numeral 31 denotes two types of colored layers 1 on an insulated gate transistor of a first transparent insulating substrate 2.
Reference numeral 32 denotes an opening formed in the coloring layer 19 above the drain electrode of the insulated gate transistor, and the coloring layer 19 includes a part of the signal line 12 for each color. (R, G, B) are formed in a stripe shape. Reference numeral 34 denotes a black colored layer formed on the signal line 12 between the colored layers 19. The transparent conductive picture element electrode 14 is formed on these colored layers 19.

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. (Not shown), the scanning line 11, the signal line 12, and the drain electrode 23 are sequentially formed to activate the first transparent insulating substrate 2. 25 is a transparent insulating layer such as a gate insulating layer as described above.

Next, as shown in FIGS. 2B to 2D, a pigment having an opening 32 on the drain electrode 23 is formed by photolithography using a photosensitive resin in which the pigment is dispersed. The colored layer 19 including a part of the signal line 12 for each color (R,
G, B) in the form of stripes (vertical stripes). At this time,
In order to form a light shield that shields the insulated gate transistor 10 from external light, two out of three colors of R, G, and B are used.
A light shield 3 is provided on the insulated gate transistor 10 (not shown) located between the signal line 12 and the drain electrode 23.
It is necessary to laminate the layers 1 while leaving them in an island shape. This is because the coloring layer 19 has a property of transmitting light of a certain wavelength, but when two of them are overlapped, visible light can hardly be transmitted in all combinations. This is because the shield 31 is configured in place of the metal thin film. In FIG. 2B, an R colored layer 19 is formed, in FIG. 2C, a G colored layer 19 is formed next, and in FIG.
In which the colored layer 19 is formed.

After the formation of the striped colored layer 19, FIG.
As shown in (a), the opening 32 above the drain electrode 23 is covered with a photosensitive resin 33 by ordinary photographic etching. At this time, although not shown, it is necessary to leave the photosensitive resin 33 also on the terminal electrode 5 of the signal line 12. Scanning line 11
Since no voltage is applied to the terminal electrodes 6 of the scanning lines 1, there is no necessity.
It is preferable to leave the photosensitive resin 33 on the one terminal electrode 6 as well.

Thereafter, a black colored layer 34 containing one or both of a black dye and a pigment is deposited on the signal line 12 by an electrodeposition method. To do so, all signal lines 12
Must be connected in parallel or in series. An appropriate potential supply point is provided on the periphery of the active substrate 2 and a DC potential is applied to the potential supply point using a jig such as a clip, and the potential is supplied to an appropriate container. Active substrate 2 in electrodeposition liquid
Is immersed in the electrodeposition, but details are omitted here.

The thickness of the black colored layer 34 is made the same as that of the colored layer 19 so that the colored layer 19 and the black colored layer 34 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. FIG. 3B shows a state in which the photosensitive resin 33 on the drain electrode 23 is removed after the formation of the black colored layer 34 and the opening 32 is exposed again.

The last step as an active substrate is shown in FIG.
As shown in (1), a transparent conductive ITO thin film is deposited on the entire surface of the active substrate 2 by using a vacuum film forming apparatus such as sputtering, and colored including the opening 32 above the drain electrode 23 by a fine processing technique. The purpose is to form the pixel electrode 14 on the layer 19 and the black colored layer 34.

The active substrate 2 on which the colored layer 19 having a color display function is formed is thereafter bonded to a second transparent insulating substrate formed on one principal surface of the active substrate 2 to form a panel. The color liquid crystal panel is completed.

(Embodiment 2) FIG. 5 shows a process of an active substrate according to (Embodiment 2) of the present invention. Also in this (Embodiment 2), FIGS. 2A to 2D and FIGS.
As shown in FIG. 5B, the steps up to the formation of the colored layer 19 and the black colored layer 34 proceed in the same manufacturing steps as in the first embodiment, and subsequently, as shown in FIG. The opening 32 formed in the coloring layer 19 on the electrode 23 is filled with a conductive material 35, for example, a metal such as nickel, to a thickness substantially equal to the thickness of the coloring layer 19 and flattened by electroless plating. In general, a negative type is used for the coloring layer 19 containing a pigment, but the cross-sectional shape of the opening 32 formed in the coloring layer 19 by absorption of ultraviolet rays by the pigment tends to have an inverse taper. When the transparent conductive picture element electrode is formed, the picture element electrode 14
Is to prevent disconnection.

Note that the conductive material 35 is also deposited on the terminal electrodes 5 and 6 of the scanning line 11 and the signal line 12 made of a conductive material during electroless plating, but if this is to be avoided, it is removed. Possible resins, such as polyvinyl alcohol (P
VA) may be applied on the terminal electrodes 5 and 6. The terminal electrodes 5 and 6 are located on the periphery of the active substrate 2 as described above, and at least 5 in the case of TCP mounting.
Since it has a size of 0 μm or more, a highly accurate coating method is unnecessary.

After filling the opening 32 with the conductive material 35,
As shown in FIG. 5B, a transparent conductive IT is formed on the entire surface of the active substrate 2 by using a vacuum film forming apparatus such as sputtering.
O thin film is applied and the drain electrode 23 is
The pixel electrode 14 is formed on the colored layer 19 and the black colored layer 34 including the conductive material 35 on the substrate (Embodiment 2)
The active substrate 2 is completed. Then, the transparent conductive layer is later attached to a second transparent insulating substrate formed on one main surface to form a panel, and a color liquid crystal panel is completed.

(Embodiment 3) FIG. 6 shows a process of an active substrate according to (Embodiment 3) of the present invention. Also in (Embodiment 3), FIGS. 2A to 2D and FIG.
As shown in (a) and (b), the steps up to the formation of the colored layer 19 and the black colored layer 34 proceed in the same manufacturing steps as in (Embodiment 1), and subsequently shown in FIG. As described above, the transparent insulating layer 36 is formed on the entire surface of the active substrate 2, and the opening 37 is formed on the drain electrode 23. The transparent insulating layer 36 is made of a photosensitive material, for example, Nippon Synthetic Rubber Co., Ltd.
The use of Optmer PC302 (trade name) made of the transparent insulating layer 36 and the formation of the opening 37 can be performed at the same time, which is reasonable.

The reason why the transparent insulating layer 36 is preferably formed on the colored layer 19 and the black colored layer 34 is, in part, for the reason that undesirable ionic impurities from the black colored layer 34 formed by the electrodeposition method are contained in the liquid crystal. The second is to prevent undesired gas release from the colored layer 19 and the black colored layer 34. These emission components easily dissolve in the liquid crystal and have a side effect of deteriorating the liquid crystal, and this is a matter to be noted particularly in operation at high temperatures. Third, as described above, even if the cross-sectional shape of the opening 32 is an inversely tapered shape, the side surface inside the opening 32 is filled with the transparent insulating layer 36, and the cross-sectional shape is easily tapered.

Although not shown, if the transparent insulating layer 36 is formed thick, for example, with a thickness of 2 to 3 μm, two types of colored layers formed as the light shield 31 of the insulated gate transistor 10 are laminated (R + G, G + B, B + R) 3
This is because the image display portion of the active substrate 2 can be completely flattened by absorbing the generation of the step accompanying 1.

After the formation of the transparent insulating layer 36, as shown in FIG. 6B, a transparent conductive ITO thin film is deposited on the entire surface of the active substrate 2 by using a vacuum film forming apparatus such as sputtering. The picture element electrode 14 is formed on the transparent insulating layer 36 including the opening 37 above the drain electrode 23 by a processing technique, and the active substrate 2 according to the third embodiment is completed. Then, the transparent conductive layer is later attached to a second transparent insulating substrate formed on one main surface to form a panel,
The color liquid crystal panel is completed.

[0050]

As described above, according to the liquid crystal panel of the present invention, a colored layer having a color display function is formed under a pixel electrode, and a black colored layer having a BM function is formed on a signal line with high accuracy. Since it is formed, a color liquid crystal panel having a high aperture ratio can be obtained, and various problems at the time of bonding in a panel forming process using a conventional color filter and an active substrate can be solved.

According to the liquid crystal panel of the present invention, a liquid crystal panel having a high aperture ratio can be obtained in the same manner as described above.
The electrical contact between the pixel electrode and the drain electrode is ensured,
The reliability of the liquid crystal panel is improved.

Further, according to the liquid crystal panel of the present invention, a liquid crystal panel having a high aperture ratio can be obtained in the same manner as described above.
Elution of impurities from the colored layer and the black colored layer and emission of undesired gas are suppressed, and the reliability of the liquid crystal panel, particularly during high-temperature operation, is significantly improved. Further, by forming the transparent insulating layer to be thick, the surface of the active substrate can be flattened, and display quality can be remarkably improved.

According to the liquid crystal panel manufacturing method of the present invention,
Since the black colored layer is formed by electrodeposition, the step between the colored layer and the black colored layer is eliminated, the alignment process is facilitated, and the display quality is improved.

Further, since the opening formed in the coloring layer on the drain electrode is filled with a conductive material and flattened, the processing conditions for forming the opening in the coloring layer are facilitated, and The electrical contact between the electrode and the drain electrode is assured,
The reliability of the liquid crystal panel is improved.

When a transparent insulating layer is formed on the colored layer and the black colored layer, a transparent insulating layer having a second opening above the first opening formed in the colored layer above the drain electrode. A layer is deposited, and the drain electrode is exposed through the second opening. Therefore, even if a pixel electrode is formed on the transparent insulating layer, the pixel electrode is less likely to be disconnected and the pixel electrode and the drain electrode Electrical contact with the liquid crystal panel, and excellent effects such as improvement in the reliability of the liquid crystal panel can be obtained.

As described above, the requirement of the present invention is that the surface of the active substrate is filled with a coloring layer containing a pigment and a black coloring layer containing either or both of a dye and a pigment by an electrodeposition method. This is a color liquid crystal panel in which transparent conductive pixel electrodes are formed on the flattened active substrate surface. Differences due to the configuration and material of switching elements such as insulated gate transistors, and scanning as electrode lines. Needless to say, even if there is a difference depending on the configuration or material of the line or the signal line, the difference is included in the present invention.

[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 the active substrate according to the first embodiment of the present invention after the process.

FIG. 4 is a sectional view of a further subsequent step of the active substrate according to the first embodiment of the present invention;

FIG. 5 is a process sectional view of the active substrate according to the second embodiment of the present invention;

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

FIG. 7 is a perspective view showing a mounted state of a liquid crystal panel.

FIG. 8 is an equivalent circuit diagram of an active liquid crystal panel.

FIG. 9 is a sectional view of a main part of a conventional active liquid crystal panel.

FIG. 10 is a cross-sectional view of a peripheral portion on the scanning line side of a conventional color liquid crystal panel.

[Explanation of symbols]

 2 Active Substrate (First Transparent Insulating Substrate) 9 Color Filter 12 Signal Line 14 Pixel Electrode 19 Colored Layer Containing Pigment (R, G, B) 23 Drain Electrode 31 Light Shield with Two Types of Colored Layers Stacked 32 Opening formed in colored layer 33 Photosensitive resin 34 Black colored layer 35 Conductive material 36 Transparent insulating layer

Claims (6)

[Claims] A first transparent insulating substrate having a plurality of scanning lines on one principal surface thereof, and a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers; Having at least one insulated gate transistor and a transparent conductive pixel electrode at each intersection of the scanning line and the signal line, and having a colored layer containing a pigment under the pixel electrode. What is claimed is: 1. A liquid crystal panel comprising: an active substrate; and a liquid crystal having a transparent conductive layer on one main surface and filled between a second transparent insulating substrate facing the active substrate. A colored layer having an opening on a drain electrode of an insulated gate transistor formed on an insulating substrate is formed in a stripe shape including a part of a signal line, and a plurality of colored layers are formed on the insulated gate transistor. Colored layer is formed, and the signal between the colored layers A color liquid crystal panel in which a black coloring layer containing either or both of a dye and a pigment is formed on a line, and picture element electrodes are formed on the coloring layer including the drain electrode and on the black coloring layer. 2. A semiconductor device comprising: a plurality of scanning lines on one main surface of a first transparent insulating substrate; and a plurality of signal lines substantially orthogonal to the scanning lines via at least one or more insulating layers. Having at least one insulated gate transistor and a transparent conductive pixel electrode at each intersection of the scanning line and the signal line, and having a colored layer containing a pigment under the pixel electrode. What is claimed is: 1. A liquid crystal panel comprising: an active substrate; and a liquid crystal having a transparent conductive layer on one main surface and filled between a second transparent insulating substrate facing the active substrate. A colored layer having an opening on a drain electrode of an insulated gate transistor formed on an insulating substrate is formed in a stripe shape including a part of a signal line, and a plurality of colored layers are formed on the insulated gate transistor. Colored layer is formed, and the signal between the colored layers A black coloring layer containing either or both of a dye and a pigment is formed on the signal line, and the opening above the drain electrode is filled with a conductive material. Color liquid crystal panel with pixel electrodes formed on and above the layer. 3. A first transparent insulating substrate having a plurality of scanning lines on one principal surface thereof, and a plurality of signal lines substantially orthogonal to the scanning lines via at least one insulating layer. Having at least one insulated gate transistor and a transparent conductive pixel electrode at each intersection of the scanning line and the signal line, and having a colored layer containing a pigment under the pixel electrode. What is claimed is: 1. A liquid crystal panel comprising: an active substrate; and a liquid crystal having a transparent conductive layer on one main surface and filled between a second transparent insulating substrate facing the active substrate. A colored layer having a first opening is formed in a stripe shape including a part of a signal line on a drain electrode of an insulated gate transistor formed on an insulating substrate. Is formed with a plurality of colored layers. A black colored layer containing either or both of a dye and a pigment is formed on a signal line between the transparent layer and the transparent layer having a second opening on the first opening. And a pixel electrode formed on the transparent insulating layer on the colored layer including the drain electrode in the second opening and on the black colored layer. 4. A method for manufacturing a liquid crystal panel according to claim 1, wherein: forming a scanning line, a signal line, and an insulated gate transistor on the first transparent insulating substrate; In order to form a plurality of colored layers containing a pigment having an opening on the drain electrode on the insulated gate transistor, a stripe shape is formed for each color (R, G, B) including a part of the signal line. Forming a photosensitive resin over the opening and over the terminal electrodes of the scanning line and the signal line; and including one or both of a dye and a pigment on the signal line by electrodeposition. A step of forming a black colored layer; and a step of forming a transparent conductive picture element electrode on the colored layer and the black colored layer including the opening after removing the photosensitive resin. Production method. 5. The method of manufacturing a liquid crystal panel according to claim 2, wherein: forming a scanning line, a signal line, and an insulated gate transistor on the first transparent insulating substrate; In order to form a plurality of colored layers containing a pigment having an opening on the drain electrode on the insulated gate transistor, a stripe shape is formed for each color (R, G, B) including a part of the signal line. Forming a photosensitive resin on the terminal portion of the opening and the scanning line and the signal line; and coloring the signal line with a dye or a pigment on the signal line by electrodeposition. A step of forming a layer; a step of filling the inside of the opening with a conductive material by electroless plating after removing the photosensitive resin; and a step of forming a transparent conductive layer on the colored layer and the black colored layer containing the conductive material. Form a pixel electrode Method of manufacturing a color liquid crystal panel and a step. 6. A method for manufacturing a liquid crystal panel according to claim 3, wherein: forming a scanning line, a signal line, and an insulated gate transistor on the first transparent insulating substrate; Each of the colors (R, G, B) including a part of the signal line so as to form a plurality of coloring layers containing a pigment having a first opening on the drain electrode and containing a pigment on the insulated gate transistor. Forming a photosensitive resin on the first opening and on the scanning line and the terminal electrode of the signal line; and depositing either a dye or a pigment on the signal line by electrodeposition. Or a step of forming a black colored layer containing both, and after removing the photosensitive resin, forming a transparent insulating layer having a second opening on the first opening on the colored layer and the black colored layer. Forming a colored layer including a second opening and a black layer Method of manufacturing a color liquid crystal panel and a step of forming a transparent conductive pixel electrode on the transparent insulating layer on the color layer.